Closed Loop Control Commutation Strategy of Brushless DC Motors without Position Sensor Based on Virtual Neutral Point
Li Hong1, Jin Hao2, Li Haitao2, Zhou Xinxiu2
1.Novel Inertial Instrument & Navigation System Technology Key Laboratory of Fundamental Science for National Defense Beihang University Beijing 100191 China 2.Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory Beihang University Beijing 100191 China
Abstract:To reduce the commutation error of Brushless DC motors position sensorless,this paper presents a novel Non position commutation error corrected method achieved by a close loop,and which is based on virtual neutral point of the brushless DC motor.voltage difference between the virtual neutral point and middle point of driving voltage are identified.The relationship between the voltage difference and Commutation error are also analysed in this paper.After that,the voltage difference was sampled before and after the commutation points.These two results are subtracted as feedback quantity in commutation error controller.Then a control loop is established to reduce the commutation error which aim is the voltage difference approaching zero.The control part is a PI controller.In the Experiment,15° commutation error is given to verify the method,The result proves that this method is stable and reliable,and it can component the commutation time quickly when it is influenced by external factors.It only took about 70 steps to convergence to the steady state at 1 500 r/min and 40 steps at 3 000 r/min for the 15°.
李红, 金浩, 李海涛, 周新秀. 一种基于电机虚拟中性点的无刷直流电机无位置换相误差闭环校正方法[J]. 电工技术学报, 2017, 32(1): 175-182.
Li Hong,Jin Hao,Li Haitao,Zhou Xinxiu. Closed Loop Control Commutation Strategy of Brushless DC Motors without Position Sensor Based on Virtual Neutral Point. Transactions of China Electrotechnical Society, 2017, 32(1): 175-182.
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