单个电流传感器实现的无刷直流电动机相电流检测

The Detection of Phase Current in BLDC Motor Drive System by One Current Sensor

无刷直流电动机的输出转矩与相电流大小成正比，通常为构成电流闭环及保护，需要采用多个电流传感器。本文提出的新的相电流检测方法，则只需一只电流传感器。实验验证了该方法是正确和有效的。

Brushless DC(BLDC) motors produce electromagnetic torque in proportion to its winding current level. Traditionally,the realization of a closed loop current controller depends on several current sensors used to detect winding currents in a BLDC motor drive system . This paper presents a novel approach which only needs one current sensor while detecting winding current. Its correctness has been verified by experiments.