A Study of a Safe Torque Off and Electronic Star Sealing Technology

This At present, elevators are mainly used to ensure operational safety through the cooperation of various electrical safety devices and installation components, and all kinds of safety protection devices basically adopt passive safety protection measures of electrical technology or mechanical technology. Especially when the permanent magnet synchronous motor is used as the traction host, many functions rely heavily on the safety and reliability of the brake itself, and when the brake fails, the safety protection device using the brake as the stopping component also fails. This scheme realizes the protection of personnel when the elevator braking torque is insufficient to cause slipping of the ladder by centralized control of the controllable switching tube of the inverter inverter module in the drive system, and the use of the conduction of the controllable switching tube to short-circuit the input of the traction machine for the electronic sealing of the star. The upper bridge isolation unit and the lower bridge isolation unit of the inverter are used to process the PWM drive signals from the processor for control respectively; this research is to realize torque cut-off through pure hardware isolation circuit, and can be well combined with the function of sealing star, which is not only small in size and simple in assembly, but also has a high level of safety. The integration of safe torque cancellation and electronic sealing star has positive significance for the safe operation and maintenance of elevators, and provides a solid foundation for the elevator to adopt active safety protection measures, which has a broad application prospect in the future.