A new head actuator for high frequency band

Abstract

We propose a new type actuator to suppress the resonance gain in quasi-rigid body vibration mode (QR mode) caused by the stiffness of support bearings. This paper describes a new head actuator for high frequency band. A special design in actuator construction leads to generation of pure torque in the actuator. We applied this actuator for 3.5 inch HDD. The electromagnetic characteristics, mechanical dynamics and performance of the actuator were measured. The results show that the peak gain of quasi-rigid body vibration mode is substantially suppressed with this special design.