Tachometer for deriving average velocity output by sampling posi

Details Tachometer for deriving average velocity output by sampling posi Tachometer for deriving average velocity output by sampling posi

1980-02-11

1982-05-11

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 318618, 318653, G11B 1914, G11B 2108

Patent

active

043297218

ABSTRACT:
A tachometer for generating a velocity signal in a data disc pack servo system comprising a sampling pulse generator for producing pulses that are spaced from one another by a constant amount representative of a distance increment of radial movement of a servo head in the system, a timer for measuring the time between the sampling pulses, the timer including a clock pulse source and a counter which is started by one sampling pulse and reset by the next succeeding sampling pulse so that the digital output thereof is proportional to time and a computer for computing average velocity by deriving the quotient of the distance increment divided by the time required for the servo head to traverse such distance increment.

REFERENCES:
patent: 3820712 (1974-06-01), Oswald
patent: 3883894 (1975-05-01), Johnson
patent: 4134053 (1979-01-01), Klinger
patent: 4168457 (1979-09-01), Rose
patent: 4184108 (1980-01-01), Sordello et al.
patent: 4217612 (1980-08-01), Matla et al.
IBM Tech. Disc. Bull., D. E. Brownback et al., Measuring and Adjusting Speed of Magnetic Disk Access Arm, vol. 19, No. 7, Dec. 1976, pp. 2686-2687.
IBM Tech. Disc. Bull., G. B. Fisher, Disk Accessing System, vol. 19, No. 3, Aug. 1976, pp. 1103-1104.
IEEE Transactions on Magnetics, vol. Mag.-11, No. 5, Sep. 1975, pp. 1245-1246, R. K. Oswald, An Electronic Tackometer for Disk File Motion Control.

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