Spindle motor for reduced size disk drive and method of making same
US5181148A · kind A · utility
8Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1990 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Jun 28, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spindle motor for two and one-half inch disks and three and one-half inch disks has a disk mounting surface with a horizontal tolerance of less than 30 micro inch to prevent warpage of a disk mounted thereon by pressure engagement. The disk mounting surface is machined to the requisite tolerance by mounting an assembled motor on a support surface of a rigid granite block table and spinning the rotor of the motor by an external drive. A cutting tool then machines the disk mounting surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.