Electromagnetic Design Characterization of Synchronous Machines with Flux Switching Effect Employing Reluctance Rotors and Stators with PMs and AC Concentrated Coils

Authors

• Oluwaseun A. Badewa, University of KentuckyFollow
• Ali Mohammadi, University of Eastern Finland, FinlandFollow
• Donovin D. Lewis, University of KentuckyFollow
• Somasundaram Essakiappan, QM PowerFollow
• Madhav Manjrekar, QM PowerFollow
• Dan M. Ionel, University of KentuckyFollow

Abstract

This paper introduces an innovative design for a synchronous electric motor that has phase coils and permanent magnets (PM) embedded in the stator. The electric machine contains both concentrated winded phase coils in dedicated slots and spoke-type permanent magnets solely in the stator. The spoke-type magnet arrangement achieves a high flux intensity even with low remanence non-rare earth permanent magnets. As the rotor has no active electromagnetic components, the risk for demagnetization is reduced and advanced cooling applied to the stator can enable high-speed operation. The principle of operation and polarity of the motor are investigated with a unique approach including analytical flux density analysis and piecewise computational modeling. A design optimization is performed for a 100kW motor at a speed of 3,000rpm, which is typical for industrial applications. The conflicting objectives of active material cost and motor losses are considered using both rare-earth and non-rare-earth ferrite PMs in the inner and outer rotor configurations of the proposed motor topology. Discussions on the trade-off between conflicting objectives, a specific EV motor design using ferrites, as well as alternative manufacturing, considering achievable slot fill factor (SFF) and choice of steel are also presented. Furthermore, an open-frame lab prototype (OFLP) of the proposed motor topology is constructed and tested to validate the principle of operation and design optimization approach, with due consideration to manufacturing.

Document Type

Article

Publication Date

2025

Digital Object Identifier (DOI)

doi: 10.1109/TIA.2025.3541623

Repository Citation

Badewa, Oluwaseun A.; Mohammadi, Ali; Lewis, Donovin D.; Essakiappan, Somasundaram; Manjrekar, Madhav; and Ionel, Dan M., "Electromagnetic Design Characterization of Synchronous Machines with Flux Switching Effect Employing Reluctance Rotors and Stators with PMs and AC Concentrated Coils" (2025). Electrical and Computer Engineering Graduate Research. 45.
https://uknowledge.uky.edu/ece_gradpub/45