四轮驱动电动汽车永磁无刷轮毂电机转矩分配

四轮驱动轮毂电机电动汽车采用4个永磁无刷轮毂电机驱动,根据轮毂电机的反电势接近正弦波的特点,采用磁场定向控制方法可以实现最大转矩电流控制。该文在永磁同步电机磁场定向控制效率模型的基础上,提出了相同转速转矩下的多永磁同步电机系统效率模型,根据此模型证明了多永磁同步电机系统相同转速下转矩平均分配可使电机系统效率达到最优。将此结论应用到四轮驱动电动汽车轮毂电机转矩分配研究中,通过仿真和实车测试进行验证。仿真和试验结果证明,平均分配永磁无刷轮毂电机转矩可使整车效率最优。

Torque distribution algorithm for a permanent brushless DC hub motor for four-wheel drive electric vehicles

Four in-wheel motors drive electric vehicles are driven by four brushless DC hub motors.Since the back electromotive force(emf) waveform of a permanent brushless DC hub motor is usually nearly sinusoidal,the maximum torque per ampere control can be found using field oriented control(FOC).An efficiency model for a permanent magnet synchronous motor(PMSM) was used in an efficiency model of multi-PMSMs with the same speed and torque.The optimal efficiency can be achieved based on the average torque distribution assuming all the same speed PMSMs.This conclusion can be applied to the torque distribution of brushless DC hub motors for four-wheel drive electric vehicles.Simulation and experimental results show that the average torque allocation to the four hub motors of the electric vehicle gives the best efficiency.