Permanent magnet generator with output power adjustment by means of magnetic shims
US4025840A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1975 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | Apr 9, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/028
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The instant invention relates to a simple arrangement for adjusting the output power of one or more selected windings of a multiple winding, single phase Permanent Magnet Generator (PMG) without changing the magnetization of the rotor and without modifying the main stator magnetics. Magnetic shims are inserted selectively into one or more of the stator slots and shunt increasing amounts of flux as load current increases, thereby reducing the output of the selected windings without in any way affecting the output of the remaining windings. Alternatively, such magnetic shims may be used to adjust the output of single phase, single winding PMG's that have rotors made of Rare Earth Cobalt permanent magnets which, unlike conventional magnets, cannot be demagnetized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.