基于线反电动势估算的无刷直流电机无传感器控制策略
首发时间:2017-05-13
摘要:根据无刷直流电机理想换相点与线反电动势过零点同相位的关系,提出了基于线反电动势估算的无位置传感器控制策略。化简了线反电动势的计算公式,给出转子处于不同位置的换相条件。分析了非导通相续流产生的线反电动势估算误差,并给出了解决方案。对低通滤波器造成的转子位置检测误差进行研究,针对电机转速的变化提出了"60 -α"和"120 -α"的补偿策略,拓宽了调速范围。仿真和实验结果显示该策略能够有效的补偿转子位置检测的误差,给出准确的换相信号,电机在高速和低速运行性能良好。
关键词: 电气工程 无刷直流电机 线反电动势估算 无传感器控制 相位补偿
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Novel Sensorless Control Strategy for BLDCM Based on the Estimation of Line Back EMF
Abstract:In this paper, a novel sensorless control strategy based on the estimation of line back electromotive force (back-EMF) is proposed , according to the relationship between the ideal commutation points of the brushless DC motor (BLDCM) and the zero-crossing points of line back-EMF. The calculation formula of line back-EMF is simplified properly and the commutation rules for different positions of the rotor is presented. The estimation error of line back-EMF caused by the freewheel current of silent phase is analyzed and the solution is given. The phased delay of the low-pass filter is considered,and a new compensation method for "60 -α"&"120 -α" is studied in this paper to elimination the error. Finally, the simulation and expermentalresults show that the rotor-position-detection error is avoided effectively and the motor driven by the accurate commutation signal can work well in low speed and high speed.
Keywords: electrical engineering brushless DC motor (BLDCM) line back-EMF estimation sensorless control phase delay
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