JP2011187600A - Electromagnetic coil device and transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equalize the current distribution in each conductor even when alpha winding is made using a plurality of conductors for the purpose of use at high frequency. <P>SOLUTION: An electromagnetic coil device 1 has a first multilayer coil 3 formed by winding a multilayer straight angle wire 2 so that a direction in which a plurality of straight angle wires 21 to 24 are layered is inward in the diameter direction of the coil, a second multilayer coil 4 formed by winding the multilayer straight angle wire 2 so that a direction in which a plurality of straight angle wires 21 to 24 are layered is outward in the diameter direction of the coil, and a multilayer turning part 5 constructed by twisting the multilayer straight angle wire 2 so that the layering direction is inward in the diameter direction in one end 5A in which the first multilayer coil 3 is connected to the multilayer straight angle wire 2, the layering direction is outward in the diameter direction in other end 5B in which the second multilayer coil 4 is connected to the multilayer straight angle wire 2, and the layering direction is turned from inward to outward in the intermediate portion 5C between the one end 5A and the other end 5B. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic coil configured by winding a conductor and a transformer using the same.

  As an example of a conventional electromagnetic coil, a configuration described in Patent Document 1, for example, is known. In this conventional electromagnetic coil, a so-called alpha winding configuration is realized in which both the winding start portion and the winding end portion of the coil are on the outer periphery side of the coil, and the thickness direction dimension of the entire coil can be reduced.

JP 2009-206445 A (paragraphs 0042-0044, FIG. 3)

  By the way, the electromagnetic coil is used in a wide range of applications as an electrical component using a magnetic field, such as a transformer, a reactor, an electromagnet, and an air-core solenoid. In particular, when used at high frequencies, in consideration of the occurrence of the skin effect, a plurality of conductors having a thin wire diameter or a small thickness are bundled or laminated so as to have a necessary conductor cross-sectional area, and the plurality of conductors are spirally wound. An electromagnetic coil is formed by winding in a shape.

  However, when winding with a plurality of conductors bundled or stacked as described above, the following problems occur. In other words, in a plurality of wound conductors, the conductor located on the outer peripheral side has a longer overall length and a greater resistance value than the conductor located on the inner peripheral side, so that current concentrates on the conductor located on the inner peripheral side. And flow. As a result, the current distribution becomes non-uniform when viewed over the plurality of conductors.

  In the alpha winding electromagnetic coil according to the above-described prior art, no particular consideration is given to the structure in which a plurality of conductors as described above are bundled or stacked for use at high frequencies. Therefore, when an alpha winding is performed in a state where a plurality of conductors are bundled or stacked by this conventional technique, the current distribution is unsatisfactory due to the difference in the total length of each conductor from the winding start portion to the winding end portion. There was a risk of becoming uniform.

  An object of the present invention is to provide an electromagnetic coil capable of making the current distribution of each conductor uniform even when alpha winding is performed using a plurality of conductors for use at high frequencies, and a transformer using the same. It is in.

  In order to achieve the above object, in the present invention, a plurality of conductors each having a rectangular cross-sectional shape are sequentially laminated on one side in the thickness direction to form a laminated conductor, and the laminated conductor is formed a plurality of times in the circumferential direction. An electromagnetic coil configured by winding, wherein the multilayer conductor is wound with a predetermined diameter and a predetermined number of windings so that a stacking direction of the plurality of conductors is a radially inner direction of the coil. A first laminated portion, and a second laminated portion in which the laminated conductor is wound with the predetermined diameter and the predetermined number of turns so that the laminated direction of the plurality of conductors is a radially outer direction of the coil; In the one end portion connected to the laminated conductor of the first laminated portion, the laminated direction of the plurality of conductors is the radially inner direction, and in the other end portion connected to the laminated conductor of the second laminated portion. The lamination direction of the plurality of conductors is the diameter. The laminated conductors so that the laminating direction of the plurality of conductors turns from the radially inner direction to the radially outer direction at an intermediate portion between the one end and the other end. And a laminated turning portion formed by twisting and bending.

  In the present invention, a laminated conductor is constituted by laminating a plurality of conductors in the thickness direction, and the laminated conductor is wound to constitute an electromagnetic coil. Thereby, even if it is a case where it is used in the high frequency which a skin effect produces, a required conductor cross-sectional area is ensured and a required electric current can be flowed reliably. Moreover, by making the cross-sectional shape of each conductor a rectangular cross section, the space factor can be increased as compared with the case of using a conductor having a circular cross section.

  And in this invention, when winding the laminated conductor comprised as mentioned above, in the 1st lamination part, the lamination direction of each conductor in a lamination conductor turns into the direction which goes to the inner side from the diameter direction outside of a coil. After winding with a predetermined diameter and a predetermined number of turns, the laminated conductor is twisted together with the laminated conductor so that the direction of the laminated conductor turns about 180 ° on the cross section, and laminated at the second laminated section. The conductors are wound with the same predetermined diameter and the same predetermined number of turns so that the direction in which the conductors are stacked is the direction from the inside to the outside in the radial direction of the coil.

  By adopting such a winding mode, a so-called alpha in which the radially outermost circumference of the first laminated portion is a winding start portion of the laminated conductor and the radially outermost circumference of the second laminated portion is the winding end portion of the laminated conductor. When realizing the winding configuration, the lengths of the respective conductors from the winding start portion to the winding end portion are substantially the same, the resistance values are made equal to each other, and the current can be made to flow uniformly through the conductors.

  Preferably, the semiconductor device further includes an insulating member interposed between the first laminated portion and the second laminated portion, and the first laminated portion and the second laminated portion are configured such that the laminated conductors are substantially on the same plane. The first laminated portion includes a winding start portion of the laminated conductor on a radially outermost periphery, and the second laminated portion includes a winding end portion of the laminated conductor. It is provided on the outermost periphery in the radial direction.

  Thereby, it is possible to reliably realize a so-called alpha winding configuration in which the laminated conductor starts to be wound from the radially outermost periphery of the first laminated portion and the laminated conductor is wound at the radially outermost periphery of the second laminated portion.

  Preferably, the length of each conductor of the laminated conductor from the winding start portion to the winding end portion is substantially the same.

  Thereby, between the winding start part and the winding end part, the resistance values of all the conductors constituting the laminated conductor can be made equal to each other, and the current distribution in the electromagnetic coil can be made uniform uniformly.

  Preferably, the layer turning portion is provided on a radially inner side of the first layered portion or the second layered portion.

  By turning and bending the laminated conductors together in the laminated turning part provided on the radially inner side of the first laminated part or the second laminated part, the turning of the laminated conductor can be realized with certainty.

Preferably, when the thickness direction dimension of the multilayer conductor in the stack direction is h, the width direction dimension of the conductor constituting the multilayer conductor is w, and the thickness direction dimension of the insulating member is t ( h ² + w ² ) ^1/2 ≦ (2w + t).

  Thus, when the laminated conductor is twisted and bent in the laminated turning portion, the diagonal dimension of the rectangular cross section of the laminated conductor, which is the maximum dimension in the transverse section, is changed to the axial dimension of the coil (first laminated portion and second laminated portion). The direction dimension 2w of the portion and the direction dimension t of the insulating member). That is, since it can prevent that a lamination | stacking turning part protrudes from the axial direction dimension range of a coil, the unintentional enlargement of an electromagnetic coil can be prevented.

  In order to achieve the above object, the present invention provides a transformer having primary coil means and secondary coil means wound around a core, wherein at least one of the primary coil means and the secondary coil means is rectangular. A plurality of conductors having a cross-sectional shape of one or more layers are sequentially laminated on one side in the thickness direction to form a laminated conductor, and includes at least one electromagnetic coil configured by winding the laminated conductor a plurality of times in the circumferential direction; The electromagnetic coil includes a first laminated portion in which the laminated conductor is wound so that a laminated direction of the plurality of conductors is a radially inner direction of the coil, and the laminated direction of the plurality of conductors is a radial direction of the coil. The second laminated portion wound with the laminated conductor so as to be in the outer direction, and the one end portion connected to the laminated conductor of the first laminated portion has the laminated direction of the plurality of conductors in the radial inner direction. so The stacked direction of the plurality of conductors is the radially outer direction at the other end connected to the stacked conductor of the second stacked portion, and the intermediate portion between the one end and the other end. A laminated turning portion configured by twisting the laminated conductor so that the laminated direction of the plurality of conductors turns from the radially inner side to the radially outer side.

  Thereby, in the primary coil or secondary coil used for a transformer, it becomes possible to make an electric current flow uniformly to each conductor like the above.

  According to the present invention, even when alpha winding is performed using a plurality of conductors for use at high frequencies, the current distribution of each conductor can be made uniform.

It is a top view of the electromagnetic coil by one Embodiment of this invention. It is a cross-sectional view by the II-II cross section in FIG. It is a side view of the said transformer in the modification which applied the present invention to the primary side coil and secondary side coil of a transformer. It is a cross-sectional view of the primary side coil shown in FIG. It is a cross-sectional view of the secondary side coil shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of an electromagnetic coil in the present embodiment, and FIG. 2 is a cross-sectional view taken along the II-II section in FIG.

  1 and 2, the entire electromagnetic coil 1 is formed by bending a single laminated rectangular wire 2. The laminated rectangular wire 2 includes a plurality of (four in this example) rectangular wires 21, 22, 23, 24 each having a rectangular cross-sectional shape in the thickness direction of each of the rectangular wires 21, 22, 23, 24. It is formed by laminating along.

  The electromagnetic coil 1 includes a first laminated coil portion 3 and a second laminated coil portion 4 formed in the middle of the bent shape, and the first laminated coil portion 3 and the second laminated coil wire 2 along the bent laminated rectangular wire 2. A laminated turning part 5 located between the laminated coil parts 4 and an insulating paper 8 interposed between the first laminated coil part 3 and the second laminated coil part 4 in the coil axial direction to electrically insulate them from each other; have.

  As shown in FIGS. 1 and 2, the first laminated coil unit 3 and the second laminated coil unit 4 are overlapped in two stages in the axial direction of each other (the direction orthogonal to the paper surface in FIG. 1 and the horizontal direction in FIG. 2). Are arranged to be. In addition, since the 2nd laminated coil part 4 has overlapped with the back | inner side of the said 1st laminated coil part 3, it is not illustrated in FIG.

  The first laminated coil section 3 is a spiral in which a laminated rectangular wire 2 is wound with a predetermined diameter and a predetermined number of turns (4 times in this example) in the coil circumferential direction, and the whole is substantially rectangular on a substantially same plane. It is formed in a shape. At that time, the rectangular wires 21 to 24 in the laminated rectangular wire 2 are laminated in the order of the rectangular wire 21, the rectangular wire 22, the rectangular wire 23, and the rectangular wire 24 from the outside in the radial direction to the inside in the radial direction of the coil. (See FIG. 2).

  The second laminated coil part 4 is formed in a spiral shape in which the laminated rectangular wire 2 is wound four times in the coil circumferential direction with the same diameter as the first laminated coil part 3 and is substantially rectangular on the substantially same plane. It is a thing. At that time, the rectangular wires 21 to 24 in the laminated rectangular wire 2 are laminated in the order of the rectangular wire 21, the rectangular wire 22, the rectangular wire 23, and the rectangular wire 24 from the radially inner side to the radially outer side of the coil. (See FIG. 2).

  That is, the first and second laminated coil portions 3 and 4 are formed by winding the same laminated rectangular wire 2 with the same diameter and the same number of turns, and the overall shape and size of each of them. Are almost equal. Such first and second laminated coil portions 3 and 4 are arranged so that their coil central axes coincide with each other and are adjacent to each other in the axial direction, and as shown in FIG. Are arranged so as to overlap each other. In this state, for example, the laminated rectangular wire 2 on the outermost peripheral side of the first laminated coil portion 3 becomes the winding start portion 6 of the entire electromagnetic coil 1, and the laminated rectangular wire 2 on the outermost peripheral side of the second laminated coil portion 4 is It becomes the winding end portion 7 of the entire electromagnetic coil 1. Thus, the electromagnetic coil 1 has a so-called alpha winding mode in which the winding start portion 6 and the winding end portion 7 are both positioned on the outermost radial direction outer periphery of the entire coil.

  The laminated turning portion 5 is provided on the inner peripheral side of the first laminated coil portion 3 or the second laminated coil portion 4 and includes one end portion 5A, the other end portion 5B, and an intermediate portion 5C. That is, at the one end portion 5A connected to the first laminated coil portion 3, the rectangular wire 21, the rectangular wire 22, the rectangular wire 23, and the rectangular wire 24 are laminated in this order from the radially outer side to the radially inner side of the coil. ing. In the other end portion 5B connected to the second laminated coil portion 4, the rectangular wire 21, the rectangular wire 22, the rectangular wire 23, and the rectangular wire 24 are laminated in this order from the radially inner side to the radially outer side of the coil. Yes.

  And in the intermediate part 5C between the one end part 5A and the other end part 5B, the laminating direction in the order of the flat wire 21 → the flat wire 22 → the flat wire 23 → the flat wire 24 in the radial inner direction is the radial direction. Twisted to rotate 180 ° around the axis of the laminated rectangular wire 2 so that the laminated direction is in the order of the flat wire 21 → the flat wire 22 → the flat wire 23 → the flat wire 24 in the outward direction. Yes. In this manner, the innermost laminated rectangular wires 2 of the first laminated coil portion 3 and the second laminated coil portion 4 are connected to each other by the laminated turning portion 5 while turning in the middle.

Further, in relation to the twist bending structure of the laminated turning portion 5, the laminated rectangular wire 2 has a thickness direction dimension h in the lamination direction, a width direction dimension of the rectangular wires 21 to 24, and a thickness of the insulating paper 8. When the direction dimension is t,
(H ² + w ² ) ^1/2 ≦ (2w + t)
Each dimension is set so as to satisfy the condition (see a partially enlarged view in FIG. 2). That is, when the laminated rectangular wire 2 having a square cross-sectional shape of each side h and w is gradually turned in the laminated turning portion 5, the laminated rectangular wire 2 can occupy the coil axial dimension. The maximum dimension is the length (h ² + w ² ) ^1/2 of the diagonal line of the rectangle. Therefore, the above formula is for defining that the length (h ² + w ² ) ^{1/2 of the} diagonal line is equal to or smaller than the axial dimension (2w + t) of the entire electromagnetic coil 1.

  The rectangular wires 21, 22, 23, and 24 each constitute a conductor described in each claim, and the laminated rectangular wire 2 constitutes a laminated conductor. Moreover, the 1st laminated coil part 3 comprises a 1st laminated part, and the laminated coil part 4 comprises a 2nd laminated part. The insulating paper 8 constitutes an insulating member.

  In the electromagnetic coil 1 configured as described above, when a voltage is applied to both ends of the laminated rectangular wire 2 to cause a current to flow, the current flows separately to each of the rectangular wires 21, 22, 23, and 24. For example, when the end of the laminated flat wire 2 located on the left side in FIG. 1 is connected to the positive electrode as an input terminal, the first laminated coil portion 3 has an outer peripheral side of the coil while the current circulates in the clockwise direction. Flows from to the inner circumference. In this case, a current is input from the first laminated coil unit 3 to the innermost peripheral side of the second laminated coil unit 4 via the laminated turning unit 5, and the current is clockwise (that is, in the second laminated coil unit 4). It flows from the inner circumference side to the outer circumference side of the coil while circulating in the same circumferential direction as the first laminated coil portion 3. As described above, since current flows in the same coil circumferential direction in both the first laminated coil portion 3 and the second laminated coil portion 4, magnetic fluxes in the same direction are generated on the respective coil central axes, and the electromagnetic coil 1. It is possible to generate a unified magnetic field that combines these magnetic fluxes as a whole.

  In the electromagnetic coil 1 of the present embodiment configured as described above, the following effects can be obtained.

  That is, a plurality of (four in this example) rectangular wires 21, 22, 23, and 24 are laminated to form a laminated rectangular wire 2, and the laminated rectangular wire 2 is wound to constitute the electromagnetic coil 1. . Thereby, even if it is a case where it is used in the high frequency which a skin effect produces, a required conductor cross-sectional area is ensured and a required electric current can be flowed reliably. At this time, since the cross-sectional shape of each of the rectangular wires 21, 22, 23, and 24 is a rectangular cross section, the space factor of the conducting wire in the entire electromagnetic coil 1 can be increased as compared with the case where the conducting wire having a circular cross section is used.

  Further, in the first laminated coil portion 3, the laminated rectangular wire 22 is wound so that the rectangular wire 21 → the rectangular wire 22 → the rectangular wire 23 → the rectangular wire 24 from the radially outer side to the inner side of the coil. In the portion 5, the laminated rectangular wire 2 is twisted and bent so that the orientation of the laminated rectangular wire 2 turns approximately 180 ° on the cross section, and in the second laminated coil portion 4, the rectangular wire 21 → The laminated rectangular wire 22 is wound so that the rectangular wire 22 → the rectangular wire 23 → the rectangular wire 24. By adopting such a winding mode, the radially outermost periphery of the first laminated coil portion 3 is used as the winding start portion 6 of the laminated rectangular wire 2, and the radially outermost periphery of the second laminated coil portion 4 is the laminated rectangular wire 2. In the so-called alpha winding configuration in which the winding end portion 7 is formed, the lengths of the rectangular wires 21, 22, 23, 24 from the winding start portion 6 to the winding end portion 7 can be made substantially the same.

  That is, in the first and second laminated coil portions 3 and 4, the entire length of each of the rectangular wires 21, 22, 23, and 24 differs depending on the lamination order in the laminated rectangular wire 2, and the coil radial direction outside The flat wire located at the end of the coil is stretched when the coil is wound, and the overall length becomes longer than the flat wire located on the inner side in the coil radial direction. In the first laminated coil portion 3, the flat wire 21 located on the outermost side in the radial direction of the coil is the longest, and the flat wire 22, the flat wire 23, and the flat wire 24 are sequentially shortened in this order. In the second laminated coil portion 4, the flat wire 24 located on the outermost side in the radial direction of the coil is the longest, and the flat wire 23, the flat wire 22, and the flat wire 21 are sequentially shortened in this order.

  At this time, as described above, the first and second laminated coil portions 3 and 4 are formed by winding the laminated rectangular wire 2 so as to have the same diameter and the same number of windings. As a result, as described above, the order of the magnitude relation of the rectangular wires 21, 22, 23, 24 is opposite to each other in the first and second laminated coil parts 3, 4, but the rectangular wires 21, 22, 23, 24 are mutually reversed. The difference in length between the first and second laminated coil portions 3 and 4 is the same. As a result, when the electromagnetic coil 1 is viewed as a whole, the difference in length between the rectangular wires 21, 22, 23, 24 in the first and second laminated coil portions 3, 4 is offset, and as a result, all the rectangular Between the lines 21, 22, 23, and 24, the entire length from the winding start portion 6 to the winding end portion 7 is substantially equal. As a result, since the resistance values of the rectangular wires 21, 22, 23, 24 can be made equal to each other in the entire electromagnetic coil 1, the current flows in the rectangular wires 21, 22, 23, 24 of the laminated rectangular wire 2. Can be made to flow evenly.

  Further, even when a plurality of thin rectangular wires 21, 22, 23, 24 are used for use at high frequencies, the thin rectangular wires 21, 22, 23, 24 are collected in advance during the winding work. It is only necessary to twist the single laminated rectangular wire 2 at one place in the longitudinal direction to form the laminated turning portion 5. Therefore, the winding work when performing the alpha winding can be facilitated.

In this embodiment, in particular, the various dimensions of the laminated rectangular wire 2 are configured to satisfy (h ² + w ² ) ^1/2 ≦ (2w + t). Thereby, when the laminated rectangular wire 2 is twisted and bent in the laminated turning portion 5, the diagonal dimension (h ² + w ² ) ^1/2 of the rectangular transverse section of the laminated rectangular wire 2 becomes the maximum dimension in the transverse section. The axial dimension of the electromagnetic coil 1, that is, the sum of the directional dimension 2 w of the first laminated coil part 3 and the second laminated coil part 4 and the directional dimension t of the insulating paper 8 can be accommodated. As a result, the laminated turning portion 5 can be prevented from projecting from the axial dimension range of the coil, so that an inadvertent increase in the size of the electromagnetic coil 1 can be prevented.

  In addition, this invention is not restricted to the said embodiment, A various deformation | transformation is possible. That is, in the said embodiment, although the electromagnetic coil used alone was assumed like a reactor or an air core solenoid, this invention is not limited to this. For example, it is also possible to incorporate in a device including a plurality of electromagnetic coils such as a transformer.

  FIG. 3 is a side view of the transformer in a modification in which the present invention is applied to a primary coil and a secondary coil of the transformer. 4 is a cross-sectional view of the primary side coil of FIG. 3, and FIG. 5 is a cross-sectional view of the secondary side coil of FIG. 3 and 4 correspond to the cross-sectional view taken along the line AA in FIG. Moreover, in FIG. 3 to FIG. 5, the illustration for distinguishing the above-described rectangular wires is omitted in order to avoid the complexity of the illustration.

  3 to 5, in the transformer 100 of this modification, the primary side coils 31 and the secondary side coils 41 are alternately arranged in the same number. The primary coil 31 and the secondary coil 41 have the same overall outer shape. As a result, the primary coil 31 and the secondary coil 41 are all overlapped with their axial centers being coincident (overlapping in the vertical direction in FIG. 3), whereby the entire transformer 100 has a substantially cylindrical shape.

  Further, the winding start portions 36 of the primary side coils 31 are connected to each other by a common connection substrate 101, and the winding end portions 37 of the primary side coils 31 are connected to each other by a common connection substrate 103. Similarly, the winding start portions 46 of the secondary side coils 41 are connected by a common connection board 102, and the winding end portions 47 of the secondary side coils 41 are connected by a common connection board 104. . As a result, the primary coils 31 are connected in parallel to each other, and the secondary coils 41 are connected in parallel to each other.

  Moreover, all the primary side coils 31 and the secondary side coils 41 have the same front and back arrangement relationship. In other words, by matching the winding directions of the corresponding laminated coil parts (first laminated coil part 33 and first laminated coil part 43 described later, second laminated coil part 34 and second laminated coil part 44). The direction of current flow and the direction of magnetic flux are matched.

  Similar to the above embodiment, the primary coil 31 includes a first laminated coil portion 33 and a second laminated coil portion 34 (see FIG. 4) arranged in an overlapping manner in the coil axis direction, and the first and second laminated coil portions. And a laminating turning portion (not shown) disposed between 33 and 34. In each of the first and second laminated coil portions 33 and 34, the laminated rectangular wire 32 is wound four times, and the primary coil 31 as a whole has eight turns. The laminated rectangular wire 32 is formed by laminating a plurality of rectangular wires (not shown) along the thickness direction of each rectangular wire, as in the above embodiment. The hollow portion on the inner peripheral side is provided with a core 10 made of an appropriate magnetic material and having a thickness dimension equal to the axial thickness dimension of the entire primary coil 31.

  Similarly to the above-described embodiment, the secondary coil 41 also includes a first laminated coil portion 43 and a second laminated coil portion 44 (see FIG. 5) that are arranged so as to overlap in the coil axial direction, and the first and second laminated coils. And a layer turning part (not shown) disposed between the parts 43 and 44. Similarly to the above, the core 10 having a thickness dimension equal to the axial thickness dimension of the entire secondary coil 41 is provided in the hollow portion on the inner peripheral side.

  In each of the first and second laminated coil portions 43 and 44, the laminated rectangular wire 42 is wound eight times, and the secondary side coil 41 as a whole has 16 turns. That is, the secondary side coil 41 has twice the number of windings as the primary side coil 31. Similarly to the above, the laminated rectangular wire 42 is formed by laminating a plurality of rectangular wires (not shown) along the thickness direction of each rectangular wire. However, the laminated rectangular wire 42 of the secondary coil 41 is used as a rectangular wire having the same thickness as the rectangular wire 32 of the laminated rectangular wire 32 of the primary coil 31, and the number of laminated layers is halved (or the same number of laminated layers). Thus, as described above, the primary coil 31 and the secondary coil 41 have the same overall size (outer diameter and inner diameter). Both are the same).

  In addition, in the above, all the primary side coils 31 comprise the primary coil means of each claim, and all the secondary side coils 41 comprise the secondary coil means.

  In the transformer 100 having the above-described configuration, when an AC voltage Vi is input between the two connection boards 101 and 103 connected to all the primary side coils 31 and a current flows, the transformer 100 is arranged at the center of the axis of the transformer 100. An alternating magnetic flux is generated so as to penetrate the aggregate of substantially cylindrical cores 10. An electromotive force is generated in all the secondary coils 41 sharing the AC magnetic flux, and an AC voltage Vo is output between the two wiring boards 102 and 104 connected to the secondary coil 41.

  At this time, since the winding ratio of the primary side coil 31 and the secondary side coil 41 is 1: 2, the primary side coil 31 and the secondary side coil 41 are combined one by one. In the transformer 100, the ratio between the input voltage Vi and the output voltage Vo, that is, the transformation ratio of the transformer is 1: 2. As described above, since the number of turns of the secondary side coil 41 is twice that of the primary side coil 31, the resistance value of the secondary side coil 41 is four times that of the primary side coil 31. Is 1: 2, the value of the current flowing through the secondary coil 41 is ½ that of the primary coil 31. As a result, the copper losses of the primary side coil 31 and the secondary side coil 41 are equal to each other.

  Also in the transformer 100 of the present modification example, in the primary side coil 31 or the secondary side coil 41, it is possible to allow a current to flow uniformly through each rectangular wire as in the above embodiment. Further, even when a plurality of thin rectangular wires are used for high frequency, the alpha winding work can be facilitated.

  At this time, as described above, the transformation ratio can be set by providing a difference in the number of windings of the primary side coil 31 and the secondary side coil 41 provided on each of the primary side and the secondary side. Moreover, since the primary side coils 31 and the secondary side coils 41 are connected in parallel with each other, the electrical capacity (the amount of current that can be passed) of the added side can be increased by adding an electromagnetic coil module. There is also an effect that can be easily increased.

  Note that the primary side coils 31 or the secondary side coils 41 may be connected in series. In that case, by increasing the number of primary side coils 31 or secondary side coils 41 connected in series, the actual number of windings is increased. As a result, the primary coil 31 can generate a stronger magnetic flux, and the secondary coil 41 can increase the induced voltage. At this time, the transformation ratio can be set by increasing or decreasing the number of modules connected in series to the primary side and the secondary side. Moreover, you may connect in parallel combination and parallel connection suitably on the same side.

  Furthermore, since each one of the primary side coil 31 and the secondary side coil 41 can be handled as a module, there is an effect that the transformer 100 can be easily attached and detached.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

1 electromagnetic coil 2 laminated rectangular wire (laminated conductor)
3 1st laminated coil part (1st laminated part)
4 Second laminated coil part (second laminated part)
5 Laminate turning part 6 Winding start part 7 Winding end part 8 Insulating paper (insulating member)
10 Core 21, 22 Flat wire (conductor)
23, 24 Rectangular wire (conductor)
31 Primary coil (primary coil means)
32 laminated rectangular wire (laminated conductor)
33 1st laminated coil part (1st laminated part)
34 Second laminated coil part (second laminated part)
41 Secondary coil (secondary coil means)
43 1st laminated coil part (1st laminated part)
44 2nd laminated coil part (2nd laminated part)
100 transformer

Claims (6)

A plurality of conductors each having a rectangular cross-sectional shape are sequentially laminated on one side in the thickness direction to form a laminated conductor, and an electromagnetic coil configured by winding the laminated conductor a plurality of times in the circumferential direction,
A first laminated portion in which the laminated conductor is wound with a predetermined diameter and a predetermined number of windings so that a lamination direction of the plurality of conductors is a radially inner direction of the coil;
A second laminated portion in which the laminated conductor is wound at the predetermined diameter and the predetermined number of turns so that the laminated direction of the plurality of conductors is a radially outer direction of the coil;
In the one end portion connected to the laminated conductor of the first laminated portion, the laminated direction of the plurality of conductors is the radially inner direction, and in the other end portion connected to the laminated conductor of the second laminated portion. The stacking direction of the plurality of conductors is the radially outer direction, and the stacking direction of the plurality of conductors in the intermediate portion between the one end and the other end is the radially outer direction from the radially inner direction. A laminated turning part configured by twisting the laminated conductor so as to turn to
An electromagnetic coil comprising: The electromagnetic coil according to claim 1,
An insulating member interposed between the first stacked portion and the second stacked portion;
The first stacked unit and the second stacked unit are:
The laminated conductor is wound in a substantially spiral shape on substantially the same plane,
The first laminated portion is
The winding start portion of the laminated conductor is provided on the radially outermost periphery,
The second laminated portion is
An electromagnetic coil comprising a winding end portion of the laminated conductor on a radially outermost periphery. The electromagnetic coil according to claim 2,
The length of each conductor of the said laminated conductor from the said winding start part to the said winding end part is substantially the same, The electromagnetic coil characterized by the above-mentioned. The electromagnetic coil according to claim 2 or claim 3,
The laminated turning part is
An electromagnetic coil, wherein the electromagnetic coil is provided on a radially inner side of the first laminated portion or the second laminated portion. The electromagnetic coil according to any one of claims 2 to 4,
The thickness direction dimension of the laminated conductor in the lamination direction is h,
The width direction dimension of the conductor constituting the laminated conductor is w,
The thickness direction dimension of the insulating member is t,
When
(H ² + w ² ) ^1/2 ≦ (2w + t)
The electromagnetic coil characterized by being comprised. In a transformer having primary coil means and secondary coil means wound around a core,
At least one of the primary coil means and the secondary coil means forms a laminated conductor by sequentially laminating a plurality of conductors each having a rectangular cross-sectional shape on one side in the thickness direction, and the laminated conductor is arranged in the circumferential direction. Including at least one electromagnetic coil configured by winding a plurality of times,
The electromagnetic coil is
A first laminated portion in which the laminated conductor is wound such that the laminated direction of the plurality of conductors is a radially inner side direction of the coil;
A second laminated portion in which the laminated conductor is wound so that the laminated direction of the plurality of conductors is a radially outward direction of the coil;
In the one end portion connected to the laminated conductor of the first laminated portion, the laminated direction of the plurality of conductors is the radially inner direction, and in the other end portion connected to the laminated conductor of the second laminated portion. The stacking direction of the plurality of conductors is the radially outer direction, and the stacking direction of the plurality of conductors in the intermediate portion between the one end and the other end is the radially outer direction from the radially inner direction. A laminated turning part configured by twisting the laminated conductor so as to turn to
A transformer characterized by comprising:

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