JPS59106863A - Manufacture of rotary electric machine - Google Patents

Abstract

PURPOSE:To enhance the insulating reliability by facilitating the exfoliation of a protecting insulating layer for covering a non resin-impregnated ground insulating layer outside a coil conductor, thereby suppressing the thermal stress to be at an insulated coil to a low value. CONSTITUTION:An aromatic polyimide film is wound on the outer periphery of a coil conductor 1 to form a ground insulating layer 2. Further, aromatic polyamide paper and aromatic polyamide non-woven fabric are heat-press-bonded with silicone resin as a binder under the pressure of 5kg/cm<2> in an insulating tape, which is wound on the outer periphery to form a protecting insulating layer 3, and a non-resin-impregnated insulated coil 4 is manufactured. Two layers of the coil 4 are formed, the aromatic polyamide paper is enclosed as a slot liner 5, contained in the slot 7 of a core 6, a wedge 8 is hitted to the hole of the slot 7, heat resistant epoxy resin is fully impregnated, and thermoset.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for manufacturing a rotating electrical machine that reduces stress due to thermal elongation of an insulated wire ring that is fully impregnated with resin together with an iron core, and improves insulation reliability. .

[Technical placement of the invention and its problems]

The manufacturing methods for insulated wire rings for rotating electric machines can be roughly divided into the resin-rich method and the vacuum pressure impregnation method.In recent years, the vacuum pressure impregnation method has become mainstream from an economical and quality standpoint. , Motive's...: Since the rotor windings of rotor windings and roll-type conductive motors are rotating bodies, a non-resin-impregnated insulated wire ring is placed in the slot of the iron core, and then the resin is vacuumed together with the iron core. The so-called total impregnation method, which involves pressure impregnation, is preferred because it prevents vibration of the coil. Furthermore, this total impregnation method improves the cooling effect and insulation performance, so its application has been expanded from small to medium-sized machines to large-sized machines. However, even in large machines, if the core length is long, the insulated wire ring and core may contain N4
Because they are strongly integrated with i1 resin, when the operating temperature rises, the thermal difference between the insulated wire ring and the iron core causes large mechanical stress to be applied to the insulating layer, causing a rapid decrease in dielectric strength. I found out that I can.

For this reason, conventional attempts have been made to interpose a release material such as Teflon between the slot liner that wraps the insulated wire ring and the iron core, but the material is expensive and because it is a thin film, it has poor mechanical strength. In addition,
The impregnated working fat locally adheres to the voids on both sides of the Teflon.
It has been found that this method may damage the insulating layer, so it has not been put to practical use.

Another attempt was made to apply a mold release agent between the slot liner and the iron core to provide mold release properties, but the mold release agent dissolved in the impregnated resin and the mold release effect was lost. , this also has not been put into practical use.

[Purpose of the invention]

The present invention provides a method for easily manufacturing a rotating electrical machine with high insulation reliability by suppressing thermal stress generated in an insulated wire ring while applying the total impregnation method to a rotating machine with a long core length. The purpose is to

[Overview of the invention]

In the present invention, an unimpregnated ground insulating layer is provided on the wire conductor, a protective insulating layer is provided on the outside of this ground insulating layer to form an unimpregnated insulated wire ring, and this is wrapped in a slot liner and rotated. A method for manufacturing a rotary machine in which a can placed in a slot of an electrical iron core is impregnated with resin (&J 1ltt) together with the iron core, and is taken out from the resin and subjected to impregnation treatment. In the above, the protective insulating layer is formed by winding the insulating tape f, which is manufactured by pasting two heat-resistant fiber base ladle with silicone resin as a binder, on the outside of the ground insulating layer. When the iron core and the iron core undergo hot elongation due to an increase in temperature IW, the silicone level (
Peeling is caused between two heat-resistant memory fiber base materials bonded using fat as a binder, and the difference in heat elongation is released in this area to prevent damage to the ground insulating layer.

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to FIG. Aromatic polyamide paper is placed around the outer circumference of the wire conductor (1).
The ground insulating layer (2) is completely formed by winding ilm (Kapton and 105 DuPont's product names), and aromatic polyamide paper (A tissue, product name of Japan Aroma Company) is wrapped around the outer periphery. ) and aromatic polyamide nonwoven fabric (K
H3003CT manufactured by Nippon Vilene Co., Ltd.) was used as a binder, and a silicone resin (YR-3340 manufactured by Toshiba Silicone Co., Ltd. was used) was used as a binder and heat-pressed at a pressure of 5 kV'ctA. A protective insulating layer (3) is formed by winding the insulating tape, and a 3 m long non-resin-impregnated insulating coil (4) is manufactured. This non-resin-impregnated insulating wire (4) was made into two layers, and aromatic boria oxide paper (made by DuPont Co., Ltd. under the name Nomex) was wrapped as a slot liner (5) to form a 2 m long Iron core (6
) into the slot (7), and insert the wedge (
8) was driven over the entire length of the core, completely impregnated with heat-resistant epoxy resin, and cured by heating. Make 6 of these and sample A
I will call it .

Next, for comparison, as a conventional method, the protective insulating layer (3) of sample A was replaced with a protective insulating layer wrapped with glass tape, and the other things were the same as sample A. Sample Bf: 6 pieces were manufactured. did.

Next, the effect will be explained.

In order to compare the effects of sample A according to this example and sample B according to the conventional example, two samples were selected from each sample and subjected to a heat cycle test in which a lower limit of 50 degrees Celsius and an upper limit of 180 degrees Celsius were repeatedly applied by energization for 3000 degrees. Conducted twice. After the heat cycle test was completed, we observed the insulating layer at the part of the core end that had come off the slot liner (5), and found that there was no change in the state of sample A compared to sample #aM. In B, many small racks were observed. Furthermore, the remaining four samples A and H were combined into two sets, one before the heat cycle test, one after the heat cycle test 1,500 times, and the heat cycle test after the heat cycle test 3,000 times. When the breakdown voltage was determined for the two samples, a clear difference was found as shown in FIG.

Curve A in Figure 2 shows the case of sample A, and curve B shows the case of sample B.
The horizontal axis shows the number of heat cycles, and the vertical axis shows the relative breakdown M voltage, where the breakdown voltage when sample B is not subjected to the heat cycle test is set to 100, and the other values are shown as relative values. As shown in Fig. 2, Sample A according to the non-conventional example has almost no relation to the heat cycle and maintains a value about 25% better than the initial value of Sample B according to the conventional example, whereas the conventional example It can be seen that Sample B is in a terrible state, with its breakdown voltage reduced by half due to heat cycling.

It was also found that insulation breakdown H was concentrated at the center of the core in sample A, and at the end of the core in sample B*.

After completing the above test, the Hou (8) was crushed and removed with a chisel, and then a tapered chisel was fully driven into the end of the core (1).
The stiffening force between the insulated wire ring and the iron core was investigated. In sample A, the insulated wire could be easily disassembled from the iron core. The decomposition part was due to peeling of the silicone resin adhesive part of the protective insulation layer (3). On the other hand, sample B had a strong rigidity, and when the glasses were driven in, cracks occurred in the ground insulating layer and the grade insulating layer, and as the decomposition progressed further, this progressed to peeling within the wire conductor.

Considering the following, when the core length is long and the difference in heat difference between the core and the insulated wire ring is going to be large, the conventional type with a strong solid layer between the core and the locomotive ring is not suitable for the purpose. Since L6 is the weakest insulating layer, cracks occur in that insulating layer. On the other hand, the unsatisfactory example has excellent heat cycle resistance characteristics, as shown in curve fHh in Figure 2, by creating a weak point in the storage insulating layer that does not contribute much to the dielectric strength. Rotating electric machines can be easily manufactured.

Since the stress relaxation part is located at a lower level than the slot liner (5), the shielding force of the slot liner (5), wedge (8), and iron core (6) can be maintained strong, and the insulated wire ring Shooting can be kept low.

It should be noted that the present invention is not limited to the embodiments shown above and shown in the drawings; for example, the impregnating resin may be other than epoxy resin, 3
) f: The insulating tape to be formed may be made by pasting a combination of two heat-resistant fiber base materials other than the combination of aromatic polyamide paper and aromatic polyamide nonwoven fabric, as long as the gist is not changed. , of course, can be implemented with individual modifications.

[The fruits of invention]

As explained above, according to the present invention, by making the protective insulating layer easy to peel off, even if a large rotating electric machine with a long iron core containing insulated wire rings is manufactured by the full impregnation method, the heat cycle resistance is maintained. It is possible to easily manufacture a rotating electric machine with excellent insulation reliability.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the vicinity of the slot portion of a rotating electrical machine that is being manufactured using an embodiment of the method of the present invention, and Fig. 2 shows a rotating electrical machine produced using an embodiment of the method of the present invention and a rotating electrical machine produced using a conventional method. FIG. 2 is a curve diagram showing a comparison of dielectric breakdown voltage characteristics with respect to heat cycles of rotating electrical machines. 1... Wire conductor 2... Resin-unimpregnated ground insulation layer 3
...Protective insulating layer 4...Resin-unimpregnated insulating wire 5...
・Slot liner 6... Tetsushin 7... Slot agent Patent attorney Inoue - Male

Claims (2)

[Claims] (1) A non-resin-impregnated ground insulating layer is provided on the wire ring black body, a protective insulating layer is provided on the outside of this ground insulating layer to form a non-resin-impregnated insulated wire ring, and this is wrapped with a slot liner to form a rotating electric machine core. After placing it in the slot of the rotary electric machine, it is placed in resin together with the iron core and impregnated with resin, and then taken out from the resin and subjected to hardening treatment of the impregnated resin! ! ! ! ! In the manufacturing method, the protective insulating layer is formed by wrapping an insulating tape produced by pasting two heat-resistant fiber base materials using silicone resin as a binder around the outside of the ground insulating layer. Manufacturing method of rotating military aircraft. (2) The method for manufacturing a rotating electric machine according to the scope of Patent M, item 1, wherein the two heat-resistant fiber substrates are aromatic polyamide paper and aromatic polyamide nonwoven fabric.