A rotor position detection method based on the state of chip's registers and the features of freewheeling time when motor is commutating was presented for the sensorless control system of Brushless DC(BLDC) motors with no hardware filter circuit. The interference of PWM switching noise and the noise of freewheeling can be avoided by detecting the effective range of non-conducting phase's terminal voltage and delaying an appropriate time to avoid the noise of freewheeling. The method does not need the complex hardware filter and detection circuit, and it also does not need the complex algorithms, so the method has advanced practicability. The theoretical derivation proves the correctness of the method, and the control results are given under different PWM duty cycles and loads in the experiment, which confirms the validity of the presented method.
王大方,于知杉,金毅,朱洪彪,王明玉. 无位置传感器无刷直流电机无硬件滤波转子位置检测方法[J]. 电工技术学报, 2017, 32(19): 71-80.
Wang Dafang, Yu Zhishan, Jin Yi, Zhu Hongbiao, Wang Mingyu. Research of Rotor Position Detection for Sensorless BLDCM without Hardware Filter Circuit. Transactions of China Electrotechnical Society, 2017, 32(19): 71-80.
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2017, Vol. 32 
