优化磁链算法的稀土永磁无刷电机位置检测方法

A Position Detection Method for BLDCM Based on Optimized Algorithm of Flux Linkage

结合无位置传感器稀土永磁无刷直流电机的特点,在分析经典的稀土永磁无刷直流电机磁链观测法及三次谐波过零检测法的基础上,针对磁链观测法控制精度受电机电抗变化影响,而三次谐波过零检测法需要其他方法配合且不能得到连续转子位置信号的问题,提出磁链基波和三次谐波组合优化的无刷直流电机无位置传感器控制方案。方案对转子磁链三次谐波进行一定的逻辑运算得到三分之一电机旋转周期的连续转子位置信号,利用转子磁链基波信号计算得到的位置信号进行定位,两者配合得到不受电机电抗变化影响的连续转子位置信号,进而控制电机的换向和运行。仿真和实验结果表明,本文提出的方案能够准确检测所需的转子连续位置信号,能够准确控制无刷直流电机的换相。

Based on analysis of the characteristics of permanent magnet brushless DC motor （BLDCM） and classic control strategies like flux estimation and third-harmonic zero-crossing detection method, a novel BLDCM control method based on fundamental and third-harmonic flux linkage was proposed to overcome dif- ficulties of the accuracy of flux estimation and that third-harmonic method need other signals to estimate also cann＇t get continuous signals. Logic operation of third-harmonic flux linkage was made to get continuous rotor position signals of 1/3 motor rotation period, motor approximate positions was based on fundamental flux linkage＇s calculation. Continuous rotor position signals were detected by the coordination of fundamental tion signals were successfully used to control the suits. which isn＇t affected by variation of reactance of motor and third-harmonic flux linkage. Accurate continuous posi- commutation of BLDCM by simulation and experimental re-suhs.