A New Control Strategy for Linear Motor Vibration Suppression

Linear motor has good performance and be able to realize high precision positioning. But, due to no transmission, damping ratio of the linear motor is too small. Then, the vibration cannot be well damped. To suppress linear motor vibration, a new control structure based on traditional cascaded PID control strategy is proposed in this paper. A new control loop is added to connect outer-loop with inner-loop. This control structure has less time delay and has less impact to system dynamics. So the PID parameters do not need to change. Experiments show that this control structure can suppress linear motor vibration effectively.