Stator winding of vehicle AC generator

Details Stator winding of vehicle AC generator Stator winding of vehicle AC generator

1999-09-29

2001-04-24

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S180000, C310S201000

Reexamination Certificate

active

06222295

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 10-288188, filed Oct. 9, 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 for a vehicle and, particularly, a stator winding of such an AC generator.
2. Description of the Related Art
PCT application 92/06527 discloses a stator winding composed of a plurality of U-shaped conductor segments welded together. Such conductor segments have various turn portions having a different radius of curvature. Therefore, it is necessary to select coating material that is resistive to the most severe conditions such as stress applied while such conductor segments are formed by bending or high temperature generated while the stator winding is generating output power. However, the ratio of the insulation material to the production cost of such conductor segments is considerably high.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved stator winding composed of a plurality of reliable conductor segments of high insulation performance which can be manufactured at a low production cost.
In a preferred embodiment of the invention, a stator winding of an AC generator includes a plurality of sets of first and second conductor segments disposed in slots of a stator and connected to form the stator winding. Each of the first conductor segments includes a turn portion having a large radius of curvature disposed at an axial end of the stator core, and each of the second conductor segments includes a turn portion having a small radius of curvature disposed at an axial end. That is, the turn portion of the second conductor segments has a smaller radius of curvature than the radius of curvature of the turn portion of the first conductor segments. The preferred embodiment has a feature in that the second conductor segments have stronger insulation coating than the first conductor segments, thereby improving insulation performance.
The first and second conductor segments may have stronger insulation coating at portions under higher temperature than other portions. The stronger insulation coating of the small U-turn portion can be provided by thicker coating than the coating of the large U-turn portion.


REFERENCES:
patent: 1826295 (1931-10-01), Apple
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patent: 3860744 (1975-01-01), Schuler
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patent: 5982068 (1999-11-01), Umeda et al.
patent: 5986375 (1999-11-01), Umeda et al.
patent: 5986380 (1999-11-01), Kaminski et al.
patent: 881746 A2 (1998-12-01), None
patent: 881747 A2 (1998-12-01), None
patent: 92/06527 (1992-04-01), None

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