Vibration control of a micro-actuator for the hard disk drive using self-sensing actuation

In this paper, self-sensing control of a micro-actuator for the hard disk drive is presented. The micro-actuator is a suspension driving type. The micro-actuator uses a PZT actuator pair, installed on the assembly of the suspension. The self-sensing micro actuator can be used to form a combined actuation and sensing mechanism. Direct velocity feedback control and positive position feedback control of a self-sensing microactuator for an HDD is presented. The experimental results show that the direct velocity feedback controller and the positive position feedback controller are effective in suppressing the vibration modes. Experiments successfully demonstrate that the self-sensing actuator can be used for active feedback control of the HDD suspension assembly vibration.