重载条件下无刷直流电机无位置传感器驱动换相续流影响的分析及其补偿  

Analysis and Compensation of Commutated Current Freewheeling for Sensorless Brushless DC Motor Under Heavy-load Condition

作　　者：杨明[1] 刘杰[1] 徐殿国[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2013年第30期106-112,16,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51007012)~~

摘　　要：无刷直流电机(brushless DC motor,BLDCM)换相时刻关断相电流的续流造成电机端电压的畸变。当采用无位置传感器反电动势过零检测法时,端电压波形畸变会使位置检测信号相位超前,偏离最佳换相时刻,重载条件下甚至会造成换相失败,制约了反电动势检测法的电机功率应用范围。因此,该文针对电流续流影响端电压的机理加以分析,建立了电流续流产生相位超前的数学模型,并给出了位置检测信号相位超前的补偿算法。仿真和实验结果表明,经过补偿后的位置检测接近最佳换相时刻,重载条件下仍可正常运行。At the communication moment of brushless DC motor （BLDCM）, the terminal voltage is distorted by diode freewheeling current from which phase current will be turn off. Taking the back-EMF zero-cross detection method in sens6dess position control, this terminal voltage distortion can make position detection signal phase ahead, deviating from the best commutation time, especially, in heavy-load condition it can cause commutation failure. Therefore back-EMF zero-cross detection method has been restricted in light-power application. The mechanism of freewheeling current causes advance signal has been analyzed in this paper, and based mathematical model, a position detection signal phase ahead compensation method is presented too. Simulation and experimental results show that the compensated signal is close to the best commutation time, BLDC motor can still be normal operation by sensodess control with heavy-load.

关 键 词：无刷直流电机 无位置传感器控制 续流 相位超前 重载 

分 类 号：TM351[电气工程—电机]