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Adaptive compensation for position error signal nonlinearity

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2 Author(s)
Cooper, E. ; Adv. Technol. Center, Lockheed Martin Space Syst. Co., Palo Alto, CA, USA ; Hampshire, R.

The magnetoresistive (MR) magnetic head is a poor positioning transducer for a disk file's servo control system because its positioning response is nonlinear with radial displacement. This paper shows how the MR head's poor positioning properties are alleviated by a self-adjusting adaptive algorithm that allows a disk file to linearize its own servo position error signal (PES). The adaptive linearizer uses a nonlinear state estimator whose nonlinearity adjusts to match the nonlinearity of the PES. As the match between the two nonlinearities adaptively improves, the state estimator gives increasingly accurate estimates of the true actuator position

Published in:

Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 3 )

Date of Publication:

May 2002

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