JPH04105537A - Inserting device for coil - Google Patents

Abstract

PURPOSE:To insert a wedge and a stator coil without large frictional resistance by radially disposing protrusions in a stripper, and slidably providing it from a blade to a stator core. CONSTITUTION:Since a stator coil 11 tends to tilt inward toward the center of a stator core 9, when a protrusion 33 rises, the coil 11 is pressed toward the outer periphery of a slot. Thus, a gap 70 of a region of the thickness of the protrusion in width X of the protrusion is formed directly under the lower end 33a of the protrusion 33. Since the upper end 12a of the wedge 12 is inserted to the gap 70 during rising, it is not brought into direct contact with the coil 11. Further, the coil 11 is pressed by the outer end 33b of the protrusion 33 to contain the wedge 12 in the side 33c formed at the inner periphery from the outer end 33b while rising. Accordingly, since the wedge 12 is suppressed in contact resistance with the coil 11 during rising by the wedge 40, damage of the wedge when the coil is inserted in high occupying area can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coil insertion device for inserting a stator coil of a rotating electric frame into a slot of a stator core, and more specifically, a device for fixing a stator coil in a stator core. This invention relates to an improvement of a pier for inserting a wedge into a slot together with a stator coil.

[Conventional technology]

FIG. 9 is a schematic side sectional view of a conventional coil insertion device.

Note that similar components are represented by the same reference numerals or symbols throughout the drawings. This figure shows a stator core 9 made of a laminated iron core, a large number of slots 10 provided in the stator core 9, a stator coil 11 inserted into the slots to form a rotating magnetic field, and a stator coil 11 inserted into the slots 10. a blade 21 into which the stator core 9 is fitted; a stripper 25 which pushes the stator coil 11 into the slot 10; a cutout corner 27 of the stripper 25 which hooks and pushes up the stator coil 11; 5, a protrusion 32 into which the coil is pushed, a cam 35 which applies a pushing force to the protrusion 32, a spring 39 which provides a return force to the protrusion 32, and a wedge pusher 40 which pushes up the wedge 12. and a piston rod 49 that provides a force for the cam 35 to rise. Note that a detailed explanation of the coil insertion device will be given in the Examples section.

Next, the operation will be explained. In Fig. 9, first the stripper 2
Raise 5. FIG. 10 is a partial side sectional view of a conventional coil insertion device in the middle of coil insertion.

As shown in this figure, the stator coil 11 is connected to the stripper 2
The blade 21 is hooked on the cutout corner 27 of the
and inserted into the slot 10. The wedge 12 is also pushed up by the wedge pusher 40 and inserted into the slot 12.

FIG. 11 is a diagram showing how the notched corner portion reaches near the upper end surface of the stator core. As shown in this figure, when the insertion of the stator coil 11 into the slot 10 is almost completed, the lifting of the stripper 25 is temporarily stopped. FIG. 12 is a partial sectional view of a conventional projection when the stripper is stopped. At this time, the wedge 12 is still in slot 1, as shown in FIG.
The insertion into the slot 10 is not completed yet, and as shown in FIG. By the way, until this point, the stator coil 11 and the wedge 12
Since the insertion of the two into the slot 10 proceeds simultaneously in parallel, almost no frictional resistance is generated between the two, and the two are smoothly inserted.

After stopping the stripper 25, the piston rod 49 is raised to displace the cam 35 upward to a position regulated by the stopper. As the cam 35 is displaced, the protrusions 32 that are in sliding contact with the cam surface are pushed apart against the biasing force of the spring 39 and protrude from the outer peripheral surface of the stopper 25. 1st
FIG. 3 is a partial cross-sectional view of a conventional projecting protrusion. As shown in this figure, the protrusion 32 is connected to the slot 10 as shown in FIG.
and press the wedge 12 deep into the slot 10. As a result, the stator coil 12 is plastically deformed and pushed to the back of the slot. Next, piston rod 4
9 is lowered and the cam 35 is returned to its original position, the protrusion 3
2 is also returned to its original position by the spring 39.

Then, the stripper 25 is raised again. Then, the upper end of the stator coil 11, which has fallen inward, is raised outward at the notched corner portion 27. At the same time, the wedge 12 is pushed up by the wedge pusher 40, and the insertion into the slot 10 is completed. During this time, as described above, the stator coil 11 is plastically deformed and is biased toward the back of the slot, so the frictional resistance between the stator coil 11 and the wedge 12 is very small, and the wedge 12 is smoothly inserted into the slot 10. After the insertion of the wedge 12 is completed, the stripper 25 descends and returns to the position shown in FIG. 9, completing one process.

[Problem to be solved by the invention]

As described above, in the conventional coil insertion device, the coil is temporarily stopped during the coil insertion, and the protrusion 3 is inserted as shown in FIGS.
The reason why it was possible to push the wedge 12 and the coil toward the outer diameter side of the slot 10 by applying a pressing force to the slot 10 was because the range in which the protrusion 32 could move was large, as shown in FIG. This is because the stator coil 11 could be moved by the pressing force of the protrusion 32 since there was still room for a plurality of coils in the slot 10 area. However, if there is no room for the stator coil 11 to fit into the slot 10 of the stator core 9 and the space factor becomes higher than that of the conventional technology, the movement of the protrusion 32 becomes extremely small. FIG. 14 is a diagram showing the conventional protrusion movement amount when the space factor of the stator coil 11 increases. As shown in Figure 14, the projection 32
If the amount of movement of the wedge 12 decreases, the frictional resistance of the wedge 12 becomes large and the wedge 12 becomes unable to be inserted by the time shown in FIG. Furthermore, the wedge 12 is damaged due to buckling, bending, or bending, and the wedge 12 protrudes outside the slot 10, resulting in a decrease in product quality.
This resulted in a huge loss.

Therefore, in view of the above problems, it is an object of the present invention to provide a coil insertion device that makes it possible to insert a wedge and a stator coil without the wedge being subjected to large frictional resistance due to the high space factor of the stator coil.

[Means to solve the problem]

The present invention has protrusions in the coil device in order to solve the above problems. The protrusions are arranged radially inside the stripper and can slide between the inside of the blade and the slot of the stator core, and have a cross-sectional shape similar to that of a wedge, but with a slightly larger cross-sectional area to press the stator coil. The outer end surface is located directly above the wage when the stator coil is inserted.

The blade is also provided with a blade relief that allows the protrusion to move in and out of the blade, and before inserting the stator coil, the outer end surface of the protrusion is placed at the position of the artificial wall of the slot via the blade relief.

Further, the protrusion is arranged inside the stripper so as to exceed the upper end of the blade after the coil insertion is completed, and is movable inside the blade so that it can be returned to its original position.

[For production]

According to the coil insertion device of the present invention, the protrusions are arranged radially inside the stripper and are slidable from the inside of the blade to the slot of the stator core, thereby pressing the stator coil in each slot and pressing the stator coil in each slot. Easy to return after insertion. The outer cross-section of the protrusion was made similar to the cross-sectional shape of the wedge, its cross-sectional area was slightly larger than that of the wedge, and it was positioned directly above the wedge, so there was a gap immediately below the outer cross-section. Therefore, even if the stator coil has a high space factor as the stripper rises, frictional resistance due to contact is no longer generated between the wedge and the stator coil.

In addition, by providing a blade relief in the blade, even if the shape of the outer end surface of the protrusion increases with the slot shape, the protrusion passes through the inside and outside of the blade before inserting the stator coil and is placed at the slot entrance inner wall position. become able to.

Further, after the coil insertion is completed, the protrusion is arranged inside the stripper so as to exceed the upper end of the blade, and by moving it inside the blade without being blocked by the blade, the stripper can be lowered.

〔Example〕

Embodiment I of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a coil insertion device according to an embodiment of the present invention. The configuration of this figure will be explained. This figure shows a stator core 9, a number of slots 10 provided in the stator core 9, and a stator coil 11 inserted into the slots.
and a stator coil 11 inserted into the slot 10.
a wedge 12 that prevents the stator core 9 from falling off;
a ring body 20 into which the ring body is fitted;
A book blade 21 is included. FIG. 2 is a plan view of the main part of FIG. 1. This figure includes a gap 22 of a predetermined width between adjacent blades 21, and the stator coil 11 is hooked and held in the gap 22. Further, FIG. 1 shows the blade 21
A blade holder 23 that holds the stator coil 11 in an annular shape, a bed plate 24 that fixes the blade holder 23, and a stripper 25 that pushes the stator coil 11 into the slot 10.
and a gap 2 between the blades 21 on the outer periphery of the stripper 25.
12 protrusions 26 formed to fit into 2;
A notched corner portion 27 formed at the upper end of the protrusion 26, a foot portion 28 provided on the bottom surface, a flange 29 formed on the foot portion 28, a hollow portion 30 inside the stripper 25, and a second As shown in the figure, 12 grooves 31 are formed inside the stripper 25.
runs radially in the radial direction, communicates the hollow portion 30 with the outer peripheral surface of the stripper 25, and the gap 2 is formed on an extension line thereof.
2, a protrusion 33 that is slidably fitted into each groove 31, and an outer end surface portion 33b of the protrusion 33 that is slightly smaller than the outer end surface when the wedge 12 is inserted. a diagonal side 34 that functions as a cam surface within the hollow portion 30; and a cross section that forms the oblique side 34 and is displaceable in the axial direction of the stripper 25. A trapezoidal cam 35, a bolt 36 that fixes the cam 35 to a rod 49, which will be described later, a slope 37 formed on the inner end surface of each protrusion 33, and a recess 38 formed on the upper surface of the protrusion 33. , a ring-shaped spring 39 attached to the recess 38, whose urging force always presses the slope 37 against the cam surface 34, and when the cam 35 is displaced upward, the protrusion 33 is moved into the groove 31. and a wedge pusher 40 that pushes up the wedge 12 and is integrally fixed to the bottom surface of the stripper 25, with its outer end surface pushing the wedge 12 up. It protrudes slightly from the outer peripheral surface of the stripper 25 so that the stripper 25 can be placed thereon, and the upper end of the wedge 12 is positioned slightly below the lower end surface 33a of the protrusion 33 when the wedge 12 is placed on the wedge pusher upper surface 40a. A height dimension of the protrusion 33 and the wedge pusher 40 is set, a bolt 41 that fixes the wedge pusher 40, a cylinder case 43 to which the flange 29 and its upper end are fixed, and the cylinder. A bolt 44 that fixes the case 43, a bolt 45 that fixes the lower end of the cylinder case 43,
The leg part 28 of the stripper 25 is fitted into the frame 46 which is fixed by the bolt 45 and can be reciprocated in the vertical direction by a hydraulic cylinder or the like, and the cylinder case 43, and the leg part 28 and the cylinder case. A plug 47 that fits into the lower end opening of the plug 43;
7 and a piston rod 49 to which the cam 35 is fixed by the bolt 36 and slidably inserted into the leg portion 28 as described above, and the piston rod 49 is connected to the piston chamber 48 defined by , a piston 50 slidably fitted into the piston chamber 48, a rod chamber 51 bored at the lower end of the foot 28, a flow path 52 for supplying pressurized liquid, and the cylinder case 43. a head chamber 53 defined by an inner wall of the plug 47 and a peripheral wall of the plug 47;
A flow path 54 that can supply pressurized liquid to the head chamber 53, a bolt 55 that is screwed onto the upper surface of the stripper 25 and is a stopper that regulates the rising height position of the cam, and an O-ring 56 for preventing liquid leakage. , 57 , 58 , 59 , and a holding jig 6 for preventing the stator core 9 from coming out when the stator core 9 is fitted onto the outer periphery of the blade 21 .
0 and an O-ring 61 for preventing liquid leakage.

Next, the projection 33 will be explained. Figure 3 is the ■− of Figure 1.
(2) A diagram showing the relationship between the protrusion and the stator core in cross section. The blades 21 in this figure have a protrusion 33 having an outer end surface portion 33b that pushes the stator coil 11.
A relief 21a that can protrude outward is provided. The protrusion 33 moves forward and backward via the cam 35, but before starting the coil insertion, the stator core 9 is at a position outside the blade 21 and is indicated by a dotted line.
It advances to a position corresponding to the entrance inner wall 10a of the slot 10 via the relief 21a.

FIG. 4 is a partial side sectional view of the coil being inserted in the middle.

This figure includes the projections 33 that push the stator coils 11 into the slots 10. FIG. 5 is a partial plan cross-sectional view of the protrusion in FIG. 4 when the coil is inserted. As shown in this figure, the width dimension of the cross-sectional shape of the wedge 12 is b and the thickness dimension is t, but the protrusion 33 is formed in a similar shape that is slightly larger than the wedge 12, and its width dimension B1 thickness dimension is B>b as T
, Tit. The protrusion 33 has its outer end surface portion 33b located near the slot population of the stator coil 1.
1 applies a pushing force to the stator coil 11 toward the slot depth 10b of the slot 10.

Next, a series of operations of the coil insertion device according to this embodiment will be explained. The stator coil 11 is inserted into the slot 10 of the stator core 9 using the coil insertion device having the above configuration.
To insert the wedge 12, the cylinder case 43 is lowered using a hydraulic cylinder or the like, and the stripper 25 and wedge pusher 40 are moved to the position shown in FIG. At this position, the wedge 12 is loaded along the blade 21 and placed on the wedge pusher 40, and then the stator coil 11 is hooked and held between the gaps 22 of the adjacent blades 210, and the stator core 9 is fitted onto the outer periphery of the ring body 20. They are then held together using a holding jig 60 so that they do not come out.

Next, pressure fluid is supplied to the head chamber 53 through the flow path 54 to raise the piston 50 and displace the cam 35 upward to a position regulated by the stopper 55. As the cam 35 is displaced, the protrusions 33 in sliding contact with the cam surface 34 are pushed apart against the biasing force of the spring 39 and protrude from the outer peripheral surface of the stopper 25. Then, the outer end surface portion 33b of the protrusion 33
is located at the entrance inner wall 10a of the slot 10 via the relief 21a of the blade 21.

After the above preparations, when the cylinder case 43 is raised by a hydraulic cylinder or the like, the stripper 25 also rises, and the stator coil 11 is hooked on the notched corner part 27 of the stripper 25 and pushed up along the blade 21. It is inserted into the slot 10. The protrusion 33 enters the slot 10 following the stator coil 11 and enters the inlet inner wall 1.
It rises along 0a together with the stripper 25. The wedge 12 is also pushed up by the wedge pusher 40 and inserted into the slot 12.

FIG. 6 is a partial perspective view of a protrusion that pushes the stator coil. Since the stator coil 11 tends to fall inward toward the center of the stator core 9 as shown in FIG. 4, when the protrusion 33 rises, the stator coil 11 is pushed toward the outer circumference of the slot as shown in FIG.

Therefore, a gap 70 having an area of width B of the protrusion x thickness T of the protrusion is formed directly below the lower end surface 33a of the protrusion 33. The upper end 12a of the wedge 12 enters into this gap 70 while rising, so it does not come into direct contact with the stator coil 11. Furthermore, while pressing the coil 11 with the outer terminal portion 33b of the protrusion 33, the outer terminal portion 3 of the protrusion 33
Wedge 1 is attached to the side portion 33C formed on the inner peripheral side than 3b.
Store 2. Therefore, while the wedge 12 is being raised by the wedge pusher 40, the contact resistance with the stator coil 11 is suppressed, and the insertion resistance is significantly reduced. In this way, the frictional resistance with the stator coil 11 can be suppressed, so even when the stator coil 11 is inserted in a so-called high capacity, it is possible to prevent damage to the wedge 12 as in the conventional case. Note that the pressure applied to the stator coil 11 by the protrusion 33 disappears when the stator coil 11 is pushed away to the slot depth 10b.

FIG. 7 is a partial side sectional view when the coil insertion is completed. When the stator coil 11 and the wedge 2 are inserted into the slot 10 of the stator core 9 as shown in this figure, the coil insertion for one phase is completed.

FIG. 8 is a partial sectional view showing the state in which the protrusion is returned to the inside of the blade after the coil is inserted. Stripper 2 as shown in Figure 7
When trying to lower 5 to prepare for the next insertion, protrusion 3
3 collides with the inserted stator coil 11 and wedge 12. Therefore, when pressure fluid is supplied to the rod chamber 51 through the flow path 52 and the piston 50 is lowered until it contacts the flag 47, and the cam 35 is returned to its original position, the protrusion 33 is also returned to its original position by the spring 39. Then, as shown in Fig. 8, the protrusion returns to the inside of the blade. In this case, the protrusion 33 is made to protrude a distance a from the upper surface of the blade when the insertion is completed so that it does not get caught when returning to the inside of the blade, and further inward by a distance a so that it does not get caught on the blade 21 when lowering the stripper 25. Move to. Thereafter, the stripper 25 and wedge pusher 40 are moved to the position shown in FIG. 1 by lowering the cylinder case 43 using a hydraulic cylinder or the like.

〔Effect of the invention〕

As described above, according to the present invention, a path for the wedge can be developed by scraping the stator coil like a snowplow, so there is no need for the wedge to directly press the coil and insert it. It prevents wedge damage (specifically buckling, bending, bending, etc.) and protrusion outside the slot, which previously occurred, and reduces the slot space factor to 1.
Even with 0.00% products, the wedge can be easily inserted without degrading the insulation between the coil and core. This will lead to further improvements in the size and output of products, and is expected to further improve quality.

[Brief explanation of the drawings] 1st I! 1 is a schematic side view of the coil insertion device according to the embodiment of the present invention, FIG. 2 is a plan view of the main part of FIG. 1, and FIG. 3 is the relationship between the protrusion and the stator core in the ■-■ cross section of FIG. Figure 4 is a partial side sectional view of the coil being inserted halfway through, Figure 5 is the
Fig. 6 is a partial perspective view of the protrusion pushing the stator core, Fig. 7 is a partial side sectional view when coil insertion is complete, and Fig. 8 shows the protrusion after coil insertion. FIG. 9 is a schematic side view of a conventional coil insertion device; FIG. 10 is a partial side sectional view of the conventional coil insertion device in the middle of coil insertion; FIG. 11 is a diagram showing how the notch corner reaches near the upper end surface of the stator core in Figure 10, Figure 12 is a partial plan cross-sectional view of the conventional protrusion when the stripper is stopped, and Figure 13 is the protruding conventional protrusion. FIG. 14 is a diagram showing the amount of movement of the conventional protrusion when the space factor of the stator coil increases. In the figure, 9... stator core, 10... slot, 11...
- Stator coil, 12... Wedge, 21... Blade, 25... Stripper, 27... Notch corner part, 30... Hollow part, 33... Protrusion, 35...
...Cam, 39...Spring, 40...Wedge pusher, 49...Piston rod. A plan view of the main part of FIG. 1. FIG. 2 is also a diagram. FIG. 4 is a partial plane cross-sectional view of the protrusion when the coil is inserted. FIG. a A partial perspective view of a protrusion that presses the stator coil FIG. 6 A schematic side view of a conventional coil insertion device FIG. 9 A partial plan sectional view of a conventional protrusion when the stripper is stopped Partial cross-sectional view of the child No. 13! a

Claims (1)

[Scope of Claims] 1. A blade consisting of a plurality of blades arranged in an annular shape with a gap between them, with a stator coil sandwiched in the gap and a stator core fitted on the outer periphery, and a blade that is driven forward and backward along the blade. At the same time, a protrusion that enters into the gap is formed on the outer periphery, a notched corner is formed at the upper end of the protrusion, and a stripper that inserts the stator coil into the slot of the stator core by forward drive, and a wedge for fixing the stator coil in the slot. A coil insertion device comprising a wedge pusher driven integrally with the stripper for insertion, the wedge pusher being arranged radially inside the stripper and slidable between the blade and the slot of the stator core. A coil insertion device comprising a protrusion having an outer end surface portion that presses the stator coil, and the outer end surface portion is located directly above the wedge when the stator coil is inserted. 2. The coil insertion device according to claim 1, wherein the outer end face portion has a cross-sectional shape similar to the wedge shape, and has a cross-sectional area having a thickness equal to or greater than the thickness of the wedge, and a width equal to or greater than the width of the wedge. . 3. The blade is provided with a blade relief that allows the protrusion to move in and out of the blade, and before inserting the stator coil, the outer end surface of the protrusion is inserted into the slot through the blade relief. 2. The coil insertion device according to claim 1, wherein the coil insertion device is disposed at an inlet inner wall position of the coil insertion device. 4. The protrusion according to claim 1, wherein after the coil insertion is completed, the protrusion is arranged inside the stripper so as to exceed the upper end of the blade, so that it can be moved inside the blade and returned to its original position. Coil insertion device. 5. Consisting of a plurality of blades arranged in an annular shape with a gap maintained between them, the stator coil is sandwiched in the gap, and the stator core is fitted on the outer periphery of the blade, and the blade is driven forward and backward along the blade, and the blade is arranged around the outer periphery within the gap. a stripper for inserting a protrusion into which a stator coil is inserted into a slot of a stator core by forward driving; a stripper for moving a stator coil fixing wedge into the slot; A coil insertion device including a wedge pusher that is integrally driven, the coil insertion device being arranged radially inside the stripper and slidable between the inside of the blade and the slot of the stator core; 1. A coil insertion device comprising: a pressing part that presses the wedge; and a protrusion that is formed on the inner circumferential side of the pressing part and has a storage part that stores the wedge.