反电动势过零检测无刷直流电机转子位置新方法

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Abstract A novel method of rotor position identification of brushless DC motor (BLDCM) is proposed by line voltage calculation based on the traditional zero-crossing of back EMF. The unexcited phase back EMF signal is indirectly obtained from line voltage calculation instead of traditional hardware sensing method. The real commutation point is the zero-crossing of back EMF shifted by 30°. The relationship between motor neutral voltage and half DC voltage is detailedly analyzed. In the double switch PWM scheme, the diode freewheeling currents in the unexcited phase are eliminated completely so that double switch PWM strategy is available for proposed rotor position estimation scheme. This method is simple to implement without the need to sense or reconstruct the motor neutral. Neither hardware circuit of sensing back EMF nor depth filter circuit is needed. Simulation and experimental results verify the validity of the proposed scheme of sufficient identification accuracy in a wide speed range.

Key words： Back EMF sensorless control BLDCM commutation PWM

Received: 12 June 2008 Published: 17 February 2014

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TM381

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	Li Zicheng
	Cheng Shanmei
	Cai Kai
	Qin Yi

Cite this article:

Li Zicheng,Cheng Shanmei,Cai Kai等. A Novel Scheme of Sensing Rotor Position of BLDCM Based on the Zero-Crossing of Back EMF[J]. Transactions of China Electrotechnical Society, 2009, 24(7): 52-58.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2009/V24/I7/52

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