Method for producing a stator of an alternating-current...

Details Method for producing a stator of an alternating-current... Method for producing a stator of an alternating-current...

1996-03-26

2001-11-20

Hall, Carl E. (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S606000, C029S609000, C310S049540, C310S216006, C310S216055

Reexamination Certificate

active

06317962

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for producing a stator of an alternating current dynamo-electric machine, for example, an alternating current generator for automobiles, which is driven by an automobile engine, or the like.
2. Description of the Related Art
FIG. 4
is a cross-sectional view showing an example of an alternating current generator for automobiles to which the present invention can be applied. In this figure, a rotor
1
includes a rotating shaft
11
, a pair of claw pole field cores
12
mounted to the rotating shaft
11
, and a field coil
13
fixed within the pair of field cores
12
. The rotating shaft
11
is rotated by transmitting a driving force of an automobile engine through a belt (not shown).
A stator
2
surrounding the rotor
1
includes a stator core
21
and a stator coil assembly
22
fixed to the stator core
21
. The inner peripheral surface of the stator
2
is opposed to the outer peripheral surface of the rotor
1
through a gap. The stator
2
is held in place between a front bracket
3
and a rear bracket
4
. Furthermore, the rotor
1
is supported by the front bracket
3
and the rear bracket
4
through bearings
31
and
41
respectively.
A conventional method for producing the stator
2
will now be described in conjunction with FIG.
5
. First, a strip
20
having a plurality of slots is cut from a long, narrow steel plate as shown in FIG.
5
. At this time, two strips
20
can be cut from one steel plate. Next, one strip
20
is wound into a ring to produce the stator core
21
having a prescribed semi-diameter as shown in
FIG. 6. A
plurality of slots
21
a
are provided on the inner peripheral surface of the stator core
21
.
On the other hand, the stator coil assembly
22
is formed into a cylindrical shape as shown in FIG.
7
. The cylindrical stator coil assembly
22
is brought into the inside of the cylindrical stator core
21
along a guide (not shown) by an assembling apparatus (not shown) while bending its end portion, and thereafter inserted into the slots
21
a
of the stator core
21
to obtain the stator
2
as shown in FIG.
8
.
Further, methods disclosed, for example, in U.S. Pat. No. 416,033 and Japanese Patent Laid-Open No. 52-34301 are known as methods for producing the cylindrical stator core
21
.
In the conventional method for producing the stator
2
as described above, the stator coil assembly
22
is inserted into the slots
21
a
after being pre-formed into the cylindrical shape so as to correspond to slots
21
a
disposed cylindrically. This assembly operation is complicated and the stator coil assembly
22
is sometimes damaged. Therefore, a production efficiency is reduced. Further, the stator coil assembly
22
cannot be inserted into the slots
21
a
at a higher density, so output cannot be improved.
SUMMARY OF THE INVENTION
The present invention has been achieved with a view toward solving the problems described above, and further, it is an object of the present invention to provide a method for producing a stator of an alternating current dynamo-electric machine which is capable of easily disposing a stator coil assembly in slots of a stator core at a higher density and which also is preventing damage to conductors of the stator coil assembly.
To this end, according to an aspect of the present invention, there is provided a method for producing a stator of an alternating current dynamo-electric machine, comprising the steps of: laminating a plurality of magnetic strips together to produce a laminated core assembly with a rectangular parallelopiped shape having a plurality of slots; disposing a stator coil assembly in the slot; and bending the laminated core assembly together with the stator coil assembly to produce a cylindrical stator.


REFERENCES:
patent: 3802066 (1974-04-01), Barrett
patent: 4102040 (1978-07-01), Rich
patent: 4116033 (1978-09-01), Iwaki et al.
patent: 4365180 (1982-12-01), Licata et al.
patent: 5592731 (1997-01-01), Huang et al.
patent: 5234301 (1977-03-01), None

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