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A novel position detection method of sensorless brushless DC motor based on sliding mode observer

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3 Author(s)
Lin Qinghua ; Electr. Power Coll., South China Univ. of Technol., Guangzhou, China ; Yang Xiangyu ; Zhao Shiwei

A brushless DC motor requires a rotor position sensor for speed and current control, but the sensor will increase the cost and size of motor and limit the industrial applications. In some specific applications, a brushless DC motor without a sensor is needed, which raises a problem of rotor position detection and speed control. In this paper, a new estimating method is proposed using an improved sliding mode observer, in which the discontinuous control is replaced by using the sigmoid function in order to reduce the chattering problem commonly found in the conventional sliding mode observer, then a phase lock loop based algorithm is adopted to calculate the rotor angular and velocity. The simulation results demonstrate that this method can achieve a good performance both in steady and transient operating.

Published in:

Power Electronics Systems and Applications (PESA), 2011 4th International Conference on

Date of Conference:

8-10 June 2011