永磁直线同步电动机推力波动的抑制

Suppression of Thrust Fluctuation for Permanent Magnet Linear Synchronous Motor

针对高档数控机床进给系统用永磁直线同步电动机特有的齿槽效应、边端效应所引起的推力波动问题,提出了在应用磁场定向控制技术双闭环结构基础上增加自适应前馈控制器抑制推力波动的新方法。通过实验测量经离散小波变换滤除噪声,得到随直线电机位置变化的实际推力波动波形,基于该波形以查询方式得到补偿电流。给出了控制系统速度控制器、电流控制器、参考电流发生器及前馈控制器的参数设计方法,构造了基于DS1104控制板d SPACE半实物仿真系统实验平台。实验表明,增加自适应前馈控制器对电流进行补偿后,推力波动和速度波动得到了有效抑制,验证了提出方法的正确性和有效性。

In order to handle the thrust fluctuation of end effect and cogging effect caused by the feed system of high-end CNC machine with permanent magnet linear synchronous motor,a new method increased the adaptive feed forward controller to control the thrust fluctuation,which was based on the technology of double loop structure application with magnet field directional control,was put forward. After the experimental measurement,the noise was filtered by the discrete wavelet transformation,and the actual waveform of the thrust fluctuation on the position of the linear motor was obtained,the compensation current was get in inquiry mode based on this waveform. The parameters design method of speed controller,current controller,reference current generator and feed forward controller in control system were presented,and the experimental platform was established based on DS1104 control board d SPACE semi- physical simulation system. Theoretical analysis and experimental results show that the proposed method is effective in suppressing the thrust fluctuation and the velocity fluctuation after the adaptive feed forward controller compensating the current,verifying the correctness and effectiveness of the proposed method.