Tape drive capstan motor servo system with static friction compe

Details Tape drive capstan motor servo system with static friction compe Tape drive capstan motor servo system with static friction compe

1992-09-24

1994-07-05

Ip, Paul

Electricity: motive power systems

Positional servo systems

With compensating features

318603, 318560, 318561, 318630, H02P 128, H02P 130

Patent

active

053270592

ABSTRACT:
A system and apparatus for startup and speed regulation of low-inertia capstan motors under circumstances where the capstan load during startup may vary widely. A stiction handler provides dynamic control of the motor drive voltage imposed to overcome stationary friction, minimizing the power consumption on startup independently of variations in drag load or motor inertia. A stepped speed-up signal is applied to the motor instead of a conventional constant current-limited signal or sawtooth ramp signal. Motor speed regulation is imposed at each step of a stepped speed-up drive signal. This invention is particularly useful, for example, in low-power magnetic tape drives that must efficiently adapt to variations in drag between one tape cassette or cartridge and another.

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patent: 5079493 (1992-01-01), Futami et al.
patent: 5204602 (1993-04-01), Iwashita

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