关键词: 非恒值磁链幅值给定, 永磁同步电动机, 空间电压矢量调制, 变限幅改进型积分器, 直接转矩控制

Abstract:

For permanent magnet synchronous motors direct torque control system based on space vector modulation (SVM-DTC) with inconstant flux amplitude reference, conventional modified integration with constant amplitude limiter could not observe the stator flux accurately, and had bad output performance. A new modified integration with variable amplitude limiter was proposed to observe the stator flux accurately in the SVM-DTC system with inconstant flux amplitude reference, it also can improve stability and power factor of the motor.

Key words: inconstant flux amplitude reference, permanent magnet synchronous motors, space vector modulation (SVM), modified integration with variable amplitude limiter, direct torque control (DTC)