JPH10223461A - Inductance element and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the winding space factor inside the winding groove of a coil winding part by a method wherein a coil is wound such that a winding is wound inside the winding groove of the coil winding part so as to be multilayered and that both ends of the winding are situated on the outermost circumference and both ends of the winding are connected to drawing terminals from the winding groove. SOLUTION: First, the central part of a winding 16 is brought into contact with the central part of a spool 12 at a coil winding part 11. Then, the winding 16 is wound such that the side of one end 16A and the side of the other end 16B are situated in respectively opposite directions, and a first-layer coil is formed on the bobbin 12. Then, the side of one end 16A and the side of the other end 16B are directed respectively to the central part of the bobbin 12 at the coil winding part 11 so as to be wound on a winding as the first-layer coil, and a second-layer coil is formed. In addition, one end 16A and the other end 16B are turned down in the central part of the bobbin 12 in which both come into contact in such a way that they are wound on the second- layer winding, and a third-layer coil is formed. Then, one end 16A and the other end 16B at the winding 16 which is situated on the third-layer coil are drawn from a winding groove 15, and they are connected respectively to metal terminals 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance element used for a DC / DC converter circuit, a power supply circuit, and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional inductance element, and FIG. 5 is a side view of the conventional inductance element during manufacture. In the conventional inductance element, a metal plate terminal 47 is fixed to the bottom surface of the drum-shaped core 41. The drum-shaped core 41 is provided with flanges 43 and 44 at both ends of a shaft 42 so as to form a winding groove 4.
5 are formed. In this winding groove 45, a winding 46 is wound in multiple layers to form a coil. Both ends of the winding 46 are connected to metal plate terminals 47, respectively. As shown in FIG. 5, after connecting one end of a winding 46 to a metal plate terminal 47, a flange of the drum core 41 is attached to this inductance element. It is guided along the axis 44 to the axis 42, and is wound in the winding groove 45 in multiple layers. Then, the other end of the winding 46 is connected to the metal plate terminal 47.

[0003]

In such an inductance element, the winding start side of the winding 46 is a drum-shaped core 41.
The winding 46 is wound in multiple layers in the winding groove 45 along the flange 44 of the winding 46.
The number of windings for the second and subsequent layers is reduced by this amount. Therefore, in the conventional inductance element, since the space factor of the winding in the winding groove 45 is low, there is a problem that the inductance value decreases and the DC resistance value increases. Further, such an inductance element, when winding the winding 46 in the winding groove 45,
Since the second layer of the winding 46 is wound on the winding start side of the winding 46, winding disorder occurs. Therefore, there is a problem that the inductance value of the inductance element tends to vary. In recent years, it has been strongly desired to reduce the size of this kind of inductance element. Under such circumstances, when the width of the winding groove 45 of the drum-shaped core 41, that is, the interval between the flanges 43 and 44 is reduced in order to reduce the shape, the shape is reduced, and the DC resistance value is reduced. When the diameter of the winding 46 wound around the winding groove 45 of the drum-shaped core 41 is increased in order to achieve the above, these problems are remarkable, and the predetermined characteristics cannot be obtained.

An object of the present invention is to provide an inductance element capable of increasing a space factor of a winding in a winding groove of a drum type core, obtaining a predetermined inductance value even when downsized, and reducing a DC resistance value. It is an object of the present invention to provide a manufacturing method thereof. Another object of the present invention is to provide an inductance element capable of eliminating variations in the inductance value of the inductance element due to turbulence and a method for manufacturing the same.

[0005]

An inductance element according to the present invention comprises a coil winding portion having a winding shaft provided with a flange and a winding groove, a coil wound around the winding groove of the coil winding portion, and a coil. The coil is wound in such a manner that the winding is wound in a multilayer in the winding groove of the coil winding portion and both ends of the winding are located at the outermost periphery, and both ends of the winding are wound in the winding groove. And is connected to the terminal. The coil winding portion is formed by a drum-shaped core made of ferrite or a bobbin made of resin. The method for manufacturing an inductance element according to the first aspect of the present invention includes a first step of bringing a part of a winding having a predetermined length into contact with a winding shaft of a coil winding part in which a winding groove is formed by providing a flange on the winding shaft. The second step in which the winding is wound in multiple layers such that both ends of the winding are rotated in opposite directions, and both ends are at the outermost periphery, and both ends of the winding are wound from the winding groove of the coil winding part. A third step of drawing out and connecting to the terminal is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The inductance element of the present invention
The winding is wound in multiple layers around the winding shaft of the coil winding portion in which a winding groove is formed by providing a flange on the winding shaft such that both ends of the winding are located at the outermost periphery of the winding. This winding does not have one end drawn out from the innermost circumference of the winding as in the conventional inductance element, and both ends are drawn out of the winding groove of the coil winding part from the outermost circumference of the winding and the terminals Connected to. The inductance element of the present invention is manufactured as follows. First, an intermediate portion of a winding having a predetermined length is brought into contact with a winding shaft of a coil winding portion in which a winding groove is formed by providing a flange on the winding shaft. Next, this winding rotates both sides of the winding in contact with the winding shaft of the coil winding part in opposite directions, and the winding of the second and subsequent layers is not wound on the winding on one end side, The both ends are wound in a multilayer in the winding groove so as to come to the outermost periphery. Further, both ends of the winding are pulled out from the winding groove of the coil winding portion and connected to terminals.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an inductance element according to the present invention will be described below with reference to FIGS. FIG. 1 is a side view of an embodiment of the inductance element of the present invention, and FIG. 2 is a perspective view of the embodiment of the inductance element of the present invention during manufacture. 1 and 2, reference numeral 11 denotes a coil winding portion;
16 is a winding. The coil winding part 11 is formed by sintering magnetic powder, and uses a so-called drum core in which circular plate-shaped flanges 13 and 14 are provided at both ends of a cylindrical winding shaft 12. A winding groove 15 is formed between the flanges 13 and 14. In the coil winding portion 11, a winding 16 is wound around the winding groove 15 as described later. The winding 16 has one end 16A and the other end 1
6B is wound in the winding groove 15 so as to come to the third layer of the winding wound in three layers. One end 16A and the other end 16B of the winding 16 are connected to metal plate terminals 17 attached to the end face of the coil winding part 11, respectively.

[0008] Such an inductance element is manufactured by the following method. First, the coil winding part 11 is fixed to a winding machine (not shown), and the coil winding part 11 is fixed.
The center of the winding 16 is brought into contact with the center of the winding shaft 12. The winding 16 has one end 16A and the other end 16B wound in opposite directions. That is, the one end 16A is rotated in the direction of the solid line arrow A and wound on the winding shaft 12 toward the flange 14 (the direction of the dotted line arrow C).
The first layer of the coil is formed by rotating the side in the direction of the solid arrow B and winding it on the winding shaft 12 toward the flange 13 (the direction of the dotted arrow D). The one end 16A side and the other end 16B side are respectively connected to the winding shaft 12 of the coil winding portion 11.
The second layer of the coil is formed by winding over the first layer winding toward the center of the coil. Furthermore, this one end 16A
Side and the other end 16B side are in contact with each other.
The third layer of the coil is formed by folding at the center of the winding shaft 12 and winding it on the winding of the second layer. Then, one end 16A and the other end 16B of the winding 16 located on the third layer of the coil are pulled out from the winding groove 15 and connected to the metal plate terminals 17, respectively.

FIG. 3 is a side view of another embodiment of the inductance element of the present invention. In FIG. 3, reference numeral 31 denotes a coil winding portion, and reference numeral 36 denotes a winding. The coil winding part 31 is formed using a resin, and a circular plate-shaped flange 3 is provided at both ends of a cylindrical winding shaft.
The winding groove 35 is formed by providing 3 and 34. A pin-shaped terminal 37 is implanted in the collar 34. This coil winding part 31
The winding 36 is wound into two layers in the winding groove 35, and one end 36A and the other end 36B of the winding 36 located in the middle of the second layer of the winding.
Is drawn out of the winding groove 35. One end 36A and the other end 36B of the winding 36 drawn out from the winding groove 35 are connected to predetermined pin-shaped terminals 37, respectively.

Although the embodiments of the inductance element and the method of manufacturing the same according to the present invention have been described above, the present invention is not limited to these embodiments. For example, one end and the other end may be simultaneously wound in opposite directions by contacting a middle part of the winding with the center of the winding shaft of the coil winding part. In addition, one end side and the other end side may be wound simultaneously in opposite directions by contacting an intermediate portion of the winding with a position biased to one flange side of the winding axis of the coil winding portion. Further, a metal plate terminal or a pin terminal may be provided on the base, and the coil winding portion may be fixed to the base. In this case, the coil may be fixed to the base after the coil is wound, or the coil may be fixed to the base after the coil is fixed to the base.

[0011]

As described above, according to the inductance element of the present invention, the winding is wound in multiple layers in the winding groove of the coil winding portion, and wound so as to be positioned at the outermost periphery of the winding. Are drawn out from the inside of the winding groove and connected to the terminals, so that the space factor of the winding in the winding groove of the coil winding part can be made higher than that of the conventional one. The space factor of the winding in the inductance element of the present invention differs depending on the width of the winding groove of the coil winding part and the diameter of the winding. When the winding is wound by the same number of layers in the winding groove using a wire, for example, assuming that the width of the winding groove of the coil winding portion is 1 mm and the diameter of the winding is 0.25 mm, Can be improved by 25%. Therefore, in the inductance element of the present invention, the inductance value can be made larger than that of the related art by the improvement in the winding space factor (1.5 times the conventional inductance value in the above-described case). It is possible to reduce the width of the winding groove of the portion to make it smaller than before, and to use a winding having a larger diameter to reduce the DC resistance value as compared with the conventional one. Further, according to the method for manufacturing an inductance element of the present invention, a part of the winding having a predetermined length is brought into contact with the winding shaft of the coil winding portion in which the winding groove is formed by providing a flange on the winding shaft. After that, the winding is wound in multiple layers so that both sides of the winding are rotated in opposite directions, and both ends are at the outermost circumference, so the winding disturbance when winding the winding in the winding groove Can be prevented. Therefore, it is possible to eliminate the variation in the inductance value of the inductance element due to the winding disturbance.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the inductance element of the present invention.

FIG. 2 is a perspective view of the inductance element according to the embodiment of the present invention during manufacture.

FIG. 3 is a side view of another embodiment of the inductance element of the present invention.

FIG. 4 is a sectional view of a conventional inductance element.

FIG. 5 is a side view of a conventional inductance element in the process of being manufactured.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Coil winding part 12 Winding shaft 13 Flange 14 Flange 15 Winding groove 16 Winding 17 Terminal

Claims (4)

[Claims] A coil wound portion having a winding groove formed by providing a flange on a winding shaft; a coil wound around a winding groove of the coil winding portion;
A terminal to which the coil is connected, wherein the coil is wound in such a manner that windings are formed in a multilayer in a winding groove of the coil winding portion and both ends of the winding are located at the outermost periphery;
An inductance element wherein both ends of the winding are drawn out of the winding groove and connected to terminals. 2. The inductance element according to claim 1, wherein the coil winding section is a drum-shaped core made of ferrite. 3. The inductance element according to claim 1, wherein the coil winding section is a bobbin made of a resin. 4. A first step of bringing an intermediate portion of a winding having a predetermined length into contact with a winding shaft of a coil winding portion in which a winding groove is formed by providing a flange on the winding shaft, A second step in which the winding is wound in multiple layers such that both ends of the winding are rotated in opposite directions so that both ends are at the outermost periphery, and both ends of the winding are pulled out from the winding grooves of the coil winding portion. A method of manufacturing an inductance element, comprising: a third step of connecting to a terminal.