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Discrete-time LQG/LTR dual-stage controller design in magnetic disk drives

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3 Author(s)
Sang-Min Suh ; Div. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea ; Chung Choo Chung ; Seung-Hi Lee

This paper presents a new dual feedback loop controller design of a dual-stage actuator for hard disk drives. For precise and accurate displacement, coupled dynamic model is considered from the Newton-Euler formulation. A gain factor is introduced so that the level of microactuator's contribution and the high frequency characteristics of the system can be controlled. 2.28 kHz servo bandwidth is achieved. The 6 percent settling time is 250 μs and 3σ value is 0.017 μm from the experimental result

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )