JPH0750657B2 - Micro wire inductance element - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin wire core and an inductance element using a thin wire exciting conductor, and particularly to a high frequency,
The present invention relates to a micro wire inductance element having an optimized magnetic core and exciting conductor for micronization.

[0002]

2. Description of the Related Art In an inductance element using a conventional amorphous wire magnetic core, since the amorphous wire is manufactured by a spinning fiber method and thinned with a die, the diameter of the amorphous wire is 10 μm or more. there were. When these wires are bundled to form a magnetic core, iron loss increases in the high frequency region, and it has been considered that the operating frequency of the inductance element using the amorphous wire is up to about 10 KHz. Thick amorphous wire (diameter 1
(0 μm or more) is used as a bundle, it is necessary to use a thick conductor wire with a diameter of 50 to 100 μm as the exciting conductor due to the relation of tension when the coil is automatically wound. Was inevitably large and there was a limit to miniaturization. Further, the use of a thick exciting conductor causes an increase in copper loss in the high frequency region due to the skin effect, and Q is not improved, making it impossible to use up to a high frequency. An inductor will be described as an example of the inductance element in detail. For example, IEEE Trans. o
n Mag. As disclosed in MAG-22 415 (1986), amorphous wire 1 as shown in FIG.
Fig. 5 shows the inductance and Q frequency characteristics when a woven structure inductor having a parallel line as the parallel line and the exciting conductor 2 as the parallel line uses 32 amorphous wires having a diameter of 20 µm as parallel lines and an exciting conductor having a diameter of 70 µm as the parallel line. .
As can be seen from FIG. 5, the frequency showing the maximum value of Q is about 1 MHz. The width of this element is 7 mm, and the length l
= 5 mm, which is large. When such a thick amorphous wire and exciting conductor are used, the usable frequency is limited to 1 to 2 MHz, and the surface area of the element becomes large.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a micro wire inductance element capable of optimizing a magnetic core and an exciting conductor for increasing the operating frequency and miniaturization. The purpose is to

[0004]

In order to solve the above-mentioned problems, the present invention provides a microwire inductance element having a structure in which an exciting conductive wire coated with an insulating film is wound around a thin wire core, and the diameter of the thin wire core is 1 μm or more and 10 μm or less. age,
One or many are bundled to form a magnetic core. In addition, the magnetic core formed by bundling a large number of wires is the latitude line, and the diameter of the exciting conductor is
A woven fabric structure is formed by using one or a large number of bundled exciting conductor groups having a size of 5 μm or more and 15 μm or less as a meridian.

[0005]

With the above-mentioned means, it is possible to realize an inductance element having a high Q and a high frequency by twisting the conductors in the skin effect and using them as an exciting conductor. Further, by using an ultrafine wire for the magnetic core, iron loss can be reduced and higher frequency can be achieved.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In the embodiment of the present invention, considering the skin effect in the high frequency region of 100 MHz or more, the diameter of the exciting conductor is 1 mm.
Chemical etching (Japanese Patent Application No. Hei 1-198)
389) or an amorphous ultrafine wire having a diameter of 10 μm or less produced by drawing to form a magnetic core, and the excitation conductor is wound around the magnetic core of one or more groups in a toroidal shape or a woven structure to reduce iron loss. A high frequency micro wire inductance element is obtained. Example 1

In FIG. 3, the dotted line shows the measurement result of an embodiment of the inductor using the thin wire excitation conductor group and the thin wire amorphous wire group. The exciting conductor is an effective copper wire having a diameter of 50 μm3 and covered with an insulating film. The magnetic core has a frequency characteristic of the inductance and Q of an inductor knitted into a woven structure using 15 groups by bundling 100 amorphous wires each having a diameter of 10 μm. As can be seen from the comparison with FIG. 5, it is possible to increase the frequency by thinning the magnetic core. Example 2

In FIG. 3, the solid line represents the measurement result of the embodiment of the inductor using the ultrafine wire exciting conductor group and the ultrafine wire amorphous wire group. The exciting conductor is an effective copper wire having a diameter of 10 μm3 covered with an insulating film. The magnetic core has a frequency characteristic of inductance and Q of an inductor knitted into a woven structure by using 100 groups of 100 amorphous wires bundled with a diameter of about 5 μm. By making both the copper wire group and the magnetic core group extremely thin, higher frequency and higher Q can be realized. Also, the element size is 1 × 2 mm ² As compared with FIG. 5, the surface area is as small as 10% or less, and microfabrication is possible. Example 3

FIG. 1 shows a schematic view of an embodiment in which an ultrafine wire amorphous wire having a relatively high magnetic permeability is used. Extra-fine wire A group of ultra-fine wire cores 1
In this inductor, a ring-shaped extra fine wire magnetic core group 11 is wound with a toroidal extra fine wire exciting conductor group 12 in which three exciting conductors are covered with an insulating film and bundled. It is to be noted that a transformer of 1: 1 is obtained by using two of the above-mentioned exciting conductor groups 12 in this ultrafine wire core group 11 and winding them alternately or separately. Example 4

FIG. 2 (a) shows a schematic view of an embodiment in which an ultrafine wire group having a low magnetic permeability is used. This is an inductor in which a group of extra-fine wire magnetic cores 21 and a group of extra-fine wire excitation conductors 22 in which each exciting conductor is covered with an insulating film are wound in a toroidal shape. Unlike the case of the third embodiment, since the magnetic permeability is low, the effect of the demagnetizing field does not appear so much even if a single rod type magnetic core with both ends is used, and since the ultrafine wire magnetic core is used, the demagnetizing field of each wire magnetic core is used. The coefficient is small and has the same effect as when the ring-shaped magnetic core is used. FIG. 2B shows an embodiment of an inductor element in which the above inductors are connected in series.

As described above, when a thick conductive wire (diameter of several tens of μm or more) is used as the exciting conductor, it cannot be expected to be used as an inductance element at 10 MHz or more due to the skin effect. On the other hand, even if a thin excitation conductor with a diameter within the skin effect is used, the DC resistance will increase, and an increase in Q cannot be expected. However, by using the conductor within the skin effect as an exciting conductor wire, the Q is high and the frequency becomes higher. Inducted elements are possible. Further, by using an ultrafine wire for the magnetic core, iron loss can be reduced and higher frequency can be achieved. From the above, it is very effective to use the ultrafine wire magnetic core group and the ultrafine wire excitation conductor group for achieving high frequency and microminiaturization.

[0013]

As described above, according to the present invention, by using the ultrafine wire excitation conductor group and the ultrafine wire magnetic core group, copper loss and iron loss in the high frequency region are reduced, and the inductance element is increased in frequency. There is an advantage that high Q can be achieved.

[Brief description of drawings]

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

FIG. 2 is a schematic perspective view showing another embodiment of the present invention.

FIG. 3 is a characteristic diagram showing measurement results of an example of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional woven structure inductor.

FIG. 5 is a characteristic diagram showing measurement results of a conventional woven structure inductor.

[Explanation of symbols]

11, 21 ... Extra-fine wire core group, 12, 22 ... Extra-fine wire excitation conductor group.

Claims (2)

[Claims] 1. A micro wire inductance element having a structure in which an exciting wire covered with an insulating film is wound around a thin wire core, wherein the diameter of the thin wire core is 1 μm or more and 10 μm or less, and one or a large number of them are bundled to form a magnetic core. Characteristic micro wire inductance element. 2. The weaving structure is characterized in that a magnetic core formed by bundling a large number of wires is a latitude line, a diameter of an exciting conductor is set to 5 μm or more and 15 μm or less, and one or a large number of exciting conductor groups are formed as a meridian. 1. The micro wire inductance element according to 1.