| 主权项 |
1. A liquid-cooled rotary electric machine comprising:
a stator having a central axis; a rotor surrounded by the stator and having rotation relative to the stator about the central axis; a generally cylindrical jacket having opposite axial ends and an interior volume in which the stator and rotor are located, the jacket surrounding and in conductive thermal communication with the stator, the jacket defining a radially outer heat transfer surface relative to the central axis; and a fluid channel traversing the heat transfer surface, the fluid channel defining a flow path for liquid coolant through the machine and having first and second fluid channel portions, the first fluid channel portion extending about the central axis and progressing in a direction parallel to the central axis, the first fluid channel portion having opposite ends respectively defining a fluid channel entry and a fluid channel exit between which the fluid channel extends; wherein the first and second fluid channel portions are interconnected at spaced locations along the first fluid channel portion, one of the spaced interconnection locations being proximate one of the fluid channel entry and exit, and the heat transfer surface includes a zone which the first fluid channel portion does not traverse, the zone located between a jacket axial end and the first fluid channel portion, the second fluid channel portion extending into the zone between its interconnections to the first fluid channel portion, whereby the zone is traversed by the second fluid channel portion and heat is convectively transferable from the zone to liquid coolant along the flow path. |
