电动汽车永磁同步驱动电机控制器用变权重叠加型过调制方法

The over-modulation method used in the drive motor controller of electric vehicle can increase the maximum output power of motor drive system，and enhance the capabilities of torque output and speed regulation in high-speed region. However，the traditional over-modulation method has the problem of voltage mutation in the over-modulation zone II，leading to a large jitter of the output torque of motor drive system and affecting the power and NVH performances of the vehicle. In view of this problem，a superposition-based variable-weight over-modulation method is proposed in this paper. The method eliminates the voltage mutation and hence reduces the total harmonic distortion by introducing the phase angle of the reference voltage into the calculation of the superposed weighting factor. The results of simulation and test show that this method can enhance the current stability in drive motor control，reduce the output torque jitter of the drive motor system，and enable the motor drive system of electric vehicle to output the maximum torque and maximum speed in the high-speed region.