Frontiers of Electrical and Electronic Engineering >
Modified sliding mode observer for wide speed range operation of brushless DC motor
Received date: 04 Sep 2012
Accepted date: 23 Sep 2012
Published date: 05 Dec 2012
Copyright
This paper describes an adaptive gain sliding mode observer for brushless DC motor for large variations in speed. Sensorless brushless DC motor based on sliding mode observer exhibits multiple zero crossing in back electromotive force (EMF) which leads to commutation problems at low speed. In this paper, a modified sliding mode observer incorporating a speed component in the estimation of back EMF is proposed. It is found that after incorporating the speed component in the back EMF observer gain, multiple zero crossings at low speeds and phase shift at higher speeds are eliminated. The trapezoidal back EMF observer is implemented experimentally on a digital signal processor (DSP) board. The effectiveness of the proposed method is demonstrated through simulations and experiments.
A. DEENADAYALAN , Chintala DHANANJAI , G. SARAVANA ILANGO . Modified sliding mode observer for wide speed range operation of brushless DC motor[J]. Frontiers of Electrical and Electronic Engineering, 2012 , 7(4) : 467 -476 . DOI: 10.1007/s11460-012-0210-2
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