The traditional direct torque control system has existed large torque fluctuation, poor performance of lowspeed region, inconstant switch frequency, etc.
传统的直接转矩控制存在着转矩脉动大，低速性能差、开关频率不固定等问题。
3
The switch is characterized by simple structure, polarization-independence, low optic insertion loss and interchannel crosstalk, fast response speed, small in size and low drive voltage, etc.