Commutator
US5266860A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Mar 17, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R43/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A commutator has a central support supporting a plurality of conductive segments separated by a plurality of insulative segments. In addition to providing an insulative function between the conductive segments, the dielectric constant, the area, and the thickness of the insulative segments are chosen so that they provide a capacitive effect, which capacitive effect suppresses current peaks during operation of the commutator. Preferably, the dielectric constant is greater than 10. The central support may include a metal shaft and an insulating ring, which insulating ring is preferably of material with a lower dielectric constant thereby to suppress-shorting between the shaft and the conductive segments. It is particularly advantageous if the conductive and insulative segments are of ceramics material since this provides good wear resistance. In further alternatives, capacitors are formed between the conductive segments by rings or other bodies of insulative materials of a suitably high dielectric constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.