Magnetic disc apparatus

Details Magnetic disc apparatus Magnetic disc apparatus

1976-09-13

1978-05-16

Schaefer, Robert K.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

H02P 304

Patent

active

040901173

ABSTRACT:
In a magnetic disc apparatus of contact-start-stop type, when stopping the rotation of a disc, a brake is placed into operation at the beginning of contact of a magnetic head with a disc at which the number of revolutions of the disc is decreased following turning off of a power source for motor drive. The actuation of an armature of the brake is delayed through the use of a current generated by an inertia rotation of a motor. Thus, wasteful actuation of the brake while the motor is rotating at a high speed is inhibited thereby extending the lifetime of the brake.

REFERENCES:
patent: 2183724 (1939-12-01), Schroder
patent: 2503438 (1950-04-01), Gruner
patent: 2989675 (1961-06-01), Lowe

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