Direct Torque Control(DTC) of induction machines(IM),based on hysteresis comparators and selection table,suffers from variable switching frequency and large torque ripple,especially at low speed.

• 基于磁滞比较器和选择表的感应电机直接转矩控制(DTC),其开关频率可变,且转矩脉动大,特别在低速时。