Unidirectional self-starting electrical motors with shaded poles and shaded magnetic shunt
US4012652A · kind A · utility
14Cited by
7References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1974 |
| Grant date | Mar 15, 1977 |
| Priority date | — |
| Expiry date | Apr 24, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A unidirectional self-starting synchronous motor comprises a stator having pole teeth of alternating polarity some of which are shaded to provide shaded pole groups alternating with unshaded pole groups. The shaded groups are angularly displaced from a symmetrical position. The total number of effective poles equals the theoretical synchronous number and these are poles divided substantially evenly between the groups. In one case, a shaded shunt is provided as an addition to the shaded groups and a rotor is provided from radially-polarized, anisotropic, ferrite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.