一种改进的无刷直流电动机转子位置反电势检测方法

Improved Back-EMF Method of Sensorless BLDC Motor

反电势过零法是检测无刷直流电机转子位置信息的最简单常用的一种方法。通过分析典型的无位置传感器无刷直流电机反电势过零检测的原理,提出一种反电势过零检测的改进方法。常规反电势过零检测电路由于受到硬件及控制方法的影响,过零点信息不够准确而且有较大的滞后,通过对检测电路的改进来减小这种影响。最后通过试验验证了这种检测方法的有效性。

The back-EMF method is the simplest and most popular method for detecting the rotor position of sesorless brushless DC motor. Animproved sensing back-EMF method of sensorless BLDC motor was proposed by analyzing typical back-EMF zero-crossing detecting method. The conventional back-EMF zero crossing method was restricted by hardware and control method, and to improve the detecting circuit reduce the influence. The conclusion was validated by an examination.