Non-linearity compensation for hard disk drives

Details Non-linearity compensation for hard disk drives Non-linearity compensation for hard disk drives

1994-05-16

1995-12-19

Chilcot, Richard

Measuring and testing

Dynamometers

Responsive to force

360 7807, G11B 500

Patent

active

054760151

ABSTRACT:
An improved method for compensating for the irregularity in the torque constant of the electric motor used to move the actuator arm carrying the magnetic read/write head in a disk drive is disclosed. The torque constant of the electric motor varies across the operating range on a given drive as a function of head location and the variation in torque constant is compensated for with a torque constant multiplier. The present invention provides a method for accurately determining the torque constant multiplier versus position function of a particular disk drive. In one embodiment, the method of the present invention includes the steps of: determining a nominal operating range for the location of a head over a disk for substantially all disk drives manufactured with the same manufacturing process; determining the offset of the operating range of a particular disk drive relative to the nominal operating range; modifying the location of the head, as determined by reading servo information, of the particular disk drive based on the offset; and obtaining the value of the torque constant multiplier associated with the modified head location.

REFERENCES:
patent: 4937803 (1990-06-01), Nakane
patent: 5119250 (1992-06-01), Green et al.
patent: 5132855 (1992-07-01), Waugh et al.
patent: 5305160 (1994-04-01), Funches et al.

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