| 主权项 |
1. A rotor for an electric machine, the rotor comprising:
an axial air channel formed in the rotor configured to receive an airflow through an inlet port, the axial air channel being in fluid communication with a plurality of radial air channels, the axial air channel having a first cross-sectional area where the axial air channel is connected to a radial air channel of the plurality of radial air channels and a first choke portion in the axial air channel, the first choke portion having a second cross-sectional area that is less than the first cross sectional area and a second choke portion closer to an exit of the axial air channel than the first choke portion, the second choke portion having a third cross-sectional area that is greater than the second cross-sectional area such that varying portions of the airflow are provided to the radial air channel, the choke portions reducing the velocity of the airflow to eliminate flow separation from the axial air channel such that essentially even temperature distribution through the radial air channels is achieved. |
