JPS6059949A - Coil insulating method of rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce the prescribed steps required for an insulation by forming the second insulatin layer made of thermosetting powder synthetic resin by fluid dipping painting on a coil end, and securing a coil by a brace ring which includes a feltlike material. CONSTITUTION:The second insulating layer 14 is formed in a thickness of 0.05- 5mm. of powder painting resin such as, for example, epoxy resin, polyester resin covered cover a lead portion 4 from part of coil end 2. A spacer 17 is inserted between phase rings 16, and an insulating tape 18 is wound. Further, a laminated board like a spacer 19 such as, for example, a mica plate or felts, mica sheets is inserted between the coil ends, a core material 21 made of metal or reinforced plastic is used as aggregate, a felt 22 like Dacron mat is disposed to form a brace ring 20 for supporting the coil.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a coil insulation treatment method for a rotating electrical machine, and more specifically, the present invention relates to a coil insulation treatment method for a rotating electrical machine, and more specifically, the invention relates to a coil insulation treatment method for a rotating electrical machine, and more specifically, the invention relates to a method for insulating a coil of a rotating electrical machine. This relates to a processing method.

[Prior art]

Figure 1 shows a conventional coil of this type that has been insulated.
In the figure, the coil is made up of a slot part l, a coil end part k, a nose part 3, and a lead part da, which are inserted into the nut of the stator core. Winded & as required
The coil was formed by heating and pressing, and all of the coils were taped and, if necessary, vacuum impregnated.

Conventionally, there have been methods for insulating such coils as shown below. That is, (1) a method in which a hexagonal-shaped coil is wrapped around the entire circumference with insulating tape, and the hexagonal-shaped coil is impregnated with an impregnating resin under vacuum pressure in an impregnating tank.

(4) A coil wound in a tortoiseshell shape is inserted into the slot of the iron core of a rotating electric machine, and the leads etc. are connected to it. After insulation treatment, the whole is vacuum impregnated with resin in an impregnating tank. The insulating layer is formed by heating and curing in a drying oven.This is the so-called total impregnation method.

(3) The so-called prepreg method, in which the entire circumference of the coil is wrapped in advance with insulating tape containing a large amount of resin, heated and pressure-molded to form an insulated coil, and then inserted into the slot of the iron core.

It is.

However, the insulation performance is almost the same in the insulation configurations according to methods (2) and (3); In addition, the method (,?) has the drawback of requiring equipment such as a hot press device.

In addition, since the shape of the coil of a high-voltage rotating machine is generally a tortoise-shell shape, methods (1), (λ), and (,?) above apply.

Special coil end part, coil end nose part, connection part 5
Much of the winding work for the coil end, which consists of the phase ring, etc., must be done manually, which requires a lot of man-hours, and since it is a multi-shaft, the taping work also takes a long time. Therefore, it has been desired to eliminate taping of the coil insulation section.

Furthermore, the insulation composition of the coil end after heat curing treatment is as follows:
It is difficult to make it sufficiently dense, and almost all weak points in insulation are concentrated in this area, which is considered to be a major difficulty in insulation processing.

[Summary of the invention]

This invention eliminates the drawbacks of the conventional coil insulation processing method as described above, reduces the number of work steps required for insulation processing, and improves the insulation of the coil end portion, which has many defects, regardless of its shape. It is an object of the present invention to provide a method for insulating the coils of a rotating electrical machine, which can provide good coil insulation regardless of the amount of heat or heat.

It is also an object of the present invention to incorporate a coil on which a first insulating layer made of mica insulating material is formed into an iron core, and to apply a first insulating layer made of thermosetting powder synthetic resin to the coil end portion of the connected coil by fluid dip coating. forming a core insulating layer 1-1 and
An object of the present invention is to provide a method for insulating a coil of a rotating electric machine, in which a coil is fixed with a place ring containing a felt-like material.

[Embodiments of the invention]

A coil constructed according to the present invention is shown in FIGS. 1, 3, and q of the accompanying drawings. In FIG. 1, the slot portion l,
The coil end part ko, the nose part 3, and the lead part q are the same as each part of the coil constructed by the conventional method, but the first insulating layer tt of the slot part 1 includes the slot insertion part of the coil and the iron core/ The first insulating layer is formed by winding a mica insulating material such as a mica tape or a mica sheet extending by a predetermined length L from the end 13 of the first insulating layer, and the predetermined length L is
The creepage distance in insulation design is set to a length according to the voltage class.
t or more, and 30 ym for A kV class plane rotating electric machines.
It is set to be the above. What is the thickness of the second edge supply layer made of powder coating resin that is coated from a part of the coil end part to the lead part?

θ0! ~6 types are effective, and the size of the gap between the coils and the appropriate thickness are selected depending on the voltage class. Also,
The connecting portion 13 with the first insulating layer is.

At least, the overlap shall be at least 10 m1 for J kV class plane rotating electric machines, and at least tm1 for A kV class plane rotating electric machines. This is to eliminate weak points at the interface. Furthermore, the distance between the phase rings 14 shown in FIG. ? For kV class surface rotating electric machines, 78 or more, A kV
Rotating electric machines have a grade of C or higher, which prevents corona deterioration. In addition, a spacer 17 is inserted between the phase rings 4, and a piece of insulation material such as a mica board, felt, gun laminate, mica tape, or mica sheet is inserted, and the coil is supported with a blue ring. .

The above embodiment t will be explained in more detail.

First, we started with a coil made of copper wire treated with heavy glass fiber.
x i tar ) is wound in rows to form a tortoiseshell-shaped coil, and a mica sheet layer is applied to the slot portion l extending from the end portion tj of the iron core 7.2 by a predetermined length L. The first insulating layer is formed by winding the first insulating layer. Then,
For example, 7.2 coils manufactured in this way are 1, for example, the number of slots is 7, 3, ? After inserting it into the slot of the stator (inner diameter 7:1fi) of the kV induction motor,
While connecting these coils, a phase ring t6 is also attached, and a place ring θ containing a felt-like material is attached to fix the coil ends.

The phase ring 16 is thus inserted into the slot and
Coils that are also installed inside place rings, etc.
, After pre-drying by heating to 0°C, for example, the coil end portion 2 and other parts where the first insulating layer is to be formed are immersed in a fluidized immersion bath of epoxy powder synthetic resin, and the coil end portion 2 is immersed. An epoxy resin coating film is formed on the parts and other parts where the λth insulating layer/G' is to be formed, and this step is repeated multiple times. As a result, the coating films formed had grades 1 to 1.

The powder coating used here is epoxy resin l
Although ester resin, ester imide resin, etc. are used, epoxy resin is particularly suitable because it is easy to handle and has good performance. Once the epoxy resin film is formed as described above, the coil Y / Place in an oven at 4θ°C and heat for about 1 hour to harden the resin film and form the second insulating layer /4. However, the connecting portion 7.1
teeth.

As described above, the first insulating layer // overlaps the second insulating layer tq to strengthen the interface.

Next, the place ring: IO has a core material made of metal or reinforced plastic, 2/ is an aggregate, and a felt coat λ such as Dacron mat is placed around it, so it has poor heat conduction and is made of powder. Paint does not stick. Needless to say, this felt 22 has continuous holes.

FIG. 3 shows another embodiment, in which 3 is a metal ring.

When the core material Cotilt made of a metal material is used for the place ring 0 in the above embodiment, the Felt Coil 2 is attached after an insulating layer of a certain thickness made of a mica insulating material is applied to the surface of the metal material. This means that the insulation between the core material 2/) and the coil end portion 2 is maintained by the mica insulation layer.
The mica insulating layer has an appropriate thickness depending on the voltage class. For example, in the case of l, ni'/ class, this thickness is greater than or equal to t.
In JkV class! Requires Iris II or higher.

In addition, in order to fix the coil end part 2 and to improve the formability of the coating film on the coil end part 2, after wrapping +B stage glass preg material around the outer periphery of the coil end part 2, It is desirable to install a place ring containing material.

As mentioned above, the first step. The coil in which the second insulating layers //, /g are formed and no coating film is formed on the place ring θ is completely impregnated with epoxy resin and subjected to predetermined rotational curing.

The coil and place ring thus obtained are completely impregnated with the impregnating resin.

〔Effect of the invention〕

As described above, in this invention, since the inside of the coil and place ring are completely filled with impregnated resin, a stator equipped with such a coil is tested by a withstand voltage test in which an AC voltage θ kV is applied for 1 minute in water. As a result, no abnormality was observed.5Furthermore, no abnormality was observed even when an AC voltage of 10 kY was applied underwater for 100 hours, and good test results were obtained.

[Brief explanation of drawings]

FIG. 3 and 4 are cross-sectional views thereof, and FIG. 5 is a vertical cross-sectional view of another structure corresponding to FIG. 3. L...Coil slot part, Co...Coil end part, 3
...Nose part, S...Lead part, //...Tpth edge layer,
1.2...iron core, t3...end, lg...sp edge layer-
tS...Connection part, /4...Phase ring, 17...Spacer, IT...Insulating tape, /9...Spacer piece, :lO...
・Blue ring 1.2/・Core material, here: felt, here: metal ring. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (1)

[Claims] (1) The slot portion and the coil end portion of a tortoise-shell shaped coil are provided with a slot portion inserted into a slot of an iron core, a coil end portion that is continuous with the slot portion, and a place ring that fixes the coil end portion. A part of the coil is wrapped with mica insulation to form a first insulating layer, and then the slot portion is inserted into the slot and wired. In the method for insulating a coil of a rotating electrical machine, the place ring includes a felt material. A coil insulation treatment method for a rotating electrical machine, characterized by: (A) A coil insulation treatment method for a rotating electric machine according to claim 1, in which the place ring has a core material selected from a metallic material and a reinforced plastic. A method for insulating a coil of a rotating electric machine according to claim 1, which is made of a metallic material having a layer formed on its surface. A coil insulation treatment method for a rotating electric machine according to claim 1.