JPS63283111A - Insulated wire for transformer coil and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent an insulating paper from being distorted or broken down for improving its quality by a method wherein the insulating paper previously coated with a bonding agent is overlapped and pressure-fixed with a preheated bare flat square copper wire by a heating rolls. CONSTITUTION:A bare flat square wire 1 is fed from a feeder roll 8 to be heated at specified temperature passing through a heating furnace 3. The preheated copper wire 1 is fed to a heat-pressurizing device comprising an upper side heating roll 4 and a lower side heating roll 5. On the other hand, an insulating paper 2 coated with a bonding agent increasing its bonding property by preheating process is previously wound around another feeder roll 9 to be led for winding around the roll 4 so that the insulating paper 2 may be overlapped and pressure-fixed with the copper wire 1 preheated by the heating furnace 3 by the rolls 4, 5. The preheat of copper wire 1 once heated by the heating furnace 3 is sustained so that the bonding process with the insulating paper 2 may be facilitated. Through these procedures, the insulating paper 2 can be prevented from being distorted or broken.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an insulated wire that insulates the conductor layers of a transformer coil with insulating paper, and a method for manufacturing the same, and in particular, to a method for preventing distortion and distortion of the insulating paper. The present invention relates to an insulated wire for coils of transformers and a method for manufacturing the same, which improves quality.

[Conventional technology]

As a conventional insulated wire for transformer coils and a method for manufacturing the same, there is one disclosed in Japanese Utility Model Publication No. 56-5300, for example. This is done by preparing a piece of insulating paper with a width selected to be larger than the sum of the width of the bare rectangular copper wire and the thickness of both sides, and smaller than the entire circumferential surface of the bare rectangular copper wire, and using a die-like jig to Manufacture insulated wires by bonding wires and insulating paper,
This is wound around the transformer iron core to form a coil.

In addition, Fig. 3 shows a simple method in which bare rectangular copper wire and pre-prepared insulating kraft paper are simply integrated and wound around the transformer iron core, where la, lb...1n are bare rectangular copper wires, 2a, 2b
...2n is insulating kraft paper for insulating between copper layers, and 10 is a transformer iron core.

[Problem that the invention seeks to solve]

However, according to the conventional insulated wire for transformer coils and its manufacturing method, when the bare rectangular copper wire and the insulating paper are brought into close contact with each other and integrated using a die-like jig to make the insulated wire, the insulating paper tends to bend. There is an inconvenience that distortion occurs, and when winding the bare rectangular copper wire and insulating paper together around the transformer core, it is best to blow air to make the insulating paper stick tightly to the transformer core. , the insulating paper may wrinkle or tear. In addition, voids are generated due to the entrapment of air, and foreign matter is mixed in between the conductor and the insulation, resulting in a deterioration in quality.

[Means for solving problems]

The present invention has been made in view of the above, and does not cause bending, distortion, wrinkles, etc. to occur in the insulating paper, nor does the insulating paper tear, and furthermore, does not cause deterioration in insulation due to voids or foreign matter contamination. In order to prevent quality deterioration due to the occurrence of heat, the bare rectangular copper wire is preheated by heating to a predetermined temperature using a heating means, and the insulating paper coated with adhesive is layered and crimped onto the preheated bare rectangular copper wire using a heating roll. The present invention provides an insulated wire for coils of transformers, and a method for manufacturing the same, in which bare rectangular copper wire and insulating paper can be bonded easily and reliably.

That is, in the insulated wire for transformer coils of the present invention, insulating paper coated with adhesive in advance is adhered to one side of the bare rectangular conductor, and the insulating paper has free ends longer than the thickness of the bare rectangular conductor on both sides. has.

Moreover, the manufacturing method of the vA edge wire for transformer coils of the present invention includes the following steps.

(1) Process of heating four bare rectangular wires The bare rectangular conducting wire supplied from the supply roll is heated to a predetermined temperature in a heating furnace. This enhances the adhesion effect when the bare rectangular conducting wire and the insulating paper are pressed together by a pair of upper and lower heating rolls, which will be described later.

The heating means is not limited to a heating furnace, and electrical heating or the like may be used.

(2) Process of supplying insulating paper coated with adhesive A supply roll for supplying insulating paper is wrapped with insulating paper coated with adhesive in advance. This adhesive completely adheres the bare rectangular conductor and the insulating paper. The adhesive material is preferably one that increases its adhesiveness when heated, and the width of the insulating paper is preferably greater than the sum of the width of the wire and the thickness of both sides.

(3) Process of bonding bare rectangular conducting wire and insulating paper The insulating paper supplied by the supply roll is guided so as to be wrapped around the upper heating roll, and the bare rectangular conducting wire and the upper heating roll are preheated in a heating furnace. Then, they are overlapped and pressed together by a lower heating roll. Since the bare rectangular conducting wire is preheated, even if the ambient temperature drops, the temperature of the adhesive will not drop (to stabilize the adhesive effect).

[Effect]

Through the above steps, the bare rectangular conductive wire supplied from the supply roll is preheated and then stacked and pressed with the insulating paper supplied from another supply roll and preliminarily coated with adhesive to form an insulated wire.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the insulated wire for transformer coils and its manufacturing method of this invention are demonstrated in detail.

FIG. 1 shows an embodiment of the present invention, in which a flat rectangular copper wire 1 is insulated by an insulating paper 2 and becomes an insulated wire, and a bare rectangular copper wire '4f
The insulating paper 2 that insulates A1, the heating furnace 3 that heats and preheats the bare rectangular copper wire 1, and the lower heating roll 5 that guides the insulating paper 2 and transfers the bare rectangular copper 'fa1 and the insulating paper 2 to the lower heating roll 5. The upper heating roll 4 overlaps and presses the bare rectangular copper wire 1 and the insulating paper 2 between them, the lower heating roll 5 overlaps and presses the bare flat copper wire 1 and the insulating paper 2 with the upper heating roll 4, and the upper heating roll 4 and lower heating roll Insulated type 'ftIA manufactured by overlapping and crimping by 5.
6, a winder 7 that winds up the manufactured insulated vA6,
It consists of a supply roll 8 that supplies the bare rectangular copper wire 1 and a supply roll 9 that supplies the insulating paper.

In the above configuration, the bare rectangular copper wire 1 is supplied from the supply roll 8, passes through the heating furnace 3, and is heated to a predetermined temperature. The preheated bare rectangular copper wire 1 is sent to heating and pressing devices of an upper heating roll 4 and a lower heating roll 5. In addition, an insulating paper 2 coated with an adhesive that increases tackiness when heated is wrapped around the supply roll 9 in advance, and is guided so as to be wrapped around the upper heating roll 4, and is heated in the heating furnace 3. Flat copper wire 1, upper heating roll 4 and lower heating roll 5
Overlap crimping is performed by. The bare rectangular copper wire 1 heated once in the heating furnace 3 is preheated and can be easily bonded to the insulating paper 2. After adhesion is performed using a heating and pressurizing device, the wire becomes an insulated wire 6 and is wound up by a winding machine 7.

Figure 2 (al indicates the insulated wire of the present invention, bare rectangular copper wire 1
It shows a state in which an insulating paper 2 is laminated on one side of the board. In that case, the width of the insulating paper 2 is larger than the width of the bare rectangular copper wire 1 (at least twice the thickness of the bare rectangular copper wire 1), or in other words, when forming the coil, such a laminate material is wound. When the insulation paper 2 protruded from the bare rectangular copper wire 1
This is because the side surface exposed portion of the bare rectangular copper wire 1 is effectively suppressed.

In the above embodiment, the bare rectangular copper wire has a width of 200-1 and a thickness of 0.
5. Insulating paper has a width of 200 + 10 = 210 □ and a thickness of 70
I used μ kraft paper.

By using this laminated insulated wire, the second
Various winding shapes as shown in Figures (b) and (C1) can be adopted.

〔Effect of the invention〕

As explained above, according to the insulated wire for transformer coils and the manufacturing method thereof of the present invention, a bare rectangular conductor is preheated by heating to a predetermined temperature by a heating means, and an insulated wire coated with an adhesive in advance is By overlapping and pressing the paper with the bare rectangular conductor which has been preheated by the heating rolls provided above and below, the bare rectangular conductor and the insulating paper are bonded easily and reliably, so that the insulating paper does not bend, warp or wrinkle. This prevents the occurrence of such problems and the tearing of the insulating paper, and also prevents the insulation from deteriorating due to voids and foreign matter contamination. This can prevent the quality of the coil from deteriorating.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. FIGS. 2(a), ('b), and (C) are cross-sectional views showing the insulated wire of the present invention. Figure 3 is a sectional view showing a conventional transformer coil. Explanation of symbols 1, la, 1b-1rt-----One bare rectangular copper wire 2.2a, 2b...2n---Insulating paper 3-- - Heating furnace 4 - Upper heating roll 5 - Lower heating roll 6 - One - Insulated wire 7 - -・・・・− Winder 8.9・・−・−・−・・−Supply roll 10・−・−・
・−・Transformer iron core patent applicant Hitachi Cable Co., Ltd. Agent Patent attorney Taira 1) Tadao 1・−・−・・
--- Bare rectangular copper wire 2 --- Insulating paper 3 --- Heating furnace 4 --- Upper heating roll 5 ---・－・・
-・-Lower heating roll 6-・-・・・・Insulated wire 7・・・・・・・Winder 8.9・・・・・・Supply roll Fig. 1 Figure 2 (α) Fu (C) 1a, 1 b-1rr-----One bare rectangular copper wire 2a, 2b-2rr----One Insulating paper 10 −−−−−−−−−−−−One transformer iron core One piece rolling

Claims (2)

[Claims] (1) Insulated wire for transformer coils that is wound around the core of a transformer to form a coil, a bare rectangular conductor having a prescribed width and a thickness smaller than this width; An insulated wire for a coil of a transformer, characterized in that it is made of insulating paper that is adhered to one side of the predetermined width and has free ends on both sides with a length at least greater than the thickness. (2) A method for manufacturing insulated wire for transformer coils, which is wound around the iron core of a transformer to form a coil, which includes the steps of heating a bare rectangular conductor to a predetermined temperature using a heating means, and applying adhesive in advance. A method for producing an insulated wire for a transformer coil, the method comprising: supplying insulated paper; and stacking the heated bare rectangular conducting wire and the insulating paper and heat-bonding them using a heating roll.