用于混合动力车的复合结构永磁电机电磁优化设计

Electromagnetic Optimization Design of Compound-Structure Permanent-Magnet Motor for Hybrid Electric Vehicle

为改善混合动力车的行驶平稳性,该文对混合动力车用复合结构永磁电机的电磁结构进行优化设计,以减小由于磁路参数的非线性变化引起的电机转矩脉动。首先,介绍基于复合结构永磁电机的混合动力车的组成及其典型的工作模式。接着,建立三相静止坐标系下复合结构永磁电机的状态方程,研究其转矩特性。然后,基于有限元法优化设计复合结构永磁电机的电磁结构,以降低内外磁场耦合程度,减小转矩脉动。最后,依据所选参数建立电机模型,对比优化前后电机的电磁性能,验证电磁优化设计的合理性,并根据复合结构永磁电机的磁链波形指出该电机需继续研究的方向。

The electromagnetic structure of compound-structure permanent-magnet(CSPM)motor for hybrid electric vehicle(HEV)was optimized in this paper to reduce the torque ripple caused by the nonlinear variation of the magnetic circuit parameters,then the running stability of HEV would be improved.Firstly,the structure and typical work mode of HEV based on CSPM motor were introduced.Next,the state equation of CSPM motor under three-phase stationary coordinate system was established to study the torque characteristic of it.Then,the electromagnetic structure of CSPM motor was optimized using finite element method(FEM)to reduce the coupling degree between the internal and external magnetic fields,then reduce the torque ripple.Finally,the motor model is established based on the selected parameters,and the rationality of the electromagnetic optimization design is verified by comparing the electromagnetic performance of CSPM motor before and after optimization.The direction for further research is pointed out according to the flux linkage of CSPM motor.