JPH0440933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for inserting a stator coil into a slot in a stator core of a rotating electric machine.

[Technical background of the invention]

FIG. 1 is a schematic, partially sectional elevational view of a stator coil insertion device common to the conventional art and an embodiment of the present invention. Fig. 2 is a longitudinal cross-sectional view of the main parts of the conventional device shown in Fig. 1, which is shown in the middle of stator coil insertion and wedge insertion, laid down on its side (not actually laid down); FIG. 3 is a cross-sectional view of the stator core slot portion after the stator coil and wedge are inserted in the device.

In Figures 1 to 3, slot insulating paper 3 is inserted in a U-shape into a plurality of axial slots 2 on the inner circumferential surface of a cylindrical stator core 1, and is fixed to the inner circumferential surface of the core. A plurality of blades 6 of the child coil insertion device 5 are inserted. In this stator coil insertion device 5, a stator coil 7 wound by a separate machine (not shown) is hooked onto a blade 6, and a disc-shaped stripper 9 having a protrusion 9a sandwiched between the blades 6 is inserted. A wedge 8, which is supported on the upper part of the presser 10 and manufactured by a separate machine (not shown), is set along the blade 6 and at the upper part of the pressurer 10 along a wedge guide 18.

From the state shown in FIG. 1, the stripper 9 driven by a drive mechanism (not shown) and the pusher 10 driven simultaneously move in the direction of the arrow 11 in FIGS. 1 and 2, and the stator coil 7
and insert the wedge 8 into the insulating paper 3 in the slot 2. The stator coil 7 is pushed between the blades 6 by the stripper 9 in the direction of the arrow 11 and inserted into the insulating paper 3 in the slot 2, and at the same time the wedge 8 pushed in the direction of the arrow 11 by the pusher 10 is also inserted. As shown in FIG. 3, the stator coil 7 is inserted into the insulating paper 3 in the slot 2 to prevent the stator coil 7 from popping out from the opening 12 of the slot 2.

[Problems with the Background Art] However, when the ratio of the cross-sectional area of the stator coil 7 to the cross-sectional area of the slot 2 increases, the reaction force of the stator coil 7 causes the wedge 8 to open as shown by the broken line 13. This was one of the biggest causes of product defects.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a stator coil insertion device in which the wedge does not protrude from the slot opening and cause insulation failure.

[Summary of the invention]

In the present invention, when inserting the stator coil into the axial slot on the inner peripheral surface of the cylindrical stator core,
It has a blade that hooks the stator coil and inserts it into the inner peripheral surface of the iron core to guide the stator coil,
A stripper and a pusher are press-fitted into the inner circumferential side of the iron core along with this blade, and the stator coil is inserted into the slot using the stripper, and the stator is inserted into the upper part of the coil in the slot while the wedge is aligned with the base of the stripper using the pusher. In the coil insertion device, when inserting the stator coil and wedge into the slot, by increasing the radius so that the coil abutting part at the tip of the stripper goes 0.3 to 2.0 mm inside the tip part of the slot. , the stripper rises while pressing the coil to the bottom of the slot with the coil abutting part at its tip, so a space is formed at the top of the wedge, and the wedge is inserted smoothly with less resistance, and the stripper can be inserted into the coil. When returning to the position before insertion, the coil contact portion passes over the wedge and presses the wedge into the slot against the reaction force of the coil to soften the springback of the coil and allow it to settle down. .

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 4 to 6. A schematic diagram of the entire apparatus is shown in FIG. 1, so please refer to this as well. FIG. 4 is a longitudinal cross-sectional view of the main part showing the state in which the stator coil 7 and wedge 8 have begun to be inserted into the insulating paper 3 in the slot 2 of the stator core 1, turned sideways (not actually turned over). 5, the stator coil 7 and wedge 8 are all inserted into the insulating paper 3 in the slot 2.
This is a cross-sectional view showing the state in which the stripper 9 has been inserted into the slot 2, turned sideways (not actually turned over), and Figure 6 shows the stripper 9 being pushed back a little from the position shown in Figure 5 to press the wedge 8 into the slot 2. FIG.

In this embodiment, the radius of the coil contacting part 14 at the tip of the stripper 9 is made larger so that it enters 0.3 to 2.0 mm inside the tip part 17 of the slot 2.
In addition, the root portion of the stripper 9, that is, the wedge contact portion 1
5 has the same outer diameter as the conventional one, and is characterized by a transition from the wedge abutting part 15 to the coil abutting part 14 at the tip by a tapered part 16, and the other features are as follows.
This is as explained in FIG.

Next, the effect will be explained.

A wedge 8 manufactured by a separate machine (not shown) is set on the pusher 10 along a wedge guide 18,
Further, the stator coil 7 wound by another machine (not shown) is hooked onto the blade 6, and the protrusion 9a sandwiched between the blades 6 and the tip portion 1 of the slot 2 are hooked onto the blade 6.
The stator core 1 is supported on the upper part of a disk-shaped stripper 9 having a coil abutment part 14 with a larger radius so as to enter inside the stator core 1 by 0.3 to 2.0 mm.
Insert the blade 6 into the inner circumferential side. Then, a drive device (not shown) drives the stripper 9 and the pusher 10 to simultaneously push the stripper 9 and the pusher 10 in the direction of the arrow 11, thereby simultaneously driving the stator coil 7 and the wedge 8 through the U-shaped insulation in the slot 2 of the stator core 1. When the stripper 9 is inserted into the paper 3, the stripper 9 rises while pressing the coil against the bottom of the slot by the coil abutting part at its tip, so a space is formed above the rising wedge and the insertion resistance of the wedge is reduced. , inserted smoothly. The state after this insertion is shown in FIG. 5 as described above. Then, the stripper 9 is pulled in the direction of the arrow 19 and returned to the position before the coil insertion. The state in the middle of being pulled back is shown in FIG. 6 as described above. This is because the coil abutting part 14 at the tip smoothly rides on the wedge 8 via the tapered part 16, pushes the stator coil 7 from above the wedge 8 into the bottom side of the slot 2, and the spring of the stator coil 7 This shows a state in which the force applied to the wedge 8 is weakened by softening the back and reducing the reaction force. Therefore, even after the stripper 9 is pulled out, the stator coil 7 does not push out the wedge 8 from the slot opening 12, thereby preventing poor insulation and providing a rotating electric machine with stable quality. Thus, the coil abutting portion 14 at the tip is connected to the slot 2.
The reason why the screw is inserted into the slot 2 within a range of 0.3 to 2.0 mm from the tip portion 17 is that if it is smaller than 0.3 mm, the force pushing the stator coil 7 from above the wedge 8 will be weak and less effective. This is because if it is larger than mm, the force pushing the wedge 8 and stator coil 7 when pulling out the stripper 9 will be too large, damaging the wedge 8 and potentially damaging the stator coil 7 as well. Further, if the cross-sectional area of the stator coil 7 is small and there is no risk of damage to the wedge 8 or the stator coil 7, there is no need to press the stator coil 7 from above the wedge 8 any further.

〔Effect of the invention〕

As explained above, according to the present invention, when the stator coil and the wedge are inserted into the slot, the stripper moves up while pressing the coil against the bottom of the slot by the coil abutting portion at its tip, so that the stripper presses the coil against the bottom of the slot and presses the coil against the bottom of the slot. A space is formed, and the wedge is inserted smoothly with less resistance. Furthermore, when the stripper is pulled out, the stator coil is pressed from above the wedge by the coil abutting part at the tip of the stripper, which weakens the reaction force due to spring back in the slot of the stator coil, allowing the slot opening to It is possible to obtain a stator coil insertion device that can prevent wedges from flying out, eliminate insulation defects, and has a great effect on improving the quality of rotating electric machines.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional elevational view schematically showing a stator coil insertion device common to the conventional method and an embodiment of the present invention, and FIG. 2 is a stator coil and FIG. 3 is a cross-sectional view of the main part showing the state in the middle of wedge insertion, FIG. 3 is a cross-sectional view of the stator coil and stator core slot after inserting the wedge in the device shown in FIG. 2, and FIG. 4 is the main part shown in FIG. 1. FIG. 5 is a longitudinal cross-sectional view of a main part showing a state in which a stator coil and a wedge are being inserted in the device according to an embodiment of the invention, and FIG. 5 shows a state in which the stator coil and wedge have been inserted using the device shown in FIG. FIG. 6 is a cross-sectional view of the slot portion showing a state in which the stripper is slightly returned from the position shown in FIG. 5. 1...Stator core, 2...Slot, 6...Blade, 7...Stator coil, 8...Wedge, 9...
Stripper, 10... Pusher, 14... Coil contact portion at the tip, 17... Tip portion of the slot.

Claims (1)

[Claims] 1. When inserting the stator coil into the axial slot of the inner peripheral surface of the cylindrical stator core, the blade has a blade that hooks the stator coil, inserts it into the inner peripheral surface of the core, and guides the stator coil, A stripper and a pusher are press-fitted into the inner circumferential side of the iron core along with this blade, and the stator coil is inserted into the slot using the stripper, and the stator is inserted into the upper part of the coil in the slot while the wedge is aligned with the base of the stripper using the pusher. 1. A stator coil insertion device, characterized in that the radius of the coil abutment portion at the tip of the stripper is increased so that it enters 0.3 to 2.0 mm inside the tip portion of the slot with respect to the root portion of the stripper.