Coil device

Abstract

The invention provides a coil device capable of realizing miniaturization and easy terminal installation, the coil device comprises a core (2) comprising a magnetic body, winding wires (4, 5) wound around at least a part of the core (2), and a terminal block (7) for holding a terminal (6) connected with lead parts (41a, 41b, 51a, 51b) of the winding wires (4, 5), the terminal block (7) is provided with an installation groove (71), and the lead parts (41a, 41b, 51a, 51b) of the winding wires (4, 5) can be connected with the installation groove (71) of the lead parts (41a, 41b, 51a, 51b) of the winding wires (4, 5). A terminal (6) of the winding wire (41a, 41b) is inserted from a direction along an X axis substantially perpendicular to a winding axis of the winding wire (41a, 41b).

Description

Technical Field

[0001] The present invention relates to a coil device used as a transformer or the like. Background Art

[0002] Patent document 1 discloses a coil device having a cylindrical bobbin, a winding portion of a winding wire arranged on the outer peripheral surface of the bobbin, and a core having a middle leg portion mounted on the bobbin. The middle leg portion is inserted into a through hole of the bobbin and is arranged radially inward of the winding portion of the winding wire formed on the bobbin. The bobbin is provided with a terminal block on which a terminal is mounted.

[0003] As also shown in Patent Document 1, in the existing coil device, the terminal connected to the lead portion of the winding is generally installed from above along the winding axis of the winding and fixed to the surface of the terminal block. Recently, the demand for miniaturization of coil devices has become higher, requiring a structure that makes the terminal block as close to the core as possible. In addition, recently, with the increase in the current of the coil device, the wire diameter of the winding has become thicker, and it is difficult to resist the rebound force caused by the elastic deformation of the winding, and to move the terminal connected to the lead portion of the winding close to the terminal block and install the terminal from above the terminal block. Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2014-93404 Summary of the invention Problems to be solved by the invention

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coil device that can be downsized and in which terminals can be easily attached. Technical solutions to the problem

[0006] In order to achieve the above-mentioned purpose, a coil device according to one embodiment of the present invention comprises: a core including a magnetic body; a winding wire arranged in a coil shape around at least a portion of the core; and a terminal block for holding a terminal having a lead portion connected to the winding wire, the terminal block having an installation groove into which the terminal having the lead portion connected to the winding wire can be inserted from a direction along a first axis substantially perpendicular to a winding axis of the winding wire.

[0007] In this coil device, even if the terminal block is brought as close to the core as possible to achieve miniaturization of the coil device, since the terminal block has a mounting groove for inserting the terminal connected to the lead portion of the winding from the direction along the first axis substantially perpendicular to the winding axis of the winding, the operation of mounting the terminal to the terminal block becomes easy. For example, even if the wire diameter of the winding is thick and the rebound force caused by the elastic deformation of the winding is strong, the terminal can be easily temporarily fixed to the terminal block by simply inserting the terminal connected to the lead portion of the winding from the direction along the first axis substantially perpendicular to the winding axis of the winding into the terminal block. Afterwards, the terminal can be easily fixed to the terminal block using an adhesive or the like.

[0008] The terminal preferably includes a connection portion to which the lead portion of the winding wire is connected, an external connection portion for connecting to an external circuit, and a terminal base portion having an insertion protrusion inserted into an insertion groove of the mounting groove. The terminal base portion is preferably located between the connection portion and the external connection portion.

[0009] Preferably, the coil device further comprises a terminal cover mounted on the terminal block in a manner that covers at least the terminal base portion mounted on the mounting groove and exposes the external connection portion. By mounting the terminal cover on the terminal block in a manner that covers the terminal base with the terminal cover, the terminal can be prevented from detaching from the mounting groove of the terminal block.

[0010] A coil device in another embodiment of the present invention comprises: a core including a magnetic body; a winding arranged in a coil shape around at least a portion of the core; and a terminal block for holding a terminal to which a lead portion of the winding is connected, the terminal having a connection portion to which the lead portion of the winding is connected, an external connection portion for connecting to an external circuit, and a terminal base portion mounted in a mounting groove of the terminal block, and a terminal cover is mounted on the terminal block in a manner that covers at least the terminal base portion and exposes the external connection portion.

[0011] In this coil device, even if the terminal block is brought as close to the core as possible to achieve miniaturization of the coil device, the terminal cover is installed on the terminal block in a manner that at least covers the terminal base portion and exposes the external connection portion, so the operation of installing the terminal to the terminal block becomes easy. For example, even if the wire diameter of the winding wire is thick and the rebound force caused by the elastic deformation of the winding wire is strong, the terminal connected to the lead portion of the winding wire can be installed in a manner that the terminal base portion of the terminal is covered by the terminal cover, and the terminal can be easily fixed to the terminal block.

[0012] Preferably, the terminal cover has a side piece covering the connection part of the terminal. The connection part is covered by the side piece to protect the connection part, reduce the risk of collision with the connection part during transportation of the coil device, and improve the reliability of the connection part.

[0013] Preferably, the terminal cover has an injection hole for injecting adhesive into the terminal base portion. By injecting adhesive into the terminal base portion of the terminal from the injection hole, the terminal cover is reliably fixed to the terminal and the terminal cover is reliably fixed to the terminal stand.

[0014] Preferably, a through hole is formed in the terminal base portion corresponding to the position of the injection hole. The adhesive injected through the injection hole passes through the through hole of the terminal base and reaches the mounting groove of the terminal block, so that the terminal is more reliably fixed to the terminal block, and the terminal cover is also more reliably fixed to the terminal and the terminal block.

[0015] Preferably, a recess is formed on the bottom surface of the mounting groove at a position corresponding to the through hole. The adhesive injected through the injection hole passes through the through hole of the terminal base and reaches and accumulates in the mounting groove of the terminal block, so that the fixation of the terminal to the terminal block becomes more reliable, and the fixation of the terminal cover to the terminal and the terminal block also becomes more reliable.

[0016] The area of ​​the recess is preferably larger than the area of ​​the through hole of the terminal. By adopting such a structure, the amount of adhesive accumulated in the recess increases, the terminal is more reliably fixed to the terminal base, and the terminal cover is more reliably fixed to the terminal and the terminal block.

[0017] In addition, when the terminal cover does not have an injection hole, or when the terminal base portion of the terminal does not have a through hole, a recessed portion may be formed on the bottom surface of the mounting groove at a position corresponding to the through hole of the terminal.

[0018] The terminal block is preferably arranged at a position covering at least a portion of the upper surface of the core. When the terminal block is fixed to the core, a bobbin is no longer required. In addition, when a bobbin is no longer required, the distance between the winding portion of the winding and the core can be reduced, and the coil device can be miniaturized and lightweight. It also helps to bring the terminal block close to the core to achieve miniaturization of the coil device.

[0019] Furthermore, the winding part and the core of the winding can be directly cooled by using heat dissipation resin, etc., without using a winding bobbin, and the heat dissipation can be improved, and the large current of the coil device can also be handled. In addition, in a coil device using a shell filled with heat dissipation resin, the shell can also be miniaturized, and the heat dissipation is particularly improved. In addition, although a winding bobbin can also be used, the terminal block is preferably as close to the core as possible to achieve miniaturization of the coil device.

[0020] Preferably, the terminal block is arranged at a position covering at least a portion of the upper surface of the core. By fixing the terminal block to the core at such a position, it helps to achieve miniaturization of the coil device and also helps to improve heat dissipation.

[0021] The winding may include at least a first winding and a second winding, the lead portion may include a plurality of lead portions, and the terminal may include a plurality of terminals.

[0022] Preferably, the terminal block is provided with terminals connected to the lead portions of the first winding and terminals connected to the lead portions of the second winding. By adopting such a structure, even if the number of terminals is large, the coil device can be easily miniaturized and heat dissipation can be improved.

[0023] The terminal block may be arranged at one end of the core along a first axis substantially perpendicular to the winding axis of the winding wire. By adopting such a structure, the coil device can be easily miniaturized and heat dissipation can be improved.

[0024] The terminal block may also include a terminal mounting portion having mounting grooves respectively engaged with the four or more terminals. By adopting such a structure, even if the number of terminals is large, the terminals can be easily installed, and the miniaturization of the coil device can be easily achieved, and the heat dissipation can also be improved.

[0025] The terminal block can also be provided continuously with the terminal mounting portion, and further comprises a core cover portion, which covers the upper surface of the core at another position different from the part of the upper surface of the core covered by the terminal mounting portion. By adopting such a structure, it is easy to install the terminal block on the upper surface of the core.

[0026] The core cover may also have a through groove that passes through a heat sink disposed in contact with the upper surface of the core. By adopting such a structure, it is easy for the heat sink to contact the upper surface of the core, and it is easy for the heat on the upper surface of the core to dissipate to the heat dissipating resin or the external atmosphere through the heat sink.

[0027] The terminal block may also include a first terminal mounting portion having mounting grooves in which terminals connected to the pair of lead portions of the first winding are respectively engaged, and a second terminal mounting portion having mounting grooves in which terminals connected to the pair of lead portions of the second winding are respectively engaged. Preferably, the first terminal mounting portion and the second terminal mounting portion are respectively arranged at both ends of the core along a first axis substantially perpendicular to the winding axis of the winding.

[0028] By adopting such a structure, when the number of terminals is large, the number of terminals installed in each terminal block mounting portion can be reduced, for example, it is easy to align the position of the terminals installed in each terminal block mounting portion with the position of the recess formed in the core, etc. As a result, the miniaturization of the coil device is further improved.

[0029] The first terminal mounting portion and the second terminal mounting portion may be provided separately or connected as one through an intermediate core cover portion. Preferably, the intermediate core cover portion covers the central portion of the upper surface of the core between the first terminal mounting portion and the second terminal mounting portion. By adopting such a structure, it is easy to simultaneously position and install two terminal mounting portions on the upper surface of the core. In addition, it is also helpful to achieve miniaturization of the coil device.

[0030] The intermediate core cover may also have a through groove that passes through a heat sink disposed in contact with the upper surface of the core. By adopting such a structure, it is easy for the heat sink to contact the upper surface of the core, and it is easy for the heat on the upper surface of the core to be dissipated to the heat dissipating resin or the external atmosphere through the heat sink.

[0031] The intermediate core cover portion may also have at least one of a through hole extending from the inner surface of the intermediate core cover portion to the outer surface and a concave-convex portion formed on the outer surface. Forming the through hole and / or the concave-convex portion in the intermediate core cover portion helps prevent the terminal block including the core cover portion from warping, and also helps achieve lightweighting of the coil device and improved cooling efficiency.

[0032] The terminal block may also have a bent piece that enters a recess formed on a side of the core. By adopting such a structure, it is easy to position or fix the terminal block on the core, and the miniaturization and heat dissipation of the coil device are improved.

[0033] Preferably, the bent piece is integrated with the terminal block in such a manner that the connection portion of the terminal enters the interior of the recessed portion of the core. By adopting such a structure, the miniaturization and heat dissipation of the coil device can be improved.

[0034] A partition plate may be disposed between one end of the winding portion of the winding wire in the winding axis direction and the core. The partition plate may also be insulating, in which case the insulation between the core and the winding portion of the winding wire is improved. The partition plate may be combined with a terminal block, or a base portion holding the core may be sandwiched between the terminal block and the partition plate. Preferably, a through hole is formed in the partition plate for the middle leg of the core to pass through.

[0035] Preferably, the core has a middle leg portion disposed through the winding portion of the winding wire. In addition, the core may further have a side leg portion covering at least a portion of the outer circumference of the first winding portion or the outer circumference of the second winding portion.

[0036] The device may further include a housing for accommodating at least a portion of the winding portion of the winding wire. Preferably, the housing is filled with a heat dissipating resin to a position where at least a portion of the winding portion of the winding wire is immersed. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1It is a schematic perspective view of a coil device according to an embodiment of the present invention. Figure 2A Yes, take it off Figure 1 A schematic perspective view of the coil device behind the housing is shown. Figure 2B yes Figure 2A A schematic exploded perspective view of the coil device shown. Figure 2C yes Figure 2B A schematic exploded perspective view of the terminal block shown. Figure 3 From a different perspective Figure 2C A perspective view of the terminal block body shown. Figure 4 It is a schematic perspective view of a coil device according to another embodiment of the present invention. Figure 5 Yes, take it off Figure 4 A schematic perspective view of the coil device behind the terminal cover is shown. Figure 6 yes Figure 4 A schematic exploded perspective view of the coil device shown. Figure 7 Yes means Figure 6 A schematic exploded perspective view showing the relationship between the terminal block and the partition plate shown. Figure 8 It is a schematic perspective view of a coil device according to still another embodiment of the present invention. Fig. 9 yes Figure 8 A schematic exploded perspective view of the coil device shown. Fig.10 is from Figure 8 The coil device shown is a three-dimensional view of the coil device with the core and the heat dissipation cover removed. Fig.11 is from Fig.10 The coil device shown is an exploded perspective view of the coil device with the terminal cover removed. Fig.12 From a different perspective Fig.11 An exploded perspective view of the coil device shown. Fig.13 is from Figure 8 The coil device shown is a perspective view of the coil device in which the terminal block is removed and the terminal cover is omitted. Fig.14 It means along Figure 8 This is a cross-sectional view of the main parts showing the relationship between the terminal cover, terminals, and terminal block of the coil device shown in FIG. XIV-XIV. Fig.15 It is a schematic perspective view of a coil device according to still another embodiment of the present invention. Fig.16 is from Fig.15 The coil device shown is a schematic exploded perspective view in which a terminal cover of a terminal block is removed. Fig.17 This is an exploded perspective view of a core and a heat sink used in a coil device according to still another embodiment of the present invention. Fig.18 This is an exploded perspective view of a core and a heat sink used in a coil device according to still another embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present invention with reference to the accompanying drawings. In addition, the contents of the drawings are merely for the purpose of illustrating and illustrating the present invention, and the appearance and dimensional ratios may be different from the actual objects. In addition, the present invention is not limited to the following embodiments.

[0039] (First embodiment) Figure 1 The coil device 1 involved in the embodiment of the present invention shown functions as a magnetic leakage transformer, for example, and is used in a vehicle charger and a power supply circuit of various electrical equipment. The coil device 1 has a core 2, a first winding 4, a second winding 5, a terminal block 7 and a housing 8. In addition, in the figure, the X-axis, the Y-axis and the Z-axis are perpendicular to each other, and the Z-axis is parallel to the height direction of the coil device 1 (the winding axis direction of the coil). In the following description, with respect to each axis of the X-axis, the Y-axis and the Z-axis, the direction toward the center of the coil device 1 is referred to as the inner side, and the direction away from the center of the coil device 1 is referred to as the outer side.

[0040] like Figure 2A As shown in FIG. 1 , the coil core assembly 3 includes a core 2, a first winding 4, a second winding 5, and a terminal block 7 having a terminal 6. Figure 2A in, omit Figure 1 FIG. 9 is a diagram of the heat sink 9 shown in FIG. Figure 2B As shown, in the present embodiment, the core 2 can be decomposed into a first core 21 arranged on the lower side along the Z axis and a second core 22 arranged on the upper side of the first core 21 along the Z axis.

[0041] In the present embodiment, the first core 21 and the second core 22 are respectively composed of E-type cores having a substantially E-shaped cross section parallel to the plane containing the Z axis and the Y axis, and have the same shape as each other, but may also be different from each other. For example, one core may be an E-type core and the other may be an I-type core. In addition, in the present embodiment, the core 2 is composed of a combination of cores 21 and 22 divided into two parts, but is not limited to being divided into two parts, and for example, may also be composed of a combination of cores divided into three parts or four or more parts.

[0042] In the present embodiment, the first core 21 includes a base portion 21a having a bottom surface parallel to a plane including the X-axis and the Y-axis, a middle leg portion 21b extending from the center of the base portion 21a toward the upper side along the Z-axis, and a pair of side leg portions 21b extending from both ends along the Y-axis of the base portion 21a toward the upper side along the Z-axis. In addition, the second core 22 includes a base portion 22a having an upper surface parallel to a plane including the X-axis and the Y-axis, a middle leg portion 22b extending from the center of the base portion 22a toward the lower side along the Z-axis, and a pair of side leg portions 21b extending from both ends along the Y-axis of the base portion 22a toward the lower side along the Z-axis.

[0043] There is no particular limitation on the cores 21 and 22 as long as they are magnetic cores, and they may be made of, for example, ferrite, metal magnetic body, or magnetic powder-containing resin. In this embodiment, the front end of the middle leg 21b is in contact with the front end of the middle leg 22b, and the front end 21c1 of the side leg 21c is in contact with the front end 22c1 of the side leg 22c. However, in other embodiments, the front end of the middle leg 21b may not be in direct contact with the front end of the middle leg 22b, but a slit may be formed between them. In the slit, you can enter Figure 1 The heat dissipating resin 82 shown may be interposed with other members.

[0044] After the coil body 30 is installed between the two cores 21 and 22, they can be integrated using an adhesive, or can be integrated using a fixing tape or the like, or can be combined and integrated. As an adhesive, a resin material with good thermal conductivity, such as heat dissipation lubricating oil, can also be used.

[0045] like Figure 2B As shown, in the present embodiment, the coil core assembly 3 includes a core 2 having a first core 21 and a second core 22, a coil body 30, and a terminal block 7 having a terminal 6. The coil body 30 includes a first winding winding portion 40 on which a first winding 4 is wound in a coil shape, a second winding winding portion 50 on which a second winding 5 is wound in a coil shape, and a spacer 10 arranged between these winding portions. In the present embodiment, the second winding winding portion 50 is arranged on the upper side along the Z axis of the first winding winding portion 40, but the opposite may be true. In the present embodiment, for example, the first winding winding portion 40 becomes a primary coil of a transformer, and the second winding winding portion 50 becomes a secondary coil of a transformer, but the opposite may be true.

[0046] In the present embodiment, the first winding 4 and the second winding 5 are respectively composed of self-welding conductive wires of a welding layer and an insulating layer. The type of the conductive wire is not particularly limited, and it is a conductive core wire such as a round wire, a flat wire, a stranded wire, a twisted wire, a braided wire, etc. The material of the welding layer or the insulating layer covering the core wire is not particularly limited, and examples thereof include polyurethane, polyamide-imide, polyimide, polyester, etc. In the present embodiment, the first winding portion 40 wound with the first winding 4 and the second winding portion 50 wound with the second winding 5 are preferably formed in advance into a coil shape, and are preferably provided in the form of an air-core coil before being integrated with the spacer 10.

[0047] In addition, in the present embodiment, the first winding 4 and the second winding 5 are both composed of self-welding type windings, but only one of the windings may be a self-welding type winding, or both may be composed of other windings. In addition, at least one of the first winding winding portion 40 and the second winding winding portion 50 may be a flat coil. The wire diameters of the first winding 4 and the second winding 5 may be the same or different, and both are not particularly limited, but are preferably within the range of 1.0 to 3.0 mm, for example.

[0048] Lead portions 41a and 41b are formed at both ends of the first winding 4 constituting the first winding winding portion 40, respectively. Each lead portion 41a and 41b extends upward along the Z axis from the first winding portion 40 and is connected to the terminals 6 and 6, respectively. In addition, lead portions 51a and 51b are formed at both ends of the second winding 5 constituting the second winding winding portion 50, respectively. Each lead portion 51a and 51b extends upward along the Z axis from the second winding portion 50 and is connected to the terminals 6 and 6, respectively.

[0049] A plurality of terminals 6 to which the plurality of lead portions 41a, 41b, 51a, and 51b are respectively connected are mounted on a terminal block 7. The terminal block 7 has a terminal cover 70, and by mounting the terminal cover 70 on the terminal block 7, the plurality of terminals 6 are fixed along the Y-axis at a predetermined interval along the long side direction of the terminal block 7. The terminal block 7 and the terminal cover 70 are preferably made of insulating members such as synthetic resins, and may be made of the same insulating material or different insulating materials. In the present embodiment, the terminal block 7 is directly fixed to the core 2. There is no particular limitation on the technical means for directly fixing the terminal block 7 to the core 2, and examples thereof include bonding, welding, and fixing with tape, including all fixing technical means other than fixing with a bobbin.

[0050] like Figure 2C As shown, in this embodiment, the plurality of terminals 6 have the same shape, and include a terminal base portion 60, a connection portion 61 provided at one end along the X-axis of the terminal base portion 60, and an external connection portion 62 provided at the other end along the X-axis of the terminal base portion 60. The connection portion 61 is connected by riveting, thermal compression, laser welding, or welding. Figure 2B The external connection portion 62 is a portion connected to an external connection terminal (not shown) or a terminal connection recess of a circuit board.

[0051] The terminal 6 having a connection portion 61, a terminal base portion 60, and an external connection portion 62 can be formed by, for example, stamping a metal plate. The connection portion 61 is bent approximately 90 degrees downward along the Z axis relative to the base portion 60, and the external connection portion 62 is bent approximately 90 degrees upward along the Z axis relative to the base portion 60. In the terminal base portion 60, the insertion protrusion 60a is formed on a plane that is flush with the base portion 60 on both sides (or on one side) along the Y axis.

[0052] The terminal base portion 60 of each terminal 6 is respectively installed from the outside along the X-axis to a plurality of mounting grooves 71 provided at predetermined intervals along the Y-axis direction on the terminal block 7, and the insertion protrusion 60a of the terminal 6 is inserted into the insertion groove 71a formed in the mounting groove 71 along the X-axis. The opening end of the insertion groove 71a is formed at the outer end along the X-axis of the mounting groove 71 formed on the upper surface of the terminal block 7 along the Z-axis, so that the insertion protrusion 60a of the terminal 6 can be inserted therefrom.

[0053] Stopper walls 71b are formed at the inner ends of the mounting grooves 71 along the X-axis. The base portion 60 of the terminal 6 inserted from the outer side of the X-axis along the bottom surface of the mounting groove 71b abuts against the stopper wall 71b at the intersection with the external connection portion 62, and the base portion 60 is positioned relative to the mounting groove 71b along the X-axis. In addition, the base portion 60 of the terminal 6 is also positioned relative to the mounting groove 71b along the Y-axis and the Z-axis because its insertion protrusion 60a is engaged with the insertion groove 71a.

[0054] On the bottom surface of each mounting groove 71, a recess 71c is formed at a position corresponding to the through hole 60b of the base portion 60 in a state where the base portion 60 of the terminal 6 is positioned in the mounting groove 71. The recess 71c has an area larger than the opening area of ​​the through hole 60b in a manner that can accommodate the through hole 60b of the terminal 6 when viewed from the upper direction along the Z axis, and is further recessed in the downward direction along the Z axis from the bottom surface of the insertion groove 71. In the present embodiment, the recess 71c can retain the adhesive injected from the through hole 60b. In addition, in the present embodiment, the recess 71c is open to the outside at the outer end along the X axis, but it can also be a closed recess.

[0055] The terminal block 7 includes a plate-shaped terminal mounting portion 72 having a mounting groove 71 formed on an outer surface 72c, a pair of flat plates 73 extending downward along the Z axis from both ends along the Y axis of the terminal mounting portion 72, and a bent plate 74 connecting the pair of flat plates in an integrated manner. Figure 3 As shown, the bent piece 74 of the terminal block 7 has the same Figure 2B The inner surface convex portion 74a has a shape that matches (matches) the surface of the concave portion 22a1 formed at the end portion along the X-axis of the base portion 22a of the second core 22 shown in FIG. Figure 2B The inner surface 73a of the side leg portion 22c of the second core 22 shown has a shape that matches the planar shape of the side end surface 22c2 along the X-axis.

[0056] Figure 3 The inner surface 72a of the terminal mounting portion 72 of the terminal block 7 shown is mounted on Figure 2B The upper surface of the base portion 22a of the second core 22 shown can be fixed by, for example, an adhesive. Figure 3 The inner surface 74a of the bent piece 74 of the terminal block 7 shown in FIG. Figure 2B The recessed portion 22a1 of the base portion 22a of the second core 22 shown is fitted therein. Figure 3 The inner surface 73a of the flat plate 73 of the terminal block 7 shown can be Figure 2B The side end surface 22c2 of the side leg portion 22c of the second core 22 shown is in close contact. In the present embodiment, the terminal block 7 can be directly fixed to the core 2 (specifically, the second core 22) without using a bobbin.

[0057] like Figure 2B As shown in FIG. 1 , the terminal cover 70 mounted on the terminal block 7 has a holding piece 70a at both ends in the Y-axis direction and a claw portion 70b at the front end. Figure 3 As shown in the figure, the terminal cover 70 can be fixed to the terminal block 7 by engaging with the inner recessed portions 72 b provided at both ends along the Y axis of the terminal mounting portion 72 of the terminal block.

[0058] like Figure 1 As shown, the housing 8 has a substantially rectangular bottom plate 80 and side plates 81 that rise upward along the Z axis from four sides of the bottom plate 80 to form a bottomed storage space inside, and an upper opening is formed at the upper portion along the Z axis. The housing 8 is preferably made of a metal such as aluminum having excellent thermal conductivity, but may also be made of resin.

[0059] In the portion above the lower half of the coil core assembly 3 inside the housing 8, the liquid level of the heat dissipating resin 82 filled into the housing 8 is preferably at least at a position where the lower half of the first winding part 40 and the second winding part 50 are filled with the heat dissipating resin 82. Further, it is preferred that the liquid level of the heat dissipating resin 82 filled into the housing 8 is at least at a position where the first winding part 40 and the second winding part 50 are filled with the heat dissipating resin 82.

[0060] The heat dissipation resin 82 is also called a potting resin, and is composed of silicone resin, polyurethane resin, epoxy resin, etc. that is soft even after injection. The longitudinal elastic modulus of the potting resin is preferably 0.1 to 100 MPa. In this embodiment, for example, the heat generated by the first winding portion 40, the second winding portion 50, and the core 2 can be efficiently dissipated from the bottom of the shell 8 to the outside through the heat dissipation resin 82 and the shell 8, thereby improving the cooling efficiency of the coil device 1. In addition, the heat dissipation resin 82 can be pre-filled into the interior of the shell 8 to accommodate Figure 2A The core-coil assembly 3 shown in the figure may also be accommodated in the housing 8. Figure 2A The core-coil assembly 3 shown in the figure is then filled with heat-dissipating resin 82 into the interior of the case 8 .

[0061] like Figure 2B As shown, a spacer 10 is disposed between the first winding portion 40 and the second winding portion 50. The spacer 10 has a predetermined thickness along the winding axis (Z axis) of the first winding portion 40 and the second winding portion. The predetermined thickness is not particularly limited, and is, for example, 0.2 to 2.0 mm.

[0062] In this embodiment, the spacer 10 is preferably fixed to the upper end of the first winding part 40 and / or the lower end of the second winding part 50 by means of thermal compression or bonding. Preferably, they are thermally compressed in the axial direction with a thermal compression layer covering the outer periphery of the windings 4 and 5 constituting the winding parts 40 and 50.

[0063] In the present embodiment, the spacer 10 is recessed from the outer peripheral position of the spacer 10 to the inner peripheral position, and has a plurality of outer recessed portions along the circumferential direction that do not contact the upper end portion of the first winding portion 40 along the Z axis and the lower end portion of the second winding portion 50 along the Z axis. In addition, the spacer 10 is recessed from the inner peripheral position of the spacer 10 to the outer peripheral position, and has a plurality of inner recessed portions along the circumferential direction that do not contact the upper end portion of the first winding portion 40 along the Z axis and the lower end portion of the second winding portion 50 along the Z axis.

[0064] In this embodiment, both the outer circumference and the inner circumference of the annular spacer 10 have a repeated concave-convex shape, and the outer concave portion and the inner concave portion are alternately arranged along the circumferential direction. The number of repetitions of the outer concave portion or the inner concave portion along the circumferential direction is not particularly limited, but is preferably 3 to 20, and more preferably about 5 to 15.

[0065] The outer recess and the inner recess may be grooves formed on the surface or back of the spacer 10 , but in the present embodiment, they are cutouts alternately formed on the outer and inner circumferences of the annular spacer, thereby penetrating the surface and back of the spacer 10 .

[0066] Therefore, the outer concave portion functions as an outer flow path that allows the flow of the fluid from the outer side to the inner side of the upper end of the first winding winding portion 40 or the lower end of the second winding winding portion 50 in the radial direction (including reverse flow), and also functions as an axial flow path that allows the flow of the fluid along the Z axis. In addition, the inner concave portion functions as an inner flow path that allows the flow of the fluid from the inner side to the outer side of the winding portions 40, 50 in the radial direction (including reverse flow), and also functions as an axial flow path that allows the flow of the fluid along the Z axis.

[0067] In this embodiment, the width of the outer concave portion along the circumferential direction is preferably wider at the outer circumferential position than at the inner circumferential position, and the width of the inner concave portion along the circumferential direction is preferably wider at the inner circumferential position than at the outer circumferential position. In addition, under the condition that the radial positions are the same, the width of the outer concave portion along the circumferential direction is preferably wider than the width of the inner concave portion along the circumferential direction, but the two may be the same or opposite.

[0068] In addition, in the present embodiment, the spacer 10 is formed in a continuous annular shape along the circumferential direction, but it is not necessarily continuous, and it may have a discontinuous portion (disconnected portion) penetrating the outer circumference and the inner circumference at one or more places in the circumferential direction. For example, in the present embodiment, all the inner recesses are continuous with the outer recesses along the circumferential direction, but it may have a disconnected portion penetrating the outer circumference and the inner circumference at any one or more inner recesses or outer recesses.

[0069] The outer peripheral portion of the spacer 10 having the largest outer diameter in the radial direction is designed to be close to the inner peripheral surface of the side leg portion 21C or 22c of the core 2, and preferably protrudes outwardly compared with the outer peripheral surface of the winding portion 40 or 50, but it may not protrude, and may be a single surface. By making the outer peripheral portion of the spacer 10 protrude outwardly compared with the outer peripheral surface of the winding portion 40 or 50, the contact between the winding portions 40 and 50 can be effectively suppressed.

[0070] In addition, the inner peripheral portion of the spacer 10, which has the smallest inner diameter in the radial direction, is designed to be close to the outer peripheral surface of the middle leg portion 21b or 22b of the core 2, and preferably protrudes inwardly compared with the inner peripheral surface of the winding winding portion 40 or 50, but it may not protrude, and may be a single surface. The inner peripheral portion may also be in contact with the outer peripheral surface of the middle leg portion 21b or 22b of the core 2. In the case of contact, the heat from the middle leg portion 21b or 22b of the core 2 is easily transferred to the spacer, and the heat dissipation is improved.

[0071] The inner circumference of the winding portion 40 or 50 may have a gap with the outer circumference of the middle leg portion 21b or 22b of the core 2, or may be in close contact with the inner circumference of the winding portion 40 or 50. Figure 1The heat dissipating resin 82 shown is interposed in the gap, and the heat dissipation of the outer peripheral surfaces of the middle leg portions 21 b and 22 b and the inner peripheral surfaces of the winding portions 40 and 50 is improved.

[0072] In the coil device 1 according to the present embodiment, a spacer 10 having a predetermined thickness is disposed between the first winding portion 40 and the second winding portion 50, so that the distance between the upper end of the first winding portion 40 and the lower end of the second winding portion 50 can be controlled by the thickness of the spacer 10. As a result, the magnetic flux leakage of the coil device 1 can be adjusted.

[0073] Furthermore, in the coil device 1 according to the present embodiment, the spacer 10 having a predetermined thickness has the outer concave portion corresponding to the outer flow path and the axial flow path, and the inner flow path corresponding to the inner flow path and the axial flow path.

[0074] The outer recessed portion allows the heat-dissipating resin 82, which is a cooling fluid, to be introduced between the first winding winding portion 40 and the second winding winding portion 50 from the outer side to the inner side in the radial direction of the winding portions 40 and 50. The inner recessed portion of the spacer 10 allows the heat-dissipating resin 82 to be introduced between the first winding winding portion 40 and the second winding winding portion 50 from the inner side to the inner side in the radial direction of the winding portions 40 and 50, or from the outer side to the inner side.

[0075] Furthermore, in the present embodiment, spiral recesses are formed at the upper end of the winding portion 40 and the lower end of the winding portion 50, which are consistent with the spiral shape of the winding wire 4 or 5 constituting the winding portions 40 and 50, respectively, and are continuous in the circumferential direction. The heat dissipating resin 82 introduced into the inner side of the winding portion 40 or 50 through the outer recesses can also flow into the inner recesses located next to the winding portion 40 or 50 through the spiral recesses, for example. Alternatively, it can also flow from the inner recess of the shield located in the circumferential direction to the outer recesses through the spiral recesses.

[0076] Furthermore, since the outer and inner recesses of the spacer 10 are axial through grooves that do not contact both the first winding portion 40 and the second winding portion, the heat dissipating resin is allowed to flow along the Z-axis direction. Figure 1 The heat dissipating resin 82 shown can be introduced between the winding parts 40 and 50 to transfer heat from the inner circumference of the winding parts 40 and 50 where heat is most easily accumulated to the housing 8 via the spacer 10 and the heat dissipating resin 82 located in the recessed part thereof, thereby improving the heat dissipation of the coil device 1.

[0077] In addition, in the present embodiment, the outer recess and the inner recess formed in the spacer 10 are also a plurality of flow path forming regions which are not in contact with the upper end of the winding portion 40 and the lower end of the winding portion 50 except for the members constituting the spacer 10. Furthermore, the plurality of flow path forming regions exist at a plurality of positions along the circumferential direction of the spacer 10.

[0078] On the surface of the spacer 10, there is no flow path forming area of ​​the member constituting the spacer 10, and the flow path forming area is arranged at multiple locations along the circumferential direction. Therefore, the heat dissipating resin as a cooling fluid can be introduced between the winding winding parts 40 and 50 at multiple locations along the circumferential direction, and the heat dissipation of the coil device 1 is further improved. In addition, even if the flow path forming area is formed at multiple locations along the circumferential direction, since the spacer 10 has a predetermined thickness, the magnetic flux leakage of the coil device 1 can be well maintained.

[0079] In addition, in this embodiment, the circumferential width of the outer recess is wider at the outer circumference than at the inner circumference, thereby making it easier to introduce the heat-dissipating resin 82 from the radial outside to the inside of the winding part 40 or 50 between the winding parts 40 and 50 .

[0080] Furthermore, the width of the inner concave portion of the spacer 10 along the circumferential direction is wider at the inner circumferential position than at the outer circumferential position, thereby making it easy to introduce the heat dissipating resin 82 from the inner side to the outer side of the winding portion 40 or 50 between the winding portions 40 and 50. Alternatively, the heat dissipating resin 82 can be introduced from the outer side to the inner side of the winding portion 40 or 50 between the winding portions 40 and 50 along the outer concave portion, and the heat dissipating resin 82 can be retained at the inner circumferential position where the width of the inner concave portion is wide, thereby improving the heat dissipation from the inner side of the winding portion 40 or 50 and the outer circumferential surface of the middle leg portion 21b or 22b of the core 2.

[0081] In the present embodiment, the inner recess and the outer recess are arranged adjacent to each other in the circumferential direction, so that the heat dissipating resin can be introduced into the space between the winding portions 40 and 50 in both directions, from the inner side to the outer side and from the outer side to the inner side of the winding portion 40 or 50 in the radial direction, thereby further improving the heat dissipation. In addition, for example, the heat dissipating resin 82 can also flow between the adjacent inner recess and the outer recess by forming a spiral recess at the upper end of the winding portion 40 or the lower end of the winding portion 50.

[0082] Furthermore, in the present embodiment, the width of the outer recessed portion along the circumferential direction is wider than the width of the inner recessed portion along the circumferential direction. The middle legs 21b and 22b of the core 2 are closely arranged in the inner circumferential portion that becomes the central opening of the spacer 10, so that the heat dissipating resin 82 flows from the outer side to the inner side of the spacer 10 in the radial direction more easily than the heat dissipating resin 82 flows from the inner side to the outer side of the spacer 10 in the radial direction. Therefore, by making the width of the outer recessed portion along the circumferential direction wider than the width of the inner recessed portion along the circumferential direction, it is easier to introduce the heat dissipating resin 82 between the winding portions 40 and 50.

[0083] Furthermore, in the present embodiment, at least one of the first winding 4 constituting the first winding winding portion 40 and the second winding 5 constituting the second winding winding portion 50 is formed of a conductor covered with an insulating layer having at least a heat-welding layer. By adopting such a structure, it is easy to heat-weld the parts of the winding 4 or 5 that are in contact with each other for each winding turn, and it is easy to form an air-core coil formed by winding the winding 4 or 5 in a coil shape. In addition, it is easy to manufacture the coil body 30 in which the first winding winding portion 40, the spacer 10 and the second winding winding portion 50 are integrated by heat-pressing them in the winding axis direction in a state where the first winding winding portion 40, the spacer 10 and the second winding winding portion 50 are combined.

[0084] In the present embodiment, the spacer 10 may also be composed of an insulating member and / or a metal member. Examples of the insulating member include synthetic resin, ceramic, glass, etc. When the spacer 10 is composed of an insulating member, the insulation between the first winding portion 40 and the second winding portion 50 is also improved. In particular, when ceramics are used, since it is not easy to deform even when used at high temperatures, it is easy to stabilize the coil characteristics independently of the temperature.

[0085] When the spacer 10 is formed of a metal component, the thermal conductivity of the spacer 10 itself becomes better, and the heat dissipation is further improved. In addition, when the spacer 10 is formed of a metal component, the windings 4 and 5 are preferably windings covered with an insulating film. In addition, the spacer 10 can also be formed of a composite component of a metal component and an insulating component. For example, the spacer component 10 can also be a component obtained by coating the surface of a metal plate with an insulating component such as a resin. Alternatively, the spacer 10 can also be formed of an insulating component in which metal powder is dispersed.

[0086] In particular, in this embodiment, Figure 2A As shown in FIG. 1 , the terminal block 7 is directly fixed to the upper surface of the second core 22, so there is no need to use a winding bobbin. In addition, since there is no need to use a winding bobbin, it is possible to reduce Figure 2B The distances between the winding parts 40 and 50 of the winding wire and the core 2 shown can achieve miniaturization and weight reduction of the coil device 1 .

[0087] Furthermore, the winding portions 40, 50 of the winding and the core 2 can be directly cooled by using the heat dissipation resin 82 or the like without using a bobbin, thereby improving the heat dissipation and coping with the large current of the coil device 1. In addition, the coil device 1 using the housing 8 filled with the heat dissipation resin 82 can also achieve miniaturization of the housing 8 and further improve the heat dissipation.

[0088] In particular, in this embodiment, Figure 2AAs shown, the terminal block 7 is arranged at a position covering at least a portion of the upper surface of the core 2. By fixing the terminal block 7 to the core 2 at such a position, the coil device 1 can be made smaller and the heat dissipation can be improved.

[0089] In addition, if Figure 2B As shown, terminals 6, 6 connected to the lead portions 41a, 41b of the first winding 4 and terminals 6, 6 connected to the lead portions 51a, 51b of the second winding 5 are mounted on the terminal block 7. By adopting such a structure, even if the number of terminals 6 is large, it is easy to miniaturize the coil device 1 and it is also possible to improve heat dissipation.

[0090] Furthermore, the terminal block 7 is provided at one end of the core 2 along the X axis substantially perpendicular to the winding axis (Z axis) of the windings 4 and 5. With such a structure, the coil device 1 can be easily miniaturized and heat dissipation can be improved.

[0091] like Figure 2C As shown, the terminal block 7 includes a terminal mounting portion 72 having mounting grooves 71 for respectively engaging four or more terminals 6. By adopting such a structure, even if the number of terminals 6 is large, the terminals 6 can be easily installed, and the coil device 1 can be easily miniaturized and heat dissipation can be improved.

[0092] In addition, if Figure 3 As shown, the terminal block 7 has an entry Figure 2B The bent piece 74 of the recessed portion 22a1 is shown formed on the side of the second core 22. By adopting such a structure, the positioning and fixing of the terminal block 7 to the core 2 becomes easy, and the miniaturization and heat dissipation of the coil device 1 can be improved.

[0093] Furthermore, in this embodiment, even if the terminal block 7 is brought close to the core 2 to achieve miniaturization of the coil device 1, it is easy to mount the terminals 6 connected to the lead portions 41a, 41b, 51a, and 51b of the windings 4 and 5 on the terminal block 7. This is because the terminal block 7 has a mounting groove 71 that can be inserted from the direction along the X-axis that is substantially perpendicular to the winding axis of the windings 4 and 5.

[0094] For example, even when the wire diameter of the windings 4 and 5 is thick and the rebound force caused by the elastic deformation of the windings 4 and 5 is strong, the terminal 6 connected to the lead parts 41a, 41b, 51a, and 51b of the windings 4 and 5 can be inserted into the terminal block 7 from the direction along the X axis so that the insertion protrusion 60a of the base part 60 is engaged with the insertion groove 71a, thereby easily temporarily fixing the terminal 6 to the terminal block 7. After that, the terminal 6 can be easily fixed to the terminal block 7 by pouring an adhesive from the through hole 60b into the recessed part 71c formed on the bottom surface of the mounting groove 71b.

[0095] In the present embodiment, the terminal cover 70 is mounted on the terminal block 7 to cover at least the terminal base portion 60 mounted in the mounting groove 71 and expose the external connection portion 62 , thereby effectively preventing the terminal 6 from being removed from the mounting groove 71 of the terminal block 7 .

[0096] (Second embodiment) like Figures 4 to 7 As shown, the coil device 1A according to the present embodiment differs from the coil device 1 according to the above-mentioned embodiment only in the following structures and effects, and the description of the common structures and effects will be omitted. Figures 4 to 7 In, with Figure 1 to Figure 3 The same components as shown are denoted by the same reference numerals, and description of overlapping parts is omitted.

[0097] like Figure 4 As shown in FIG. 1 , the terminal block 7A of the present embodiment has a core cover portion 75. The core cover portion 75 is as shown in FIG. Figure 5 As shown in the figure, it is formed continuously with the terminal mounting portion 72 to cover the upper surface of the core 2 at another position different from the portion of the upper surface of the core 2 along the Z axis covered by the terminal mounting portion 72. On the inner surface of the core cover portion 75, a through groove 76 is formed that penetrates along the Y axis, and along the through groove 76, the top plate portion 90 of the heat sink 9 is inserted. The top plate portion 90 of the heat sink 9 is arranged in a manner of contacting the upper surface of the core 2 between the inner surface of the core cover portion 75 and the upper surface of the core 2 along the through groove 76.

[0098] The heat generated on the upper surface of the core 2 is transferred to the top plate 90 of the heat sink 9, and then transferred from the top plate 90 to the side plate 91 of the heat sink 9. The heat transferred to the side plate 91 is transferred to the heat sink filled with the heat sink 9. Figure 1 The heat dissipating resin 82 in the housing 8 is shown, and further transferred from the heat dissipating resin 82 to the housing 8 , and is cooled by a cooling mechanism in contact with a bottom plate 80 of the housing 8 .

[0099] like Figure 7 As shown, the terminal block 7A has a terminal mounting portion 72 with four or more terminal grooves 71 arranged at predetermined intervals along the Y axis. The terminal block 7A has a pair of flat pieces 73 extending downward along the Z axis from both ends of the terminal mounting portion 72 along the Y axis, and a bent piece 74 integrally continuous between the pair of flat pieces 73, 73. The bent piece 74 of the terminal block 7A has an inner surface convex portion 74a that matches the shape of the central concave portion 77a1 of the vertical piece 77a provided at one end of the annular partition plate 77 along the X axis.

[0100] The vertical piece 77a of the partition plate 77 has the same Figure 6The inner surface convex portion 77a2 has a shape that matches the surface of the concave portion 22a1 formed at the end along the X-axis of the base portion 22a of the second core 22 shown. Figure 7 The flat plate 73 of the terminal block 7A shown has Figure 6 The inner surface of the side leg portion 22c of the second core 22 shown has a shape that matches the planar shape of the side end surface 22c2 along the X-axis.

[0101] Elastic pieces 74b are provided on both sides of the curved piece 74 formed continuously with the flat piece 73 along the Y axis. Notches are formed in a part of the curved piece 74 located on both sides of the elastic piece 74b, so that the elastic piece 74b can be elastically bent and deformed. The elastic piece 74b has a fitting hole, and a fitting protrusion 77b formed on the vertical piece 77a of the partition plate 77 can be fitted in the fitting hole, so that the curved piece 74 of the terminal block 7A and the vertical piece 77a of the partition plate 77 are positioned and fixed.

[0102] The flat plate 73 and the bent plate 74 having the same structure as the flat plate 73 and the bent plate 74 provided at the lower part of the terminal mounting part 72 of the terminal block 7A along the Z axis are also provided at the end of the core cover part 75 on the opposite side of the terminal mounting part 72 along the X axis. In addition, the vertical plate 77a having the above-mentioned engaging protrusion 77b is also provided at the other end along the X axis of the partition plate 77. These vertical plates 77a, 77a are engaged with the outer surfaces of a pair of bent plates 74, 74 formed on the terminal block 7A, and the terminal block 7A and the partition plate 77 are combined.

[0103] When the terminal block 7A and the partition plate 77 are combined, a gap is formed between the plate-like portion composed of the core cover portion 75 and the terminal mounting portion 72 and the partition plate 77, and a terminal block 78 is disposed in the gap. Figure 6 In addition, a gap extending along the Y axis is formed between the upper surface of the base portion 22a of the second core 22 and the through groove 76 of the core cover portion 75, and in this gap, Figure 5 The top plate portion 90 of the heat sink 9 shown is passed through, and the top plate portion 90 of the heat sink 9 can dissipate heat from the upper surface of the core 2 to the outside through the top plate portion 90 and the side plate portions 91 .

[0104] like Figure 6 As shown, the partition plate 77 is arranged in a manner of contacting the upper end of the coil body 30 along the Z axis, and the inner diameter of the through hole 77c formed in the partition plate 77 is substantially the same as the inner diameter of the second winding winding portion 50, or slightly larger, so that the middle leg portion 22b of the second core 22 can pass through. The partition plate 77 is preferably formed of an insulating member such as synthetic resin like the terminal block 7A, but is not necessarily formed of the same insulating member as the terminal block 7A.

[0105] In this embodiment, Figure 5The terminal mounting portion 72 of the terminal block 7A shown is fixed to the upper surface of one end of the second core 22 along the X-axis, and the end of the core cover portion 75 on the opposite side of the terminal mounting portion 72 along the X-axis is fixed to the upper surface of the other end of the second core 22 along the X-axis. As a technical means for fixing, for example, an adhesive is used. In this embodiment, the terminal block 7A can be directly fixed to the core 2 (specifically, the second core 22) without using a winding bobbin.

[0106] In the coil device 1A of the present embodiment, since the terminal block 7A has the core cover portion 75, the terminal block 7A is stably fixed to the upper surface of the core 2, and the fixing strength is also improved. In addition, since the core cover portion 75 has a through groove 76 for passing the heat sink 9, the heat dissipation of the core 2 is also ensured. Further, in the present embodiment, since the partition plate 77 can be formed by an insulating member, the insulation between the second core 22 and the coil body 30 is improved, and the insulation between the coil body 30 and each terminal 6 is also improved.

[0107] Furthermore, the terminal block 7A of the coil device 1A of the present embodiment is also provided with the mounting groove 71 having the insertion groove 71 a , so that the terminal 6 can be inserted and mounted in the mounting groove 71 along the X-axis similarly to the above-described embodiment.

[0108] In addition, in this embodiment, the partition plate 77 is combined with the terminal block 7A, but it is not necessary to combine them. In addition, the partition plate 77 can also be used in the coil device 1 of the first embodiment described above. The other structures and effects of this embodiment are the same as those of the first embodiment described above.

[0109] (Third embodiment) like Figure 8 and Fig. 9 As shown, the coil device 1B according to the present embodiment is different from the coil device 1 or 1A according to the above-mentioned embodiment only in the following structures and effects, and the description of the same structures and effects will be omitted. Figure 8 and Fig. 9 In, with Figure 1 to Figure 7 The same components as shown are denoted by the same reference numerals, and description of overlapping parts is omitted.

[0110] like Figure 8 As shown in FIG. 1 , the terminal block 7B of this embodiment has an intermediate core cover portion 75a. The intermediate core cover portion 75a is as shown in FIG. Fig. 9As shown in FIG. 1 , the terminal block 7B is formed between the terminal mounting portions 72, 72 provided at both ends of the terminal block 7B along the X axis, and is formed integrally with the terminal mounting portions 72, 72. The intermediate core cover portion 75a covers the central portion of the upper surface of the core 2B located between the two terminal mounting portions 72, 72. The terminal block 7B is formed of an insulating member such as synthetic resin, similarly to the terminal blocks 7, 7A of the above-mentioned embodiments.

[0111] The middle core cover portion 75a of the terminal block 7B is provided with at least one of a through hole extending from the inner surface of the middle core cover portion 75a to the outer surface and a concave-convex portion (reinforcement rib) formed on the outer surface. By forming the through hole and / or the concave-convex portion in the middle core cover portion 75a, it helps to prevent the terminal block 7B including the core cover portion 75a from warping, and helps to reduce the weight of the coil device 1B and improve the cooling efficiency.

[0112] The middle core cover portion 75a has a through groove 76 through which the top plate portion 90 of the heat sink 9 disposed in contact with the upper surface of the core 2B passes. By adopting such a structure, it is easy to make the heat sink 9 contact with the upper surface of the core 2B, and it is easy to dissipate the heat of the upper surface of the core 2B through the heat sink 9 to the heat dissipating resin or the external atmosphere.

[0113] like Fig. 9 As shown, the core 2B of this embodiment is made of the same material as the core 2 of the above-mentioned embodiment, and is a core with an E-shaped longitudinal section divided into two parts, which is the same, but the shape is slightly different. In this embodiment, the recessed portions formed on both sides of the base portion 22a of the second core 22B along the X-axis are a combination of a stepped recessed portion 22a2 and an intermediate recessed portion 22a3.

[0114] The middle recess 22a3 is formed in the central portion of the stepped recess 22a2 along the Y axis, and is further recessed inwardly than the stepped recess 22a2. The outer peripheral surface of the middle leg 22b is exposed at the bottom of the middle recess 22a3. The stepped recess 22a2 is a flat surface that is recessed inwardly more than the side end surface 22c2 of the side leg 22c along the X axis, and may be tapered and inclined relative to the side end surface 22c2 like the above-mentioned recess 22a1. In the present embodiment, it is recessed substantially parallel to the side end surface 22c2.

[0115] The stepped recess 22a2 and the intermediate recess 22a3 are formed on both sides of the base 22a of the second core 22B along the X axis. Similarly, the stepped recess 21a2 and the intermediate recess 21a3 are formed on both sides of the base 21a of the first core 21B along the X axis.

[0116] The terminal block 7B of this embodiment is as follows Fig. 9As shown, it includes a terminal mounting portion 72 having a pair of mounting grooves 71, 71 in which the terminals 6, 6 are respectively fitted with a pair of lead portions 41a, 41b connected to the first winding 4, and another terminal mounting portion 62 having a pair of mounting grooves 61 in which the terminals 6, 6 are respectively fitted with a pair of lead portions 51a, 51b connected to the second winding 5. The one terminal mounting portion 72 and the other terminal mounting portion 72 are respectively located at both ends of the terminal block 7B along the X axis.

[0117] A pair of mounting grooves 71, 71 formed in each terminal mounting portion 72 are formed corresponding to the stepped recesses 22a2 located on both sides of the middle recess 22a3 of the second core 22B. The surface of the stepped recess 22a2 of the second core 22B is covered by stepped curved pieces 74 provided at both ends of the terminal block 7B in the X-axis direction. Fig.11 As shown, the connection portion 61 of the terminal 6 is arranged outside the stepped bent piece 74 .

[0118] like Fig.13 As shown, at both ends of the terminal block 7B along the X-axis and at positions separated by a predetermined interval along the Y-axis, flat plates 73 extending downward from the terminal mounting portion 72 along the Z-axis are respectively formed. The stepped curved plate 74 is integrally formed in a manner recessed inwardly compared to the flat plate 73. In the present embodiment, a pair of cutouts parallel to the Z-axis are formed at a predetermined interval in each flat plate 73, and a bendable and elastically deformable mounting plate 73b is formed between these cutouts. The inner side of the mounting plate 73b can contact the side end surface 22c2 of the second core 22B through elastic force, so that the terminal block 7B is mounted to the upper surface of the core 2B.

[0119] The inner surface of the stepped curved piece 74 provided on the opposite side of the terminal block 7B along the X-axis has a shape consistent with the outer surface shape of the stepped recess 22a2 and the middle recess 22a3 of the second core 22B so as to fit with the stepped recess 22a2 and the middle recess 22a32. At the substantially central position along the Y-axis of each terminal mounting portion 72, a mounting protrusion 72d having an upper surface continuous with the upper surface of the mounting portion 72 is formed integrally with the mounting portion 72 in a manner protruding outwardly from the mounting portion 72 along the X-axis. The protruding front end position of the mounting protrusion 72d may be substantially flush with the outer surface of the flat plate 73 of the terminal block 7B, or protrudes outwardly along the X-axis compared thereto, or is introduced into a position.

[0120] A slit-shaped mounting groove 72e is formed on the upper surface of the mounting protrusion 72d, which is open toward the upper side of the Z axis and the outer side of the X axis. Fig.12As shown, in the mounting groove 72e, a mounting protrusion 70e formed on the inner surface of the first side piece 70d can be engaged, and the mounting protrusion 70e extends from the outer end along the X axis to the lower side along the Z axis at the approximately central part of the terminal cover 70B along the Y axis. By engaging the mounting protrusion 70e with the mounting groove 72e2, the terminal cover 70B can be easily positioned and mounted on the terminal mounting portion 72 of the terminal block 7B.

[0121] In each terminal cover 70B, the first side piece 70d has two cutouts on both sides along the Y axis, and the second side piece 70f is integrally provided with the terminal cover 70B. The second side piece 70f covers the connection part 61 of each terminal 6 from the outside along the X axis. The second side piece 70f also has the function of preventing the connection part 61 from being exposed to the outside and protecting it. Figure 8 As shown, the outer surface of the second side piece 70f may be substantially flush with the outer surface of the flat plate piece 73 of the terminal block 70B, or may protrude outward in the X-axis direction.

[0122] In the coil device 1B according to the present embodiment, even when the number of terminals 6 is large, the number of terminals 6 mounted on each terminal block mounting portion 72 can be reduced, for example, so that the position of the terminal 6 mounted on each terminal block mounting portion is easily aligned with the position of the stepped recess 22a2 formed in the second core 22B. Fig.13 As shown, in the present embodiment, most of the connection portion 61 of each terminal 6 is located inside the stepped recess 22a2 formed in the second core 22B.

[0123] In addition, most of the connection portion 61 of each terminal is as follows Fig.12 As shown in FIG. 1 , the terminal block 7B is located inside the stepped recess 74 between the flat plate 73 and the mounting protrusion 72d. As a result, as shown in FIG. Fig.13 As shown in FIG. 2 , the coil device is located inside the stepped recess 22a2. In the present embodiment, due to such a structure, the coil device can be further miniaturized. In addition, the heat dissipation is also improved.

[0124] In the above-mentioned embodiment, the terminal mounting portion 72 disposed at one end along the X-axis of the terminal block 7B and the terminal mounting portion 72 disposed at the other end may also be separately provided, but by integrally connecting them using the intermediate core cover portion 75a, it is easy to simultaneously position and mount the two terminal mounting portions 72, 72 on the upper surface of the core 2B. In addition, it also contributes to the miniaturization of the coil device 1B.

[0125] In the terminal block 7B of the coil device 1B of this embodiment, since the mounting groove 71 having the insertion groove 71a is provided, the terminal 6 can be inserted and installed in the mounting groove 71 along the X axis as in the above-mentioned embodiment. However, in this embodiment, unlike the above-mentioned embodiment, Fig.11 As shown, the terminal cover 70B has side pieces 70f, 70f covering the connection portion 61 of the terminal 7. The connection portions 61, 61 are covered by the side pieces 70f, 70f, so that the connection portions 61, 61 are protected, and the risk of collision with the connection portions 61, 61 during transportation of the coil device 1B is reduced, thereby improving the reliability of the connection portions 61, 61.

[0126] In addition, in this embodiment, unlike the above-mentioned embodiment, Fig.11 As shown, the terminal cover 70 has an injection hole 70g for injecting adhesive into the terminal base portion 60 of the terminal 6. By injecting adhesive into the terminal base portion 60 of the terminal 6 from the injection hole 70g, the terminal cover 70B is more reliably fixed to the terminal 6, and the terminal cover 70B is also more reliably fixed to the terminal block 7B.

[0127] Furthermore, in the present embodiment, a through hole 60b is formed in the terminal base portion 60 corresponding to the position of the injection hole 70g, so that Fig.14 The adhesive injected through the injection hole 70g shown reaches the mounting groove 71 of the terminal block 7B through the through hole 60b of the terminal base portion 60, so that the fixation of the terminal 6 relative to the terminal block 7B becomes more reliable, and the fixation of the terminal cover 70B to the terminal 6 and the terminal block 7B also becomes more reliable.

[0128] Furthermore, a recess 71c is formed at a position corresponding to the through hole 60b on the bottom surface of the mounting groove 71. The adhesive injected through the injection hole 70g reaches and accumulates in the recess 71c of the mounting groove 71 of the terminal block 7B through the through hole 60b of the terminal base portion 60, and the terminal 6 is fixed to the terminal block 70B more reliably, and the terminal cover 70B is fixed to the terminal 6 and the terminal block 7B more reliably.

[0129] In addition, in the present embodiment, the area of ​​the recess 71c (seen from above along the Z axis) is larger than the area of ​​the through hole 60b of the terminal 6, so the amount of adhesive accumulated in the recess 71c increases, the terminal 6 is more reliably fixed to the terminal block 7B, and the terminal cover 70B is more reliably fixed to the terminal 6 and the terminal block 7B. In addition, in the present embodiment, the injection hole 70g of the terminal cover 70B is formed with a countersunk hole 70h. The countersunk hole 70h has a larger opening area than the injection hole 70g, and the adhesive can also be accumulated in this part, so the fixation by the adhesive becomes more reliable. The other structures and effects of the present embodiment are the same as those of the first embodiment or the second embodiment described above.

[0130] (Fourth embodiment) like Fig.15 and Fig.16As shown, the coil device 1C involved in this embodiment is different from the coil device 1B of the above-mentioned embodiment only in the following structure and effects, and the description of the same structure and effects is omitted. Fig.15 and Fig.16 In, with Figure 1 to Figure 14 The same reference numerals are used to designate the same parts of the components shown in the figure, rather than designating all the same parts. Hereinafter, only the parts that are significantly different from the above-mentioned embodiment will be described, and the description of the duplicated parts will be omitted.

[0131] like Fig.15 and Fig.16 As shown, the terminal block 7C of this embodiment is Fig.10 and Fig.11 The terminal block 7C of the present embodiment is the same as the terminal block 7B except that the terminal block 7B does not have the intermediate core cover 75a. That is, the terminal block 7C of the present embodiment is composed of a pair of terminal blocks 7C separated along the X axis, each terminal block 7C having Figure 8 to Figure 14 The insertion groove 71a shown in the figure and the terminal mounting portion 72 provided with the mounting groove 71 having the stopper wall 71b and the recess 71c. In this embodiment, a pair of terminal blocks 7C are directly mounted on the upper surface of the core. The other structures and effects of this embodiment are the same as those of the first to third embodiments described above.

[0132] (Fifth embodiment) like Fig.17 and Fig.18 As shown, the coil device involved in this embodiment is different from the coil device 1, 1A or 1B of the above-mentioned embodiment only in the following structure and effect, and the description of the same structure and effect is omitted. Fig.17 and Fig.18 In, with Figures 1 to 13 The same components as shown are denoted by the same reference numerals, and description of overlapping parts is omitted.

[0133] The coil device according to the present embodiment uses a core 2 or 2B instead of the core 2 or 2B according to the above-mentioned embodiment. Fig.17 The core 2C or Fig.18 The core 2D shown in the figure is used instead of the heat sink 9 according to the above-mentioned embodiment. Fig.17 or Fig.18 The pair of heat dissipation plates 9a, 9a shown are otherwise the same as any one of the first to third embodiments described above or a combination thereof.

[0134] Fig.17 The core 2C shown is for example Fig. 9 A modification of the core 2B shown, Fig. 9The first core 21B and the second core 22B shown are each composed of a collection of core segments separated at the center position along the Y axis. Fig.17 The core 2C shown includes a pair of first core divided bodies 21B1 and a pair of second core divided bodies 22B1.

[0135] Each first core segment 21B1 includes a side leg portion 21c, a middle leg segment 21b2, and a base segment 21a4. The first core segment 21B1 is formed by abutting the abutting surfaces 21b3 formed on the respective segments 21B1 with each other to form a base segment 21a4. Fig. 9 The structure is the same as the first core 21B shown in FIG. Fig.17 When the first core segments 21B1 are combined with each other, as shown in FIG. Fig. 9 As shown, the middle foot portion 21b is formed in an elliptical column or a cylindrical shape, and a stepped recess 21a2 and an intermediate recess 21a3 are formed.

[0136] In addition, similarly, Fig.17 Each second core segment 22B1 shown in the figure has a side leg portion 22c, a middle leg segment 22b2 and a base segment 22a4, and the abutting surfaces 22b3 formed on each segment 22B1 are abutted against each other to form a base segment 22a4. Fig. 9 The structure of the second core 22B shown in FIG. Fig.17 When the second core segments 22B1 are combined with each other, as shown in FIG. Fig. 9 As shown, the middle foot portion 22b is formed in an elliptical column or a cylindrical shape, and a stepped recess 22a2 and an intermediate recess 22a3 are formed.

[0137] In addition, in this embodiment, instead of Fig. 9 The single heat sink 9 shown in FIG. Fig.17 As shown in the figure, a pair of heat sink split bodies 9a are used. Each heat sink split body 9a has a top plate portion 90a, a side plate portion 91a extending from the outer end of the top plate portion 90a along the Y axis to the lower side along the Z axis, and an insertion plate portion 92a extending from the inner end of the top plate portion 90a along the Y axis to the lower side along the Z axis.

[0138] Fig.17 The side plate portion 91a shown has Fig. 9 The side panel portion 91 shown has the same width and length. Fig.17 The top plate portion 90a shown has Fig. 9The top plate portion 90 shown has the dimensions of a structure separated in the center along the Y axis. In addition, the insertion plate portion 92a is inserted between the butt joint surfaces 22b3, 22b3 (21b3, 21b3) of the core segments 22B1, 22B1 (21B1, 21B1) and has a width of about half the width of the side plate portion 91a along the X axis. In addition, the insertion plate portions 92a formed in the pair of heat sinks 9a, 9a are arranged offset along the X axis so as not to overlap along the Y axis between the butt joint surfaces 22b3, 22b3 (21b3, 21b3).

[0139] The core segments 22B1 and 21B1 of this embodiment can be made of the same material as the cores 2 and 2B of the above-mentioned embodiment. Also, the heat sinks 9a and 9a are preferably made of a metal plate or the like having a better heat dissipation property than the core 2C, as in the above-mentioned heat sink 9.

[0140] In this embodiment, the core 2C is composed of four divided bodies 22B1, 21B1, and the divided bodies 22B1, 21B1 are combined in a state where the insertion plate portions 92a, 92a of the heat dissipation plate 9a are inserted between the butt surfaces 22b3, 22b3 (21b3, 21b3) of the divided bodies 22B1, 21B1. Therefore, the heat from the inside of the middle leg portion, which is most likely to accumulate heat, can be transferred to the top plate portion 90a and the side plate portion 91a through the insertion plate portion 92a, and the heat can be effectively dissipated to the outside.

[0141] In addition, in this embodiment, Fig. 9 The cores 21B and 22B of the embodiment shown are each divided into two parts, but it is also possible to Figure 2B or Figure 6 The cores 21, 22 are shown as being divided into two parts respectively.

[0142] further, Fig.18 The core 2D shown is for example Fig. 9 A further modification of the core 2B shown is to Fig. 9 The first core 21B and the second core 22B shown in the figure have different division positions and division numbers, and the core 2D is divided into a collection of core division bodies. That is, Fig.18 The core 2D shown includes a pair of first core divided bodies 21B2 , a pair of second core divided bodies 22B2 , and a pair of divided side plate portions 23 .

[0143] Each first core segment 21B2 includes a middle leg segment 21b2 and a base segment 21a4. The first core segment 21B2 is formed by abutting the abutting surfaces 21b3 formed on each segment 21B2 with each other to form a first core segment 21B2 without a middle leg segment 21b2. Fig. 9 The side leg portion 21c has the same structure as the first core 21B shown in FIG. Fig.18 When the first core segments 21B2 are combined with each other, as shown in FIG. Fig. 9 As shown, the middle foot portion 21b is formed in an elliptical column or a cylindrical shape, and a stepped recess 21a2 and an intermediate recess 21a3 are formed.

[0144] In addition, similarly, Fig.18 Each second core segment 22B2 shown in the figure has a middle leg segment 22b2 and a base segment 22a4, and the abutting surfaces 22b3 formed on each segment 22B2 are abutted against each other to form a Fig. 9 The structure of the second core 22B shown in FIG. Fig.18 When the second core segments 22B2 are combined with each other, as shown in FIG. Fig. 9 As shown, the middle foot portion 22b is formed in an elliptical column or a cylindrical shape, and a stepped recess 22a2 and an intermediate recess 22a3 are formed.

[0145] Fig.18 The split side plate portion 23 shown has a Fig. 9 The cores 21B and 22B shown in the figure have a structure in which the side plate portions 21c and 22c located at one end of the Y axis are continuous along the Z axis and separated from the base portions 21a and 22a. Fig.18 The end portion of the divided side plate portion 23 shown along the Z axis is fixed to the inner surface of each of the base divided bodies 21 a 4 and 22 a 4 close to the outer end along the Y axis, for example, by an adhesive or the like.

[0146] In addition, in this embodiment, Fig. 9 The single heat sink 9 shown in FIG. Fig.18 As shown in FIG. 1 , a pair of heat sink divided bodies 9a are used. Each heat sink divided body 9a has Fig.17 The heat dissipation divided body 9a shown in the figure has the same structure, so the detailed description thereof is omitted.

[0147] In this embodiment, the core 2D is composed of six divided bodies 22B2, 21B2, 23, and the divided bodies 22B2, 21B2, 23 are combined in a state where the insertion plate portions 92a, 92a of the heat dissipation plate 9a are inserted between the butt surfaces 22b3, 22b3 (21b3, 21b3) of the divided bodies 22B2, 21B2. Therefore, the heat from the inside of the middle leg portion, which is most likely to accumulate heat, can be transferred to the top plate portion 90a and the side plate portion 91a through the insertion plate portion 92a, and the heat can be effectively dissipated to the outside.

[0148] In addition, in this embodiment, Fig. 9 The core 2B6 of the embodiment shown is split, but it is also possible to Figure 2B or Figure 6 The core 2 shown is divided into six parts. The other structures and effects of this embodiment are the same as those of the first embodiment, the second embodiment, or the third embodiment described above.

[0149] In addition, the present invention is not limited to the above-mentioned embodiment, and various changes can be made within the scope of the present invention.

[0150] For example, in the above-described embodiment, the upper end of the first wire winding portion 40 or the lower end of the second wire winding portion 50 and the surface of the separator 10 may be bonded by a bonding method other than thermocompression bonding, such as using an adhesive.

[0151] In addition, in the above-mentioned embodiment, the first winding 4 constituting the first winding winding portion 40 and the second winding 5 constituting the second winding winding portion 50 are respectively constituted by different windings, but it is also possible to constitute a single winding in which the first winding 4 and the second winding 5 are continuous. In this case, the first winding winding portion 40 and the second winding winding portion 50 do not constitute a transformer in the circuit, but form a continuous single coil, which can be used as a part of a transformer or as a coil device other than a transformer. As a coil device other than a transformer, for example, an inductor, a resonant coil, a choke coil, a PFC coil, a reactor coil, etc. can be exemplified.

[0152] The spacer 10 is annular, but may be partially cut or divided in the circumferential direction. The spacer 10 is preferably formed as a single layer along the Z-axis (winding axis), but may be formed as a laminate of a plurality of spacers.

[0153] In addition, the spacer 10 may be in any shape or structure. For example, the spacer 10 may be a mesh itself, or radial or mesh grooves connecting the radial outer side and the radial inner side of the spacer 10 may be formed on one or both surfaces of the spacer 10 .

[0154] Furthermore, in the above-mentioned embodiment, the flow path forming area provided on the spacer 10 is composed of cutouts and through holes penetrating the front and back surfaces of the spacer, but the flow path forming area can also be a groove formed only on one side surface of the spacer 10, or a groove formed on both sides of the spacer.

[0155] Furthermore, in the above-described embodiment, the spacer 10 is disposed inside the coil body 30 , but the spacer 10 may not be provided in the coil device according to other embodiments.

[0156] Furthermore, in the coil devices 1, 1A, and 1B of the above-mentioned embodiments, the coil core assembly 3 is housed in the housing 8 filled with heat dissipating resin to improve heat dissipation, but the housing 8 and the heat dissipating resin 82 may not necessarily be provided depending on the situation. For example, a cooling fluid such as cooling air may directly contact the coil core assembly 3. Figure 2A The coil core assembly 3 is shown.

[0157] Furthermore, in the above-mentioned embodiment, the terminal blocks 7, 7A, 7B, 7C are directly mounted on the cores 2, 2B, 2C, 2D, but can also be mounted on the cores via a bobbin (not shown). In addition, the terminal blocks 7, 7A, 7B, 7C can also be mounted on the housing 8 instead of the core.

[0158] Furthermore, the coil device may be assembled by combining any of the above-described embodiments. Description of Reference Numerals

[0159] 1. 1A, 1B, 1C coil devices 2. 2B, 2C, 2D core 21, 21B core 1 21B1, 21B2 1st core segment 21a Base 21a2 Stepped concave portion 21a3 Middle concave part 21a4 base splitter 21b Midfoot 21b1 frontend 21b2 mid-leg split 21b3 docking surface 21c side foot 21c1 frontend 22, 22B second core 22B1, 22B2 second core split body 22a Base 22a1 concave part 22a2 Stepped recess 22a3 Middle concave portion 22a4 base splitter 22b Midfoot 22b1 frontend 22b2 mid-foot split 22b3 docking surface 22c side foot 22c1 frontend 22c2 side end surface 23 split side foot 3 coil core assembly 30 coil body 41st winding 40 1st winding section 41a, 41b lead portion 5. Second winding 50 2nd winding section 51a, 51b lead part 6 terminals 60-pin base 60a Insert tab 60b through hole 61 Connection section 62 External connection 7, 7A, 7B, 7C terminal blocks 70, 70B terminal cover 70a grip sheet 70b claw 70c through hole 70d 1st side panel 70e Mounting Tabs 70f 2nd side panel 70g injection hole 70h countersink 71 Mounting slot 71a Insertion slot 71b Stop wall 71c concave part 72 terminal mounting part 72a Inner surface 72b inner concave part 72c outer surface 72d installation convex part 72e installation slot 73 tablets 73a Inner surface 73b Mounting Plate 74 bending piece 74a Inner surface 74b elastic sheet 75 core cover 75a Middle core cover 76 through slot 77 Divider 77a vertical film 77a1 Central concave part 77a2 inner surface convex part 77b fitting convex part 77c through hole 8 Shell 80 base plate 81 side panel 82 Heat dissipation resin 9 heat sink 9a heat sink splitter 90, 90a top plate 91, 91a side panel 92a Insertion plate 10 Spacers

Claims

1. A coil device, wherein: have: a core comprising a magnetic body; a winding wire disposed in a coil about at least a portion of the core; and a terminal block for holding terminals to which the lead portions of the windings are connected, The terminal block has an installation groove into which the terminal to which the lead portion of the winding wire is connected can be inserted from a direction along a first axis substantially perpendicular to a winding axis of the winding wire.

2. The coil device according to claim 1, wherein: The terminal includes a connection portion to which a lead portion of the winding wire is connected, an external connection portion for connection to an external circuit, and a terminal base portion formed with an insertion protrusion to be inserted into an insertion groove of the mounting groove.

3. The coil device according to claim 2, wherein: The terminal board further includes a terminal cover mounted on the terminal block so as to cover at least the terminal base portion mounted on the mounting groove and expose the external connection portion.

4. The coil device according to claim 3, wherein: The terminal cover has a side piece that covers a connection portion of the terminal.

5. The coil device according to claim 3, wherein: The terminal cover has an injection hole for injecting an adhesive into the terminal base portion.

6. The coil device according to claim 5, wherein: The terminal base portion has a through hole formed therein corresponding to the position of the injection hole.

7. The coil device according to claim 6, wherein: A recessed portion is formed on the bottom surface of the mounting groove at a position corresponding to the through hole.

8. The coil device according to claim 7, wherein: The area of ​​the recess is larger than the area of ​​the through hole of the terminal.

9. The coil device according to claim 1, wherein: A recessed portion is formed on the bottom surface of the mounting groove at a position corresponding to the through hole of the terminal.

10. The coil device according to claim 1, wherein: The terminal block is arranged at a position covering at least a portion of the upper surface of the core.

11. The coil device according to claim 10, wherein: The terminal block is disposed at one end of the core along the first axis.

12. A coil device, wherein: have: a core comprising a magnetic body; a winding wire disposed in a coil about at least a portion of the core; and a terminal block for holding terminals to which the lead portions of the windings are connected, The terminal includes a connection portion to which the lead portion of the winding wire is connected, an external connection portion for connecting to an external circuit, and a terminal base portion mounted in the mounting groove of the terminal block. The terminal cover is mounted on the terminal block so as to cover at least the terminal base portion and expose the external connection portion.

13. The coil device according to any one of claims 1 to 12, wherein: and a housing for accommodating at least a portion of a winding portion of the winding wire. The housing is filled with a heat-dissipating resin to a position where at least a portion of the winding portion of the winding wire is immersed.

Images