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为了提高变速非圆车削中直线伺服单元的跟踪精度和鲁棒性 ,建立了变速非圆车削的进给驱动直线电机、运动控制目标函数、主轴变速、切削力等的数学模型 ,分析了主轴变速精度对直线伺服单元控制的影响。应用重复控制理论设计了适于直线伺服单元的重复控制器 ,给出了详细的设计过程和稳定性分析 ,对控制器的性能进行了仿真分析。结果表明 ,基于重复控制的直线伺服单元能很好地跟踪变速非圆车削中刀具运动的目标值 ,能抑制波动的切削力对跟踪精度的影响。
In order to improve the tracking accuracy and robustness of the linear servo unit in variable speed non-circular turning, a mathematical model of the feed-driven linear motor, the objective function of motion control, the spindle speed change and the cutting force of variable speed non-circular turning was established. The effect of precision on the linear servo unit control. Repetitive control theory is applied to design a repetitive controller which is suitable for linear servo unit. The detailed design process and stability analysis are given, and the performance of the controller is simulated. The results show that the linear servo unit based on repetitive control can well track the target value of tool motion in variable speed non-circular turning, and can restrain the influence of fluctuating cutting force on the tracking accuracy.