Abstract：A novel sensorless scheme for brushless DC (BLDC) motor drives is presented in order to solve the problem that it is very difficult to detect the rotor position at low speeds. The method is based on the fact that stator windings inductance of salient BLDC is the function of the rotor position. When the H_PWM-L_PWM modulation mode is adopted for the salient BLDC motor, the fluctuation of neutral point voltage could be used to justify if the self inductance of energized stator windings is equal, from which the zero-cross point of back electromotive force (back-EMF) could be determined. Referring to the back-EMF method, there is offset between zero-cross point of back-EMF and required commutation positions, which must be compensated to ensure efficient and smooth operation of the motor. Theoretical derivation proves this method is correct. In the experimental system, the commutation signal from the proposed method is compared with the signal form Hall sensor and results confirm the validity of the proposed method.
王华斌, 刘和平, 张毅, 刘平. 计及中性点电压的无刷直流电机无位置传感器控制[J]. 电工技术学报, 2009, 24(7): 46-51.
Wang Huabin, Liu Heping, Zhang yi, Liu ping. Sensorless BLDC Drive Allowing for Neutral Point Voltage. Transactions of China Electrotechnical Society, 2009, 24(7): 46-51.
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