Automatic velocity calibrator for a velocity servo loop in a mag

Details Automatic velocity calibrator for a velocity servo loop in a mag Automatic velocity calibrator for a velocity servo loop in a mag

1982-12-14

1984-10-30

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With stabilizing features

318561, 360 77, G05B 501

Patent

active

044802170

ABSTRACT:
An automatic velocity calibrator for a head positioning servo system in a magnetic disk drive performs a velocity calibration in a single pass over the magnetic disks by measuring actuator velocity and adjusting the gain of the velocity transducer in a series of successive approximations. Velocity is determined by turning a timer on in response to a track crossing and turning the timer off after at least two successive track crossings have been detected. A plurality of velocity measurements are stored and averaged. The average velocity is compared to a constant velocity command and an 8-bit latch is incremented or decremented in response to this comparison. A digital to analog converter produces a reference for an automatic gain control amplifier in the servo system which in turn adjusts the velocity transducer gain.

REFERENCES:
patent: 3699555 (1972-10-01), Du Vall
patent: 4031443 (1977-06-01), Droux
patent: 4134053 (1979-01-01), Klinger
patent: 4166970 (1979-09-01), Cardot et al.
patent: 4168457 (1979-09-01), Rose
patent: 4200827 (1980-04-01), Oswald
patent: 4321517 (1982-03-01), Touchton et al.
patent: 4379256 (1983-04-01), Maury
patent: 4383207 (1983-05-01), Maury

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