Reactor

Abstract

To provide a reactor capable of reducing eddy current loss and heat generation by suppressing magnetic flux from hitting the end face of a magnetic sensor.SOLUTION: A reactor 10 includes: air-core coils 1 each formed of a wound conductive member; magnetic bodies 2 disposed facing end faces of the air-core coils 1 perpendicular to a winding axis direction; and a magnetic sensor 3 formed of a wound conductive member and detecting a magnetic state of the reactor 10. The magnetic sensor 3 is arranged on outer periphery of the magnetic body 2 other than extension areas of inner diameter surfaces of the air-core coils 1 orthogonal to the winding axis direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a reactor provided with a magnetic sensor made of a conductive member.

Background Art

[0002] Reactors are used in various applications such as OA equipment, solar power generation systems, and automobiles. A reactor has a coil and magnetic bodies disposed on both end faces orthogonal to the winding axis direction of the coil. The coil is electrically connected to an external device, and when power is supplied from the external device, a magnetic flux is generated. The magnetic body serves as a magnetic path through which the magnetic flux generated by the coil passes. Thus, the reactor 100 is an electromagnetic component that converts electrical energy into magnetic energy for storage and release.

[0003] Some reactors are provided with a magnetic sensor formed by winding a conductive member to detect magnetism. In order to detect more magnetic flux, this magnetic sensor was disposed between the coil and the magnetic body facing an end face orthogonal to the winding axis direction of the coil. That is, the magnetic sensor was disposed within an extended region of the inner diameter surface that becomes the hollow portion of the coil.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] A hollow coil may be used as the coil. When a magnetic body is inserted into the inner circumference of the coil, since the magnetic body serves as a magnetic path, except for leakage magnetic flux, it is difficult for the magnetic flux to hit the end face of the conductive member constituting the magnetic sensor. On the other hand, when a hollow coil is used, the magnetic flux generated from the hollow coil spreads at the boundary with the magnetic body, and compared with the case where a magnetic body is inserted into the inner circumference of the coil, the amount of magnetic flux hitting the end face of the conductive member constituting the magnetic sensor increases.

[0006] Specifically, as shown in FIG. 11, the magnetic flux generated in the hollow coil 101 flows toward the magnetic body 102 (the arrows shown in FIG. 11 indicate the flow of the magnetic flux). Then, since it spreads from the end of the hollow coil 101 toward the magnetic body 102 (the portion surrounded by the broken-line circle in FIG. 11), the leakage magnetic flux may not pass through the inner circumference of the magnetic sensor 103 and may hit the end face. Similarly, the magnetic flux that has flowed through the magnetic body 102 may flow toward the hollow coil 101 and may hit the end face of the magnetic sensor 103.

[0007] When the magnetic flux hits the end face of the magnetic sensor, eddy current loss occurs in the magnetic sensor. Therefore, as the amount of magnetic flux hitting the end face of the magnetic sensor increases, the eddy current loss also increases. And since the magnetic sensor generates heat in proportion to the increase in the eddy current loss, as a result, the heat generation amount of the reactor also increases.

[0008] The present invention has been made to solve the above problems, and an object thereof is to provide a reactor capable of suppressing the magnetic flux from hitting the end face of the magnetic sensor and reducing the eddy current loss and the heat generation amount.

Means for Solving the Problems

[0009] The reactor of the present invention is formed by winding a conductive member in a cylindrical shape A plurality of a hollow coil, So as to straddle the plurality of air-core coils, a magnetic body disposed to face the inner diameter surface that becomes the hollow portion of the hollow coil perpendicular to the winding axis direction, and a magnetic sensor formed by winding a conductive member and detecting the magnetic state of the reactor. The plurality of provided air-core coils are arranged side by side so that the winding axis directions are parallel, The magnetic sensor is wound around the outer circumference of the magnetic body outside the extension region of the inner diameter surface of the air core coil.

Advantages of the Invention

[0010] According to the present invention, it is possible to obtain a reactor that suppresses magnetic flux from hitting the end face of the magnetic sensor and reduces eddy current loss and the amount of heat generation.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

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Figure 7

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Figure 10

Figure 11

Modes for Carrying Out the Invention

[0012] (First Embodiment) The reactor according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of the reactor. The reactor 10 is an electromagnetic component that converts electrical energy into magnetic energy for storage and release, and is used in various applications such as OA equipment, solar power generation systems, and automobiles. The reactor 10 of the present embodiment includes an air-core coil 1, a magnetic body 2, a magnetic sensor 3, and a case 4.

[0013] The air-core coil 1 is composed of a single flat conductive member insulated with enamel or the like. The air-core coil 1 is formed by winding the conductive member into a cylindrical shape while shifting the winding position in the winding axis direction, and has a hollow portion in which the magnetic body 2 is not inserted in the inner peripheral portion. In the present embodiment, it is an edgewise coil of a flat wire made of a copper wire. However, the type of wire material and the winding method of the air-core coil 1 are not limited to this, and other forms may be used.

[0014] The air-core coil 1 with no magnetic body inserted in the inner peripheral portion is characterized in that the inductance value is constant regardless of the current value flowing through the coil. On the other hand, a coil with a magnetic body inserted in the inner peripheral portion has the characteristic that as the current value flowing through the coil increases, the magnetic body saturates and the inductance decreases. Thus, the characteristics of the air-core coil 1 of the present invention and the coil with a magnetic body inserted in the inner peripheral portion are greatly different.

[0015] Two air-core coils 1 are provided. The air-core coils 1 are arranged side by side with a gap therebetween so that the winding axis directions are parallel. The end portions of the conductive members of the air-core coils 1 are electrically connected to external devices, and magnetic fluxes are generated when power is supplied from these external devices.

[0016] The magnetic body 2 serves as a magnetic path through which the magnetic flux generated by the air-core coil 1 flows. As the magnetic body 2, a compressed powder core, a ferrite core, a laminated steel plate, a metal composite, or the like can be used. A metal composite is a magnetic body formed by kneading magnetic powder and resin and curing the resin.

[0017] The magnetic bodies 2 are generally rectangular in shape and two of them are provided. The magnetic bodies 2 are respectively arranged facing the inner diameter surface of the air-core coil 1 that is orthogonal to the winding axis direction. The inner diameter surface of the air-core coil 1 refers to the surface orthogonal to the winding axis direction of the cavity portion of the air-core coil 1 formed in a cylindrical shape (the hatched portion in Fig. 2). That is, the magnetic bodies 2 are arranged opposite to each other with the air-core coil 1 sandwiched therebetween.

[0018] The magnetic sensor 3 detects the magnetic state of the reactor 10. Specifically, it detects the magnetic flux flowing through the reactor 10. The magnetic sensor 3 is made of a conductive member. The magnetic sensor 3 is formed by winding this conductive member, and the number of turns is, for example, 1 turn or less. By setting it to 1 turn or less, the process of winding the conductive member is minimized, productivity is improved, and material costs are reduced. The magnetic sensor 3 of the present embodiment has a substantially U-shaped configuration composed of a short side portion where two places of the conductive member are bent at a substantially right angle and two long side portions extending from both ends of the short side portion.

[0019] The magnetic sensor 3 is arranged outside the extension region of the inner diameter surface of the air-core coil 1. The magnetic sensor 3 is wound around the outer periphery of the approximate center portion of one of the magnetic bodies 2. Specifically, the short side portion is sandwiched between the magnetic body 2 and the case 4, and the two long side portions are arranged so as to sandwich the magnetic body 2. The magnetic sensor 3 is arranged between the two air-core coils 1. Note that the magnetic sensor 3 of the present embodiment does not measure the total amount of magnetic flux, and it is sufficient to be able to detect the time change of the magnetic flux. Therefore, even if it is arranged between the two air-core coils 1, it does not affect the detection function.

[0020] The magnetic sensor 3 is integrally molded and fixed to the magnetic body 2 with resin (not shown). Examples of the type of resin include epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), etc.

[0021] The cross-sectional area of the conductive member constituting the magnetic sensor 3 is smaller than the cross-sectional area of the conductive member constituting the air-core coil 1. Although not limited thereto, for example, the cross-sectional area of the conductive member constituting the magnetic sensor 3 is about one-sixth of the cross-sectional area of the conductive member constituting the air-core coil 1. That is, when the cross-sectional area of the conductive member constituting the air-core coil 1 is 6 mm 2 , the cross-sectional area of the conductive member constituting the magnetic sensor 3 is 1 mm 2 .

[0022] Further, the reactor 10 includes a temperature sensor (not shown) for detecting the temperature of the reactor 10. The temperature sensor is disposed between the air-core coils 1. Note that the temperature sensor may be integrally formed and fixed with the magnetic body 1 and the magnetic sensor 3 by resin, or a holding portion may be provided in the resin and the temperature sensor may be inserted and fixed therein.

[0023] The case 4 has a box shape with an open upper surface. The case 4 houses the air-core coil 1, the magnetic body 2, the magnetic sensor 3, and the temperature sensor. The case 4 is made of a metal having high thermal conductivity and low weight, such as an aluminum alloy, and has heat dissipation properties. Note that after the air-core coil 1, the magnetic body 2, the magnetic sensor 3, and the temperature sensor are housed in the case 4, a filler may be injected into the case 4. As the filler, a resin that is relatively soft and has high thermal conductivity, such as a silicone resin, a urethane resin, an epoxy resin, or an acrylic resin, is suitable.

[0024] (Operation) As shown in FIG. 11, conventionally, the magnetic sensor 103 was disposed in an extended region of the inner diameter surface of the air-core coil 101 in order to detect more magnetic flux. The magnetic flux generated from the air-core coil 101 spreads toward the magnetic body 102, and the magnetic flux flowing through the magnetic body 102 flows toward the air-core coil 102. Therefore, a part of the magnetic flux may hit not only the inner peripheral portion of the magnetic sensor 103 but also the end surface of the conductive member. When the magnetic flux hits the end surface of the conductive member, the eddy current loss increases, and as a result, the heat generation increases.

[0025] However, in this embodiment, the magnetic sensor 3 is not located in the extended region of the inner diameter surface of the air-core coil 1, but is disposed between the air-core coils 1 and at approximately the central portion of the magnetic body 2. Therefore, as shown in FIG. 3, the magnetic flux generated from the air-core coil 1 enters the magnetic body 2, flows through the magnetic body 2, passes through the inner circumference of the magnetic sensor 3, and then flows from the magnetic body 2 into the air-core coil 1. That is, it is possible to prevent the magnetic flux from hitting the magnetic sensor 3. Further, the magnetic sensor 3 is provided on the outer circumference of the magnetic body 2 such that the short side portion is sandwiched between the magnetic body 1 and the case 4, and the two long side portions sandwich the magnetic body 2. Therefore, it is possible to detect the magnetic flux flowing through the magnetic body 2 serving as a magnetic path.

[0026] (Effect) As described above, the reactor 10 of this embodiment includes an air-core coil 1 formed by winding a conductive member, a magnetic body 2 disposed to face the inner diameter surface of the air-core coil 1 orthogonal to the winding axis direction, and a magnetic sensor 3 made of a conductive member, disposed on the outer circumference of the magnetic body 1, for detecting the magnetic state of the reactor 10. And the magnetic sensor 3 is disposed on the outer circumference of the magnetic body 2 outside the extended region of the inner diameter surface of the air-core coil 1 orthogonal to the winding axis direction.

[0027] Thereby, it is possible to prevent the magnetic flux from hitting the magnetic sensor 3, so that the eddy current loss can be suppressed. And by suppressing the eddy current loss, the heat generation of the magnetic sensor 3 can also be suppressed. As a result, the eddy current loss and the heat generation amount of the reactor 10 can be reduced. Further, since the magnetic sensor 3 is disposed on the outer circumference of the magnetic body 2, it is possible to measure the change amount of the magnetic flux flowing through the magnetic body 2 serving as a magnetic path, and the magnetic sensor 3 also functions as a sensor.

[0028] The cross-sectional area of the conductive member constituting the magnetic sensor 3 is smaller than the cross-sectional area of the conductive member constituting the air-core coil 1. Thereby, miniaturization of the magnetic sensor 3 can be realized, and as a result, the reactor 10 can be miniaturized.

[0029] Conventionally, when the magnetic sensor 103 is arranged in the extended region of the inner diameter surface of the air core coil 101, the amount of heat generated by the magnetic sensor 103 increases. In order to improve heat dissipation, it was necessary to thicken the conductive member constituting the magnetic sensor 103, that is, to increase the cross-sectional area and wire diameter.

[0030] However, in this embodiment, since the amount of heat generated by the magnetic sensor 3 can be reduced, there is no need to improve the heat dissipation of the magnetic sensor 3. Therefore, the cross-sectional area of the conductive member constituting the magnetic sensor 3 can be reduced, and as a result, the wire diameter of the magnetic sensor 3 can also be reduced. Therefore, the magnetic sensor 3 can be miniaturized, and as a result, the reactor 10 can be miniaturized.

[0031] Furthermore, two air core coils 1 are provided, and the two provided air core coils 1 are arranged side by side so that the winding axis directions are parallel. The magnetic sensor is arranged between the air core coils 1, and the temperature sensor for detecting the temperature of the reactor is arranged between the air core coils 1.

[0032] As described above, since the amount of heat generated by the magnetic sensor 3 can be suppressed, the wire diameter of the magnetic sensor 3 can be reduced. Therefore, the gap between the air core coils 1 arranged side by side can be shortened. The temperature sensor can detect the temperature more accurately when arranged closer to the air core coil 1. Therefore, by arranging the temperature sensor between the air core coils 1 with a shortened gap, the temperature of the reactor 10 can be detected more accurately.

[0033] The magnetic sensor 3 is integrally formed and fixed with resin together with the magnetic body 2. Thereby, even if the reactor 10 vibrates, the position of the magnetic sensor 3 can be prevented from shifting, so that a good detection state can be maintained. In addition, by integrally forming with the magnetic body 2, the operation of fixing the magnetic sensor 3 can be omitted, and productivity is improved.

[0034] (Second Embodiment) The reactor according to the second embodiment will be described with reference to the drawings. The same components and functions as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted, and only different parts will be described. FIG. 4 is a perspective view showing the overall configuration of the reactor 10 according to the second embodiment. FIG. 5 is a plan view of the reactor 10 according to the second embodiment.

[0035] In the reactor 10 of the second embodiment, the number of the air-core coils 1, the shape of the magnetic body 2, and the number of the magnetic sensors 3 are different. Three air-core coils 1 are provided and arranged side by side with a gap therebetween so that the winding axis directions are parallel. Specifically, the air-core coil 1b is disposed in the middle, and the air-core coils 1a and 1c are disposed on both sides thereof with the air-core coil 1b interposed therebetween.

[0036] The magnetic body 2 has a protruding portion 21. This protruding portion 21 is also made of a dust core, a ferrite core, a laminated steel sheet, a metal composite, or the like, and serves as a magnetic path through which magnetic flux flows. The protruding portion extends from the surface facing the air-core coils 1a, 1b, and 1c toward the air-core coils 1a, 1b, and 1c. The magnetic body 2 has the same number of protruding portions 21 as the number of the air-core coils 1. The protruding portions 21 included in each magnetic body 2 are disposed opposite to each other with the air-core coil 1 interposed therebetween.

[0037] The protruding portion 21 may be inserted into the inner circumferences of the air-core coils 1a, 1b, and 1c. However, the sum of the lengths inserted into the inner circumferences of the air-core coils 1 in the opposing protruding portions 21 is equal to or less than half of the length of the air-core coil 1 in the winding axis direction. That is, as shown in FIG. 6, when the lengths in the winding axis direction inserted into the inner circumferences of the air-core coils 1 of the opposing protruding portions 21 are L1 and L2, respectively, and the length in the winding axis direction of the air-core coil 1c is L3, (L1 + L2) ≦ (L3 / 2) is satisfied. That is, the air-core coil 1 in the present invention includes those in which more than half of the inner circumference of the coil is hollow.

[0038] Note that the space between the opposing protrusions 21 is different from a gap. The gap is provided to give a magnetic gap of a predetermined width between magnetic bodies and prevent a decrease in the inductance of the reactor. As described above, since the air-core coil 1 has a constant inductance value regardless of the current value, there is no need to prevent a decrease in inductance in the first place. Therefore, the portion where more than half of the inner circumference of the air-core coil 1 is a cavity is different from the gap that prevents a decrease in inductance. As will be described later, the protrusion 21 is provided to suppress the spreading of magnetic flux and the collision of magnetic flux against the end faces of the conductive members constituting the air-core coil 1. To prevent the magnetic flux from spreading and hitting the end faces of the conductive members that make up the air-core coil 1.

[0039] Also, the reactor 10 of this embodiment includes a flat plate-shaped magnetic body 22. Four plate-shaped magnetic bodies 22 are provided, and are respectively provided between the air-core coils 1a and 1b, between the air-core coils 1b and 1c, and at both ends of the magnetic body 2. The plate-shaped magnetic body 22 is joined to the magnetic body 2 with an adhesive or the like.

[0040] Three magnetic sensors 3 are provided. The magnetic sensor 3a is provided between the air-core coil 1a and the plate-shaped magnetic body 22, the magnetic sensor 3b is provided between the air-core coils 1a and 1b, and the magnetic sensor 3 is provided on the outer circumference of one of the magnetic bodies 2 between the air-core coil 1c and the plate-shaped magnetic body 22. The three magnetic sensors 3a, 3b, and 3c are all arranged on the outer circumference of the magnetic body 2 outside the extension region of the inner diameter surface of the air-core coil 1 orthogonal to the winding axis direction.

[0041] (Operation) Next, the operation will be described with reference to the drawings. FIG. 7 is a diagram showing the flow of magnetic flux when no protrusion is formed on the magnetic body. FIG. 8 is a diagram showing the flow of magnetic flux when a protrusion is formed on the magnetic body as in this embodiment. Note that the arrows in FIGS. 7 and 8 indicate the flow of magnetic flux.

[0042] As described above, the magnetic flux generated from the air-core coil 1 spreads toward the magnetic body 2, and the magnetic flux that has passed through the magnetic body 2 heads toward the air-core coil 1. Therefore, there is a risk that the magnetic flux hits the end face of the conductive member constituting the air-core coil 1, increasing the eddy current loss (enclosed by the broken line circle in FIG. 7).

[0043] However, by providing the protruding portion 21 on the magnetic body 2, as shown in FIG. 8, the magnetic flux generated from the air-core coil 1 flows toward the protruding portion 21, suppressing the spread of the magnetic flux at the boundary between the air-core coil 1 and the magnetic body 2. Also, the magnetic flux that has passed through the magnetic body 2 also flows through the protruding portion 21 and flows from the tip of the protruding portion 21 toward the air-core coil 1. As a result, it is possible to suppress the magnetic flux from hitting the end face of the conductive member constituting the air-core coil 1.

[0044] (Effect) As described above, the reactor 10 of the present embodiment has the protruding portion 21 where the magnetic body 2 extends from the surface facing the air-core coil 1 toward the air-core coil 1. Thereby, it is possible to suppress the magnetic flux from hitting the end face of the conductive member constituting the air-core coil 1. As a result, the eddy current loss of the reactor 10 can be reduced, and the amount of heat generated by the reactor 10 can also be reduced.

[0045] (Example) The present invention will be described in more detail based on examples. Note that the present invention is not limited to the following examples.

[0046] First, reactors of Example 1 and 2 and Comparative Example 1 and 2 were manufactured. Example 1 has the same configuration as the first embodiment (FIG. 1). On the other hand, in Comparative Example 1, as shown in FIG. 9, the position of the magnetic sensor is arranged between the air-core coil and the magnetic body (the extended region of the inner diameter surface of the air-core coil). Example 1 and Comparative Example 1 differ only in the position of the magnetic sensor, and the rest have the same configuration and the same members.

[0047] Example 2 has the same configuration as the second embodiment (Figs. 4 and 5). On the other hand, as shown in Fig. 10, Comparative Example 2 is arranged on the outer periphery of the magnetic body (the extension region of the inner diameter surface of the air-core coil) including the protruding portion. Example 2 and Comparative Example 2 are the same in configuration and members except that the positions of the magnetic sensors are different.

[0048] The eddy current losses of the magnetic sensors arranged at the positions of Examples 1 and 2 and Comparative Examples 1 and 2 were obtained from the simulation of magnetic field analysis. For Examples 1 and Comparative Example 1, magnetic field analysis was performed under the conditions of a current of 30 A and a magnetic flux density ΔB generated from the air-core coil of 163.66 mT. Also, for Examples 2 and Comparative Example 2, magnetic field analysis was performed under the conditions of a current of 30 A and a magnetic flux density ΔB generated from the air-core coil of 224.52 mT. The analysis results of Examples 1 and Comparative Example 1 are shown in Table 1, and the analysis results of Examples 2 and Comparative Example 2 are shown in Table 2. Note that a, b, and c in Table 2 respectively refer to the magnetic sensors 3a, 3b, and 3c in Figs. 4 and 10.

[0049]

Table 1

[0050]

Table 2

[0051] As shown in Table 1, it was confirmed that Example 1 can significantly reduce the eddy current loss to 1 / 30 or less compared to Comparative Example 1. Also, it was confirmed that Example 2 can significantly reduce the eddy current loss in each of the three magnetic sensors to about 1 / 40 compared to Comparative Example 2. That is, it was confirmed that the eddy current loss can be significantly reduced by providing the magnetic sensor on the outer periphery of the magnetic body other than the extension region of the inner diameter surface of the air-core coil.

[0052] (Other Embodiments) In this specification, embodiments of the present invention have been described. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. The above-described embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. Embodiments and their modifications are included in the scope and gist of the invention, as well as in the invention described in the claims and the equivalent scope thereof.

[0053] In this embodiment, the magnetic sensor 3 was integrally molded and fixed to the magnetic body 2 with resin, but it is not limited to this. For example, only the magnetic body 2 may be molded with resin, and a holding portion for the magnetic sensor may be formed by the resin during the molding process, and the magnetic sensor 3 may be fixed by this holding portion.

[0054] In this embodiment, the reactor 10 was provided with a temperature sensor between the air-core coils 1. However, any sensor may be used as long as the detection accuracy of the state of the reactor 10 is improved by shortening the distance between the air-core coils 1.

[0055] In the second embodiment, all three magnetic sensors 3 were arranged on the outer periphery of the magnetic body 2 outside the extension region of the inner diameter surface of the air-core coil 1 orthogonal to the winding axis direction. However, when the reactor 10 is provided with a plurality of magnetic sensors 3, at least one magnetic sensor 3 may be arranged on the outer periphery of the magnetic body 2 outside the extension region of the inner diameter surface of the air-core coil 1 orthogonal to the winding axis direction.

Explanation of Reference Numerals

[0056] 10 Reactor 1 Air-core coil 1a, 1b, 1c Air-core coils 2 Magnetic body 21 Protrusion 22 Plate-shaped magnetic body 3 Magnetic sensor 3a, 3b, 3c Magnetic sensors 4 Case 100 Reactor 101 Air-core coil 102 Magnetic material 103 Magnetic sensor

Claims

1. A plurality of air-core coils formed by winding a conductive member in a cylindrical shape, a magnetic body disposed to face the inner diameter surface that becomes the cavity portion of the air-core coil orthogonal to the winding axis direction so as to straddle the plurality of air-core coils, a magnetic sensor formed by winding a conductive member and detecting the magnetic state of the reactor, comprising: the plurality of provided air-core coils are arranged side by side so that the winding axis directions are parallel, the magnetic sensor is wound around the outer periphery of the magnetic body outside the extension region of the inner diameter surface of the air-core coil, a reactor characterized by the above.

2. the magnetic body has a protruding portion extending from the surface facing the air-core coil toward the air-core coil, the reactor according to claim 1, characterized by the above.

3. the cross-sectional area of the conductive member constituting the magnetic sensor is smaller than the cross-sectional area of the conductive member constituting the air-core coil, the reactor according to claim 1 or 2, characterized by the above.

4. further comprising a sensor for detecting the state of the reactor, a plurality of the air-core coils are provided, the plurality of provided air-core coils are arranged side by side so that the winding axis directions are parallel, the magnetic sensor is disposed between the air-core coils, the sensor is disposed between the plurality of provided air-core coils, the reactor according to any one of claims 1 to 3, characterized by the above.

5. the magnetic sensor is integrally formed and fixed to the magnetic body by resin, the reactor according to any one of claims 1 to 4, characterized by the above.

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