Stator arrangement of vehicle AC generator

Details Stator arrangement of vehicle AC generator Stator arrangement of vehicle AC generator

1999-11-19

2001-03-20

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S180000, C310S184000, C310S201000, C310S260000

Reexamination Certificate

active

06204586

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from the following Japanese Patent Applications: Hei 10-334386, filed Nov. 25, 1998; Hei 11-214031, filed Jul. 28, 1999; and Hei 11-292607, filed Oct. 14, 1999; the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary electric machine, and particularly to a stator lead-wire arrangement of an AC generator for a vehicle.
2. Description of the Related Art
Both star-connected phase-windings and delta-connected phase-windings are known as typical phase-windings of an AC generator. One lead-end of each of star-connected phase-windings is gathered at a suitable position, and the other lead-end thereof is connected to an outside electric load. On the other hand, both lead-ends of each delta-connected phase-windings are connected to form a triangle having three joints, which are connected to an outside electric load.
The above-described connection between different phase-windings is located at coil-end groups formed at opposite ends of a stator core. The lead-end of each phase-winding extends along the ridge of the coil-end groups to the lead-ends of other phase-windings. These lead-ends are bound by threads to the coil-end groups to prevent the lead-ends from contacting with a rotor or a housing, as disclosed in JP-A-2-214445. It is also known that a portion of the lead-ends is inserted into stator's slots having additional conductor members to shorten the threads or reduce the number of threads to zero.
In the stator disclosed in JP-A-2-214445, the thread binding takes considerable work. Such thread binding work may hurt insulation coatings of the windings, resulting in an insulation problem.
It is also difficult to insert such lead-ends in some of the slots because of recent high power structure of the stator that has a high space factor of the winding.
SUMMARY OF THE INVENTION
Therefore, it is an object of the invention to provide an improved stator of a vehicle AC generator that has lead-ends easily and surely fixed to a coil-end group.
It is another object of the invention to provide a stator of a vehicle AC generator that has lead-ends well insulated from the coil-end group.
According to an aspect of the invention, a stator of a vehicle AC generator includes a stator core having a plurality of slots, a plurality of phase-windings formed of a plurality of conductor members. The stator winding has first and second coil-end groups formed of portions of the conductor members extending from the slots to opposite ends of the stator core. Each of the phase-windings has a lead-end which partially covered with an insulation member and extends along the first coil-end group to be connected to one another. The insulation member is bonded to the first coil-end group.
The insulation member has a thickness that provides distance to insulate the first coil-end group from the lead-ends.
In the stator, the insulation member can be an insulation tube through which the lead-end extends. The insulation tube can be formed of a textile that provides the insulation member with vibration resistance. The insulation member can be an insulation sheet disposed between the lead-end and the first coil-end group. The insulation member can be formed of an insulation adhesive resin.


REFERENCES:
patent: 3075112 (1963-01-01), Andersen et al.
patent: 4309634 (1982-01-01), Koroly et al.
patent: 5508571 (1996-04-01), Shafer
patent: 2-214445 (1990-08-01), None
patent: 2927288 (1999-05-01), None
patent: 1451806 (1989-01-01), None
patent: 92/06527 (1992-04-01), None
patent: 98/54823 (1998-12-01), None

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