Special Issue "Design and Analysis of Electric Machines"

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: 15 July 2020.

Special Issue Editors

Prof. Dr. Hyun-Kyo Jung
Website
Guest Editor
Seoul National University, Seoul, South Korea
Interests: design and analysis of electric machines (Induction motor, permanent-magnet motor, LSM, LIM, LPM, ultrasonic motor, transformers, and etc.); numerical analysis; bioelectromagnetism; analysis of microwave passive devices
Prof. Dr. Sang-Yong Jung
Website
Guest Editor
Sungkyunkwan University, Suwon, South Korea
Interests: optimal design methodology for electric machines; numerical methodology of coupled problem analysis; automated in-house analysis and design program; real-time simulator based on a numerically identified model

Special Issue Information

Dear Colleagues,

Owing to recent technological breakthroughs, electric machines are an important intermediate that transforms primary and renewable energy sources to operate diverse applications. In particular, demand for electric machines with remarkable performance and high efficiency to overcome globally issued regulations on energy efficiency has been increasing remarkably. Therefore, various studies on profound electric machine design and analysis techniques have led to development of innovative machine topology for improved efficiency and machine capability. For these reasons, we are inviting submissions to a Special Issue of Energies, regarding the subject of ‘Design and Analysis of Electric Machines’.

This Special Issue aims to publish recent advancements, technical challenges, and novel design methodologies for electric machine with respect to AC/DC power machines, PM/PM-free machines, and high-torque/speed machines. Herein, classical issues regarding electric machine optimization, electromagnetic analysis, coupled multiphysics analysis, and design overcomes are also appreciated, when the applicant’s unique approach on the issue is included. Furthermore, specialized issues that are relevant to the following topics and others, even if not directly specified, which cover aspects of design and analysis of electric machines, will be welcome as well.

  • Numerical methodologies for electric machine performance;
  • Analysis on electric machine for electromechanical dynamics;
  • Electromagnetic loss identification for enhanced electric machine efficiency;
  • Electric machine modeling with realistic material property;
  • Design optimization associated with multiphysics analysis;
  • Noise, vibration and heat analysis on electric machine;
  • Running behavior of electric machines driven by a new control algorithm.

Applications may cover electric vehicles, robotics, machinery, home appliances, electric aircraft, unmanned propulsion systems, energy conversion systems, etc. Particularly, articles that deal with the latest topics on the new employment of electric machines are much encouraged. We intend to inspire both academic and industrial researchers to present their latest findings on electric machines and associated applications, to provide readers with comprehensive, unbiased, and scientifically sound overview of the most recent research and technological developments.

Prof. Dr. Hyun-Kyo Jung
Prof. Dr. Sang-Yong Jung
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Numerical analysis
  • Electric machine modeling
  • Novel topology
  • Optimal design
  • Magnetic material
  • Electromagnetic loss
  • Mechanical loss
  • Efficiency
  • Coupled analysis
  • Control algorithm
  • NVH(Noise, vibration, and harshness)
  • Thermal field analysis
  • Special machines

Published Papers (6 papers)

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Research

Open AccessArticle
Analysis and Verification of a Wide Input Voltage PWM Converter with Variable Windings
Energies 2020, 13(7), 1634; https://doi.org/10.3390/en13071634 - 02 Apr 2020
Abstract
A three-leg pulse-width modulation converter with auxiliary windings is provided and investigated to realize wide voltage operation and zero voltage switching characteristics on power switches. The presented converter has three converter legs on the input-side and two sets of winding turns on the [...] Read more.
A three-leg pulse-width modulation converter with auxiliary windings is provided and investigated to realize wide voltage operation and zero voltage switching characteristics on power switches. The presented converter has three converter legs on the input-side and two sets of winding turns on the output-side. Owing to the on/off states of the three converter legs and the two sets of secondary winding turns, the proposed converter can be operated under three different equivalent circuits to have wide input voltage operation from 30V ~ 240V (Vin,max = 8Vin,min). Compared with the multi-stage converters to realize wide input voltage operation, the proposed circuit topology has fewer circuit components and a simple control algorithm. Conventional duty cycle control with phase-shift between each converter leg is adopted to regulate load voltage and also accomplish zero voltage switching on active switches. The presented three-leg converter is tested with a laboratory circuit. Finally, experiments testify to the performance and validity of the presented converter. Full article
(This article belongs to the Special Issue Design and Analysis of Electric Machines)
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Open AccessArticle
An Improved LPTN Method for Determining the Maximum Winding Temperature of a U-Core Motor
Energies 2020, 13(7), 1566; https://doi.org/10.3390/en13071566 - 28 Mar 2020
Abstract
In a traditional lumped-parameter thermal network, no distinction is made between the heat and non-heat sources, resulting in both larger heat flux and temperature drop in the uniform heat source. In this paper, an improved lumped-parameter thermal network is proposed to deal with [...] Read more.
In a traditional lumped-parameter thermal network, no distinction is made between the heat and non-heat sources, resulting in both larger heat flux and temperature drop in the uniform heat source. In this paper, an improved lumped-parameter thermal network is proposed to deal with such problems. The innovative aspect of this proposed method is that it considers the influence of heat flux change in the heat source, and then gives a half-resistance theory for the heat source to achieve the temperature drop balance. In addition, the coupling relationship between the boundary temperature and loading position of the heat generator is also added in the lumped-parameter thermal network, so as to amend the loading position and nodes’ temperature through iterations. This approach breaks the limitation of the traditional lumped-parameter thermal network: that the heat generator can only be loaded at the midpoint, which is critical to determining the maximum temperature in asymmetric heat dissipation. By adjusting the location of heat generator and thermal resistances of each branch, the accuracy of temperature prediction is further improved. A simulation and an experiment on a U-core motor show that the improved lumped-parameter thermal network not only achieves higher accuracy than the traditional one, but also determines the loading position of the heat generator well. Full article
(This article belongs to the Special Issue Design and Analysis of Electric Machines)
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Open AccessArticle
± 180° Discontinuous PWM for Single-Phase PWM Converter of High-Speed Railway Propulsion System
Energies 2020, 13(7), 1550; https://doi.org/10.3390/en13071550 - 26 Mar 2020
Abstract
As high-capacity alternating current/direct current (ac/dc) power conversion systems, single-phase pulse-width modulation (PWM) converters used in high-speed railway propulsion systems adopt high-voltage Insulated-Gate Bipolar Transistors (IGBTs) as switching elements. Due to their high breakdown voltage characteristics, the switching dynamics are inferior to those [...] Read more.
As high-capacity alternating current/direct current (ac/dc) power conversion systems, single-phase pulse-width modulation (PWM) converters used in high-speed railway propulsion systems adopt high-voltage Insulated-Gate Bipolar Transistors (IGBTs) as switching elements. Due to their high breakdown voltage characteristics, the switching dynamics are inferior to those of low-voltage IGBTs and switching losses are more dominant than conduction losses despite operating at relatively low switching frequencies of hundreds to several kHz. To solve this problem, this paper proposes ± 180° discontinuous PWM (DPWM) suitable for a single-phase circuit. With the simple addition of offset voltages, the proposed DPWM method can be implemented easily and switching losses can be reduced by half by clamping the switching legs of the H-bridge converter to the positive or negative dc rail during every half cycle. In addition, temperature deviation between the power stacks can be minimized by using selective application of clamping modes. The validity and effectiveness of the proposed DPWM are verified through simulations and experiments of a prototype converter. Full article
(This article belongs to the Special Issue Design and Analysis of Electric Machines)
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Open AccessArticle
Semi-Analytical Modeling and Analysis of Halbach Array
Energies 2020, 13(5), 1252; https://doi.org/10.3390/en13051252 - 08 Mar 2020
Abstract
Analysis of Halbach array placed in open space by using finite element method involves substantial consumption of memory, time, and cost. To address this problem, development of a mathematical modeling and analytic analysis method for Halbach array can be a solution, but research [...] Read more.
Analysis of Halbach array placed in open space by using finite element method involves substantial consumption of memory, time, and cost. To address this problem, development of a mathematical modeling and analytic analysis method for Halbach array can be a solution, but research on this topic is currently insufficient. Therefore, a novel mathematical modeling and analytic analysis method for Halbach array in open space is proposed in this study, which is termed as the Ampere model and the Biot–Savart law (AB method). The proposed AB method can analyze the Halbach array rapidly and accurately with minimal consumption of memory. The usefulness of the AB method in terms of accuracy and memory and time consumption is verified by comparing the AB method with finite element method in this paper. Full article
(This article belongs to the Special Issue Design and Analysis of Electric Machines)
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Open AccessArticle
Modeling and Evaluation of Stator and Rotor Faults for Induction Motors
Energies 2020, 13(1), 133; https://doi.org/10.3390/en13010133 - 26 Dec 2019
Abstract
The modeling of stator and rotor faults is the basis of the development of online monitoring techniques. To obtain reliable stator and rotor fault models, this paper focuses on dynamic modeling of the stator and rotor faults in real-time, which adopts a multiple-coupled-circuit [...] Read more.
The modeling of stator and rotor faults is the basis of the development of online monitoring techniques. To obtain reliable stator and rotor fault models, this paper focuses on dynamic modeling of the stator and rotor faults in real-time, which adopts a multiple-coupled-circuit method by using a winding function approach for inductance calculation. Firstly, the model of the induction machine with a healthy cage is introduced, where a rotor mesh that consists of a few rotor loops and an end ring loop is considered. Then, the stator inter-turn fault model is presented by adding an extra branch with short circuit resistance on the fault part of a stator phase winding. The broken rotor bar fault is then detailed by merging and removing the broken-bar-related loops. Finally, the discrete models under healthy and faulty conditions are developed by using the Tustin transformation for digital implementation. Moreover, the stator and rotor mutual inductances are derived as a function of the rotor position according to the turn and winding functions distribution. Simulations and experiments are performed on a 2.2-kW/380-V/50-Hz three-phase and four-pole induction motor to show the performance of the stator and rotor faults, where the saturation effect is considered in simulations by exploiting the measurements of a no load test. The simulation results are in close agreement with the experimental results. Furthermore, magnitudes of the characteristic frequencies of 2f1 in torque and (1 ± 2s)f1 in current are analyzed to evaluate the stator and rotor fault severity. Both indicate that the stator fault severity is related to the short circuit resistance. Further, the number of shorted turns and the number of continuous broken bars determines the rotor fault severity. Full article
(This article belongs to the Special Issue Design and Analysis of Electric Machines)
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Open AccessArticle
Influence of Manufacturing and Assembly Defects and the Quality of Materials on the Performance of an Axial-Flux Switched Reluctance Machine
Energies 2019, 12(24), 4807; https://doi.org/10.3390/en12244807 - 17 Dec 2019
Cited by 1
Abstract
This paper investigated the influence of manufacturing and assembly defects and the quality of materials on the performance of an axial-flux switched reluctance machine (AFSRM). An AFSRM drive was designed and built for the in-wheel propulsion of an electric scooter. The motor was [...] Read more.
This paper investigated the influence of manufacturing and assembly defects and the quality of materials on the performance of an axial-flux switched reluctance machine (AFSRM). An AFSRM drive was designed and built for the in-wheel propulsion of an electric scooter. The motor was tested according to the standard IEC 60349-Part 1, but the obtained results were below the expected result. The causes of the discrepancy between the simulated and experimental results were analyzed. After an exhaustive study, manufacturing and assembly deficiencies and the quality of materials were identified as the main causes of the mentioned discrepancies. Static torque was used to assess the impact of the different causes in these discrepancies. Finally, some recommendations are proposed to improve the construction of this kind of machine. Full article
(This article belongs to the Special Issue Design and Analysis of Electric Machines)
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