基于霍尔位置信号的无刷直流电机电磁转矩观测

Electromagnetic Torque Observation of Brushless DC Motor Based on Hall Position Signals

针对无刷直流电机,在分析反电动势波形函数与霍尔位置信号关系的基础上,提出了一种新颖的电磁转矩观测方法,解决了无连续转子位置信息条件下转矩大小及符号的正负观测问题。与传统方法相比,本文所提方法只需离散的霍尔位置信号,无需连续的转子位置信息及反电动势波形。实验表明,在电机稳态运行、正/反转切换的过渡过程中,该方法都能够有效地计算出转矩的大小与符号的正负,可用于无刷直流电机的直接转矩控制。

This paper proposed a novel electromagnetic torque observation method for brushless DC motor(BLDCM),based on analysis of the relationship between back electromotive force(back EMF)waveform function and hall position signals.This method solves the problem of observation of torque's amplitude and sign without continuous rotor position information.Compared with traditional methods,the proposed method doesn't need continuous rotor position information and the back EMF waveform,but only the discrete hall position signals.The experimental results show that,the amplitude and sign of the torque can be calculated effectively,both in steady state and the forward/reverse running switching process,the proposed method can be used in direct torque control(DTC) of BLDCM.