混合励磁轴向磁场磁通切换型永磁电机特性分析与试验研究

Performance Analysis and Experimental Study of a Hybrid Excited Axial Field Flux-Switching Permanent Magnet Machine

提出了一种适用于电动汽车驱动系统的E型铁心混合励磁轴向磁场磁通切换型永磁(HEAFFSPM)电机。以一台三相6/10极电机为例,基于三维有限元方法全面研究该电机静态特性,包括气隙磁密、空载永磁磁链、空载反电动势、电磁转矩、转矩-电流特性、绕组电感和磁场调节能力等;研究转子齿扇形角度和转子斜极对电机反电动势和齿槽转矩的影响,分析表明转子齿扇形和转子斜极可以改善反电动势和齿槽转矩波形。制造了一台2 k W样机并对其进行测试,验证了有限元分析结果的准确性,结果表明HEAFFSPM电机的磁链和反电动势均为正弦分布,带载能力和磁场调节能力均较强。

An e-core hybrid excited axial field flux-switching permanent magnet （HEAFFSPM） machine, which was suitable for electrical vehicle drive, was developed. The electromagnetic performances of a 3-phase 6/10 stator/ rotor-pole HEAFFSPM machine, including the air-gap flux density, the PM flux linkage, the back electromotive force （back-EMF）, the electromagnetic torque, the torque-current characteristics, the winding inductances, and the field regulation capacity, were thoroughly investigated based on 3-D finite element method （FEM）. The influences of the rotor pole shape angle and rotor pole skewing on the back-EMF and cogging torque were analyzed. It showed that the back-EMF could be improved and the cogging torque could be reduced with trapezoidal rotor pole shape and skewed rotor pole. A 2 kW prototype was built and tested, which validated the FEM analysis. Results showed that the HEAFFSPM machine exhibits the essentially sinusoidal phase flux linkage and back-EMF, good load-carrying capacity and flexible flux-regulation capacity.