Field magnet for miniature motors
US5206556A · kind A · utility
19Cited by
14References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1991 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Mar 1, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/17
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A field magnet for miniature motors of a type having a stator comprising a field magnet fixedly fitted to a motor housing, an end plate fitted to an open end of the motor housing; an a rotor comprising a rotor winding wound on a rotor core; electric current being fed to the rotor winding via a commutator making sliding contact with current feeding brushes that are held by brush holders fixedly fitted to the end plate; in which cogging during motor rotation is reduced to make motor rotation smooth by forming a magnet that has at the magnetic poles thereof higher maximum magnetic energy product than any other regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.