Process for impregnating electrical coils, and selected epoxy composition for carrying out the impregnation
US6555601B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1999 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Dec 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B3/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A process for impregnating an electrical coil which comprises a winding comprising two or more layers consisting of more than one turn of an electrically conducting wire-form material with a polymer material which electrically insulates the individual turns of the wire-form material from one another with the aid of a thermally curable epoxy resin composition, which composition is solid at room temperature and comprises the following constituents:(a) an epoxy resin which is solid at room temperature, selected from(a1) polyglycidyl ethers based on novolaks;(a2) diglycidyl ethers based on bisphenols, and(a3) mixtures of more than one of components (a1) and (a2);(b) a crosslinking agent for component (a);(c) a suitable accelerator for the reaction of component (a) and component (b);(d) from 15 to 70 percent by weight, based on the overall weight of the composition, of filler selected from(d1) calcium carbonate,(d2) quartz flour,(d3) wollastonite whose particles have an average ratio of length to cross-section which is less than 5:1;(d4) mixtures of components (d1), (d2) and (d3) and(d5) mixtures of components (d1), (d2), (d3) and (d4) with other inorganic fillers; and which also prefer…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.