Rotor with hollow cylindrical permanent magnet
US5317227A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1992 |
| Grant date | May 31, 1994 |
| Priority date | — |
| Expiry date | Dec 8, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rotor for a dynamoelectric machine, without windings and rotatable about a central longitudinal axis, having an axially extending rotatable body and a toroidal magnet coaxially mounted on the body is constructed to provide magnetic exitation for the rotor. The rotatable body contains a first set of circumferentially spaced axially extending salient poles with circumferentially spaced recesses therebetween and a second set of similar poles at an opposite axial location. The toroidal magnet is coaxially mounted on the body between the first and second set of salient poles. A second toroidal magnet may also be mounted on the body and a magnetic spacer placed in between both toroidal magnets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.