JP2015225955A - coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil excellent in heat dissipation.SOLUTION: In a first coil 31 and a second coil 32, the bend 35e of a rectangular wire 35 in a layer adjoining in the lamination direction is deviated in the winding direction of the rectangular wire 35. Consequently, portions of the plane part 35a of the rectangular wire 35 are not overlap with each other but protrude in a layer adjoining in the lamination direction, by the deviation amount of the bend 35e of the rectangular wire 35 in the layer adjoining in the lamination direction. The extruding part of the plane part 35a of the rectangular wire 35 functions as a heat dissipation surface 35b to increase the heat dissipation area thus enhancing heat dissipation of the first coil 31 and second coil 32.

Description

  The present invention relates to a coil laminated in multiple layers by winding a rectangular wire spirally while being edgewise bent.

  For example, this type of coil is wound around a core to constitute an induction device such as a reactor or a transformer (see, for example, Patent Document 1).

JP 2012-15151 A

Incidentally, since the coil generates heat, it is desired to improve the heat dissipation of the coil.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a coil having excellent heat dissipation.

  A coil that solves the above-described problem is a coil that is laminated in multiple layers by spirally winding a rectangular wire while being edgewise bent, and the coil of the rectangular wire in adjacent layers in the lamination direction of the rectangular wire. The bent part is displaced in the winding direction of the rectangular wire.

  According to this, a part of the flat part of the flat wire does not overlap in the layer adjacent to the stacking direction by the amount that the bent part of the flat wire in the layer adjacent to the stacking direction is shifted in the winding direction. Yes. Since the protruding portion of the flat portion of the flat wire functions as a heat radiating surface and the heat radiating area is increased, the heat radiating property of the coil is improved.

About the said coil, it is preferable that the said bending part is formed in each layer of the said flat wire.
For example, the smaller the number of bent portions in each layer of the flat wire, the longer the distance from the center of winding of the flat wire to each bent portion, so that the size of the coil increases. On the other hand, as the number of bent portions in each layer of the flat wire increases, the process of winding the flat wire in a spiral shape while being edgewise bent becomes more complicated. A coil in which six bent portions are formed in each layer of the flat wire is a preferable configuration in order to avoid the two problems described above.

In the coil, it is preferable that bent portions of the rectangular wires in at least three layers adjacent to each other in the stacking direction are shifted from each other in the winding direction by a certain angle.
According to this, since the coil can be formed by a certain winding method, the coil can be manufactured easily.

About the said coil, it is preferable that the bending part of the said rectangular wire in the layer adjacent to the said lamination direction is arrange | positioned on the spiral with respect to the winding central axis of the said rectangular wire.
According to this, since the coil can be manufactured with the winding center axis fixed, the coil can be manufactured easily and the manufacturing time of the coil can be shortened.

  According to this invention, the coil excellent in heat dissipation can be provided.

The perspective view of the induction | guidance | derivation apparatus in embodiment. Sectional drawing of an induction | guidance | derivation apparatus. The partial plane sectional view of an induction device. The fragmentary sectional view of a guidance device. The perspective view of a 1st coil or a 2nd coil.

Hereinafter, an embodiment embodied in a coil constituting an in-vehicle induction device will be described with reference to FIGS.
First, the guidance device will be described.

  As shown in FIG. 1, the induction device 11 includes a first core 21 and a second core 22, and a first coil 31 and a second coil 32 as coils. The first core 21 and the second core 22 are U-shaped cores. The first core 21 and the second core 22 are magnetic bodies and are formed of a dust core.

  As shown in FIG. 2, the first core 21 includes a flat plate portion 21 a having a substantially rectangular flat plate shape, and a columnar first leg portion 21 b extending from one end in the longitudinal direction of the flat plate portion 21 a toward the second core 22. The cylindrical leg portion 21c extends from the other end in the longitudinal direction of the flat plate portion 21a toward the second core 22.

  The second core 22 includes a substantially rectangular flat plate portion 22a, a columnar first leg portion 22b extending from one end in the longitudinal direction of the flat plate portion 22a toward the first core 21, and a longitudinal direction of the flat plate portion 22a. And a columnar second leg portion 22c extending from the other end toward the first core 21.

  The first core 21 and the second core 22 have the same shape. In the first core 21 and the second core 22, the front end surfaces in the extending direction of the first leg portions 21b and 22b and the front end surfaces in the extending direction of the second leg portions 21c and 22c face each other. Are arranged as follows.

  Gap plates 13 are respectively interposed between the front end surfaces of the first leg portions 21b and 22b and the front end surfaces of the second leg portions 21c and 22c. Each gap plate 13 is a non-magnetic material (for example, ceramic), and is formed in a disk shape having the same outer diameter as each of the first leg portions 21b and 22b and each of the second leg portions 21c and 22c. Each gap plate 13 forms a gap between the front end surfaces of the first leg portions 21b and 22b and the front end surfaces of the second leg portions 21c and 22c.

  A first bobbin 41 is attached to the first core 21, and a second bobbin 42 is attached to the second core 22. The first bobbin 41 and the second bobbin 42 are made of resin. In the present embodiment, the first bobbin 41 and the second bobbin 42 are made of polyphenylene sulfide resin (PPS resin).

  The first bobbin 41 includes a flat plate portion 41a having a flat plate shape, a cylindrical first tubular portion 41b that protrudes from the flat plate portion 41a and into which the first leg portion 21b of the first core 21 is inserted, and a flat plate. A cylindrical second cylindrical portion 41c that protrudes from the portion 41a and into which the second leg portion 21c of the first core 21 is inserted is provided.

  The second bobbin 42 includes a flat plate portion 42a having a flat plate shape, a cylindrical first tubular portion 42b that protrudes from the flat plate portion 42a and into which the first leg portion 22b of the second core 22 is inserted, and a flat plate. It is formed from a cylindrical second cylindrical portion 42c that protrudes from the portion 42a and into which the second leg portion 22c of the second core 22 is inserted.

  The first bobbin 41 and the second bobbin 42 are arranged such that the leading ends in the protruding direction of the first cylindrical portions 41b and 42b and the leading ends in the protruding direction of the second cylindrical portions 41c and 42c face each other. Has been placed. The leading ends in the protruding direction of the first tubular portions 41b and 42b are in contact with each other. The tips in the protruding direction of the second cylindrical portions 41c and 42c are in contact with each other.

  The first coil 31 has a cylindrical shape and is wound around the first leg portions 21b and 22b via the first cylindrical portions 41b and 42b. The second coil 32 has a cylindrical shape and is wound around the second leg portions 21c and 22c via the second cylindrical portions 41c and 42c. In the present embodiment, the first coil 31 and the second coil 32 are laminated in multiple layers by winding a single rectangular wire 35 (conductive plate) spirally while being edgewise bent. And the front-end | tip parts of the 1st coil 31 and the 2nd coil 32 are connected in the connection part 33. FIG. The connecting portion 33 is formed by the first coil 31 wound around the first leg portions 21b and 22b and the second coil 32 wound around the second leg portions 21c and 22c adjacent to each other in the radial direction. It is provided in the gap. Further, the winding directions of the first coil 31 and the second coil 32 are different from each other. In addition, the structure which is not connected by the connection part 33, ie, the thing which formed the 1st coil 31 and the 2nd coil 32 integrally by edgewise bending one flat wire 35 may be sufficient.

  As shown in FIG. 3, the first coil 31 and the second coil 32 are each formed with six bent portions 35e of a flat wire 35 in each layer. That is, each layer in the first coil 31 and the second coil 32 is formed in a substantially hexagonal shape in plan view. And all the bending parts 35e of the flat wire 35 in the layer adjacent in the lamination direction of the flat wire 35 have shifted | deviated in the winding direction of the flat wire 35 in planar view. The bent portions 35e of the flat wire 35 in all the layers adjacent to each other in the stacking direction are shifted from each other in the winding direction of the flat wire 35 at a constant angle θ1.

  In each layer of the first coil 31 and the second coil 32, the bending angle θ2 of one of the six bending portions 35e is larger than the bending angle θ3 of the other bending portion 35e. By doing so, the first coil 31 and the second coil 32 of the present embodiment have the bent portion 35e of the flat wire 35 in the layer adjacent to the stacking direction in a state where the winding central axis C1 of the flat wire 35 is fixed. The winding is made in a certain way so as to be displaced in the winding direction of the flat wire 35 at a certain angle θ1. The degree of the change of the bending angle θ2 with respect to the “constant angle θ1”, that is, the bending angle θ3 is determined in advance by the number of layers of the rectangular wire 35 and the number of bending portions 35e.

  As shown in FIGS. 3 and 4, in the first coil 31 and the second coil 32, the bent portion 35 e of the flat wire 35 in the layer adjacent in the stacking direction is shifted in the winding direction of the flat wire 35. In the layers adjacent to each other in the stacking direction, a part of the flat portion 35a of the flat wire 35 protrudes without overlapping. Due to this protrusion, irregularities are formed in the layers adjacent to each other in the stacking direction in the cross section as shown in FIG. Specifically, since the bent portion 35e of the flat wire 35 in the layer adjacent in the stacking direction is displaced in the winding direction of the flat wire 35 at a constant angle θ1, the cross section of the first coil 31 and the second coil 32 is obtained. , The layers adjacent to each other in the stacking direction are shifted from each other in the width direction of the first coil 31 and the second coil 32. Thereby, irregularities in the layers adjacent to each other in the stacking direction are formed.

  As shown in FIG. 5, in the first coil 31 and the second coil 32, the bent portion 35e of the flat wire 35 in the layer adjacent in the stacking direction is arranged on a spiral with respect to the winding center axis C1. Specifically, each bending part 35e is arrange | positioned on the virtual line L1 extended helically centering on the winding center axis | shaft C1. In other words, the imaginary line L1 that connects the bent portions 35e of the flat wire 35 in the layers adjacent to each other in the stacking direction is formed so as to draw a spiral around the winding center axis C1.

Next, the operation of this embodiment will be described.
In the first coil 31 and the second coil 32, the flat portion 35a of the flat wire 35 in the layer adjacent to the stacking direction is equivalent to the amount of the bending portion 35e of the flat wire 35 in the layer adjacent to the stacking direction being shifted in the winding direction. A part of spills out without overlapping. Since the protruding portion of the flat portion 35a of the flat wire 35 functions as the heat radiating surface 35b and the heat radiating area is increased, the heat radiating properties of the first coil 31 and the second coil 32 are improved.

In the above embodiment, the following effects can be obtained.
(1) In the first coil 31 and the second coil 32, the bent portion 35 e of the flat wire 35 in the layer adjacent to the stacking direction is shifted in the winding direction of the flat wire 35. According to this, a part of the flat portion 35a of the flat wire 35 overlaps with the layer adjacent in the stacking direction by the amount that the bent portion 35e of the flat wire 35 in the layer adjacent in the stacking direction is shifted in the winding direction. It sticks out. Since the protruding portion of the flat portion 35a of the flat wire 35 functions as the heat radiating surface 35b and the heat radiating area is increased, the heat radiating properties of the first coil 31 and the second coil 32 are improved.

  (2) Six bent portions 35 e are formed in each layer of the flat wire 35. For example, the smaller the number of the bent portions 35e in each layer of the flat wire 35, the longer the distance from the winding center of the flat wire 35 to each bent portion 35e. Therefore, the physique of the first coil 31 and the second coil 32 is large. Turn into. On the other hand, as the number of the bent portions 35e increases in each layer of the flat wire 35, the process of winding the flat wire 35 in a spiral shape while being edgewise bent becomes more complicated. The first coil 31 and the second coil 32 in which six bent portions 35e are formed in each layer of the flat wire 35 are suitable for avoiding the two problems described above.

  (3) In the first coil 31 and the second coil 32, the bent portions 35e of the flat wire 35 in all the layers adjacent to each other in the stacking direction are shifted from each other in the winding direction of the flat wire 35 at a constant angle θ1. According to this, since the 1st coil 31 and the 2nd coil 32 can be formed by a fixed way, manufacture of the 1st coil 31 and the 2nd coil 32 can be made easy.

  (4) The bent portion 35e of the flat wire 35 in the layer adjacent in the stacking direction is disposed on the spiral with respect to the winding center axis C1. According to this, since the winding center axis C1 can be fixed and the first coil 31 and the second coil 32 can be manufactured, the first coil 31 and the second coil 32 can be easily manufactured. In addition, the manufacturing time of the first coil 31 and the second coil 32 can be shortened.

  (5) In the first coil 31 and the second coil 32, the winding center axis C1 is fixed, and the bent portion 35e of the flat wire 35 in the adjacent layer is wound in the winding direction of the flat wire 35 at a constant angle θ1. It is formed in a certain way of rolling so as to be displaced. Therefore, the first coil 31 and the second coil are suppressed while suppressing the reduction in the cross-sectional areas of the first leg portions 21b and 22b and the second leg portions 21c and 22c around which the first coil 31 and the second coil 32 are wound. The heat dissipation of 32 can be improved.

  (6) According to this embodiment, since the 1st coil 31 and the 2nd coil 32 excellent in heat dissipation can be provided, as a result, the heat dissipation of induction device 11 can be improved.

In addition, you may change the said embodiment as follows.
In the embodiment, the number of the bent portions 35e in each layer of the flat wire 35 is not particularly limited. For example, five bent portions 35e may be formed in each layer of the flat wire 35. That is, each layer in the first coil 31 and the second coil 32 may be formed in a substantially pentagonal shape in plan view.

In the embodiment, the number of the bent portions 35e may be changed for each layer of the flat wire 35.
In the embodiment, it suffices that at least one of the bent portions 35 e of the flat wire 35 in the adjacent layer is shifted in the winding direction of the flat wire 35.

  In the embodiment, in the first coil 31 and the second coil 32, the bent portion 35e of the flat wire 35 in the layer adjacent to the stacking direction is shifted in the winding direction of the flat wire 35 at a constant angle θ1, Not limited to this, the angle θ <b> 1 may be different for each layer of the flat wire 35.

In the embodiment, the bent portions 35e of the flat wire 35 in at least three layers adjacent to each other in the stacking direction may be shifted from each other in the winding direction of the flat wire 35 at a constant angle θ1.
In the embodiment, the first core 21 and the second core 22 may not have the same shape.

In the embodiment, the induction device 11 may be one in which the first coil 31 and the second coil 32 are wound around one core.
In the embodiment, the guidance device 11 may have three or more cores.

In the embodiment, the induction device 11 may have three or more coils.
In embodiment, you may apply the induction | guidance | derivation apparatus 11 to other than a reactor (for example, transformer).

In the embodiment, the guide device 11 may be other than the vehicle-mounted device.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The coil is wound around a core constituting the induction device.

  31 ... 1st coil as a coil, 32 ... 2nd coil as a coil, 35 ... Flat wire, 35e ... Bending part.

Claims (4)

A coil in which a flat wire is wound in a spiral shape while being edgewise bent and is laminated in multiple layers,
The coil characterized in that bent portions of the rectangular wires in adjacent layers in the stacking direction of the rectangular wires are displaced in the winding direction of the rectangular wires.   The coil according to claim 1, wherein six bending portions are formed in each layer of the rectangular wire.   3. The coil according to claim 1, wherein bent portions of the rectangular wire in at least three layers adjacent to each other in the stacking direction are displaced from each other in the winding direction by a certain angle.   4. The bent portion of the rectangular wire in a layer adjacent to the stacking direction is arranged on a spiral with respect to the winding central axis of the rectangular wire. 5. The coil according to item.