Electric machine having a cooled rotor shaft
US9148041B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 2014 |
| Grant date | Sep 29, 2015 |
| Priority date | — |
| Expiry date | May 5, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K9/19
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric machine (1) has a hollow rotor shaft (3) and a stationary cooling lance (13) that penetrates the hollow shaft (3) axially. The cooling lance (13) has an inlet (16) and an outlet (17) for a cooling medium. A cooling duct (18) penetrates the cooling lance (13) axially and is connected to the inlet (16) and the outlet (17) for guiding the cooling medium through the cooling lance (13). The cooling lance (13) also has an inlet (24) and an outlet (25) for oil. An oil duct (26) penetrates the cooling lance (13) axially and is connected to the oil inlet (24) and outlet (25) for guiding the oil through the cooling lance (13). The outlet (25) for the oil is connected to an annular space (27) between the cooling lance (13) and the rotor shaft (3). The annular space (27) has an opening (28) for the oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.