A Review of Recent Trends in High-Efficiency Induction Motor Drives

Mohamed Azab

doi:10.3390/vehicles7010015

Abstract

Induction motor (IM) drives are considered one of the important technologies in modern industry. Several industrial applications, such as material handling and food and beverage applications, are driven and operated by modern AC drives. Moreover, modern electric transportation systems such as EVs and e-trucks are based on AC drives. Recently, high-efficiency IM drive systems have been studied as a major opportunity to reduce energy and fuel consumption. This article addresses the recent trends and advancement in high-efficiency IM drives during a particular period (2017–2024), including the development of high-efficiency motors, the utilization of efficient wide bandgap (WBG) semiconductor devices for inverter topology, and commonly used control strategies to achieve high-performance drives. Moreover, the article addresses several manufacturers of industrial IM drives and the corresponding adopted control techniques in their products. A comparison of these control techniques, including their pros and cons, has been conducted as well.

Keywords:

electric drives; AC drives; induction motor; electric vehicles; EV; efficiency; energy saving; energy efficiency; power electronics; wide bandgap semiconductors; electric motors; field-oriented control; direct torque control; model predictive control; industrial automation; regenerative braking; SDG; sustainable development goals; united nations

1. Introduction

1.1. Market Size of Electrical Drives

The demand for electric drives (EDs) across various industrial sectors and applications is growing. Owing to the latest published reports [1], the global market size for EDs is estimated at USD 25.51 billion in 2024, and is expected to reach USD 32.70 billion by 2029, growing at a compound annual growth rate (CAGR) of 5.10% during the period of 2024 to 2029 [1].

Meanwhile, the global market size of AC drives accounts for an estimated value of USD 17.9 billion in 2022, and is projected to reach USD 25 billion by 2028 at a compound annual growth of 5.7% [2]. Figure 1 and Figure 2 indicate the global market size of electrical drives and AC drives, respectively.

Figure 1. Estimated global market size of electrical drives.

Figure 2. Estimated global market size of AC drives.

1.2. Electric Drives and UN-SDGs

During the last decade, the demand for efficient electric drives (ED) has increased significantly to reduce energy consumption and enhance environmental conservation in accordance with the sustainable development goals (SDGs) of United Nations (UN), and directly linked to SDGs 7, 9, 12, and 13, which are related to energy efficiency, sustainable and clean industries, and climate action to reduce greenhouse gas emissions, respectively. Owing to the latest published reports [3,4], significant acceleration is still needed to meet the target (see Appendix A to recognize the SDGs goals).

Therefore, high-efficiency AC drives play a considerable role in tackling some of the world’s greatest challenges and achieving a sustainable and equitable future. The high-efficiency drives are characterized by minimal energy consumption and significant energy savings, resulting in less fuel consumption and a significant reduction in carbon emissions. These positive consequences support the transition to more sustainable energy use, aligning with the UN-SDGs. The wide spread of these high-efficiency drives promotes the development of more eco-friendly technologies, enhancing energy efficiency across various sectors. As mentioned before, the utilization of high-efficiency electric drives helps mitigate greenhouse gas emissions, contributing to global efforts to limit global warming [5,6].

1.3. Main Contribution

This paper presents a literature summary of the state-of-the art advancements in high-efficiency induction motor drives during a particular period (2017–2024), including high-efficiency electric motors, low power losses power semiconductor devices, and advanced control techniques that essentially contribute to improving the overall AC drive efficiency in accordance with energy efficiency guidelines and standards. In addition, the paper provides a literature summary of recent regenerative braking methods and energy saving algorithms incorporated with the induction motor control system. Moreover, the article provides a list of well-known industrial IM drives produced by several manufacturers, including their adopted control techniques. A comparison has been made between these control techniques, highlighting their pros and cons.

1.4. Elements of a Typical EDS

The generalized block diagram of a typical electric drive system (EDS) is illustrated in Figure 3. A typical EDS is composed of the following elements: mechanical load, electric motor, power source, power electronic converter (power conditioner), control unit, and measuring devices (sensors and transducers).

Figure 3. Block diagram of a typical electric drive system.

Simply, the main objective of an EDS is to drive a mechanical load at any desired speed/position and torque requirements using an electric motor that is fed from a power source through a proper power electronic converter. The high-performance EDS operates in closed-loop mode, such that the motor can run at the desired speed apart from the load variation or any transient variations in the input voltage that feeds the EDS [7].

Practically, the block diagram of the high-efficiency EDS is like the conventional EDS. The major differences between both systems are considered in the following points:

Efficiency classes of the electric motor, where high efficiency and premium efficiency classes are employed;
Types of the power semiconductor devices that form the power electronic converter, where a high-efficiency converter that offers minimum power losses is utilized;
Control techniques, which can involve energy saving algorithms or guarantee operation at optimum flux level for a wide range of motor speeds.

1.5. Factors Affecting Efficiency of IM Drives

The key factors that affect directly the overall efficiency of the IM drives are related mainly to motor design, operating conditions, environmental conditions, periodic checkup rate, and maintenance status. The breakdown of these factors is summarized in Table 1.

Table 1. Key factors affecting overall efficiency of IM drives.

1.6. Power Losses in IM Drives

The previously mentioned factors of Table 1 can be optimized to achieve a high-efficiency AC drive. Practically, the corresponding items of Table 1 contribute to various power losses across the elements of the AC drive, which altogether affects the overall efficiency of the IM drive. Accordingly, the main types of power losses in IM drives can be summarized in the following points:

Copper losses across the motor windings;
Magnetic (iron) losses of the magnetic circuit;
Losses in rotor windings (in wound rotor) or cage losses (in case of squirrel cage);
Iron losses or core losses including hysteresis and eddy currents losses;
Mechanical and bearing losses due to friction;
Stray losses due to leakage flux, magnetic imperfections;
Switching power losses of the inverter;
Conduction power losses of the inverter;
Cooling system losses due to fans (forced air), liquid cooling and heat sink thermal resistance;
Inverter driving circuits power losses;
Snubber circuits and passive filters power losses.

Thus, minimization of all these types of losses by optimum design of the AC motors, utilizing efficient power semiconductor devices, optimizing the drive cooling, and adopting proper control strategy permits considerable energy saving and enhances the overall efficiency of the electric drive system.

1.7. Advancement Directions in IM Drives

The advancement in IM drives has many directions. The major trends include:

Replacement of conventional IM motors by high-efficiency and premium-grade counterparts [8,9];
Utilization of wide bandgap (WBG) semiconductors [10,11];
Implementation of modern control techniques such as: direct torque control (DTC) proposed by authors of [12], model predictive control (MPC) [13], and incorporation of regenerative braking and energy saving algorithms to reduce energy consumption [14,15];
Utilization of efficient high-speed digital signal processors (DSP) as core processors [16], and involvement of hardware in the loop (HIL) data acquisition cards for rapid prototyping and testing purposes [17,18].

Discussions of such directions are presented in Section 2, Section 3, Section 4 and Section 5 as follows: Section 2 provides an overview of the state-of-the-art advancement in high-efficiency induction motors that are commonly used in IM drives. In fact, induction motors are only considered in this article to limit the study and the article length. Section 3 addresses the major trend in high-efficiency power electronic converters based on (WBG) semiconductor devices. Section 4 presents an overview of the advanced control techniques utilized to achieve high-performance IM drives. Section 5 highlights key manufacturers of induction motor drives and the employed control techniques. In addition, some applications of IM drives are addressed in Section 6.

2. High-Efficiency Induction Motors

In general, motor design plays an important role in achieving higher efficiency [19,20]. Several types of AC motors are commonly used and employed in modern electric drive systems. Thus, obtaining high-efficiency AC drives depends on utilization of high-efficiency AC motors. Induction motors (IMs) are considered the most important rotating machines that remain widely used in the modern industry due to their simplicity and reliability.

2.1. Main Features of High-Efficiency IMs

Compared with the standard types of 3-Φ induction motors, whose cross section of their stator is illustrated in Figure 4, and the rotor of squirrel case types, depicted in Figure 5, the high-efficiency counterparts have the following features:

Longer core (motor) length;
Thinner core lamination;
High grade core material such as grain-oriented silicon steel;
Wider stator slots with optimized shapes (based on finite element design and analysis);
Thicker stator windings (larger winding cross section area);
High temperature electrical insulation class;
Larger rotor diameter;
Lower resistance rotor bars such as die cast copper rotor;
Narrower air gap between the stator and rotor;
Larger fan size with optimized aerodynamic;
Larger cooling fins and increase cooling surface area;
Small bearing size with lower friction losses;
Anti-corrosion coating for the motor body.

Figure 4. Cross section of stator of a 3-Φ induction motor.

Figure 5. Rotor of a squirrel cage of a 3-Φ induction motor.

Due to the importance of the topic, several research efforts have been exerted during this decade to improve the performance of IMs in terms of minimizing power losses, improving the starting characteristics, or adopting new approaches for design optimization, such as development of bearingless motors for high-speed applications. Recent improvements in rotor designs and stator winding configurations have led to significant efficiency gains [21,22,23].

2.2. Research Contributions Related to High-Efficiency IMs

A summary of the major research contributions in high-efficiency IMs during the period of 2017–2024 are presented in Table 2, Table 3, Table 4, Table 5 and Table 6. The survey of core contributions includes the following main areas:

Design and manufacturing of high- and premium-efficiency induction motors (Table 2);
Optimization techniques and algorithms for high efficiency motor design (Table 3);
Efforts in bearingless IMs (Table 4);
Modeling, loss analysis, and computational tools (Table 5);
Thermal analysis and cooling systems (Table 6).

Table 2. Research contributions related to design and manufacturing of high-efficiency IMs.

Main Area	Ref.	Core Contribution
Design and Manufacturing of High-Efficiency Motors	[9]	Design of an energy-efficient IM by combining field-circuit and analytical methods; the authors optimized the motor’s core materials and structure to minimize power losses.
	[21,22]	Analyzing and validating different rotor slot geometries to enhance the motor efficiency and starting performance.
	[23]	Motor design and fabrication using amorphous alloy instead of silicon steel, reducing the core and copper losses.
	[24]	Design of a high-performance IM using flat wires and a copper rotor tailored for EVs, demonstrating the feasibility of a rare-earth-free solution that achieves a high-efficiency and thermally stable motor.
	[25]	Designing a six-pole, double-stator–double-rotor axial flux induction motor designed for electric vehicles. The innovative design reduces back iron thickness, leading to a more compact and efficient motor.
	[26]	Developing a low-cost IM with a totally enclosed fan-cooled aluminum cage rotor suitable for EVs.
	[27]	Modifying stator and rotor designs to minimize losses, using low-loss electrical steel and high-conductivity copper to comply with the premium-efficiency class.
	[28]	Analyzing the trade-offs between cost, thermal performance, and efficiency, recommending an optimal Al-Cu mix to achieve IE4 efficiency standards.
	[29]	Investigating the effects of end-ring geometric parameters (thickness, height, and extension) on the starting and rated performance characteristics of IMs.
	[30]	Presenting a methodology for designing energy-efficient induction motors using ANSYS software. Motor parameters are optimized with the aid of FEM.
	[31]	Designing of electric motors and power drive systems in compliance with contemporary efficiency standards. Addresses the importance of integrating efficiency considerations in the early design stage.
	[32]	Analyzing the impact of substituting aluminum with copper in squirrel cage induction motors. Evaluation of electromagnetic and thermal performance, revealing that copper cages enhance efficiency but may affect starting torque. Design guidelines to optimize motor efficiency are also presented.
	[33]	Presenting strategies for induction motor manufacturers to achieve higher efficiency classes in terms of material selection, manufacturing processes and design parameters.
	[34]	Enhancing the efficiency of three-phase squirrel cage induction motor by modifying its cooling system. Suggesting the utilization of aluminum for the stator housing, rotor bars, and end rings to raise the efficiency.
	[35]	Optimizing rotor and stator slot designs of induction motor that is employed for photovoltaic (PV) powered water pumping systems
	[36]	Presenting a design of high-efficiency IM based on modifying the rotor lamination, stack length, and winding configuration while retaining the existing stator lamination.
	[37]	Introducing a stator winding scheme for IMs aimed at reducing magnetomotive force (MMF) distortion. Based on a three-layer winding with varying conductor counts per slot, which has minimized harmonic components in the MMF waveform.
	[38]	Designing a cryogenic induction motor submerged in liquefied natural gas (LNG) for operating LNG spray pumps, operating at −163 °C; the motor’s torque characteristics differ significantly from room temperature conditions. Main design specifications for optimal performance in cryogenic environments have been addressed.
	[39]	Providing a comprehensive overview of the design and control methodologies for improving the energy efficiency of electric machines, including IMs, used in EVs. Also evaluates the impacts of stator and rotor designs, winding configurations, and novel materials on energy efficiency.
	[40]	Investigating the utilization of magnetic slot wedges in IMs with semi-closed slots to enhance efficiency. Various wedge permeabilities and geometries have been studied, demonstrating reductions in copper and core losses.
	[41]	Presenting a methodology to enhance the efficiency of IMs operating at low frequencies by integrating design modifications with control strategies. Motor parameters are optimized by achieving significant energy savings.

Table 3. Research contributions related to optimization techniques for high-efficiency IMs.

Main Area	Ref.	Core Contribution
Optimization Techniques and Algorithms for High-Efficiency Motor Design	[23]	Design optimization via evolutionary algorithms to optimize the stator and rotor slot shapes, achieving a balance between reduced losses and maintained performance
	[25]	Employment of a Monte-Carlo random search algorithm to optimize the motor parameters.
	[26]	Presenting an optimal design and experimental testing of a low-cost, totally enclosed fan-cooled induction machine for city battery electric vehicles. Combines thermal calculations, and finite element analysis (FEA) to enhance the design process by minimizing prototype iterations and ensuring multi-disciplinary performance.
	[28]	Optimizing the motor efficiency by optimal combination of Al-Cu that can meet IE4 standards.
	[29]	Optimizing end-ring thickness to improve starting performance without major changes to existing designs, with a slight trade-off in efficiency, moving from IE4 to IE3 class.
	[42]	Optimizing the motor design via evolutionary algorithms to optimize the stator and rotor slot shapes, achieving a balance between reduced losses and maintained performance. Optimizing motor parameters to enhance efficiency for ceiling fan motors using Taguchi’s Orthogonal Arrays method.
	[43]	Developing a design procedure focused on field-weakening and extended-speed capabilities. The key parameters are EMF and inductance-current product.
	[44]	Development of a hybrid optimization algorithm, combining differential evolution with a non-dominating sorting algorithm, minimizes both the air gap MMF spatial harmonic distortion and the winding resistance, using a hybrid algorithm. The approach yields a winding configuration that reduces copper usage and enhances motor efficiency.
	[45]	Utilization of a machine learning-based approach for diagnosing faults and efficiency optimization in induction motors (IM) for electric vehicle EVs. This approach enables early fault detection, enhances motor reliability, and reduces maintenance costs.
	[46]	Utilization of genetic algorithms to optimize eight key parameters of linear induction motors (LIMs), improving efficiency at rated operating conditions.
	[47]	Introducing a sequential Taguchi method to optimize IM designs for electric vehicles, focusing on various stator slot and rotor bar combinations.
	[48]	Introducing a fractional-order finite element model to analyze the harmonic response of vehicle asynchronous motor rotors. An accelerated response surface optimization method to enhance rotor stiffness and reduce mass is proposed.
	[49]	Assessing various strategies to enhance induction motor efficiency. Impact of design modifications and material selection on the motor performance have been evaluated to achieve higher efficiency of IMs.
	[50]	Introducing a multilayer AC winding configuration for IMs to produce a high-quality magnetomotive force (MMF) with reduced space harmonics for a premium efficiency class machine.
	[51]	Studying the effect of stator slot geometry on the copper losses in high-speed electric machines. Identifying the optimum designs that mitigate skin and proximity effects.
	[52]	Presenting an optimization methodology for the stator and rotor slot design of IMs for EV applications. Utilizing FEM analysis, various slot geometries are investigated to minimize losses and enhance efficiency.
	[53]	Presenting a genetic algorithm-based approach to optimize the design of squirrel cage induction motors, to enhance motor efficiency and minimize costs. Material, mechanical, and performance constraints are incorporated to offer a systematic method to achieve energy-efficient motor designs.
	[54]	Introducing a multi-objective optimization approach for designing high-efficiency induction motors using parameter learning. The objectives terms are efficiency, torque ripple, and power factor.
	[55]	Presenting harmony search algorithm for optimizing the design of three-phase squirrel-cage IMs. The method explores nonlinear design items to enhance motor efficiency.
	[56]	Introducing a multi-objective optimization technique for IM design, utilizing Hill Climbing-based Local Search Optimization (HCLSO). The method iteratively investigates problems such as rotor current, power factor, and efficiency to enhance the motor performance.

Table 4. Research contributions related to development of bearingless IMs.

Main Area	Ref.	Core Contribution
Bearingless IMs	[57]	Proposing a speed sensorless control strategy for bearingless induction motors (BIM) using a modified robust Kalman filter. This method enhances the accuracy of speed estimation and robustness against disturbances.
	[58]	Introducing a direct torque control strategy for bearingless induction motors, employing super-twisting sliding mode control to enhance performance. The employed approach reduces torque and flux ripples and improves robustness against parameter variations.
	[59]	Introducing an enhanced repetitive control strategy to mitigate periodic synchronous rotor vibrations in bearingless induction motors, improving rotor suspension accuracy.
	[60]	Presenting a backstepping control strategy for bearingless induction motors, enhanced by a linear extended state observer (LESO). The utilized approach compensates for the system disturbances, enhancing rotor suspension performance and disturbance rejection.
	[61]	Proposing a fuzzy-enhanced linear active disturbance rejection control (Fuzzy-ELADRC) method for bearingless induction motors. The method combines dynamically adjust control parameters, balancing dynamic performance and robustness. The investigated method improves rotor suspension stability.
	[62]	Providing a multi-objective optimization framework based on evolutionary algorithms to optimize the design of high-speed bearingless induction motors (IMs), aiming to enhance efficiency and power density.
	[63]	Offering systematic design and modeling of a high-performance bearingless induction motor (IM) suitable for medium to high power applications.
	[64]	Developing a rotor radial position control method for bearingless IMs, aimed at enhancing machine stability, reducing mechanical vibration, and controlling rotor eccentricity.
	[65]	Providing a comprehensive review of bearingless motor technology. The paper reviews the motor designs, different topologies, and their performance. It discusses the major limitations in achieving the efficiency and power density for large-scale applications.
	[66]	Proposing a winding design for bearingless motors, enabling a single winding to generate both torque and radial suspension forces. The main feature is separating the terminals for torque and suspension, where the suspension terminals do not contribute a motional electromotive force when the rotor is centered.
	[67]	Investigating a pole-specific rotor design for bearingless induction machines, characterized by a common end-ring to reduce axial length, improving efficiency by preventing suspension field-induced currents.
	[68]	Proposing a three-speed wound bearingless induction motor with a novel winding configuration that enables operation at multiple synchronous speeds. That design enhances the efficiency and stability of the motor.
	[69]	Introducing a speed sensorless control strategy for bearingless induction motors based on an adaptive flux observer. This method improves the rotor suspension performance under various operating conditions.
	[70]	Proposing a driving scheme for three-phase bearingless induction machines with split windings, reducing the required inverter legs from six to four, which decreases the number of drivers, sensors, and current controllers, reducing the overall cost.
	[71]	Providing a comprehensive review of bearingless induction motors, addressing principles of operation, different schemes, and key technologies and challenges.
	[72]	Investigating a model predictive control strategy for direct levitation force control in bearingless induction motors. This approach enhances rotor suspension stability and dynamic response under various operating conditions.
	[73]	Addressing a design framework for bearingless induction motors tailored for industrial compressors. It has a pole-specific rotor winding and a combined stator winding.
	[74]	Suggesting a fuzzy logic controller for the radial position control of a bearingless induction motor, resulting in improved rotor stability and performance.
	[75]	Proposing a driving method for a two-degrees-of-freedom controlled bearingless motor, utilizing a single three-phase inverter. The staggered-tooth stator core design facilitates starting torque production. The method guarantees effective control over both rotational and radial movements.
	[76]	Studying a novel direct torque control method for bearingless induction motors using sliding mode control, incorporating a closed-loop radial suspension force control method based on inverse system theory. A stable suspension operation with reduced torque that enhanced both dynamic response and suspension performance was observed.

Table 5. Research contributions related to modeling, analysis, and computational tools for high-efficiency IMs.

Main Area	Ref.	Core Contribution
Modeling, Loss Analysis and Computational Tools	[24]	Designing a 200 kW induction motor for electric vehicle traction systems, utilizing flat wire windings and a copper rotor. The design improves the slot fill factor. The study provides a comprehensive analysis of material selection and design considerations.
	[25]	Development and validation of a detailed equivalent circuit model for the double-stator–double-rotor configuration using ANSYS Maxwell, providing efficient motor design.
	[28]	Investigating and analyzing the performance of IE4-class IMs with rotor conductors composed of varying aluminum–copper (Al-Cu) ratios. This approach aims to enhance motor efficiency while managing manufacturing costs.
	[44]	Developing a generalized multilayer winding model for symmetrical AC machines, incorporating integer-slot, fractional-slot, and fractional-slot concentrated windings.
	[45]	Development of ML models and simulation of various faults, including Short Circuit (SC), High Resistance Connection (HRC), and Open-Phase Circuit (OPC), and generation of performance data for both healthy and faulty motor conditions under variable load conditions, achieving high accuracy (up to 100%) in identifying motor conditions.
	[46]	Development of an integrated loss model for optimal efficiency control incorporating both motor and inverter losses for enhanced efficiency.
	[62]	Proposing and developing computationally efficient finite element analysis (FEA) methods that allow rapid design performance evaluations, and optimizing the bearingless IM design without excessive computation time.
	[63]	Introducing various finite element analysis (FEA) methods, including a modified transient FEA model, which allow for rapid and accurate performance evaluations.
	[64]	Finite element analysis (FEA) which validates the control approach, demonstrating reliable rotor positioning and reduced eccentricity.
	[77]	Presents a computationally efficient model for analyzing AC winding losses in the stator of traction motors used in high-speed railway units. The model reduces computational demands compared to conventional methods. The model is validated through experimental data and compared with other existing models, demonstrating high accuracy with significantly reduced computational cost. It can help in optimizing motor design to reduce winding losses.
	[78]	Carrying out harmonic and unbalance sensitivity analysis on efficiency motors. It investigates the balance between achieving higher energy efficiency motor and the potential degradation in power quality under nonideal electrical supply conditions.
	[79]	Providing a framework for evaluating the practical and economic impacts of upgrading to high-efficiency electric motors. The study examines the criteria used to assess the feasibility of replacing standard efficiency motors with high-efficiency motors.
	[80]	Proposing a dynamic model for a bearingless induction motor, accounting for rotor eccentricity and load variations. It introduces a modified inductance model and a dynamic air gap function to more accurately depict system behavior, improving the system stability and accuracy of the control system.
	[81]	Introducing a multi-physics model to predict motor performance of axial flux induction motors for EVs. Employs a genetic algorithm-based optimization strategy to enhance efficiency, torque density, and power-to-weight ratio, resulting in better performance and reduced energy consumption in the overall EV.
	[82]	Proposing a machine learning-based method for diagnosing faults in IMs using stator current and vibration signals. This approach enhances diagnostic accuracy.
	[83]	Holding comparison between several IM models that account for iron loss in EVs. Models’ accuracies at different operating conditions have been investigated.
	[84]	Proposing an analytical core loss model for three-phase IMs in an arbitrary reference frame. Accurately predicts core losses under various operating conditions, including transient operation.

Table 6. Research contributions related to thermal analysis and cooling systems for high-efficiency IMs.

Main Area	Ref.	Core Contribution
Thermal Analysis and Cooling Systems	[24]	The study explores two cooling solutions: water jacket with spiral groove and oil spray methods, to manage heat dissipation at high speeds, crucial for maintaining efficiency and component longevity.
	[85,86]	Providing a comprehensive review of thermal management techniques and cooling strategies for high-efficiency IMs. Addresses major thermal challenges, analysis techniques, and evaluate different cooling strategies.
	[87]	Development of a novel oil-cooling design for IMs utilized in EV applications. Addresses the thermal constraints. Demonstrates the importance of thermal management through oil cooling in enhancing motor reliability and lifespan.
	[88]	Addressing the various types of losses in electric machines. Explores various cooling techniques. Emphasizes the importance of temperature distribution analysis and the role of heat management in enhancing machine reliability and operational lifespan.
	[89]	Presenting a thermal analysis method for IMs using a Lumped Parameter Thermal Network model. Accurately predicts motor temperature distribution under varying load conditions, enhancing thermal management and preventing overheating.
	[90]	Providing a thermal analysis of a water-cooled, totally enclosed, non-ventilated IM. Develops a detailed thermal model to evaluate temperature distribution and cooling efficiency. The study highlights the effectiveness of water cooling of IM and enhancing its reliability.
	[91]	Proposing a hybrid thermal management system for IMs, combining air-cooling with an integrated water-cooling mechanism that optimizes motor cooling and improves thermal efficiency. The dual-cooling approach enhances motor reliability, and lifespan.
	[92]	Investigating the impact of cryogenic cooling on the performance of induction motors through experimental assessment. The study highlights cryogenic cooling as a promising approach for high-performance applications.
	[93]	Exploring the heat transfer performance of cooling systems using nanofluids for electric motors. Analyzes the cooling efficiency of nanofluid-based systems. The findings reveal enhanced cooling performance compared to conventional fluids, offering a novel approach to improve motor thermal management.
	[94]	Conducting a thermal analysis of a three-phase IM using Motor-CAD, Flux2D, and MATLAB Ver 13. Integrates electromagnetic and thermal simulations to predict temperature distribution and assess cooling performance. This multi-tool approach enhances motor design accuracy and improves thermal management.
	[95]	Analyzing the thermal behavior of three-phase IM under voltage unbalance and inter-turn short-circuit faults. Investigates the fault-induced heating effects and their impact on the motor performance.
	[96]	Providing a finite element design and thermal analysis of IMs. Develops a thermal model to predict temperature distribution, ensuring optimal motor cooling and enhanced performance. The study provides a design framework for thermally robust IM motors.
	[97]	Proposing a thermal management system for electric motors using L-shaped flat heat pipes. Demonstrates the heat pipes’ effectiveness in dissipating heat, reducing motor temperature and enhancing thermal stability.
	[98]	Providing analysis of end-winding thermal effects in an enclosed fan-cooled induction motor with a die-cast copper rotor. Models heat generation and dissipation in the end-windings, highlighting their impact on motor temperature and performance.
	[99]	Developing a thermal model for IMs with optimized liquid cooling tailored for different electric vehicles (EVs). Assesses cooling performance, reduces motor overheating, and enhances thermal stability under dynamic conditions.
	[100]	Presenting an optimal design methodology for the cooling fan of IMs using experimental validation. Enhances airflow and reduces motor temperature. Provides a systematic approach for fan design.
	[101]	Proposing an optimization method for the design of traction motor cooling system. The integrated thermal modeling and design algorithms enhance motor cooling efficiency.
	[102]	Establishing design criteria and framework for water-cooled systems in IMs. Addresses key parameters such as flow rate and cooling channel geometry. The study optimizes heat dissipation and reduces motor temperature and enhances system reliability.

Moreover, the efficiency ranges of typical premium efficiency IMs, fabricated by key manufacturers for different power ratings, are presented in Table 7.

Table 7. Technical data and efficiency ranges of typical high-efficiency induction motors.

Table 7 summarizes the corresponding efficiency ranges of typical premium efficiency IMs fabricated by different manufacturers [103,104,105,106,107]. For a power rating between 0.75 kW and 22 kW, the corresponding efficiencies are between 82.5% and 93.6%, while for a higher power rating between 30 kW and 110 kW, the corresponding efficiencies are between 93.6% and 95.8%.

3. Wide Bandgap (WBG) Power Semiconductor Devices

The transition from silicon (Si)-based semiconductor devices to wide bandgap (WBG) semiconductors devices is considered one of the most significant advancements in improving the overall efficiency of the power electronic converters [108,109]. Basically, the bandgap is defined as the minimum energy required to excite electrons, transferring the electrons from the valence band to the conduction band.

3.1. Characteristics of WBG Semiconductors

Compared to the conventional Si-based semiconductors, the WBG semiconductors have a larger (wider) bandgap, approximately three times wider. As illustrated in Figure 6, WBG semiconductors (SiC and GaN) have a bandgap between 3.3 eV and 3.4 eV, allowing the WBG power devices to withstand higher voltages (high breakdown voltage) due to the direct correlation between the bandgap and the critical breakdown (electric) field of a semiconductor. As a typical value, the critical electric field of WBGs semiconductors is approximately ten times greater than that of Si semiconductors (0.3 MV/cm in Si, 3.5 MV/cm in SiC, and 3.3 MV/cm in GaN). Consequently, the breakdown voltage in WBG devices is higher than that of conventional Si devices.

Figure 6. Simplified energy diagram and bandgap energy of Si, WBG, and insulators.

However, there are some main differences in several characteristics of SiC and GaN that make each type more convenient and adequate for certain applications over the other; e.g., GaN has higher electron mobility compared with SiC (GaN:1500 cm²/Vs, Sic: 900 cm²/Vs). This means GaN devices are characterized by high switching frequencies, which makes them more suitable for high frequency applications.

Meanwhile, the greater thermal conductivity of SiC devices (5 W/cmK) compared with that of than GaN (1.3 W/cmK) makes SiC devices transfer heat more efficiently, enabling operation at higher temperatures and allowing higher power densities as well. Thus, the distinct characteristics of each type of WBG devices make GaN suitable for low-power and high-frequency applications, while they make SiC suitable for high-power and high-voltage applications [110,111]. Compared to traditional Si-based devices, WBG devices offer superior performance in terms of higher switching frequencies, lower power losses, and high temperature capability. These advantages have permitted their utilization in various applications such as high-performance industrial drives [112,113], electric vehicles (EVs) [114,115], aircraft propulsion [116], and renewable energy applications [117,118]. The utilization of SiC power devices in motor drives can reduce the overall cost of the drive by decreasing the size of passive components [119,120].

3.2. Main Challenges and Design Issues

Compared with the Si power devices, the WBG power devices face some obstacles and challenges that limit their industrial utilization and delay achieving commercial acceptance and full satisfaction. Some of these challenges are:

Higher fabrication and manufacturing cost;
Complex fabrication processes to have the final product with good quality;
Reliability issue for GaN devices at high temperature;
Cooling system design and analysis;
Requirement of proper packaging to alleviate electromagnetic interference (EMI).

Fortunately, the fabrication costs of SiC devices are expected to decline as companies move toward the technology of six-inch wafers [120].

Several design issues are taken into consideration during design and testing of WBG-based power electronic converters to achieve successful and reliable operation [121,122,123,124,125]. The main important design issues that are related directly to the successful and reliable operation of the WBG-based power electronic converter are:

Gate driving signals (voltage levels), which are different from the well-known and commonly used values of Si devices;
The effect of parasitic inductance at operation of high switching frequencies, which requires compact and optimized PCB designs;
EMI and electromagnetic compatibility (EMC) concerns due to high dv/dt and di/dt.

3.3. Research Contributions Related to WBG-Based Converters and AC Drives

A summary of the major research contributions is presented in Table 8, Table 9, Table 10 and Table 11. The survey of core contributions includes the following main areas:

Performance analysis of WBG devices, inverters, and IM drives (Table 8);
System design and performance improvement (Table 9);
Thermal management and cooling systems (Table 10);
Key challenges and solutions (Table 11).

Table 8. Research contributions related to performance analysis of WBG devices and systems.

Main Area	Ref.	Core Contribution
Performance Analysis	[11]	Investigating the effects of high switching speeds and frequencies in wide bandgap (WBG) motor drives on electric machines. Identifies increased motor overvoltage at terminals and stator neutral, leading to higher insulation stress and bearing currents.
	[109]	Proposing a hybrid DC–AC topology combining a Si-IGBT master unit with selective harmonic elimination PWM and a partial-power SiC-MOSFET slave unit. This configuration enhances efficiency, reduces switching loss, and improves power density.
	[110]	Providing comparative analysis of two-level and three-level SiC-based AC drive topologies for efficiency, voltage quality, and common-mode currents. Experimentally evaluates the impact of filters on mitigating high-frequency effects and meeting NEMA standards.
	[111]	Discussing issues such as EMI, high dv/dt, and insulation stress in case of WBG-based AC drives. Also addresses converter design trade-offs of WBG-based AC drives.
	[114]	Quantitative evaluation of energy savings and loss characteristics when replacing Si-IGBTs with SiC MOSFETs in railway traction inverters.
	[115]	Introducing a figure-of-merit (FOM) for comparing 600/650 V SiC and GaN semiconductors employed for EV drives. The paper reveals SiC’s suitability for high-temperature, low-frequency applications and GaN’s efficiency in high-frequency applications.
	[117]	Reviewing the state-of-the-art SiC power devices, including SiC MOSFETs and SiC SBDs, emphasizing their superior characteristics for power electronics applications.
	[118]	The paper introduces a novel integration of SiC devices with high-frequency transformers for high-power renewable energy applications. It designs and validates various DC–DC converter topologies with integrated SiC technology, achieving high efficiency (>98%), reduced size, and improved thermal management.
	[119]	Introducing a variable switching frequency PWM strategy to achieve zero-voltage switching in AC motor drives powered by two parallel SiC inverters. The scheme improves reliability and energy efficiency of AC motor drives.
	[122]	Analyzing the voltage distribution in stator windings of WBG-based inverter-fed motors, highlighting the anti-resonance phenomenon as a critical cause of peak voltage stress near the neutral point.
	[125]	Providing a comprehensive review of hybrid Si/SiC switches, highlighting their potential to combine the advantages of silicon IGBTs and silicon carbide MOSFETs for high-efficiency, high-power-density energy conversion.
	[126]	Addressing a historical overview of silicon carbide (SiC) power devices. Discusses the commercialization of SiC devices and their adoption across various applications, and offers insights into future developments in the field.
	[127]	Presenting an analytical model to predict low-frequency radiated electromagnetic interference (EMI) in three-phase motor drive systems utilizing silicon carbide (SiC) MOSFETs. Models EMI noise sources in the time domain under varying voltage and current conditions, enabling accurate EMI prediction and compliance with EMI standard.
	[128]	Introducing an enhanced method for analyzing parasitic elements in high-performance silicon carbide (SiC) power modules. The study accurately characterizes parasitic impedances, leading to improved design and performance of SiC power modules.
	[129]	Evaluating high-power silicon carbide MOSFET modules against silicon insulated-gate bipolar transistor modules. Highlights SiC MOSFETs’ superior voltage blocking and faster switching capabilities, which enhance efficiency and performance.
	[130]	Presenting a switching loss model for silicon carbide (SiC) power MOSFETs, incorporating parasitic components to predict losses in high-frequency applications. The model validation accounts for the discharge and charge of the output capacitance.
	[131]	Studying and assessing the performance of an advanced neutral-point-clamped (ANPC) converter configuration comprising two SiC MOSFETs and four Si IGBTs per phase leg, focusing on high switching frequency operations.
	[132]	Investigating the integration of wide bandgap (WBG) devices into the DC/DC converters of EVs. A comprehensive model is developed to compare WBG-based converters with traditional silicon counterparts, highlighting performance improvements in EV applications.
	[133]	Examining the efficiency gains of integrating silicon carbide (SiC) MOSFETs into traction inverters for urban e-buses. Evaluates whether these efficiency improvements can offset the higher costs of SiC devices, providing insights into the economic viability of adopting SiC technology in e-transportation. According to the study, significant energy savings can be gained when the vehicle operates mostly in the partial load area.
	[134]	Carrying out a simulation and measurement-based analysis of efficiency improvements achieved by retrofitting a 400 V, 300 kW automotive traction inverter with SiC MOSFETs. The results refer to a considerable reduction in inverter power losses by approximately 50% compared to traditional silicon IGBT-based counterpart.
	[135]	Developing an analytical model to assess voltage distortions in SiC-MOSFET-based inverters for EVs, considering factors like voltage drops, dead time, and switching delays. Experimental results indicate that SiC-based systems exhibit lower voltage distortion and higher efficiency compared to traditional Si IGBT-based scheme.
	[136]	Performance assessment of GaN devices in an e-traction drive system for electric vehicles. The study demonstrates that GaN-based inverters enhance efficiency and dynamic response compared to traditional Si-based inverters.
	[137]	Holding comparison of power and energy losses in three-phase inverters using two SiC-MOSFET modules and one Si (Si-IGBT) module. It considers factors like blanking time and reverse conduction and thermal feedback drive cycles.
	[138]	Providing a comprehensive overview of applying finite element analysis (FEA) to the packaging of SiC power devices, addressing how (FEA) can be utilized to simulate and optimize the thermal, mechanical, and electrical performance of SiC power modules.

Table 9. Research contributions related to system design of WBG-based systems.

Main Area	Ref.	Core Contribution
System Design and Performance Improvement	[108]	Providing a comprehensive review of thermal design strategies for SiC power modules in EV motor drives. It emphasizes innovative heat sink optimization techniques and advanced simulation methods to enhance heat dissipation.
	[112]	Developing a highly integrated dv/dt filter design for silicon carbide (SiC) inverters, combining inductors, capacitors, and damping resistors directly into the bus bars. This approach reduces filter size and weight while maintaining compliance with NEMA standards, providing efficient motor protection against high dv/dt transients and voltage overshoots.
	[113]	Holding comparison of 2L SiC MOSFET and 3L Si IGBT (NPC and T-NPC) inverters for high-speed drives with long cables. Evaluates efficiency, overvoltage, heat sink design, and cost under same conditions. Addresses the trade-offs between SiC’s high efficiency at low power and IGBT’s cost-effectiveness advantage.
	[116]	Design and implementation of a Si/SiC hybrid five-level active neutral point clamped inverter for electric aircraft propulsion. Combines low-frequency Si switches and high-frequency SiC devices. A high-performance hybrid modulation strategy is verified experimentally.
	[121]	Introducing a soft-switching voltage slew-rate profiling approach for SiC-based motor drives to mitigate motor overvoltage caused by the reflected wave phenomenon. By optimizing the rise/fall time of the output voltage to match the cable anti-resonance period, motor overvoltage is eliminated.
	[122]	Developing a multi-conductor transmission line model to identify significant stress near the neutral point. Help mitigate insulation failure by managing anti-resonance effects in motor designs.
	[123]	Providing design and implementation of a 500 kW air-cooled silicon carbide (SiC) three-phase inverter. Achieves a record-breaking power density of 1.246 MW/m³ and efficiency of 98.74%.
	[124]	Introducing a high-efficiency energy conversion system topology for 100 kW DC–DC power conversion using a 3.3 kV SiC device, achieving over 99.7% efficiency.
	[139]	Presenting a compact power module that combines Si IGBTs and SiC MOSFETs. The paper provides detailed gate driver designs and packaging solutions, offering guidelines for application-specific implementations.
	[140]	Addressing the challenge of motor overvoltage oscillations in silicon carbide (SiC)-based motor drives. A quasi-three-level PWM scheme is proposed. This technique allows voltage reflections along the cable to settle before the voltage reaches its final value, eliminating motor overvoltage oscillations in cable-fed drives.
	[141]	Proposing a cost-effective packaging methodology for high-power SiC intelligent power modules (IPMs) by repacking discrete SiC devices, aiming to meet the growing demand for high-current SiC power modules in EV applications.
	[142]	Introducing an optimized dead-time adjustment method for inverters utilizing an enhanced switching model of GaN-High Electron Mobility Transistors, reducing power losses and enhancing inverter efficiency.
	[143]	Presenting a SiC-based battery charger for plug-in EVs. The design attenuates the second order ripple power, enabling the use of smaller DC–link capacitors, reducing the system volume and cost.
	[144]	Investigating a design methodology for inverter-side resistor–inductor (RL) filters aimed at mitigating motor overvoltage in SiC-based drives. The employed approach effectively addresses issues arising from impedance mismatches between inverters and motors.
	[145]	Developing a 10 kV SiC-MOSFET power module. This configuration reduces parasitic inductances and capacitances, leading to a 53% increase in partial discharge inception voltage and a 90% reduction in common-mode current, enhancing high-voltage performance.
	[146]	Presenting a method to achieve zero switching loss in SiC MOSFETs by employing zero-voltage switching (ZVS), thereby minimizing thermal limitations, and enabling operation at higher switching frequencies.
	[147]	Designing a system-level tool that optimizes the power density of three-phase, two-level SiC-based inverters. The developed design tool predicts a 159% power density increase over Si-based inverters.
	[148]	Investigating the integration of (WBG) semiconductor devices, into renewable energy systems and smart grids. Some circuit design requirements to maximize the advantages of (WBG) have been addressed. Moreover, the merits such as efficiency and power density enhancement have been discussed as well.
	[149]	Addressing crosstalk and voltage oscillations in SiC MOSFET half-bridge converters by proposing a gate driver that generates a negative turn-off voltage without a negative power supply. Presents a simple snubber circuit to suppress the parasitic ringing. The findings confirm the effectiveness of the presented solutions to enhance the converter performance.
	[150]	Designing a high-power converter based on an SiC device, reducing conduction losses, and enhances efficiency, which is suitable for applications requiring compact and efficient power conversion solutions.
	[151]	Investigating a half-bridge gate driver circuit for SiC MOSFETs. The topology significantly reduces the total switching power losses by approximately 55% compared to conventional voltage source gate drivers, enhancing the converter efficiency.
	[152]	Introducing an inductor-less dv/dt filter for 100 kW to 1 MW voltage source converters using SiC devices. The design eliminates bulky filter inductors.
	[153]	Presenting a design methodology for dv/dt filters tailored to SiC-based inverters in high-frequency motor-drive systems. Thermal and electrical constraints have been addressed to mitigate insulation stress on motor stator windings caused by high slew rates in line voltages.
	[154]	Exploring the integration of WBG semiconductors, specifically into variable speed drive inverters. Introduces a soft-switching modulation scheme. The study also evaluates low-voltage GaN devices in multi-level inverter structures to enhance overall efficiency.
	[155]	Introducing a high-efficiency, high-power density On Board Chargers (OBCs) based on WBG devices. The design achieves reduced size, and lower electromagnetic interference (EMI), making it suitable for next-generation EV charging systems.
	[156]	Presenting high-performance GaN power transistors characterized by higher breakdown voltage and current density. The design improves the thermal performance and device scalability. Addresses the major limitations of GaN devices.
	[157]	Proposing a variable frequency control strategy and optimized filter design for SiC-based wind inverters. The approach maximizes energy extraction while minimizing switching losses. The method enhances the performance by dynamically adjusting the inverter’s operating frequency.
	[158]	Developing a reduced power losses inverter system using lower harmonic loss technology and ultra-compact inverters using SiC modules. The system reduces harmonic distortion, minimizes power losses, and permits higher power density. The weight of the developed SiC-based inverter has been reduced by 55% of a conventional IGBT inverter.
	[159]	Designing a current–source inverter (CSI)-integrated motor drive utilizing dual-gate four-quadrant (WBG) power switches. This design enables bidirectional power flow, reduced switching losses, and enhanced system efficiency. The approach offers a compact, high-performance solution for next-generation motor drive systems.

Table 10. Research contributions related to cooling systems of WBG-based systems.

Main Area	Ref.	Core Contribution
Thermal Management and Cooling Systems	[160]	Developing a cost-effective, 3D-printed heatsink for rapid prototyping of WBG power converters. The design enables faster development cycles, reduces prototyping costs, and enhances thermal management in industrial and automotive applications.
	[161]	Investigating a cooling system for automotive SiC power modules using a modular manifold with an embedded heat sink. This design improves thermal management, reduces system size, and enhances cooling efficiency.
	[162]	Proposing a cooling system for SiC traction inverters in EVs using heat pipes. This design enhances thermal dissipation, reduces temperature fluctuations, and improves inverter reliability and power density.
	[163]	Investigating cooling techniques and enclosure designs for integrated motor drives (IMDs). Evaluates various cooling methods, including liquid- and air-based systems, to optimize thermal management and enhance drive performance.
	[164]	Carrying out a thermal analysis of housing-cooled integrated motor drives (IMDs). The study examines the heat dissipation performance of housing-based cooling systems, highlighting design factors that improve thermal management. Their approach enables more compact, efficient, and reliable IMD designs.
	[165]	Developing a cooling design tool for EV SiC inverters using transient 3D-CFD simulations. The tool optimizes thermal performance by predicting heat dissipation and fluid flow dynamics. This approach enhances inverter cooling efficiency and reduces system size.
	[166]	Presenting a comprehensive review of cooling concepts and thermal management techniques for automotive WBG inverters. Categorizes cooling topologies, technologies, and integration strategies.
	[167]	Proposing a design methodology of air-cooled SiC inverters employed in EVs, optimizing thermal management, power density. The paper enables compact, efficient, and cost-effective SiC inverters.
	[168]	Presenting an optimal design of an integrated heat pipe air-cooled system for SiC MOSFET converters using the teaching–learning-based optimization algorithm. Their approach enhances thermal performance, minimizes cooling system size, and improves converter efficiency.
	[169]	Presenting an automated methodology for designing and optimizing air-cooled heatsinks for SiC power modules. Integrates genetic algorithms with finite element analysis. Complex heatsink geometries have been generated with this approach. The findings indicate that the size of the optimized heatsink is less than the conventional design approach by 27%; meanwhile, the resultant junction temperature is reduced by 6%.
	[170]	Introducing a thermal management design methodology for SiC power devices and systems using genetic optimization algorithms to achieve optimum geometries for liquid-cooled heat sink. This approach enables the creation of effective complex cooling structures for power electronic systems.
	[171]	Proposing a design optimization method for liquid-cooled heat sinks in WBG power modules, utilizing Fourier analysis and evolutionary multi-objective optimization. The developed heat sinks with this approach outperforms the conventional heat sinks shapes.
	[172]	Presenting a double-sided cooling method for discrete SiC MOSFETs using a press-pack package. This approach enhances thermal dissipation, enabling higher power density and reducing thermal stress. The design achieves improved heat distribution and increased device reliability.
	[173]	Investigating the performance of SiC and GaN devices under cryogenic cooling. The findings indicate that SiC MOSFETs have relatively greater on-state resistance and relatively slower switching speeds at low temperatures, while GaN devices demonstrate improved performance.
	[174]	Investigating a design of a power electronics package that integrates different materials. The design improves thermal cycling reliability of liquid-cooled aluminum SiC heat sinks. The proposed structure and layers minimize the coefficient of thermal expansion mismatch in the stack by 84%, extending the lifetime of the package and permits reduction in the volume and weight.
	[175]	Presenting thermal analysis and material selection methodology for SiC-based Intelligent Power Modules (IPMs). By evaluating various materials and their thermal properties, the study aims to enhance the thermal performance and reliability of SiC IPMs.
	[176]	Designing a thermally uniform heatsink for high-power SiC inverters employed in EVs. A novel heatsink geometry that improves cooling efficiency and thermal uniformity is presented.
	[177]	Investigating a thermal modeling and simulation method for optimizing power density in SiC-MOSFET inverters. The proposed approach allows for optimal placement and design of power modules, optimizing the volume and compactness of the SiC-MOSFET inverter.
	[178]	Proposing an optimal thermal design for SiC power modules. A double-sided cooling strategy to enhance heat dissipation and thermal uniformity is presented. Compact and reliable SiC-based power modules for high-voltage applications can be achieved.
	[179]	Introducing a liquid cooling method for SiC power modules. The proposed method is based on direct liquid contact with the surface of the power module, enhancing thermal dissipation and reducing thermal resistance.
	[180]	Presenting a passive cooling system for high-power SiC power electronic converters. The proposed heat sink enhances heat dissipation and thermal uniformity using phase-change heat transfer. The presented cooling system results in reduced thermal resistance, improving the cooling efficiency.
	[181]	Proposing cooling strategies and thermal management methods for WBG-based current–source inverters (CSIs) employed in motor drives. With the proposed approach, the system compactness is enhanced.
	[182]	Investigating a thermal design methodology for WBG inverters. An optimized cooling structure is proposed. The developed design improves heat dissipation and increases the reliability of WBG inverters.

Table 11. Research contributions related to key challenges and solutions of WBG-based systems.

Main Area	Ref.	Core Contribution
Key Challenges and Solutions	[183]	Presenting a review including key challenges and solutions for GaN power semiconductor modules. Advancements in GaN technology has been addressed. The paper discusses the main challenges such as parasitic effects, and thermal stress. Some proposed solutions have been addressed as well.
	[184,185]	Providing a review on the key advancements, challenges, and future trends in WBG semiconductor technologies for modern automotive and renewable energy systems. Innovations in device design and fabrication technologies have been addressed.
	[186]	Highlighting the superior performance of WBG devices in power electronic converters. Presents some design methodologies and addresses key challenges like parasitic effects and thermal stress.
	[187]	Addressing advancements in WBG devices for the automotive industry. Items such as power density, efficiency, and thermal performance, have been discussed. Moreover, main challenges, including cost, reliability, and integration, are also presented.
	[188]	Discussing the main challenges that affect the reliability and performance of SiC and GaN power semiconductor devices. The article suggests a roadmap for enhancing the quality and reliability of WBG devices for next generation power electronic converters.
	[189]	Reviewing the reliability challenges and packaging of WBG devices. The article provides information about improving the devices’ lifespan and durability for various applications.
	[190]	Investigating the potential of WBG in power electronics. Highlights their superior efficiency, higher switching frequencies, and elevated temperature operation compared to silicon-based devices. Main challenges have been addressed as well.
	[191]	Providing a review of packaging technologies and challenges of SiC power modules, like high-speed switching, thermal management, high-temperature operation, and high-voltage isolation. Discusses emerging issues in soft-switching converters and low-temperature applications of SiC devices.
	[192]	Addressing switching oscillations in WBG semiconductor devices. Classifies oscillation types, analyzes their causes and effects. Suppression techniques have been presented to enhance the performance and reliability of WBG-based power electronic converters.
	[193]	Investigating the integration of CMOS logic with WBG and ultra-WBG semiconductors. The article identifies challenges such as material defects and fabrication complexities. Also presents directions and guidelines to overcome these challenges.
	[194]	Discussing the potential of WBG power semiconductor devices. Presents the International Technology Roadmap for WBG devices, highlighting the challenges and strategies for accelerating adoption and commercial acceptance of WBG-based devices and converters.
	[195]	Addressing advancements in WBG semiconductors. The paper outlines the programs of U.S. Department of Energy that have fostered the innovations through the value chain of power electronics.
	[196]	Presenting the major application of SiC power devices. The article addresses the main obstacles such as the crosstalk effects, current overshoot, and electromagnetic interference. Also presents the possible solutions to alleviate the adverse effects of such obstacles.
	[197]	Providing a review of employment of wide bandgap (WBG) power semiconductor modules in EVs. Main design aspects such as die parallelization and Direct Bonded Copper (DBC) routing have been discussed to enhance efficiency and performance of EV drives.
	[198]	Designing of 30 kVA three-phase SiC-MOSFETs inverter that can operate at ambient temperatures up to 180 °C. Key challenges of operation at such high-temperature have been addressed. The findings prove that SiC-based inverters are feasible in harsh environments.
	[199]	Investigating the obstacles that prevent widespread and adoption of WBG semiconductors in power electronics applications. The main challenges like material defects and high manufacturing costs have been discussed. Some solutions have been addressed to overcome such challenges.
	[200]	Discussing the application and advantages of SiC power devices. The paper discusses challenges and suggest solutions to enhance the performance of SiC devices.
	[201]	Providing a comprehensive review of methods for suppressing conductive common-mode electromagnetic interference in inverter-fed motor drives. The paper also discusses the impact of emerging WBG devices on EMI.
	[202]	Designing an inverter for EV based on double-sided cooled SiC power modules. This method enhances thermal management and increases the power densities, thereby contributing higher reliability and compactness of the inverter.
	[203]	Addressing the characteristics and commercial status of GaN power devices, highlighting their potential for higher frequency and efficiency in power electronic converters compared to conventional Si devices. Also discusses some challenges such as gate driver design, unique reverse conduction behavior, and breakdown mechanisms of the device.

Moreover, state-of-the-art ratings and main manufacturers of SiC-Base MOSFET power transistors, as one of the WBG power semiconductor devices, are summarized in Table 12.

Table 12. Typical ratings and some manufacturers of SiC power MOSFETs.

Owing to Ref. [204], typical state-of-the-art ratings and main manufacturers of SiC power transistors, as one of the WBG power semiconductor devices, are summarized in Table 12.

4. Main Control Techniques of IM Drives

4.1. Introduction

The most used control techniques applied in industrial IM drives are field-oriented control (FOC) and direct torque control (DTC). FOC, originated by Blaschke in [205], is utilized in IM drives when a precise speed and a high dynamic response are required [206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223].

A few decades after inventing FOC, the direct torque control (DTC) technique was proposed by the authors of [12] to provide fast dynamic response and good control of both motor flux and electromagnetic torque [224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239]. The first industrial DTC-based IM drive was designed and fabricated by ABB in 1996, introduced in [240].

On the other hand, many research activities have been conducted recently aiming to employ the finite control set model predictive control (FCS-MPC) approach to regulate motor speed, torque, and flux based on the dynamic model of the IM.

Moreover, for high-efficiency IM drives, the core control algorithms can involve efficiency optimization task/subroutine (function) to minimize the energy consumption by operating at optimum levels of flux and minimizing the reactive component of the current drawn from the AC supply. Also, adopting regenerative braking approach enhances the overall efficiency of the AC drive by returning to the grid the mechanical energy stored in the motor shaft during braking instants.

4.2. Field-Oriented Control

The commonly used and well-known scalar control methods of IMs provide satisfactory steady performance for economic general purpose AC drives. However, they are neither able to provide high transient response, nor are they suitable for precise operation and applications at low and very low speeds. In addition, scalar methods fail to achieve position control of IMs as servo drives. The field-oriented control, or vector control (VC), technique for IM drives was developed to overcome the main limitations of the scalar control methods

The FOC, or VC, technique aims to emulate the decoupled control features of a conventional separately excited DC motor by decomposing the stator current vector into two orthogonal components: direct component I_d and quadrature component I_q. The direct component I_d is responsible for air gap flux production, while the quadrature component I_q is responsible for electromagnetic torque production, as illustrated in Figure 7. This way, the FOC emulates the behavior of the DC motor, which results in high dynamic performance and good transient response under sudden load variations, provided that the machine parameters are identified on-line during the motor operation.

Figure 7. Phasor diagram of stator current components with FOC.

The block diagram of the basic scheme of FOC of IM drives is presented in Figure 8.

Figure 8. Block diagram of the basic scheme of FOC of IM drives.

In the VC or FOC system of 3-Φ IM, the reference electromagnetic torque

T_{e m r e f}^{*}

is computed as the output of the PI-speed controller. The reference stator flux

F_{S r e f}^{*}

is a function of the reference speed, involving the operation in the field weakening mode for motor operation at speeds above the rated value, as illustrated in the lower part of Figure 8.

Meanwhile, the reference stator currents

i_{S d r e f}^{*}

and

i_{S q r e f}^{*}

in the d-q coordinates are generated with the aid of IM parameters owing to the model equations given below:

i_{S d r e f}^{*} = \frac{Φ_{S r e f}^{*}}{L_{S}}

(1)

i_{S q r e f}^{*} = \frac{4}{3} \frac{T_{e m r e f}^{*}}{{P Φ}_{S r e f}^{*}}

(2)

These equations are based on the following assumptions:

1.: The stator flux linkage is typically aligned along the d-axis, and the q-axis flux component is zero. Accordingly: $Φ_{S d}^{*} = Φ_{S r e f}^{*}$ ; $Φ_{S q}^{*} = 0$ ;
2.: The reference stator current in the d-axis is directly related to the stator flux linkage;
3.: The rotor is short circuited, where: $V_{r d} = V_{r d} = 0$ .

The electromagnetic torque is computed using the following equation:

T_{e m} = \frac{3}{2} \frac{P}{2} (Φ_{S d} i_{S q} - Φ_{S q} i_{S d})

(3)

The slip speed is determined using the following relation:

ω_{s l i p} = \frac{R_{r}}{L_{r}} \frac{i_{S q}}{i_{S d}}

(4)

ω_{s} = ω_{s l i p} + ω_{m}

(5)

where

T_{e m}^{*}

is the reference electromagnetic torque (Nm); T_em is the instantaneous electromagnetic torque (Nm);

Φ_{S d}

and

Φ_{S q}

are the stator flux components in d-q synchronous reference frame (Wb); i_Sd and i_Sq are the stator current components of stator current in d-q synchronous frame (A);

ω_{s}

is the synchronous speed (rad/s);

ω_{s l i p}

is the slip speed (rad/s);

ω_{m}

is the motor mechanical speed (rad/s); P is the number of poles; L_s is the stator self-inductance (H); L_r is the rotor self-inductance (H); R_r is the rotor resistance (W); and L_r is the rotor self-inductance (H).

Although the FOC provides good transient performance of the IM, it suffers from several drawbacks. Firstly, the successful operation depends on the accuracy of estimation (computation) of slip speed (

ω_{s l i p}

) and the angle (q), which depend on the rotor time constant (L_r/R_r) that varies with the temperature and level of saturation.

In fact, considerable research efforts have been done in VC and FOC of IM during the period of 1992–2008, with the advancement in DPS and microcontroller technologies. However, the main observed research contributions of FOC of IM drives during the period of 2017 to 2024 are summarized and presented in Table 13.

Table 13. Research contributions in FOC of induction motor drives.

4.3. Direct Torque Control

DTC strategy of IM drives controls directly both stator flux and electromagnetic torque by applying instantaneously the optimum inverter switching state which satisfy both torque and flux requirements. Owing to Figure 9, the DTC scheme of 3-Φ IM is composed of the following blocks:

Motor transient model to calculate the instantaneous value of the stator flux vector and electromagnetic torque.
Two hysteresis ON/OFF controllers: one for the stator flux and the other for the torque.
Optimum switching table whose output is the instantaneous values of the inverter switching state, such that the flux and torque track the set points (reference values).

Figure 9. Block diagram of a conventional DTC system of an IM drive.

The DTC strategy of IM drive can have two modes of operation: torque control mode and speed control mode. In torque control mode, the desired electromagnetic torque is the reference signal. In speed control mode, the reference torque is the output of speed controller. The reference flux signal is a function of the motor reference speed. For speeds greater than the rated value, the reference stator flux is reduced, running the motor in field weakening mode. The flux and torque control under DTC can be explained with the aid of Figure 10 and Figure 11, respectively, where the stator flux vector initially lies in sector number one. Each discrete inverter switching state and the corresponding voltage vector has its effect on both electromagnetic torque and stator flux; e.g., if the voltage vector V₁ is applied during the sampling period, the magnitude of the stator flux will increase. At the same time, the angle between stator and rotor flux vectors will decrease, which results in a reduction in the instantaneous value of the electromagnetic torque. From the principles of electric machines, the magnitude of the electromagnetic torque is directly proportional to the SINE value of the angle between stator and rotor flux vectors.

Figure 10. Stator flux vector lies in Sector 1.

Figure 11. Control of motor stator flux and torque in Sector 1.

Applying vector V₄ instead of V₁ results in a reduction in magnitude of stator flux, as illustrated in Figure 10. At the same time, the angle between stator and rotor flux vectors will increase, which results in an increment in the instantaneous value of the electromagnetic torque. From these observations, an optimum switching table is obtained to control simultaneously both stator flux and electromagnetic torque.

Figure 12 summarizes the effects of all inverter voltage vectors on both torque and flux in Sector 1.

Figure 12. Effects of inverter discrete voltage vectors on stator flux and torque in Sector 1.

The ideal trajectory of the stator flux vector is a circular path. Under DTC strategy, the actual path is formed by applying instantaneously the optimum inverter voltage vectors. Such optimum vectors depend on both the current location of the stator flux vector (Sector number 1:6) and the direction of rotation as well.

Figure 13 clarifies and indicates the selection method of the optimum inverter vectors in Sectors ONE and TWO, where:

For CCW rotation in Sector ONE, vectors V₂ and V₃ are to be mutually applied to follow the desired flux trajectory; while in Sector TWO, vectors V₃ and V₄ are to be mutually applied to follow up the required stator flux trajectory.

For CW rotation in Sector ONE, vectors V₅ and V₆ are to be mutually applied to keep track of the desired flux locus; while in Sector TWO, vectors V₁ and V₆ are to be mutually applied in Sector TWO.

Figure 13. Trajectory of stator flux vector under DTC with conventional two-level VSI.

The stator flux components in the (α–β) stationary reference frame are computed using the following equations:

{\bar{Φ}}_{S} = Φ_{α} + j Φ_{β}

(6)

Φ_{α} = \int_{0}^{T_{S}} (v_{α} - R_{S} i_{α}) d t

(7)

Φ_{β} = \int_{0}^{T_{S}} (v_{β} - R_{S} i_{β}) d t

(8)

where T_S is the sampling period of the DTC algorithm in digital implementation.

The magnitude and the location of the stator flux vector are computed by Equations (9) and (10), respectively. They are inputs to the DTC blocks (hysteresis flux controller and the inverter switching table), as shown in Figure 9.

|Φ_{S}| = \sqrt{Φ_{α}^{2} + Φ_{β}^{2}}

(9)

Ψ_{S} = {t a n}^{- 1} (\frac{Φ_{β}}{Φ_{α}})

(10)

The electromagnetic torque produced by the IM is calculated using Equations (11) and (12):

T_{e m} = \frac{3}{2} \frac{P}{2} ({\bar{Φ}}_{S} x {\bar{I}}_{S})

(11)

T_{e m} = \frac{3}{2} \frac{P}{2} (Φ_{α} i_{β} - Φ_{β} i_{α})

(12)

where P is the number of magnetic poles of the AC motor.

The stator current components in the (α–β) stationary reference frame are determined using Equations (14) and (15):

{\bar{I}}_{S} = i_{α} + j i_{β}

(13)

i_{α} = \frac{1}{3} ({2 i}_{a} - i_{b} - i_{c})

(14)

i_{β} = \frac{1}{\sqrt{3}} (i_{b} - i_{c})

(15)

The major advantages of DTC are the quick response of both torque and flux, as well as dependency of the DTC algorithm on a machine model with a moderate degree of complexity, unlike FOC, which is based on a sophisticated machine mode.

However, the main drawbacks of the DTC are the requirement of online identification of stator resistance to achieve high performance at low speeds, and the conventional scheme is not applicable for position control and servo applications.

In fact, considerable research activities in DTC drives have been carried out during the period of 1997–2017. The main observed research contributions of DTC for IM drives during the period of 2017 to 2024 are summarized and presented in Table 14.

Table 14. Research contributions in DTC technique of induction motor drives.

4.4. Model Predictive Control

Recently, finite control set model predictive control (FCS-MPC) has been applied in IM drives as an advanced control approach [241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256,257] to minimize the torque and flux ripples and achieve other goals, such as minimization of switching frequency.

In the FCS-MPC technique, the future behaviors of the controlled variables (stator flux and electromagnetic torque in case of IM drives) are predicted for a finite time frame of one or more sampling period. Accordingly, the optimum future control action is applied to the motor to satisfy a customized goal function, where the FCS-MPC algorithm repeatedly checks the future behavior at every sampling period. Therefore, in addition to the main speed control (regulation) task, other goals can be achieved, such as minimization of flux and torque ripples, minimization of inverter switching frequency, minimization of stator current ripples, or minimization of active and reactive power ripples. Accordingly, the cost function can accommodate all these terms and more, owing to the performance requirement of the IM drive as demonstrated in Equations (16)–(19):

J_{1} = |T_{e m}^{*} - T_{e m}^{k + 1}| + |Φ_{S}^{*} - Φ_{S}^{k + 1}|

(16)

J_{2} = |T_{e m}^{*} - T_{e m}^{k + 1}| + |Φ_{S}^{*} - Φ_{S}^{k + 1}|

(17)

J_{3} = |i_{S α}^{*} - i_{S α}^{k + 1}| + |i_{S β}^{*} - i_{S β}^{k + 1}|

(18)

J_{p q 1} = |P_{r e f} - P^{k + 1}| + |Q_{r e f} - Q^{k + 1}|

(19)

The absolute value functions of the previous equations can be replaced by square functions for minimizing the terms of the formulated cost functions.

Moreover, each term can have a weight factor (w_p and w_q) to prioritize some term(s) during operation, as given by Equation (20):

J_{p q 2} = {w_{p} (P_{r e f} - P^{k + 1})}^{2} + {w_{q} (Q_{r e f} - Q^{k + 1})}^{2}

(20)

The block diagram of FCS-MPC of IM drives is shown in Figure 14. The control system has three main parts:

Speed control loop and reference signals generation of torque and flux. The output of the PI speed controller represents the desired electromagnetic torque, while the reference stator flux is kept constant at the rated value for the entire range of speed from zero to the rated value. Above the rated value, the flux is reduced inversely to verify field weakening mode.
Computation of stator currents and stator voltages components in the (α–β) stationary reference frame.
FCS-MPC algorithm, which is composed of several blocks and functions, such as prediction of stator currents and stator flux components in the stationary reference frame (α–β) one sample ahead, and prediction of electromagnetic torque one sample ahead as well. Finally, in FCS-MPC, the customized cost function is calculated and checked for all inverter switching states. Then, the optimum inverter switching state that instantaneously provide minimum cost function is chosen and applied to the IM.

Figure 14. Block diagram of FCS-MPC system of IM drive.

The FCS-MPC approach requires a high-speed DSP unit to implement the several functions and subroutines related to the sophisticated algorithm. The accuracy of stator flux and electromagnetic torque prediction depends on the machine parameters plugged into the model. Thus, any deviation from the real values, which are affected by temperature and saturation level of the machine, negatively affects the performance of the IM drive, and maybe the stability as well.

Recently, several research efforts have been exerted in applying and investigating the IM drive under the FCS-MPC approach. The summary of main research contributions during the period of 2017 to 2024 is presented in Table 15.

Table 15. Research contributions of MPC technique of induction motor drives.

In addition, a comparison between these control techniques, including advantages and disadvantages has been made. Table 16 summarizes the pros and cons of these control techniques. Each technique has its own advantages and suffers from some limitations. Therefore, each technique is more convenient in specific applications; e.g., scalar control (SC) is adopted in scalar drives for general purpose applications such as pumping and ventilation purposes, while FOC is utilized in servo applications and high-performance AC drives. DTC is preferred when the industrial process considers the torque as a controlled variable rather than the motor speed. An example of this application is the tension control of wires and paper rolling. Such required operation can be met by using the DTC drive in torque control mode instead of the speed control mode.

Table 16. A comparison between control techniques of IM drives.

Regarding the MPC, the industrial adoption is limited due to the requirement of high computational speeds and the processing capability of the digital control unit. Also, MPC needs an accurate model and is sensitive to motor parameter variations.

4.5. Regenerative Braking and Energy Saving

Applying regenerative braking is one of the important strategies that are employed in industrial AC drives and EVs, because it is an effective and efficient energy recovery technique that minimizes the overall energy consumption and provides quick stopping of the electric machine [258,259,260,261,262,263,264,265,266,267,268,269,270].

In the case of EVs, this energy is utilized to charge the battery, increasing the distance range of the EV. In medium- and high-power ranges, AC drives apply the regenerative braking technique to return the shaft kinetic energy to the electric grid during braking instants, as in electric trains [14,15].

Research contributions in regenerative braking and energy saving of IM drives during the period 2017 to 2024 are presented and summarized in Table 17.

Table 17. Research contributions in regenerative braking and energy saving of IM drives.

5. Manufacturers of Industrial IM Drives

A summary of the well-known industrial AC drive manufacturers (ordered alphabetically) and the employed control techniques in their products are summarized in Table 18. Most manufacturers produce scalar V/F drives and vector control (VC) drives (with position/speed encoder or sensorless drive), while few players adopt DTC technology.

Table 18. Industrial AC drive manufacturers.

The major observation is that MPC has not yet gained industrial acceptance. However, the PowerFlex^® 750 AC drive series, with totalFORCE^® technology from Allen-Bradely provides adaptive control of position, velocity, and torque for AC motors [290,291].

6. Modern Applications of IM Drives

Induction motor drives have been employed in many industrial applications for a long time. Recently, they are utilized in modern applications such as:

Industrial automation and robotics arms;
Electric vehicles, trucks, and buses;
High-speed electric trains;
Energy saving HVAC systems and inverter-based home air conditions;
Drilling rigs in oil and gas industry;
Flywheel energy storage systems;
Electric propulsion systems in marine applications;
Multi-motor conveyor systems;
Hoist and crane control to achieve a safe and high-performance operation in terms of anti-sway, including the possibility of regenerative braking to provide quick stopping.

7. Conclusions

Various modern industries depend on induction motor drives, retaining their importance despite the utilization of synchronous motor drives and other types. This article aims to provide a literature summary of the recent trends in high-efficiency induction motor drives during the period of 2017–2024. In addition, the article addresses recent regenerative braking methods and energy saving algorithms incorporated into the induction motor control system. The article is considered as a review guide to junior researchers whose area of interest are AC drives in general, and induction motor drives in specific. Also, the article can help researchers who are interested in power electronics to recognize the recent advancement in WBG-based converters applied in AC motor control. Accordingly, the paper introduces the state-of-the-art publications related to the topic. The novelty of the paper is considered in the topic itself (high-efficiency IM drives), introducing and addressing the recent core contributions related to the topic.

The selected period is narrowed to only the last seven years to include the state-of-the art research activities that have been carried out. However, considerable respectable research publications covering the same topics have been published during the previous two decades, and the pioneer contributions during the last three decades cannot be ignored and have been addressed through the correspondingly covered topics in the article.

The main conclusions and findings are summarized in the following points:

Development and adoption of high-efficiency AC drives, especially IM drives, is an important opportunity in the modern industry to reduce energy consumption in different sectors, in accordance with energy efficiency standards and restrictions.
Design and implementation of high-efficiency and premium-efficiency IMs have commercial acceptance, as many manufacturers fabricate considerable products covering a wide power range serving multiple applications.
Design of high-efficiency IMs using evolutionary optimization techniques and modern analysis tools such as finite element design has received great interest from academia and industry.
Many recent research papers are interested in studying and investigating thermal equivalent circuits of IMs to optimize and enhance motor cooling system and increase their efficiency.
WBG power semiconductor devices are gradually being incorporated into the development of commercial IM drives due to salient advantages; e.g., SiC devices are suitable for high power applications, while GaN is convenient for low voltage/low power application/very high frequency applications.
Some fabrication challenges of WBG power devices still exist; however, considerable research efforts are tackling these obstacles and finding solutions to most of them. Thus, the prices of WBG devices are decreasing with the time to get commercial acceptance.
The industrial IM drives still depend on scalar control techniques for general purpose application. Meanwhile, vector control IM drives are used when high-performance drives are required.
Until now, few industrial drive manufacturers have adopted or fabricated DTC-based drives since the development of the first drive by ABB in 1996.
MPC have not received commercial or industrial acceptance until recently. However, considerable research papers have adopted and recommended the utilization of FCS-MPC in high-performance IM drives.
Modern IM drives have the option of regenerative braking to provide quick stopping and motor braking. Moreover, regenerative braking participates in a reduction in the overall energy consumption of AC drives. In EVs and electric transportation systems, regenerative braking extends the distance range of the vehicle battery by trickle charging during EV speed reductions and stopping.

Funding

This research received no external funding.

Conflicts of Interest

The author declares no conflicts of interest.

Abbreviations

ASIC	Application specific integrated circuit
BLDC	Brushless DC motor
CAGR	Compound annual growth rate
CCW	Counterclockwise
CW	Clockwise
DAQ	Data acquisition system
DSP	Digital signal processor
DTC	Direct torque control
ED	Electric drives
EDS	Electric drive system
EMC	Electromagnetic compatibility
EMI	Electromagnetic interference
EV	Electric vehicle
FCS-MPC	Finite control set model predictive control
FO	Field orientation
FOC	Field-oriented control
FPGA	Field programmable gate array
GaN	Gallium nitride
HIL	Hardware in the loop
IM	Induction motor
MPC	Model predictive control
PM	Permanent magnet
PWM	Pulse width modulation
PE	Power electronics
RISC	Reduced instruction set computer
SC	Scalar control
SDGs	Sustainable development goals
SRM	Switched reluctance motor
SVM	Space vector modulation
SiC	Silicon carbide
SRM	Switched reluctance motor
THD	Total harmonic distortion
WBG	Wide bandgap
UN	United nations
VC	Vector control
VSI	Voltage source inverter

Appendix A

Appendix A.1. Sustainable Development Goals of the United Nations

Goal 1: End poverty in all its forms everywhere.

Goal 2: End hunger, achieve food security and improved nutrition, and promote sustainable agriculture.

Goal 3: Ensure healthy lives and promote well-being for all at all ages.

Goal 4: Ensure inclusive and equitable quality education and promote lifelong learning opportunities for all.

Goal 5: Achieve gender equality and empower all women and girls.

Goal 6: Ensure availability and sustainable management of water and sanitation for all.

Goal 7: Ensure access to affordable, reliable, sustainable, and modern energy for all.

Goal 8: Promote sustained, inclusive, and sustainable economic growth, full and productive employment, and decent work for all.

Goal 9: Build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation.

Goal 10: Reduce inequality within and among countries.

Goal 11: Make cities and human settlements inclusive, safe, resilient, and sustainable.

Goal 12: Ensure sustainable consumption and production patterns.

Goal 13: Take urgent action to combat climate change and its impacts.

Goal 14: Conserve and sustainably use the oceans, seas, and marine resources for sustainable development.

Goal 15: Protect, restore, and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, halt and reverse land degradation, and halt biodiversity loss.

Goal 16: Promote peaceful and inclusive societies for sustainable development, provide access to justice for all, and build effective, accountable, and inclusive institutions at all levels.

Goal 17: Strengthen the means of implementation and revitalize the Global Partnership for Sustainable Development.

Appendix A.2. Summary of Sustainable Development Goals of the United Nations

No Poverty.
Zero Hunger.
Good Health and Well-Being.
Quality Education.
Gender Equality.
Clean Water and Sanitation.
Affordable and Clean Energy.
Decent Work and Economic Growth.
Industry, Innovation and Infrastructure.
Reduce Inequality.
Sustainable Cities and Communities.
Responsible Consumption and Production.
Climate Action.
Life Below Water.
Life on Land.
Peace, Justice and Strong Institutions.
Partnerships for the Goals

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