Low noise ventilation system for electric motor
US7157818B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 2003 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Jan 4, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2205/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor having a fan and baffle for directing a flow of cooling air through the motor while minimizing generation of noise. The fan has blades which are curved in a direction opposite to the direction of rotation of the fan. The blades are spaced from a hub of the fan thereby forming a clearance region to inhibit air flow shear and turbulence. The baffle has an annular shape with upstream and downstream faces for directing air flow. The downstream face is inclined so that air flowing along its surface has a component of motion in the downstream direction to inhibit separation of flow from the surface. The baffle is received in a casing of the motor with a slip fit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.