Winding end turn cooling in an electric machine
First Claim
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1. An electric machine comprising:
- a stator;
a plurality of winding end turns that are mounted to the stator and are generally axisymmetric with respect to one another, with interspaces between pairs of adjacent winding end turns, the winding end turns each defined by layers of winding, with spaces between the layers of each said winding end turn tangentially oriented relative to the machine, the spaces of each of the winding end turns communicating with the interspaces on opposite side of the winding end turn;
a plurality of coolant input paths, each communicating with a source of coolant and each defined in one of the interspaces extending radially relative to a center of the electric machine and between a corresponding pair of the winding end turns;
a plurality of internal coolant paths defined tangentially relative to the machine, each internal coolant path substantially extending at least through said spaces defined between the layers of a corresponding one of the winding end turns and communicating with a corresponding one of the coolant input paths; and
a plurality of coolant output paths, each communicating with a corresponding pair of the internal coolant paths.
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Abstract
Winding end turns in an electric machine are cooled by a coolant. Cooling is improved by redirecting the coolant generally tangentially through the winding end turns to improve heat transfer between coolant and windings.
48 Citations
12 Claims
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1. An electric machine comprising:
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a stator; a plurality of winding end turns that are mounted to the stator and are generally axisymmetric with respect to one another, with interspaces between pairs of adjacent winding end turns, the winding end turns each defined by layers of winding, with spaces between the layers of each said winding end turn tangentially oriented relative to the machine, the spaces of each of the winding end turns communicating with the interspaces on opposite side of the winding end turn; a plurality of coolant input paths, each communicating with a source of coolant and each defined in one of the interspaces extending radially relative to a center of the electric machine and between a corresponding pair of the winding end turns; a plurality of internal coolant paths defined tangentially relative to the machine, each internal coolant path substantially extending at least through said spaces defined between the layers of a corresponding one of the winding end turns and communicating with a corresponding one of the coolant input paths; and a plurality of coolant output paths, each communicating with a corresponding pair of the internal coolant paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electric machine comprising:
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a stator; a plurality of winding end turns mounted to the stator and being generally axisymmetric with respect to one another, with interspaces between pairs of adjacent winding end turns, the winding end turns each defined by layers of winding, with spaces between the layers of each said winding end turn tangentially oriented relative to the machine, the spaces of each of the winding end turns communicating with the interspaces on opposite side of the winding end turn; means for distributing coolant between pairs of adjacently-disposed winding end turns formed by the winding end turns of the machine; means for directing the coolant from between the pairs of winding end turns tangentially relative to a center of the machine through spaces defined between layers of the corresponding winding end turns of each pair; and means for redirecting the tangential flow of coolant exiting the winding end turns to an outlet. - View Dependent Claims (10, 11, 12)
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Specification