Brushless D.C. dynamoelectric machine with decreased magnitude of pulsations of air gap flux
US4710667A · kind A · utility
65Cited by
5References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1986 |
| Grant date | Dec 1, 1987 |
| Priority date | — |
| Expiry date | Aug 11, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K23/54
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dynamoelectric machine which may operate in a motor mode or a generator mode is described wherein substantially the entire magnetic circuit is provided by ferrite material. In one particular embodiment, hard ferrite permanent magnet segments are mounted on a rotor plate while soft ferrite magnet segments with electrical coil windings mounted thereon are provided in a stator spaced apart from the rotor by an air gap. Other embodiments of the concept are described. Provision is made for decreasing mechanical vibration and audible noise by decreasing the magnitude of pulsations of air gap flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.