Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-01-25
2002-11-05
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S216006, C310S216055
Reexamination Certificate
active
06476533
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stator for a starter motor used in vehicles and the like, and more particularly, to a stator for a starter motor having a bendable stacked core.
2. Description of the Related Art
FIG. 14
is a perspective view showing the structure of a stator for a conventional starter motor;
FIG. 15
is a plan view of the stator; and
FIG. 16
is a perspective view showing an assembly process of the stator.
In the figures, four poles
104
are disposed in a cylindrical yoke
103
. Field coils
107
are mounted on the four poles
104
.
In the conventional stator arranged as described above, the yoke
103
is arranged as the cylindrical yoke (“bent yoke portion”) by rounding a sheet member and welding the joints thereof. Spigot portions
106
, which are formed at the ends of the yoke
103
in the axial direction thereof, are processed by machining, and fitted to not shown brackets.
Further, the poles
104
are made in a different process by, for example, forging or the like and mounted on the yoke
103
later. Furthermore, the field coils
107
are previously wounded in a different process and the spaces between wires are previously subjected to insulation processing by powder coating or the like.
The conventional stator arranged as described above is assembled in such a manner that, first, the electric field coils
107
, which have been wounded and subjected to the insulation processing, are mounted on the poles
104
. Then, the poles
104
are mounted on the yoke
103
through the mounting holes
103
a
thereof by caulking, screws or the like.
In the stator for the starter motor arranged as described above, the yoke
103
must have a predetermined thickness because a yoke made of a thin sheet member cannot achieve its function. Thus, the yoke
103
is made in such a manner that a thick sheet member is cut off by a large press and gradually rounded so as to be formed in a cylindrical shape, then the cylindrical thick sheet member is subjected to a drawing process to provide it with accuracy by making the deformed portions of the cylindrical member to a perfect cylindrical shape. Thereafter, the spigot portions
106
are machined at the ends of the cylindrical member in the axial direction thereof and the mounting holes
103
a
are drilled to the cylindrical member.
The conventional so-called “bent yoke portion” made by the above method requires many dedicated apparatuses such as a large press, welder, outside diameter drawing machine, lathe, drilling machine, coating machine, and the like. Further, many processes are necessary to manufacture the “bent yoke” and the respective processing apparatuses are large in size, from which a problem arises in the manufacture of the “bent yoke”.
SUMMARY OF THE INVENTION
An object of the present invention, which was made to solve the above problems, is to provide a stator for a starter motor whose manufacturing cost can be reduced.
In the stator, which is composed of a stacked core, for the starter motor according to the present invention, the stacked core being arranged such that a plurality of sheet members each having a yoke portion and a pole portion are disposed like a band, adjacent sheet members are stacked and coupled with each other so that the ends of the yoke portions thereof are overlapped, the plurality of sheet members are made to an annular shape by being bent at the coupled portions thereof to cause the pole portions to face the center of the annular shape, and the plurality of sheet members are formed in at least an approximately linear shape when developed, resin winding cores are interposed between the pole potions and wires wound around the pole portions.
REFERENCES:
patent: 1756672 (1930-04-01), Barr
patent: 1808572 (1931-06-01), Reist
patent: 2795713 (1957-06-01), Woll
patent: 5729072 (1998-03-01), Hirano et al.
patent: 5786651 (1998-07-01), Suzuki
patent: 6127753 (2000-10-01), Yamazaki et al.
patent: 6300700 (2001-10-01), Nishiyama et al.
patent: 2000-116075 (2000-04-01), None
patent: 2000-116974 (2000-04-01), None
Akutsu Satoru
Nakahara Yuji
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