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

发布时间：2018-11-07 12:10

【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。
[Abstract]:Aiming at the problem of large electromagnetic interference of high power and high speed magnetic levitation brushless DC motor, the sensorless control based on linear backEMF depth low pass filter is adopted, and the reasons leading to the inaccuracy of the replacement number of high speed motor are analyzed. The relationship between phase current, device resistance and DC voltage drop is clarified, and the exact expression of phase current when the conversion signal is not accurate is given. In order to solve the problem of inaccurate commutation signal caused by high speed bandwidth of high speed maglev motor, a compensation strategy based on'90? 伪 'and' 150? 伪 'optimal hysteresis switching is proposed. Based on the principle of minimum current pulsation before and after switching, the optimal hysteresis width is determined. The experiment shows that the motor runs smoothly to a maximum of 32 000 r / min, which not only realizes the smooth switching of the two commutation strategies, but also effectively compensates the error of the commutation signal.
【作者单位】：北京航空航天大学惯性技术重点实验室;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;
【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
【分类号】：TM33

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