基于恒定开关频率的永磁同步电机直接转矩控制

Direct Torque Control of Permanent Magnet Synchronous Motor Based on Constant Switching Frequency

通过定子磁链及其给定幅值和定子电流来估算恒定开关周期内加在电机定子绕组上的参考电压,同时利用空间电压矢量调制方法使逆变器处于恒定的工作频率,开关频率越高,控制性能越好。仿真结果表明该方法有效。

Method of the direct torque control （DTC） of permanent magnet synchronous motor with constant switching frequency is presented in this paper. Through stator flux and magnitude given, and the stator current, the stator voltage needed is calculated in the switching period. The space voltage vector pulse width modulation method keeps the switching frequency constant. The switching frequency is high and the performance are higher. The simulation result indicates that the efficiency of the proposed method.