JPH05284682A - Armature winding of electric rotating machine - Google Patents

Abstract

PURPOSE:To eliminate fluctuation in resistance value in low resistance layers and to prevent a electric rotating machine from deterioration even if there are damages, etc. CONSTITUTION:At least two low resistance layers 11 and 12 are formed on the peripheral surface of a main insulating layer 5, so that fluctuation in resistance value scarcely cause, and even if there are damages, etc., in the low resistance layer 12 on the peripheral surface side, the damages scarcely reach the low resistance layer 11 on the inside, resistance value as the low resistance layers 11 and 12 is so controlled that it prevents an electric rotating machine from deterioration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature winding of a rotary electric machine having a rated voltage higher than a high voltage.

[0002]

2. Description of the Related Art FIG. 2 is a view showing an insertion state of an armature winding in an armature slot. A plurality of slots 2 are formed in the iron core 1 of the armature, and each armature winding 3 is formed in these slots 2.
Has been inserted. In the armature winding 3, as shown in the sectional view of FIG. 3, a main insulating layer 5 is provided around the wire 4, and a low resistance layer 6 is formed around the main insulating layer 5. The formation of the low resistance layer 6 prevents the occurrence of discharge between the surface of the main insulating layer 5 and the slot 2.

The low resistance layer 6 is formed as follows. One of the methods is to apply a low resistance paint to the outer periphery of the main insulating layer 5, then butt-wrap a glass tape, and then apply a low resistance paint so that the solvent content contained in the low resistance paint is exhibited. To form a low resistance layer.

In another method, a low resistance paint is applied to the outer periphery of the main insulating layer 5, and then the solvent contained in the low resistance paint is exerted to form a low resistance layer, or a low resistance layer is formed. A low resistance layer is formed by using a synthetic resin in a layer paint and curing the synthetic resin.

However, the surface resistance value of the low resistance layer 6 formed by the above method tends to vary. Also, when inserting the armature winding 3 into the slot 2, or when inserting a spacer between the armature winding 3 and the slot 2 for inserting and fixing the armature winding 3 into the slot 2. The low resistance layer 6 may be scraped or damaged.
This may cause variations in the surface resistance value of the low resistance layer 6.

[0006] In this way, if there is a variation in the resistance value due to the application of the low-resistance paint, or a variation in the resistance value due to damage or the like,
In a high-voltage rotating electric machine, a small discharge is generated between the low resistance layer 6 and the slot 2 where the surface resistance of the low resistance layer 6 is large, particularly in the damaged portion, and the discharge energy causes the low resistance layer 6 to generate heat.

In addition, since the armature winding 3 slightly vibrates in the slot 2 during operation of the rotating electric machine, the minute vibrations are combined to deteriorate the low resistance layer 6. Due to this deterioration, the low resistance layer 6
Has a locally large resistance value.

By repeating the discharge and the minute vibrations in this way, the deterioration progresses, the discharge in the slot 2 expands, the main insulating layer 5 deteriorates, ozone is generated by the discharge, the iron core of the rotating electric machine and other parts. Corrosion is induced. As a result, the function of the rotary electric machine deteriorates.

[0009]

As described above, the resistance value of the low resistance layer 6 varies, and when the armature winding 3 is inserted or fixed in the slot 2, the armature winding 3 is damaged. Etc., the surface resistance value of the low resistance layer 6 varies, and the function of the rotating electric machine deteriorates.

Therefore, the present invention provides an armature winding for a rotating electric machine, which eliminates the variation of the resistance value in the low resistance layer and can suppress the resistance value so that the rotating electric machine does not deteriorate even if it is damaged. The purpose is to

[0011]

According to the present invention, in an armature winding of a rotating electric machine inserted into a slot formed in an armature of the rotating electric machine, a wire and a main wire provided around the wire are provided. An armature winding of a rotary electric machine, which is intended to achieve the above object by forming an armature winding with an insulating layer and at least two low resistance layers formed on the outer periphery of the main insulating layer.

[0012]

Since the low resistance layer is formed of at least two layers by providing such means, the resistance value rarely varies, and the low resistance layer on the outer peripheral side is not damaged. However, the inner low resistance layer is rarely damaged, and the resistance value of the low resistance layer is suppressed to a resistance value that does not cause deterioration.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a sectional view of the armature winding of a rotary electric machine. On the outer periphery of the main insulating layer 5 of the armature winding 10,
The first low resistance layer 11 is formed, and the second low resistance layer 12 is formed on the outer periphery of the low resistance layer 11. The first low resistance layer 11 has a resistance value of 5000Ω or less,
The resistance value of the low resistance layer 12 is 3000 Ω or less.

Next, a method of forming the low resistance layers 11 and 12 will be described.

(1) First, a low resistance paint containing resin of synthetic resin type (trade name: TVH6501 manufactured by Toshiba Chemical Co., Ltd.) is applied on the surface of the main insulating layer 5 by brushing, and then this low resistance paint is applied. Glass tape on the surface (Product name: Arisawa thickness
0.1 mm) is butt wound and then the low resistance paint is applied again by brushing. It should be noted that the glass tape is changed from fly-wound with a minute gap of 2 mm or less to butt-wound, and is not lapped.

Then, the first low resistance layer 1 is naturally dried.
1 is formed. Then, the surface resistance of the first low resistance layer 11 is measured and it is confirmed that the resistance value is 5000 Ω or less.

(2) Next, the first low resistance layer 1 formed above
A low resistance paint (trade name: TVH6501 made by Toshiba Chemical Co., Ltd.) is applied to the surface of No. 1 by brush coating, and then a glass tape (trade name: 0.1 mm thickness made by Arisawa) is applied to the surface of this low resistance paint. It is butt-wound and then the low resistance paint is again applied by brushing. Then, it is naturally dried to form the second low resistance layer 12. Then, the surface resistance of the second low resistance layer 12 is measured, and the resistance value 300
It is confirmed to be 0Ω or less.

(3) Next, the low resistance layers 11 and 12 are placed in an atmosphere having a temperature of 60 ° C. or higher for 1 hour or more and dried. As a result, the resin component contained in the low resistance paint is heat-cured. It should be noted that the resistance value of each low resistance layer is reduced by this heat curing.

After that, the first and second low resistance layers 11, 1 are formed.
2 is cooled to room temperature. Here, these low resistance layers 1
The combined surface resistances as 1 and 12 are measured and confirmed to be in the resistance range of 20Ω to 2000Ω.

As a result, the first low resistance layer 11 and the second low resistance layer 12 are formed.

In the armature winding 10 having such a structure, since the first and second low resistance layers 11 and 12 are formed, it is possible to reduce variations in resistance value caused by uneven application of the low resistance paint. Further, since the low resistance layers 11 and 12 are hardened by heating to have high mechanical strength, they are not damaged even if some mechanical force is applied, and even if they are damaged, the second low resistance layers 11 and 12 are not damaged. It stops at the resistance layer 12 and does not reach the first low resistance layer 11. Therefore, even if damaged, the resistance value of the first low resistance layer 11 is maintained at 5000Ω.

In a rotary electric machine using such an armature winding, discharge is generated between the armature winding and the slot,
Moreover, even if the low resistance layers 11 and 12 are damaged due to microvibration during operation, the resistance value of the low resistance layers 11 and 12 is suppressed to a small value and the deterioration thereof is not accelerated. This allows
The rotating electric machine can be stably operated, and can be operated with high quality and long life.

Next, a second embodiment of the present invention will be described. Since the first and second low resistance layers 11 and 12 are formed in this embodiment as in the above embodiment, description will be made with reference to FIG.

(1) When the first low resistance layer 11 is formed, a low resistance paint (trade name: TVH6501 manufactured by Toshiba Chemical) is applied to the surface of the main insulating layer 5 and naturally dried. Then, it is confirmed that the resistance value is 5000Ω or less.

(2) After that, for forming the second low resistance layer 12, the same low resistance coating material is applied to the surface of the first low resistance layer 11 and naturally dried. And the resistance value is 3000
It is confirmed to be Ω or less.

(3) After that, the low resistance layers 11 and 12 are placed in an atmosphere having a temperature of 60 ° C. or higher for 1 hour or more, dried, and cured by heating.

Thus, the combined resistance value of the low resistance layers 11 and 12 is 20Ω to 2000Ω.

In this case, the application of the low-resistance paint is not limited to twice, but may be performed a plurality of times, and natural drying is repeated for each application.
A plurality of low resistance layers are formed and the resistance value is 20Ω to 200
It may be in the range of 0Ω.

With this method of forming the armature winding, the same effects as those of the first embodiment can be obtained, and it is not necessary to butt and wind the glass tape.

The present invention is not limited to the above embodiments, and may be modified within the scope of the invention. For example, a low resistance is obtained by using both the method of forming the low resistance layer by winding the glass tape of the first embodiment and the method of applying the low resistance coating by repeating the second embodiment a plurality of times. You may form a layer. Further, the material of the low resistance paint is not limited to those described in the examples, and other materials may be used.

[0032]

As described in detail above, according to the present invention, it is possible to eliminate the variation in the resistance value in the low resistance layer, and to suppress the resistance value so as not to cause the deterioration of the rotating electric machine even if it is damaged. An armature winding of an electric machine can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of an armature winding of a rotary electric machine according to the present invention.

FIG. 2 is a diagram showing an armature winding inserted in a slot of an armature.

FIG. 3 is a sectional view of a conventional armature winding.

[Explanation of symbols]

4 ... Elemental wire, 5 ... Main insulating layer, 10 ... Armature winding, 11 ... 1st low resistance layer, 12 ... 2nd low resistance layer.

Claims (1)

[Claims] 1. An armature winding of a rotating electric machine inserted into a slot formed in an armature of the rotating electric machine, comprising: a wire; a main insulating layer provided around the wire; and a main insulating layer. And at least two low resistance layers formed on the outer periphery of the armature winding of a rotating electric machine.