Electric motor having internal heat dissipator
US5394040A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1993 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Sep 7, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K9/225
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A heat dissipator for an electric motor includes an impeller having an internal heat transfer mechanism. The heat transfer mechanism provides efficient heat transfer from the motor armature to the surrounding environment without forcing cooling fluids into the motor and without transferring heat through the motor housing. The motor can therefore be encased in sealed, light-weight plastic motor housing having relatively poor heat transfer characteristics without danger of overheating. The impeller is preferably designed to displace fluids without turbulence, thereby reducing noise and increasing efficiency. To this end, the impeller employs annular disks stacked on a shaft which may be rotatably mounted in a specially shaped housing and which preferably is formed from an extension of the motor drive shaft. The disks and a complementary surface cooperate so as to use a combination of surface friction, centrifugal forces, and a venturi effect to propel fluids without turbulence. This type of impeller is also preferred because it is sufficiently compact to be attachable to a conventional motor without prohibitively increasing the size of the overall system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.