Title: Spindle drive motor

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.

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Inventors: Bleiman, Lewis William (Northridge, CA, US)

Application Number: 522220
Filing Date: 1974-11-08
Publication_date: 1976-08-03
Assignee: Pertec Corporation (Chatsworth, CA)
Primary Class(es): 369/266 310/49R, 318/696, 369/261
Other Classes:
US Patent Ref:

1963669	Jun, 1934	Murphy	274/1.
2790124	Apr, 1957	Eisele	310/49.
3280398	Oct, 1966	Marie	310/49.
3343014	Sep, 1967	Giles	310/49.
3369227	Feb, 1968	Boissevain	274/39.
3411058	Nov, 1968	Madsen et al.	318/696.
3683248	Aug, 1972	Kobayashi et al.	274/39.
3706085	Dec, 1972	Mowrey et al.	274/39.
3768815	Oct, 1973	Mathurin	346/137.
3801891	Apr, 1974	Davenport	310/49.
3818261	Jun, 1974	Clark, Jr.	318/696.

Other Refs:
Primary Examiner: Rothberg, Samuel B.
Assistant Examiner: Stearns, Richard R.
Attorney: Lindenberg, Freilich, Wasserman, Rosen & Fernandez