AC generator stator for vehicle

Details AC generator stator for vehicle AC generator stator for vehicle

1999-09-03

2001-03-13

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S179000, C310S180000, C310S201000, C310S206000, C310S207000

Reexamination Certificate

active

06201332

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 10-252816, filed Sep. 7, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an AC generator driven by an internal combustion engine, which can be mounted in a vehicle such as a passenger car, a truck or the like.
2. Description of the Related Art
It is well known that a plurality of U-shaped conductor segments are connected at the open ends thereof to form a phase winding of a multi-phase stator winding of an AC generator for a vehicle as is disclosed in International Publication Number WO 92/06527 (1992). The connected open-end portions (hereinafter referred to as the connected portions) of the conductor segments are disposed at one axial end of a stator core to be soldered or welded. Four conductor segments are respectively inserted in slots of a stator to form a four-turn one-phase winding. In this conventional structure, many specific segments are necessary to connect the four windings together, and to provide a pair of output terminals. That is, five specific segments are required to form a four-turn-one-phase winding, and 15 specific segments are required for a three-phase four-turn stator winding.
SUMMARY OF THE INVENTION
Therefore, a main object of the present invention is to provide a vehicular AC generator stator which has a stator winding which does not as many specific segments as the conventional stator.
Another object of the present invention is to provide a vehicular AC generator having a stator winding free from the interference of conductor segments.
Another object of the present invention is to provide a vehicular AC generator having coil ends in which the distance between the connected portions of segments is kept to be suitable for automatic winding.
In an alternator stator for a vehicle according to an embodiment of the present invention, each of the plurality of phase-windings is composed of a lap winding unit having a plurality of lap-wound coils and a wave winding unit having a plurality of wave-wound coils, and the lap winding unit and the wave winding unit respectively have a plurality of conductor members disposed in the same one of the slots. As a result, a limited number of types of basic conductor segments are connected to form a stator winding by a limited number of connection segments that are derived or formed from the basic conductor segments.
In the alternator stator, the number of the conductor members in the same one of the slots can be expressed as (4n+2), where n is a natural number. In the alternator stator, each phase-winding preferably has a first coil-end group in which the conductor members overlap with one another at an axial end of the stator core and a second coil-end group in which the conductor members are connected to provide both the lap-wound coils and the wave-wound coils.
It is more preferable that each of the plurality of phase windings includes a plurality of U-shaped segments having a pair of the conductor members and an integral turn portion which is disposed in the first coil-end group, and the conductor members are welded in the second coil-end group.
It is further preferable that the conductor members are disposed in the slot to be aligned radially, and one of the conductor members disposed in the radially outermost layer is connected, in the first coil-end group, to another of the conductor members disposed in the radially innermost layer in another slot spaced apart therefrom in one circumferential direction, and is connected, in the second coil-end group, to another of the conductor members disposed in the layer adjacent to the radially outermost layer in another slot spaced apart therefrom in the other circumferential direction.


REFERENCES:
patent: 1822261 (1931-09-01), Apple
patent: 1826295 (1931-10-01), Apple
patent: 4402129 (1983-09-01), Kreuzer et al.
patent: 4707629 (1987-11-01), Wasko
patent: 5097167 (1992-03-01), Kanayama et al.
patent: 5225729 (1993-07-01), Yang
patent: 5449962 (1995-09-01), Shichijyo et al.
patent: 92/06527 (1992-04-01), None

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