Permanent magnet field DC machine
US4794291A · kind A · utility
15Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Mar 16, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K23/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet field DC machine comprises a rotor and a stator. The rotor comprises an armature core (3), an armature winding (4), and a commutator (2). The stator comprises a yoke (7), permanent magnets (8) disposed on the inner periphery of the yoke (7), and magnetic pole pieces (9) interposed between the yoke (7) and a portion of each magnetic pole (8). The magnetic pole pieces (8) are made of a material the permeability of which is greater than that of the permanent magnets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.