关键词: 永磁同步电机, 直接转矩控制, 磁链观测, 改进型磁链积分方法

Abstract:

In order to solve the problems of the voltage model and the current model of flux linkage observation in traditional direct torque control(DTC),two improved integral methods for the voltage observation model of the stator flux linkage of permanent magnet synchronous motor are analyzed and compared,the combination of theory and simulation analysis shows that the improved integral method could improve the observation results, especially in the DC bias, amplitude attenuation and phase shift at different speed. Finally, the advantage of the improved integral method is compared with the traditional pure integrator by experiments,shows that the improved integral method of the voltage model can significantly improve the observation effect of the amplitude attenuation and phase shift for the estimated stator flux linkage.

Key words: permanent magnet synchronous motor, direct torque control (DTC), flux observation, optimized integral method