Analysis, Control and Design of Permanent Magnet Machines

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Machine Design and Theory".

Deadline for manuscript submissions: 30 April 2025 | Viewed by 596

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Lane Department of Computer Science & Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA
Interests: electromechanical systems; power electronics; linear engine generators
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Dear Colleagues,

Permanent magnets have been around since ancient times, naturally occurring in lodestones. It was not until the eighteenth century that artificial magnets were developed using magnetizing steel. In the 20th century, significant progress was made in the development of permanent magnets, first Alnico (1930s), then ferrite, then Samarium–Cobalt (1970s), and then Neodymium–Iron–Boron magnets (NdFeB) in the 1980s. NdFeB was a breakthrough in magnet technology, providing significantly stronger magnets which enabled their application in higher-power motors and generators. Due to their high efficiency operations and compactness, there has been significant research conducted on these machines. However, there are challenges to overcome such as cost, temperature, demagnetization, and the inability to field weaken, to name a few. Moreover, in traction applications such as electric and hybrid vehicles, even though these motors offer high torque at low speed, they induce significant back electromotive force (back EMF) at higher speeds. These challenges can be overcome by new designs and control algorithms.

This Special Issue will be devoted to the latest research and developments in permanent magnet machines (both motors and generators). We seek submissions related to the design, analysis, modeling, and control of such permanent magnet machines. Manuscripts with real experiments are encouraged.

Prof. Dr. Parviz Famouri
Guest Editor

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Keywords

  • permanent magnet machines
  • PMSM motors
  • generators

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Published Papers (1 paper)

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Research

12 pages, 10470 KiB  
Article
Analysis of Rotor Lamination Sleeve Loss in High-Speed Permanent Magnet Synchronous Motor
by Yiming Tian, Shiqiang Liang, Fukang Wang, Jiahao Tian, Kai Chen and Shi Liu
Machines 2025, 13(3), 236; https://doi.org/10.3390/machines13030236 - 14 Mar 2025
Viewed by 390
Abstract
This study addressed the challenges of excessive eddy current losses and elevated thermal risks to permanent magnets in titanium alloy rotor sleeves for high-speed permanent magnet synchronous motors (HSPMSMs). Focusing on a 10 kW, 30,000 rpm high-speed motor, we innovatively propose incorporating insulating [...] Read more.
This study addressed the challenges of excessive eddy current losses and elevated thermal risks to permanent magnets in titanium alloy rotor sleeves for high-speed permanent magnet synchronous motors (HSPMSMs). Focusing on a 10 kW, 30,000 rpm high-speed motor, we innovatively propose incorporating insulating layers between axially laminated sleeve structures. Current research primarily mitigates eddy currents through the limited axial segmentation of sleeves/permanent magnets or radial shielding layers, while the technical approach of applying insulating coatings between laminated sleeves remains unexplored. This investigation demonstrated that compared with conventional solid sleeves, segmented sleeves, and carbon fibre sleeves, the laminated structure with a coordinated design of aluminium oxide and epoxy resin insulating layers effectively blocked the eddy current paths to achieve a substantial reduction in the sleeve eddy current density. This research concurrently highlights that the dynamic stress response and long-term operational reliability require further experimental validation. Subsequent investigations could explore optimised lamination patterns, parameter matching of insulating layers, and integration with emerging cooling technologies, thereby advancing synergistic breakthroughs in lightweight design and thermal management for high-speed motor rotors. Full article
(This article belongs to the Special Issue Analysis, Control and Design of Permanent Magnet Machines)
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