Patent ID: 8247933
Filing Date: 2012-08-21
Classification: H02K

Abstract:
1. A permanent magnet machine comprising: a stator body having a first end and a second end, and having a plurality of generally radial slots formed therein for accepting a set of windings having a first set of end-turns at the first end and a second set of end-turns at the second end; the stator body having a plurality of channels adjacent to the slots and extending from the first end of the stator body to the second end of the stator body, the channels configured to allow the flow of a cooling fluid therethrough; and a plurality of nozzles in fluid communication with the plurality of channels and configured to spray the cooling fluid onto the first and second set of end turns; a first end ring having a first set of ring cavities provided therein and configured to house a first set of the nozzles, the first end ring attached to the first end of the stator body such that the channels are in fluid communication with the first set of ring cavities; a second end ring having a second set of ring cavities provided therein and configured to house a second set of the nozzles, the second end ring attached to the second end of the stator body such that the channels are in fluid communication with the second set of ring cavities; and an inlet coupled to one of the first set of ring cavities, and an outlet coupled to one of the first or second set of ring cavities, wherein the cooling fluid is configured to flow from the inlet, through the channels, to the outlet; wherein the channels, the first set of ring cavities, and the second set of ring cavities are configured such that the cooling fluid may flow in a cylindrical serpentine pattern from the inlet to the outlet.