关键词: 感应电机, 直接转矩控制, 恒定频率转矩控制器

Abstract:

The traditional direct torque control(DTC) of induction motor has two disadvantages, variable switching frequency and high torque ripple. To solve the above problems, a constant switching torque controller (CFTC) was proposed. In order to replace the traditional hysteresis comparator, the method compared the torque error with two triangular waveforms which were 180°out of phase with each other and had the same amplitude, and the proposed controller was modeled and linearized. The simulation results show that the proposed CFTC could keep switching frequency stable and had higher precision and better dynamic response at low speed, and the output torque can be effectively reduced and become more smooth.

Key words: induction motor, direct torque control (DTC), constant frequency torque controller (CFTC)