Homopolar dynamoelectric machine with a shielded stator excitation coil
US4581555A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1984 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Dec 3, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K31/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drum-type homopolar dynamoelectric machine includes a rotor and an annular field coil encircling a portion of the rotor. The field coil is supported by a stator structure having a main pole piece for directing magnetic flux produced by current flowing in the coil, radially into a section of the rotor. A current transfer assembly makes sliding electrical contact with a current collecting zone on the surface of the rotor and is axially positioned between the main pole piece and an end pole piece of the stator which directs magnetic flux axially out of the end of the rotor. A magnetic flux shield is positioned adjacent to the field coil to minimize leakage flux, caused by current flowing in the field coil, in the vicinity of the current collecting zone of the rotor. This reduces undesirable circulating currents in the rotor current collecting zone and the associated current collecting brushes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.