Adaptive resonance compensation with the application to hard disk drive

In order to achieve high precision positioning accuracy, the mechanical resonant modes should be suppressed properly in hard disk servo system. The popular conventional method is the open-loop approach where a notch filter is used along with a nominal controller. In this paper, a discrete time adaptive compensator is presented in an efficient and simple way to suppress the effects of resonant modes of the voice coil motor (VCM) actuator of the hard disk drive. Extensive simulation results on the plant model extracted from a commercial hard disk drive demonstrate the effectiveness of the controller.