JP2011258608A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component which can securely perform filling in a space between a soft magnetic body and a metal mold or a magnetic gap of a soft magnetic body even in the case that the space or the gap are narrow, and which can precisely control high magnetic characteristic while reliably securing insulation quality.SOLUTION: A coil component comprises a magnetic core 3 constituting a closed magnetic circuit, and a coil winding circularly placed in a magnetic path of the magnetic core 3. The magnetic core 3 includes a soft magnetic body 1 having electric conductivity, and a composite magnetic body 2 containing magnetic powder and thermoplastic resin covering a surface of the soft magnetic body. The composite magnetic body 2 is configured to have a higher volume resistivity than the soft magnetic body 1.

Description

  The present invention relates to a wire ring component used in a rectifier circuit, a noise prevention circuit, a resonance circuit, a power conversion circuit, and the like in various AC devices.

  Patent Document 1 provides a structure of a magnetic insulating coated wire ring that suppresses a coating leakage magnetic flux current by molding a magnetic flux blocker containing ferromagnetic powder on the outside of the wire ring part by transfer or the like.

  Further, Patent Document 2 has a configuration in which a C-shaped core having a magnetic gap portion is formed, and further, molding is performed using a resin as a material so as to fill the magnetic gap portion and simultaneously cover the C-shaped core surface. It is disclosed.

  Patent Document 3 discloses a configuration in which an adhesive in which metal magnetic powder is dispersed is arranged in a magnetic gap.

Utility Model Registration No. 3037638 JP 2002-93627 A JP 2009-117676 A

  In the prior art, a composite magnetic material in which a resin and magnetic powder are mixed is used in order to improve the so-called DC superposition characteristic, in which an inductance is maintained when a DC current is superimposed on an inductance value or an energization current. On the other hand, wire ring parts represented by inductors and reactors are required to be small and highly functional, and the resin coating on the surface of the magnetic core is required to be thin, and the magnetic gap provided in the magnetic core is becoming narrower. ing.

  Therefore, in the prior art, a thermosetting resin is used as the resin of the composite magnetic body. However, since a large amount of magnetic powder is added to the composite magnetic body, the fluidity at the time of molding is reduced, and the magnetic core and the mold are It may harden in the middle of filling the gap and magnetic gap of the magnetic core, and if the filling is insufficient, there is a problem that insulation failure may occur or desired magnetic characteristics may not be obtained. .

  The above-described problem includes a magnetic core that forms a closed magnetic path and a winding that circulates around the magnetic path of the magnetic core, and the magnetic core includes a conductive soft magnetic body and a heat that covers a surface of the soft magnetic body. A wire ring component comprising a composite magnetic body including a plastic resin and magnetic powder, wherein the composite magnetic body has a volume resistivity higher than that of the soft magnetic body can be solved.

  The surface of the conductive soft magnetic material needs to be coated with a composite magnetic material having an electric resistance higher than that of the soft magnetic material in order to ensure insulation from the winding and at the same time obtain high magnetic properties. The present invention eliminates curing during molding as in the prior art, so that the surface can be reliably covered with the composite magnetic material and the insulation between the winding and the magnetic core can be ensured. When magnetic permeability is required for the magnetic powder, soft magnetic powder is used. When magnetization is required, hard magnetic powder, that is, magnet powder is used.

  Further, according to the present invention, a magnetic gap can be provided in the soft magnetic material for inductance adjustment, and the magnetic gap can be reliably filled with the composite magnetic material.

Further, depending on the function required for the composite magnetic body, ferrite powder may be used as the magnetic powder of the present invention. In this case, if the ferrite powder is contained in an amount of 60% by volume or less (excluding 0) with respect to the composite magnetic material, the volume resistivity is 1 × 10 ⁹ Ω · cm or more, and sufficient insulation properties are obtained. be able to. In addition, the content of the magnetic powder of the present invention with respect to the composite magnetic material is 70% by volume or less (however, 0 is not included), and the magnetic powder has a volume content of 50% or less (however, 0 is not included). Even if it is made of powder and ferrite powder having a volume content of more than 50% and less than 100%, the volume resistivity of the composite magnetic material is 1 × 10 ⁵ Ω · cm or more, so that the necessary properties for insulation are obtained. Obtainable.

  Further, at least part of the surface of the magnetic core excluding the portion facing the soft magnetic body has a lower density of magnetic powder than the inside of the composite magnetic body and the surface facing the soft magnetic body. Thus, in particular, when conductive magnetic powder is used, insulation between the composite magnetic body and the winding can be reliably ensured, which is desirable.

As the thermoplastic resin, ABS resin, PBT resin, PET resin, PPS resin, nylon 6, nylon 66, nylon 12, liquid crystal polymer, and the like can be used. In addition, D90 (particle diameter corresponding to a cumulative weight fraction of 90%) is 60 μm or less (excluding 0) in the case of a spherical or irregular powder, and eddy current loss can be generated even with an AC magnetic field of 100 kHz. This is desirable because it can avoid the influence of the resulting skin effect. In addition, when the magnetic powder is a soft metal powder and a flat powder, the demagnetizing factor can be reduced if the aspect ratio is 1/5 or more, which is desirable from the viewpoint of ensuring the magnetic permeability due to inductance. If the average thickness of the powder is 9 μm or less (excluding 0), it is desirable because the flat powder is easily arranged in the long side direction during injection molding. Further, if the molding density of the composite magnetic body is 2 g / cm ³ or more, it is possible to secure a permeability of 2 or more, and if it is 8 g / cm ³ or less, it is desirable because the fluidity for injection molding is easily secured.

  According to the present invention, it is possible to provide a wire ring component including a composite magnetic body that can be reliably filled even when the gap between the soft magnetic body and the mold or the magnetic gap of the soft magnetic body is narrow.

  Furthermore, by reliably covering the surface of the conductive soft magnetic material with the composite magnetic material, it is possible to provide a wire ring component having high magnetic properties while ensuring insulation.

  Further, since the magnetic gap provided in the conductive soft magnetic material can be reliably filled with the composite magnetic material, it is possible to provide a wire ring component in which the magnetic characteristics of the magnetic core can be precisely adjusted, that is, the characteristics can be precisely controlled.

The perspective view of the closed magnetic circuit magnetic core in the wire ring components of this invention. FIG. 1A is a perspective view showing an example composed of one soft magnetic body, and FIG. 1B is a perspective view showing an example composed of two soft magnetic bodies stacked in the height direction. The perspective view explaining the structure of the closed magnetic circuit magnetic core in the wire ring components of this invention. Sectional drawing of the a surface in the closed magnetic circuit magnetic core of FIG. Sectional drawing which shows an example of a structure of the soft-magnetic body and metal mold | die in the wire ring components of this invention. Sectional drawing which shows the other example of a structure of the soft-magnetic body and metal mold | die in the wire ring components of this invention. The perspective view of another closed magnetic circuit magnetic core in the wire ring components of this invention. Sectional drawing which shows the structure of the composite magnetic body piece and metal mold | die in the wire ring components of this invention.

  The present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a closed magnetic circuit magnetic core in a wire ring component according to the present invention. FIG. 1 (a) is a perspective view showing an example composed of one soft magnetic body, and FIG. It is a perspective view which shows an example which overlapped and comprised one in the height direction.

  In FIG. 1A, the closed magnetic circuit magnetic core 3 has the surface of the conductive soft magnetic body 1 covered with the composite magnetic body 2, and the magnetic gap 11 of the soft magnetic body 1 is also filled with the composite magnetic body 2. The windings that circulate around the magnetic path of the closed magnetic path magnetic core 3 are not shown.

  In FIG. 1A, the soft magnetic body 1 is a toroidal core provided with a magnetic gap 11, and the closed magnetic circuit magnetic core 3 is also a toroidal core. However, the present invention is not limited to this, and a closed magnetic circuit is configured. As long as this is the case, the present invention can be applied to a rectangular core, EI, EE core, or the like. Further, the present invention can be applied even if a plurality of magnetic gaps 11 may be provided or not provided.

  If the magnetic powder used for the composite magnetic body 2 is soft magnetic powder, NiZn ferrite powder, MgZn ferrite powder, MnZn ferrite powder, FeSi metal soft magnetic powder, FeSiAl metal soft magnetic powder, etc. are hard magnetic powder. Ba ferrite powder, Sr ferrite powder, NdFeB metal magnetic powder, SmCo metal magnetic powder and the like are used.

  When the composite magnetic body 2 is required to have high insulation properties, it is desirable to use an insulating ferrite powder for the magnetic powder itself. In addition, for applications such as choke coils and reactors that require high DC superposition characteristics used in booster circuits and the like, a metallic magnetic material such as FeSi having a high saturation magnetization is used as a soft magnetic powder for spherical or It is desirable to use a metal soft magnetic powder processed into a spherical particle shape. In addition, since a high magnetic permeability is required for the magnetic core of a choke coil used for a noise filter or the like, a metal magnetic material such as FeSiAl having a high magnetic permeability is used as a soft magnetic powder of the composite magnetic material 2 in a flat shape. It is desirable to use a metal soft magnetic powder having a particle shape.

  In addition, when the composite magnetic body 2 is injected, a heat conductive material powder having a high electrical insulating property such as boron nitride or graphite having a D50 (particle diameter corresponding to a cumulative weight fraction of 50%) of 2 μm or less is added to the composite magnetic body 2. Is added within a range that does not impair the fluidity of the magnetic core 3, thereby improving the heat dissipation from the inside of the magnetic core 3 and increasing the rigidity of the composite magnetic body 2, thereby softening due to the time change of the internal magnetic field of the magnetic core 3. This is desirable because noise generated from the magnetic gap portion in the magnetic material can be suppressed. Note that the noise generated from the magnetic gap portion is caused by the generation of a core exciting force due to mutual magnetic attraction acting on the magnetic bodies facing the magnetic gap portion by energizing the winding. Therefore, as shown in FIG. 1B, a plurality of soft magnetic bodies are stacked in the height direction, and the magnetic gap of the soft magnetic body 1 and another soft magnet 12 are arranged adjacent to each other in the height direction, thereby winding the winding. The magnetic attractive force due to the energization of the magnetic field is also generated between the magnetic gap portion 11 and the soft magnetic body 12 adjacent in the height direction, so that the magnetic attractive force is dispersed and noise generated from the magnetic gap portion 11 is suppressed. Is desirable. Further, the soft magnetic body 12 adjacent to the magnetic gap portion 11 in the height direction is more rigid than the composite magnetic body 2, and the noise generated from the magnetic gap portion 11 is also because the magnetic gap portion 11 is firmly fixed. Is suppressed.

  The thermoplastic resin used in the composite magnetic body 2 is preferably a crystalline resin such as polypropylene, polyethylene, polyamide, or PPS (polyphenylene sulfide resin), and is particularly nylon for applications where high magnetic properties are required, more preferably nylon 12 ( Polyamides obtained by ring-opening polycondensation of lauryl lactam) are preferred because they are compatible with magnetic powder. In addition, PPS is suitable when the ring component is mounted on a circuit board or the like by reflow.

  FIG. 2 is a diagram illustrating the configuration of a closed magnetic circuit magnetic core in the wire ring component of the present invention. As shown in FIG. 2, the magnetic gap portion of the soft magnetic body 1 is first filled with the composite magnetic body 21 using the metal soft magnetic powder as the magnetic powder, and then the surfaces of the soft magnetic body 1 and the composite magnetic body 21 are filled. It is good also as a structure which combines the high magnetic characteristic in a magnetic gap part, and the high insulation of the magnetic core 3 surface by coat | covering with the composite magnetic body 22 which used ferrite powder as soft-magnetic powder. In this case, the composite magnetic body 21 is injected from the composite magnetic body 22 by making the thermal deformation temperature of the composite magnetic body 21 filled in the magnetic gap portion higher than that of the composite magnetic body 22 covering the surface of the soft magnetic body 1. This is desirable because it can prevent mixing during molding. When a magnetic plate that is thinner than the magnetic gap width and generates a magnetic force in the thickness direction is attached in advance to the magnetic gap portion of the soft magnetic body 1 and the composite magnetic body 21 in which the magnetic powder is hard magnetic powder is filled, The direction of magnetization of the hard magnetic powder of the composite magnetic body 21 is aligned by the magnetic field generated by the magnet plate, and a high magnetic force can be applied to the magnetic core 3.

  FIG. 3 is a cross-sectional view of the a-plane in the closed magnetic circuit magnetic core of FIG. 2, and is a diagram illustrating a cross-sectional configuration of the a-plane perpendicular to the magnetic path of the closed magnetic circuit magnetic core 3. The surface of the soft magnetic body 1 is covered with a composite magnetic body 221 having a high content of soft magnetic powder, and the surface of the soft magnetic body 1 is further covered with a composite magnetic body 222 having a low content of soft magnetic powder.

  FIG. 4 is a cross-sectional view showing an example of the configuration of the soft magnetic body and the mold in the wire ring component of the present invention, and FIG. 5 is a cross section showing another example of the configuration of the soft magnetic body and the mold in the wire ring component of the present invention. FIG. In order to form the composite magnetic body shown in FIG. 3, first, a mold 41 shown in FIGS. 4 and 5 and a mold 42 serving as a lid of the mold 41 are prepared. The mold 41 is provided with pins 431 and 432 for supporting the soft magnetic body 1.

  Next, the wall surface of the sealed space formed by the mold 41 and the mold 42 is covered with an epoxy resin or polyimide having a low thermal conductivity of 0.1 mm to 0.5 mm (not shown).

  Furthermore, when the thickness of the composite magnetic body is 1 mm or more, the mold 41 and the mold 42 are kept at a temperature 30 ° C. lower than the thermal deformation temperature of the thermoplastic resin in the composite magnetic body and at a temperature of room temperature or higher. At this time, it is desirable that the soft magnetic body 1 has a temperature higher than the thermal deformation temperature of the thermoplastic resin, so that the fluidity of the composite magnetic body at the time of injection is increased. However, the soft magnetic body 1 is between the soft magnetic body 1 and the composite magnetic body. However, if it is desired to ensure insulation, the temperature may be 30 ° C. lower than the thermal deformation temperature of the thermoplastic resin and higher than room temperature.

  A composite magnetic body in which the surfaces of the mold 41 and the mold 42, which are kept at a temperature 30 ° C. lower than the thermal deformation temperature of the thermoplastic resin and kept at a temperature higher than room temperature and covered with a material having low thermal conductivity, is in a plastic state. When flowing, the thermoplastic resin in the composite magnetic body 2 comes into contact with a substance having low thermal conductivity and solidifies when cooled, but the soft magnetic powder is dragged by the flow inside the composite magnetic body and flows. Therefore, as a result, the composite magnetic body facing the mold wall surface side increases the proportion of the thermoplastic resin having high electrical insulation. Therefore, the insulation of the composite magnetic body facing the mold wall surface can be enhanced. Furthermore, since the soft magnetic powder is not exposed on the surface of the composite magnetic material facing the mold wall surface, it becomes a smooth surface, so that the stress applied to the insulating film of the winding during the winding process is kept to a minimum. Can do.

If the volume resistivity of the composite magnetic material is 1 × 10 ⁹ Ω · cm or more, it is possible to ensure sufficient insulation from the winding, and the composite magnetic material is to be coated with a thickness of 1 mm or less. The temperatures of the mold 41 and the mold 42 may be kept within a range of 30 ° C. or less with the upper limit of the thermal deformation temperature of the thermoplastic resin in the composite magnetic body.

  Next, the soft magnetic body 1 is set in the mold 41, covered with the mold 42, and the sealed space formed by the mold 41 and the mold 42 is evacuated to 0.1 atm or less. 4, the injection port 51 arranged on the outer peripheral side of the soft magnetic body 1 provided in the mold 42 so as to face the height direction of the soft magnetic body 1, or the soft magnetic body 1 as shown in FIG. 5. A composite magnetic body is ejected from an ejection port 52 arranged on the inner peripheral side so as to face the height direction of the soft magnetic body 1. Even when flat metal soft magnetic powder is used as the soft magnetic powder of the composite magnetic body, the composite magnetic body flows along the surface of the soft magnetic body 1, so that the long side of the flat metal soft magnetic powder is used. The direction is along the direction of flow, and the long side direction of the metal soft magnetic powder is along the surface of the soft magnetic body 1, so that the long side direction of the metal soft magnetic powder with high permeability and the magnetic flux on the surface of the soft magnetic body 1 are used. The majority of the parts are parallel to each other. The direction of the injection ports 51 and 52 may be inclined along the outer peripheral portion or inner peripheral portion surface of the soft magnetic body 1 from the height direction of the soft magnetic body 1.

  If the composite magnetic body is disposed so that the exit of the composite magnetic body faces the soft magnetic body 1, stress may be applied to the soft magnetic body 1 due to the injection of the composite magnetic body. It is desirable to arrange the magnetic body 1 so that it does not face directly. It should be noted that the injection ports are equally arranged at three points with respect to the circumferential distance of the soft magnetic body 1 so that the composite magnetic body is uniformly filled in the sealed space of the mold 41, the mold 42, and the soft magnetic body 1. Is desirable. For example, when the soft magnetic body 1 is a toroidal core, it is desirable that the injection ports are arranged every 120 degrees with respect to the circumferential direction. In addition, when a projection is generated at the exit portion when the entire composite magnetic body is completely solidified, it is desirable to fold or scrape it to avoid stress on the winding. Therefore, a slight dent is generated in the portion of the composite magnetic material surface which is the injection port.

  The surface of the magnetic core 3 prepared as described above may be covered with a thermosetting resin or the like. For example, when silicone is used as the thermosetting resin, the surface of the magnetic core 3 is flexible, so Even when a load such as thermal stress is applied, the stress applied to the insulating film can be minimized. Further, when an epoxy resin is used as the thermosetting resin, there is an effect of stability due to cross-linking chemical bonding of the resin such as corrosion resistance and high temperature and humidity resistance. Since it can be applied or molded at a pressure close to atmospheric pressure, the impact on the entire magnetic core is small.

  FIG. 6 is a perspective view of another closed magnetic circuit magnetic core in the wire ring component of the present invention. As shown in FIG. 6, the magnetic core pieces 31 and 32 in which the surface of the soft magnetic material corresponding to about a half circumference of the magnetic path is covered with the composite magnetic material are opposed to each other, and the magnetic gap between the magnetic core piece 31 and the magnetic core piece 32 is satisfied. The part to be heated is preferably heated locally to a temperature higher than the thermal deformation temperature of the composite magnetic piece 23, and the composite magnetic piece 23 is sandwiched in a place corresponding to the magnetic gap between the magnetic core pieces 31 and 32, The magnetic core 3 may be formed by bonding by applying pressure from the magnetic core pieces 31 and 32. Note that the magnetic permeability and magnetic force of the composite magnetic piece 23 can be reduced by exposing the composite magnetic body at the portion corresponding to the magnetic gap in the magnetic core pieces 31 and 32 in advance to expose the internal soft magnetic body. This is desirable because it effectively acts on the magnetic core 3.

  FIG. 7 is a cross-sectional view showing the structure of the composite magnetic piece and the mold in the wire ring component of the present invention. When flat metal soft magnetic powder is used as the magnetic powder of the rectangular flat plate-shaped composite magnetic piece 23, the oriented magnet 441 and the oriented magnet 442 are opposed to each other in the thickness direction of the composite magnetic piece 23 as shown in FIG. By injecting and forming the composite magnetic body in a thermoplastic state on the mold 44 arranged as described above, the soft magnetic metal powder on the flat which is randomly oriented in the direction perpendicular to the direction of flow of the composite magnetic body This is desirable because it can be aligned by the magnetic field generated by the orientation magnet 441 and the orientation magnet 442, and the magnetic permeability can be maximized in the thickness direction of the composite magnetic piece 23. Similarly, when the hard magnetic powder is used as the magnetic powder of the composite magnetic piece 23, the thickness of the composite magnetic piece 23 is aligned by orienting the magnetization of the hard magnetic powder in the thickness direction of the composite magnetic piece 23. Magnetic force can be generated in the direction.

  An example of carrying out the present invention will be described below.

  A composite magnetic material composed of the thermoplastic resin and magnetic powder shown in Table 1 is blended at the volume content of the magnetic powder with respect to the composite magnetic material as shown in Table 1, and if the thermoplastic resin is PPS, the cylinder temperature is 295 ° C. When the thermoplastic resin is nylon 12, the cylinder temperature is 200 ° C. or higher and 240 ° C. or higher, and the mold temperature is maintained at 130 ° C., which is 30 ° C. lower than the heat deformation temperature 260 ° C. of PPS. Injected into the mold while maintaining the mold temperature at 110 ° C., which is 30 ° C. or more lower than the heat deformation temperature of 170 ° C. of nylon 12 to obtain a molded product of the composite magnetic material. Evaluation was performed. The particle shape of the magnetic powder in Table 1 indicates that the particle is a particle having a particle size distribution D50 of 10 μm or more and 20 μm or less, and D90 is 50 μm or more and 60 μm or less. / Minor axis) shows a magnetic powder having an average value of 1/10 or more and 1/5 or less and a thickness of 1 μm or more and 9 μm or less. In order to evaluate the soft magnetic properties, the composite magnetic body is formed to have an outer diameter of 12.8 mm, an inner diameter of 7.5 mm, and a thickness of 5 mm, wound by 25 to 35 turns, and a current of 1 MHz is passed through the winding. The magnetic permeability was obtained from the measured inductance value. The saturation magnetization of the composite magnetic material was determined by measuring the history of the magnetic flux density and the applied magnetic field over one tens of seconds with a DC curve tracer. The shape of the ring magnetic core at that time is an outer diameter of 59.85 mm, an inner diameter of 34.85 mm, and a height of 15 mm.

  From the results shown in Table 1, if the particle shape of the magnetic powder is granular, the magnetic powder can be filled into the composite magnetic body as compared with the case where the particle shape is flat. Since the magnetic susceptibility μ ′ has a lower value than when the particle shape is flat, it can be suitably used for filling a magnetic gap of a choke coil used in a boost power supply circuit or the like.

  On the other hand, when the particle shape of the magnetic powder is flat, since the magnetic permeability is high, the magnetic powder can be suitably used for a wire ring part for noise filters and the like that require high magnetic permeability in the magnetic core.

  Moreover, when the magnetic powder is a ferrite powder and when it is a granular metal soft magnetic powder, a large difference in magnetic permeability is not observed, but the saturation magnetization is larger in the granular metal soft magnetic powder. Therefore, it can be seen that it is preferable to use ferrite powder having high electrical insulation as the magnetic powder of the composite magnetic body covering the surface of the magnetic core.

  Table 2 shows the results of measuring volume resistivity, bending strength, impact strength (IZOD), and molding density for Examples 13, 14, 15, and 16 in Table 1. The volume resistivity is 4339B and 16008B manufactured by Agilent, the charge time is 60 seconds, the presser pressure is 5 kg, the composite magnetic body is molded into a shape of 100 mm × 100 mm × 3 mm, and 100 V is applied in the thickness direction. The measurement was performed according to IEC 60093.

  From the results in Table 2, it can be seen that the strength of the composite magnetic body is higher when nylon 12 is used as the thermoplastic resin of the composite magnetic body. In Example 10, a metal soft magnetic powder is used as the magnetic powder of the composite magnetic material, but a sufficient volume resistivity is ensured.

In addition to the above examples, the composite magnetic body of Example 16 was prepared by blending granular NdFeB powder, which is hard magnetic powder, and Sr ferrite powder as magnetic powder so as to have a volume of 1: 1, and nylon 12 as resin. By setting the volume content of the magnetic powder with respect to the composite magnetic material to 70%, a magnetic force of about 400 mT and a resistivity of 1 × 10 ⁵ Ω · cm or more could be secured.

DESCRIPTION OF SYMBOLS 1 Soft magnetic body 11 Magnetic gap 12 Another soft magnetic body 2 Composite magnetic body 21 Composite magnetic body 22 Composite magnetic body 221 Composite magnetic body 222 Composite magnetic body 23 Composite magnetic body piece 231 Composite magnetic body piece 232 Composite magnetic body piece 3 Magnetic Core 31 Magnetic core piece 32 Magnetic core piece 41 Die 42 Die 431 Pin 432 Pin 44 Die 441 Oriented magnet 442 Oriented magnet 51 Injection port 52 Injection port 6 Magnetic orientation type 7 Electric wire I Direction of current flow to electric wire

Claims (9)

  The magnetic core comprises a magnetic core constituting a closed magnetic path, and windings that circulate around the magnetic path of the magnetic core. The magnetic core includes a conductive soft magnetic material, a thermoplastic resin that covers a surface of the soft magnetic material, and a magnetic material. A wire ring component comprising a composite magnetic body containing powder, wherein the composite magnetic body has a volume resistivity higher than that of the soft magnetic body.   The wire ring component according to claim 1, wherein the soft magnetic body in the magnetic core has a magnetic gap, and the magnetic gap is filled with the composite magnetic body. The magnetic powder contains ferrite powder, and the ferrite powder is contained in the composite magnetic body in an amount of 60% by volume or less (however, 0 is not included), and the volume resistivity of the composite magnetic body is 1 × 10 ⁹ Ω · cm or more. The wire ring component according to claim 1, wherein the wire ring component is a The composite magnetic body contains the magnetic powder in an amount of 70% by volume or less (excluding 0), the magnetic powder has a volume content of 50% or less (excluding 0), and a volume content The wire ring component according to claim 1, wherein the composite magnetic body has a volume resistivity of 1 × 10 ⁵ Ω · cm or more.   The surface of the magnetic core excluding the portion facing the soft magnetic body of the composite magnetic body has a lower magnetic powder content than the inside of the composite magnetic body and the surface facing the soft magnetic body. Item 5. A wire ring component according to any one of Items 1 to 4.   6. The inner end portion or the outer end portion of the magnetic core at a portion obtained by dividing the magnetic path in the magnetic core into three equal parts on the surface of the composite magnetic body in the magnetic core has a recess. A wire ring component according to any one of the above.   The wire ring component according to any one of claims 1 to 6, wherein the surface of the composite magnetic body is covered with a thermosetting resin. The thermoplastic resin is a resin containing any of ABS resin, PBT resin, PET resin, PPS resin, nylon 6, nylon 66, nylon 12, and liquid crystal polymer, and D90 (cumulative weight fraction) of the magnetic powder. The particle diameter corresponding to 90%) is a spherical or irregular shaped powder of 60 μm or less (excluding 0), and the molding density of the composite magnetic material is 2 g / cm ³ or more and 8 g / cm ³ or less. The wire ring component according to any one of claims 1 to 7, The thermoplastic resin is a resin containing any of ABS resin, PBT resin, PET resin, PPS resin, nylon 6, nylon 66, nylon 12, and liquid crystal polymer, and the metal magnetic powder is a flat powder with an average thickness. The aspect ratio defined by the short side / long side is 1/5 or less, and the molding density of the composite magnetic body is 2 g / cm ³ or more and 8 g / cm ³ or less. The wire ring component according to claim 4, wherein the wire ring component is provided.

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