FDB spindle motor design for vibration suppression

This paper aims at investigating the effects of variation in parameters of the FDB spindles on the total in-plane vibration of the disk-spindle systems in HDDs. For the parametric study, the in-plane FRF of the disk-spindle system subjected to the inplane base excitation is presented for each set of the varying parameters such as: the stiffness and damping coefficients of the radial FDBs, the radial bearing locations, and the stiffness coefficient of the torsional spring representing the hub flexibility. The parametric study reveals that an increase in the radial FDB coefficients significantly suppresses the amplitude of the half-speed whirls. Moreover, the spindle hub design with higher rigidity can reduce the amplitude of the rocking modes.