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在实时采样控制的CNC数控系统中圆弧插补普遍用计算法,以一次采样周期内的进给弦长代替弧长计算出两个坐标方向的坐标增量。但为保证算法的简洁,避免复杂的函数运算,一般都进行一系列的简化。从而算法必须解决精度问题,消除积累误差。我们在Intel 8088 CPU的STD总线环境下成功地开发了直流伺服系统的控制,其圆插弧补的速度、精度以及对伺服系统的控制精度等指标均令人满意。本文介绍其中的圆弧插补算法。一、增量计算
In the real-time sampling control of CNC numerical control system commonly used circular interpolation interpolation method to feed the sampling length of the string instead of the length of the arc to calculate the two coordinate increments. However, in order to ensure the simplicity of the algorithm and avoid complicated function operations, a series of simplifications are generally performed. Thus the algorithm must solve the precision problem and eliminate the accumulation error. We have successfully developed the DC servo system control in the Intel 8088 CPU STD bus environment, the interpolation interpolation speed, accuracy and servo control accuracy and other indicators are satisfactory. This article describes one of the arc interpolation algorithm. First, incremental calculation