Varistor in an electric motor
US5095239A · kind A · utility
13Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1989 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Nov 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a fractional horsepower PMDC motor a varistor comprises an annular ring of varistor material having a heat sink bonded to one face. The heat sink includes a plurality of fan blades and is attached to a commutator of the motor. The heat sink increases the thermal capacity of the varistor to resist overheating under stall conditions and improves heat dissipation when the motor is running.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.