Design and dynamic analysis of suspension for dual actuator type HDD

The track density of HDD is increasing rapidly as the recording density drastically increases, which leads to the need for a higher servo bandwidth. To this end, a dual actuator system for HDD has been suggested as a possible solution. Furthermore, the suspension resonance frequency in the radial access direction is becoming a more important factor for the servo bandwidth increase. However, the improvement of these frequencies may affect the shock resistance performance and spring constant. In this work, we have investigated a suspension design scheme possessing a microactualor as a dual actuator and also achieving high-mechanical resonance frequencies, shock resistance characteristics, and a low-spring constant. Using finite element analysis, the design parameters, which play key roles for dynamic characteristics of a suspension, are investigated. Design parameters are deduced based on physical insight and obsen-ations. It is confirmed that the proposed suspension has the capability affine tracking motion as a microactuator, due to its hinge structure on the spring region, and achieves higher mechanical resonance frequencies in the 2nd torsion mode and sway mode with a high-shock resistance and a low-spring constant.