Vehicle AC generator stator

Details Vehicle AC generator stator Vehicle AC generator stator

1999-11-16

2001-01-30

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S180000, C310S184000, C310S049540, C029S596000

Reexamination Certificate

active

06181044

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 10-335639 filed on Nov. 26, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vehicle AC generator stator, and particularly a stator winding arrangement.
2. Description of the Related Art
PCT application WO92/06527 discloses a stator winding arrangement, which is composed of U-shaped conductor segments welded to one another at their connection ends. The connection ends are disposed in a circular layer at one end of the stator core at equal intervals. Each U-shaped conductor segment has two in-slot portions inserted into a pair of slots, and four in-slot portions are disposed in each slot. Accordingly, four connection ends extend from each slot to be welded to form a stator winding. Because all the connection ends are aligned in the circular layer, the interval between welded junctions of the connection ends becomes so small that insulation between the junctions becomes difficult, and that cooling air can not pass therethrough very well.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved stator having a stator winding composed of a plurality of conductor segments.
Another object of the invention is to provide an improved stator winding composed of a plurality of conductor segments welded to one another at connection ends that are sufficiently spaced apart from one another.
According to a preferred embodiment of the invention, each of a plurality of conductor segments of a stator winding includes an in-slot portion and an inclined coil-end portion having a connection-end positioned in a circular layer corresponding to a slot-layer. The connection-end in one of a plurality of circular layers is connected to another connection-end in an adjacent circular layer to form a junction radially and circumferentially spaced apart from other junctions. Each of the segments can have another connection-end positioned in a circular layer at the opposite core end corresponding to the slot layer.
More specifically, a stator winding comprises a plurality of sets of U-shaped large and small segments including a pair of in-slot portions each disposed in one of a plurality of radially aligned slot-layers and contiguous inclined coil-end portions each having a connection-end. The pair of in-slot portions of the large segment is disposed in a pair of the slots one-pole pitch spaced apart from each other so that one in-slot portion is disposed in the innermost slot-layer of one of the pair of slots and the other in-slot portion is disposed in the outermost slot-layer. One of the connection-ends of the large segment is positioned in the innermost circular layer corresponding to the innermost slot-layer formed at an end of the stator core, and the other of the connection-ends is positioned circumferentially spaced apart from the one of the connection ends in the outermost circular layer corresponding to the outermost slot-layer. The pair of in-slot portions of the small segment is disposed in the pair of the slots so that one in-slot portion is disposed in the inner middle slot-layer of one of the pair of slots and the other in-slot portion is disposed in the outer middle slot-layer. One of the connection-ends of the small segment is positioned in the inner middle circular layer corresponding to the inner middle slot-layer to be in contact with the coil-end of the large segment positioned in the innermost circular layer to form an inner junction, and the other of the connection-ends is positioned circumferentially spaced apart from the one of the connection ends in the outer middle circular layer corresponding to the outer middle slot-layer to be in contact with the coil-end of the large segment positioned in the outermost circular layer to form an outer junction.


REFERENCES:
patent: 2407935 (1946-09-01), Perfetti et al.
patent: 4238702 (1980-12-01), Belova et al.
patent: 4833356 (1989-05-01), Bansai et al.
patent: 59-111482 (1984-07-01), None
patent: 92/06527 (1992-04-01), None
patent: 98/54823 (1998-12-01), None

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