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Analysis of Winding Forms for Bearingless Flux-Switching PM Motor with U-core Stator Laminations
Authors:Qiang Ding  Tuocheng Ni  Xiaolin Wang  Zhiquan Deng
Affiliation:1. College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjin, Jiangsu, China;2. Department of Electrical Engineering, Nanjing Institute of Industry Technology, Nanjing, Jiangsu, China
Abstract:Due to low-cost and magnet-free rotor structure, bearingless flux-switching permanent magnet motors (BFSPMs) are more applicable to high-temperature and/or disposable applications. A BFSPM with U-core stator laminations is investigated in this paper. First, the operational principle is analyzed in accordance with the influence of winding connection manners on torque and radial forces, and then the basic winding arrangement for torque windings and radial force windings is determined. The mathematical models of torque and radial forces are derived based on the basic winding arrangement. Followed by that, a method to select winding terminal connection manners is proposed by taking into account control scheme and power inverter topologies. A promising terminal connection is found from three possible candidates and a detailed current model for torque and radial force control are given for the promising winding forms. Finally, relevant electromagnetic properties of the motor are verified and analyzed by finite element analysis.
Keywords:bearingless motors  flux-switching PM motors  winding configuration  mathematical model  finite element analysis
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