JP2016186955A - High frequency coil and coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency coil, capable of improving high frequency characteristics by reducing a capacity of floating capacitance of a coil at a time of driving with a high frequency current, and capable of suppressing heat generation, and a coil device.SOLUTION: The high frequency coil includes a multiple column winding layer part 110, formed by arranging in an axial direction X a plurality of winding layer bodies 105, formed by continuously and spirally winding a wire W, and is driven with a high frequency current. Between the respective layers of the winding layer part, provided are first gaps K1 in a radial direction Y set at a gap dimension into which an insulating resin R can be permeated, which are gaps continuing in a circumferential shape or intermittent gaps. Between the respective winding layer bodies of the multiple column winding layer part, second gaps K2 are provided in the axial direction X set at a gap dimension to which the insulating resin can be permeated. The insulating resin is impregnated into the first and second gaps.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-frequency coil and a coil device driven by a high-frequency current, and more particularly to improvement of high-frequency characteristics and suppression of heat generation.

  2. Description of the Related Art Conventionally, a high-frequency coil device that is mounted on various inverters or the like and improves high-frequency characteristics, such as reducing switching noise associated with high-frequency current driving, is known. As shown in FIG. 10, in the conventional high-frequency coil device 200, for example, a pair of U-shaped magnetic bodies C and C are inserted into the hollow portions of a pair of coils 205 and 205 around which a single wire W is wound. In order to secure a predetermined inductance and direct current resistance value, series wiring and parallel wiring of the pair of coils 205 and 205 are performed (wiring is omitted). A gap G (not shown) for preventing magnetic saturation is provided between the pair of magnetic bodies C and C.

  FIG. 11 shows a conventional coil 205 wound in an aligned manner on a bobbin B. The numbers (1) to (36) in the figure indicate the winding order of the wire W. The lead wire Wa starts winding and is aligned and wound in the axial direction X from the innermost circumference (1) to (2), (3), and then rolled back from the end (12) to the upper part (13) in the layer direction Y. Below, it is wound according to the number. In order to prevent coil noise during driving, the wire W is usually impregnated with an insulating resin.

  In this case, the stray capacitance component Cs is formed between the opposing surfaces of the lower winding layer (1-12), the intermediate winding layer (13-24), and the upper winding layer (25-36). There is a case where high frequency characteristics are deteriorated due to a capacitance. As a countermeasure against this, it is known that the divided and stacked winding as shown in FIG. 12 can reduce the potential difference and the stray capacitance. However, the line factor of the winding is greatly impaired due to the interlayer defects of the divided bobbins. Therefore, it cannot be downsized.

  As an example of a coil for improving the line product (space factor) ratio of windings, unit coil portions formed by winding one winding in a spiral shape are repeatedly arranged in the winding axis direction (α winding) A coil device is known in which each unit coil portion is formed of a plurality of unit winding portions having different inner peripheral lengths, and a unit winding portion having a smaller inner peripheral length is pushed inside a unit winding portion having a larger inner peripheral length. (For example, Patent Document 1). In Patent Document 1, the line product (space factor) ratio of the winding is increased by the amount that the lead-in wire Wa is not wound from the innermost circumference as in the case of the conventional aligned laminated winding.

  In addition, a plurality of wound layers formed by partially overlapping one continuous wire deformed so as to circulate in a spiral shape are closely adhered in the thickness direction so that the wire in the curved portion It is also known that the wire is formed so that the curvature is gradually reduced from the inner peripheral side toward the outer peripheral side, and the wires are overlapped so as to be in close contact over the entire periphery (for example, Patent Document 2).

Japanese Patent Laid-Open No. 2003-86438 JP 2014-93846 A

  10 is compared with the coil of Patent Document 1 in the related art, the opposing area between the winding layers is smaller than the continuous winding layer (1-12) in the aligned laminated winding of FIG. Whereas the distance from the winding layer (13-24) is long, it is large, whereas the α winding of Patent Document 1 is formed by continuous unit coil portions and is small because the distance between the unit coil portions is short. Therefore, Patent Document 1 has a higher line product (space) ratio of the winding and a smaller stray capacitance Cs than the conventional aligned laminated winding.

  However, for high frequency applications, further reduction in the stray capacitance Cs is required. In Patent Document 2, the winding layers are in close contact with each other, and although the line product (space factor) ratio of the winding is high, the stray capacitance Cs is large, and it does not have sufficient performance as a high frequency coil.

  Moreover, in order to prevent coil noise and heat generation when the high-frequency coil device is driven with high-frequency current, when the insulating resin containing filler is filled in the winding, in the conventional laminated winding, the insulating resin filler is put in the winding. However, even in the above-mentioned Patent Documents 1 and 2, it is difficult to penetrate, and measures against heat generation due to high-frequency current are insufficient.

  An object of the present invention is to solve the above-described problems and improve high-frequency characteristics by reducing the stray capacitance of the coil when driving a high-frequency current, and a high-frequency coil and coil device capable of suppressing heat generation. I will provide a.

  In order to achieve the above object, a high-frequency coil according to one configuration of the present invention is a multi-row winding layer in which a plurality of winding layers formed by winding one wire continuously in a spiral shape are arranged in the axial direction. And is driven by a high-frequency current, and is a circumferentially continuous gap or an intermittent gap between the layers of the wound layer body, and has a gap dimension that allows the insulating resin to permeate. A set first gap in the radial direction is provided, and a second gap in the axial direction set in a gap dimension through which the insulating resin can penetrate is provided between the wound layers of the multi-row wound layer portion. The insulating resin is impregnated in the first and second gaps.

  According to this configuration, the first gap that is set to a gap dimension that allows the insulating resin to penetrate between the layers of the wound layer body, and the gap dimension that allows the insulating resin to penetrate between the wound layer bodies of the multi-row wound layer portion. Therefore, the high frequency characteristics can be improved by reducing the stray capacitance of the multi-row winding layer, and the insulating resin is provided in the first and second gaps. Since it is impregnated, heat generation in the multi-row winding layer portion can be suppressed.

  In the present invention, the insulating resin preferably contains a filler having high thermal conductivity. In this case, heat generation in the multi-row winding layer portion can be further suppressed by the filler in the insulating resin.

  In the present invention, when the circumferentially continuous gap is formed, the first gap may be formed including the back tension of the wire. Further, when forming a partial gap, the first gap may include the back tension of the wire, and may be formed by winding the wire after being bent intermittently. In this case, the first gap can be reliably formed.

  A high-frequency coil device according to another configuration of the present invention is the above-described high-frequency coil, wherein a magnetic material is inserted into a hollow portion of one or a pair of the multi-row winding layer portions. Therefore, it is possible to obtain a high frequency coil device capable of improving the high frequency characteristics by reducing the stray capacitance of the coil and suppressing heat generation.

  Preferably, a magnetic body is inserted into the hollow portions of the pair of multi-row winding layers, and the pair of multi-row winding layers is connected in series or in parallel. Preferably, the multi-row winding layer and the entire magnetic body are impregnated with an insulating resin.

  In the present invention, the first gap is set to have a void size that allows the insulating resin to penetrate between the layers of the wound layer body, and the void size allows the insulating resin to penetrate between the wound layer bodies of the multi-row wound layer portion. Therefore, the high frequency characteristics can be improved by reducing the stray capacitance of the multi-row winding layer, and the first and second gaps are impregnated with insulating resin. Therefore, heat generation can be suppressed.

It is sectional drawing which shows the high frequency coil apparatus which concerns on 1st Embodiment of this invention. It is a side view which shows the 1 volume layer body of the high frequency coil apparatus of FIG. It is a front view which shows the multi-row winding layer part of the high frequency coil apparatus of FIG. It is a schematic diagram which shows the multi-row winding layer part of the high frequency coil apparatus of FIG. It is a characteristic view which shows the operation | movement of the high frequency coil apparatus of FIG. It is a front view which shows the multi-row winding layer part which concerns on a modification. It is a front view which shows the multi-row winding layer part which concerns on a modification. It is a side view which shows the 1 volume layer body of the high frequency coil apparatus which concerns on 2nd Embodiment. It is a front view which shows the multi-row winding layer part of the high frequency coil apparatus of FIG. It is sectional drawing which shows the conventional high frequency coil apparatus. It is a schematic diagram which shows the conventional coil. It is a schematic diagram which shows the conventional coil.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a wound layer body (coil) of a high-frequency coil device according to a first embodiment of the present invention.
This high-frequency coil device 100 is driven by a high-frequency current, and the wound layer body 105 is formed by continuously winding one wire W around the bobbin B in a spiral shape, that is, in the radial direction Y A multi-row winding layer portion (high frequency coil) 110 is provided in which a plurality of winding layer bodies 105 are arranged in the axial direction X. The winding start of one wire rod W is the lead wire Wa, and the winding end is the lead wire Wb. The bobbin B has a hollow cylindrical shape made of an insulating material such as a synthetic resin, but may be omitted if necessary.

  In the multi-row wound layer portion 110, a first gap in the axial direction X that is a circumferentially continuous gap between the layers of the wound layer body 105 and has a gap dimension that allows the insulating resin R to permeate. K <b> 1 is provided, and a second gap K <b> 2 in the radial direction Y is set between the wound layers 105 of the multi-row wound layer portion 110 so as to have a void size that allows the insulating resin R to permeate therethrough. The first and second gaps K1 and K2 are impregnated with the insulating resin R. A magnetic body C having a plurality of gaps G for preventing magnetic saturation is inserted into the hollow portion of the multi-row winding layer section 110, and the entire magnetic body C is impregnated with an insulating resin. Note that the gap G may be omitted depending on the required performance of the coil device and the type of magnetic material. In this example, a pair of multi-row layers 110 are wound around both leg portions of the C-shaped magnetic body C (inner iron type). For example, a magnetic body such as an EI type or an EE type is used. Then, one multi-row winding layer portion may be wound around the middle leg portion of the magnetic body (outer iron type).

  As the wire W, an insulating wire having a round shape, a flat shape, or a square shape is preferably used. Examples of the insulating resin include an epoxy resin and a silicon resin in addition to the varnish, and examples of the filler include inorganic particles such as aluminum oxide and silicon oxide having a thermal conductivity higher than 1.0 W / mK.

  2 is a side view showing a one-layered layer body of the high-frequency coil device 100, FIG. 3 is a front view showing the multi-row winding layer portion 110, and FIG. 4 is a schematic view showing the multi-row winding layer portion 110. As shown in FIG. 2, first, the first winding layer body 105 on the lead wire Wa side at the start of winding has the outermost winding layer (1) from the outer peripheral side toward the inner peripheral side (2), (3 ) And the wire W in the innermost winding layer (3) is continuous with the wire W of the innermost winding layer (4) of the second adjacent winding layer body 105 ( As shown in FIG. 4, the second wound layer body 105 is wound in order from (5) and (6) toward the outer peripheral side from the inner peripheral side. Next, the wire W in the outermost winding layer (6) is continuously connected to the wire W of the outermost winding layer (7) of the third adjacent winding layer 105 (outside transfer (not shown)). (Layer wire) The third wound layer body 105 is wound sequentially from (8), (9) toward the inner periphery side from the outer periphery side. Thereafter, these windings are repeated.

  In this case, as shown in FIG. 2, in the first wound layer body 105, the wire diameter of the wire W and the gap dimension of the first gap K1 are determined from the radius indicating the inner circumferential circle a of the outermost wound layer (1). The inner circumference circle b of the wound layer (2) is formed by winding the inner circumference circle a based on the radius obtained by subtracting the inner circumference circle b, and the inner circumference circle b based on the radius obtained by subtracting the same wire diameter and the same gap dimension. The inner circumference circle c of the wound layer (3) is formed. Since the gap dimension of the first gap K1 is expanded in the radial direction due to the back tension of the wire W, it is set slightly smaller than the actual gap dimension in consideration of this. As a result, a second gap K1 through which the insulating resin R can permeate is formed in the first wound layer body 105. The first gap K1 is set to a minimum gap through which the insulating resin R penetrates.

  As shown in FIG. 3, a second gap K <b> 2 through which the insulating resin R can permeate is formed between the first wound layer body 105 and the second wound layer body 105. The second gap K2 is set to a minimum gap through which the insulating resin R penetrates. For example, when the wire diameter of the wire W is 2 mm, the first and second gaps K1 and K2 are preferably in the range of 10 μm to 100 μm.

  In the second wound layer body 105, the outermost layer of the innermost wound layer (4) is arranged on the outer side based on the radius obtained by adding the wire diameter of the wire W and the gap size of the first gap K 1 to the radius indicating the outer circumference circle. The outer circumference of the wound layer (5) is formed by winding, and further, the outer circumference of the wound layer (6) is formed by winding the outer circumference based on the radius obtained by adding the same wire diameter and the same gap dimension. Since the gap dimension of the first gap K1 is expanded in the radial direction due to the back tension of the wire W, it is set slightly smaller than the actual gap dimension in consideration of this. As a result, the first gap K <b> 1, which is the minimum penetration gap through which the insulating resin R penetrates in the second wound layer body 105, can be set. Between the second wound layer body 105 and the third wound layer body 105, a second gap K2 that is a minimum permeation gap through which the insulating resin R penetrates is formed. A fourth and n-th wound layer body 105 is formed.

  FIG. 5 shows the frequency characteristic (fZ characteristic) of the impedance in the high frequency coil device. Of the two peaks, the left illustration B is a conventional high-frequency coil device, the resonance point is the frequency f2, the right illustration A is the high-frequency coil device 100 according to the present invention, and the resonance point is f1, and f2 < An example where f1 is high is shown. Since the high frequency coil device 100 according to the present invention has the same inductance and high impedance resonance point f2 <f1 as compared with the conventional high frequency coil device, the low capacitance of the stray capacitance Cs in the high frequency region. Is recognized. Further, the potential between the layer lines can be lowered as compared with the conventional case, and safety can be improved.

  As a result, the high-frequency coil device 100 has α windings as compared with the conventional aligned laminated winding, so that the facing area between successive winding layers is small, and the stray capacitance Cs is proportionally reduced. Since the first gap K1 is set so that R is a gap dimension that can penetrate between the layers of the wound layer body 105, the interlayer stray capacitance Cs decreases in proportion to the size of the gap dimension. Thus, the stray capacitance Cs can be reduced by the amount of the first gap compared to the conventional α winding. Further, since the second gap K2 is set so that the insulating resin R can penetrate between the respective wound layer bodies 105 of the multi-row wound layer portion 110, the stray capacitance Cs is further reduced as a whole. Is done. Furthermore, with the filler in the insulating resin R, the entire multi-row winding layer portion 110 can be integrated to enhance heat dissipation.

  Further, since the first and second gaps K1 and K2 are provided, the insulating resin R can be easily impregnated, and a varnish or the like can be provided in the multi-row winding layer portion 110 without requiring a vacuum impregnation device or the like. The filler of the insulating resin can be infiltrated, and the manufacturing cost can be reduced. Further, it is not necessary to divide the bobbin B into separate windings as in the prior art, and productivity can be improved.

  When this high-frequency coil device 100 is used in, for example, an inverter circuit, an AC ripple potential may be induced in the magnetic body C during driving, but if this induced potential is caused to flow to the ground side, the device side will pass through the stray capacitance Cs. Therefore, it is preferable to place the magnetic body C in a floating state without being grounded by impregnating the entire magnetic body C with the insulating resin R. And the power conditioner that has this inverter circuit and converts the DC power of the solar cell to commercial AC power and supplies AC power to the system can reduce the ground-to-ground leakage current. Can also be prevented.

  6 and 7 show a modification of the multi-row winding layer portion 110 of FIG. In the multi-row winding layer portion 110A of FIG. 6, the second gap K2 between the winding layer bodies is provided intermittently for each one or two winding layer bodies. Specifically, the outermost end on the side of the lead lines Wa and Wb is provided with a second gap K2 for each wound layer body, and the other wound layer bodies are second for each two wound layer bodies. The gap K2 is provided. The multi-row winding layer portion 110B in FIG. 7 is provided intermittently for every two winding layers. In addition, you may provide for every three or more winding layer bodies.

  FIG. 8 is a side view showing a wound layer body of the high-frequency coil device according to the second embodiment, and FIG. 9 is a front view showing the multi-row wound layer portion. As shown in FIG. 8, the wound body 105 </ b> C of the high-frequency coil device according to the second embodiment is provided with a bend F in the wire W to ensure the first gap K <b> 1. A large number of the bends F may be provided intermittently in the circumferential direction. Further, as shown in FIG. 9, due to the bending F, the gap state of the second gap K <b> 2 may change. Other configurations are the same as those of the first embodiment.

  In this embodiment, the wound layer body is a three-layered multi-layer winding, but it may be a two-layer winding or a four-layer or more winding, and is not limited to this. Also, the winding shape may be round, square, ellipse or polygonal.

  In this embodiment, a pair of multi-row winding layer portions 110 are wound around both legs of the letter-shaped magnetic body C (inner iron type). In this case, the pair of multi-row winding layer portions are They may be connected in series or in parallel. Thereby, a predetermined inductance and a direct current resistance value are ensured. Further, instead of winding a pair of multi-row winding layer portions 110 around both legs of the C-shaped magnetic body C (inner iron type), for example, using a magnetic body such as EI type or EE type, One multi-row winding layer portion may be wound around the middle leg portion of the magnetic body (outer iron type).

  As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily consider various changes and modifications within the obvious scope by looking at the present specification. Accordingly, such changes and modifications are to be construed as within the scope of the invention as defined by the appended claims.

100: High-frequency coil device 105: Winding layer body 110: Multi-row winding layer part K1: First gap K2: Second gap R: Insulating resin W: Wire X: Axial direction Y: Radial direction

Claims (7)

A coil for high frequency that has a multi-row winding layer portion in which a plurality of winding layers formed by continuously winding one wire in a spiral shape is arranged in the axial direction, and is driven by a high frequency current,
Between each layer of the wound layer body, a circumferentially continuous gap or an intermittent gap, which is a first radial gap set to a gap dimension through which the insulating resin can penetrate, is provided, Between each winding layer body of the row winding layer portion, a second gap in the axial direction set to a void size through which the insulating resin can permeate is provided,
A high frequency coil in which the insulating resin is impregnated in the first and second gaps.   The high frequency coil according to claim 1, wherein the insulating resin contains a filler having high thermal conductivity.   The high frequency coil device according to claim 1, wherein when the circumferentially continuous gap is formed, the first gap is formed including the back tension of the wire.   2. The high frequency coil according to claim 1, wherein when the partial gap is formed, the first gap includes a back tension of the wire, and is formed by winding the wire after being bent intermittently. A high-frequency coil device according to any one of claims 1 to 4,
A high-frequency coil device in which a magnetic material is inserted into a hollow portion of one or a pair of the multi-row winding layer portions. In claim 5,
A high-frequency coil device in which a magnetic body is inserted into the hollow portions of the pair of multi-row winding layers, and the pair of multi-row winding layers is connected in series or in parallel. In claim 5,
The high frequency coil device, wherein the multi-row winding layer portion and the entire magnetic body are impregnated with an insulating resin.

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