Dynamoelectric machine having coil windings and core encapsulated with resin-filler composition
US4128527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1977 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | Apr 13, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K3/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a dynamoelectric machine having a stator assembly of coil windings and a core, a heat-dissipating, electro-insulative housing encapsulates the coil windings and the core. The housing is made of a cured molded article or material formed of a resin-filler composition which comprises a liquid unsaturated polyester resin, a finely divided calcium carbonate powder, an inorganic mineral particulate having a particle size larger than that of the calcium carbonate powder, and a chopped glass fiber, wherein the ratio by weight of the calcium carbonate to the mineral particulate is 0.3 to 4, the ratio of the weight of glass fiber to the total weight of the composition is 0.05 to 0.25, the ratio of the weight of the polyester resin to the total weight of the composition is 0.1 to 0.4 and the weight ratio of the calcium carbonate powder, the mineral particulate and the glass fiber to the total weight of the composition is 0.6 to 0.9. The disclosure is also concerned with a dynamoelectric machine having a housing made of a cured article of a composition containing a certain amount of clay powder as a separation inhibitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.