Feedforward control for high precision linear servo system

High precision control has received great attention. Nowadays, as the machines are used for precise operations in manufacturing field, fast and precision control for translational movement are required. In this paper, a linear digital tracking control system is considered to control the position of a non-minimum phase servo system. The system transfer function is obtained via system identification technique using Matlab Toolbox. Feedforward Zero Phase Error Tracking Control (ZPETC) is designed and used in this system. The performance of the controller is analyzed through simulation and real-time experiment by multiple frequency sine wave input. The system is further improved by introducing an error filter to the feedforward controller to increase frequency spectrum. Both controller performances are compared and the result shows significant improvement.