Rare-Earth-Free Permanent Magnet Motors and Generators for Use in Electric Vehicles and Wind Turbines

Dear Colleagues,

The energy and transportation industries focus on combating climate change and conserving energy. There have been significant advancements in electric vehicle and wind turbine technologies to speed up their efforts. However, the widespread adoption of electric machines requires affordable and high-energy efficient electric motors and generators. Additionally, there is a need for stable supply chains of rare-earth (RE) minerals, which are used to produce permanent magnets. In response to the growing demand for electric mobility, permanent magnet synchronous motors (PMSM) and permanent magnet-assisted synchronous reluctance motors (PMASyncRM) have been developed.

The use of RE magnets in electric motors for electric vehicles (EVs) and in the generators of wind turbines is widespread. However, the unstable supply chain of RE minerals results in high costs for RE magnets, geopolitical complications, and significant environmental and health risks associated with mining these minerals. These issues require urgent attention.

This Special Issue will cover recent and innovative research trends in electric machines designed based on RE-free permanent magnets, addressing the urgent issues mentioned above. We encourage authors to submit original research and review articles focusing on theoretical and experimental electric machine design and interpretation of the machine’s performance.

This special issue is relevant to one of Magnetism Journal’s scopes: Electrical Machines and Power Transformers and Inductors.

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

• Rare-earth (RE)-free permanent and soft magnets for electric machine applications.
• Working principles of permanent magnet synchronous motor (PMSM).
• AI-based design of high-torque density and low-torque ripple RE-free PMSM.
• AI-based design of RE-free permanent magnet-assisted synchronous reluctance machine (PMASynRM).
• AI-based design of energy-shifting PMSM.
• Electromagnetic characteristics of spoke-type PMSM.
• Copper and iron losses in spoke-type PMSM and PMASyncRM.
• Consumption of magnetic materials for rotor of spoke-type PMSM and PMASynRM.
• Motor controllers and control circuitry for PMSM.
• Control of back-electromotive force of PMSM.
• Finite element analysis (FEA) or method (FEM) for electromagnetic analysis of permanent magnet synchronous motors (PMSM).
• Factors that determine the energy efficiency map of PMSM.
• Power and torque densities.
• Torque ripple control mechanisms.
• Copper loss.
• Pros and Cons of PMSM.
• Review of spoke-type RE-free-permanent magnet synchronous motors (PMSM).
• Review of RE-free-permanent magnet-assisted SynRM (PMASynRM).

We look forward to receiving your manuscripts.

Prof. Dr. Yang-Ki Hong
Dr. Shuhui Li
Dr. Vandana Rallabandi
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. Magnetism is an international peer-reviewed open access quarterly 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 1000 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.

• electromagnetics
• rare-earth-free permanent magnets
• permanent magnet synchronous motor
• motor controller