Measuring stiction and friction between the heads and discs of a

Details Measuring stiction and friction between the heads and discs of a Measuring stiction and friction between the heads and discs of a

1997-04-30

1999-01-12

Raevis, Robert

Measuring and testing

Frictional resistance, coefficient or characteristics

G11B 1546

Patent

active

058593586

ABSTRACT:
Apparatus and method for measuring the maximum static friction force and the kinetic friction force between the heads of a disc drive and discs adjacent the heads. The disc drive is rotated by a computer controlled spin-up motor which provides constant angular acceleration of the disc drive. Voltages at the ends of the windings of a spindle motor of the disc drive are sampled to detect the angular acceleration at which disc rotation relative to the heads begins, from which the static friction force and the kinetic friction force are determined. The angular acceleration of the disc drive is monitored through the sampling of velocity commands used to control the angular acceleration of the disc drive, or through the use of an accelerometer mounted with respect to the disc drive.

REFERENCES:
patent: 5539592 (1996-07-01), Banks et al.

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