基于线反电动势的高速磁悬浮无刷直流电机无位置换相策略  

Commutation Strategy of High-Speed Maglev Brushless DC Motors Based on the Line-to-Line Back-EMF without Position Sensor

作　　者：崔臣君[1,2] 刘刚[1,2] 郑世强[1,2] 

机构地区：[1]北京航空航天大学惯性技术重点实验室,北京100191 [2]北京航空航天大学新型惯性仪表与导航系统技术国防重点学科实验室,北京100191

出　　处：《电工技术学报》2014年第9期119-128,共10页Transactions of China Electrotechnical Society

基　　金：国家重大科学仪器设备开发专项(2012YQ040235);国家自然科学基金(61203203)资助项目

摘　　要：针对大功率高速磁悬浮无刷直流电机电磁干扰大的问题,采用基于线反电动势深度低通滤波的无位置传感器控制,分析了导致高速电机换相信号不准确的原因,明确了相电流与器件电阻、器件直流压降的关系,给出换相信号不准确时相电流的精确表达式。针对高速磁悬浮电机转速带宽高带来的换相信号不准确问题,提出一种基于‘90?α’与‘150?α’最优滞环切换的换相信号补偿策略,以电机切换前后的电流脉动最小为原则,确定了最优滞环宽度。通过试验,电机平稳运行到最高32 000r/min,不仅实现了两种电机换相策略的平滑切换,而且对换相信号误差进行了有效补偿。This paper presents a position sensorless control strategy based on depth low-pass filter of the line-to-line back-EMF,and analyzes the cause of the high-speed motor inaccurate commutation and the relationship between the phase current and the resistance and the DC voltage drop of the device considering the large electromagnetic interference of high-power high-speed maglev brushless DC motor.An exact phase current expression in the accurate commutation case is presented then.For inaccurate commutation of high-speed magnetic levitation motor caused by high speed bandwidth,an optimal commutation signal compensation strategy based on hysteresis transition between ‘90-α’and ‘150-α’ is described.The strategy determines the optimal width of the hysteresis complying with the principle of minimum current ripple before and after transition.The motor runs to a maximum of 32 000r/min smoothly through experiments.The Experimental results show that the method achieves smooth transition between the two kinds of motor commutation strategy,and compensates for the commutation error effectively.

关 键 词：无刷直流电机 线反电动势 无位置传感器 深度滤波 最优滞环宽度 

分 类 号：TM315[电气工程—电机]