AC generator with annular permanent magnets
US5132581A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1991 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Feb 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an AC generator having a plurality of claw-shaped magnetic pole portions in a rotor, a pair of projected portions which extend toward an outer circumference from both ends of boss portions on an outer circumference of a shaft are provided, and permanent magnets are also provided so as to abut against the projected portions so that magnetic flux is applied in the same direction as the magnetic flux applied to the projected portions when an electric current is applied to a field winding which is wound around the boss portions. With a magnetic path thus constructed, it is possible that the magnetic flux if permanent magnets is put on the magnetic flux produced by a field winding, thus applying much magnetic flux to the stator. As a result, the output per weight can be increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.