JPH0880005A - Method for fixing field coil and dynamo-electric machine - Google Patents

Abstract

PURPOSE: To prevent the movement of a field coil by the clearance formed between a magnetic pole body part and a field coil. CONSTITUTION: A porous expansion type epoxy resin laminated plate (trade name; POLO-MAT) 9 where the glass fiber as the base material is non-oriented, and bent when being heated above 40 deg.C, and the lamination thickness is increased by 150-300% is inserted into the clearance formed between a magnetic pole body part 1a of a magnetic pole core 1 and the inner circumference of a coil 2. In addition, the epoxy resin is poured, and the magnetic pole core is heated and dried in a heating furnace to allow the epoxy resin to be solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a field coil incorporated in a rotary electric machine and a rotary electric machine.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view showing an example of one pole of a magnetic pole of a rotor of a conventional salient pole type rotary electric machine. In FIG. 3, on the outer circumference of the magnetic pole body portion 1a of the T-shaped magnetic pole core 1,
The coil 2 formed as shown in the perspective view of FIG. 4 is inserted. An insulating plate 12 is inserted in advance on the magnetic pole head 1b side of the coil 2 before the coil 2 is inserted.

An interlayer insulating plate 6 is inserted between the layers of the coil 2, and an insulating plate 12 is also inserted in advance at the rotor shaft side end of the magnetic pole body 1a. (Note: Figure 3
In, the portion indicated by the alternate long and short dash line on the right side of the magnetic pole body 1a has the same shape as the left side of the magnetic pole body 1a. ) A ground insulating sheet 3 is inserted into a gap 4 formed between the outer circumference of the magnetic pole body portion 1a and the inner circumference of the coil 2, and between the outer surface side of the ground insulating sheet 3 and the inner circumference of the coil 2. Insulation laminate 5 made of glass fiber reinforced epoxy resin laminate is inserted.

In the salient pole type rotating electric machine constructed as described above, the insulating laminated plate 5 has a gap 4 formed between the ground insulating sheet 3 and the inner circumference of the coil 2, as shown in FIG. According to the width, one insulating laminated plate 5 or a plurality of insulating laminated plates 5 are selected with a plate thickness and then hammered with a wooden hammer or the like.
A trapezoidal tab tail (not shown) is provided at the center of the magnetic pole body 1a on the rotor side, and is fixed to the rotor shaft side via a cotter key (not shown).

[0005]

However, in the salient pole type rotating electric machine having the magnetic poles constructed as described above, the ground insulating sheet, 3 and the insulating laminated plate 5 are inserted in the sectional view of the magnetic pole shown in FIG. As shown in FIG. 5 which shows a state before being formed, a gap 4 formed between the inner circumference of the coil 2 and the magnetic pole body portion 1a.
Varies slightly each time depending on the coil 2 into which the shape and dimensions are inserted.

[0006] This is because in the process of winding and forming a rectangular copper wire using a wooden hammer while rotating a winding die (not shown), the elliptical bending shape is slightly different for each layer.
This is because the inner winding width W shown in FIG. 4 differs for each layer depending on the location.

This also applies to the thickness H1 of the entire coil. Factors in which the winding width W and the coil thickness H1 are different are that by bending the left and right in an arc shape as shown in FIG. 4, the thickness of the rectangular copper wire on the inner peripheral side of the arc-shaped portion increases and the coil is wound. This is also due to variations in the thickness and width of the flat copper wire, which are within the permissible range.

Therefore, as shown in FIG. 6, the method of forming the coil 2 by the plastic deformation as shown in FIG. 4 may be changed to a method of connecting the ends of the strip-shaped strips by brazing.

According to this method, although the partial deformation of each strip is eliminated, the connecting portion has a butt shape, so that the difference in the plate thickness of the end portion and the silver braze flowing out from the joining portion cause a difference in the shape of FIG. In addition to the possibility that the coil thickness H2 shown in (1) may be partially different, brazing takes a long time, and there is a drawback that the work becomes hot work.

In order to eliminate the increase in the coil thickness H2, it is necessary to machine the surface of the brazing strip in the plate thickness direction, but this work is particularly difficult because of the copper material. Is. This is because when the thickness of the plate is reduced by the hand grinder, the grinder is clogged with the copper powder.

Therefore, as shown in the gap 4 on the right side of FIG. 7, although the width of the insulating laminated plate 5 in the coil laminating direction is changed depending on the shape of the gap on the inner circumference of the coil 2,
Then, this width is different for each coil,
This is a trial-and-error operation of so-called physical matching, which not only takes time, but also a partial gap cannot be eliminated as shown in the central portion on the left side of FIG. 7 and the lower and central portions on the right side.

In the magnetic pole with the gap thus formed, during operation for a long period of time, the coil layer in the portion where the gap is formed moves inward at every start / stop of acceleration / deceleration of the rotating electric machine, Alternatively, the thickness of the insulating laminated plate 5 that is moved outward and hit by the coil material decreases each time, and as a result, the gap further expands, and finally the coil material and the interlayer insulating paper 6 are displaced from each other. Therefore, there is a risk of short circuit between the layers.

Therefore, an object of the present invention is to prevent the field coil from moving due to the gap between the magnetic pole body and the field coil, and to extend the electrical and mechanical life over a long period with a constant quality. A method of fixing a field coil and a rotating electric machine are provided.

[0014]

According to a first aspect of the present invention, there is provided a method for fixing a field coil, wherein a glass mat which is deformed by heating is inserted into a gap between the coil inserted into the pole barrel and the pole barrel. It is characterized in that an epoxy resin is injected between the coil and the pole body, and the epoxy resin is heated, cured and dried.

Further, in the rotating electric machine according to the second aspect of the present invention, a glass mat which is inserted between a pole barrel and a coil attached to the outer periphery of the pole barrel and which is deformed by heating, a pole barrel and a coil. It is characterized in that it is provided with an epoxy resin layer which is filled in between and which is heated, cured and dried.

[0016]

[Operation] In the gap formed between the pole body and the coil,
It is filled with a gas mat deformed by heating and an insulating layer of an epoxy resin filled and cured between the gas mat.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for fixing a field coil and a rotating electric machine according to the present invention will be described below with reference to the drawings. Figure 1
FIG. 8 is a partial vertical cross-sectional view showing an example of a method for fixing a field coil and a rotating electric machine of the present invention, and is a view corresponding to FIGS. 3 and 7 shown in the related art.

1 is different from the prior art shown in FIGS. 3 and 7 in that it will be described in detail below between the coil 2 and the outer surface of the ground insulating sheet 3 inserted outside the magnetic pole barrel 1a. As described above, the glass fiber glass mat (product name: POLOMAT) 9 that is deformed by heating is inserted after being impregnated with an epoxy resin and cured by heating.

This glass mat 9 is a porous expanded epoxy laminate with non-oriented glass fibers (Insulation classification F class of the electrical engineering field electrical standard study group standard (JEC-147)).
And, by heating to 40 ° C. or higher, the film is curved in the laminating direction and the laminating thickness is increased to 150 to 300%.

The inventor has impregnated the glass mat 9 having a thickness of 60% of the design standard size of the gap between the outer surface of the ground insulating sheet 3 and the inner circumference of the coil 2 with the epoxy resin 11 to insulate the ground. After being inserted between the outer surface of the sheet 3 and the inner periphery of the coil 2 as shown in FIG. 1, the magnetic pole head 1b is faced downward in FIG. Heat dried.

After that, as shown in FIG. 1, the magnetic pole 1 was vertically cut into 10 equal parts along with the coil 2 and the section was examined. The glass mat 9 was uniformly distributed according to the shape of the gap due to expansion. By the epoxy resin 11 filled between the glass mats 9, the cured insulating layer of the porous expanded epoxy laminate forms voids or voids between the outer surface of the ground insulating sheet 3 and the inner periphery of the coil 2. It was confirmed that it was formed without doing.

Further, in order to confirm that minute voids and voids are not formed, the inventor conducted a corona discharge test between the magnetic pole 1 and the coil 2 and found that the discharge charge amount was very small. It was

Next, FIG. 2 is a partial vertical sectional view showing another embodiment of the method for fixing the field coil and the rotating electric machine of the present invention.
It is a figure corresponding to FIG. 2 is different from FIG. 1 in that the gap 4 formed between the outer surface of the ground insulating sheet 3 and the inner surface of the coil 2 is 60% of this gap, respectively.
After inserting the two glass mats 9 in total so that the thickness becomes, the magnetic pole head 1b side is set to the lower side, so that the epoxy resin 11 is removed from between the upper magnetic pole body 1a and the coil 2. Injected.

The epoxy resin 11 penetrates into the minute gaps between the layers of the coil 2 after a certain time has elapsed after the injection, so that the injection side is settled. Therefore, the epoxy resin 11 is additionally injected until the settling is completely stopped.

After no precipitation of the epoxy resin was observed on the injection side, the epoxy resin 11 was heated and cured in a heating furnace at 150 ° C. and dried in the same manner as the magnetic pole shown in FIG.

The inventor, like the magnetic pole shown in FIG. 1, cut the magnetic pole 1 and the coil 2 vertically into 10 equal parts as shown in FIG. 2 and examined the cross section. Mat 9
Was confirmed to be curved and uniformly distributed over the entire gap as shown in the lower right part of FIG.

Therefore, in the salient pole type rotating electric machine configured as described above, the gap 4 formed between the ground insulating sheet 3 and the coil 2 is impregnated with the glass fiber material of the glass mat 9 and the gap therebetween. Since the hardened layer of epoxy resin can be completely filled, the coil 2 can be prevented from moving when the rotating electric machine is started and stopped for a long period of time, and the ground insulating layer 3 is damaged by the movement of the coil 2. Or
It is possible to prevent relative displacement between the coil 2 and the inter-turn insulation 6 inserted between the layers, and it is possible to prevent a short circuit between the layers.

Further, between the ground insulating sheet 3 and the coil 2, a hardened layer of a porous expanded epoxy laminate is formed in close contact with the ground insulating sheet 3 and the coil 2 to improve the heat transfer coefficient between the coil 2 and the magnetic pole 1. Since the cooling of the coil 2 is promoted, the coil 2
The temperature rise can be reduced, and the insulation characteristics of the coil 2 can be maintained for a long period of time.

[0029]

As described above, according to the invention of claim 1,
By inserting a glass mat that deforms by heating into the gap between the coil inserted in the pole barrel and the pole barrel, injecting epoxy resin between the coil and the pole barrel, and heating, curing and drying this epoxy resin Since the gap formed between the pole body and the coil is filled with the gas mat deformed by heating and the insulating layer of the epoxy resin filled and cured between the gas mat, the gap between the pole body and the interface is filled. It is possible to obtain a method for fixing a field coil that prevents the field coil from moving due to a gap between the field coil and the magnetic coil, has a constant quality, and extends the electrical and mechanical life over a long period of time.

According to the second aspect of the present invention, a glass mat which is inserted between the pole barrel and the coil inserted around the outer circumference of the pole barrel and which is deformed by heating, and the pole barrel and the coil. By providing an epoxy resin layer that is filled in between and heated, cured, and dried, the gap formed between the pole body and the coil is filled with gas mat deformed by heating and this gas mat is cured. Since the insulating layer of the epoxy resin is filled, the movement of the field coil due to the gap between the pole body and the field coil is prevented, and the quality is constant.
It is possible to obtain a method for fixing a field coil and a rotating electric machine that can extend electrical and mechanical life over a long period of time.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing an embodiment of a method for fixing a field coil of the invention described in claim 1 and an embodiment of a rotating electric machine of the invention described in claim 2.

FIG. 2 is a partial vertical cross-sectional view showing another embodiment of the method for fixing a field coil according to the first aspect of the invention and the rotating electric machine according to the second aspect of the invention.

FIG. 3 is a partial vertical sectional view showing an example of a conventional rotating electric machine.

FIG. 4 is a perspective view showing an example of a field coil incorporated in a conventional rotating electric machine.

FIG. 5 is a diagram showing an operation of a field coil incorporated in a conventional rotating electric machine.

6 is a perspective view showing an example of a field coil different from that of FIG. 4 of the field coil incorporated in the conventional rotating electric machine.

FIG. 7 is a partial vertical sectional view showing an example of a conventional rotating electric machine, which is different from FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic pole core, 1a ... Magnetic pole barrel, 1b ... Magnetic pole head, 2 ... Coil, 3 ... Ground insulating sheet, 4 ... Gap, 5 ... Insulating laminated plate, 6 ... Interlayer insulating plate, 9 ... Glass mat, 11 ... Epoxy Resin, 12 ... Insulation plate.

Claims (2)

[Claims] 1. A glass mat which is deformed by heating is inserted into a gap between a coil inserted in a pole barrel and the pole barrel, and an epoxy resin is injected between the coil and the pole barrel. A method of fixing a field coil characterized by being heated, cured and dried. 2. A glass mat which is inserted between a pole barrel and a coil inserted around the outer circumference of the pole barrel and deforms by heating, and a glass mat filled between the pole barrel and the coil for heating.
A rotating electric machine equipped with a cured and dried epoxy resin layer.