Metal working – Means to assemble or disassemble – Means to assemble electrical device
Reexamination Certificate
2001-02-26
2003-11-04
Rosenbaum, I Cuda (Department: 3726)
Metal working
Means to assemble or disassemble
Means to assemble electrical device
C029S596000, C029S606000
Reexamination Certificate
active
06640421
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coil inserter for inserting a stator coil into a slot of a stator iron core in an electric motor.
2. Description of the Prior Art
With reference to a schematic diagram of
FIG. 4
, the description will be made of an example of a conventional coil inserter
100
.
On an inserter tool
101
, a plurality of blades
102
are vertically installed on one circumference at predetermined intervals so as to correspond to teeth between slots of a stator iron core
200
. At the upper ends of these blades
102
upwardly extending from the inserter tool
101
, there is inserted an alignment tool
103
for guiding the blades
102
onto an inner peripheral surface of the stator iron core
200
.
Also, in a space inside the plurality of blades
102
vertically installed on one circumference, there is arranged a stripper
104
, which is moved in an up-and-down direction relative to the blades
102
by driving a shaft
106
by a driving source
105
.
Further, on the outer periphery of the plurality of blades
102
vertically installed, a plurality of wedge guides
107
are vertically installed on a wedge guide holder
108
on the circumference at predetermined intervals. These wedge guides
107
hold, on the outer side thereof, wedges
110
configured by insulating paper or the like. The wedge guides
107
move in an up-and-down direction relative to the blades
102
by driving a wedge pusher
109
.
After a stator winding (coil
300
), to be mounted into the slots of the stator iron core, is inserted between the blades
102
, the alignment tool
103
is fittingly coupled with the blades
102
at their upper ends, and the alignment tool
103
is inserted into an inner surface of the stator iron core
200
(state of FIG.
4
).
Then, the stator iron core
200
is caused to move, while being guided by the alignment tool
103
, relative to the coil inserter
100
until upper ends of the wedge guides
107
come into contact with end portions of the slots of the stator iron core
200
.
Thereafter, the driving source
105
is driven to move the stripper
104
upward. Then, the coil
300
is pushed up by the stripper
104
to be inserted into the slots of the stator iron core
200
. Further, the driving source
105
drives to push up the wedge pusher
109
to thereby raise a wedge guide holder
108
and the wedge guides
107
. Then, the wedge
110
held by the wedge guides
107
is inserted into the slots. As a result, this wedge
110
covers a slot opening into which the coil
300
has been inserted.
The stripper
104
rises beyond a position of the upper end surface of the stator iron core
200
at the upper end surface position, whereby the coil
300
will be completely inserted into the slots of the stator iron core
200
. The wedge guide
107
rises until it reaches the upper end surface position of the stator iron core
200
, whereby the wedge
110
will cover the slot opening over its entire area.
Thereafter, the driving of the driving source
105
is stopped to remove the alignment tool
103
. The stator iron core
200
is caused to move upward to thereby extract the stator iron core
200
from this coil inserter
100
. At this time, the blade
102
and the wedge guide
107
retract from the stator iron core
200
, but the coil
300
and the wedge
110
are prevented from moving by friction or the like, and are held within the slots of the stator iron core
200
.
In the above described conventional coil inserter
100
, the coil
300
between the blades
102
is directly pushed up toward the stator iron core
200
by the movement of the stripper
104
to be inserted into the slots of the stator iron core
200
. At this time, the coil
300
may be crushed by a pushing-up force of the stripper
104
to be stuffed up between the blades
102
, that is, a locking phenomenon may occur. There may also arise the inconvenience that the coil
300
is damaged by the blade
102
when the coil
300
is transferred by the movement of the stripper
104
.
Therefore, in order to restrain this locking phenomenon or the like from occurring, it is necessary to pay attention to selection of the diameter of coil stock and setting of a coil filling factor into the slots.
In order to completely insert the coil
300
into the slots of the stator iron core
200
, the length of the blade
102
has to be equal to or more than the length of the stator iron core
200
in a vertical direction, as the coil
300
is pushed by the stripper
104
and guided by the blades
102
. The reason is as follows. That is, at a position where the upper end of the wedge guide
107
comes into contact with the end portions of the slots of the stator iron core
200
, the movement of the stator iron core
200
relative to the coil inserter
100
is caused to stop. Then, the stripper
104
is caused to move for starting to insert the coil
300
into the slots. If the blades
102
has not yet reached the upper end portion of the stator iron core
200
in that state, the coil
300
cannot be completely inserted into the slots even if the stripper
104
is caused to move up to such a position as to go beyond the upper end surface of the stator iron core
200
.
In this respect, Japanese Patent Application Laid-Open No. 54-126905 disclosed a coil inserter in which the length of the blades is made shorter.
Further, since the conventional coil inserter
100
requires a pushing-up mechanism such as the wedge pusher
109
, there is the problem that an apparatus as the coil inserter
100
becomes longer in a vertical direction and it is difficult to save the space.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to improve the above described conventional problems, and to provide a coil inserter capable of avoiding any locking phenomenon and further to provide a coil inserter capable of miniaturizing in a simple mechanism.
In a coil inserter according to the present invention, one end of the plurality of blades for guiding the coil into the slots of the stator iron core is coupled and fixed to a blade holder for supporting, and the stripper for supporting the coil is disposed on the inner periphery side of the blade. This stripper is fixed to a base for supporting the entire inserter. Thus, the stator iron core is urged in the axial direction of the electric motor using stator iron core inserting means, and the blades are inserted between the slots of the stator iron core, whereby the coil supported by the stripper is adapted to be inserted into the slots of the stator iron core.
Particularly, the blade holder is made freely advanceable and retractable. Also, there is provided a wedge guide for holding both ends of the wedge and supporting the rear surface of the wedge in the longitudinal direction, and both ends of the wedge guide are coupled and fixed to the stripper and the base respectively.
By using the above described coil inserter, the stator iron core is caused to advance or retract relative to the coil inserter, whereby the coil is inserted into the slots of the stator iron core. Also, the stator iron core is caused to advance or retract relative to the coil inserter, whereby insertion of the coil into the slots is started, and the blade holder is caused not to advance or retract until the coil reaches a predetermined position of the stator iron core, while after the coil reaches the predetermined position, the blade holder is also caused to advance or retract in response to the advancement or retraction of the stator iron core for inserting the coil. Thus, the locking phenomenon is prevented from occurring. Also, the stator iron core is caused to advance or retract relative to the coil inserter, whereby the wedge is inserted into the slots without being pushed up.
According to the present invention, a small-sized coil inserter can be obtained in a simple mechanism, without causing any locking phenomenon. Since the coil inserter is capable of preventing the locking phenomenon from occurring, it is capable of freely selecting a diame
Katsuzawa Yukio
Masuya Michi
Oka Hideki
Tagami Kiyoshi
Cuda Rosenbaum I
Fanuc Ltd.
Jimenez Marc
Staas & Halsley LLP
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