JPH06112054A - Electric coil component and winding method - Google Patents

Abstract

PURPOSE:To make it possible to utilize a space for a winding without waste, to make it possible to contrive a miniaturization of an electric coil component, and moreover, to obtain a high withstand voltage. CONSTITUTION:A coil 2 is wound on a bobbin 1 to form into a transformer for high voltage use. A conductor wire 8 is wound from the end part of a winding space to form a secondary coil 22, but outward windings to increase a winding pitch toward the other end of the space and return windings to increase the winding pitch toward the return direction on these outward windings are alternately repeated in order to execute a winding, the winding pitch is increased in a stepwise form to make thin the layer thickness of the winding end part and a cavity 9 of a roughly triangular section is made to form in the winding end part. The interval L between the coil 2 and a core material 3 can be made long by the amount of the cavity 9 and a high withstand voltage is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric winding component such as a transformer in which a conductive wire is wound around a winding core for forming a coil and a winding method thereof, and in particular, a forward winding and a backward winding of the conductive wire are sequentially and alternately arranged. The present invention relates to an electric winding component and a winding method for forming a coil by repeating the process.

[0002]

2. Description of the Related Art As is well known, as electric winding parts,
In general, a conductive wire is wound around a winding core to form a coil, and an insulating bobbin serves as a winding core, and a core material serving as a magnetic core is attached to the bobbin. Specifically, it is applied to transformers and choke coils, but in high voltage applications such as inverter devices and high voltage discharge circuits, insulation and withstand voltage between windings are important. Therefore, as shown in FIG. 4, an insulating tape 50 is interposed between the layers of the windings to prevent a rare short circuit, or, as shown in FIG. A plurality of flanges 13 are provided so as to form a coil by split winding. In addition, dielectric breakdown is likely to occur between the flanges at both ends of the core material having a short air gap and the ends of the winding. Therefore, the thickness of the bobbin between the flanges on both ends of the core material and the winding is increased.

[0003]

However, in such a conventional structure, since the insulating tape 50 and the flange portion 13 occupy a space, the utilization efficiency of the space to be wound is very poor, and the miniaturization which has been recently demanded. There was a problem that it was difficult to Further, in order to obtain a high withstand voltage between the core material 3 serving as the magnetic core, it is necessary to make the end portion of the bobbin 10 thick, which is also unfavorable because it hinders miniaturization.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to use the winding-wound space without waste, achieve miniaturization, and obtain a high withstand voltage. It is to provide a component and a winding method thereof.

[0005]

In order to achieve the above object, the present invention provides an electric winding component in which a conductor wire is wound around a winding core to form a coil, the conductor wire is wound a predetermined number of times from one end to the other end. Both forward and backward winding ends of the conductor wire are sequentially repeated by repeating forward winding and backward winding that is wound in a direction opposite to the forward winding with a predetermined number of windings less than the forward winding. Was thinned to form a void having a substantially triangular cross section at the winding end.

The present invention also relates to a method of winding a conductor wire around a winding core to form a coil, wherein the conducting wire is wound around the winding core from one end to the other end for a predetermined number of times, and a reverse winding thereof. The conducting wire is wound around the core while alternately repeating the backward winding in which the winding number is reduced by a predetermined number in the direction.

[0007]

The operation of the present invention will be described. As an electric winding component, a forward winding in which a conductive wire is wound a predetermined number of times and a backward winding in which the number of windings is reduced by a predetermined number compared to the forward winding are sequentially and alternately repeated to form a coil. Is formed. As a result, the layer thickness of the winding end portion becomes thin, and a void having a substantially triangular cross section is formed at the winding end portion. Therefore, the space between the core and the core, that is, the space between the core and the core, can be increased by the amount of the void, and a high withstand voltage can be obtained.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing a preferred embodiment of an electric winding component according to the present invention. The figure shows a transformer for high voltage. This transformer is equipped with an insulating bobbin 1 made of plastic or the like as a winding core, and a coil 2 is wound around the bobbin 1.

The bobbin 1 is provided with terminal pins 11 ..., 12 ... on the low voltage side and the high voltage side on the lower side thereof, and the winding ends of the coil 2 are appropriately attached to these terminal pins 11 ... It is configured to be connected. The E-shaped core material 3 made of ferrite is assembled to the engaging portion of the bobbin 1 so as to face each other, and the insulating sheet 4 is interposed between the core materials 3 and 3 and the bobbin 1. ing.

The coil 2 is a secondary coil 22 on the high voltage side.
The primary coil 21 on the low voltage side is wound on the upper side, and outer peripheral tapes 5 and 6 are arranged between the layers of the coils 21 and 22 and on the outer surface. The primary coil 21 is formed by winding the conductive wire 7 in a so-called layer winding manner, but the secondary coil 22 is wound by winding the conductive wire 8 by a winding method described later to form a substantially triangular cross section at the winding end. The voids 9 are formed.

The conductive wire 8 forming the secondary coil 22 is shown in FIG.
As shown in, the winding starts from the end portion a _{11 of the} space to be wound, but the forward winding a (a _{11 to} a _1x ) that advances the x-turn winding pitch toward the other end, and on the forward winding a Return winding b (b ₁₁ which advances the y-turn winding pitch in the return direction)
To b _1y ) are alternately and sequentially repeated for winding. The number of turns y of the return winding b is set smaller than the number of turns x of the outward winding a by a predetermined number. Therefore, as shown in FIG. 3, the winding pitch progresses in a stepwise manner, and the layer thickness at both winding end portions at the beginning and end of winding becomes thin. That is, the secondary coil 22 is formed by sequentially and alternately repeating the forward winding a in which the conductive wire 8 is wound a predetermined number of times and the backward winding b in which the predetermined number of windings is reduced compared to the forward winding a. Thus, the layer thickness of the winding end portion is reduced, and the void 9 having a substantially triangular cross section is formed at the winding end portion.

As described above, since the void 9 is formed in the bobbin 1 at the winding end portion of the coil 2, the core material 3 is correspondingly formed.
It is possible to lengthen the interval L between and and obtain a high withstand voltage. In this case, an insulating tape between layers for preventing a rare short circuit and a flange portion for partitioning are unnecessary, and it is not necessary to thicken the end portion of the bobbin 1. As a result, the space to be wound can be effectively used without waste, and the size can be reduced. Further, in forming the winding, the forward winding a and the backward winding b are sequentially and alternately repeated. However, since the reciprocal winding is simply repeated, the winding device can be operated at high speed and can be wound quickly. There is an advantage in manufacturing.

[0013]

As described above in detail, according to the electric winding component and the winding method thereof according to the present invention, the forward winding in which the conductor wire is wound a predetermined number of times and the predetermined number of windings are reduced compared to the forward winding. The coil is formed by alternately repeating the backward winding and the winding, which reduces the layer thickness of the winding end and forms a void having a substantially triangular cross section at the winding end. The space between the core and the core, that is, the space between the core and the core, can be increased by the amount of the void, and a high withstand voltage can be obtained. In this case, there is no need for an insulating tape between layers for preventing a rare short circuit or a flange for partitioning, and it is not necessary to thicken the end of the winding core. As a result, the space to be wound can be effectively used without waste, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an enlarged main part of FIG. 1 for explaining a winding step.

FIG. 3 is a schematic diagram showing a winding pitch.

FIG. 4 is a sectional view showing a conventional example of an electric winding component.

FIG. 5 is a cross-sectional view showing another example of the conventional example of the electric winding component.

[Explanation of symbols]

 1 bobbin (core) 2 coil 8 conductor 9 air gap a forward winding b return winding

Claims (2)

[Claims] 1. An electric winding component in which a conducting wire is wound around a winding core to form a coil, wherein the conducting wire is wound a predetermined number of times from one end to the other end, and a predetermined number is reduced compared to the outward winding. The forward winding and the backward winding that are wound in the opposite direction are alternately repeated with a certain number of turns to reduce the layer thickness at the winding end portions of the conducting wire and the winding end portion, thereby forming a substantially triangular shape at the winding end portion. An electric winding component characterized by having a void in cross section. 2. A method of winding a conducting wire around a winding core to form a coil, wherein the conducting wire is wound around the winding core a predetermined number of times from one end to the other end, and a predetermined winding is wound in a direction opposite to the outward winding. A winding method for an electric winding component, wherein the conducting wire is wound around the winding core while alternately repeating reverse winding and winding with a reduced number of turns.