JPH04329606A - Winding type coil - Google Patents

Abstract

PURPOSE:To make a capacity of a winding type coil increase and make its size and characteristic deviation decrease, by forming its winding body part in the form of a cylinder, and by providing on the cylindrical surface, a plurality of protruded streaks, each having an obtuse ridge part, in the cylinder axis direction. CONSTITUTION:On the cylindrical surface of a winding body part 3 of a drum core 2, two protruded streaks 7a, 7a, whose ridge parts form obtuse angles respectively, are provided in its axis direction. The ridge part of the protruded streak 7a is made obtuse, because if it forms an acute angle, then a winding space is made large in the same way as the winding body of a square pillar. When a winding 6 is wound around the winding body part 3, the winding 6 in a first layer 5a is wound uniformly on the cylindrical surface of the winding body part 3. Then, even if a second layer 5b is formed, the winding 6 in the first layer 5a can be wound in an aligning way, since it is stopped from sliding by virtue of the ridge part of the protruded streak 7a. Further, in the layers on and after a third layer 5c, since the winding 6 is not slid by virtue of the aligned windings continuing from the first layer 5a, the aligned windings are made possible extensively. Thereby, the size of the winding type coil can be reduced, and its capacity and reliability can be increased together with no swelled winding.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-wound coil that suppresses swelling of the winding trunk and is miniaturized.

0002

2. Description of the Related Art In a normal wire-wound coil, a pair of flanges 104, 104 are provided at both ends of a winding body 103 of a drum core 102, as shown in FIG.
A winding 106 is wound around the winding trunk 103 between the windings 104 to form a winding part 105 to obtain inductance. The cross-sectional shape of the drum section 103 of the drum core 102 is usually cylindrical rather than square. The first reason is that the first layer of the winding has better contact between the core and the wire. In the case of a rectangular cylindrical winding drum, a space is formed between the winding drum and the winding part, and magnetic flux leaks from this space, reducing inductance. Since a larger number of turns is required to achieve the desired inductance, the coil cannot be made smaller. The second reason is that tension can be applied uniformly to the wire during winding. If the shape is square, the winding and the winding body will only come into contact with each other at the corners, so stress will be applied only to that part, and if a large tension is applied, there is a risk of the wire breaking, and since the tension cannot be increased, the winding will swell and become loose. arise,
It cannot be made smaller.

0003

However, in the drum core 102 having the cylindrical winding body 103, the winding 106
When there are two or more layers, the tension of the wire 106 of the second layer 105b causes the wire 106 of the first layer 105a to
Slippage occurs, and the lines of the second layer dig into the spaces between the lines of the first layer. As a result, the third layer 105c and subsequent layers do not have aligned windings, and as shown in FIG.
There are problems in that uneven winding occurs as shown in b), and winding swell occurs in the winding portion 105 as shown in FIG. 5(a). Therefore, the dimensions of the drum core must be designed to be larger in consideration of this winding expansion, which has been a major hindrance in reducing the size of the coil.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a highly reliable wire-wound coil that achieves larger capacity, smaller size, and narrower deviation.

[0005]

[Means for Solving the Problem] In order to achieve the above object, a wire-wound coil according to the first invention of the present application has a winding coil wound around a drum core having a pair of flanges at both ends of the drum core. The wound wire-wound coil is characterized in that the winding trunk is formed into a cylindrical shape, and a plurality of obtuse-angled protrusions are provided on the circumferential surface of the coil along the axial direction. In addition, the second application
The wire-wound coil according to the invention is characterized in that the winding trunk has a polygonal shape of at least pentagon or more.

[0006]

[Function] Since the first invention of the present application is constructed as described above, the first layer of the winding portion is fixed by a plurality of obtuse-angled protrusions to prevent slipping, even if the winding wire is not wound with a large tension. The circumferential surface other than the protrusions also makes good contact with the winding drum, and the tension acts uniformly. Tension acts evenly on the second and subsequent layers, and the wires of the previous first layer do not slip, so there is no digging between these wires, resulting in aligned winding.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a diagram showing a first embodiment of the first invention of a wire-wound coil according to the invention. In the figure, 1 is a wire-wound coil, 2 is a drum core, and 5 is a winding portion. A drum core 3 is formed in the center of the drum core 2, and flanges 4 are provided at both ends of the drum core 3 in the axial direction. The winding part 5 is formed by winding a winding 6 around the winding trunk part 3.

In this embodiment, the drum core 3 of the drum core 2 has an obtuse tip formed along the circumference of the drum core 3 in the axial direction, as shown in FIGS. 1(b) and 1(c). protrusions 7a, 7a
There are two articles. This is because if the tip of the protrusion 7a is made at an acute angle, the space will become larger as in the case of a conventional rectangular prism winding drum. When the winding 6 is wound around the winding trunk 3, the winding 6 of the first layer 5a is wound uniformly around the circumferential surface of the winding trunk 3, as shown in FIG. 1(d). Next, even when the second layer 5b is formed, the winding 6 of the first layer 5a is stopped at the tip of the protrusion 7a and can be wound in an aligned manner as shown in the figure without slipping. Further, even in the layers after the third layer 5c, aligned winding is performed from the first layer 5a, so that the winding 6 does not slip, so that aligned winding can be performed as a whole as shown in the figure.

According to this embodiment, the winding 6 can be fixed by the plurality of protrusions 7a, 7a provided on the circumferential surface of the winding trunk 3 to prevent it from slipping, even if it is not wound with a large tension. . Moreover, since the winding drum 3 has a circular cross section and the protrusions 7a, 7a are formed at an obtuse angle, the winding 6 is in good contact along the circumferential surface of the winding drum 3, with almost no space being formed. Therefore, there is no bulging, and the capacity can be increased and the size can be reduced, and reliability can be improved.

FIG. 2 is a diagram showing a drum core according to a second embodiment of the first invention. In the figure, 12 is a drum core,
A winding drum section 13 is formed in the center of this drum core 12,
Flanges 14, 14 are provided at both ends of the winding drum 13 in the axial direction.

[0011] The winding drum 13 of this embodiment has protrusions 17a formed at an obtuse angle by changing the number of protrusions 17a formed along the axial direction.
, 17b are provided. In the cross section along A-A in Fig. 2(a), two protrusions 17a, 17a are provided, and in the cross section along B-B, three protrusions 17b, 17b, 17b are provided. The number and shape of the protrusions may be changed depending on the position of the winding drum, or two or more protrusions may be provided in a spiral shape. The rest is the same as the first embodiment.

FIG. 3 is a diagram showing a drum core according to a third embodiment of the first invention. In the figure, 22 is a drum core,
A winding drum section 23 is formed in the center of this drum core 22,
Flanges 24, 24 are provided at both ends of the winding drum section 23 in the axial direction. In this embodiment, the tip of the obtuse-angled protrusion 27a provided on the winding drum 23 is chamfered to form a round shape. The rest is the same as the above embodiment.

FIG. 4 is a diagram showing an embodiment of a wire-wound coil according to the second invention. In the figure, 31 is a wire-wound coil;
32 is a drum core, and 35 is a winding portion. drum core 3
A winding drum section 33 is formed in the center of the winding drum section 2, and flanges 34, 34 are provided at both ends of the winding drum section 33 in the axial direction. The winding drum section 33 is formed in a pentagonal shape, and the winding section 35 is formed in a pentagonal shape.
A winding 36 is wound around the wire 3. In this embodiment, as shown in FIG. 4(b), the sides of the winding trunk 33 and the winding 3
A space 38 is formed between 6, but by increasing the number of corners, forming roundness on the sides, and increasing the roundness of the corners, the space can be significantly reduced, which is completely different from the case of a square prism. A large value of inductance similar to that of the first invention can be obtained. The rest is the same as the first invention.

[0014]

As described above, according to the wire-wound coil according to the present invention, the space between the winding body and the winding can be reduced without having to wind the winding with a large tension, and the winding can be prevented from swollen. Therefore, it is possible to increase the capacity, reduce the size, and improve reliability.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating a wire-wound coil according to the first invention, (
(a) is a longitudinal cross-sectional view of the first embodiment, (b) and (c) are cross-sectional views of the winding drum, and (d) is an enlarged cross-sectional view of the winding portion.

FIG. 2 is a diagram illustrating the drum core of the second embodiment, in which (a) is a vertical cross-sectional view of the drum core, and (b) and (c) are respectively (a).
) is a cross-sectional view of the winding drum section along lines A-A and B-B.

FIG. 3 is a diagram illustrating the winding drum of the third embodiment, in which (a) is a longitudinal cross-sectional view of the drum core, and (b) is a cross-sectional view of the winding drum.

FIG. 4 is a diagram illustrating a wire-wound coil according to the second invention,
(a) is a longitudinal sectional view, and (b) is an enlarged cross-sectional view of the winding drum.

FIG. 5 is a diagram illustrating a conventional example, in which (a) is a longitudinal cross-sectional view;
b) is an enlarged sectional view of the winding part.

[Explanation of symbols]

1, 31 Wire-wound coil 2, 12, 22, 32, 102 Drum core 3,
13, 23, 33, 103 Winding trunk section 4, 14, 2
4, 34, 104 Flange 5, 35, 105
Winding section 6, 36, 106 Winding wire

Claims (2)

[Claims] 1. A wire-wound coil in which a winding is wound around a drum core provided with a pair of flanges at both ends of the drum core, wherein the winding drum is formed into a cylindrical shape, and the winding drum has a circular shape. A wire-wound coil characterized in that a plurality of obtuse-angled protrusions are provided along the axial direction on the circumferential surface. 2. A wire-wound coil according to claim 1, wherein the winding body of the wire-wound coil has a polygonal column shape of at least pentagon or more.