小电感无刷直流电动机三相H桥无位置传感器控制方法

发布时间：2018-03-03 12:49

本文选题：无刷直流电动机　切入点：六拍控制　出处：《中国电机工程学报》2014年12期 　论文类型：期刊论文

【摘要】：传统无刷直流电动机的六拍控制采用Y型绕组连接方式,将三相绕组中的两个导通相串联进行供电;其无传感器控制所需的位置信息通过检测未导通相的反电动势过零点得到。绕组串联连接使每一相仅利用母线电压的一半产生电流;同时Y型绕组结构使未导通相受到中性点电压的影响造成位置信号检测精度降低。该文将三相H桥结构应用于无刷直流电动机的无位置传感器控制,使三相绕组中参与导通的两相并联进行供电,同时使未导通相切出电路以进行反电动势过零点检测。绕组并联连接使每一相利用全部母线电压产生电流,电压利用率得到提高;同时未导通相完全切出电路使位置信号检测精度提高。对三相H桥无刷直流电动机无位置传感器控制方法进行了数学推导和分析,并在一台小电感样机上进行了实验,实验结果显示,该4对极样机可以在20 000 r/min的转速下实现无位置传感器控制。
[Abstract]:The traditional brushless DC motor's six-beat control adopts Y-type winding connection mode. The two conduction phases in the three-phase winding are connected in series to supply the power. The position information needed for sensorless control is obtained by detecting the unconductive backEMF over 00:00. The winding series connection causes each phase to generate only half of the bus voltage. At the same time, the position signal detection accuracy is reduced due to the influence of neutral voltage on the unconductive phase due to Y-type winding structure. In this paper, the three-phase H-bridge structure is applied to the sensorless control of brushless DC motor. The two phases in the three-phase winding are connected in parallel to supply power, and the circuit without conduction is cut out to detect the backEMF after 00:00. The parallel connection of the winding makes each phase generate current by using all the bus voltages, and the utilization ratio of the voltage is improved. At the same time, the position signal detection accuracy is improved by cutting out the circuit without conduction phase completely. The position sensorless control method of three-phase H-bridge brushless DC motor is derived and analyzed, and the experiment is carried out on a small inductance prototype. The experimental results show that the four-pair prototype can realize sensorless control at the speed of 20,000 rpm.
【作者单位】：哈尔滨工业大学深圳研究生院;深圳航天科技创新研究院;
【分类号】：TM33

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