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Commutation Strategy of High-Speed Maglev Brushless DC Motors Based on the Line-to-Line Back-EMF without Position Sensor
Pages: 119-128
Year: Issue:  9
Journal: Transactions of China Electrotechnical Society

Keyword:  Brushless DC motorline-to-line back-EMFposition sensorlessdepth filteroptimal width of the hysteresis;
Abstract: 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.
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