AC Generator having a clawtooth rotor with irregular trapizoidal teeth
US4201930A · kind A · utility
21Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1978 |
| Grant date | May 6, 1980 |
| Priority date | — |
| Expiry date | Jul 7, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A polyphase AC generator of a type designed for installation in automobiles, has a so-called Lundell type rotor in which an exciting coil is enclosed by a plurality of pairs of finger type magnetic poles and which is rotated by a vehicle-mounted engine. The shape of the finger magnetic poles is modified to an irregular trapezoidal shape having a side opposite to a base displaced with respect to said base in the direction of rotation of the rotor, thus changing the waveform of magnetic flux flowing through the rotor and an armature core and thereby reducing magnetic noise of the generator under load operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.