Abstract
In single-stage hard disk drives (HDDs), it is difficult to suppress mid-frequency narrow band disturbances caused by disk flutter or windage effectively. This article presents a nonlinear compensation scheme to deal with narrow band disturbance around 1 kHz. The nonlinear compensator that provides additional phase lead without degrading the magnitude characteristic is proposed. This scheme is used to compensate for phase loss due to narrow band filter and enhance the mid-frequency disturbance suppression capability. Settling performance is verified not to be degraded significantly due to harmonics from the nonlinear element. Our results show that the peak value of power spectra of NRRO due to disk vibration are decreased by 99% and position error signal 3σ value is improved 68%.
Published Version
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