Comparative Thermal Analysis of IPMSMs with Integral-Slot Distributed-Winding (ISDW) and Fractional-Slot Concentrated-Winding (FSCW) for Electric Vehicle Application

摘要

Fractional-slot concentrated-winding (FSCW) interior permanent magnet synchronous motors (IPMSMs) have been attracting considerable attention due to their high power density, high efficiency, short end-winding, high slot fill factor, low cogging torque, excellent flux-weakening and fault tolerance capability. However, compared to integer-slot distributed-winding (ISDW) IPMSMs, the key challenge of using FSCW configurations is the significant rotor losses, particularly at high speed. To figure out the IPMSM with which winding configuration is more suitable for electric vehicle (EV) application, the thermal behaviors of four IPMSMs with ISDW, single-, double- and four-layer FSCWs are comprehensively and comparatively investigated in this paper. Firstly, electromagnetic design and loss analysis of the four IPMSMs are investigated to meet the EV traction motor requirements. Secondly, finite element method (FEM) is employed to investigate the thermal performance of the IPMSMs under different rotational speeds and torque overload capacities. Besides, the influence of magnet segmentation on the temperature is also taken into account. Finally, some conclusions are drawn for the suitable winding configuration selection and the PM traction motor design.