基于线反电动势的无刷直流电机无位置传感器控制

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Abstract A novel rotor position detecting method based on line back electromotive force (back-EMF) is proposed to implement brushless DC motor (BLDCM) position sensorless control. Rounded analysis is done to draw conclusion that the phase commutation should be made at the moment of zero-crossing of line back-EMF. Line back-EMFs are obtained by sampling two line voltages and phase currents. The commutation points are settled by rules different from existing ones. The phase delay of filtered line EMFs is considered and compensated by using advanced conduction. Finally, simulation and experimental results are given, from which it can be seen that the correct time of commutation points are exactly decided and the phase-shafting error is avoided that occurs when ordinary back-EMF method is used. Additionally, the system is verified to be simplified because it needs less voltage detecting circuit.

Key words： Brushless DC motor (BLDCM) position sensorless control line back electromotive force (back-EMF) zero-crossing point detection phase delay compensation

Received: 14 February 2009 Published: 04 March 2014

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TM383

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	Articles by authors
	Li Zhiqiang
	Xia Changliang
	Chen Wei

Cite this article:

Li Zhiqiang,Xia Changliang,Chen Wei. A Position Sensorless Control Strategy for BLDCM Based on Line Back-EMF[J]. Transactions of China Electrotechnical Society, 2010, 25(7): 38-44.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I7/38

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