无刷直流电动机二阶离散平滑滤波器位置伺服控制

Position Servo Control of Brushless DC Motor Based on the Second Discrete Filter

A novel position servo controller for a brushless DC motor was designed based on the improved second discrete smooth trajectory filter. The output of the filter is suitable for the feed-forward control for the servo system, especially for the second order system, which guarantees minimum time response and smooth trajectory tracking. Based on the second order model of the Brushless DC motor, the cascade servo control of the brushless DC motor was implemented upon the second discrete filter algorithm. The outer-loop of the whole control system was realized by the second discrete filter, and the inner-loop used the traditional PI current controller. It has the integrative merits of linear and nonlinear control methods. Moreover, a load torque observer was advanced to enhance the anti-disturb ability of the servo system when the brushless DC motor running with the motor parameters change and/or external load variation. The proposed control method can obtain the excellent position tracking performance and a good speed response ability. Simulation and experiment results show that the control scheme is valid and effective.