A Feedrate Planning Method in CNC System Based on Servo Response Error Model

Reducing servo response error and further making reduction on contour is crucial for high-precision computer numerical control (CNC) machine tools. For a permanent magnet synchronous motor (PMSM) system, there always lag in feedrate tracking, which would introduce into the machining trajectory. Therefore, it necessary to improve performance of planning interpolation trajectory path. In this paper, novel compensation strategy proposed. Compared with mainstream methods, proposed method offers simplified alternative existing estimation techniques. Through three-closed-loop structure PMSM model founded. Afterwards, an improved S-model introduced according compensation. This predicted subsequently compensated each cycle, resulting error. Finally, simulations experiments are performed demonstrate that can be reduced both ‘∞’-shaped Non-Uniform Rational B-Spline (NURBS) curve path butterfly-shaped NURBS using method.