JPH1155909A - Formation method for slot insulator of electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a slot insulator with high efficiency and improved impregnation. SOLUTION: In the slot insulator which is inserted for the purpose of insulation to ground between the coil 6 and the iron core 8 of an electric apparatus impregnated with insulating oil by drop impregnation, a tape 2 for slot insulation is wound a little longer than the length of a slot by half overlap winding on a bar which has the sectional form of such dimension that the thickness of the slot insulator, the thickness of a flaw preventive sheet 3, and the margin space 4 are subtracted from the dimension of the sectional form of the slot and besides is longer than the length of the slot. Then, the flaw preventive sheet 3 is wound around it, and after insertion from the top or side of the slot 1, the flaw preventive sheet 3 is pulled out for removal, and the slot insulating tape 2 at the section applicable to the center of the slot part is cut in the longitudinal direction of the slot, whereby the slot insulating tape 2 separates from the bar by the firmness of itself, and sticks fast to the inner face of the slot thereby forming the slot insulator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming slot insulation in electric equipment.

[0002]

2. Description of the Related Art Conventionally, slot insulation is performed in a slot insulation cutting step of cutting a rectangular insulating sheet adapted to the dimensions of the slot cross section and the slot length from a raw material of an insulating sheet having an appropriate thickness. ing. In the slot insulating step of inserting the cut insulating sheet into the slot, the insulating sheet is inserted from the upper part when the opening at the upper part of the slot is wide, and from the side part when the opening at the upper part of the slot is narrow. Here, since the slot insulation is intended for ground insulation, the thickness of the insulating sheet is generally increased.

[0003] Next, a coil is inserted into the slot insulation, and an opening at the top of the slot is closed with a wedge or you piece, thereby performing a coil slotting step. Furthermore,
A drop impregnation step is performed in which the varnish is dropped and impregnated by dropping the varnish on the end portion of the coil. At this time, the varnish is easily impregnated between the turns of the coil or the gap between the coil and the slot insulation. In this way, the varnish impregnated by dropping is thermally cured, and the slot insulation is performed in the thermosetting step of varnish for fixing the coil and the slot insulation, and the slot insulation and the iron core.

[0004]

However, such a process has the following problems. 1 In the slot insulation cutting process, scraps smaller than the required slot insulation sheet size are produced, so it is impossible to use all the raw material for slot insulation.
The cost increases accordingly. (2) In the slot insertion process of slot insulation, since the thickness of the slot insulation sheet is large, if the width of the slot cross section is small, the rigidity of the slot insulation sheet itself makes insertion into the slot difficult, Forcibly inserting the slot insulating sheet into the iron core rubs against the iron core, causing damage, and lowering the insulating performance. 3 In order to prevent this, it is only necessary to insert the scratch prevention sheet between the iron core and the slot insulating sheet, but after insertion, the slot insulating sheet may Since the iron core is in close contact, it is difficult to remove the scratch prevention sheet.

[0005] 4 In order to facilitate insertion without using a scratch prevention sheet, it is necessary to heat-press the slot insulating sheet in advance so that the sheet has an appropriate shape.
The cost increases accordingly. 5 In the drip impregnation step, the slot insulation is a sheet between the slot insulation and the iron core, so that the varnish is impregnated through the slot insulation sheet through the gap between the coil and the slot insulation where the varnish is easily impregnated. It will not be done. Therefore, since the impregnation can be performed only from the gap between the slot insulation on the side surface of the slot and the iron core, the varnish is sufficiently impregnated between the slot insulation and the iron core, and has a sufficient adhesive force in the subsequent varnish thermosetting step. It takes 30 minutes for the dropping and impregnating step to obtain, and the cost increases for a long time. The present invention has been made in view of the above points,
It is an object of the present invention to provide a method of forming a slot insulation which solves these problems.

[0006]

Means for achieving the object are as follows: 1) In the first aspect, in the slot insulation inserted between the coil and the iron core of the electric equipment, the shape of the cross section of the slot is changed. From the dimensions, the slot insulation thickness, slot insulation,
After winding the slot insulating tape half-lap over a rod having a cross-sectional shape with the margin gap between the iron cores subtracted, insert the slot insulating tape into the slot, and insert the slot insulating tape at the center of the upper part of the slot along the slot length direction. In this method, the slot insulating tape is separated from the rod by its own stiffness, and closely adheres to the inner surface of the slot to form slot insulation.

2) In the slot insulation inserted between the coil and the iron core of the electric equipment impregnated by the drop impregnation for the purpose of insulating the ground, the shape of the slot cross section is determined based on the dimensions of the slot cross section. The thickness of the scratch prevention sheet wound around the outside of the slot insulation and the cross-sectional shape of the dimension obtained by subtracting the marginal gap between the damage prevention sheet and the iron core, and the tape for slot insulation is applied to a rod longer than the slot length. Wrap a little longer than the slot length with half lap winding,
After wrapping the anti-scratch sheet around it and inserting it from the top or side of the slot, pull out the anti-scratch sheet and remove it, and cut the slot insulating tape at the center of the top of the slot along the slot length direction This is a method in which the slot insulating tape is separated from the rod by its own stiffness and closely adheres to the inner surface of the slot to form slot insulation. Note that, in claim 1, claim 2
The wound prevention sheet may be wound in the same manner as described above.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view of a slot, FIG. 3 is a perspective view of a slot insulating tape, FIG. 4 is a perspective view of a scratch prevention sheet, and FIG. FIG. 6 is a sectional view of the slot after the coil, the slot insulation and the iron core are fixed.

Hereinafter, a description will be given with reference to claim 2 including claim 1. 1 and 2, in slot insulation inserted between a coil and an iron core of an electric device impregnated by drip impregnation to perform ground insulation, the slot shape shown in FIG. The thickness of the insulation, the thickness of the anti-scratch sheet 3 shown in FIG. 4 wound around the slot insulation, and the cross-sectional shape of the dimensions obtained by subtracting the marginal gap 4 between the anti-scratch sheet 3 and the iron core 8, and the slot length 5 is wound a little longer than the slot length by half-lap winding the slot insulating tape 2 shown in FIG. 3 around the rod 5 shown in FIG. After the insertion, the scratch prevention sheet 3 is pulled out and removed, and the slot insulating tape 2 at the center of the upper portion of the slot is cut along the slot length direction to thereby provide slot insulation. Away from the rod 5-loop 2 is the strength of its own hip, a method of forming a slot insulation in close contact with the inner surface of the slot 1. Note that 6
Is a coil, and 7 is a youpiece. Further, in the first embodiment, the scratch prevention sheet 3 may be used. Further, the shape of the slot cross section is not limited.

In FIG. 3, a tape 2 for slot insulation is used.
FIG. 2 is a perspective view of (a polyester film tape having a thickness of 0.15 mm and a width of 19 mm). As other examples, slot insulating tapes having an appropriate thickness and width include PPS film tape (manufactured by Toray Industries), PEN film tape (manufactured by Teijin), Nomex tape (manufactured by Toray DuPont),
Any tape that has heat resistance and electrical insulation, such as NTN tape (manufactured by Shinko Chemical Industry Co., Ltd.) and TLT (manufactured by Toray Industries, Inc.), may be used.

FIG. 4 is a perspective view of the scratch prevention sheet 3 (0.05 Teflon film sheet) cut into an appropriate size. In addition, as another example, the scratch prevention sheet is a polyester film sheet having an appropriate thickness,
Nomex sheet (manufactured by Du Pont-Toray Co., Ltd.) should have the effect of preventing scratches and the smoothness of the sheet surface.

In FIG. 5, the cross-sectional shape has a size obtained by subtracting the thickness of the slot insulation, the thickness of the scratch prevention sheet 3 and the allowance gap 4 from the size of the shape of the slot cross section.
It is a perspective view of the stick 5 longer than the slot length. This stick 5
Then, the slot insulating tape 2 is wound in a half-lap winding slightly longer than the slot length, and the wound preventing sheet 3 is wound therearound. FIG. 1 is a cross-sectional view after this is inserted from the side surface of the slot 1.

Next, the scratch-preventing sheet 3 is pulled out and removed, and the slot insulating tape 2 at a portion a corresponding to the center of the upper portion of the slot is cut along the slot length direction. Then, the slot insulating tape 2 is separated from the rod 5 by its own stiffness, and closely adheres to the inner surface of the slot to form slot insulation.

Next, a plurality of turns of the coil 6 are placed in the slot insulation, and the opening at the top of the slot is closed with the u-piece 7, and then the varnish is dropped and impregnated by dropping the varnish onto the end of the coil 6 for 15 minutes. By thermosetting, the coil and the slot insulation, and the slot insulation and the iron core 8 are fixed. In addition, as another embodiment, you pieces may be wedges. FIG. 6 is a sectional view of the slot 1 after being fixed.
When the adhesive strength between the slot insulation and the iron core of the rotating electric machine manufactured in the above example was measured, it was confirmed that the adhesive strength was equivalent to that of the conventional one.

[0015]

As described above, according to the present invention, the following effects can be obtained with respect to the above-mentioned problems. (1) By using an insulating tape of an appropriate width slit from the raw material instead of an insulating sheet for slot insulation, no scrap is produced in the slot insulation cutting process, so that the cost does not increase. 2 Wrap the slot insulating tape half-lap around the rod a little longer than the slot length, and wrap the anti-scratch sheet around it.Therefore, in the slot insulating slotting process, the slot insulating tape rubs against the iron core and scratches it. There is no decrease in insulation performance. 3 Further, since this rod is designed in advance so that a marginal clearance is provided between the damage prevention sheet and the iron core, it is easy to remove the damage prevention sheet. 4 Since the tape for slot insulation is wrapped around the rod,
There is no need to heat-press in advance, which does not increase costs. 5 In the drip impregnation step, in addition to the gap between the slot insulation and the iron core, the slot insulation and the core are in close contact with each other. There is a gap from the gap between the coil and the slot insulation, which is easily impregnated, through the slot insulation and impregnated with the varnish. Therefore, the varnish is sufficiently impregnated between the slot insulation and the iron core, and in the subsequent thermosetting process of the varnish, the drop impregnation process takes only 15 minutes to obtain a sufficient fixing force. Not up.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a slot.

FIG. 3 is a perspective view of a tape for slot insulation.

FIG. 4 is a perspective view of a scratch prevention tape.

FIG. 5 is a perspective view of a rod having a cross-sectional shape of a size obtained by subtracting the thickness of the slot insulation, the thickness of the scratch prevention sheet, and a margin from the size of the shape of the slot cross-section, and being longer than the slot length.

FIG. 6 is a cross-sectional view of the slot after the coil, slot insulation, and iron core are fixed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slot 2 Slot insulating tape 3 Scratch prevention sheet 4 Clearance gap 5 Bar 6 Coil 7 Youpiece 8 Iron core

Claims (2)

[Claims] In a slot insulation inserted between a coil and an iron core of an electric device, a thickness of the slot insulation and a clearance between the slot insulation and the iron core are subtracted from a dimension of a cross section of the slot. For a rod with a cross-sectional shape,
After winding the slot insulating tape half-lap, insert it into the slot and cut the part of the slot insulating tape at the center of the top of the slot along the slot length direction, so that the slot insulating tape has its own waist strength A method for forming a slot insulation of an electric device, wherein the slot insulation is formed so as to be separated from a rod and in close contact with an inner surface of the slot. 2. A slot insulation inserted between a coil and an iron core of an electric device impregnated by dropping impregnation to perform ground insulation. The thickness of the anti-scratch sheet wound around the outside of the slot, the cross-sectional shape of the dimension minus the extra clearance between the anti-scratch sheet and the iron core, and a slot longer than the slot length by half-wrapping a slot insulating tape on a rod longer than the slot length Wrap it slightly longer than the length, wrap the anti-scratch sheet around it, insert it from the top or side of the slot, pull out the anti-scratch sheet, remove it, and remove the slot insulating tape at the center of the top of the slot in the slot length direction The slot insulation tape separates from the rod due to its own stiffness, and the slot A method for forming slot insulation for electric equipment, comprising forming slot insulation.