JP2003061322A - Wedge cutter of stator winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wedge cutter of stator winding in which a wedge can be cut with high work efficiency while lessening burden on a worker. SOLUTION: An upper frame 10 and a lower frame 18 are disposed in parallel with each other while facing each other and linked through a pair of telescopic adjustable columns 20. The upper frame 10 is provided, in the vicinity of the opposite end parts thereof, with guide plates 14 each having a saw cutter insertion hole 14a. The upper frame 10 is also provided with a plurality of upper rollers 15 such that the outer circumference is projected from the upper surface thereof and the lower frame 18 is provided with a plurality of lower rollers 19 such that the outer circumference is projected from the bottom face thereof. A pair of motor circular saw means 30 each having a circular saw cutter 31 are disposed such that the saw cutter 31 is inserted into the saw cutter insertion hole 14a and linked, respectively, with a pair of circular saw elevating means 40 having one end fixed rotatably to the upper frame 10. The upper frame 10 is further provided with a stay securing means 43 for securing the circular saw elevating means 40 at a specified position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wedge cutting device for cutting a wedge to which a stator winding is fixed, and more particularly, to a wedge winding of a stator winding, which is light on the operator's workload and allows efficient wedge cutting. Regarding the device.

[0002]

2. Description of the Related Art When the stator winding of a rotating electric machine is rewound, first, a work for removing the wedge fixing the stator winding in the slot of the stator core is performed. Conventionally, to remove this wedge, apply a pad to the wedge,
While striking this pad with a hammer, the wedges were pulled out axially one by one from the slot.

[0003]

However, since the wedge of the stator winding is fixed in the slot by a varnish such as epoxy, it is not easy to extract it and a large impact force is required. For this reason, the physical fatigue of the worker is severe, and particularly when the wedge in the slot arranged above the horizontally placed stator iron core is pulled out, the hammering work is performed upward, so the worker As a result, he was forced to perform severe muscular work in an unnatural posture, and in combination with the poor working environment, his work efficiency declined significantly. In view of such circumstances, there has been a demand for a wedge cutting device which can lightly cut the wedge prior to the work of removing the wedge and which can efficiently perform the cutting of the wedge.

The present invention has been made in order to solve the above problems, and provides a wedge-winding device for a stator winding, which is light on the operator's weight and can efficiently perform wedge cutting. The purpose is to do.

[0005]

SUMMARY OF THE INVENTION A stator winding wedge cutting device according to the present invention moves a wedge for fixing a stator winding disposed in a slot of a stator core along the slot. While cutting the device, the upper frame and the lower frame, which are arranged substantially parallel to each other and are opposed to each other, and a plurality of adjustable struts in which the upper frame and the lower frame are extendably connected.
A guide plate provided along the longitudinal direction of the upper frame in the vicinity of both ends of the upper frame and having a long and narrow saw blade insertion hole penetrating in the same direction, and an outer periphery of the guide plate protruding from the upper surface of the upper frame. An upper roller rotatably arranged on the upper frame, a lower roller rotatably arranged on the lower frame so that the outer periphery thereof projects from the bottom surface of the lower frame, and a circular saw blade. An electric circular saw means arranged so that a saw blade is inserted into a saw blade insertion hole of the guide plate, and the electric circular saw means are connected to the upper frame and rotatably attached to the electric circular saw. A circular saw elevating means for elevating and lowering the means so that the circular saw blade protrudes from the upper surface of the guide plate by a predetermined height, and the circular saw elevating means at a position where the circular saw blade protrudes by a predetermined height from the upper surface of the guide plate. Fixed hand to fix It is those with a door.

In the stator winding wedge cutting device according to the present invention, the adjustable support column has an upper support column having one end coupled to the upper frame and one end coupled to the lower frame. And a strut length adjusting means for connecting the other ends of the upper strut and the lower strut so as to extend and contract.

Further, in the stator winding wedge cutting device according to the present invention, the upper roller and the lower roller respectively have a pair of coaxial wheels projecting from the upper surface of the upper frame and the lower surface of the lower frame, respectively. A guide wheel that is larger than the wheels and that is disposed between the wheels; and when the protruding portion of the guide wheel of the upper roller is disposed in a predetermined slot in which the wedge is disposed, the upper portion The outer circumference of the wheel of the roller is close to the inner circumference of the stator core on both sides of the predetermined slot, and the protruding portion of the guide wheel of the lower roller is substantially symmetrical to the predetermined slot with respect to the central axis of the stator core. The outer circumference of the wheel of the lower roller is placed on the inner circumference of the stator core on both sides of the other slot. The one in which the features.

Further, in the wedge cutting device for the stator winding according to the present invention, the width of each guide wheel of the upper roller and the lower roller is formed to be slightly smaller than the width dimension of the slot. It is what

Further, in the stator coil wedge cutting device according to the present invention, when the guide plate causes the outer circumference of the wheel of the upper roller to approach the inner circumference of the stator core on both sides of the predetermined slot. Further, it is arranged so as to be spaced apart from the wedge in the predetermined slot at a position apart from the upper roller.

Further, the wedge cutting device for the stator winding according to the present invention is characterized in that the width of the guide plate is formed to be slightly smaller than the width dimension of the slot.

Further, in the stator winding wedge cutting device according to the present invention, a predetermined height at which the circular saw blade of the electric circular saw means protrudes from the upper surface of the guide plate has a predetermined height from the upper surface of the guide plate. It is characterized in that the saw blade has a distance to a height sufficient to penetrate the wedge.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view showing a wedge cutting device according to a first embodiment of the present invention, FIG. 2 is a plan view mainly showing a left side portion of the wedge cutting device in FIG. 1, and FIG. 3 is a wedge cutting device in FIG. It is the side view which looked at the apparatus from the left.

The wedge cutting device according to the first embodiment shown in FIGS. 1 to 3 is roughly divided into an upper frame 10 and
It comprises a lower frame 18, an adjustable support column 20, an electric circular saw means 30, a circular saw lifting means 40, and a stay fixing means 43. To explain the general outline, the upper frame 10 and the lower frame 18 are arranged substantially parallel to each other and are opposed to each other, and the upper frame 10 and the lower frame 18 are connected by a pair of adjustable columns 20. There is. Circular saw elevating means 40 are provided at both ends of the upper frame 10, respectively.
Is rotatably mounted, and each circular saw elevating means 40 is connected to an electric circular saw means 30. Then, when the circular saw elevating means 40 is rotated to raise the electric circular saw means 30 to a predetermined height, the stay fixing means 43 provided at the lower portion of the upper frame 10 fixes the circular saw elevating means 40 at a predetermined position. It has become so.

More specifically, the upper frame 10 includes a substrate 11
The grooved member 11 is composed of a and both side plates 11b and is arranged in a downwardly open U-shape, and the mounting plates 12 joined to the lower surfaces of both ends of the substrate 11a. A pair of guide plates 14 are provided near the both ends of the upper frame 10 along the longitudinal direction of the upper frame 10. A slender saw blade insertion hole 14a is provided through the center of the guide plate 14 along the longitudinal direction of the upper frame 10, and a through hole 11c is also provided in the substrate 11a corresponding to the saw blade insertion hole 14a. There is.
In addition, the width W of the guide plate 14 is set to the slot 2 of the stator core 1.
The width of the guide plate 14 is slightly smaller than the width dimension (see FIG. 4), for example, about 2 mm smaller than the width dimension of the slot 2. It serves as a guide (see FIG. 6) when moving along the slot 2. Therefore, the circular saw blade 3
1 can also reliably cut the wedge along the slot 2, and it is prevented that the circular saw blade 31 is damaged during the cutting operation due to the lateral vibration.

On both side plates 11b of the upper frame 10, a plurality of upper rollers 15 are provided with a pair of coaxial wheels 15b and a guide wheel 15a which is larger than the wheels 15b arranged between the pair of wheels 15b (details). 7 are each rotatably disposed with each outer periphery thereof projecting from the upper surface of the upper frame 10 by a predetermined height. The guide plate 14
Is arranged such that the protruding portion of the guide wheel 15a of the upper roller 15 is arranged in the predetermined slot 2 in which the wedge 4 is arranged, and the outer circumference of the wheel 15b is the inner circumference of the stator core 1 on both sides of the predetermined slot 2. When approached to (see Fig. 7),
At a position apart from the guide wheel 15a in the predetermined slot 2 (see FIGS. 1 and 2), the wedge 4 and the wedge 4 are arranged at a distance H (see FIG. 6). Therefore, during the cutting work of the wedge 4, the wedge cutting device can smoothly move along the slot 2, and it is prevented that the circular saw blade 31 is damaged due to vibration during the cutting work. It

The lower frame 18 is composed of a grooved member composed of a substrate 18a and both side plates 18b and arranged in an upwardly open U-shape. On both side plates 18b, a plurality of lower rollers 19 are provided with a pair of coaxial wheels 19b and a guide wheel 19a which is larger than the wheels 19b arranged between the pair of wheels 19b (see FIG. 7). The outer periphery of each of the guide wheels 15a and the wheels 15b in FIG. 7) is rotatably disposed so as to protrude from the bottom surface of the lower frame 18 by a predetermined height. Both the width of the guide wheel 15a of the upper roller 15 and the width of the guide wheel 19a of the lower roller 19 are both slightly smaller than the width dimension of the slot 2 of the stator core 1, for example, 2 mm smaller than the width dimension of the slot 2. It is formed to a value. As a result, during the cutting work of the wedge 4, the wedge cutting device can move smoothly along the slot 2, and the rigidity of the wedge cutting device is increased to suppress the vibration during the cutting work. The circular saw blade 31 is prevented from being damaged.

The adjustable strut 20 includes an upper strut 21, a lower strut 22, and a strut length adjusting means 23. One end of the upper support column 21 has a base plate 11 of the upper frame 10.
It is fixed to the lower surface of a and has a male screw portion 21a at the other end. One end of the lower support column 22 is fixed to the upper surface of the substrate 18a of the lower frame 18, and the male screw part 22a is formed at the other end. Support length adjusting means 23
Includes a column adjustment body 24 and male screw portions 21a and 22a. Inside the strut adjusting body 24, a female screw portion 23a into which the male screw portion 21a is screwed is formed on one side, and a female screw portion 23b into which the male screw portion 22a is screwed is formed on the other side.

Therefore, when the strut adjusting body 24 is rotated in one direction by the handle 24a (see FIG. 3), for example, the upper strut 21 and the lower strut 22 both move in the extending direction,
When the strut adjusting body 24 is turned in the opposite direction, the upper strut 21 and the lower strut 22 both move in the contracting direction,
The length between the upper strut 21 and the lower strut 22 can be adjusted. As a result, the height between the upper frame 10 and the lower frame 18 can be adjusted, and the wheels 15 of the upper roller 15 can be adjusted.
The dimension between the outer circumference of b and the outer circumference of the wheel 19b of the lower roller 19 can be set to a value slightly smaller than the inner diameter of the stator core 1 (see FIG. 4).

The circular saw lifting / lowering means 40, to which the electric circular saw means 30 is connected, is rotatably attached to both ends of the upper frame 10, and the right one in FIG. 1 is the circular saw lifting / lowering means. (A) 40, and the one on the left side thereof is circular saw elevating means (B) 40. The electric circular saw means 30 includes a circular saw blade 31 and a reduction motor 32. The circular saw elevating means 40 includes a stay 41 and a lever 42, and a tip portion of the stay 41 is rotatably attached to a tip portion of a mounting plate 12 of the upper frame 10 with a bolt 13.
Then, by raising and lowering the lever 42 of the circular saw elevating means 40 and rotating the stay 41 with the bolt 13 as a fulcrum, the electric circular saw means 30 is elevated and lowered, and the circular saw blade 31 is wedged from the upper surface of the guide plate 14. The wedge 4 is projected to a predetermined height sufficient for penetrating 4 and the wedge 4 is cut (see FIG. 6). The stay fixing means 43 is the upper frame 10
The side plate 11b is provided with a rod 45 provided at the lower end and a pair of fixing nuts 44. The stay 41 is fixed to the rod 45 by being tightened from above and below by a fixing nut 44 at a position where the circular saw blade 31 is projected from the upper surface of the guide plate 14 to the predetermined height.

Next, a method of cutting a wedge using the wedge cutting device configured as described above will be described with reference to the drawings. FIG. 4 is a perspective view showing a state in which the wedge cutting device of the present invention is set in the stator core and the cutting of the wedge is started, and FIG. 5 shows a situation of cutting the wedge using the wedge cutting device of the present invention. Explanatory drawing, FIG.
FIG. 7 is a sectional view showing a state in the slot during cutting of the wedge, and FIG. 7 is a sectional view showing a state in which the upper roller is inserted into the slot during cutting of the wedge.

Before setting the wedge cutting device in the stator iron core 1, first, the length of the adjustable prop 20 is adjusted by the prop adjuster 24 shown in FIG. 1, and the outer circumference of the wheel 15b of the upper roller 15 is adjusted. The dimension between the outer circumference of the wheel 19b of the lower roller 19 (see FIGS. 1 and 7) is set to be slightly smaller than the inner diameter of the stator core 1. After that, the wedge cutting device is carried into the stator core 1 and, as shown in FIG.
The upper frame 10 is disposed so as to face a predetermined slot 2 in which is arranged, and the guide plate 14 (see FIG. 6) of the upper frame 10 and the guide wheel 1 of the upper roller 15 are arranged in the slot 2.
5a (see FIG. 7) is arranged. In this case, the guide plate 14 and the guide wheel 15a are arranged at positions separated from each other in the predetermined slot 2. Then, the lower frame 18 is arranged so as to face another slot 2 (not shown) located at a position symmetrical to the predetermined slot 2 with respect to the central axis of the stator core, and the guide wheel 19a thereof is provided with the guide wheel 19a. (See FIG. 7, corresponding to the guide wheel 15a in FIG. 7). If the total number of slots is odd,
As the other slot 2, a slot 2 located at a position substantially symmetrical to the predetermined slot 2 with respect to the central axis of the stator core may be selected.

In this state, the outer circumference of the wheel 15b is close to the inner diameter portions of the stator core 1 on both sides of the predetermined slot 2 in which the guide wheel 15a is arranged, and the guide wheel 19a is arranged on the outer circumference of the wheel 19b. The wedge cutting device is placed in the inner diameter portion of the stator core 1 on both sides of the other slot 2 and the wedge cutting device is set in the stator core 1. Since the wedge cutting device is set in the stator core 1 as described above, the rigidity of the wedge cutting device is increased and the vibration during the cutting work is suppressed.
Damage of 1 is prevented. Therefore, when the wedge cutting device is not stable in the set state, the column adjuster 24
Thereby, the length of the adjustable support column 20 is readjusted.

Next, the switch of the reduction motor 32 is turned on, and the lever 42 (see FIG. 1) of the circular saw elevating means (A) 40 (hereinafter referred to as the circular saw elevating means A) is pulled up to raise the circular saw blade 3.
While cutting the wedge 4 with 1, the outer peripheral upper end of the circular saw blade 31 is protruded from the upper surface of the guide plate 14 to a predetermined height, for example, a position 1 mm beyond the back surface of the wedge 4 (see FIG. 6) and the spacer insulation 5 is attached. Let's cut in. In this way, the circular saw blade 31 regulates the predetermined height protruding from the upper surface of the guide plate 14, whereby the stator winding 3 can be prevented from being damaged. Therefore, the above regulation is necessary when the stator winding 3 is repaired and used. At this stage,
The circular saw blade 31 (not shown) on the side of the circular saw elevating means (B) 40 (hereinafter, referred to as the circular saw elevating means B) remains retracted. 4 and 5 show this state.

In the set state, as shown in FIG.
At the position of the end of the area C (the starting point of the area D where the cutting is started), which is separated from the end of the wedge 4 to be cut by the distance between the centers of both circular saw blades 31, the circle on the side of the circular saw elevating means A is placed. The center of the saw blade 31 is set to come. Then, the wedge 4 in the area D is cut while manually pushing the wedge cutting device in the direction of the arrow E.

After the cutting of the wedge 4 in the area D is completed, the guide wheel 15a of the upper roller 15 is arranged in the predetermined slot 2 and the guide wheel 19a of the lower roller 19 is arranged in the other slot 2. The lever 42 (see FIG. 1) of the circular saw elevating means A is pulled down, and the lever 42 of the circular saw elevating means B is pulled up to project the circular saw blade 31 on that side from the upper surface of the guide plate 14 by a predetermined height. Let (not shown),
The wedge 4 in the remaining C area is cut. When the cutting of the wedge 4 in the area C is completed, the lever 42 of the circular saw elevating means B is pulled down to retract the circular saw blade 31 on that side. And
Move to the next slot 2 and repeat the same process as above,
The cutting of the wedges 4 of all the slots is completed in the same manner. As described above, according to the first embodiment, the burden on the operator in cutting the wedge is light and the work efficiency can be improved. Also, during the wedge cutting work, a vacuum cleaner is attached to the dust suction port (not shown) of the wedge cutting device to suck and discharge the cutting powder of the wedge, so that the working environment is kept good. .

In the first embodiment, the mode in which the wedge is cut while switching between the circular saw elevating means A and the circular saw elevating means B has been described, but the circular saw elevating means A and the circular saw elevating means B are shown.
It is also possible to pull up both together and cut the wedge at once with both circular saw blades. In this case, the time required for cutting the wedge is shortened. However, since the stress applied to the wedge cutting device increases, it is necessary to increase the rigidity of the main body. Note that the wedges that have been cut using this wedge cutting device and that remain in the slot can be easily removed by hitting them with a shockless hammer, etc. The person is not forced to do heavy physical labor.

[0027]

The wedge cutting device according to the present invention has an upper frame and a lower frame which are arranged substantially parallel to each other and are opposed to each other, and a plurality of flexible frames which are elastically connected between the upper frame and the lower frame. An adjustment column,
A guide plate provided along the longitudinal direction of the upper frame in the vicinity of both ends of the upper frame and having a long and narrow saw blade insertion hole penetrating in the same direction, and an outer periphery of the guide plate protruding from the upper surface of the upper frame. An upper roller rotatably arranged on the upper frame, a lower roller rotatably arranged on the lower frame so that the outer periphery thereof projects from the bottom surface of the lower frame, and a circular saw blade. An electric circular saw means arranged so that a saw blade is inserted into a saw blade insertion hole of the guide plate, and the electric circular saw means are connected to the upper frame and rotatably attached to the electric circular saw. A circular saw elevating means for elevating and lowering the means so that the circular saw blade protrudes from the upper surface of the guide plate by a predetermined height, and the circular saw elevating means at a position where the circular saw blade protrudes by a predetermined height from the upper surface of the guide plate. Fixed hand to fix Since it is configured with a door, lighter burden on the operator, it is possible to perform the cutting of the work efficiently wedge.

Further, the adjustable strut includes an upper strut having one end coupled to the upper frame, a lower strut having one end coupled to the lower frame, and an upper strut and a lower strut. Even if it is configured to include a strut length adjusting means for connecting the other end portions so as to be able to expand and contract, or the upper roller and the lower roller are the upper surface of the upper frame and the lower surface of the lower frame, respectively. A pair of coaxial wheels protruding from the wheel, and a guide wheel larger than the wheel disposed between the pair of wheels. The protruding portion of the guide wheel of the upper roller has the wedge. When placed in a predetermined slot, the outer circumference of the wheel of the upper roller is close to the inner circumference of the stator core on both sides of the predetermined slot, and the protruding portion of the guide wheel of the lower roller. It is arranged in another slot that is substantially symmetrical to the predetermined slot with respect to the central axis of the stator core, and the outer circumference of the wheel of the lower roller is mounted on the inner circumference of the stator core on both sides of the other slot. Or the width of each of the guide wheels of the upper roller and the lower roller is formed to be slightly smaller than the width dimension of the slot, Since the wedge cutting device can be easily mounted in the stator core with high rigidity, vibration during cutting work can be suppressed to a low level and damage to the circular saw blade can be prevented.

Further, the guide plate is arranged so that when the outer circumference of the wheel of the upper roller comes close to the inner circumferences of the stator cores on both sides of the predetermined slot, the predetermined distance at the predetermined distance from the upper roller. Even if it is arranged to be spaced from the wedge in the slot,
Alternatively, even if the width of the guide plate is formed to be slightly smaller than the width of the slot, the wedge cutting device can be smoothly moved along the slot. It is possible to prevent damage due to horizontal shake or vibration.

Further, the predetermined height at which the circular saw blade of the electric circular saw means is projected from the upper surface of the guide plate is such that the circular saw blade is sufficiently high from the upper surface of the guide plate to penetrate the wedge. Therefore, the circular saw blade that cuts the wedge does not damage the stator winding, and there is no trouble in repairing and using the stator winding.

[Brief description of drawings]

FIG. 1 is a front view showing a wedge cutting device according to a first embodiment of the present invention.

FIG. 2 is a plan view mainly showing a left side portion of the wedge cutting device in FIG.

FIG. 3 is a side view of the wedge cutting device in FIG. 1 as viewed from the left side.

FIG. 4 is a perspective view showing a state where the wedge cutting device of the present invention is set in the stator core and the cutting of the wedge is started.

FIG. 5 is an explanatory view showing a situation in which a wedge is cut using the wedge cutting device of the present invention.

FIG. 6 is a cross-sectional view showing a state in the slot during cutting of the wedge.

FIG. 7 is a cross-sectional view showing a state in which the upper roller is inserted into the slot during the cutting of the wedge.

[Explanation of symbols]

1; Stator core 2; Slot 3; Stator winding 4;
Wedge 10; upper frame 14; guide plate 14a; saw blade insertion hole 15; upper rollers 15a, 19a; guide wheels 15b, 19b; wheel 1
8; Lower frame 19; Lower roller 20 Section support 21; Upper support 2
2; Lower strut 23; Strut length adjusting means 30; Electric circular saw means 31; Circular saw blade 40; Circular saw elevating means 43; Stay fixing means

Claims (7)

[Claims] 1. A device for cutting a wedge for fixing a stator winding arranged in a slot of a stator iron core while moving along the slot, the device being opposed to each other at substantially parallel intervals. And an upper frame and a lower frame that are arranged in parallel, a plurality of adjustable columns that extendably connect the upper frame and the lower frame, and on the vicinity of both ends of the upper frame along the longitudinal direction of the upper frame. A guide plate provided with an elongated saw blade insertion hole penetrating in the same direction, an upper roller rotatably disposed on the upper frame so that the outer periphery thereof projects from the upper surface of the upper frame, and an outer periphery of the lower portion. A lower roller rotatably arranged on the lower frame so as to project from the bottom surface of the frame and a circular saw blade, and the circular saw blade is inserted into the saw blade insertion hole of the guide plate. And the electric circular saw means connected to the upper frame so as to be rotatable, and the electric circular saw means is moved up and down to move the circular saw blade to the guide plate. And a fixing means for fixing the circular saw elevating means at a position where the circular saw blade protrudes a predetermined height from the upper surface of the guide plate. Wedge cutting device for stator winding. 2. The adjustable strut comprises: an upper strut having one end coupled to the upper frame, a lower strut having one end coupled to the lower frame, and an upper strut and a lower strut. 2. The wedge cutting device for the stator winding according to claim 1, further comprising a column length adjusting means for connecting the other end portions so as to extend and contract. 3. The upper roller and the lower roller each have a pair of coaxial wheels protruding from an upper surface of the upper frame and a lower surface of the lower frame, respectively, and a guide larger than the wheels arranged between the pair of wheels. When the protruding portion of the guide wheel of the upper roller is arranged in a predetermined slot in which the wedge is arranged, the outer circumference of the wheel of the upper roller is on both sides of the predetermined slot. The protruding portion of the guide ring of the lower roller is arranged in another slot that is close to the inner circumference of the stator core and is substantially symmetrical to the predetermined slot with respect to the central axis of the stator core. The outer circumference of the wheel of the lower roller is mounted on the inner circumference of the stator core on both sides of the other slot.
Wedge cutting device for the stator winding described. 4. The wedge of the stator winding according to claim 3, wherein the width of each of the guide wheels of the upper roller and the lower roller is formed to be slightly smaller than the width of the slot. Cutting device. 5. The guide plate is configured such that when the outer circumference of the wheel of the upper roller is brought close to the inner circumferences of the stator cores on both sides of the predetermined slot, the guide plate is provided with the predetermined distance from the upper roller. The wedge cutting device for the stator winding according to claim 3 or 4, wherein the wedge cutting device is arranged in the slot with a space from the wedge. 6. The wedge cutting device for the stator winding according to claim 5, wherein the width of the guide plate is formed to be slightly smaller than the width dimension of the slot. 7. The predetermined height at which the circular saw blade of the electric circular saw means protrudes from the upper surface of the guide plate is a sufficient height for the circular saw blade to penetrate the wedge from the upper surface of the guide plate. 7. The wedge cutting device for the stator winding according to any one of claims 1 to 6, characterized in that