一种统一的无刷直流电机直接反电动势法

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Abstract The direct back electromotive force(EMF) detection method by synchronously sampling the motor back EMF during the pulse width modulation (PWM) off time has been extensively applied in a sensorless brushless DC (BLDC) motor drive. But this direct back EMF sensing scheme is only suitable for the mode whose high side switch is PWM and low side switch is on. On the basis of the research into the traditional model and the working principle of the brushless DC motor, a simplified model of the brushless DC motor is formulated, by which an analysis of the voltage characteristics under different PWM technologies is made. A method of obtaining the back EMF zero-crossing information by comparing the open phase voltage with one half of DC link voltage during PWM on time is proposed and experimented on the prototype. The experimental results show that the proposed control algorithm does satisfactory performance over a wide operation range under various PWM modulation modes.

Key words： Direct back electromotive force detection method brushless DC motor PWM sensorless rotor position detection

Received: 26 June 2009 Published: 04 March 2014

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TM351

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	Xue Xiaoming
	Yang Chong

Cite this article:

Xue Xiaoming,Yang Chong. A Unified Approach to Direct Back EMF Detection for Brushless DC Motor[J]. Transactions of China Electrotechnical Society, 2010, 25(9): 62-68.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I9/62

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