The elevator is the 380v alternating current through the rectifier module for full wave rectifier into DC. And then through IPM or IGBT output. In addition, the Q7 module and the rebound resistor will be the motor cutting magnetic field generated by the power of heat consumption, so the son. All processes are actually inverter work.
In addition, if you want to say measured, some elevator control cabinet can respond to elevator real-time speed, I have seen, unchanged. See a write speed adjustment, if the elevator speed curve adjustment of interest, you can see the PID adjustment