JPS6268032A - Stator of rotary electric machine - Google Patents

Abstract

PURPOSE:To eliminate the clearance adjusting work between the stator coil and the core slot by forming the low corona shield layer provided on the outer layer of the stator coil of the elastic half-conductive material. CONSTITUTION:Inside the core slot of a stator core 1, a stator coil 4 is inserted which has a bottom coil 4a and the upper coil 4b. For this stator coil 4 an earth insulation layer 10 is provided where the coil conductor is wound with the mica tape and glass tape. On the surface of the earth insulation layer 10 is wound a corona shield tape (half-conductive material) 11a o of porous feltlike elasticity impregnated with carbon into the tetron nonwoven fabric. Thus, as the low resistance corona shield layer 11a comes into contact with the core slot 3 with no clearance, the clearance adjusting work is no more required.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a stator for a rotating electric machine.

[Background of the invention]

4 and 5 show conventional examples of a stator for an electric motor. As shown in the figure, a stator core 1 made of stacked thin silicon steel plates has end plates 2 at both ends.
are provided and tightened with bolts. This stator core 1 is provided with a core slot 3, and a stator coil 4 including a bottom coil 4a and an upper coil 4b is provided in this portion.
is inserted. A support ring 5 is attached to the end of the stator coil 4 to prevent movement due to electromagnetic vibration, and is tied to a coil support 6 attached to the end plate 2 with glass thread or the like. Recently, the stator constructed as described above is manufactured by integrally impregnating the stator coil 4 and the stator core 1 with resin in order to improve reliability. Manufacturing by so-called integrated injection is increasing. In the figure, 7 is an adjustment liner, 8 is an intermediate layer liner, and 9 is a bottom liner.

That is, a ground insulating layer 10 is applied by winding a mica tape or a glass tape around the coil conductor, and a low resistance corona shield layer 11 for corona prevention is wound on the surface thereof. As the material for this low-resistance corona shield layer 11, materials close to rigid bodies have conventionally been used, such as a glass jacket impregnated with carbon resin, or paper or heat-resistant polyamide paper coated with a low-resistance face. Ta.

The stator coil 4 thus formed is inserted into the core slot 3 on the inner diameter side of the stator core 1, and is inserted into the coil support 6 provided on the end plate l-2 that tightens the stator core 1. The string is tied through the support ring 5. Since the stator coil 4 is subjected to electromagnetic force and thermal expansion and contraction force at the time of starting and operating the motor, it is necessary to securely fix it within the core slot 3. Therefore, a slot liner 12 is inserted to adjust the gap between the stator coil 4 and the core slot 3, and if the gap is large, the slot liner 12 is inserted between the stator coil 4 and the core slot 3.
You can put 3 pieces from. Alternatively, as shown in FIG. 6, a felt-like insulating material 14 made of polyester non-woven fabric or the like is bonded with adhesive and driven into one side of a hard insulating spacer 13 such as a thin epoxy glass laminate. was. After adjusting the gap between the stator coil 4 and the core slot 3 in this way, a wedge 15 is driven into the core slot 3 as a presser, and the stator coil 4 and stator core 1 are placed in a vacuum tank with the integrated state. The impregnating resin is injected at a vacuum level of about 1 mmHg or less, and all of the stator coil 4° and stator core 1 are impregnated with the resin.

After impregnation, the stator coil 4. is removed from the vacuum tank. Stator core 1
Take out the integrated stator and put it in a drying oven at a temperature of 1
The impregnated resin is cured at 50°C for about 5 hours.

When the stator is manufactured by integral injection in this way, if there is a large gap between the stator coil 4 and the core slot 3 when there are four stator coils, the impregnated resin will flow out during drying and cause damage to the stator coil 4 and the stator. A large gap occurs between the core 1 and
This results in reduced adhesion and corona discharge during operation in voids, which damages the insulating layer. Therefore, adjusting the gap between the stator coil 4 and the stator core 1 is very important.

By the way, adjusting the thickness of the slot liner 12 when inserting the stator coil 4 into the stator core 1 described above takes a lot of man-hours, and the gap between the stator coil 4 and the stator core 1 is larger than the length of the stator core 1. When considered in the horizontal direction, it is not uniform, and there is a drawback that sufficient adjustment cannot be made by adjusting the number of slot liners 12. In addition, in the adjustment using a composite material of the insulating spacer 13 and the felt-like insulating material 14, the gap between the stator coil 4 and the stator core 1 is generally 0.5+
Since the thickness of the composite material of the insulating spacer 13 and the felt-like insulating material 14 is approximately 0.5 to 1 mm, it is difficult to make the composite material thick enough to have sufficient rigidity for driving. Thickness from 2mm to 3
There was a drawback that the width of the core slot 3 had to be made large. Regarding this, JP-A-60-35933, JP-A-60-28753
There are publications, etc.

[Purpose of the invention]

The present invention has been made in view of the above points, and provides fixation of a rotating electrical machine that makes it possible to eliminate the need for gap adjustment between a stator coil and a core slot when the stator coil is assembled into the core slot. The purpose is to provide children.

[Summary of the invention]

That is, the present invention provides a stator for a rotating electrical machine, in which a stator coil inserted into a core slot of a stator core and having a low-resistance corona shield layer provided on the outer layer is integrally impregnated with the stator core and resin. The low-resistance corona shield layer is made of a semi-conductive and elastic semi-conductive material, thereby incorporating the stator coil into the core slot. In some cases, a low resistance corona shield layer can be incorporated in good contact with the core slot.

[Embodiments of the Invention] The present invention will be described below based on illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-3.

Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this example, the low resistance corona shield layer 1.1
a is a semiconductive material 1 that is semiconductive and has elasticity;
．． 1ao.

By doing this, the low resistance corona shield layer 11
a is a semiconductive material 11 that is semiconductive and has elasticity;
When the stator coil 4 is assembled into the core slot 3, the low resistance corona shield layer 11a is
It is now possible to incorporate the stator coil 4 into the core slot 3 so that it makes good contact with the core slot 3.
Thus, it is possible to obtain a stator for a rotating electrical machine that makes it possible to eliminate the need for gap adjustment work between the stator coil 4 and the core slot 3 when the stator is assembled into a motor.

In other words, it is a porous felt-like low-resistance corona shield tape made by impregnating Tetron non-woven fabric with carbon (
A semi-conductive material) llao (see Figure 2) is wound around the surface of the ground insulating layer 10 using the stator coil 4 alone, and the width is made approximately 1 mm larger than the width of the core slot 3 to form a low resistance corona shield layer 11a. (see Figure 3), and insert it into the core slot 3 in this state. By doing this, the low resistance corona shield yf411-a is compressed and inserted into the core slot 3, and comes into contact with the core slot 3 without any gaps. Therefore, the stator coil 4 itself functions as a composite insulation spacer and slot liner, eliminating the need for these and eliminating the need to adjust the gap between the stator coil 4 and the core slot 3. can do.

〔Effect of the invention〕

As described above, the present invention eliminates the need to adjust the gap between the stator coil and the core slot when the stator coil is assembled into the core slots 1 to 1, and the stator coil when the stator coil is assembled into the core slot. It is possible to obtain a stator for a rotating electrical machine that makes it possible to eliminate the need for gap adjustment work between the core slot and the core slot.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional side view of an embodiment of a stator for a rotating electric machine according to the present invention, FIG. 2 is a perspective view of a low-resistance corona shield tape of an embodiment, and FIG. 3 is a stator of an embodiment of the same. 4 is a side view of a stator of a conventional rotating electric machine; FIG. 5 is a side view of a stator of a conventional rotating electric machine;
FIG. 6 is a longitudinal sectional side view of another example of a conventional stator for a rotating electric machine. 1... Stator core, 3... Core slot, 4...
Stator coil, 4a...bottom coil, 4b...top coil, 10...earth insulating layer, 1.1. a...Low resistance corona shield layer, 11. ao...Low resistance corona shield tape (Hanman 1 diagram)

Claims (1)

[Claims] 1. A rotating device in which a stator coil, which is inserted into a core slot of a stator core and whose outer layer is provided with a low-resistance corona shield layer, is integrally impregnated with the stator core and resin. In a stator of an electric machine, the low resistance corona shield layer is
A stator for a rotating electric machine, characterized in that it is made of a semiconductive material that is semiconductive and has elasticity. 2. The stator for a rotating electric machine according to claim 1, wherein the semiconductive material is formed by impregnating Tetron nonwoven fabric with carbon.