JP2020205364A - Electrical apparatus - Google Patents

Abstract

To provide an electrical apparatus equipped with a choke coil that can efficiently dissipate heat from the entire coil portion.SOLUTION: An electrical apparatus includes a choke coil 2 and a mounting portion 111 that supports the choke coil 2 from one of the coil axial directions Z. The choke coil 2 includes a coil portion 3 formed by winding a conductor wire 30 so as to be laminated in the coil radial direction, and a core portion 4 forming a magnetic path by sandwiching the coil portion 3 from the coil axial direction Z. The width of the conductor wire 30 in the coil axial direction Z is larger than the width in the coil radial direction. The coil bottom surface which is the surface of the coil portion 3 on the mounting portion 111 side has a contact surface that makes thermal contact with the mounting portion 111.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electrical device including a choke coil.

Some electric devices include a choke coil having a coil portion around which a conductor wire is wound and a core having a core formed by sandwiching the coil portion from the coil axial direction. The choke coil described in Patent Document 1 has a coil portion in which strip-shaped conductors are wound so as to be laminated in the thickness direction thereof. Then, the electrode terminals are connected to the winding start and winding end of the strip-shaped conductor, and the heat generated inside the coil is dissipated through the electrode terminals.

JP-A-2007-31811

However, the choke coil described in Patent Document 1 has the following problems.
Since the choke coil cools the coil portion via the electrode terminal, it is difficult to cool the entire coil portion. That is, depending on the portion of the coil portion, the heat transfer path to the electrode terminal is long, and the thermal resistance to the electrode terminal becomes large. Therefore, it becomes difficult to suppress the temperature of the entire coil portion.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an electric device provided with a choke coil capable of efficiently dissipating heat from the entire coil portion.

One aspect of the present invention is an electric device (1) having a choke coil (2) and a mounting portion (111) that supports the choke coil from one of the coil axial directions (Z).
The choke coil has a coil portion (3) formed by winding conductor wires (30) so as to be laminated in the coil radial direction.
It has a core portion (4) that sandwiches the coil portion from the coil axis direction and forms a magnetic path.
The width of the conductor wire in the coil axial direction is larger than the width in the coil radial direction.
The bottom surface of the coil (31), which is the surface of the coil portion on the side of the mounting portion, is in an electric device having a contact surface (311) that makes thermal contact with the mounting portion.

In the above electric device, the choke coil has a coil portion formed by winding conductor wires so as to be laminated in the coil radial direction. Then, the bottom surface of the coil of the coil portion is in thermal contact with the mounting portion. Therefore, the heat dissipation path to the mounting portion can be shortened over the entire coil portion. As a result, the entire coil portion can be efficiently dissipated.

As described above, according to the above aspect, it is possible to provide an electric device provided with a choke coil capable of efficiently dissipating heat from the entire coil portion.
The reference numerals in parentheses described in the scope of claims and the means for solving the problem indicate the correspondence with the specific means described in the embodiments described later, and limit the technical scope of the present invention. It's not a thing.

An exploded perspective view of the choke coil according to the first embodiment. The plan view of the inside of the electric device in Embodiment 1. A plan view of the choke coil housed in the case in the first embodiment as viewed from above in the Z direction. FIG. 5 is a plan view of the case containing the first core member, the elastic member, and the insulating member in the first embodiment as viewed from above in the Z direction. FIG. 1 is a plan view of a case containing a first core member, an elastic member, an insulating member, and a coil portion in the first embodiment as viewed from above in the Z direction (conductor lines are not shown). FIG. 3 is a cross-sectional view of a choke coil and a case corresponding to a cross section taken along the line VI-VI in FIG. FIG. 3 is a cross-sectional view of a choke coil and a case corresponding to a cross section taken along the line VII-VII in FIG. FIG. 3 is a cross-sectional view of a choke coil and a case corresponding to a cross section taken along the line VIII-VIII in FIG. A plan view of the case in the first embodiment as viewed from above in the Z direction. A plan view of the second core member in the first embodiment as viewed from below in the Z direction. The plan view of the insulator in Embodiment 1 as seen from the upper side in the Z direction. FIG. 2 is a plan view of the choke coil housed in the case as viewed from above in the Z direction in the second embodiment. FIG. 12 is a cross-sectional view of a choke coil and a case corresponding to a cross section taken along the line XIII-XIII in FIG. The perspective view of the coil part formed by winding a conductor wire α.

(Embodiment 1)
An embodiment according to the electric device 1 will be described with reference to FIGS. 1 to 11.
As shown in FIG. 2, the electric device 1 of the present embodiment has a choke coil 2 and a mounting portion 111 that supports the choke coil 2 from one of the coil axial directions Z. As shown in FIG. 1, the choke coil 2 includes a coil portion 3 formed by winding conductor wires 30 so as to be laminated in the coil radial direction, and a core portion that sandwiches the coil portion 3 from the coil axial direction Z to form a magnetic path. Has 4 and. The width of the conductor wire 30 in the coil axial direction Z is larger than the width in the coil radial direction. As shown in FIG. 7, the bottom surface 31 of the coil, which is the surface of the coil portion 3 on the mounting portion 111 side, has a contact surface 311 that is in thermal contact with the mounting portion 111.

The coil radial direction is the radial direction of the coil portion 3. Further, the coil axial direction Z is a direction parallel to the coil winding axis C of the coil portion 3. The coil axial direction Z is also appropriately referred to simply as the Z direction. Further, in the Z direction, the mounting portion 111 side is referred to as the lower side and the opposite side is referred to as the upper side with respect to the coil portion 3.

As shown in FIG. 2, the electric device 1 houses a plurality of electronic components 14 including the choke coil 2 in the case 11. The case 11 includes a mounting portion 111. The electric device 1 can be, for example, a DC-DC converter, a charger, or an inverter.

As shown in FIGS. 1 and 6, the conductor wire 30 of the coil portion 3 in the choke coil 2 is a flat wire whose surface is covered with an insulating coating (not shown). Further, the conductor wire 30 is not wound so as to be laminated in the coil axial direction Z. The conductor wire 30 of the coil portion 3 is made of, for example, copper or an alloy of copper. Further, the conductor wire 30 has a smaller thermal conductivity in the insulating coating than in the conductor portion made of copper or an alloy of copper.

As shown in FIG. 1, the conductor wire 30 is provided with electrode terminals 301 at the start and end of winding. The electrode terminal 301 projects upward in the Z direction.

As shown in FIG. 1, the coil portion 3 has a hollow portion 32 that penetrates the coil portion 3 in the Z direction.

Further, as shown in FIG. 3, the electric device 1 has a coil pressing portion 7 that presses the coil portion 3 toward the mounting portion 111 in the coil axial direction Z.

As shown in FIG. 1, the core portion 4 has a first core member 41 arranged between the coil portion 3 and the mounting portion 111. Further, the core portion 4 has a second core member 42 arranged on the side opposite to the mounting portion 111 in the coil portion 3. As shown in FIG. 6, the second core member 42 and the first core member 41 are in contact with each other in the coil axial direction Z. The second core member 42 is pressed toward the mounting portion 111 by the core pressing portion 71. Further, as shown in FIG. 3, the core pressing portion 71 and the coil pressing portion 7 are integrally formed with each other.

As shown in FIG. 1, the first core member 41 has a plate shape. Further, as shown in FIG. 4, the first core member 41 has a first concave portion 411 recessed inward from both sides in the lateral direction near the center in the longitudinal direction thereof when viewed from the Z direction.
The longitudinal direction of the first core member 41, which is orthogonal to the Z direction, is appropriately referred to as the X direction. Further, the direction orthogonal to both the Z direction and the X direction, and the lateral direction of the first core member 41 is appropriately referred to as the Y direction.

The second core member 42 and the first core member 41 have substantially the same shape when viewed from above in the Z direction. Then, as shown in FIG. 3, the second core member 42 has a second recess 421 recessed inward from both sides in the Y direction near the center in the X direction when viewed from the Z direction.

Further, the second core member 42 has a leg portion 422 as shown in FIGS. 1, 6 and 8. The legs 422 project downward from both ends of the second core member 42 in the X direction.

The lower end surface of the leg portion 422 is in contact with the first core member 41 as shown in FIGS. 6 and 8. Then, by bringing the first core member 41 and the second core member 42 into contact with each other in the Z direction, a space for accommodating the coil portion 3 is formed. Further, the second core member 42 forms a magnetic path together with the first core member 41. The first core member 41 and the second core member 42 are made of, for example, ferrite.

Further, the second core member 42 has a central protrusion 423 as shown in FIGS. 6 and 10. As shown in FIG. 10, the central protrusion 423 is formed substantially in the center of the second core member 42 when viewed from the Z direction. Further, as shown in FIG. 6, the central protruding portion 423 is formed so as to protrude downward. Further, the central protrusion 423 is not in contact with the first core member 41. The central protrusion 423 has a substantially cylindrical shape.

Further, the choke coil 2 has an insulator 8 that electrically insulates the coil portion 3 and the core portion 4. As shown in FIG. 1, the insulator 8 is arranged between the second core member 42 and the coil portion 3. As shown in FIG. 6, the insulator 8 is arranged so as to cover the coil portion 3 except for the coil bottom surface 31. The insulator 8 is made of, for example, a resin having an electrically insulating property.

As shown in FIGS. 6 and 11, the insulator 8 includes an upper wall portion 83 that covers the upper surface of the coil portion 3, an inner wall portion 831 that covers the inner peripheral surface of the coil portion 3, and an outer wall portion that covers the outer peripheral surface of the coil portion 3. It has 832. When viewed from the Z direction, the upper wall portion 83 has an annular shape. The inner wall portion 831 projects downward from the inner peripheral edge of the upper wall portion 83 and has a substantially cylindrical shape. The outer wall portion 832 projects downward from the outer peripheral edge of the upper wall portion 83 and has a substantially cylindrical shape.

As shown in FIGS. 1, 3, and 11, the upper wall portion 83 is provided with a first raised portion 81 and a second raised portion 82 that are raised upward. The first raised portion 81 and the second raised portion 82 are arranged on opposite sides in the coil radial direction. Further, the upper wall portion 83 is provided with two terminal holes 811. As shown in FIG. 3, the two electrode terminals 301 of the coil portion 3 are inserted into the two terminal holes 811 and are exposed upward. The two terminal holes 811 are provided in the first raised portion 81.

As shown in FIG. 3, the first raised portion 81 and the second raised portion 82 are arranged in the second recess 421 of the second core member 42 arranged on the upper wall portion 83 of the insulator 8. That is, when viewed from the Z direction, the second core member 42 is arranged so as to be sandwiched from the Y direction by the first raised portion 81 and the second raised portion 82. The first raised portion 81 and the second raised portion 82 are not covered from above by the second core member 42.

As shown in FIGS. 3 and 8, the upper wall portion 83 of the insulator 8 is pressed from above by the coil pressing portion 7. In the present embodiment, the coil pressing portion 7 abuts and presses against the first raised portion 81 and the second raised portion 82. As a result, the coil pressing portion 7 presses the coil portion 3 toward the mounting portion 111.

As shown in FIG. 6, the second core member 42 is pressed from above by the core pressing portion 71. That is, the core pressing portion 71 abuts on the upper surface of the second core member 42 and presses it downward. As a result, the second core member 42 is pressed toward the first core member 41. Then, the core portion 4 composed of the first core member 41 and the second core member 42, which are in contact with each other at the leg portions 422, is pressed toward the mounting portion 111. The lower surface of the first core member 41 is in contact with the support surface 13 of the mounting portion 111.

As described above, the coil pressing portion 7 is integrated with the core pressing portion 71. That is, as shown in FIG. 3, the coil pressing portion 7 and the core pressing portion 71 are composed of a part of the integrally formed pressing member 70. The integral pressing member 70 is formed by bending a metal plate made of, for example, spring steel. As shown in FIG. 3, the integral pressing member 70 has a fixing base portion 701 fixed to the case 11 and a core pressing portion 71 protruding from the fixing base portion 701 in the same direction (one of the X directions in this embodiment). And the two coil pressing portions 7 are formed so as to be branched from each other. The two coil pressing portions 7 are arranged on both sides in the Y direction with respect to the core pressing portion 71. The fixing base 701 is fixed to the case 11 by a screw 12.

The core pressing portion 71 has a pressure contact portion 711 that presses against the core portion 4 in the vicinity of the protruding end on the side far from the fixed base portion 701. The coil holding portion 7 also has a pressure contact portion 72 that presses against the insulator 8 in the vicinity of the protruding end on the side far from the fixed base portion 701. Each of the pressure contact portions 72 of the two coil pressing portions 7 is pressure contacted with the upper surfaces of the first raised portion 81 and the second raised portion 82 of the insulator 8. The pressure contact portion of the core pressing portion 71 is pressure contacted with the upper surface thereof in the vicinity of the central portion of the second core member 42.

The coil pressing portion 7 and the core pressing portion 71 are respectively configured to be elastically deformed. As a result, the coil portion 3 and the core portion 4 are configured to individually apply pressing force.

Further, the mounting portion 111 of the case 11 has two convex support portions 112 as shown in FIGS. 1 and 7 to 9. The convex support portion 112 projects upward in the Z direction to support the coil portion 3. That is, the coil portion 3 is supported by the convex support portion 112 at two locations on the bottom surface 31 of the coil. Further, as shown in FIG. 7, the height h from the support surface 13 in the Z direction to the upper surface 113 of the convex support portion 112 is larger than the thickness d of the first core member 41 in the Z direction. Therefore, the upper surface 113 of the convex support portion 112 is located above the upper end surface of the first core member 41 in the Z direction in the Z direction. That is, the upper surface 113 of the convex support portion 112 is closer to the bottom surface 31 of the coil than the upper end surface of the first core member 41 in the Z direction.
The case 11 is made of, for example, a metal such as aluminum.

As shown in FIG. 5, the contact surface 311 of the coil portion 3 is in thermal contact with the upper surface 113 of the convex support portion 112 over the entire width of the coil portion 3 in the coil radial direction. In this embodiment, the contact surface 311 is in thermal contact with the upper surface 113 of one of the convex support portions 112 over the entire width of the coil portion 3 in the coil radial direction. Further, the first concave portion 411 of the first core member 41 is formed so as to follow the shape of the convex support portion 112.

Further, as shown in FIGS. 7 and 8, an insulating member 5 having thermal conductivity is interposed between the contact surface 311 and the mounting portion 111.

Further, the insulating member 5 is interposed between the bottom surface 31 of the coil and the mounting portion 111 and the core portion 4. Further, an elastic member 6 having elasticity is interposed between the insulating member 5 and the core portion 4.

Further, the insulating member 5 has a sheet shape as shown in FIG. The insulating member 5 has a smaller thermal resistance than the elastic member 6. The insulating member 5 is made of, for example, silicon having an insulating property.

As shown in FIGS. 7 and 8, the insulating member 5 is interposed between the contact surface 311 of the bottom surface 31 of the coil and the upper surface 113 of the convex support portion 112 of the mounting portion 111. The insulating member 5 is sandwiched between the upper surface 113 of the convex support portion 112 and the bottom surface 31 of the coil from both sides thereof and is in pressure contact with each other. Further, the insulating member 5 is also interposed between the coil bottom surface 31 and the first core member 41. However, there is a gap between the insulating member 5 and the first core member 41. As shown in FIG. 4, the insulating member 5 has a substantially circular shape when viewed from the Z direction. The insulating member 5 covers the entire bottom surface 31 of the coil. The insulating member 5 insulates the bottom surface 31 of the coil from the upper surface 113 of the convex support portion 112 and the first core member 41.

Further, as shown in FIG. 7, the convex support portion 112 supports the coil bottom surface 31 of the coil portion 3 via the insulating member 5. Further, the convex support portion 112 is in thermal contact with the bottom surface 31 of the coil via the insulating member 5.

Further, as shown in FIGS. 4, 6 and 7, an elastic member 6 is interposed between the insulating member 5 and the first core member 41. The elastic member 6 has a lower elastic modulus than the insulating member 5.

As shown in FIGS. 6 and 7, the elastic member 6 has a larger thickness in the Z direction than the insulating member 5. The elastic member 6 is made of, for example, silicon having an insulating property.

Further, as shown in FIG. 5, the elastic members 6 are arranged on both sides in the X direction with the coil winding shaft C of the coil portion 3 interposed therebetween. Further, the elastic members 6 are arranged on both sides in the X direction with the hollow portion 32 of the coil portion 3 interposed therebetween.

As shown in FIG. 4, the elastic member 6 has a larger width in the Y direction than a width in the X direction when viewed from the Z direction.

Further, the elastic member 6 arranged between the coil portion 3 pressed toward the mounting portion 111 by the coil pressing portion 7 and the mounting portion 111 is elastically compressed in the Z direction, and the insulating member 5 is provided. It is interposed between the mounting portion 111 and the mounting portion 111.

Next, the action and effect of this embodiment will be described.
In the electric device 1 of the present embodiment, the choke coil 2 has a coil portion 3 formed by winding conductor wires 30 so as to be laminated in the coil radial direction. Then, the coil bottom surface 31 of the coil portion 3 is in thermal contact with the mounting portion 111 of the case 11. Therefore, the heat dissipation path to the case 11 can be shortened over the entire coil portion 3. As a result, the entire coil portion 3 can be efficiently dissipated.

Further, the contact surface 311 is in thermal contact with the upper surface 113 of the convex support portion 112 over the entire width of the coil portion 3 in the coil radial direction. Therefore, the heat dissipation path to the case 11 can be further shortened over the entire coil portion 3. As a result, the entire coil portion 3 can be dissipated more efficiently.

Further, the conductor wire 30 is not wound so as to be laminated in the coil axial direction Z. That is, the coil portion 3 is wound so that the conductor wire 30 is arranged in only one stage in the Z direction. As a result, it is possible to further suppress the occurrence of a portion of the conductor wire 30 where the heat dissipation distance to the contact surface 311 becomes long.

In the Z direction, only one layer of the insulating coating of the conductor wire 30 is interposed between each portion of the conductor wire 30 and the mounting portion 111. That is, only one layer of the insulating coating having a lower thermal conductivity than the conductor portion of the conductor wire 30 and the mounting portion 111 intervenes. Therefore, the thermal resistance of the heat dissipation path in the Z direction from the conductor wire 30 to the mounting portion 111 can be reduced. As a result, the coil portion 3 can efficiently dissipate heat as described above.

Further, since the coil portion 3 can efficiently dissipate heat, it is easy to suppress the temperature rise due to energization. Therefore, it is less necessary to increase the cross-sectional area of the conductor wire 30 for the purpose of reducing the electrical resistance. As a result, the choke coil 2 can be easily miniaturized.

Further, the conductor wire 30 is not wound so as to be laminated in the coil axial direction Z. Therefore, it is easy to reduce the width of the coil portion 3 in the Z direction. As a result, the choke coil 2 can be easily miniaturized.

Further, an insulating member 5 having thermal conductivity is interposed between the contact surface 311 and the mounting portion 111. Therefore, the insulating property between the coil portion 3 and the case 11 can be ensured, and the coil portion 3 can easily dissipate heat efficiently.

Further, the insulating member 5 is interposed between the bottom surface 31 of the coil and the mounting portion 111 and the core portion 4. An elastic member 6 having elasticity is interposed between the insulating member 5 and the first core member 41. Therefore, the elastic member 6 can absorb the dimensional variation of each component due to the elastic deformation. Therefore, each component including the coil portion 3 can be stably assembled. As a result, the contact surface 311 and the upper surface 113 of the convex support portion 112 can be reliably and thermally contacted. Further, since it is possible to form a heat dissipation path from the coil portion 3 to the insulating member 5, the insulating member 5 to the elastic member 6, the elastic member 6 to the first core member 41, and the first core member 41 to the mounting portion 111, the coil portion 3 is further formed. The heat dissipation of the coil can be improved.

Further, the elastic member 6 has a lower elastic modulus than the insulating member 5. Therefore, the elastic member 6 is easily elastically compressed. As a result, it is easier to suppress the rattling of each part.

Further, the electric device 1 has a coil holding portion 7. Therefore, the coil portion 3 can be pressed toward the mounting portion 111 in the coil axial direction Z. As a result, the contact surface 311 and the upper surface 113 of the convex support portion 112 can be reliably and thermally contacted.

Further, the coil pressing portion 7 and the core pressing portion 71 are integrally formed with each other. Therefore, the coil portion 3 and the core portion 4 can be pressed by the integrated pressing member 70, which is one member. As a result, an increase in the number of parts can be suppressed.

Further, the case 11 includes a convex support portion 112. The upper surface 113 of the convex support portion 112 is closer to the bottom surface 31 of the coil in the Z direction than the upper end surface of the first core member 41. Therefore, the contact surface 311 of the coil bottom surface 31 tends to be in thermal contact with the top surface 113 of the convex support portion 112.

Further, the coil portion 3 is formed by winding a conductor wire 30 in which the width in the coil axial direction Z is larger than the width in the coil radial direction. That is, the coil portion 3 is formed by winding a flat wire. Therefore, the space factor in the coil portion 3 can be increased, and the coil portion 3 is not easily deformed even when pressed in the coil axial direction Z. As a result, the coil portion 3 can be strongly pressed toward the mounting portion 111, so that the coil portion 3 can efficiently dissipate heat.

As described above, according to the present embodiment, it is possible to provide the electric device 1 provided with the choke coil 2 capable of efficiently dissipating heat from the entire coil portion 3.

(Embodiment 2)
As shown in FIGS. 12 and 13, the electric device 1 of the present embodiment is configured so that the insulator 8 also functions as the coil pressing portion 7.

The insulator 8 is fixed to the case 11 by a screw 12 as shown in FIGS. 12 and 13. The insulator 8 has three screw insertion holes 84. Further, as shown in FIG. 13, a bush 85 is fitted in the screw insertion hole 84. The bush 85 is made of metal in a tubular shape. Then, the insulator 8 is fastened and fixed to the case 11 by inserting the screw 12 into the screw insertion hole 84 and screwing it into the screw hole of the case 11. That is, by fastening the insulator 8 to the case 11 with the screw 12, the coil portion 3 is pressed toward the mounting portion 111 by the insulator 8. That is, the insulator 8 also functions as the coil pressing portion 7.

Further, in the electric device 1 of the present embodiment, the core pressing portion 71 is formed separately from the coil pressing portion 7.
Others are the same as in the first embodiment.
In addition, among the codes used in the second and subsequent embodiments, the same codes as those used in the above-described embodiments represent the same components and the like as those in the above-mentioned embodiments, unless otherwise specified.

In this embodiment, the coil pressing portion 7 is composed of an insulator 8. Therefore, in the choke coil 2 provided with the insulator 8, it is possible to suppress an increase in the number of parts.

Further, the insulator 8 is fastened and fixed to the case 11 by the screw 12. Therefore, the insulator 8 can press the coil portion 3 toward the mounting portion 111 with a large load. As a result, the contact thermal resistance between the coil bottom surface 31 and the mounting portion 111 can be reduced.
In addition, it has the same effect as that of the first embodiment.

In the electric device 1 of the first and second embodiments, the coil portion 3 has one winding portion 33 in which the conductor wires 30 are wound so as to be laminated in the coil radial direction. However, in the coil portion 3, a plurality of winding portions 33 may be connected in series and laminated in the coil axial direction Z.

That is, for example, as shown in FIG. 14, the coil portion 3 may be formed by winding a flat wire, which is a conductor wire 30, by so-called α winding. In this case, the coil portion 3 has two winding portions 33. The two winding portions 33 are connected by a conductor wire 30 located on the inner peripheral side of each. Further, the two winding portions 33 are laminated in the Z direction so that the respective coil winding shafts C coincide with each other. By adopting such a form, the coil portion 3 can have both of the two drawers of the conductor wire 30 on the outside. Therefore, the position of the lead-out of the conductor wire 30 connected to the electrode terminal 301 can be easily adjusted. Further, since the second recess 421 can be made smaller, the strength of the second core member 42 can be improved.

Further, in the first embodiment, the coil pressing portion 7 and the core pressing portion 71 are integrally formed with each other. However, the coil pressing portion 7 and the core pressing portion 71 may be formed separately.

Further, in the first and second embodiments, the upper surface 113 of the convex support portion 112 is arranged above the upper end surface of the first core member 41. However, the upper surface 113 of the convex support portion 112 may be on the same surface as the upper end surface of the first core member 41.

The present invention is not limited to each of the above embodiments, and can be applied to various embodiments without departing from the gist thereof.

1 Electrical device 111 Mounting part 2 Choke coil 3 Coil part 30 Conductor wire 31 Coil bottom surface 311 Contact surface 4 Core part Z Coil axial direction

Claims (6)

An electric device (1) having a choke coil (2) and a mounting portion (111) that supports the choke coil from one of the coil axial directions (Z).
The choke coil has a coil portion (3) formed by winding conductor wires (30) so as to be laminated in the coil radial direction.
It has a core portion (4) that sandwiches the coil portion from the coil axis direction and forms a magnetic path.
The width of the conductor wire in the coil axial direction is larger than the width in the coil radial direction.
An electric device having a coil bottom surface (31), which is a surface of the coil portion on the mounting portion side, having a contact surface (311) that is in thermal contact with the mounting portion. The electric device according to claim 1, wherein an insulating member (5) having thermal conductivity is interposed between the contact surface and the mounting portion. The insulating member is interposed between the bottom surface of the coil, the mounting portion, and the core portion, and an elastic member (6) having elasticity is interposed between the insulating member and the core portion. The electric device according to claim 2. The electric device according to claim 3, wherein the elastic member has a lower elastic modulus than the insulating member. The electric device according to any one of claims 1 to 4, further comprising a coil holding portion (7) that presses the coil portion toward the mounting portion in the coil axial direction. The core portion includes a first core member (41) arranged between the coil portion and the mounting portion.
It has a second core member (42) arranged on the side opposite to the mounting portion in the coil portion.
The second core member and the first core member are in contact with each other in the coil axial direction.
5. The second core member is pressed toward the mounting portion by the core pressing portion (71), and the core pressing portion and the coil pressing portion are integrally formed with each other. The electrical device described in.

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