JPH0682525B2 - Double conductor paper winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a novel multi-conductor paper winding formed by winding and insulating kraft paper around the outer circumference of two parallel wire bodies that are insulated from each other. It is a thing.

[Prior Art] In recent transformers, there is a strong demand for smaller size and larger capacity, and a magnet wire having excellent dielectric breakdown voltage characteristics is desired.

As a coil magnet wight of a transformer or the like, there is a double conductor paper winding in which kraft paper is wound and insulated around the outer circumference of two strands of wire which are insulated from each other.

As a prior art of a multi-conductor paper winding in which kraft paper is wound around and insulated from the outer circumference of two strands of wire which are insulated from each other, Japanese Utility Model Publication No. 31-7451 and Japanese Utility Model Publication No. 31-7452 are known. There is a gazette.

The double-conductor paper winding disclosed in Japanese Utility Model Publication No. 317451 and Japanese Utility Model Publication No. 317452 uses two wire strands as both paper wire windings, or uses only one wire wire as paper wire winding. One of the strands is a bare wire, and kraft paper is wound around the outer circumference of these two parallel strands for insulation.

The dielectric breakdown voltage between the wires of this type of multi-conductor paper winding can be improved by increasing the thickness of the kraft paper used or by increasing the number of windings of the kraft paper. However, the multi-conductor paper winding, in which the thickness of the kraft paper used is thick or the number of turns of the kraft paper is increased, the finished size becomes large, which hinders the miniaturization and the large capacity of the electric equipment, and further increases the manufacturing cost. There is a drawback.

Therefore, in order to improve the dielectric breakdown voltage between the strands of this type of multi-conductor paper winding, a multi-conductor paper winding using an enameled wire having excellent dielectric breakdown voltage characteristics as a strand has been studied.

This double-conductor paper winding that uses the enamel wire as the element wire can improve the target dielectric breakdown voltage without increasing the finished size, but the enamel wire of the element wire is It has a poor compatibility with oil and a significantly high manufacturing cost, and as a result, it cannot be used as a substitute.

For this reason, there has been a demand for a multi-conductor paper winding that is inexpensive, does not cause an increase in finished dimensions, and has excellent dielectric breakdown voltage characteristics.

By the way, although powder coating insulation is relatively inexpensive, the resulting powder coating film is essentially porous and has a rough surface, and as a result, the electrical characteristics are inferior and, therefore, the double conductor paper winding. It was thought that it could not be applied at all as a strand of wire.

The following are disclosed as prior arts such as powder coating.

JP-B-51-22018 gazette: JP-B-51-22018 discloses, `` After preheating a conductor at a temperature below a predetermined value and performing fluid immersion coating, heating at a temperature below the above-mentioned value and then reflowing. A method for producing an insulated conductor by a fluidized immersion coating method, characterized in that the coating is carried out by immersion coating. "

However, in the element wire of the double conductor paper winding according to the present invention,
As described here, if the conductor is preheated at a temperature of a predetermined value or less and fluidized-dip coating is performed, then it is heated at a temperature of the above-specified value or more and fluidized-dip coating is performed again, there are many steps, and the cost is high. This leads to an increase in the thickness of the insulation and an increase in the finished size, which is beyond the object of the present invention. Moreover, Japanese Patent Publication No. 51-22018 discloses nothing about a double conductor paper winding formed by winding and insulating kraft paper around the outer circumference of two strands of wire that are insulated from each other according to the present invention. Not disclosed.

b. Japanese Utility Model Publication No. 31-11625, Japanese Utility Model Publication No. 31-11625 discloses, "Insulated wire core B in which an insulating paper 3 such as Manila paper or kraft paper is thinly wound around one conductor and the other conductor. Insulating paper 4 treated with a synthetic resin paint such as polyvinyl alcohol or vinyl acetate is wrapped around 1'together with an insulating wire core C, which is also thinly wound, and the insulating paper B is wound to a sufficient thickness. The structure of a multi-conductor winding formed by winding. "

However, as disclosed in Japanese Utility Model Publication No. 31-11625,
Insulating paper 3 such as manila paper and kraft paper and insulating paper 4 treated with synthetic resin paint such as polyvinyl alcohol and vinyl acetate are wound around conductors, respectively. If it is attempted to improve it, an increase in finished size is unavoidable, which is beyond the object of the present invention.

c. JP-A-51-13837 JP-A-51-13837 discloses that "a resin powder is electrostatically coated directly on a conductor and baked and cured, and then a thermosetting resin melt is applied and baked. The method of manufacturing an insulated wire according to ".

However, the manufacturing method of the insulated wire disclosed in this Japanese Patent Laid-Open No. 51-13837 simply involves electrostatically coating resin powder directly on the conductor,
The figure shows only that a thermosetting resin melt is applied and baked after baking and curing, and the two wires parallel to each other are insulated from each other as in the object of the present invention. Nothing is disclosed about a double conductor paper winding formed by winding and insulating kraft paper.

d. JP-A-52-42281 JP-A-52-42281 discloses that "a powdered copper resin coating is used on the outer circumference of a copper wire for winding or an aluminum wire for winding, which has been subjected to insulation treatment, A method for producing a fusible electric wire, characterized in that the fusible layer is formed by electrostatic coating. "

However, in the multi-conductor paper winding which is the subject of the present invention, the use of the fusible electric wire impairs the coil winding property and cannot be applied. Moreover, Japanese Patent Application Laid-Open No. 52-42281 discloses a multi-conductor paper winding in which kraft paper is wound around the outer circumference of two wire parallel bodies insulated from each other as in the present invention. Nothing disclosed.

e. JP-A-55-74011 JP-A-55-74011 discloses that "a film-forming auxiliary agent used for post-treatment of electrodeposition coating by powder coating after electrodeposition coating is powder coating material. A method for producing an enamel electric wire using a combination of electrodeposition coating and powder coating, which is characterized in that it facilitates formation of an insulating film for thick wires and thick walls. "

However, the use of an enamel electric wire in which the electrodeposition coating and the powder coating are used together in the multi-conductor paper winding which is the subject of the present invention cannot be applied because the insulating layer becomes thick and the finished size of the winding is increased. .

f. Japanese Patent Laid-Open No. 58-93109, Japanese Patent Laid-Open No. 58-93109 discloses that "a baking layer of a solvent type insulating paint or a solventless type insulating paint is used on an insulating film formed by powder coating. Insulated wire characterized in that

However, if the coating baking layer of the solvent type insulating paint or the solventless type insulating paint is provided on the insulating film formed by powder coating in the multi-conductor paper winding which is the subject of the present invention, the finish dimension is increased and the production is increased. It is difficult to apply because of increased cost and resistance to transformer oil.

g. JP-A-62-287515, JP-A-62-287515 discloses that "a synthetic resin powder is heat-fused on a conductor along the longitudinal direction of the conductor by an electrostatic powder coating method. Insulated wire having an insulating coating formed thereon, wherein the thickness of the insulating coating is changed along the longitudinal direction of the conductor. "

However, in the multi-conductor paper winding which is the subject of the present invention, if the film thickness of the insulating film is changed along the longitudinal direction of the conductor, variation in the finished dimension in the longitudinal direction and variation in the electrical characteristics in the longitudinal direction are caused. Therefore, it cannot be applied. In addition, Japanese Unexamined Patent Publication (Kokai) No. 62-287515 discloses a multi-conductor paper winding in which kraft paper is curtain-insulated around the outer circumference of two wire parallel bodies which are insulated from each other as in the present invention. Is not disclosed at all.

h. JP-A-63-43211 JP-A-63-43211 discloses, "There is a transition electric wire formed by transposing and twisting a plurality of flat insulated wires, and an insulating tape is provided on the outer circumference of the upstanding electric wire. In a dislocation electric wire formed by winding, a self-lubricating powder resin insulation element wire is used as the rectangular insulated electric wire.

However, in the multi-conductor paper winding which is the subject of the present invention, there is no need to use the self-lubricating powder resin insulating wire.

i. Microfilm of Japanese Patent Application No. 59-43297 The microfilm of Japanese Patent Application No. 59-43297 states that "a plurality of flat rectangular enameled wires and a plurality of layers are integrally formed by bonding to have a degree of plasticity necessary for coil forming. A composite wire for electric machine winding, characterized in that a common insulation is applied to a conductor which is fixedly adhered to form a multi-conductor, and is covered with an insulating paper.

However, in the multi-conductor paper winding which is the subject of the present invention, a large number of strands are not bonded together.

[Problems to be Solved by the Invention] The present invention has been tried in view of such a point, and an object of the present invention is to solve the above-mentioned drawbacks of the prior art and to increase the finished size. The purpose of the present invention is to provide a multi-conductor winding that can significantly improve the dielectric breakdown voltage.

[Means for Solving the Problems] The gist of the present invention is that the elements are insulated from each other.
In a multi-conductor paper winding formed by winding and insulating an insulating paper around the outer periphery of two parallel strands of wire, at least one of the two strands of wire.
The book is a multi-conductor paper winding characterized by using powder coated insulated wires.

In the present invention, the conductor shape of the wire is not particularly limited, but a flat conductor wire that is easy to arrange with flat surfaces facing each other is suitable.

In the present invention, the powder coating resin preferably has good dielectric breakdown voltage characteristics and good transformer oil resistance, such as epoxy resin, polyester resin, polyesterimide resin, acrylic resin, maleimide resin, etc. Can be used. The thickness of these powder resins is not particularly limited, but is preferably 30 to 120 μm from the viewpoint of dielectric breakdown voltage, flexibility and suppression of dimensional increase.

In the present invention, the number of powder-coated insulated electric wires is only one, but there is no problem even if both of them are powder-coated insulated electric wires.

Insulating paper used for peripheral insulation in the present invention is kraft paper,
Any of cyanoethyl paper, semi-synthetic paper, aromatic polyamide woven cloth, etc., its thickness is 25μ, 55μ, depending on design specifications.
125 μ or the like can be used as appropriate. [Operation] In the multi-conductor paper winding of the present invention, the powder coated insulated electric wire is used as the element wire so that there is no increase in manufacturing cost and finished size, The breakdown voltage is significantly improved.

That is, since the powder-coated insulated wire is formed by collecting powder, the coated resin film layer is a porous rough surface with high and low, and the dielectric breakdown voltage is low as a single wire, but surprisingly it does not When it is used as the wire of the conductor paper winding, its porous high-low rough surface creates an air gap with the adjacent wire, and the dielectric breakdown voltage can be effectively improved.

[Embodiment] Next, an embodiment of the multi-conductor paper winding of the present invention will be described with reference to the drawings.

FIG. 1 is a cross section showing an embodiment of the multi-conductor paper winding of the present invention. In FIG. 1, reference numerals 1 and 2 are flat conductor wires, and 3 is a powder resin film layer formed by powder coating the surface of the flat conductor wire 2. The powder resin film layer 3 is powder-coated with an epoxy resin powder coating and has a thickness of 72 μm. Four
Is a peripherally insulated kraft paper, which is a kraft paper with a thickness of 125 μm wound twice.

Next, as a comparative example, a multi-conductor paper winding formed by combining a paper winding and a rectangular bare conductor was obtained. In addition, the conductor dimensions and the outer peripheral insulation of the used paper winding and the rectangular bare conductor were the same as those used in Example 1. However, the insulating paper layer of the wire winding of the wire is 110 μm
Is. This is the thickness 55 most commonly used for paper winding.
This is because the kraft paper of μm was wound twice.

The thus-obtained one example product of the present invention and each comparative example product were sampled in a length of 1 m, and the dielectric breakdown voltage between the wires was measured. Table 1 shows these measurement results.

As can be seen from Table 1, the products of Examples of the present invention have a much higher dielectric breakdown voltage between the strands than the Comparative Example, even though the insulating layer of the strands is thinner.

[Advantages of the Invention] The multi-derivative paper winding of the present invention can improve the dielectric breakdown voltage between the strands without increasing the finished size, is inexpensive, and is industrially useful as a magnet wire for a small transformer coil. is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment of a multi-conductor paper winding of the present invention. 1,2: conductor, 3: powder resin film layer, 4: outer insulation layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-51-13837 (JP, A) JP-A-52-42281 (JP, A) JP-A-55-74011 (JP, A) JP-A-55- 86006 (JP, A) JP 58-93109 (JP, A) JP 62-287515 (JP, A) JP 63-43211 (JP, A) Actual development 59-26814 (JP, U) Actually open 59-185815 (JP, U) Actually open 60-156612 (JP, U) Special public 51-22018 (JP, B2) Actual public 31-7451 (JP, Y1) Actual public 31-7452 (JP, Y1) Jitsuko Sho 31-11625 (JP, Y1)

Claims (1)

[Claims] 1. In a multi-conductor paper winding, wherein insulating paper is wound and insulated on the outer circumference of two parallel wire bodies which are insulated from each other, at least one of said two wire strands is A multi-conductor paper winding characterized by using powder coated insulated wires.