JPH0640728B2 - Armature of rotating electric machine and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an armature for a rotary electric machine, and more particularly to an armature for a rotary electric machine having slot insulation of a varnish having good insulation and adhesiveness.

[Conventional technology]

An armature of a rotary electric machine has a rotor core having a plurality of slots formed therein, and a coil is wound around each slot of the rotor core. The coil wound in this slot needs to be insulated from the inner surface of the slot by slot insulation, and conventionally, various measures have been taken for that purpose. For example, in the conventional example described in Japanese Utility Model Laid-Open No. 61-41346, as shown in FIG.
Insulating paper 3 was laid on the inner surface of coil 1, coil 4 was embedded, and after winding was completed, varnish 5 was impregnated and hardened. In another conventional example, as shown in FIG. 7, the powder resin layer 6 is formed on the inner surface of the slot 2, the coil 4 is embedded and the winding is completed, and then the varnish 5 is impregnated and cured, or the same kind of material is used. The powder resin was attached. Further, in JP-A-59-110355,
Liquid resin was coated on the inner surface of the slot, and insulating paper was attached to the edge portion of the core end surface outlet of the slot.

[Problems to be Solved by the Invention]

In the conventional example shown in FIG. 6, as shown in FIG.
When the winding work is performed, since the insulating paper 3 is laid, the possibility that the coating film of the coil is peeled off at the edge portion 7 of the core end face outlet of the slot 2 is reduced, and the insulation failure can be reduced.
However, when the core 1 rotates at a high speed of about 30000 rpm like a starter, a centrifugal force is generated in the coil 4, and therefore this force must be maintained at the boundary surface between the cured varnish 5 and the insulating paper 3. The starter that repeats starting and stopping has a problem in that the centrifugal force cannot be maintained because a gap is created in the boundary surface due to the difference in heat shrinkage at high temperature and the adhesive strength is significantly reduced. In addition, there is also a problem that the insulation property is deteriorated due to the difference in heat shrinkage at high temperature due to the difference in the materials of both. On the other hand, in the conventional example shown in FIG. 7, since the powder insulating layer 6 formed on the inner surface of the slot and the varnish 5 are made of different materials, the same problem as in the above-mentioned conventional example occurs, and instead of the varnish 5, the same kind of material is used. When the powder resin is filled, there is a problem that it is difficult to sufficiently permeate the powder resin to the deep portion of the slot. Also, JP-A-59-11035
In the conventional example in which the insulating paper is attached only to the edge portion of the slot outlet described in No. 5, not only the adhesive strength is lowered in the slot edge portion due to the difference in material between the insulating paper and the varnish, but also the adhesive strength is reduced. There is also a problem that the space factor of the coil is reduced by the thickness of the insulating paper on the core end face side, and the armature becomes large.

The object of the present invention is to improve the adhesive strength and insulation performance without causing insulation failure during coil winding work, to allow the varnish to penetrate deep into the slot, and to improve the space factor of the coil. An object of the present invention is to provide an armature of a rotating electric machine that can be miniaturized and a manufacturing method thereof.

[Means for Solving the Problems]

The above-mentioned purpose is, before embedding the coil in the slot of the armature core, while rotating the armature core, a liquid heat-resistant resin containing an inorganic filler is attached to the slot inner surface and the core end surface, while rotating the armature core. This is achieved by the armature of a rotating electric machine made by a manufacturing method in which the liquid heat resistant resin is heated and hardened, then a coil is wound in the slot, the same liquid heat resistant resin is filled in the slot, and heat cured. To be done.

The liquid heat-resistant resin adhered to the inner surface of the slot and the end surface of the core is obtained by heating the powdery resin to a temperature at which it changes into a liquid phase at room temperature. It is performed by heating.

The liquid heat-resistant resin to be adhered to the inner surface of the slot and the end surface of the core is, for example, a powder of epoxy resin and phenol resin containing one of alumina, silica and talc as an inorganic filler, which is heated to change into a liquid phase. It can be

Structurally, the armature of the rotating electric machine has at least the inner surface of the slot of the armature core and the end surface of the core, so that the reduction of the holding force due to the centrifugal force at the time of high-speed rotation is prevented and the insulation is improved. Further, both heat-resistant resins adhere to and fill the liquid phase in a heated state, so that they penetrate into the deep portion of the slot. Further, by securing the coating layer on the edge portion of the end face of the core, it is not necessary to attach insulating paper, the space factor of the coil is improved, and the size can be reduced.

〔Example〕

 Preferred embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show the structure of the armature of the rotary electric machine in the intermediate state before winding the coil in the slot, and FIG. 3 shows the slot cross section of the armature after completion.

In FIG. 1 and FIG. 2, the armature 10 has a rotating shaft 11
And a core 12 having a laminated structure mounted on the rotary shaft 11, and a plurality of slots 13 are formed in the core 12. At least the edge portion 15A of the slot inner surface 14 and the core end surface 15 at the slot outlet is provided with a coating layer obtained by heating and curing a liquid heat-resistant resin containing an inorganic filler at the edge portion of the liquid heat resistant slot outlet containing an inorganic filler. A coil is wound on the coating layer in the slot, and an insulating material obtained by heating and curing the same liquid heat-resistant resin as the coating layer is filled around the coil in the slot.

[Action]

While rotating the armature core, the liquid heat-resistant resin containing inorganic filler is attached to the slot inner surface and the core end surface, and the liquid heat-resistant resin is heat-cured while rotating the armature core. Not
At least the edge portion of the slot outlet on the end surface of the core is also covered. As a result, a coating layer formed by heating and hardening the liquid heat-resistant resin is formed on the edge portion of the end face of the core, and this coating layer prevents insulation failure from occurring at the edge portion during coil winding work. Since this coating layer is the same as the resin of the insulating material filled in the slots thereafter, the adhesion is good, there is no difference in thermal contraction at high temperature, and no gap is formed on the boundary surface. Coating layer 1 obtained by heating and curing this resin
6, 17 are provided. After that, in the armature 10, the coil 18 is wound in the slot 13, and the coating layer 1 is formed around the coil 18 in the slot 13 as shown in FIG.
The same liquid heat resistant resin as that of No. 6 is filled with the insulating material 19 which is heat-cured to complete the armature. In the specification of the present application, the term “identical” is used to mean that the heat-resistant resins themselves are the same and that the presence or absence of an inorganic filler or the proportion thereof is different.

The armature 10 is manufactured as follows.

The powdery heat-resistant resin containing an inorganic filler is heated to a temperature at which it changes to a liquid phase at normal temperature, and this liquid heat-resistant resin is applied to the inner surface 14 and the core end surface 15 of the slot 13 while rotating the armature core 12. The coating thickness is about 200 μm, and the coating method is dropping, dipping, spraying or the like. When the dropping is performed, as shown in FIG. 4 (A), the two dropping nozzles 20 are arranged above the positions of both end surfaces of the core 12. In the case of dipping, the lower side of the core 12 is dipped in the liquid resin 21 as shown in FIG. To increase the thickness of the liquid heat-resistant resin layer, the composition and temperature may be appropriately selected to increase the viscosity or the number of times of application may be increased. Then
Then, as shown in FIG. 4 (B), the heat-resistant resin is heated and cured while further rotating the core 13.

Here, as the heat resistant resin, epoxy resin, unsaturated polyester resin, oil-modified unsaturated polyester resin, alkyd resin, phenol-modified alkyd resin, phenol resin, oil-modified phenol resin, vinyl formal resin, epoxy ester resin, polyptadiene resin, Urethane resin, polyimide resin, polyamide-imide resin, etc. can be used. Further, although the inorganic filler is for increasing heat resistance, it also serves to harden the coating layer. As the inorganic filler, silica, alumina, talc, etc. can be used.

As an example, a powder of epoxy resin and phenol resin is mixed with an inorganic filler of alumina, and this is added to about 100 to 1
It becomes liquid when heated to about 50 ° C. When this varnish is dropped by the method shown in FIG. 4 (A) described above while rotating the core 12 heated to the same degree at about 50 rpm, the liquid heat resistance dropped in the slots 13 at both end face positions of the core 12 Since the resin has a slot side wall in the circumferential direction and cannot flow, the resin flows axially left and right in the slot 13. At this time, the liquid heat-resistant resin flowing toward the core end surface 15 drops and adheres onto the core end surface 15 beyond the edge portion 15A of the core end surface 15, but since the core 12 is rotating, The liquid heat-resistant resin that has adhered moves to the outside in the radial direction due to centrifugal force, and a certain amount or more of the liquid heat-resistant resin is prevented from adhering to the core end surface 15. On the other hand, the liquid heat-resistant resin that has flowed toward the center of the core in the slot 13 also moves outward in the radial direction by centrifugal force and covers the inner surface 14 of the slot. The above is repeated, and the liquid heat resistant resin dropped from the two dropping nozzles 20 is the core 1
2 on the inner surface 14 of the slot and the end surface 15 of the core. After completion of dropping, about 200 rpm while continuing the same rotation of about 50 rpm.
When heated to about 250 ° C, it cures in about 30 minutes.

Even during this heat curing, the resin applied to the end surface 15 of the core 12 receives a radially outward force due to the centrifugal force, so that the edge portion 1 at the slot outlet is more than the flat portion of the core end surface 15.
5A becomes thicker, and a pool is generated here. On this occasion,
Particularly, the relatively heavy inorganic filler contained in the liquid heat resistant resin is concentrated in this portion by the centrifugal force. This pool becomes the above-mentioned coating layer 17 on the edge portion of the end face after curing. As a result, the edge portion 15A of the core 12, which is in contact with the bent portion of the coil during the coil winding operation, has the hard coating layer 17 of the tissue.
Insulation is enhanced by the above, the insulation is improved, and peeling of the coil coating due to bending at the edge portion 15A can be prevented, and insulation failure can be prevented.

After the winding of the coil 18 is completed, the same heat-resistant resin as the coating layers 16 and 17 which is heated in a liquid state is impregnated into the slot 13 and cured by heating. As a result, the insulator 19 is formed. Since the insulator 19 and the coating layer 16 are the same, the difference in heat shrinkage at high temperature is small, and the insulating property and the adhesive property are improved.

〔The invention's effect〕

According to the present invention, while rotating the armature core, a liquid heat-resistant resin containing an inorganic filler is attached to the slot inner surface and the core end surface, and the liquid heat-resistant resin is heated and cured while rotating the armature core. A coating layer formed by heat-curing a liquid heat-resistant resin is formed on the edge portion of the end face, and the coating layer prevents insulation failure from occurring at the edge portion during coil winding work. In addition, this coating layer,
Since it is the same as the insulator filled in the slot, there is no difference in thermal contraction at high temperature, the holding force resistance due to the centrifugal force at high speed rotation is prevented, and the insulating property is improved. Further, since the same resin is used, the production equipment can be simplified and the work becomes easy. Further, both heat-resistant resins adhere to and fill the liquid phase in a heated state, so that they penetrate into the deep portion of the slot. Further, by securing the coating layer on the edge portion of the end face of the core, it is not necessary to attach insulating paper, the space factor of the coil is improved, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an intermediate state of a manufacturing process of a rotor of a rotary electric machine according to an embodiment of the present invention, and FIG.
Fig. 4 is a sectional view taken along the line II-II of the drawing, Fig. 3 is a sectional view of the rotor slot after completion, and Figs. 4 (A) and (B).
FIG. 6 is a diagram showing a step of applying the liquid heat-resistant resin by dripping and a subsequent heat curing step, FIG. 5 is a diagram showing a step of applying the liquid heat-resistant resin by immersion, and FIG. FIG. 7 is a sectional view showing a slot insulation by the method, FIG. 7 is a sectional view showing a slot insulation by another conventional method, and FIG. 8 is a sectional view of a core end face edge portion of a slot outlet at the time of winding work. It is a top view. Explanation of symbols 10 ... Armature, 12 ... Core 13 ... Slot, 14 ... Slot inner surface 15 ... Core end surface 15A ... Edge portion of core end surface 16, 17 ... Coating layer, 18 ... Coil 19 ... …Insulator

Front page continuation (72) Inventor Naoki Kamata 2520 Takaba, Takata, Ibaraki Prefecture, Sawa Plant, Hitachi Ltd. (72) Inventor Seibuo Abe 2520, Takaba, Katsuta, Ibaraki Hitachi Sawa Plant, Ltd. (72) Inventor Yasuaki Watanabe 2520 Takaba, Takata, Ibaraki Prefecture, Sawa Factory, Hitachi Ltd. (72) Ryomichi Ono 2520, Takaba, Katsuta, Ibaraki, Ltd., Sawa Factory, Hitachi (72) Inventor Kazuo Tahara 4026 Kujimachi, Hitachi City, Ibaraki Prefecture Hitachi Research Laboratory, Ltd. (72) Inventor Eiji Omori 4-13-1, Higashimachi, Hitachi City, Ibaraki Hitachi Chemical Co., Ltd. Yamazaki Plant

Claims (5)

[Claims] 1. Before embedding the coil in the slot of the armature core, while rotating the armature core, liquid heat resistant resin containing an inorganic filler is attached to the inner surface of the slot and the end surface of the core to rotate the armature core. While the liquid heat-resistant resin is heat-cured, the coil is wound in the slot, the same liquid heat-resistant resin is filled in the slot, and the heat-cured resin is heat-cured. . 2. The liquid heat-resistant resin adhered to the inner surface of the slot and the end surface of the core is obtained by heating the powdery resin to a temperature at which it changes into a liquid phase at room temperature. The armature for a rotating electric machine according to claim 1, wherein the armature is heated to a temperature even higher than that. 3. The liquid heat resistant resin to be adhered to the inner surface of the slot and the end surface of the core is a liquid obtained by heating a powder of epoxy resin and phenol resin containing one of alumina, silica and talc as an inorganic filler. The armature for a rotating electric machine according to claim 1, wherein the armature is changed to a phase. 4. An armature core slot inner surface and at least the slot outlet edge portion of the core end surface are provided with a coating layer obtained by heating and curing a liquid heat resistant resin containing an inorganic filler, and the coating layer inside the slot An armature for a rotating electric machine, characterized in that a coil is wound on the coil, and an insulating material obtained by heating and hardening the same liquid heat-resistant resin as the coating layer is filled around the coil in the slot. 5. Before burying the coil in the slot of the armature core, while rotating the armature core, liquid heat resistant resin containing an inorganic filler is attached to the inner surface of the slot and the end surface of the core to rotate the armature core. While the liquid heat-resistant resin is heat-cured, a coil is wound in the slot, the same liquid heat-resistant resin is filled in the slot and heat-cured, and the method for manufacturing an armature of a rotating electric machine is characterized. .