Spindle drive motor
US3972535A · kind A · utility
14Cited by
11References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Nov 8, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.