JPH0346488Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a winding material for a drum core, and particularly to a winding structure of a chiyoke coil for preventing induced noise in a telephone line.

Medium-wave electromagnetic waves combine with telephones or terminal equipment connected to the telephone line drop-in line, generating common mode noise like interference voltage between the signal line and the ground.
This can often cause equipment to malfunction and cause communication problems.

In order to attenuate these disturbance voltages, a Chi-Yoke coil is inserted into the telephone circuit, but since the Chi-Yoke coil using a drum core is a magnetically open magnetic path, its effective magnetic permeability is low and it can be made in any shape and large. In order to obtain inductance, it is necessary to increase the number of wires in the winding, and as a result, the DC resistance increases due to the length of the winding.Furthermore, due to the stray capacitance between the windings, the value of Q changes at a certain frequency. It has the disadvantage of causing high frequency resonance.

The purpose of the present invention is to eliminate such drawbacks of the conventional method, to increase the effective permeability by bringing the magnetic circuit closer to a closed magnetic circuit by winding it in the annular groove of the drum core, and to reduce the DC resistance by reducing the number of turns of the winding. It is an object of the present invention to provide a chiyoke coil using a winding material for a drum core, which reduces the value of the coil Q, suppresses frequency resonance as much as possible, and prevents noise from entering.

According to the present invention, a winding material made of a magnetic material made of a high magnetic permeability material, a conductive material, and an insulating coating covering these is wound in the groove of a drum core having an annular groove formed on the outer periphery. The magnetic body is made of a magnetic strip-like body having a width slightly smaller than the width dimension of the groove,
The conductor is adhered in a strip shape to one surface of the magnetic strip, the insulating film covers all or part of the outer surfaces of the magnetic strip and the conductor, and the winding material has a surface that is A chiyoke coil using a drum core winding material characterized in that it is wound along the bottom surface of the groove is obtained.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows a sectional view of a chiyoke coil according to the present invention. The figure shows a chiyoke coil in which the winding material shown in FIG. 2 is wound around the grooves of a two-flange drum-shaped core 1 having an annular groove formed on the outer periphery. The winding material shown in the figure is made of a magnetic material such as permalloy or amorphous magnetic material, as shown in FIG.
A conductor 5 is bonded to one surface of a magnetic strip 3 having a width slightly smaller than the width W of the groove by, for example, vapor deposition or plating, and the outer surface thereof is covered with an insulating coating 2. Since the winding material has such a structure, when this winding material is wound many times around the groove of the core 1 with the conductor film 5 inside, the magnetic strip 3 will be caused by the flow of magnetic flux 4 shown in Fig. 1. A closed magnetic path is constructed for each winding layer. Therefore, the effective magnetic permeability is increased, and the number of turns required is smaller than that required to obtain the same inductance using the same core using the conventional method, and the Q value of the coil with reduced DC resistance can be reduced. For convenience, FIG. 1 shows a cross-sectional view when the winding material shown in FIG. 2 is wound three times, but in reality it is often wound several tens of times.

FIG. 3 shows another embodiment of the chiyoke coil according to the present invention, and the difference from FIG. 2 is a cross-sectional view of the winding material with the outer surface of the conductor 5 of the insulating coating 2 omitted; the outer surface is not insulated. However, insulation from the winding material of the adjacent layer is ensured, and the number of turns can be increased due to the smaller thickness, and the lead wire can be connected to the conductor 5.
It has the advantage of being easy to connect.

FIG. 4 shows still another embodiment of the chiyoke coil according to the present invention, in which two conductors 5 and 5' having the same width are stacked on a magnetic strip 3 with an insulator 6 in between. , is a bifilar winding material.

Amorphous amorphous layer thickness 20μm and copper thickness 10μm according to this invention
m, 44 turns of winding material with laminate thickness of 30 μm and width of 10 mm, and conventional example with shaft diameter of 4.6 mm.
The frequency characteristics of the impedance of a ferrite drum core with a flange outer diameter of 14 mm, a groove width W of 10.5 mm, and a flange thickness of 3.25 mm are wound with 44 turns of a winding material made of 0.24φUEW polyurethane copper wire as a conductor. As shown in the figure. The winding material of the present invention has an impedance that is approximately 0.5 times larger at 1 MHz than when polyurethane copper wire is used, a resonant frequency that is shifted to the high frequency side of 5 MHz, and a Q value that is clearly smaller than the figure.

To obtain the same impedance with polyurethane copper wire, the number of turns must be increased by approximately 1.4 times, and unless the wire diameter is increased, the DC resistance will increase.

As explained above, when the winding material of the present invention is used in a drum-shaped core, a closed magnetic path is formed in each winding layer, increasing the effective magnetic permeability, and even if the number of windings is reduced, the required impedance is maintained. is obtained, the direct current resistance is reduced, and the Q of the coil is reduced, making it possible to obtain a noise prevention coil with good frequency characteristics.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of a chiyoke coil using the drum winding material according to the present invention. Figures 2 to 4
The figure shows a cross-sectional view of the winding material used in the present invention. FIG. 5 shows the frequency characteristics of the conventional Chiyoke coil shown by a solid line and the Chiyoke coil according to the present invention shown by a dotted line. In the figure, 1...drum-shaped core, 2...insulating coating, 3...magnetic strip, 4...flow of magnetic flux, 5
...Strip conductor, 6...Insulator, 7...Drum core groove.

Claims (1)

[Claims for Utility Model Registration] A winding material formed of a magnetic material made of a high magnetic permeability material, a conductive material, and an insulating coating covering these is placed in the groove of a drum core having an annular groove formed on the outer periphery. In a wound coil, the magnetic body is made of a magnetic strip having a width slightly smaller than the width of the groove, the conductor is bonded in a strip shape to one surface of the magnetic strip, and the conductor is bonded to one surface of the magnetic strip, The drum core winding is characterized in that the coating covers all or part of the outer surfaces of the magnetic strip and the conductor, and the winding material has a surface wound along the bottom surface of the groove. Chiyoke coil using wire rod.