Dynamoelectric machine rotor ventilation
US6552452B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 19, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Nov 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dynamoelectric machine has a stator member, a rotor member, a first shroud and a second shroud. The first shroud and the second shroud members are mounted to the rotor adjacent respective first and second end portions of the rotor for rotation with the rotor. The first and second shrouds extend radially over and are spaced from the respective radially extending first and second end portions of the rotor to respectively define radial inlet and outlet paths therewith. The first and second shrouds each have a first radially inner end adjacent and spaced from the shaft to define a gas inlet or outlet, respectively, and a second radial outer end mounted to the rotor adjacent and spaced apart the ventilation ducts for communicating gas between the ventilation ducts and the inlet and outlet paths. The second outlet shroud is spaced further from the shaft than the inlet shroud so as to facilitate the gas flowing in the inlet shroud and out the outlet shroud during normal machine operation. Fan motors are provided at the inlet and outlet of the shrouds to direct gas flow. The present invention provides for an improvement in windage loss by angularly accelerating the gas prior to entering …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.