Rotary electric machine having reduced winding
First Claim
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1. A rotary electric machine comprising:
- a stator core having a plurality of slots;
a poly-phase stator winding positioned on said stator core; and
a rotor, wherein said stator winding has a cross section to be disposed in said slots and to form a plurality of layers in said slots, and wherein said plurality of slots includes occupied slots and at least one unused slot, and wherein at least one space vacant layer is located in the occupied slots.
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Abstract
A stator core of rotary electric machine has a plurality of slots. The slots are fully occupied by a stator winding to provide maximum output. On the other hand, to provide reduced output, empty unused slots are located alternately along a circumferential direction. The stator winding is only accommodated in the fully occupied slots. Therefore, rotary electric machines having different performances are provided without a drastic design change of the stator core.
56 Citations
18 Claims
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1. A rotary electric machine comprising:
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a stator core having a plurality of slots;
a poly-phase stator winding positioned on said stator core; and
a rotor, wherein said stator winding has a cross section to be disposed in said slots and to form a plurality of layers in said slots, and wherein said plurality of slots includes occupied slots and at least one unused slot, and wherein at least one space vacant layer is located in the occupied slots. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A rotary electric machine comprising:
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a stator core having a plurality of slots;
a ploy-phase stator winding positioned on said stator core; and
a rotor, wherein said stator winding has a plurality of U-shaped conductor segments joined each to other at the ends thereon, wherein each of said U-shaped conductor segments has both ends located on one side of said stator core and a turn portion located on another side of said stator core, wherein said U-shaped conductor segments include first U-shaped conductor segments and second U-shaped conductor segments, said both ends of said first U-shaped conductor segments are disposed on an outer most layer and an inner most layer at said one side of said stator core, said both ends of said second U-shaped conductor segments are disposed on an outer middle layer and an inner middle layer at said one side of said stator core, wherein each of said plurality of slots has one of said first and second U-shaped conductor segments such that the first and second U-shaped conductor segments are alternately disposed on said plurality of slots with respect to a circumferential direction, wherein said outermost layers and said outer middle layers are joined to form a plurality of joints arranged in a ring, and p1 wherein said innermost layers and said inner middle layers are joined to form a plurality of joints arranged in a ring. - View Dependent Claims (11)
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12. A rotary electric machine comprising:
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a rotor providing N and S magnetic poles alternately along a rotational direction;
a stator having a stator core disposed opposite to said rotor and a poly-phase stator winding positioned on said stator core, wherein said stator core has a laminated core formed with a plurality of slots extending to penetrate laminated sheets of said laminated core, wherein said slots include a first slot in which said stator winding is disposed and a second slot in which said stator winding is not disposed, and wherein a plurality of said first slots and second slots are disposed alternately along a circumferential direction of said stator core. - View Dependent Claims (13, 14, 15, 16, 17, 18)
wherein each of said conductor segments has partial portions extending from both axial sides of said slots, wherein said partial portions of said conductor segment forms a coil end connecting in series between different layers in two of said slots which are spaced apart from each other corresponding to an N and S magnetic pole pitch on said rotor, and wherein a plurality of said coil ends are disposed to form gaps in which a cooling medium flows. -
16. A rotary electric machine according to claim 12, wherein said stator winding in said slot s has a cross section similar to a rectangular shape corresponding to a shape of said slot.
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17. A rotary electric machine according to claim 12, wherein said second slot is closed at a radial inside of said stator core.
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18. A rotary electric machine according to claim 12, wherein said first slot and said second slot has different widths along a circumferential direction respectively.
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Specification