Research on Commutation Control Method Based on Winding Current of Drive Motor

Abstract

In order to improve the opening and closing operation performance and intelligent level of vacuum circuit breaker, a commutation control mode based on the winding current of motor actuator is proposed. According to the equivalent mathematical model of permanent magnet BLDCM, the corresponding relationship between back EMF and rotor speed is obtained by spline interpolation method. The rotor position is calculated by combining the winding current value and trapezoid quadrature method, and the winding current is detected in real time. The commutation time is calculated by DSP, and the phase change operation is controlled. The on-line test results of the motor actuator of the vacuum circuit breaker show that the method can realize the commutation operation of the drive motor. The angle error between the commutation position of the motor and the commutation position of the hall disk is less than 1°. The influence of the commutation error on the operation time of the circuit breaker is less than 1ms, which meets the requirements of the operation characteristics of the circuit breaker.