Design of a dual-stage actuator control system with discrete-time sliding mode for hard disk drives

This paper considers discrete-time design of a dual-stage actuator control system with sliding mode for hard disk drives. A state estimator based sliding mode controller is designed in the discrete time domain. A design methodology is also addressed to complete the design of the control system. The performance of the proposed sliding mode control algorithm is tested through simulations. Very fast seek in microactuator range is attained while not exciting the microactuator resonance. Through the results of simulations it is demonstrated that the proposed discrete-time sliding mode control system is a very prospective technique for disk drives with dual-stage actuators