微特电机 ›› 2018, Vol. 46 ›› Issue (8): 84-87.doi: 1004-7018-46-8-84-87

• 驱动控制 • 上一篇    下一篇

无刷直流电动机无位置传感器闭环控制研究

张劲恒,杨扬   

  1. 南昌理工学院,南昌 330044
  • 收稿日期:2018-01-15 出版日期:2018-08-28 发布日期:2018-08-28
  • 作者简介:张劲恒(1972—)男,硕士,副教授,研究方向为工业机器人技术。

Research on Sensorless Closed-Loop Control System of Brushless DC Motor

ZHANG Jin-heng, YANG Yang   

  1. Nanchang Institute of Technology,Nanchang 330044,China
  • Received:2018-01-15 Online:2018-08-28 Published:2018-08-28

摘要:

为了实现无刷直流电动机(BLDCM)无位置传感器闭环控制,研究了基于逆变器直流环中点电压为参考点,利用线电压来实时计算相反电动势的转子位置辨识方法。该方法不需要建立电机中点或虚拟中性点,通过检测无刷直流电动机三相绕组与直流环中点之间的电压,经过软件实时计算,可以得到三相绕组反电动势过零点,进而可以得到每个器件对应时刻的切换点。无刷直流电动机的起动过程采用预定位-外同步-自同步三段式起动方法,可以在全压型、PWM调制模式下实现电机稳定闭环起动,并通过仿真验证了该方法的正确性和有效性。

关键词: 无刷直流电动机, 闭环控制, 无位置传感器, PWM调制

Abstract:

In order to realize sensorless closed-loop control of BLDCM, the rotor position identification method based on inverter DC link mid-point voltage as reference point and using line voltage to calculate phase back electromotive force (EMF) in real time was proposed. The method does not need to construct the mid-point of the motor or the virtual neutral point. By detecting the voltage between the three-phase windings of the brushless DC motor and the mid-point of the DC link, the zero-crossing of the three-phase windings back electromotive force and the switching point for each device corresponds to the moment were obtained. The starting process of brushless DC motor adopted pre-positioning, external synchronization, self-synchronization, which can realize stable closed-loop starting of the motor under full-voltage and PWM modulation mode. The simulation results show the correctness and validity of the commutation control method.

Key words: brushless DC motors, closed-loop control, sensorless, PWM modulation

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