摘要：无位置传感器无刷直流电机的控制算法是近年来研究的热点之一，有霍尔位置信号直流电机根据霍尔状态来确定通断功率器件。利用无刷直流电机的数学模型，根据反电动势检测原理，提出了一种新的线反电动势检测方法来确定转子位置信息。通过和有霍尔信号的无刷直流电机的速度响应和转矩进行仿真比较，改进的线反电动势法，可以在较宽的速度范围内确定转子位置信息，且力矩输出波动较小。同时该方法无需重构电机中点，结构简单，易于实现，有较高的实用价值。

关键词：无刷直流电机；线反电动势；无位置传感器
Abstract: Sensorless brushless DC motor control is one of the hot spots in recent years. The DC motor that it has Hall position signal determine the rate of movement on or off the device according to the state of Hall. Brushless DC motor using mathematical models, according to the counter electromotive force detection principle, made a new method to detect position information of the rotor. And there is the Hall signal by brushless DC motor speed and torque simulation, improved line back-EMF method can determine the rotor position information over a wide speed range , and the output torque fluctuation. Meanwhile the method does not require reconstruction motor midpoint, simple structure, easy to implement, has a high practical value.

Key words: BLDCM;line back-EMF; sensorless