Optimization and Analysis of a Novel Magnetic-Geared Hybrid Excitation Motor Considering the Thermal Magnetic Coupling

作者：Wu, Zheyu; Jing, Libing^*

来源：Journal of Electrical Engineering & Technology, 2023, 18(6): 4151-4158.

DOI：10.1007/s42835-023-01593-x

• MGHEM
• DC winding
• Air-gap flux density adjustment
• Thermal magnetic coupling

Magnetic-Geared Motor (MGM) is a new type of permanent magnet motor with multiple modulated air gaps. Application prospects of MGM in hybrid vehicles, aerospace and other fields have gained widespread attention due to its high torque density and power factor. But the output torque of MGM cannot be adjusted because of the invariable output torque of magnetic gear. In this paper, a novel 4/22 Magnetic-Geared Hybrid Excitation Motor (MGHEM) is presented. DC winding slots are added in both sides of the stator teeth to adjust the flux of the external PM and output torque. The structure parameters of MGHEM are optimized by a multi-objective genetic algorithm to suppress temperature rise to reduce irreversible demagnetization and to accommodate higher rotor speeds. The electromagnetic properties of MGHEM are analyzed and compared with conventional MGM through finite element method. The results show that MGHEM has ability to increase torque transmitting ability and range of speed. The irreversible demagnetization of PM is reduced by optimization considering the thermal magnetic coupling.