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Matt Woongkul Lee

Michigan State University


Dr. Matt Woongkul Lee - Matt is broadly interested in high-performance motor
drive, power electronics, electric machines, and distributed energy resources. He
was a postdoctoral research associate at WEMPEC, University of Wisconsin-
Madison from 2019 to 2020. Before that, he spent 6 years at UW-Madison for both
M.S. and Ph.D. degrees both in electrical engineering. In 2020, he joined Michigan
State University as an assistant professor continuing his research in power
electronics and electric machines.


Rare-Earth-Free Electric Machine Design for Traction Applications Considering Recycling Aspects

This paper focuses on designing a new wound-field flux-switching machine (WFFSM) that considers recycling its components once the machine's end of life (EoL) is reached, and the machine is scrapped. WFFSMs possess effective thermal management capability, fault tolerance, and improved flux-weakening through variable flux operation. WFFSMs have both field and armature windings in the stator, eliminating permanent magnets in the rotor for a simple and robust machine design (Fig.1). Both windings are wound around the stator yoke instead of the stator pole. The design is suggested with toroidal field and armature windings, which simplifies the access of the copper at the EoL. Besides easier winding extraction toward a recycling process, this kind of stator is relatively easy to manufacture with a higher fill factor. It also provides better cooling because the stator winding is directly exposed to the stator housing with a cooling jacket.

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