JPS59162750A - Insulating method of fully impregnated-coil of rotary electric machine - Google Patents

Abstract

PURPOSE:To preferably insulate in a short time by forming only an insulating layer of the part to be inserted into a slot of a core of a coil with a mica tape or sheet, immersing insulating varnish with the entire stator, and then forming an insulating coating layer on the projection. CONSTITUTION:Only an insulating layer 6 to be inserted into a slot of a core 7 of a hexagonal coil 5 is formed by winding a mica tape or sheet. A coil end 2 is not insulated, but inserted into the slot of the core 7. After the coils 5 are coupled therebetween, a spacer 9, a brace ring 10 are mounted. Then, the entire stator is dipped in the varnish, the varnish is cured, and then, an insulating coating layer 13 of thermosetting resin is formed simultaneously on the projection from the core 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for insulating a fully impregnated coil of a rotating electric machine.

In general, the method for insulating all impregnated coils of rotating electric machines is to wrap the entire circumference of the coil in a hexagonal shape with insulating tape, insert it into the slot of the iron core, connect the leads, etc., and then insulate the connected part. Wind the tape. Thereafter, a widely used method is to impregnate the entire structure with insulating varnish under vacuum pressure in an impregnation tank, and heat and harden it in a drying oven to form an insulating layer.

This fully impregnated coil insulation method consists of a slot part (1), a coil end m (2), and a nose part (
3) and a coil (5) consisting of a lead part (4).
When used alone, slot part (1)・Carp/l/, l
Mica tape is wrapped around all of the lead part (2), nose part (3), and lead part (4) to form an insulating layer (6) made of mica tape insulation.

After that, as shown in Figure 2, the coil (5) is inserted into the groove of the iron core (7), the lead part (4) and the phase ring (8) are connected, and then this connection part is insulated with mica tape insulation.
rl (6), drive a spacer (9) between the coil end parts (2) to support the coil end part (2), and place a place ring (10) around the outer periphery of the tip of the coil end part (2). Perform the installation.

Next, the entire body is loaded into an impregnating tank and impregnated with insulating varnish under vacuum pressure, and then heated and cured in a drying oven to form an insulating layer (6).
It forms the

However, in the above-mentioned conventional method, the mica tape winding method does not cover the slot portion (
1) and a part of the coil end part (2), it is possible to work with a cutting machine such as a taping machine, but
The mica tape wrapping of the lead part (3), the lead part (bleeding), the lead part (4) after the coil (5) is inserted into the iron core (7), and the phase resig (8) connection part is Because of the complexity, it is necessary to rely on manual labor, and the work requires a long time. Also, the mica tape wrapping has poor workability, so the insulating layer (6) must be sufficiently dense even after the insulating varnish impregnation and hardening treatment. This was difficult to achieve, and almost all of the weak points in insulation were concentrated in this area, which was considered to be a major difficulty in insulation processing.

This invention was made in view of the above points, and is formed by wrapping only the insulating layer inserted into the groove of the iron core ('7) of the hexagonal shaped coil (5) with mica tape or mica sheet. The coil end portion (2) is inserted into the groove of the iron core ('r) without any insulation, and after connecting each coil (5) ff5, the spacer (9) and place ring (10) are attached, and then the insulation To provide a fully impregnated coil insulating method for a rotating electric machine, in which a stator cup is completely impregnated with varnish, and after heating and hardening, an insulating coating layer of a thermosetting resin is formed all at once on a protruding part from an iron core (7). The purpose is to

The thermosetting resin insulation coating layer can be formed by powder coating, electrophoresis,
There is a dipping method using a chicken tropic resin, and as an example of this invention, powder coating will be explained with reference to the drawings.

First, when the coil (5) is used as a single unit, as shown in Fig. 3, an insulating layer (6
), and without applying any insulation to the nose part (3) or lead part (4), the fill (5) is attached to the iron core (
7) Insert into the groove.

After that, lead part (small wire connection and lead part (4)
and the phase ring (8). Phase ring (8
) parts with spacers (
11) and wrap that part with binding material such as insulating tape (
12) Secure with bondage.

Next, hold the coil end part (2) and attach the spacer (9).
) and place ring (1o).

This spacer (9) is made of a material with excellent electrical and mechanical properties, such as an epoxy glass laminate or a felt-like insulating material impregnated with epoxy resin, between the coil end portions (2). The place ring [10] is made of a material with excellent electrical and mechanical properties, such as a prepreg glass roving material, and is coiled around the outer periphery of the tip of the coil end part (2). /I/ (5) and wrap it an appropriate number of times.

Thereafter, the entire stator is impregnated with insulating varnish in an impregnation tank under vacuum pressure, and then heated and cured in a drying oven.

After completing the above work, in order to perform the powder coating well, preheat the entire stator, place the stator upright in a sufficiently heated state, and place the coil end part (2) with the insulating layer (6) as appropriate. The coil end part (2), nose part (3), lead part (4), and phase ring part (8) are all coated with powder such as epoxy resin or polyester resin. Insulation is performed all at once to form an insulating layer (13).

Note that if the powder coating operation is carried out immediately after the heating and curing of the full impregnation insulation operation, the above-mentioned preheating operation can be omitted.

FIG. 5 shows a comparison of coil insulation processing time between the conventional method and the method of the present invention. In other words, the conventional method involves insulating the coil slot (14), insulating the coil end (15), inserting and connecting the coil into the core (16),
The work is roughly divided into connection part insulation work (17), and the time allocation for each work is 15%, 30%, 30%, and 25%, respectively. However, according to the method of this invention, slot part insulation work (14) ,
Coil insertion and connection work into the iron core (16), powder insulation work (
18), and the insulation process can be completed in 50% of the work time of the conventional method.

FIG. 6 shows the AC short-time dielectric breakdown voltage values of coils insulated by the conventional method and the method of the present invention by the rapid rise method in a 5% Na0A solution. That is, as shown in FIG. 7, an insulated coil (5) is placed in a container (20) containing a 5% Na0t solution (19).
The average value of the AC short-time dielectric breakdown voltage of the coil (5) insulated by the conventional method when the AC voltage of the AC power supply (21) is rapidly increased is taken as 100%, and the vertical axis represents the dielectric breakdown. The voltage V ((6) is taken, and the horizontal axis shows the conventional method and the method B of the present invention.As is clear from FIG. 6, the method of the present invention The insulating layer (13) according to the property (23) of B is more
It can be seen that it exhibits excellent characteristics. This is the lead part (4)
This is also due to improved reliability of the insulating layer (13) at the connection portion of the phase ring (8). In Fig. 6, Ma is the average value of AC short-time dielectric breakdown voltage, ±3
σ indicates three times the variation between the upper and lower limits.

In addition, although powder coating was described in the above example, electrophoresis and immersion with thixotropic 1 m fat were used.
Coil end part (2), nose part (3), lead part (4
) It goes without saying that the same effect can be obtained by purchasing the insulating layer (13) between each other and at the connection portion between the lead portion (4) and the phase ring (8).

As described above, according to the present invention, it is possible to perform good insulation treatment in a short time.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional plan view showing a rotary electric machine fill that has been insulated using a conventional method, and Fig. 2 is a local cross-sectional view showing the vicinity of the coil end of a rotating electric machine coil that has been insulated using a conventional method, with the iron core inserted. , FIG. 3 is a partially sectional plan view showing a rotary electric machine coil subjected to insulation treatment by the method of the present invention;
The figure is a local cross-sectional view showing the vicinity of the coil end of a rotating electric machine coil insulated using the method of the present invention, with the iron core inserted;
FIG. 5 is a comparison diagram of the insulation processing time ratio between the conventional method and the method of the present invention, FIG. 6 is a comparison diagram of dielectric breakdown voltage in 5% NaC4 solution between the conventional method and the method of the present invention, and FIG. The figure is an electrical wiring diagram showing the dielectric breakdown test state. In the figure, (1) is the slot part, (2) is the coil end part, (3) is the nose part, (4) is the lead part, (5) is the coil, (6) is the insulating layer, and (7) is the iron core. , (8) is a phase ring, (9) is a spacer, (10) is a place ring, (11) is a spacer, (12) is a binding material, (13)
is an insulating layer. Note that the same reference numerals in each figure indicate the same parts.

Claims (1)

[Scope of Claims] 1. A first step of winding a part of the slot portion and coil end portion of the turtle'F-shaped coil with mica tape or mica sheet; a second step of inserting the slot portion into the groove of the stator core, connecting each of the hexagonal shaped fills, and holding the coil end portion with a spacer and a place ring;
A third step of impregnating the entire stator with insulating varnish under vacuum pressure and then heating and curing it, and a fourth step of forming an insulating layer of thermosetting resin on the protruding portion from the stator core. A fully impregnated coil insulation method for rotating electric machines. 2. The fully impregnated coil insulation method for a rotating electric machine according to claim 1, wherein the 2° insulation layer is formed by powder coating. 3. The fully impregnated coil insulation method for a rotating electrical machine according to claim 1, wherein the insulating layer is formed by electrophoretic coating. 4. The fully impregnated coil insulation method for a rotating electric machine according to claim 1, wherein the insulating layer is formed by dip coating with a chicken-tropic resin.