JP6429917B2 - Coil parts - Google Patents

Description

  The present invention relates to a coil component unit including a core and a coil, and a coil component including the coil component unit.

  The coil component is used for various electric devices, and includes a core and a coil wound around the core. Examples of the coil component include a choke coil configured by winding one conductive wire around a ring core, and a transformer configured by winding two conductive wires around a ring core.

JP-A-7-94330

  In a coil component including a coil component body having a core and a coil wound around the core, the coil component body may be covered with an insulating tape from the outside to be insulated. In such a case, there is a problem that the heat of the internal core tends to be trapped and the temperature of the coil component is increased. Therefore, in order to cool the core, the coil component body, which has been insulated with an insulating tape or the like, is housed in a metal case, and a filler having a heat dissipation property is filled and solidified in the case to form a filling molded portion. A technique for forming and dissipating the heat of the core to the case through the filling molding portion has been adopted. However, this technique merely exhausts the heat of the core through a member on the outer periphery of the core that does not directly touch the core. That is, the coil component main body remains completely covered with an insulation processing portion formed of an insulating tape or the like, and there is a problem that the heat of the core cannot be exhausted sufficiently.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a coil component unit and a coil component that can efficiently exhaust the heat of the buried core to the outside. There is.

The coil component of the present invention includes a coil component unit and a heat-radiating case that accommodates the coil component unit, and the coil component unit includes a core and a coil wound around a part of the core. A coil component main body, an insulating covering that surrounds the coil component main body, and a core covering portion that has thermal conductivity and is interposed between the core and the coil to cover the core. covering portion, a cylindrical portion of the one end a bottom, and protrudes outwardly exposed from the insulating coating part, have a, a projection in contact directly or indirectly with said casing, said projection is of the cylindrical portion It is provided in the bottom, protrudes below, and contacts the bottom face of the case .
The coil component of the present invention includes a coil component unit and a heat-radiating case that accommodates the coil component unit, and the coil component unit is a coil wound around a core and a part of the core. A coil component main body, an insulating coating that surrounds the coil component main body, and a core coating that has thermal conductivity and is interposed between the core and the coil, and covers the core. The core covering portion is a first annular plate that contacts the lower surface of the core and covers the lower surface, a protrusion protruding outward and exposed from the insulating covering portion, and a protrusion that directly or indirectly contacts the case; The projection is provided on the first annular plate so as to protrude downward from the insulating coating portion, and contacts the bottom surface of the case.

The coil component of the present invention includes a coil component unit and a heat-radiating case that accommodates the coil component unit, and the coil component unit includes a core and a coil wound around a part of the core. A coil component main body, an insulating covering that surrounds the coil component main body, and a core covering portion that has thermal conductivity and is interposed between the core and the coil to cover the core. The covering portion includes a first covering portion that contacts the lower portion of the core and covers the lower portion, and a protrusion that protrudes outward and is exposed from the insulating covering portion and directly or indirectly contacts the case. And the said protrusion is provided in the said 1st coating | coated part so that it may protrude below from the said insulation coating | coated part, and contacts the bottom face of the said case, It is characterized by the above-mentioned.
In addition, the coil component of the present invention includes a coil component unit, a heat-radiating case that accommodates the coil component unit, and heat conductivity, and the coil component unit is pressed from above and fixed to the case. A coil part main body having a core and a coil wound around a part of the core, and an insulation covering part surrounding the coil part main body. And a core covering portion that has thermal conductivity and is interposed between the core and the coil and covers the core, and the core covering portion protrudes outward from the insulating covering portion. The protrusion is exposed and directly or indirectly in contact with the case, the core is cylindrical, the columnar portion is disposed in a region surrounded by the inner periphery of the core, and an upper end of the coil component unit In contact with the fixed portion provided towards, the lower end is in contact with the bottom surface of the case, characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the coil component unit and coil component which can exhaust | emit efficiently the heat | fever of the buried core outside can be obtained.

It is a disassembled perspective view of the coil component which concerns on 1st Embodiment. It is a figure which shows each part structure and assembly process of the coil components which concern on 1st Embodiment. (A) is a core covering step, (b) is a coil winding step, (c) is an insulation treatment step, and (d) is a case housing and fixing step. It is a cross-sectional perspective view of the coil component which concerns on 1st Embodiment. It is a disassembled perspective view of the coil component which concerns on 2nd Embodiment. It is a figure which shows each part structure and assembly process of the coil component which concerns on 2nd Embodiment. (A) is a core covering step, (b) is a coil winding step, (c) is an insulation treatment step, and (d) is a case housing and fixing step. It is a cross-sectional perspective view of the coil component which concerns on 2nd Embodiment. It is a disassembled perspective view of the coil components which concern on 3rd Embodiment. It is a figure which shows each part structure of the coil component which concerns on 3rd Embodiment, and an assembly process. (A) is a core covering step, (b) is a coil winding step, (c) is an insulation treatment step, and (d) is a case housing and fixing step. It is a cross-sectional perspective view of the coil component which concerns on 3rd Embodiment.

  Hereinafter, a coil component unit and a coil component according to an embodiment of the present invention will be described with reference to the drawings.

[1. First Embodiment]
[1-1. Constitution]
FIG. 1 is an exploded perspective view of a coil component according to the first embodiment. FIG. 2 is a diagram illustrating the configuration of each part of the coil component and the assembly process according to the first embodiment. Specifically, FIG. 2 (a) shows a core coating process, FIG. 2 (b) shows a coil winding process, FIG. 2 (c) shows an insulation treatment process, and FIG. 2 (d) shows a case housing and fixing process. The coil component unit 10 in FIG. 2C shows the bottom surface side, and the coil component unit 10 in FIG. 2D shows the upper side. FIG. 3 is a cross-sectional perspective view of the coil component according to the first embodiment.

  As shown in FIG. 1, the coil component according to the present embodiment includes a coil component unit 10 and a case 4 that houses the coil component unit 10.

  The coil component unit 10 includes a coil component main body 11 and an insulating coating portion 3 that encloses the coil component main body 11. The coil component body 11 includes a core 1, a core covering portion 2, and a coil 5.

  The core 1 is an annular or cylindrical magnetic body. As a magnetic body constituting the core 1, a ferrite core, a dust core, a laminated steel plate, a wound iron core, or the like can be used. Here, the core 1 is a cylindrical ferrite core.

  The core covering portion 2 is a member that covers the core 1 so as to come into contact with the core 1 including the upper portion of the core 1, and forms an exhaust heat path for exhausting heat of the core 1. The core coating part 2 has thermal conductivity. For example, it is preferable to have higher thermal conductivity than the core 1. The core covering portion 2 can be configured using a metal, a resin such as plastic, or a ceramic such as alumina or aluminum nitride. The thermal conductivity is preferably 10 W / m · K or more, and more preferably 100 W / m · K or more. The core covering portion 2 may be made of an insulating material such as ceramic. This is because the electrical characteristics or magnetic characteristics of the coil component are not adversely affected.

  In this embodiment, the core coating | coated part 2 is a cup shape which copied the external shape of the core 1, and has the cylindrical part 20 with a bottom end. As shown in FIG. 2A, when the core 1 is accommodated in the core covering portion 2 having such a shape, the side surface of the core 1, that is, the annular shape of the core 1 is formed by the cylindrical portion 20 on the side of the core covering portion 2. The top surface of the core 1 excluding the top surface is covered, and the bottom surface which is one end surface covers the bottom surface of the core 1. Note that a hole is provided in the center of the bottom surface of the core covering portion 2.

  Here, “upper” and “lower” refer to the positional relationship when the coil component unit 10 is accommodated in the case 4, and the position when the coil component or the coil component unit 10 is mounted on an actual machine. It does not indicate a relationship or direction. The upper part of the core 1 means the upper part of the core 1 far from the bottom surface of the case 4 when the coil component unit 10 is mounted on the actual machine or accommodated in the case 4, and the lower part of the core 1 is The lower part of the core 1 near the bottom surface of the case 4 when the coil component unit 10 is accommodated in the case 4 is said.

  The core covering portion 2 has a plurality of protrusions 21. Here, the protrusion 21 is substantially L-shaped, and one side of the L shape is provided to extend outward along the bottom surface of the core 1, and the other side is provided to extend upward along the side surface of the core 1. ing. The protrusion 21 protrudes downward or outward from the cylindrical portion of the core covering portion 2.

  The protrusions 21 are provided at four positions in the circumferentially equidistant position of the core 1, and define a region around which the coil 5 is wound. As shown in FIG. 2, the protrusion 21 tapers toward the inside of the core 1 at the bottom surface portion of the core 1. In addition, the protrusion 21 should just be provided in 1 or more places, and may be provided in at least 3 or more places from a viewpoint of stability at the time of arrange | positioning to the case 4 of the coil component unit 10. FIG.

  As shown in FIG. 2B, the coil 5 is wound around a part of the core 1 in a state where the core 1 is covered with the core covering portion 2. Therefore, the core covering portion 2 is interposed between the core 1 and the coil 5. The coil 5 covers most of the entire periphery of the core 1 via the core covering portion 2. The coil 5 is made of, for example, a copper wire coated with an insulating coating. The coil 5 is composed of one conductor when the coil component functions as a reactor, and is composed of two conductors when the coil component functions as a transformer.

  The insulation coating portion 3 is an insulator such as varnish or tape and covers the periphery of the coil component body 10. Therefore, the insulation coating portion 3 has a toroidal shape following the shapes of the core 1 and the coil 5. However, as shown in FIG. 2C, the protrusion 21 protrudes outward from the insulating coating portion 3. That is, the coil component unit 10 is entirely insulated by being covered with the insulating coating portion 3, but here, the protrusion 21 protrudes and is exposed from the insulating coating portion 3 at the bottom.

  The case 4 is a container that accommodates such a coil component unit 10, and is made of a light metal having high thermal conductivity, such as aluminum or aluminum alloy, and has heat dissipation. The case 4 includes a cylindrical portion 42 and a substantially rectangular base plate 43 that covers the end of the cylindrical portion 42 and projects outward.

  As shown in FIG. 2D, after the coil component unit 10 is accommodated in the case 4, the case 4 may be filled with a filler and solidified. The filler may be filled and solidified to the vicinity of the upper end of the core 1 in the region surrounded by the inner peripheral surface of the core 1. As the filler, a resin having high thermal conductivity is suitable for ensuring the heat dissipation performance of the coil component. For example, an epoxy resin can be used as the filler.

  The case 4 may be installed on the cooling member so that the bottom surface thereof is in contact with the case 4 and function as an end of a heat exhaust path serving as a heat outlet of the core 1, or the case 4 itself may transfer heat transferred from the core 1. It may dissipate heat and function as a heat sink.

  As shown in FIGS. 1 and 3, a metal columnar portion 41 is provided in a region surrounded by the inner periphery of the core 1, and a disk-shaped fixing portion 7 is provided above the coil component unit 10. Here, the columnar part 41 extends upward from the bottom surface as a part of the case 4, and the upper end is in contact with the fixing part 7. Therefore, the columnar part 41 extends to the height of the upper part of the core 1. The fixing portion 7 is made of a light metal having high heat conductivity such as aluminum or aluminum alloy, and the coil component unit 10 is pressed from above and fixed by a columnar portion 41 and an adhesive or the like. Fix to 4. Note that the filling and solidifying step of the filler and the step of providing the fixing portion 7 may be performed before and after.

  Next, the exhaust heat path of the coil component will be described. FIG. 3 is a cross-sectional view that includes two protrusions 21 that face each other. As shown in FIG. 3, the core covering portion 2 is in contact with and covers the side surface and the bottom surface of the core 1, and is physically in contact with the bottom surface of the case 4 at the portion of the protrusion 21. Thereby, the heat of the upper part of the core 1 which is entirely wrapped by the insulating cover 3 and is difficult to cool can be exhausted to the case 4 through the core cover 2. Moreover, the heat of the core 1 transmitted to the insulating coating part 3 through the core coating part 2 is also exhausted from the side wall of the case 4 through the columnar part 41 or the filling molding part 6 made of a filler.

  Thus, since the core covering portion 2 exhausts heat by physical contact including the upper portion of the core 1, the coil component according to the present embodiment can be used even in a vacuum such as outer space. For example, it can be used as a transformer used in an artificial satellite. Further, since the coil component unit 10 is fixed by the fixing portion 7, the impact resistance is improved, and the coil component unit 10 can be used even in a severe environment such as outer space.

[1-2. Action / Effect]
(1) A coil component unit 10 according to the present embodiment includes a core 1 and a coil component main body 11 having a coil 5 wound around a part of the core 1, an insulating coating 3 enclosing the coil component main body 11, and heat A core covering portion 2 that has conductivity and is interposed between the core 1 and the coil 5 so as to cover the core 1. The core covering portion 2 protrudes outward and is exposed from the insulating covering portion 3. A protrusion 21 was provided.

  Thereby, even if the core 1 is wrapped with other members such as the coil 5 and the insulation coating portion 3, the heat of the core 1 is transferred from the core coating portion 2 in contact with the core 1 through the protrusion 21 to the insulation coating portion 3. The heat can be exhausted to the outside. Therefore, the core 1 buried inside can be efficiently cooled.

  Further, although the core 1 is a ferrite core in the present embodiment, the effect of exhausting heat to the outside can be expected especially with respect to the core because of the property that the heat of the core such as a ferrite core is not easily exhausted.

(2) The coil component unit 10 and the heat radiating case 4 that accommodates the coil component unit 10 are provided, and the protrusion 21 is in direct or indirect contact with the case 4. Here, the core 1 is a cylindrical core, the core covering portion 2 has a cylindrical portion 20 with one end, and the protrusion 21 is provided on the bottom of the cylindrical portion 20 and protrudes downward. 4 was brought into contact with the bottom surface.

  Thereby, the heat of the internal core 1 can be exhausted to the case 4. Particularly, since the cylindrical portion 20 is covered so as to be in contact with the upper portion of the core 1, the exhaust heat path is formed from the upper portion of the cylindrical portion 20 to the lower portion and the protrusion 21, and the case 4 A portion far away from the bottom surface can be effectively exhausted. Therefore, compared with the conventional coil component which exhausts heat only from the lower part, the upper part of the core 1 can be efficiently cooled, and the temperature distribution of the core 1 can be made uniform.

(3) The coil component unit 10 is pressed from above, and a fixing portion 7 for fixing to the case 4 is provided. Thereby, impact resistance can be improved.

(4) It is provided with a metal columnar portion 41 arranged in a region surrounded by the inner periphery of the core 1, and the columnar portion 41 has an upper end in contact with the fixed portion 7 provided above the coil component unit, and a lower end Was in contact with the bottom surface of the case 4. Thereby, since the plate-like portion 71 and the columnar portion 41 form a heat removal path different from the protrusion 21, the heat at the top of the core 1 can be efficiently discharged to the case 4.

(5) A plurality of protrusions 21 are provided in the circumferential direction of the core 1 so as to be separated from each other, define a winding region of the coil 5, and taper toward the inside of the core 1. Thereby, since the winding number of the coil 5 can be ensured, product characteristics can be ensured. That is, when the coil 5 is wound around the annular or cylindrical core 1, the product characteristics are improved as the number of turns of the coil 5 is increased. However, the inner side of the coil 5 is more conductive than the outside of the core 1. It is dense and has limited space. In the present embodiment, since the protrusion 21 is provided so as to taper inward toward the central axis of the core 1, the number of turns of the coil 5 can be ensured.

(6) The core covering portion 2 has an insulating property. Thereby, it can prevent that a loss arises under the influence of the magnetic field which generate | occur | produced with the coil 5, and can improve a product characteristic.

[2. Second Embodiment]
[2-1. Constitution]
A coil component according to the second embodiment will be described with reference to FIGS. The basic configuration of the second embodiment is the same as that of the first embodiment. Therefore, only a different point from 1st Embodiment is demonstrated, the same code | symbol is attached | subjected about the same part as 1st Embodiment, and detailed description is abbreviate | omitted.

  FIG. 4 is an exploded perspective view of the coil component according to the second embodiment. FIG. 5 is a diagram illustrating the configuration of each part of the coil component and the assembly process according to the second embodiment. FIG. 6 is a cross-sectional perspective view of the coil component according to the second embodiment.

  As shown in FIGS. 4 and 5 (a), the core covering portion 2 is composed of upper and lower covering bodies. That is, the core covering portion 2 includes a first annular plate 22 that covers the lower surface of the core 1 and a second annular plate 23 that covers the upper surface of the core 1. The first annular plate 22 is in contact with the lower surface of the core 1, and the second annular plate 23 is in contact with the upper surface of the core 1. The upper surface or the lower surface of the core 1 is an annular plate-shaped plane above or below the core 1.

  The projections 21 have a substantially triangular prism shape, and are provided at four circumferentially equidistant positions on the annular plates 22 and 23, respectively. The protrusion 21 provided on the first annular plate 22 protrudes downward, and the protrusion 21 provided on the second annular plate 23 protrudes upward. Therefore, at least the upper surface or the lower surface of the protrusions 21 of the annular plates 22 and 23 are exposed from the insulating coating portion 3. Both the upper protrusion 21 and the lower protrusion 21 are tapered toward the inside of the core 1, and the upper surface of the upper protrusion 21 and the bottom surface of the lower protrusion 21 exposed from the insulating coating portion 3 are substantially triangular. Make it.

  As shown in FIGS. 4 and 5D, the coil component unit 10 is provided with a disk 711, an annular plate 712, and an arm 72. The disk 711, the annular plate 712, and the arm 72 are made of a light metal with high thermal conductivity such as aluminum or aluminum alloy.

  The fixing part 7 of the second embodiment is a disk 711 that holds the inner peripheral part of the coil component unit 10 from above. An annular plate 712 that overlaps the periphery of the disk 711 is disposed on the disk 711. In other words, the annular plate 712 has an inner diameter smaller than that of the disk 711 and is substantially equal to the inner diameter of the core 1. Further, the outer diameter is substantially equal to the outer diameter of the core 1 and is arranged on the disk 711 so that the centers coincide with each other. The annular plate 712 is disposed above the protrusion 21 provided on the second annular plate 23 and is in contact with the protrusion 21.

  An arm 72 is provided on the annular plate 712. The arms 72 are long plate-like bodies, and four arms 72 are provided on the annular plate 712 at equal circumferential positions. The arm 72 extends downward from the annular plate 712 and grips the case 4 from the side. The arm 72 is in contact with the side surface of the case 4 at the surface.

  That is, a contact portion 45 that is in surface contact with the arm 72 is provided on the side portion of the case 4. The contact part 45 extends in the vertical direction, and the surface thereof is formed flat. Here, the case 4 is provided with a substantially rectangular base plate 43 projecting outward at the bottom of the cylindrical portion 42 that accommodates the coil component unit 10, and extends over the side portion of the cylindrical portion 42 and the base plate 43. A flush surface is formed. In the present embodiment, the base plate 43 is provided with a groove 44 into which the arm 72 is fitted in the vertical direction, and the surface forming the groove 44 becomes a part of the contact portion 45 with the arm 72 and the groove 44 is formed. The annular plate 712 and the arm 72 are positioned. The arm 72 may be fixed to the case 4 with screws or an adhesive.

  At this time, the plate-like portion 71 may be formed by the disk 711 and the annular plate 712, and the coil component unit 10 may be pressed from above by the plate-like portion 71 to fix the coil component unit 10 to the case 4.

  The exhaust heat path of the coil component according to the second embodiment will be described with reference to FIG. As shown in FIG. 6, the lower protrusion 21 provided on the first annular plate 22 is in contact with the bottom surface of the case 4, and the heat of the core 1 passes through the first annular plate 22 and the lower protrusion 21. The case 4 is exhausted. Further, the upper protrusion 21 provided on the second annular plate 23 is in contact with the lower surface of the annular plate 712. Therefore, the heat at the top of the core 1 can be exhausted to the case 4 via the second annular plate 23, the annular plate 712, and the arm 72. Further, since the annular plate 712 is connected to any of the arms 72, the heat of the core 1 via the upper protrusion 21 is rotated by the annular plate 712 and causes the other arm 72 different from the recently installed arm 72 to move. Heat can also be exhausted.

  Thus, even if the core 1 is entirely wrapped by the coil 5 and the insulating coating 3, the heat of the core 1 is transferred downward and upward using the core coating 2, the annular plate 712, and the arm 72 as a heat exhaust path. Heat can be exhausted.

[2-2. Action / Effect]
In the coil component according to the present embodiment, the core covering portion 2 has a first annular plate 22 that comes into contact with the lower surface of the core 1 and covers the lower surface, and the protrusions 21 are insulatively coated on the first annular plate 22. It is provided so as to protrude downward from the portion 3 and is in contact with the bottom surface of the case 4. Thereby, the heat of the inner core 1 can be exhausted to the outside.

  Furthermore, the core covering portion 2 has a second annular plate 23 that contacts the upper surface of the core 1 and covers the upper surface, and the protrusion 21 protrudes upward from the insulating covering portion 3 to the second annular plate 23. And an annular plate 712 that is disposed above the protrusion 21 and that contacts the upper protrusion 21, and an arm 72 that extends downward from the annular plate 712 and contacts the side portion of the case 4. did.

  Thereby, not only the projection 21 provided on the first annular plate 22 but also the projection 21 provided on the second annular plate 23 forms an exhaust heat path. That is, since the exhaust heat path is formed by the upper protrusion 21, the second annular plate 23, and the arm 72, the heat at the top of the core 1 can be exhausted. Therefore, the heat of the core 1 can be exhausted to the outside from both the upper part and the lower part of the core 1, and the entire core 1 can be efficiently cooled. For example, when the coil part of the comparative example in which the core covering portion 2, the annular plate 712 and the arm 72 are not provided is installed on a base plate having a constant 75 ° C., the maximum temperature of the coil part is about 158 ° C., and the temperature difference from the base plate is In contrast to the temperature of about 83 ° C., in the example in which the core coating portion 2 made of alumina was provided, the maximum temperature was about 109 ° C., and the temperature difference from the base plate remained at about 34 ° C. That is, the temperature difference can be reduced by 59% by providing the exhaust heat path with the core covering portion 2 made of alumina, the annular plate 712 made of aluminum, and the arm 72.

[3. Third Embodiment]
A coil component according to the third embodiment will be described with reference to FIGS. The basic configuration of the third embodiment is the same as that of the second embodiment. Therefore, only a different point from 2nd Embodiment is demonstrated, the same code | symbol is attached | subjected about the same part as 2nd Embodiment, and detailed description is abbreviate | omitted.

  FIG. 7 is an exploded perspective view of the coil component according to the third embodiment. FIG. 8 is a diagram illustrating the configuration of each part of the coil component and the assembly process according to the third embodiment. FIG. 9 is a cross-sectional perspective view of a coil component according to the third embodiment.

  As shown in FIGS. 7 and 8, the core covering portion 2 of the third embodiment is composed of upper and lower covering bodies as in the second embodiment, but the configuration is different. That is, the core covering portion 2 is in contact with the lower portion of the core 1 to cover the lower portion of the core 1 and the second covering portion 25 is in contact with the upper portion of the core 1 and covers the upper portion of the core 1. And having.

  Specifically, the first covering portion 24 has an annular plate 241 in contact with the lower surface of the core 1 and a cylindrical portion 242 that covers the lower portion of the side surface of the core 1 with the outer edge of the annular plate 241 as one end. The second covering portion 25 has an annular plate 251 in contact with the upper surface of the core 1, and a cylindrical portion 252 that covers the upper portion of the side surface of the core 1 with the outer edge of the annular plate 251 as one end.

  The protrusion 21 is substantially L-shaped. The protrusion 21 has one side of the L-shape provided on the annular plates 241 and 251, and the other side provided on the side surfaces of the cylindrical portions 242 and 252. The sides provided on the annular plates 241 and 251 are in contact with the arm 72 or the bottom surface of the case 4. Similar to the second embodiment, the upper protrusion 21 and the lower protrusion 21 have the upper surface or the lower surface exposed from the insulating coating portion 3, and the sides of both protrusions 21 are also exposed from the insulating coating portion 3. Yes. Therefore, when the filler is filled in the gap of the case 4 in which the coil component unit 10 is accommodated, heat can also be exhausted from the side wall of the case 4 via the protrusions 21 and the filling molding part 6. Further, the heat of the core 1 may be radiated from the side surface of the protrusion 21, or the heat of the core 1 may be exhausted so that the side surface is in direct contact with the case 4.

  The arm 72 extends radially from the plate-like portion 71 and is refracted midway, and extends downward from the refracted portion. The arm 72 is in contact with the upper protrusion 21 at the base end portion extending in the horizontal direction from the annular plate 712.

  The exhaust heat path of the coil component will be described with reference to FIG. As shown in FIG. 9, the lower protrusion 21 provided on the first covering portion 24 is in contact with the bottom surface of the case 4, and the heat of the core 1 passes through the first covering portion 24 and the lower protrusion 21. The case 4 is exhausted.

  Further, the upper protrusion 21 provided on the second covering portion 25 is in contact with the lower surface of the annular plate 712. In addition, the arm 72 is in contact with the protrusion 21 at a portion extending from the annular plate 712 in the horizontal direction, and is in contact with the contact portion 45 of the case 4 at the bent portion. Therefore, the heat at the top of the core 1 can be exhausted to the case 4 via the second covering portion 25, the annular plate 712, and the arm 72. Since the arm 72 extends in the horizontal direction, the contact area becomes larger than that in the second embodiment, so that the heat on the upper portion of the core 1 can be exhausted more effectively.

  Thus, even if the core 1 is entirely wrapped by the coil 5 and the insulating coating 3, the heat of the core 1 is transferred downward and upward using the core coating 2, the annular plate 712, and the arm 72 as a heat exhaust path. Heat can be exhausted.

[4. Other Embodiments]
The present invention is not limited to the first to third embodiments, and includes other embodiments described below. Further, the present invention also includes a form in which the first to third embodiments and the following other embodiments are all or any combination thereof. Furthermore, various omissions, replacements, and modifications can be made to these embodiments without departing from the scope of the invention, and modifications thereof are also included in the present invention.

(1) In the first to third embodiments, the shape of the core 1 is a cylinder, but the shape of the core 1 is not limited. For example, the shape of the core 1 may be a columnar shape such as a cylinder. In this case, the core 1 can be accommodated vertically in the case 4, the core covering portion 2 including the upper end of the column can be provided, and the protrusion 21 can be provided at the upper end portion of the column.

(2) In the first to third embodiments, the coil component unit 10 is accommodated in the case 4. However, the installation target may be a cooling member, and a heat-radiating plate-like body or the like so that the protrusions 21 are in contact with each other. It may be installed in. In this case, the cooling member side of the coil component unit 10 is “lower”, and the one far from the cooling member is “upper”.

(3) In the first to third embodiments, the fixing portion 7 may be fixed to the upper surface of the coil component unit 10 with an adhesive, a tape, or the like. In addition, the annular plate 712 of the second and third embodiments may be fixed to the upper surface of the coil component unit 10 with an adhesive, a tape, or the like.

(4) In the third embodiment, the first covering portion 24 and the second covering portion 25 are divided into upper and lower portions and both are not joined, but they may be joined at the end of the cylindrical portion. good. Thereby, since the heat of the upper part of the core 1 is transmitted not only to the upper heat dissipation path but also to the lower side, the upper part of the core 1 can be cooled more efficiently.

(5) The upper and lower sides of the core covering portion 2 of the second and third embodiments may be made of different materials. For example, in the second embodiment, the first annular plate 22 may be made of alumina, and the second annular plate 23 may be made of an aluminum alloy.

DESCRIPTION OF SYMBOLS 1 Core 10 Coil component unit 11 Coil component main body 2 Core coating | coated part 20 Cylindrical part 21 Protrusion 22 1st cyclic | annular plate 23 2nd cyclic | annular plate 24 1st coating | coated part 25 2nd coating | coated part 3 Insulation coating | coated part 4 Case 41 Columnar portion 42 Cylindrical portion 43 Base plate 44 Groove 45 Contact portion 5 Coil 6 Filling and forming portion 7 Fixing portion 71 Plate-like portion 711 Disc 712 Annular plate 72 Arm

Claims (10)

A coil component unit;
A heat-radiating case that houses the coil component unit;
With
The coil component unit is
A coil component body having a core and a coil wound around a part of the core;
An insulating coating surrounding the coil component body;
A core covering portion having thermal conductivity and covering the core interposed between the core and the coil;
With
The core covering portion is
One end is a bottomed tube part,
A protrusion that protrudes outwardly, is exposed from the insulating coating , and directly or indirectly contacts the case ;
I have a,
The protrusion is provided at the bottom of the cylindrical portion and protrudes downward to contact the bottom surface of the case;
Coil unit products characterized by. The cylindrical portion covers an upper portion of the core;
The coil component according to claim 1 . A coil component unit;
A heat-radiating case that houses the coil component unit;
With
The coil component unit is
A coil component body having a core and a coil wound around a part of the core;
An insulating coating surrounding the coil component body;
A core covering portion having thermal conductivity and covering the core interposed between the core and the coil;
With
The core covering portion is
A first annular plate in contact with the lower surface of the core and covering the lower surface ;
A protrusion that protrudes outwardly, is exposed from the insulating coating, and directly or indirectly contacts the case;
Have
The protrusion is provided on the first annular plate so as to protrude downward from the insulating coating, and contacts the bottom surface of the case;
Features and to Turkey yl components a. The core covering portion has a second annular plate that contacts the upper surface of the core and covers the upper surface;
The protrusion is provided on the second annular plate so as to protrude upward from the insulating coating portion,
An annular plate disposed above the protrusion and in contact with the protrusion;
An arm that extends downward from the annular plate and contacts a side of the case;
Is provided,
The coil component according to claim 3 . A coil component unit;
A heat-radiating case that houses the coil component unit;
With
The coil component unit is
A coil component body having a core and a coil wound around a part of the core;
An insulating coating surrounding the coil component body;
A core covering portion having thermal conductivity and covering the core interposed between the core and the coil;
With
The core covering portion is
A first covering portion that contacts the lower portion of the core and covers the lower portion ;
A protrusion that protrudes outwardly, is exposed from the insulating coating, and directly or indirectly contacts the case;
Have
The protrusion, the first cover part, wherein the provided insulating coating portion so as to protrude downward, it contacts the bottom surface of the case,
Features and to Turkey yl components a. The core covering portion has a second covering portion that contacts the upper portion of the core and covers the upper portion,
The protrusion is provided on the second covering portion so as to protrude upward from the insulating covering portion,
An annular plate disposed above the protrusion and in contact with the protrusion;
An arm that extends radially from the annular plate and bends in the middle, extends downward from the bent portion, and contacts the side of the case;
Is provided,
The coil component according to claim 5 . Having heat conductivity, pressing the coil component unit from above, and fixing to the case;
A columnar portion having thermal conductivity;
With
The core is cylindrical;
The columnar part is disposed in a region surrounded by the inner periphery of the core, the upper end is in contact with the fixing part provided above the coil component unit, and the lower end is in contact with the bottom surface of the case.
The coil component according to any one of claims 1 to 6 , wherein: A coil component unit;
A heat-radiating case that houses the coil component unit;
Having heat conductivity, pressing the coil component unit from above, and fixing to the case;
  A columnar portion having thermal conductivity;
With
The coil component unit is
A coil component body having a core and a coil wound around a part of the core;
An insulating coating surrounding the coil component body;
A core covering portion having thermal conductivity and covering the core interposed between the core and the coil;
With
The core cover part protrudes outwardly, is exposed from the insulating cover part, and has a protrusion that directly or indirectly contacts the case,
The core is cylindrical;
The columnar part is disposed in a region surrounded by the inner periphery of the core, the upper end is in contact with the fixing part provided above the coil component unit, and the lower end is in contact with the bottom surface of the case.
Coil parts characterized by A plurality of the protrusions are provided apart from each other in the circumferential direction of the core, define a winding region of the coil, and taper toward the inside of the core;
The coil component according to any one of claims 1 to 8 , wherein: The core covering portion has an insulating property;
The coil component according to any one of claims 1 to 9 .

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