JP3030162B2 - Rotating electric machine and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine such as an induction motor, a motor for a vehicle and the like and a method for manufacturing the same, and more particularly, to a suitable operation under conditions where moisture resistance and water resistance are required. The present invention relates to a rotating electric machine and a manufacturing method thereof.

[0002]

2. Description of the Related Art The insulation of an electrically insulated wire ring of a rotating electric machine has been improved year by year by the development of new materials, and the reliability has been improved.
However, induction motors for pumps and main motors for vehicles are often used outdoors, and some are used in high-humidity atmospheres, compared to general induction motors installed indoors. The operating environment is harsh. For this reason, a rotating electrical machine used under such conditions is required to have high reliability regarding moisture resistance and water resistance. In particular, the insulation of the electrically insulated wire used therein is an important technical issue.

Conventionally, as a method of manufacturing an electrically insulated wire ring of a rotating electric machine to be applied to these, Japanese Patent Application Laid-Open No.
As disclosed in the official gazette, a method of forming a heat-fusible hydrophobic insulating layer on the outside of a mica insulating layer, forming a heat-shrinkable insulating layer thereon, then incorporating the heat-shrinkable insulating layer into an iron core, and integrally impregnating the same. As described in the prior art of Japanese Patent Application No. 62-277425, a winding having a conductor provided with an insulating layer, an iron core having a slot into which the winding is inserted, and a slot having a slot for fixing the winding are provided. A groove provided on the outer peripheral side and a wedge inserted into the groove, and after combining these, in a method of manufacturing a rotary electric machine in which varnish is impregnated integrally, at least the entire surface of the wedge which is in contact with the iron core groove before varnish impregnation. A method of reliably preventing the varnish from flowing out by applying a curing catalyst for the impregnated varnish, or a method of performing the varnish treatment twice or a method of rotational curing in an electrically insulated wire manufactured by an integral impregnation method. To It is known whether such also serve as a hydrophobic insulating layer by use with thicker layers of impregnating varnish.

Further, as disclosed in Japanese Patent Application Laid-Open No. 58-182443, the stress at the time of thermal contraction of a coil in a slot in an iron core of a long rotor of a rotating electric machine such as a turbine generator is reduced. In order to prevent plastic deformation of the coil, in a rotor of a rotating electrical machine having a coil housed in a slot of the rotor core and supported on its radial side by a wedge via an insulating block, the surface of the coil is made of fluororesin. There is also known one provided with a coating layer.

[0005]

However, the operation of winding a hydrophobic insulating tape to form a hydrophobic insulating layer requires an additional winding operation in addition to the mica tape insulation. Requires the number of steps.
In addition, the method of impregnating the varnish twice and the method of spin-drying have the disadvantages that the working efficiency is insufficient and the equipment becomes large.

In addition, a long rotor of a turbine generator provided with a fluororesin coating layer on a coil surface in a slot of an iron core of an iron core has a plurality of insulating blocks which are originally a main insulation and a plurality of slots which are located in a slot armor. The purpose is to improve the slipperiness between the coils, thereby reducing the stress generated during thermal contraction of the coils or to prevent the plastic deformation of the coils due to centrifugal force. It has been difficult to apply the present invention to a device in which an insulated wire is exposed to the side of an iron core, such as a stator of a rotating electric machine such as a motor or a motor for a vehicle.

An object of the present invention is to form a hydrophobic layer on a whole or at least an exposed portion of an electrically insulated wire of a rotating electric machine in which an insulated wire is exposed on a side of an iron core by a simple material and a simple method. Accordingly, an object of the present invention is to provide a rotating electric machine having excellent moisture resistance and water resistance, and to provide a method for manufacturing the same.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the object, the present invention provides an iron core having a slot for inserting an insulated wire loop, a part of which is provided on a side of the iron core. A rotating electrical machine having an insulated wire loop inserted into the slot in an exposed form, wherein the insulated wire loop is formed by winding an insulating film or mica tape and further winding a glass tape thereon. A rotating electric machine is disclosed, wherein a fluorine-based paint is applied to at least the entire outermost layer of the exposed portion of the insulated wire loop.

The present invention also provides an iron core having a slot into which an insulated wire is inserted, and an insulated wire inserted into the slot in such a manner that a part thereof is exposed to the side of the iron core. Then, after forming an insulating layer by winding an insulating film or mica tape on the insulated wire and further winding a glass tape thereon, insert the insulated insulated wire into the iron core, if necessary. Subject to varnish treatment,
A method for manufacturing a rotating electric machine, further comprising a step of applying a fluorine-based paint to the entire outermost layer of the exposed portion of the insulated wire loop is also disclosed.

As a modified example of the above-mentioned manufacturing method, an insulating film or mica tape is wound around an insulated wire loop, a glass tape is wound thereon, and a water-repellent fluorine-based paint is applied. The insulated wire loop on which the insulating layer is formed may be incorporated into an iron core.
In addition, a varnish treatment may be performed as needed before the step of applying the fluorine-based paint.

[0011]

Since the fluorine-based paint can be diluted with an appropriate solvent and applied, even a complicated shape such as an insulated wire can be uniformly applied to the surface. When the fluorine-based paint dries, an external substance (eg, water) peculiar to the fluorine atom contained therein
Can give a very small characteristic to the surface of the insulated wire loop. In other words, since a water-repellent surface layer is formed on the surface of the insulated wire, an electrically insulated wire having good moisture resistance and water resistance can be obtained, and as a result, moisture resistance and water resistance are required. It is possible to obtain a rotating electric machine that can be suitably operated under the conditions.

[0012]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 5 shows a flow chart for manufacturing the electrically insulated wire loop 3 according to the present invention. In this example, a wire conductor 1 having two glass-coated copper wires and wound a plurality of times (five times) was formed into the shape shown in FIG. Next, as shown in FIG. 2, a polyester film-backed mica tape as an insulating tape is wound as an insulating layer 2 on the outside of the wire conductor 1 having the above-mentioned shape in a half-stacked manner three times. Was wound once to form an insulating layer, and an insulated wire loop 3 was formed.

Next, an iron core 4, a stroller inner 6 made of polyamide paper, a wedge 7 made of an epoxy glass laminate,
And as shown in FIG. 3 and FIG.
The insulated wire loop 3 is inserted into a plurality of slots 5 formed in the iron core 4 in such a manner that both side portions a (only one side thereof is shown in FIG. 3) are exposed to the side of the iron core 4. .
At that time, a slot liner 6 was interposed between the peripheral wall of the slot 5 and the insulated wire ring 3, and a wedge 7 was inserted into the outer peripheral groove of each slot 5. Next, the insulated wire loops 3 inserted into the respective slots 5 are connected at the outer end of the iron core, and the
The same mica tape as the insulating layer 2 of the insulated wire loop 3 is wrapped around the S-made ring once and wrapped once, and then the glass tape is wrapped wrapped once around the outside and insulated. And
The varnish was cured once by static drying to cure the varnish.

Thereafter, a fluorine-based paint (for example, Bonflon # 1000 manufactured by Asahi Glass Coat and Resin Co., Ltd.)
Was applied by spraying over the entirety of the iron core 4 and the insulated wire 3 and the like to produce the insulated wire 9 of the electric machine.
Using the iron core 4 and the electric insulated wire loop 9, a rotating electric machine was manufactured by a usual method.

On the other hand, in order to confirm the effect of the present invention, a varnish treatment was applied to a structure similar to that of the above-mentioned embodiment in order to increase the thickness of an epoxy impregnated varnish instead of the fluororesin paint. A rotating electric machine having a moisture-proof electrically insulated wire according to the conventional method, which was used as a hydrophobic insulating layer, was manufactured. Next, the insulation characteristics of the electrically insulated wires of both rotating electric machines after the deterioration by wet heat were evaluated. The deterioration conditions were as follows: 200 ° C./4 day heat deterioration + 40 ° C. 95 ± 5% RH / 20 h moisture absorption deterioration, one cycle was performed for 10 cycles, and after 10 cycles both the insulated wires were immersed for 24 hours and then flooded. The medium insulation resistance was measured. The results show that both of them were 24
It was confirmed that the insulation resistance after time had 2000 MΩ or more.

From the above results, it was confirmed that the present invention can provide a rotating electric machine having an electrically insulated wire ring having sufficient moisture resistance and water resistance by a simple method of applying a fluorine-based paint. In addition, the present invention is not limited to the above-described embodiment. For example, the insulated wire loop is varnished alone, and then the insulated wire loop is also separately incorporated into the iron core. After that, apply a fluorine-based paint and then incorporate it into the iron core. Alternatively, as in the case of the integral impregnation method, varnish the insulation wire separately and then assemble it into the iron core. It will be easily understood that the object of the present invention can be achieved by a method of applying and manufacturing an electrically insulated wire loop.

Further, the materials such as the slot liner and the wedge are not limited to those described above, and all the materials conventionally used can be used as they are. In short, various materials can be used without changing the gist of the present invention. It can be implemented.

[0018]

According to the present invention, a hydrophobic layer utilizing the water repellency of fluorine atoms is uniformly provided on the surface of an insulated wire by a simple material and a simple method of applying a fluorine-based paint. It is possible to easily obtain an electrically insulated wire with good moisture resistance and water resistance because it can be used outdoors and in high-humidity atmospheres such as induction motors for pumps and main motors for vehicles. Therefore, it is possible to obtain a rotating electric machine suitable for performing the operation.

[Brief description of the drawings]

FIG. 1 is a plan view of an insulated wire loop common to the prior art and one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a partial plan view of the rotating electric machine according to the present invention.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a manufacturing flowchart of an electrically insulated wire loop.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wire conductor, 2 ... Insulation layer, 3 ... Insulated wire loop, 4 ... Iron core,
5 Slot, 6 Slot liner, 7 Wedge, 5 Fastener, 9 Electrically insulated wire loop

Continued on the front page (72) Inventor Kenji Mishima 3-1-1 Sachicho, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Shinichi Yamashiro 3-1-1 Sachicho, Hitachi-shi, Ibaraki Hitachi, Ltd. Hitachi Plant (56) References JP-A-58-64003 (JP, A) JP-A-3-43559 (JP, A) JP-A-60-2059 (JP, A) JP-A 63-64 13740 (JP, A) JP-A-2-120375 (JP, A)

Claims (3)

(57) [Claims] 1. A rotating electric machine comprising: an iron core having a slot for inserting an insulated wire loop; and an insulated wire loop inserted into the slot so that a part thereof is exposed to a side of the iron core. the insulation coil is insulated layer is formed by winding a glass tape thereon further winding the insulating film or mica tape and fluorine throughout the outermost layer of at least the exposed portion of the insulation coil A rotating electric machine to which a paint is applied. 2. An iron core having a slot for inserting an insulated wire loop, and an insulated wire loop to be inserted into the slot so as to be partially exposed to the side of the iron core, are provided. insulating line wheels film or mica tape winding suggested
Furthermore , after forming an insulating layer by winding a glass tape thereon, inserting the insulated insulated wire loop into the iron core, performing varnish treatment as necessary, and exposing the exposed portion of the insulated wire loop. A step of applying a fluorine-based paint to the entire outermost layer of the rotary electric machine. 3. An iron core having a slot for inserting an insulated wire loop, and an insulated wire loop to be inserted into the slot in such a manner that a part thereof is exposed to the side of the iron core, are provided. insulating line wheels film or mica tape winding suggested
Furthermore, an insulating layer is formed by winding a glass tape thereon, a varnish treatment is performed as necessary, and then a fluorine-based paint is applied to the entire outermost layer of the insulated wire loop. A method for manufacturing a rotating electric machine, comprising a step of inserting the insulated insulated wire loop. "