摘要：分析了BLDCM三相反电动势波形、三相端电压波形与电机转子位置关系。对BLDCM无传感器控制方式下转子位置的精确检测作出研究。利用电机转速、当前导通相、PWM频率与电机转子位置间关系，通过对电机逆变侧所通PWM脉冲进行计数，并采用校正算法来确定电机转子的精确位置。在Matlab/Simulink下对该转子位置检测方法进行建模，设计了基于DSP F2812的BLDCM控制平台。仿真和实验对比验证表明，该类检测方法能准确得到电机转子所处位置，满足转子位置精确检测的精度与要求。

关键词：永磁无刷直流电机；无位置传感器控制；转子位置检测
Abstract: The relationship among the permanent magnet brushless DC motor back EMF, terminal voltages and rotor position was analyzed An accurate detection of rotor position for sensorless BLDCM was studied in this paper Then a new method of accurate detection of rotor position based on the corresponding relation among motor speed, commutating, PWM frequency and rotor position was proposed Detection was guided by counting the PWM from motor′s inverter side and a correction method was used to calibrate the accurate position of motor rotor A simulation system based on Matlab/Simulink and a hardware system based on DSP F2812 were put up Simulation and experimental results verified the reliability and utility of the detection method which could detect the rotor position rightly

Key words: BLDCM；sensorless control；detection of rotor position