无位置传感器永磁无刷直流电机的反电动势过零点相电压检测法由于低通滤波器和二极管续流造成非导通相相电压过零点相移与反电动势过零点不一致。经分析、仿真和试验,确定了过零点相移问题的原因。为此,提出了AD采样端电压检测反电势过零点的方法。通过试验证明了该方法的可行性。

In sensorless permanent brushless DC motor control systems based on backEMF zerocrossing detection, nonconducting phase voltage was distorted and backEMF zero crossing phase was shifted due to low pass filter and diode freewheeling. This problem was proved by math model, simulation and experiment, then a method of using AD module to detect backEMF zero crossing was presented and finally the method was proved by experiment results.

TM 33