JP2019004020A - Power transmission coil and manufacturing method thereof - Google Patents

Abstract

To provide a power transmission coil capable of ensuring proper coil performance and a manufacturing method thereof.SOLUTION: A power transmission coil 20 includes a coil winding portion 22 in which a conductor wire 21 is provided in a spiral shape around an axis X, a winding start end portion 23 which is an end portion on the winding start side of the conductor wire 21, and a winding finishing end portion 25 which is an end portion of the conductor wire 21 on the winding finishing side. In the power transmission coil 20, an axial thickness H1 of the coil winding portion 22 in the axial direction X is smaller than an outer diameter H2 of the winding start end portion 23 and an outer diameter H3 of the winding finishing end portion 25. Further, in the manufacturing method of the power transmission coil 20, the coil winding portion 22 is compressed from the axial direction along the axis by a first flat plate member and a second flat plate member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power transmission coil and a method for manufacturing the power transmission coil.

  Conventionally, there is a non-contact power transmission system that transmits power in a non-contact manner. In this non-contact power transmission system, for example, a power transmission coil on the power transmission side and a power transmission coil on the power reception side, which are each formed in a spiral shape, are installed facing each other, and power transmission on the power transmission side is performed by electromagnetic induction or magnetic resonance. Electric power is transmitted from the coil to the power transmission coil on the power receiving side (for example, Patent Document 1).

JP 2014-113021 A

  By the way, each conventional power transmission coil may be formed, for example, by winding a conductor wire such as a litz wire spirally around an axis. In this case, each of the conventional power transmission coils has a possibility that the coil performance varies due to a large tolerance of the inductance value due to the variation of the coil shape, and there is room for further improvement in this respect.

  Then, this invention is made | formed in view of the above, Comprising: It aims at providing the manufacturing method of the power transmission coil which can ensure appropriate coil performance, and a power transmission coil.

  In order to solve the above-described problems and achieve the object, a power transmission coil according to the present invention includes a coil winding portion in which a conductor wire is provided in a spiral shape around an axis, and an end on a winding start side of the conductor wire. A winding start end portion which is a winding end portion and a winding end end portion which is an end portion on the winding end side of the conductor wire, and an axial thickness along the axis line of the coil winding portion has the winding start end portion. It is characterized by being thinner than the outer diameter of the end and the outer diameter of the end of the winding.

  In the power transmission coil, the conductor wire is preferably a litz wire obtained by twisting a plurality of conductor strands.

  In the power transmission coil, the winding start end and the winding end end are preferably located outside or inside the coil winding portion when viewed from the axial direction.

  In the power transmission coil, the coil winding portion is preferably such that the conductor wire is covered with an adhesive member.

  In the method of manufacturing the power transmission coil according to the present invention, the conductor wire is tensioned on the rod-shaped member between the first flat plate member and the second flat plate member provided on the rod-shaped member so as to slidably face each other. A winding process in which a coil winding part is formed by spirally winding around an axis while the coil winding part is compressed by the first flat plate member and the second flat plate member from an axial direction along the axis. It is characterized by having.

  In the power transmission coil according to the present invention, the axial thickness along the axis of the coil winding portion is thinner than the outer diameter of the winding start end and the outer diameter of the winding end. Thereby, since the coil winding part is compressed along the axial direction in the power transmission coil, the thickness of the coil winding part in the axial direction can be made uniform. As a result, the power transmission coil can ensure proper coil performance. Moreover, since the manufacturing method of the power transmission coil according to the present invention compresses the coil winding portion from the axial direction along the axis by the first flat plate member and the second flat plate member, the thickness of the coil winding portion in the axial direction is reduced. It is possible to manufacture a power transmission coil that can be made uniform and ensure appropriate coil performance.

FIG. 1 is a perspective view illustrating a configuration example of a power transmission unit according to the embodiment. FIG. 2 is an exploded perspective view illustrating a configuration example of the power transmission unit according to the embodiment. FIG. 3 is a cross-sectional view taken along the line VV of FIG. FIG. 4 is a perspective view illustrating a configuration example of the power transmission unit in a state where the outer case according to the embodiment is removed. FIG. 5 is a cross-sectional view taken along line MM in FIG. 4 in the power transmission unit according to the embodiment. FIG. 6 is a cross-sectional view showing the power transmission unit on the power transmission side and the power reception side according to the embodiment. FIG. 7 is a perspective view showing an assembled jig for manufacturing the power transmission coil according to the embodiment. FIG. 8 is a flowchart illustrating a method for manufacturing the power transmission coil according to the embodiment.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the structures described below can be combined as appropriate. Various omissions, substitutions, or changes in the configuration can be made without departing from the scope of the present invention.

Embodiment
The power transmission unit 1 according to the embodiment will be described. The power transmission unit 1 is a unit that transmits power without contact and wirelessly communicates signals. The power transmission unit 1 functions as a power transmission side that transmits power or a power reception side that receives power. The power transmission unit 1 is used, for example, when charging a storage battery provided in a vehicle (not shown). In this case, the power transmission unit 1 on the power receiving side is installed, for example, on the bottom surface of the vehicle and connected to the storage battery of the vehicle. The power transmission unit 1 on the power transmission side is installed on the ground of a charging station (not shown) and connected to a power source, for example. The power transmission unit 1 on the power transmission side transmits the power supplied from the power source to the power transmission unit 1 on the power reception side by magnetic resonance or the like while facing the power transmission unit 1 on the power reception side. The power transmission unit 1 on the power receiving side receives the power transmitted from the power transmission unit 1 on the power transmission side, and outputs the received power to the storage battery of the vehicle. In the following description, the main configuration of the power transmission unit 1 is the same on the power transmission side and the power reception side. Therefore, the power transmission unit 1 will be described without distinguishing between the power transmission side and the power reception side unless otherwise specified.

  1 and 2, the power transmission unit 1 includes a substrate 10, a power transmission coil 20, a ferrite 30 as a magnetic member, a shield member 40, a communication coupler 50 as a communication unit, and an inner member. An inner case 60 and an outer case 70 as an outer member.

  Here, the axial direction is a direction along the axis X. The upper side in the axial direction is the power transmission coil 20 side, and the lower side in the axial direction is the substrate 10 side. The intersecting direction is a direction intersecting the axial direction. The orthogonal direction is a direction orthogonal to the axial direction.

  The substrate 10 is a so-called printed circuit board 10 on which various electronic components 11 such as a resonance capacitor are mounted and constitutes an electronic circuit that electrically connects the electronic components 11. The substrate 10 has a wiring pattern (print pattern) formed of a conductive member such as copper foil on an insulating layer made of an insulating material such as epoxy resin, glass epoxy resin, paper epoxy resin, or ceramic. The substrate 10 is electrically connected to the power transmission coil 20.

  The power transmission coil 20 is a coil that transmits power without contact. The power transmission coil 20 forms an LC resonance circuit together with a resonance capacitor. The power transmission coil 20 includes, for example, a coil winding portion 22 in which the conductor wire 21 is provided in a spiral shape around the axis X, a winding start end portion 23 that is an end portion on the winding start side of the conductor wire 21, and a winding start. An intermediate portion 24 that is a portion between the end portion 23 and the coil winding portion 22 and a winding end portion 25 that is an end portion on the winding end side of the conductor wire 21 are provided. The conductor wire 21 is, for example, a litz wire obtained by twisting a plurality of conductor wires. The coil winding portion 22 is a portion formed in a spiral shape by being wound a plurality of times from the inside toward the outside along the intersecting direction intersecting the axial direction. Typically, the coil winding portion 22 is wound a plurality of times from the inside toward the outside along the orthogonal direction orthogonal to the axial direction. The intermediate portion 24 is a portion where the conductor wire 21 crosses from the inside to the outside of the coil winding portion 22. The intermediate portion 24 is compressed along the axial direction and is fixed to the coil winding portion 22 by an adhesive member. The winding start end portion 23 and the winding end end portion 25 are located outside the coil winding portion 22 when viewed from the axial direction. The winding start end portion 23 and the winding end end portion 25 are connected to the substrate 10.

  As shown in FIG. 3, the coil winding portion 22 has the conductor wire 21 compressed along the axial direction, and the conductor wire 21 is covered and fixed by an adhesive member. As a result, the coil winding portion 22 is formed in a plate shape in which the cross-sectional shape of the conductor wire 21 is deformed and the space between the adjacent conductor wires 21 is closed. As a result, in the power transmission coil 20, the axial thickness H1 of the coil winding portion 22 is greater than the outer diameter H2 (for example, WW cross section) of the winding start end portion 23 and the outer diameter H3 of the winding end end portion 25. Is also formed thin. Thereby, the power transmission coil 20 can suppress variations in the coil shape, and can reduce the tolerance of the inductance value. Therefore, the power transmission coil 20 can suppress variations in coil performance and ensure appropriate coil performance. Since the power transmission coil 20 is formed by winding a single conductor wire 21, the outer diameter H2 of the winding start end portion 23 and the outer diameter H3 of the winding end end portion 25 have the same thickness. is there.

  The ferrite 30 is a member including a magnetic material, and is, for example, a composite oxide of iron oxide and metal. The ferrite 30 is formed in a rectangular plate shape, for example, and is formed in a size equivalent to that of the power transmission coil 20. The ferrite 30 is provided in the power transmission coil 20 so as to face along the axial direction. The ferrite 30 controls the loss of magnetic force through the magnetic force generated by the power transmission coil 20.

  The shield member 40 is a member that shields extra magnetic force (leakage magnetic field) of the power transmission coil 20 that causes noise and the like. The shield member 40 is made of a highly conductive metal such as copper or aluminum. The shield member 40 includes a shield wall portion 41 formed in an annular shape around the axis X, and both sides in the axial direction are open. The shield wall 41 is formed, for example, by winding a long plate member around the axis X one turn. The shield wall portion 41 is formed in a substantially rectangular shape when viewed from the axial direction, and the four corner portions are rounded. As shown in FIGS. 4, 5, etc., the shield wall 41 is provided so as to surround the power transmission coil 20 and the ferrite 30 at a position along the intersecting direction. That is, the shield wall portion 41 is provided on the outside so as to surround the power transmission coil 20 and the ferrite 30, and is provided so as to overlap the power transmission coil 20 and the ferrite 30 when viewed from the crossing direction.

  The shield wall portion 41 is formed in a shape that spreads toward the counterpart power transmission coil 20A side. That is, the shield wall portion 41 is formed such that the interval P between the wall surfaces 41a facing each other in the intersecting direction becomes wider from one side in the axial direction toward the other side (the counterpart power transmission coil 20A side) (see FIG. 5, see FIG. Thereby, the shield wall part 41 can suppress that the magnetic force line (magnetic flux line) of the power transmission coil 20 is orthogonal. Therefore, since the shield wall 41 can suppress the flow of eddy currents that generate a magnetic field that cancels the fluctuation of the magnetic field caused by the power transmission coil 20, it is possible to suppress a decrease in power transmission efficiency. Further, the shield wall 41 is formed in an arc shape in which a cross-sectional shape (cut portion 41 b) along the axial direction is curved to the outside of the shield wall 41. Thereby, the shield wall part 41 can suppress more that an eddy current flows.

  The communication coupler 50 is an antenna that transmits and receives signals. The communication coupler 50 is formed in an annular shape around the axis X. The communication coupler 50 is formed, for example, by winding the antenna wire 51 around the axis X a plurality of times (for example, three times) in a spiral shape. In the communication coupler 50, a first end portion 52 that is an end portion on the winding start side of the antenna line 51 and a second end portion 53 that is an end portion on the winding end side of the antenna line 51 are connected to the substrate 10. The communication coupler 50 is formed in a substantially rectangular shape when viewed from the axial direction. The communication coupler 50 is provided so as to surround the power transmission coil 20 at a position along the crossing direction. That is, the communication coupler 50 is located outside so as to surround the power transmission coil 20. The communication coupler 50 is provided with a shield member 40 between the power transmission coil 20 in the crossing direction. Thereby, the shield member 40 can suppress the magnetic force generated by the power transmission coil 20 from affecting the communication coupler 50. Therefore, the communication coupler 50 can suppress a change in characteristics and suppress a signal loss, so that it is possible to suppress a decrease in communication quality.

  The inner case 60 is a member accommodated in the outer case 70. The inner case 60 is formed of an insulating synthetic resin or the like and is formed by a well-known injection molding. The inner case 60 defines the relative positions of the substrate 10, the power transmission coil 20, and the ferrite 30 so that power can be transmitted to the counterpart power transmission coil 20 </ b> A, and can further communicate with the counterpart communication coupler 50 </ b> A. 40 and the relative position of the communication coupler 50 are defined. In the inner case 60, the substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 are assembled. Thereby, the power transmission unit 1 is in a state where the components including the substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 are positioned and assembled to the inner case 60. The inner case 60 can be accommodated in the outer case 70. Accordingly, the power transmission unit 1 can easily and accurately define the relative positions of the component parts and easily hold the component parts, as compared with, for example, the case where the component parts are directly assembled inside the outer case 70. be able to. Thereby, the power transmission unit 1 can also correctly define the relative position of the counterpart power transmission unit 1A with the components.

  The inner case 60 includes a support plate 61, a standing wall portion 62, and a storage chamber 63. The support plate 61 is provided so as to intersect the axis X. The standing wall portion 62 is erected from the support plate 61 and is annularly provided around the axis X. The standing wall 62 is formed in a substantially rectangular shape when viewed from the axial direction. The standing wall portion 62 has an outer shape that is the same as the inner shape of the communication coupler 50. The standing wall 62 is mounted with the communication coupler 50 by, for example, winding the communication coupler 50 around the outer surface. The standing wall portion 62 has an inner peripheral shape equivalent to the outer peripheral shape of the shield member 40. The standing wall portion 62 includes a curved support portion 62 a that supports the outer surface of the shield member 40 on the inner side. The standing wall portion 62 is mounted with the shield member 40 supported by the support portion 62a. For example, the standing wall portion 62 attaches the shield member 40 by attaching the shield member 40 to the support portion 62a with an adhesive tape or the like (not shown). The standing wall 62 is provided with a notch 61a at the upper edge in the axial direction. The notch 61a is formed by cutting a part of the upper edge of the standing wall 62 in the axial direction. Thereby, the notch part 61a can make a potting material and a molding material flow into the inner case 60 easily.

  The storage chamber 63 is formed in a rectangular parallelepiped shape and is provided inside the standing wall portion 62. The accommodation chamber 63 measures the temperature of the power transmission coil 20, the space 63 a for housing the power transmission coil 20, the insertion port 63 b for inserting the power transmission coil 20 into the space 63 a, and the outer case 70. And a mounting portion 63c for attaching a thermistor for detecting foreign matter (for example, metallic foreign matter) present in In the accommodation chamber 63, the power transmission coil 20 is inserted into the space 63a from the insertion port 63b, and the inserted power transmission coil 20 is accommodated in the space 63a. In the accommodation chamber 63, a thermistor for measuring the temperature of the power transmission coil 20 accommodated in the space 63a and detecting foreign matter existing between the outer cases 70 is attached to the attachment portion 63c. The inner case 60 is configured so that a part 60a on the insertion port 63b side can be separated from the main body 60b so that the power transmission coil 20 can be inserted into the space 63a from the insertion port 63b.

  The outer case 70 is a housing that covers the inner case 60. The outer case 70 is formed of an insulating synthetic resin or the like, and is formed by a well-known injection molding. The outer case 70 includes, for example, an upper case 71 provided on the upper side in the axial direction and a lower case 72 provided on the lower side in the axial direction. The outer case 70 is formed in a box shape by assembling the upper case 71 and the lower case 72 in the axial direction. The outer case 70 is provided with a connector opening 73 that exposes the connector connecting portion 11 a provided on the substrate 10. The outer case 70 is a state in which the substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 are assembled to the inner case 60, and the entire inner case 60 is covered by the upper case 71 and the lower case 72. cover.

  Next, a method for manufacturing the power transmission coil 20 will be described. The power transmission coil 20 is manufactured using the jig 100 shown in FIG. The jig 100 includes a first flat plate member 101 formed in a flat plate shape, a second flat plate member 102 formed in a flat plate shape, a rod-shaped member 103 formed in a bar shape, and a ring member (not shown). And an outer shape defining member 107.

  The first flat plate member 101 includes a hole (not shown) inserted through the rod-like member 103 and a first compression plane portion 101 b that compresses the coil winding portion 22.

  The second flat plate member 102 is formed to have a size equivalent to the outer shape of the coil winding portion 22, and a hole portion 102 a inserted through the rod-like member 103 and a second compression plane portion that compresses the coil winding portion 22. 102b.

  The rod-shaped member 103 is a member provided such that the first compression plane portion 101b of the first flat plate member 101 and the second compression plane portion 102b of the second flat plate member 102 are slidably opposed to each other.

  The ring member is a member that is provided between the first compression plane portion 101 b and the second compression plane portion 102 b and defines the inner diameter of the coil winding portion 22. In the ring member, the conductor wire 21 is wound around the outer periphery of the ring member in a spiral shape.

  The outer shape defining member 107 is a member that defines the outer shape of the coil winding portion 22. The outer shape defining member 107 includes a first outer shape defining portion 107 a that defines a half of the outer shape of the coil winding portion 22, and a second outer shape defining portion 107 b that defines the remaining half of the outer shape of the coil winding portion 22. The outer shape defining member 107 defines the entire outer circumference of the coil winding portion 22 by combining the first outer shape defining portion 107a and the second outer shape defining portion 107b.

  The power transmission coil 20 is manufactured using the jig 100 configured as described above. For example, as shown in FIG. 8, the method for manufacturing the power transmission coil 20 includes a winding step and a compression step, and further includes an adhesion step. In the winding process, first, the first flat plate member 101 and the second flat plate member 102 are provided so as to be slidably opposed to each other (step S1). For example, the hole 101a of the first flat plate member 101 is inserted into the rod-like member 103 from one side, and the ring member is inserted from the other side into the rod-like member 103 to be stacked on the first flat plate member 101. The hole 102 a of the second flat plate member 102 is inserted into the rod-shaped member 103 and laminated on the ring member 104. In the winding step, the conductor wire 21 is wound around the outer periphery of the ring member provided on the rod-shaped member 103 between the first flat plate member 101 and the second flat plate member 102 while being wound in a spiral shape, and the coil winding portion 22 is wound. Form. And the external shape of the coil winding part 22 is prescribed | regulated by attaching the external shape prescription | regulation member 107 with the volt | bolt 107c between the 1st flat plate member 101 and the 2nd flat plate member 102. FIG.

  Next, in the compression step, the coil winding portion 22 is compressed by the first flat plate member 101 and the second flat plate member 102 from the axial direction (step S2). For example, the first compression plane part 101b and the second compression plane part 102b are brought close to a distance of about the thickness of the ring member, and the coil winding part 22 is compressed in the axial direction.

  Next, in the bonding step, the conductor wire 21 of the coil winding portion 22 is bonded by an adhesive member (step S3). For example, in the bonding step, the coil winding portion 22 is heated to melt the adhesive member provided in advance on the conductor wire 21, and the coil winding portion 22 and the conductor wire 21 of the intermediate portion 24 are bonded by the adhesive member. Thereby, the power transmission coil 20 in which the inner diameter, the outer diameter, and the thickness H1 of the coil winding portion 22 are constant can be manufactured.

  As described above, in the power transmission coil 20 according to the embodiment, the axial thickness H1 of the coil winding portion 22 is thinner than the outer diameter H2 of the winding start end portion 23 and the outer diameter H3 of the winding end end portion 25. . Thereby, in the power transmission coil 20, since the coil winding portion 22 is compressed along the axial direction, the cross-sectional shape of the conductor wire 21 of the coil winding portion 22 is deformed from an annular shape to a rectangular shape, etc. The space between the lines 21 can be closed and formed into a plate shape. Therefore, the power transmission coil 20 can make the thickness H1 of the coil winding portion 22 in the axial direction uniform. Thereby, the power transmission coil 20 can suppress the variation of the coil shape and reduce the tolerance of the inductance value and the high frequency resistance value. Therefore, the power transmission coil 20 can ensure proper coil performance and suppress a decrease in power transmission efficiency. Further, the power transmission coil 20 can be reduced in outer shape. Further, when the power transmission coil 20 is disposed to face the power transmission side and the power reception side, the interval between the power transmission coil 20 on the power transmission side and the power transmission coil 20 on the power reception side can be accurately defined. Thereby, the power transmission coil 20 can suppress a decrease in power transmission efficiency.

  In the power transmission coil 20, the conductor wire 21 is a litz wire obtained by twisting a plurality of conductor strands. In the conventional power transmission coil, the shape of the coil winding portion 22 may vary depending on the wire diameter of the conductor wire of the litz wire and the twisting method. On the other hand, since the power transmission coil 20 of the embodiment can reduce the space in the litz wire and make the thickness H1 of the coil winding portion 22 uniform even if a litz wire is used as the conductor wire 21, the coil winding portion Variations in the shape of 22 can be suppressed.

  In the power transmission coil 20, the winding start end portion 23 and the winding end end portion 25 are located outside the coil winding portion 22 when viewed from the axial direction. As a result, the power transmission coil 20 has the winding start end portion 23 positioned inside the coil winding portion 22 and the winding end end portion 25 positioned outside the coil winding portion 22 as in the conventional power transmission coil. The coupling coefficient can be increased as compared with the case of doing so. For example, as a result of experiments, the conventional power transmission coil has a coupling coefficient of 0.339, but the power transmission coil 20 of the embodiment has a coupling coefficient of 0.562.

  In the power transmission coil 20, the coil winding portion 22 has a conductor wire 21 covered with an adhesive member. Thereby, the coil winding part 22 can maintain the shape of the coil winding part 22 compressed and formed relatively thin.

  Moreover, the manufacturing method of the electric power transmission coil 20 has a winding process and a compression process. In the winding process, the conductor wire 21 is tensioned around the axis X while applying tension to the rod-like member 103 between the first flat plate member 101 and the second flat plate member 102 provided on the rod-like member 103 so as to be slidably opposed. The coil winding part 22 is formed by winding in a spiral. In the compression step, the coil winding portion 22 is compressed by the first flat plate member 101 and the second flat plate member 102 from the axial direction. Thereby, the manufacturing method of the power transmission coil 20 can make the thickness H1 of the coil winding part 22 in the axial direction uniform, and can manufacture the power transmission coil 20 that ensures appropriate coil performance.

[Modification]
Next, a modification of the embodiment will be described. Although the example which melt | dissolves the adhesive member previously provided in the conductor wire 21 and fuse | melts the coil winding part 22 was demonstrated, it is not limited to this. For example, an adhesive member may be applied to the coil winding portion 22 formed in the winding process, and the conductor wire 21 of the coil winding portion 22 may be bonded by the applied adhesive member.
Moreover, although the winding start end part 23 and the winding end end part 25 of the power transmission coil 20 are described on the outside of the coil winding part 22 when viewed from the axial direction, the present invention is not limited thereto. For example, the winding start end portion 23 and the winding end end portion 25 may be positioned inside the coil winding portion 22 when viewed from the axial direction. As a result, the power transmission coil of the modified example has a winding start end portion 23 located inside the coil winding portion 22 and a winding end end portion 25 outside the coil winding portion 22 as in the conventional power transmission coil. The coupling coefficient can be increased as compared with the case where it is located at. For example, as a result of experiments, the conventional power transmission coil has a coupling coefficient of 0.361, but the modified power transmission coil has a coupling coefficient of 0.610.

  Moreover, although the example which forms the coil winding part 22 by a winding process and compresses the coil winding part 22 by a compression process after a winding process was demonstrated, it is not limited to this. For example, you may perform a winding process and a compression process simultaneously. For example, you may compress with the 1st flat plate member 101 and the 2nd flat plate member 102, winding the conductor wire 21. FIG.

  Moreover, although the board | substrate 10 demonstrated as what is a printed circuit board, it is not limited to this. For example, the substrate 10 may be an insert bus bar substrate or the like in which a conductive metal bus bar is built in an insulating resin material and various circuits are configured by the bus bar.

  Moreover, although the ferrite 30 demonstrated the example formed in the rectangular plate shape, it is not limited to this. For example, the ferrite 30 may be formed in a circular plate shape, or a plurality of small block-shaped ferrites may be arranged to form one ferrite.

  Moreover, although the shield member 40 demonstrated the example by which the both sides of an axial direction were opened, it is not limited to this. For example, the shield member 40 may be closed on the ferrite 30 side in the axial direction.

  Moreover, although the shield member 40 demonstrated the example in which the cross-sectional shape (cutting part 41b) along an axial direction was formed in the arc shape, it is not limited to this. For example, the shield wall portion 41 may have a rectangular cross-sectional shape along the axial direction.

  Moreover, although the outer case 70 demonstrated the example which is formed in a box shape and covers the inner case 60 completely, it is not limited to this. For example, the outer case 70 may be provided so as to cover the inner case 60 from the upper side in the axial direction in a state where the inner case 60 assembled with the component parts is installed on the installation surface.

  Moreover, although the inner case 60 demonstrated the example in which the board | substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 were assembled | attached with an adhesive tape etc., it is not limited to this. For example, the inner case 60 may be assembled with components including the substrate 10, the power transmission coil 20, the ferrite 30, the shield member 40, and the communication coupler 50 by insert molding. In this case, the inner case 60 can simplify the mold used in the insert molding as compared with the case where the component parts are directly assembled in the outer case (not shown) by insert molding. Thereby, the power transmission unit 1 can reduce manufacturing cost.

  In the inner case 60, the substrate 10 is assembled on the side opposite to the standing wall portion 62 of the support plate 61 via a plurality of spacers (not shown). Here, each spacer is a member that prevents interference between the inner case 60 and the electronic component 11 of the substrate 10. Each spacer is erected on the mounting surface 10 a of the substrate 10, and a bolt fastening hole (not shown) is provided at an end on the inner case 60 side. In the inner case 60, a plurality of bolt insertion holes (not shown) are provided in the support plate 61. In the inner case 60, each bolt insertion hole is aligned with the bolt fastening hole of each spacer. In the inner case 60, a plurality of bolts (not shown) are inserted into the respective bolt insertion holes, and the inserted bolts are fastened to the respective bolt fastening holes, whereby the substrate 10 is connected to the inner case 60. Assembled into. In the present embodiment, the inner case 60 is assembled with the support plate 61 of the inner case 60 and the substrate 10.

DESCRIPTION OF SYMBOLS 1 Power transmission unit 10 Board | substrate 20 Power transmission coil 21 Conductor wire 22 Coil winding part 23 Winding end part 25 Winding end part 101 1st flat plate member 102 2nd flat plate member H1 Thickness H2, H3 Outer diameter P Space | interval X Axis line

Claims (5)

A coil winding portion in which a conductor wire is provided in a spiral around the axis;
A winding start end that is an end on the winding start side of the conductor wire;
A winding end portion that is an end portion on the winding end side of the conductor wire, and
The power transmission coil, wherein a thickness of the coil winding portion in an axial direction along the axis is thinner than an outer diameter of the winding start end portion and an outer diameter of the winding end end portion.   The power transmission coil according to claim 1, wherein the conductor wire is a litz wire obtained by twisting a plurality of conductor strands.   3. The power transmission coil according to claim 1, wherein the winding start end portion and the winding end end portion are located outside or inside the coil winding portion when viewed in the axial direction.   The power transmission coil according to any one of claims 1 to 3, wherein the coil winding portion has the conductor wire covered with an adhesive member. A coil winding portion is formed by winding a coil wire around the axis while applying a tension to the rod-like member between the first and second flat plate members provided on the rod-like member so as to be slidably opposed. A winding step to be formed;
A compression step of compressing the coil winding portion from the axial direction along the axis by the first flat plate member and the second flat plate member;
The manufacturing method of the electric power transmission coil characterized by having.

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