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Energies
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Theory, Control and Applications of Electric Machines and Drives
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Theory, Control and Applications of Electric Machines and Drives

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F3: Power Electronics".

Deadline for manuscript submissions: closed (19 June 2023) | Viewed by 6479

Special Issue Editors

Dr. Yu Wang

E-Mail Website
Guest Editor
Department of Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Interests: direct torque control; hybrid excitation machines; bearingless machines
Dr. Qian Chen

E-Mail Website
Guest Editor
School of Electrical and Information Engineering, Jiangsu University 212013, Zhenjiang, China
Interests: electric machine design; modeling; fault analysis; intelligent control
Dr. Hui Yang

grade E-Mail Website
Guest Editor
School of Electrical Engineering, Southeast University, Nanjing 210096, China
Interests: new energy vehicles; wind power generation; robot servo and other applications; novel permanent magnet machines and drives; permanent magnet motors; dynamic modeling; design optimization theory; coordinated control of drive and magnetic modulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The progress made in electric machines and drive systems has had a tremendous impact on industry applications, leading to more electric aircraft, electric vehicles, and wind power generation. In recent years, the research and development of flux modulation theory has promoted the derivation, classification, and unification of machine topology. The development of machine control technologies, including advanced torque/force control, fault-tolerant control and position sensorless control, has improved the control capability, fault-tolerance, and integration of drive systems, respectively. In addition, special applications such as medical pumps put forward higher requirements for special machines and drive systems.

This Special Issue aims to present and disseminate the most recent advances related to the theory, control, and application of electric machines and drives.

Topics of interest for publication include, but are not limited to:

  • Flux modulation theory of electric machines;
  • Novel topologies of Flux modulation machines;
  • Novel torque control of electric machines;
  • Sensorless control of electric machines;
  • Fault-tolerant machines;
  • Hybrid excitation machines;
  • Memory machines;
  • High-speed machines;
  • Bearingless machines.

Dr. Yu Wang
Dr. Qian Chen
Dr. Hui Yang
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 submissions that pass pre-check are 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 2600 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

  • Flux modulation
  • Torque control
  • Sensorless control
  • Fault tolerance
  • Hybrid excitation
  • Memory machines
  • Special electrical machines

Published Papers (4 papers)

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Research

27 pages, 8624 KiB  
Article
Methods for Reducing Cogging Force in Permanent Magnet Machines: A Review
by Wenjuan Hao, Gong Zhang, Wenbo Liu, Hui Liu and Yu Wang
Energies 2023, 16(1), 422; https://doi.org/10.3390/en16010422 - 29 Dec 2022
Cited by 5 | Viewed by 2331
Abstract
Permanent magnet (PM) machines inevitably suffer from cogging force, which does not contribute to the average output torque (force) but contributes as a type of torque (force) ripple. This paper provides an overview of the cogging force reduction methods for different types of [...] Read more.
Permanent magnet (PM) machines inevitably suffer from cogging force, which does not contribute to the average output torque (force) but contributes as a type of torque (force) ripple. This paper provides an overview of the cogging force reduction methods for different types of PM machines. First, a systematic and comprehensive categorization of different kinds of cogging force reduction methods is given according to the reduction principle. Then, the cogging force reduction methods for different types of PM machines are analyzed and discussed based on the categorization. Finally, according to the versatility and feasibility of the cogging force reduction methods, practical methods are recommended for different types of PM machines. The categorization, analyses, and recommendations presented in the paper are useful for the design of different types of PM machines with the requirement of cogging force reduction or output torque (force) ripple suppression. Full article
(This article belongs to the Special Issue Theory, Control and Applications of Electric Machines and Drives)
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19 pages, 8609 KiB  
Article
Design and Analysis of a Series-Type Permanent Magnet Axial Flux-Switching Memory Machine
by Nian Li, Da Xu, Xiangjun Hao and Jianhui Li
Energies 2022, 15(23), 8954; https://doi.org/10.3390/en15238954 - 26 Nov 2022
Viewed by 1127
Abstract
This paper presents a new topology of an axial flux-switching memory machine with series-type permanent magnets (SPMs) to improve the flux regulation capability. The key idea was to combine low coercive force (LCF) PMs, which can be magnetized and demagnetized readily, with high [...] Read more.
This paper presents a new topology of an axial flux-switching memory machine with series-type permanent magnets (SPMs) to improve the flux regulation capability. The key idea was to combine low coercive force (LCF) PMs, which can be magnetized and demagnetized readily, with high coercive force (HCF) PMs in series to provide a variable air-gap magnetic flux. The flux regulating principle and the forward magnetization effect of HCF PMs on LCF PMs are presented and discussed. Based on 3D finite element analysis (FEA), the magnetization variation of LCF PMs and the electromagnetic performances of the machine under different magnetization states were investigated. Simulation results showed that the air-gap magnetic flux could be weakened by up to 45% by using a magnetization current impulse, significantly extending the PM motor’s flux-weakening speed range. Finally, a prototype machine was built, and experiments were performed to validate the predictions. The basic experimental validation shows that the measured back-EMF and the flux regulating characteristic matched the 3D FEA results well. Full article
(This article belongs to the Special Issue Theory, Control and Applications of Electric Machines and Drives)
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15 pages, 6024 KiB  
Article
Speed Range Extension of Dual-Stator PM Machine Using Multi-Mode Winding Switching Strategy
by Shukang Lyu, Hui Yang, Heyun Lin, Hanlin Zhan and Chaohui Liu
Energies 2022, 15(18), 6561; https://doi.org/10.3390/en15186561 - 8 Sep 2022
Viewed by 1145
Abstract
In this paper, a novel winding switching (WS) strategy is proposed for the speed range extension of a dual-stator permanent magnet machine (DS-PMM), which can achieve simple and effective dynamic mode conversion over an entire operating region. Two types of WS circuits with [...] Read more.
In this paper, a novel winding switching (WS) strategy is proposed for the speed range extension of a dual-stator permanent magnet machine (DS-PMM), which can achieve simple and effective dynamic mode conversion over an entire operating region. Two types of WS circuits with an inverter and two switch groups were first designed to enable the winding reconfiguration of the machine, which could operate in three modes. The WS principle was then elucidated by introducing simplified equivalent circuits. Besides, the torque–speed curves of the machine under different operating modes were analyzed, based on the mathematical model. A speed-based WS controller was, subsequently, designed to generate the WS control signal and realize the multi-mode operation according to real-time operating conditions. The feasibility of the proposed WS strategy for extending the speed range of the DS-PMM was, finally, verified by experiments. Full article
(This article belongs to the Special Issue Theory, Control and Applications of Electric Machines and Drives)
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15 pages, 5220 KiB  
Article
A New Spoke PM Motor with ECC ASPs to Reduce Flux Density Harmonics
by Gaohong Xu, Tang Tang, Qian Chen and Zexin Jia
Energies 2022, 15(17), 6184; https://doi.org/10.3390/en15176184 - 25 Aug 2022
Cited by 1 | Viewed by 1135
Abstract
This paper proposes new eccentric (ECC) auxiliary salient poles (ASPs) applied in spoke permanent-magnet (PM) motors. These ECC ASPs optimize flux density harmonics and further reduce torque pulsation. Then, the optimization procedure is proposed to reveal the relationship between the ECC method and [...] Read more.
This paper proposes new eccentric (ECC) auxiliary salient poles (ASPs) applied in spoke permanent-magnet (PM) motors. These ECC ASPs optimize flux density harmonics and further reduce torque pulsation. Then, the optimization procedure is proposed to reveal the relationship between the ECC method and ASP, and optimization steps are reduced. Firstly, the design of the ECC ASPs is based on the stairs, which are equivalent to sinusoidal flux density. Second, the expressions of offset length for maximum air gap, pole arc angle, and thickness ratio are revealed. Through theoretical analysis and the finite element method (FEM), the proposed ECC ASPs can generate low torque pulsation and improve sound and vibration features. Full article
(This article belongs to the Special Issue Theory, Control and Applications of Electric Machines and Drives)
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