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Energies
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Analysis and Design of High-Energy-Efficiency Permanent Magnet Machines: 2nd Edition
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Analysis and Design of High-Energy-Efficiency Permanent Magnet Machines: 2nd Edition

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (15 April 2025) | Viewed by 3108

Special Issue Editors

Dr. Xianglin Li

E-Mail Website
Guest Editor
College of Electrical Engineering, Qingdao University, Qingdao, China
Interests: analysis and design of high-efficiency PM machines; high-temperature superconducting machine system; magnetic gear and its transmission system
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yubin Wang

E-Mail Website
Guest Editor
College of New Energy, China University of Petroleum (East China), Qingdao, China
Interests: analysis and design of high-energy-efficiency PM machines; high-temperature superconductivity machine; electromagnetic vibroacoustic analysis of PM machines
Special Issues, Collections and Topics in MDPI journals
Dr. Xinkai Zhu

E-Mail Website
Guest Editor
Department of Electric Engineering, North China Electric Power University, Baoding, China
Interests: design and control of high-efficiency permanent magnet machines; superconducting electrical machine
Special Issues, Collections and Topics in MDPI journals
Dr. Bo Yan

E-Mail Website
Guest Editor
College of Electrical Engineering, Qingdao University, Qingdao, China
Interests: design and modeling of high-performance permanent magnet motor; comprehensive coupling of multi-physical fields in electrical devices
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the increasing development of renewable energy conversion systems, electric vehicles, electrification transportation, electric ship propulsion, traditional motor energy-saving reconstruction, electric aircraft and aerospace, high-energy-efficiency permanent magnet (PM) machines have been in great demand and received increasing attention. Accordingly, the key performance of PM machines, including power density, torque density, efficiency, stability, and reliability, needs to be further improved, and their size, weight, cost, vibration, and noise need to be further reduced to meet the high-performance demand of various applications. In this context, high-energy-efficiency PM machines, such as field-modulation PM machines, PM-assisted synchronous reluctance machines, high-temperature superconducting machines, magnetic gears, etc., are widely studied. Nevertheless, further research on the analysis, design, optimization, and control methods of this kind of high-energy-efficiency machine is still needed.

The aim of this Special Issue is to present and discuss the latest advances in the theory, topology, design, modeling, optimization, and control methods of all kinds of high-energy-efficiency PM machines. Other relevant technologies involving high-performance machines are also encouraged.

Dr. Xianglin Li
Prof. Dr. Yubin Wang
Dr. Xinkai Zhu
Dr. Bo Yan
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

  • new theory of PM machines
  • novel topologies of PM machines
  • optimization design of PM machines
  • modelling of PM machines
  • multiphysical field coupling analysis of PM machines
  • control methods of PM machines
  • loss analysis of PM machines
  • shaft voltage analysis of PM machines
  • thermal and vibroacoustic analysis of PM machines
  • fault diagnosis of PM machines
  • other relevant high-performance machines and techniques

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Related Special Issue

Published Papers (3 papers)

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Research

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16 pages, 6650 KiB  
Article
Analysis and Optimization of a Moving Magnet Permanent Magnet Synchronous Planar Motor with Split Halbach Arrays
by Ronglu Wang, Lu Zhang, Chenyang Shi, Chunqiu Zhao and Kai Yang
Energies 2025, 18(6), 1388; https://doi.org/10.3390/en18061388 - 11 Mar 2025
Viewed by 560
Abstract
This paper investigates an improved permanent magnet synchronous planar motor (PMSPM) featuring a moving magnet configuration to enhance thrust density and positioning accuracy. A novel split Halbach permanent magnet (PM) array is introduced, and the optimization begins with adjusting the pole size ratio [...] Read more.
This paper investigates an improved permanent magnet synchronous planar motor (PMSPM) featuring a moving magnet configuration to enhance thrust density and positioning accuracy. A novel split Halbach permanent magnet (PM) array is introduced, and the optimization begins with adjusting the pole size ratio α, analyzing the flux density distribution, and calculating thrust using an electromagnetic force model. Results demonstrate that the optimized Halbach array reduces thrust fluctuations and improves the uniformity of the air gap magnetic field. Multi-objective optimization using the non-dominated sorting genetic algorithm-II (NSGA-II) fine-tunes auxiliary magnet width and magnetization angles, resulting in a segmented auxiliary permanent magnet structure that achieves a 9.1% improvement in thrust density over conventional designs. Additionally, the optimized Halbach array effectively reduces thrust fluctuations and improves the uniformity of the air gap magnetic field, addressing key challenges in planar motor design. Extensive simulations and experimental validation demonstrate the superior performance of the proposed structure in terms of thrust density and positioning precision. These enhancements make the PMSPM suitable for high-precision, high-dynamic industrial applications. A detailed comparison of motor parameters and thrust performance validates the effectiveness of the proposed structure. Full article
(This article belongs to the Special Issue Analysis and Design of High-Energy-Efficiency Permanent Magnet Machines: 2nd Edition)
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12 pages, 4755 KiB  
Article
Thermal and Mechanical Fields Analysis of Superconducting Magnet and Dewar System for Double-Stator Superconducting Brushless Machines
by Zhiyu Qiu, Zhiheng Zhang, Xianglin Li, Yubin Wang and Wei Hua
Energies 2024, 17(23), 6041; https://doi.org/10.3390/en17236041 - 1 Dec 2024
Cited by 1 | Viewed by 828
Abstract
The double-stator superconducting brushless machine (DS-SCBM) combines high torque density and excellent static sealing characteristics, as well as advantages in reliability and cost-effectiveness. To ensure the long-term stability of the superconducting magnet and Dewar (SCMD) system, this study evaluates the pressure-bearing capacity and [...] Read more.
The double-stator superconducting brushless machine (DS-SCBM) combines high torque density and excellent static sealing characteristics, as well as advantages in reliability and cost-effectiveness. To ensure the long-term stability of the superconducting magnet and Dewar (SCMD) system, this study evaluates the pressure-bearing capacity and heat leakage from the support frame, selecting appropriate materials and dimensions. Furthermore, a model of the thermal and mechanical fields for the SCMD system is developed using finite element analysis which assesses the impact of various reinforcement structures on the mechanical and thermal properties of the superconducting (SC) magnet. Based on this analysis, the dimensions of the reinforcement structures, Dewars, and vacuum interlayer are optimized. Subsequently, efforts are made to manufacture the designed system and its performance is tested. Full article
(This article belongs to the Special Issue Analysis and Design of High-Energy-Efficiency Permanent Magnet Machines: 2nd Edition)
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Review

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15 pages, 4159 KiB  
Review
A Review of Gravity Energy Storage
by Ronglu Wang, Lu Zhang, Chenyang Shi and Chunqiu Zhao
Energies 2025, 18(7), 1812; https://doi.org/10.3390/en18071812 - 3 Apr 2025
Viewed by 1227
Abstract
Gravity energy storage, a technology based on gravitational potential energy conversion, offers advantages including long lifespan, environmental friendliness, and low maintenance costs, demonstrating broad application prospects in renewable energy integration and grid peak regulation. This paper reviews the technical principles, characteristics, and application [...] Read more.
Gravity energy storage, a technology based on gravitational potential energy conversion, offers advantages including long lifespan, environmental friendliness, and low maintenance costs, demonstrating broad application prospects in renewable energy integration and grid peak regulation. This paper reviews the technical principles, characteristics, and application progress of liquid gravity energy storage (LGES), like pumped hydro storage (PHS) and solid gravity energy storage (SGES) systems—tower-based (T-SGES), shaft-type (S-SGES), rail-mounted (R-SGES), and mountain gravity energy storage (M-SGES). PHS, the most mature technology, is widely deployed for large-scale energy storage but faces significant geographical constraints. T-SGES and R-SGES exhibit higher flexibility for diverse terrains, while S-SGES leverage abandoned mines for resource reuse. Despite advantages such as high round-trip efficiency and extended lifecycle, challenges remain in efficiency optimization, high initial investments, and land utilization. Future development of gravity energy storage will require technological innovation, intelligent dispatch systems, and policy support to enhance economic viability and accelerate commercialization. Full article
(This article belongs to the Special Issue Analysis and Design of High-Energy-Efficiency Permanent Magnet Machines: 2nd Edition)
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