JP2019197779A - Reactor - Google Patents

Abstract

To provide a reactor with high heat dissipation efficiency against heat generated from a coil.SOLUTION: A reactor X includes a coil 1 in which a flat conductive wire 10 is wound in the longitudinal direction of a plate surface S of the conductive wire 10 such that the plate surface S is curved, a magnetic core 2 surrounding the coil 1, and a conductive member 3 electrically connected to the inner peripheral side of the coil 1. The conductive member 3 has an exposed portion 31 exposed to the outside of the magnetic core 2, and the exposed portion 31 has a cooling function for cooling the coil 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reactor including a flat-wise coil and a magnetic core surrounding the coil.

  A reactor is a passive element using a coil, and is used for boosting a direct current, smoothing a direct current, or the like. The reactor is incorporated in a converter device or an inverter device provided between a motor and a battery in a hybrid vehicle or an electric vehicle. When a reactor is mounted on a vehicle, a compact reactor is required due to restrictions on the mounting space. Therefore, a so-called pot-type core composed of a magnetic core surrounding a coil is widely used.

  The coil housed inside the core is a flat-wise coil or a flat wire plate in which a conductive wire is wound along the longitudinal direction of the flat plate so that the flat conductive wire (flat wire) is curved. 2. Description of the Related Art An edgewise coil is known that is wound along a plate thickness surface (side surface) of a rectangular wire so that is flat. The edge-wise coil is structured to wind a flat wire along the thickness of the plate, and is not easily flattened for heat dissipation, and a flat-wise coil is often used in a reactor through which a high-frequency current flows.

  On the other hand, in flat-wise winding capable of flowing a high-frequency current, Joule heat due to the current flowing in the coil having electric resistance and Joule heat due to eddy current generated in the coil due to a change in the magnetic field are increased. The structure is known (see, for example, Patent Documents 1 and 2).

  In the cooling structure described in Patent Document 1, a heat sink to which a magnetic core of a reactor is attached is provided, and a heat transfer member is interposed between the magnetic core and the heat sink. Thereby, it has the structure which releases the heat_generation | fever from a coil to a heat sink via a heat-transfer member.

  In the cooling structure described in Patent Document 2, coolers are arranged on both sides of a magnetic core surrounding a coil, and a stacked body in which magnetic cores and coolers are alternately stacked is pressed in the stacking direction. The magnetic core is a flat body having a thin thickness in the stacking direction so that heat generated from the coil is released to the cooler.

JP 2017-224715 A JP 2014-138812 A

  The coils of the flatwise windings described in Patent Documents 1 and 2 are more likely to store heat in the inner conductor having a small surface area in contact with the magnetic core as compared with the outer conductor, and radiate heat from the center of the magnetic core. Efficiency is reduced. For this reason, the cooling structures described in Patent Documents 1 and 2 cannot efficiently dissipate heat generated from the coils.

  Therefore, a reactor having high heat dissipation efficiency for heat generation from the coil is desired.

  A characteristic configuration of the reactor according to the present invention includes a coil in which the conductive wire is wound along the longitudinal direction of the plate surface so that the plate surface of the flat conductive wire is curved, a magnetic core surrounding the coil, A conductive member electrically connected to the inner peripheral side of the coil, and the conductive member has an exposed portion exposed to the outside of the magnetic core, and the exposed portion is It has a cooling function for cooling the coil.

  In this configuration, in a flat-wise coil in which a conductive wire is wound along the longitudinal direction of the plate surface so that the plate surface of the flat conductive wire is curved, the electrical conductivity electrically connected to the inner peripheral side of the coil A member is provided. The conductive member has an exposed portion exposed to the outside of the magnetic core, and the exposed portion has a cooling function for cooling the coil. That is, for example, the exposed portion can be also used as a cooling member for cooling the coil while being an extraction terminal that is electrically connected to another electronic component.

  As a result, it is possible to dissipate heat generated from the inner peripheral side of the coil that is likely to store heat through the conductive member. On the other hand, heat generated from the outer peripheral side of the coil having a larger surface area than the inner peripheral side of the coil is smoothly radiated through the magnetic core. Therefore, heat generated from the inner peripheral side of the coil and heat generated from the outer peripheral side of the coil can be efficiently radiated.

  Thus, the reactor with the high thermal radiation efficiency with respect to the heat_generation | fever from a coil was able to be provided.

  As another characteristic configuration, the magnetic core has a pot shape configured to seal the coil.

  Even if the magnetic core has a pot shape that hardly dissipates heat generated from the coil as in this configuration, high heat dissipation efficiency can be obtained.

  As another characteristic configuration, the conductive member is that a cooling fin is connected to the exposed portion.

  If the cooling fin is connected to the exposed portion as in this configuration, the heat dissipation efficiency through the conductive member for the heat generation from the inner peripheral side of the coil can be further improved.

  Another characteristic configuration is that a slit is formed in a portion of the conductive member that intersects the magnetic core.

  Since the conductive member is exposed to the outside of the magnetic core while being electrically connected to the inner peripheral side of the coil, there is a portion that intersects the magnetic core, and there is a possibility that the flow of magnetic flux may be blocked at the intersecting portion. is there. In this case, an eddy current is generated at the intersection of the conductive member with the magnetic core, and the performance of the reactor is deteriorated. Therefore, if a slit is formed in a portion of the conductive member that intersects the magnetic core as in this configuration, the magnetic flux can flow smoothly through the slit, and the performance of the reactor is improved while improving the heat dissipation efficiency. Can be maintained.

  As another characteristic configuration, the conductive member is formed in a cylindrical shape electrically connected over the entire inner circumference of the coil.

  If the conductive member is electrically connected over the entire inner circumference of the coil as in this configuration, the heat generated from the inner circumference of the coil can be uniformly dissipated in the circumferential direction. Therefore, the heat dissipation efficiency through the conductive member for the heat generation from the inner peripheral side of the coil can be further increased.

  As another characteristic configuration, the conductive member is formed by a hollow tube having both end portions constituting the exposed portion.

  If the conductive member is formed of a hollow tube and the exposed portions are formed at both ends of the hollow tube as in this configuration, the refrigerant can be circulated inside the hollow tube. As a result, the heat generated from the inner peripheral side of the coil can be actively dissipated through the refrigerant.

  As another characteristic configuration, a plurality of the coils are disposed so as to be laminated along a central axis, and the inner peripheral sides of the plurality of coils are electrically connected by the conductive member. It is in.

  When a plurality of coils are stacked along the central axis as in this configuration, the magnetic flux density can be increased, so that the degree of freedom in designing the reactor can be increased according to the required performance. At this time, since the inner peripheral side of each of the plurality of coils is electrically connected by a conductive member, the conductive member is used as a connection terminal between the plurality of coils and utilized as a cooling member for cooling the coil. Can do.

It is a longitudinal cross-sectional view of the reactor which concerns on 1st embodiment. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a perspective view of the reactor which concerns on 1st embodiment. It is a longitudinal cross-sectional view of the reactor which concerns on 2nd embodiment. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a longitudinal cross-sectional view of the reactor which concerns on 3rd embodiment. It is the VIII-VIII sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the reactor which concerns on 4th embodiment. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is the XI-XI sectional view taken on the line of FIG.

  Hereinafter, an embodiment of a reactor according to the present invention will be described based on the drawings. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the invention.

[Basic configuration]
The reactor X in the present embodiment is incorporated in a converter device or an inverter device provided between a motor and a battery in a hybrid vehicle or an electric vehicle. The reactor X is fixed to a circuit board (not shown) or a casing (not shown) of the converter device or the inverter device.

  As shown in FIGS. 1 to 4, the reactor X is a coil 1 in which the conductive wire 10 is wound along the longitudinal direction of the plate surface S so that the plate surface S of the flat conductive wire 10 (flat wire) is adjacent. And a magnetic core 2 surrounding the coil 1.

  The conductive wire 10 of the coil 1 is a flat wire formed by coating a flat metal material made of copper, aluminum or the like having a low electrical resistivity with an insulating material made of a heat-resistant resin such as polyimide amide. . The coil 1 is a so-called flatwise winding formed by winding the conducting wire 10 around the central axis C in a spiral shape so that the plate surface S is curved (see FIG. 4). In other words, in the coil 1, the plate surface S of the conducting wire 10 is arranged in parallel with the central axis C, and the plate surfaces S facing each other in a direction perpendicular to the central axis C overlap with each other. The conducting wire 10 is wound (see FIG. 1).

  The coil 1 has an inner peripheral end 10a and an outer peripheral end 10b of the conducting wire 10, and the outer peripheral end 10b is drawn out of the magnetic core 2 (see FIG. 3).

  The magnetic core 2 is a so-called pot-type core that encloses the coil 1 so as to cover the entire area of the surface of the coil 1. That is, the magnetic core 2 in the present embodiment has a pot shape configured to seal the coil 1. The magnetic core 2 is formed by laminating a sintered core obtained by sintering and molding a magnetic powder composed of iron or an iron alloy having a high thermal conductivity, or a thin magnetic steel sheet composed of iron or an iron alloy. It is formed of a laminated core or the like.

  The magnetic core 2 has a first magnetic core 2a and a second magnetic core 2b that are divided into two along the vertical plane of the central axis C (see FIGS. 1 and 4). The first magnetic core 2a includes a first cylindrical portion 21a formed in a cylindrical shape on the inner peripheral side, a first outer peripheral wall portion 21b formed in an annular shape on the outer peripheral side, a first cylindrical portion 21a, and It has a disk-shaped top wall 21c that connects the first outer peripheral wall portion 21b. Similarly, the second magnetic core 2b includes a second cylindrical portion 22a formed in a cylindrical shape on the inner peripheral side, a second outer peripheral wall portion 22b formed in an annular shape on the outer peripheral side, and a second cylindrical shape. And a disc-shaped bottom wall 22c connecting the portion 22a and the second outer peripheral wall portion 22b. In the first magnetic core 2a and the second magnetic core 2b, the end surface of the first cylindrical portion 21a is in contact with the end surface of the second cylindrical portion 22a, and the end surface of the first outer peripheral wall portion 21b is the second outer peripheral wall. Each other is connected so as to be in contact with the end face of the portion 22b. The connection method between the first magnetic core 2a and the second magnetic core 2b is a mode in which the first magnetic core 2a is placed on the second magnetic core 2b, and the first magnetic core 2a and the second magnetic core 2b. Any form, such as a form in which the body core 2b is concavo-convexly fitted, a form in which the first magnetic body core 2a and the second magnetic body core 2b are welded or bonded, may be employed.

  Side wall holes 23 through which the outer peripheral end 10b of the conducting wire 10 is drawn are formed in the first outer peripheral wall 21b and the second outer peripheral wall 22b of the first magnetic core 2a and the second magnetic core 2b, respectively. ing. Further, a ceiling wall hole 24 into which a main body 30 of the conductive member 3 described later is inserted is formed in a semicircular cross section in the ceiling wall 21c of the first magnetic core 2a.

  In this embodiment, the magnetic core 2 covers the entire area of the surface of the coil 1, and the thermal conductivity is higher than when the coil 1 is radiated by air like a cut core with the entire area of the coil 1 exposed. The heat dissipation efficiency is high because the heat is radiated through the high magnetic core 2. In addition, since the magnetic core 2 covers the entire area of the surface of the coil 1, the water resistance is high and the leakage magnetic flux can be reduced. And since the coil 1 in this embodiment is comprised by the flatwise volume, it becomes possible to make the conducting wire 10 flat shape and can improve heat dissipation.

  On the other hand, the flat-wise coil 1 is likely to store heat in the inner conductor 10 having a small surface area in contact with the magnetic core 2 compared to the outer conductor 10. Moreover, since the inner peripheral side conductor 10 is located on the center side of the magnetic core 2, it is difficult to transfer heat to the outer surface of the magnetic core 2, and the heat dissipation efficiency with respect to the heat generation from the inner peripheral side conductor 10 is low.

  Therefore, the reactor X in the present embodiment is electrically connected to the inner peripheral side of the coil 1 (the innermost peripheral surface of the coil 1 including the inner peripheral end portion 10a of the conducting wire 10), and is connected to the outside of the magnetic core 2. A conductive member 3 having an exposed portion 31 that is exposed is provided. The exposed portion 31 has a cooling function for cooling the inner peripheral side of the coil 1. The conductive member 3 is made of a metal material made of copper, aluminum or the like having a low electrical resistivity. The surface of the conductive member 3 may be covered with an insulating covering material. In this case, it is preferable that the covering material has good heat conductivity and heat dissipation.

  Thus, the exposed portion 31 can be used also as a cooling member for cooling the coil 1 while utilizing the exposed portion 31 as a lead terminal for electrically connecting the coil 1 and other electronic components. In addition, since the conductive member 3 is electrically connected to the inner peripheral side of the coil 1, heat dissipation from the inner peripheral side of the coil 1 that is likely to store heat can be promoted via the conductive member 3. On the other hand, heat generated from the outer peripheral side of the coil 1 having a larger surface area than the inner peripheral side of the coil 1 is radiated to the outside through the magnetic core 2. Therefore, heat generated from the inner peripheral side of the coil 1 and heat generated from the outer peripheral side of the coil 1 can be efficiently radiated.

[First embodiment]
A specific configuration of the conductive member 3 according to the first embodiment will be described with reference to FIGS.

  The conductive member 3 is integrally formed with a semi-cylindrical main body 30 and an exposed portion 31 extending from the main body 30 and exposed to the outside of the magnetic core 2. The main body portion 30 includes an exposed portion 31 that includes a connection portion 30a that is electrically connected to a portion of the conductor 10 on the inner peripheral side of the coil 1 where a portion of the insulating material on the inner peripheral surface is removed and the metal material is exposed. It has on the convex-shaped outer surface in the edge part on the opposite side (refer FIG. 1 and FIG. 4). Moreover, parts other than the connection part 30a in the main body part 30 are in close contact (contact) with the inner peripheral side of the conducting wire 10 or the magnetic core 2 in an insulating state. The connecting portion 30a and the conductive wire 10 on the inner peripheral side of the coil 1 are joined by soldering, caulking, ultrasonic welding, or the like. Note that the position of the connecting portion 30 a is not limited to the end opposite to the exposed portion 31, and may be a portion that can be electrically connected to the conductive wire 10 on the inner peripheral side of the coil 1.

  The concave outer peripheral surface of the conductive member 3 and the concave outer peripheral surface intersecting the magnetic core 2 on the exposed portion 31 side are pressure-bonded with an insulating sheet having high thermal conductivity between the magnetic core 2. Or by applying silicon grease or the like having high electrical insulation. If the magnetic core 2 is insulative, the conductive member 3 may be directly attached to the magnetic core 2. Thereby, the heat storage of the columnar portions 21 a and 22 a of the magnetic core 2 can be radiated through the conductive member 3.

  Since the conductive member 3 in the present embodiment intersects the magnetic core 2 on the exposed portion 31 side, the flow of magnetic flux may be interrupted. In this case, an eddy current is generated at the intersection of the conductive member 3 with the magnetic path of the magnetic flux flowing in the magnetic core 2, and the performance of the reactor X is deteriorated. Therefore, in the present embodiment, a plurality (five in the present embodiment) of slits 30b are formed in a portion of the main body 30 that intersects the magnetic path of the magnetic flux flowing in the magnetic core 2 on the exposed portion 31 side. Has been. The plurality of slits 30b are arranged at equal intervals along the circumferential direction of the semi-cylindrical body portion 30, and are formed in a vertically long rectangular shape along the central axis C (FIGS. 1 to 2). And FIG. 4). Thereby, it becomes possible to flow magnetic flux smoothly through the slit 30b. Moreover, in the main body part 30 of the conductive member 3, it becomes possible to reduce eddy currents generated at a portion intersecting with the magnetic flux. For this reason, the performance of the reactor X can be maintained while improving the heat radiation efficiency. Note that the plurality of slits 30b may be provided irregularly along the circumferential direction of the main body 30, and the eddy current may be formed by making the slit 30b a round hole or a horizontally long rectangle. The shape which makes small is preferable. Further, by extending the main body 30 of the conductive member 3 to the lower region of the coil 1 shown in FIG. 1, the main body 30 of the conductive member 3 is configured to intersect the second magnetic core 2b. A plurality of slits 30b may be provided at the intersection.

  The exposed part 31 has a base end part 31a exposed in a semi-cylindrical shape outside the magnetic core 2 and a cooling part 31b extending in the radial direction from the base end part 31a (see FIG. 4). The base end portion 31a or a cooling fin 31c, which will be described later, functions as an extraction terminal that is electrically connected to another electronic component. The cooling portion 31b is formed on the inner peripheral side of the coil 1 and the columnar portion 21a of the magnetic core 2. , 22a and the ceiling wall 21c are cooled.

  As shown in FIG. 4, the cross-sectional area S <b> 1 on the plate thickness surface (rectangular cross section) of the main body 30 is preferably equal to the bonding area S <b> 2 where the connection portion 30 a of the main body 30 is bonded to the inner peripheral side of the coil 1. Moreover, it is preferable that the cross-sectional area S1 of the main body 30 and the joint area S2 of the connecting portion 30a are equal to the cross-sectional area S3 on the plate thickness surface (rectangular cross section) of the conducting wire 10. Thereby, the electric current which flows into the reactor X can be made constant, and the performance of the reactor X can be maintained.

  The cross-sectional area S1 of the main body 30, the joint area S2 of the connecting portion 30a and the cross-sectional area S3 of the conducting wire 10 are the electrical resistivity of the joining portion between the connecting portion 30a and the inner peripheral side of the coil 1, and the electrical resistance of the conducting wire 10. In consideration of the ratio, the electrical resistivity of the conductive member 3 and the like, it may be designed appropriately. For example, the cross-sectional area in the portion of the main body 30 where the slit 30b is provided may be equal to the cross-sectional area S2 of the connecting portion 30a and the conductor 10. Thereby, the electrical resistance of the current flowing through the coil 1 through the conductive member 3 can be further reduced, and the cooling performance on the inner peripheral side of the coil 1 can be enhanced. That is, the shape (cross-sectional shape and circumferential length) of the conductive member 3 in consideration of the electric resistance of the current flowing through the coil 1, the cooling performance of the coil 1, and the balance of securing the magnetic path of the magnetic flux flowing through the magnetic core 2. Will be determined.

  Cooling fins 31c made of the same metal material as that of the conductive member 3 are connected to the cooling unit 31b by welding, adhesion, or the like, and the contact area in contact with the outside air is increased to increase the cooling efficiency. The cooling unit 31b may be configured with a box-shaped casing, a concave-convex casing, a bellows-like rod-shaped member, or the like without the cooling fins 31c, and is not particularly limited. In addition, it is preferable that the bottom of the cooling unit 31 b is in close contact with the outer surface of the magnetic core 2. Thereby, the heat storage of the columnar portions 21a and 22a of the magnetic core 2 can be efficiently radiated.

  The procedure for assembling the reactor X will be described with reference to FIG.

  The magnetic core 2 has a first magnetic core 2a and a second magnetic core 2b, and is molded in a state of being divided into two along the vertical plane of the central axis C. Moreover, the coil 1 is wound around the central axis C around the conducting wire 10 in a spiral shape, and the outer peripheral side end portion 10b is bent outward. The main body 30 of the conductive member 3 is inserted into the top wall hole 24 of the first magnetic core 2a, and the first magnetic core 2a and the conductive member 3 are assembled. Next, the connection part 30 a of the main body part 30 is joined to the inner peripheral side of the coil 1. Next, the unit in which the coil 1, the first magnetic core 2a and the conductive member 3 are integrated is placed on the second magnetic core 2b, and the reactor X is completed.

[Second Embodiment]
A specific configuration of the conductive member 3 according to the second embodiment will be described with reference to FIGS. In addition, in order to make an understanding of drawing easy, it demonstrates using the same member name and code | symbol as embodiment mentioned above.

  The conductive member 3 in the present embodiment is formed in a cylindrical shape that is arranged over the entire inner circumference of the coil 1. That is, the conductive member 3 is integrally formed with a cylindrical main body 30 and an exposed portion 31 that extends from the main body 30 and is exposed to the outside of the magnetic core 2.

  If the conductive member 3 is arranged over the entire inner circumference side of the coil 1 as in this embodiment, the heat generated from the inner circumference side of the coil 1 can be uniformly dissipated in the circumferential direction. . Therefore, the heat dissipation efficiency through the conductive member 3 for heat generation from the inner peripheral side of the coil 1 can be further increased. Further, the top wall 21c of the magnetic core 2 in this embodiment is divided into two parts, a radially inner side and a radially outer side, so as to sandwich the cylindrical main body 30. For this reason, it is good to provide the some slit 30b along the circumferential direction of the cylindrical main-body part 30 like 1st embodiment. Thereby, the flow of magnetic flux is not hindered, and eddy current loss can be reduced.

[Third embodiment]
A specific configuration of the conductive member 3 according to the third embodiment will be described with reference to FIGS. 7 to 8. In addition, in order to make an understanding of drawing easy, it demonstrates using the same member name and code | symbol as embodiment mentioned above.

  The conductive member 3 in the present embodiment is formed of a plurality of hollow tubes whose both end portions constitute the exposed portion 31. The plurality of hollow tubes constituting the conductive member 3 are arranged at equal intervals along the outer periphery of the columnar portions 21 a and 22 a of the magnetic core 2. A refrigerant such as air (outside air) or cooling water circulates in the hollow tube. In addition, as a distribution | circulation form of a refrigerant | coolant, you may circulate using power sources, such as a pump, and you may distribute | circulate air naturally from the outside. Moreover, as the conductive member 3, a single hollow tube may be formed, or a plurality of hollow tubes may be arranged along the circumferential direction.

  If the conductive member 3 is formed of a hollow tube and the exposed portion 31 is formed at both ends of the hollow tube as in the present embodiment, the inner peripheral side of the coil 1 and the columnar portion of the magnetic core 2 21a and 22a can be actively cooled through the refrigerant | coolant which distribute | circulates a hollow tube.

[Fourth embodiment]
A specific configuration of the conductive member 3 according to the fourth embodiment will be described with reference to FIGS. 9 to 11. In addition, in order to make an understanding of drawing easy, it demonstrates using the same member name and code | symbol as embodiment mentioned above.

  In the present embodiment, a plurality (two in the present embodiment) of the coils 1 are arranged (in parallel) along the central axis C, and the inner peripheral side of each of the plurality of coils 1 (of the conductive wire 10). The innermost peripheral surface of the coil 1 including the inner peripheral end 10 a is electrically connected by the main body 30 of the conductive member 3. In the example of FIG. 9, the two coils 1 laminated along the central axis C are composed of a first coil 1a shown in FIG. 10 and a second coil 1b shown in FIG. The outer peripheral side end portion 10b of the conducting wire 10 in the first coil 1a is drawn out from a side wall hole portion 23 formed in the first outer peripheral wall portion 21b of the first magnetic core 2a. Moreover, the outer peripheral side end part 10b of the conducting wire 10 in the second coil 1b is drawn out from the side wall hole part 23 formed in the second outer peripheral wall part 22b of the second magnetic core 2b.

  In this embodiment, it is comprised so that an electric current may be input from the outer peripheral side edge part 10b of the conducting wire 10 in the 1st coil 1a, and an electric current may be output from the outer peripheral side edge part 10b of the conducting wire 10 in the 2nd coil 1b. The current input from the outer peripheral side end 10 b of the conducting wire 10 in the first coil 1 a flows clockwise to the inner peripheral side of the first coil 1 a and passes through the conductive member 3 to the inner peripheral side of the second coil 1 b. It is inputted and flows clockwise to the outer peripheral side end 10b of the conducting wire 10 in the second coil 1b. That is, the conductive member 3 functions as a connection terminal that electrically connects the inner peripheral side of the first coil 1a and the inner peripheral side of the second coil 1b in series. Note that three or more coils 1 may be laminated along the central axis C, and is not particularly limited.

  When a plurality of coils 1 are stacked along the central axis C as in the present embodiment, the magnetic flux density can be increased, so that the degree of freedom in designing the reactor X can be increased according to the required performance. it can. At this time, since the inner peripheral sides of the plurality of coils 1 are electrically connected by the conductive member 3, the main body 30 of the conductive member 3 serves as a connection terminal between the plurality of coils 1. The exposed portion 31 of the member 3 can be used as a cooling member that cools the coil 1.

[Other Embodiments]
(1) The above-described embodiments can be appropriately combined. For example, you may comprise the electroconductive member 3 in 4th embodiment with a hollow tube like 3rd embodiment.
(2) The cooling unit 31b in the above-described embodiment is not limited to the form in which the cooling fins 31c are connected. For example, the base end portion 31a of the exposed portion 31 in the first embodiment or the second embodiment protrudes from the outer surface of the magnetic core 2 by a predetermined amount in a semi-cylindrical shape or a cylindrical shape, and the base end portion 31a has a cooling function. You may have it.
(3) In the above-described embodiment, the innermost peripheral surface of the coil 1 including the inner peripheral side end portion 10a of the conductive wire 10 and the main body portion 30 of the conductive member 3 are electrically connected. You may electrically connect the innermost peripheral surface of the coil 1 which does not contain the side edge part 10a, and the main-body part 30 of the electroconductive member 3. FIG. For example, instead of the form in which the innermost peripheral surface of the coil 1 on the left side of FIG. 3 and the main body 30 of the conductive member 3 are electrically connected, the innermost peripheral surface of the coil 1 on the right side of the paper and the conductive member are used. 3 main body portions 30 may be electrically connected.
(4) In the above-described embodiment, the coil 1 and the conductive member 3 are configured separately, but the coil 1 and the conductive member 3 may be configured integrally.
(5) In the embodiment described above, the magnetic core 2 is composed of the first magnetic core 2a and the second magnetic core 2b. However, the magnetic powder is applied to the mold in which the coil 1 and the conductive member 3 are set. It is good also as the integral magnetic body core 2 which flowed and sinter-molded.
(6) The magnetic core 2 in the above-described embodiment is a pot-type core that surrounds the coil 1 so as to be sealed, but may be a so-called PQ core or EER core.

  The present invention can be used for a reactor having a flat-wise coil.

1: Coil 1a: First coil 1b: Second coil 2: Magnetic core 3: Conductive member 10: Conductive wire 30b: Slit 31: Exposed portion 31c: Cooling fin C: Center axis S: Plate surface X: Reactor

Claims (7)

A coil in which the conducting wire is wound along the longitudinal direction of the plate surface such that the plate surface of the flat conducting wire is curved;
A magnetic core surrounding the coil;
A conductive member electrically connected to the inner peripheral side of the coil,
The conductive member has an exposed portion exposed to the outside of the magnetic core,
The exposed portion is a reactor having a cooling function for cooling the coil.   The reactor according to claim 1, wherein the magnetic core has a pot shape configured to seal the coil.   The reactor according to claim 1, wherein the conductive member is connected to a cooling fin at the exposed portion.   The reactor as described in any one of Claims 1-3 in which the slit is formed in the site | part which intersects with the said magnetic body core among the said electroconductive members.   The reactor according to any one of claims 1 to 4, wherein the conductive member is formed in a cylindrical shape that is electrically connected over the entire inner circumference of the coil.   The reactor according to claim 1, wherein the conductive member is formed of a hollow tube having both end portions constituting the exposed portion. A plurality of the coils are arranged along the central axis,
The reactor according to any one of claims 1 to 6, wherein an inner peripheral side of each of the plurality of coils is electrically connected by the conductive member.

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