Randomized motor drive

Details Randomized motor drive Randomized motor drive

1982-05-17

1988-02-09

Weldon, Ulysses

Electricity: motive power systems

Motor-reversing

Field circuit control

318327, 318461, H02K 2720

Patent

active

047243660

ABSTRACT:
The circuit provides damping for digitally controlled devices where the provision of power pulses in response to sensing a given device parameter may result in a regularity of pulses that causes a resonant condition with a frequency that interferes with other device functions or induces error conditions. The circuit shown randomizes to a motor by random gating of a sequence of commands retained in a shift register. Random gating from the shift register positions occurs through the use of a counter driven by an oscillator, independent of other device functions and clocking circuits, in conjunction with an enabling circuit from a random digitized data source that enables or disables counter advance by the oscillator. In the disk drive environment shown, randomizing has no significant effect on the closely regulated speed since the corrective commands occur during each sector of revolution or about thirty-six hundred times per second and motor rotational inertia precludes any meaningful change during a sector rotation.

REFERENCES:
patent: 3176208 (1965-03-01), Gifft
patent: 3858100 (1974-12-01), Bussi et al.
patent: 3895486 (1975-07-01), Hammer et al.
patent: 3950682 (1976-04-01), Dohanich
patent: 4007605 (1977-02-01), Denny
patent: 4015182 (1977-03-01), Erdman
patent: 4375609 (1983-03-01), Wolf

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