一种基于Hpwm-Lpwm的BLDCM转子位置估算方法

A Method of BLDCM Rotor Position Estimation Based on Hpwm-Lpwm

在分析传统反电动势检测原理的基础上,提出一种基于端电压实时计算的永磁无刷直流电机(BLDCM)转子位置估算方法。该方法不需要构造电机中点和端电压深度滤波电路,简化了硬件的结构并减小滤波电路带来的相移。利用实时计算端电压检测出相反电动势过零点,然后延时电角度近似得出实际的换相点。通过分析不导通相续流情况,证明了PWM-ON-PWM和Hpwm-Lpwm调制方式适用于该简化方法,在Matlab/Simulink仿真和PAC522 0Demo板实验平台上验证了该方法的可行性。

On the basis of analyzing principle of traditional back electromotive force detection, a method of permanent magnet BLDCM rotor position estimation is proposed by real-time calculation of terminal not construct machine neutral and depth filter circuit of terminal voltage so as to simplify vohage. This method needs the hardware structure and reduce the phase shift caused by filter circuit. Detecting phase back EMF zero-crossing through？ real-time？ calcu- lation？ of terminal voltage, the actual commutation point can be obtained by delaying electric angle approximately. After analyzing the non-conducting phase freewheeling current situation,it shows that the PWM-ON-PWM and Hp- wm-Lpwm modulation methods are applicable to this simplified method. Simulation on the Matlab/Simulink and ex- periment on PAC5220Demo platform verified the feasibility of the proposed method.