Alternator stator having a multiple filar construction to improve convective cooling
First Claim
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1. A stator for a dynamoelectric machine, comprising:
- a stator core having a generally cylindrical shape, the stator core having a plurality of circumferentially spaced slots, a stator winding including a plurality of conductors, each conductor having a plurality of straight segments interconnecting a plurality of end loop segments;
the plurality of conductors organized into at least a first filar and a second filar, the plurality of conductors organized into multiple phases defined by a circumferential pitch, each phase having a conductor in the first filar and a conductor in the second filar;
the plurality of conductors organized into layers, each layer representing a set of equidistant radial positions in the slots filled by the straight segments of the conductors;
the end loop segments of the first and second filars being circumferentially aligned and axially opposite each other;
the straight segments of corresponding conductors of the first and second filars residing in common slots in the stator core;
the straight segments of one phase being positioned in the same layer as adjacent straight segments in the adjacent phase; and
the plurality of conductors arranged in a cascading structure defined by at least three consecutive straight segments of one turn of one conductor residing in a common layer.
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Abstract
A stator for a dynamoelectric machine improves the cooling of the stator winding without increasing the size of the stator winding or the entire stator. The stator is of a unique construction wherein the size, and more specifically the cross sectional area or volume of the individual conductors is greatly reduced, while the total number of conductors is increased. In addition, a multiple filar construction is employed to avoid the potential for high levels of inductance and resistance in the conductors and to minimize the interference between the cascaded stator end loops and the housing that surrounds the stator.
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Citations
28 Claims
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1. A stator for a dynamoelectric machine, comprising:
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a stator core having a generally cylindrical shape, the stator core having a plurality of circumferentially spaced slots, a stator winding including a plurality of conductors, each conductor having a plurality of straight segments interconnecting a plurality of end loop segments;
the plurality of conductors organized into at least a first filar and a second filar, the plurality of conductors organized into multiple phases defined by a circumferential pitch, each phase having a conductor in the first filar and a conductor in the second filar;
the plurality of conductors organized into layers, each layer representing a set of equidistant radial positions in the slots filled by the straight segments of the conductors;
the end loop segments of the first and second filars being circumferentially aligned and axially opposite each other;
the straight segments of corresponding conductors of the first and second filars residing in common slots in the stator core;
the straight segments of one phase being positioned in the same layer as adjacent straight segments in the adjacent phase; and
the plurality of conductors arranged in a cascading structure defined by at least three consecutive straight segments of one turn of one conductor residing in a common layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A stator for a dynamoelectric machine, comprising:
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a stator core having a generally cylindrical shape, the stator core having a plurality of circumferentially spaced core slots;
a stator winding including a plurality of conductors extending through the core slots, each conductor having a plurality of straight segments interconnecting a plurality of end loop segments;
the plurality of conductors organized into multiple phases, each phase having multiple filars, each filar of each phase being electrically connected to corresponding filars in each phase;
the plurality of conductors organized into layers, each layer representing a set of equidistant radial positions in the slots filled by the straight segments of the conductors;
the plurality of conductors being arranged in a cascading structure defined by at least three consecutive straight segments of one turn of one conductor residing in a common layer; and
each phase having conductors with straight segments residing in a common layer with straight segments of conductors of the other phases. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification