无刷直流电机转矩脉动控制新方法

A New Approach of Control-Based Reduction of Pulsating Torque for Brushless DC Motor

提出了一种基于控制器技术的齿槽转矩和波动转矩的最小化方法,并将其应用到无刷直流电机的驱动控制中,该驱动系统的所有稳定控制器均可用一个独立的Q-参数来描述,在系统参数发生变化时,能获得鲁棒稳定性和良好的动态性能.基于BLDCM的数学模型,利用速度的变化来反映转矩的波动,依赖一个闭环速度控制器来减小电机的转矩脉动,该速度环不仅能减小电机转矩脉动引起的速度波动,同时对于其他的速度干扰也有很好的抑制作用.仿真结果表明:在系统参数发生变化及存在噪声的情况下,在参考速度和负载转矩发生改变时,所提出的控制策略都具有很好的响应特性.

The set of all stabilizing controllers for the drive system is characterized by two free Q - parameters of the controllers and is used to achieve both robust stability and good dynamic performance against the variation of system parameters. This approach utilizes mainly the variation of speed to represent the pulsation of torque and relies on a surrounding closed-loop speed regulator to attenuate the pulsating torque. The speed loop acts to attenuate any speed variations caused by the motor pulsating torque in the same way it responds to reject any other sources of speed disturbance. Simulation results show that good response of the control system due to noise, variation of system parameters and the step change-of-speed command/load torque can be achieved using the proposed controller.