Spindle drive system
US4197489A · kind A · utility
42Cited by
11References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1978 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Jan 27, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/186
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A floppy disk drive system employs an inside-out DC motor whose centrally located stator is mounted directly to the chassis. The motor has a tubular rotor that encircles the stator and it is supported co-axially with the stator by the rotary disk drive spindle. A timing and commutation disk is mounted directly on the rotor and, together with speed control and commutation networks, maintains uniform motor speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.