Spindle drive motor

Details Spindle drive motor Spindle drive motor

1974-11-08

1976-08-03

Rothberg, Samuel B.

Undertaking

310 49R, 318696, G11B 0360, H02K 3700

Patent

active

039725359

ABSTRACT:
A system for driving a flexible magnetic disk including a direct current stepper motor having a shaft directly connected to the disk drive hub. Motor controller means activate the motor to bring it from rest up to a desired speed, e.g., 360 rpm, and thereafter maintain the speed constant. The motor controller initially provides a detent pulse to move the rotor to a starting position and then provides pulses of decreasing duration and increasing frequency to accelerate the motor to the desired speed.

REFERENCES:
patent: 1963669 (1934-06-01), Murphy
patent: 2790124 (1957-04-01), Eisele
patent: 3280398 (1966-10-01), Marie
patent: 3343014 (1967-09-01), Giles
patent: 3369227 (1968-02-01), Boissevain
patent: 3411058 (1968-11-01), Madsen et al.
patent: 3683248 (1972-08-01), Kobayashi et al.
patent: 3706085 (1972-12-01), Mowrey et al.
patent: 3768815 (1973-10-01), Mathurin
patent: 3801891 (1974-04-01), Davenport
patent: 3818261 (1974-06-01), Clarke, Jr.

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