JP2014041962A - Wiring element for noise reduction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smaller and lighter wiring element for noise reduction which can cope with high power and short switching cycle.SOLUTION: A wiring element 1a for noise reduction for reducing prescribed noise includes: a coil 11 which is configured by winding a band-like conductor member so that a width direction of the conductor member is along an axial direction of the coil 11; a magnetic core 12 which allows a magnetic flux generated by the coil 11 to pass therethrough and stores the coil 11; and a magnetic plate member 13 which is arranged so as to cover both end surfaces of the coil 11 in the axial direction. The magnetic core 12 is formed of a first magnetic material which has the first magnetic permeability and the first saturation magnetic flux density. The magnetic plate member 13 is formed of a second magnetic material which has the second magnetic permeability higher than the first magnetic permeability and the second saturation magnetic flux density lower than the first saturation magnetic flux density.

Description

  The present invention relates to a noise reduction winding element that is used to reduce predetermined noise, and particularly to suitably reduce high-frequency noise.

  A motor drive system that drives a motor (motor) by PWM (pulse width modulation) control includes an AC-DC converter that rectifies a three-phase AC voltage into a DC voltage, and a DC power output from the AC-DC converter. And a PWM inverter that performs pulse width modulation by the switching operation, and supplies electric power that has been pulse width modulated so as to have a desired voltage and frequency from the PWM inverter to the motor. In such a motor drive system, the voltage at the neutral line of the motor (the neutral point of the Y connection) does not become zero due to the switching operation of the switching element in the PWM inverter, so a so-called common mode voltage Vinv is generated.

  The common mode voltage is also generated due to various other causes. For example, if the motor is a motor with high cogging or torque ripple (motor with a rotor-stator structure), or if there are individual differences (variations) in each winding of the motor corresponding to each phase of UVW, the geometry of the stator and yoke core If there is a geometric imperfection, if the rotational load such as regenerative operation changes suddenly with respect to the phase, and the cable (including the ground line) between the inverter and the motor is magnetically induced The common mode voltage is also generated when electromagnetic noise is generated.

  This common mode voltage causes high-frequency leakage current that becomes conduction noise and shaft voltage when the motor is driven by an inverter. For this reason, various countermeasures have been studied in order to reduce (including removal) the common mode voltage. One countermeasure is a common mode filter in which a common mode choke coil and a capacitor are combined (see, for example, Patent Document 1).

  The common mode choke coil of this common mode filter is obtained by winding a three-phase winding around a core made of a magnetic material so that the polarity and the number of turns are equal. Alternatively, the common mode choke coil is one or a plurality of cores inserted through three-phase windings. The common mode choke coil cancels out the magnetomotive force due to the three-phase current with respect to the normal mode, so that the inductance becomes zero. On the other hand, the common mode choke coil operates as a large reactor with respect to the common mode.

JP 2010-246391 A

  By the way, when the magnetic flux density of the common mode choke coil exceeds the saturation magnetic flux density, the inductance is drastically reduced and the common mode choke coil does not function. Here, when the carrier period of the inverter is Ti, the direct current is Ed, and the number of turns is N, the interlinkage flux φinv in the case where all the common mode voltage Vinv is applied to the common mode choke is “φinv = (Ed · Ti) / (8N) ”.

  Due to the trend of higher power and shorter switching period of the device, the DC voltage Ed becomes higher or the switching period becomes shorter (the switching frequency becomes higher), and as a result, the flux linkage φinv becomes larger. For this reason, the common mode choke is easily magnetically saturated. On the other hand, in order to reduce the magnetic flux density so that the common mode choke coil is not magnetically saturated, it is necessary to increase the core cross-sectional area S and / or increase the number of turns N of the common mode choke coil. As a result, the common mode choke coil is increased in size and weight.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a noise reduction winding element that is smaller and lighter, corresponding to higher power and shorter switching period. It is to be.

  As a result of various studies, the present inventor has found that the above object is achieved by the present invention described below. That is, the noise reduction winding element according to one aspect of the present invention is a noise reduction winding element for reducing predetermined noise, and the band-shaped conductor member is arranged in the width direction of the conductor member. A coil formed by winding the coil along the axial direction of the coil, a magnetic core generated by the coil, and a magnetic core that houses the coil, and both end surfaces of the coil in the axial direction. The magnetic core is formed of a first magnetic material having a first magnetic permeability and a first saturation magnetic flux density, and the magnetic plate member is formed from the first magnetic permeability. The second magnetic material has a high second magnetic permeability and a second saturation magnetic flux density lower than the first saturation magnetic flux density.

  In such a noise reduction winding element, in order to reduce noise, the magnetic plate member of the second magnetic material mainly functions. On the other hand, when the magnetic plate member of the second magnetic material is magnetically saturated, the first magnetic material The magnetic core functions to reduce noise. For this reason, such a noise reduction winding element can cope with higher power and shorter switching period (higher switching frequency), and further can be reduced in size and weight. .

  In another aspect, the above-described noise reduction winding element further includes a first magnetic cylindrical member that is disposed on the inner peripheral surface of the coil and is formed of the second magnetic material. .

  In such a noise reduction winding element, the first magnetic cylindrical member functions with respect to a relatively small current, so that the noise can be further reduced with respect to a relatively small current.

  In another aspect, the above-described noise reduction winding element further includes a second magnetic cylindrical member disposed on the outer peripheral surface of the coil and formed of the second magnetic material. .

  Such a noise reduction winding element can further reduce noise even with a relatively small current by the function of the second magnetic cylindrical member with respect to a relatively small current.

  In another aspect, in the above-described noise reduction winding element, the first magnetic material is a powder core material obtained by mixing iron powder and resin. According to another aspect, in the above-described noise reduction winding element, the second magnetic material is ferrite. In another aspect, in the above-described noise reduction winding element, the first magnetic material is a material in which the first magnetic permeability is 500 or less and the first saturation magnetic flux density is 1 T or more. The second magnetic material is characterized in that the second magnetic permeability is 1000 or more and the second saturation magnetic flux density is 0.5 T or less.

  In such a noise reduction winding element, the first magnetic material and the second magnetic material are provided relatively easily.

  According to another aspect, in the above-described noise reduction winding element, the coil has a double pancake structure.

  Such a noise reduction winding element can easily draw out the winding start end and winding end of the coil to the outer periphery of the coil, and wiring to the coil becomes easy.

  The noise-reducing winding element according to the present invention can cope with higher power and shorter switching period (higher switching frequency), and can be further reduced in size and weight.

It is a longitudinal cross-sectional view which shows schematic structure of the coil element for noise reduction in 1st Embodiment. It is a figure which shows each B-micrometer characteristic of the dust material and ferrite material which are used for the noise reduction winding element of a 1st embodiment. It is a figure which shows the manufacturing method of the coil element for noise reduction in 1st Embodiment. It is a figure for demonstrating the effect | action of the coil element for noise reduction in 1st Embodiment. It is a figure which shows the equivalent circuit of the coil element for noise reduction in 1st Embodiment. It is FIG. (1) for demonstrating the filter effect | action of the coil element for noise reduction in 1st Embodiment. It is FIG. (2) for demonstrating the filter effect | action of the coil element for noise reduction in 1st Embodiment. It is a figure which shows the magnetic field line of a normal mode. It is a magnetic force line figure which shows the magnetic field analysis result with respect to the coil element for noise reduction of 1st Embodiment. It is a magnetic flux density contour diagram showing a common mode magnetic field analysis result for the noise reduction winding element of the first embodiment when a relatively small current of 30 A is applied. It is a magnetic flux density contour diagram showing a common mode magnetic field analysis result for the noise reduction winding element of the first embodiment when a relatively large current of 120 A is applied. It is a magnetic flux density contour map which shows the magnetic field analysis result of the common mode with respect to the coil | winding element for noise reduction of a comparative example at the time of supplying a comparatively small 30A electric current. It is a magnetic flux density contour map which shows the magnetic field analysis result of the common mode with respect to the coil | winding element for noise reduction of a comparative example at the time of supplying a comparatively large 120 A electric current. It is a figure which shows the inductance characteristic of the coil element for noise reduction in 1st Embodiment. It is a circuit diagram which shows the electrical structure of the power control apparatus using the coil | winding element for noise reduction of embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the coil element for noise reduction in 2nd Embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the coil element for noise reduction in 3rd Embodiment. It is a figure which shows the manufacturing method of the coil element for noise reduction in 4th Embodiment.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. Further, in this specification, when referring generically, it is indicated by a reference symbol without a suffix, and when referring to an individual configuration, it is indicated by a reference symbol with a suffix.

(First embodiment)
First, the configuration of the noise reduction winding element in the first embodiment will be described. FIG. 1 is a longitudinal sectional view showing a schematic configuration of a noise reduction winding element in the first embodiment. FIG. 2 is a diagram showing B-μ characteristics of the dust material and the ferrite material used in the noise reduction winding element of the first embodiment. The horizontal axis in FIG. 2 is the magnetic flux density expressed in T units, and the vertical axis is the relative permeability. FIG. 3 is a diagram illustrating a method of manufacturing the noise reduction winding element according to the first embodiment.

  The noise reduction winding element according to the present embodiment is used to reduce predetermined noise, and is particularly used to suitably reduce high frequency noise. As will be described later, the winding element for noise reduction according to the present embodiment can mainly reduce or eliminate so-called common mode noise, but is also effective and can reduce so-called normal mode noise. .

  Such a noise reduction winding element 1a of the present embodiment includes, for example, a coil 11, a magnetic core 12, and a magnetic plate member 13, as shown in FIG.

  The coil 11 is configured by winding a long strip-shaped conductor member with an insulating member (not shown) interposed therebetween so that the width direction of the conductor member is along the axial direction of the coil 11 (flatwise winding). Line structure). Such a strip-like long conductor member has a sheet shape, a ribbon shape or a tape shape, and a thickness (length in the thickness direction, length in the thickness direction, radial direction) with respect to the width (length in the width direction, length in the axial direction) W. Length) t is less than 1 (0 <t / W <1). The conductor member of the coil 11 can be formed of various conductive materials, but from the viewpoint of good conductivity, good heat conductivity, etc., for example, metal materials (including alloys) such as copper and aluminum Is preferred. And since the strip | belt-shaped conductor member will be arrange | positioned along the magnetic flux direction which arises with the coil 11 in the coil 11 of such a structure, what is called eddy current loss of the coil 11 can be reduced.

  And the coil 11 is provided with the some subcoil in order to respond | correspond to a some phase. In the present embodiment, the coil 11 includes first to third subcoils 111, 112, and 113 in order to correspond to three phases.

  In addition, since the coil 11 having such a structure has a band-like conductor member, the facing area between adjacent conductor members can be increased, and thus the coil 11 itself has a distributed capacitance. For this reason, since the distributed constant circuit of L and C is formed with this structure coil, the filter characteristic excellent in the high frequency range is realizable. In order to make the electrostatic capacity of the coil 11 a predetermined capacity, a material having an appropriate dielectric constant is selected as the insulating member of the coil 11. For example, examples of the insulating member of the coil 11 include PET (polyethylene terephthalate), PP (polypropylene), PPS (polyphenylene sulfide resin), PEN (polyethylene naphthalate), filler-filled resin, and the like. The dielectric constants of these PET, PP, PPS, and PEN are 3.2, 2.2, 3.0, and 2.9, respectively, at 20 ° C. at 1 kHz. Further, the resin containing filler can have various values of dielectric constant in the range of about 5 to 40 by changing the filling rate (volume%) of the filler.

  The magnetic core 12 is a member that allows the magnetic flux generated by the coil 11 to pass therethrough and accommodates the coil 11. In this embodiment, the magnetic core 12 is a cylindrical member with a lid and a bottom, and includes, for example, first and second core members 121 and 122 having the same structure. These first and second core members 121 and 122 are magnetically (for example, magnetic permeability) isotropic, for example, respectively, on the plate surfaces of the disk portions 121a and 122a having a disk shape, for example. Cylindrical parts 121b and 122b having an outer peripheral surface having the same diameter as the disk parts 121a and 122a are continuously formed. The magnetic core 12 is configured such that the first and second core members 121 and 122 having such a configuration are overlapped with each other so that there is almost no gap between the end surfaces of the cylindrical portions 121b and 122b. A space for accommodating the plate member 13 is provided. That is, the magnetic core 12 of the present embodiment has a structure including the coil 11 and the magnetic plate member 13 and is a so-called pot type.

  In the above description, the magnetic core 12 includes the first and second core members 121 and 122. However, the magnetic core 12 is not limited thereto. For example, the magnetic core 12 includes the coil 11 and the magnetic plate member 13. An eleventh core member having a hollow columnar shape (cylindrical shape) having an inner diameter that can be included, and a pair of twelfth and thirteenth core members that are disks whose outer diameter is larger than the inner diameter of the eleventh core member. And the twelfth core member is connected to one end of the eleventh core member so that a substantial gap is not generated, and the thirteenth core member is the other end of the eleventh core member so that a substantial gap is not generated. It may be configured to be connected to.

  Such a magnetic core 12 is made of, for example, a first magnetic material having predetermined magnetic characteristics according to specifications and the like, a predetermined first magnetic permeability μ1, and a first saturation magnetic flux density Bs1. The first magnetic material is, for example, a soft magnetic powder from the viewpoint of ease of forming the desired shape as described above, and the magnetic core 12 is preferably formed of this soft magnetic powder. The noise reduction winding element 1a including the magnetic core 12 can easily form the magnetic core 12, and the iron loss can be reduced. For example, the first magnetic material is a mixture of soft magnetic powder and non-magnetic powder, and the magnetic core 12 may be a mixture of the soft magnetic powder and non-magnetic powder. Good. Such a first magnetic material can adjust the mixing ratio of the soft magnetic powder and the non-magnetic powder relatively easily, and by appropriately adjusting the mixing ratio, Predetermined magnetic characteristics can be easily achieved to each desired magnetic characteristic.

  The soft magnetic powder is a ferromagnetic metal powder. More specifically, for example, pure iron powder, iron-based alloy powder (Fe-Al alloy, Fe-Si alloy, Sendust, Permalloy, etc.) and amorphous powder are used. In addition, iron powder having an electrical insulating film such as a phosphoric acid-based chemical film formed on the surface thereof can be used. These soft magnetic powders can be produced by a known means, for example, a method of making fine particles by an atomizing method or the like, a method of finely pulverizing iron oxide or the like and then reducing it. In general, since the saturation magnetic flux density is large when the magnetic permeability is the same, the soft magnetic powder is particularly preferably a metal-based material such as the above pure iron powder, iron-based alloy powder, and amorphous powder.

  The nonmagnetic powder is a resin powder. Therefore, as an example of the first magnetic material, a powder core material in which iron powder and resin are mixed can be cited.

  The magnetic core 12, which is a dust core formed with such a soft magnetic powder (including a mixture of soft magnetic powder and non-magnetic powder), is formed by known conventional means such as dust formation, for example. Can do.

  The noise reduction winding element 1a using such a so-called dust core for the magnetic core 12 can reduce eddy current loss. In particular, when the noise reduction winding element 1a is used in a high frequency drive circuit, the noise reduction winding element 1a can preferably reduce eddy current loss.

  The magnetic plate member 13 is a member disposed so as to cover both end faces of the coil 11 in the axial direction. More specifically, the magnetic plate member 13 is arranged so as to cover one end surface of the coil 11 in the axial direction, and the first magnetic annular plate 131 formed in an annular plate shape and the other end surface of the coil 11 in the axial direction. And a second magnetic annular plate 132 formed in an annular plate shape. The outer diameters of the first and second magnetic annular plates 131 and 132 are substantially equal to the outer diameter of the coil 11, and the diameter of the circular hole formed in the center is substantially equal to the diameter of the air core portion in the coil 11.

  The magnetic plate member 13 (the first and second magnetic annular plates 131 and 132) is, for example, a second member having predetermined magnetic characteristics according to specifications and the like, a predetermined second magnetic permeability μ2, and a second saturation magnetic flux density Bs2. It is formed from a magnetic material. The second magnetic permeability μ2 is higher than the first magnetic permeability μ1 in the first magnetic material of the magnetic core 12 (μ2> μ1). Further, the second saturation magnetic flux density Bs2 is lower than the first saturation magnetic flux density Bs in the first magnetic material of the magnetic core 12. The second magnetic material of such a magnetic plate member 13 is preferably ferrite which exhibits ferromagnetism and is a ceramic mainly composed of iron oxide.

  Of the compacts (high density compact (◇) and low density compact (x)) and ferrite (□) used suitably for the magnetic core 12 and the magnetic plate member 13 in the noise reduction winding element 1a of the present embodiment. The relationship (B-μ characteristic) between each magnetic flux density and relative permeability is shown in FIG. Preferably, the first magnetic material is a material having a first permeability μ1 of 500 or less and a first saturation magnetic flux density Bs1 of 1T or more, and the second magnetic material has a second permeability μ2 of 1000 or more. The second saturation magnetic flux density Bs2 is 0.5T or less. More preferably, the first magnetic material is a material having a first permeability μ1 of 50 or less and a first saturation magnetic flux density Bs1 of 1T or more, and the second magnetic material has a second permeability μ2 of 4000. The second saturation magnetic flux density Bs2 is 0.4T or less.

  The noise reduction winding element 1a having such a structure can be manufactured, for example, by the following process. In the following description, the three-phase noise reduction winding element 1a will be described. However, a single-phase noise reduction winding element and a multi-phase noise reduction winding element can be similarly manufactured. .

  First, as shown in FIG. 3A, ribbon-shaped three conductor members 111, 112, 113 having a predetermined thickness and corresponding to the number of phases are overlapped with an insulating member (not shown) interposed therebetween. Further, as shown in FIG. 3B, these are wound a predetermined number of times from a position separated from the center (axial core) by a predetermined diameter. Thereby, the air core coil 11 of the single pancake structure provided with the columnar air core part S1 which has a predetermined diameter in the center is formed.

  Next, as shown in FIG. 3C, a first magnetic annular plate 131 is disposed on one end face of the coil 11 in the axial direction so as to cover the one end face, and on the other end face of the coil 11 in the axial direction. A second magnetic annular plate 132 is disposed so as to cover the other end face. Then, the first and second core members 121 and 122 formed by compacting or the like are arranged so that the coils 11 whose both end surfaces are covered by the first and second magnetic annular plates 131 and 132 are sandwiched between the cylinders. The end surfaces of the parts 121b and 122b are overlapped with each other. Thereby, for example, a disk-shaped noise reduction winding element 1a as shown in FIG.

  Next, the operation of the noise reduction winding element in the first embodiment will be described. FIG. 4 is a diagram for explaining the operation of the noise reduction winding element in the first embodiment.

  The noise reduction winding element 1a having the above-described configuration can cope with higher power and shorter switching period (higher switching frequency), and can be further reduced in size and weight. More specifically, the noise reduction winding element 1a of the present embodiment is configured by the following logic.

  As described above, the common mode voltage is reduced or eliminated by the common mode filter in which the common mode choke coil and the capacitor are combined. For example, as shown in FIG. 4A, the common mode choke coil includes one or a plurality (four in the example shown in FIG. 4A) formed of a magnetic material through which a three-phase wiring is inserted. It consists of an annular (ring-shaped) core.

  In such a common mode choke coil, the core cross-sectional area S is increased by increasing the number of cores, as shown in FIG. As shown in FIG. 4D, the number of turns N is increased. When such a countermeasure is simply implemented, the common mode choke coil is increased in size and weight as described above.

  Therefore, as shown in FIG. 4C, the plurality of cores includes a plurality of types of cores formed of magnetic materials having different magnetic characteristics. That is, as shown in FIG. 4 (C), the core is relatively distant from the core of the first magnetic material (low μ / high Bs) having relatively low permeability μ and relatively high saturation magnetic flux density Bs. It consists of a core of a second magnetic material (high μ / low Bs) having a high permeability μ and a relatively low saturation magnetic flux density Bs. In such a plurality of types of cores made of a plurality of magnetic materials, relatively high frequency noise is reduced or eliminated by the core of the first magnetic material (low μ / high Bs), and the frequency component that could not be removed by this core. Is reduced or eliminated by the core of the second magnetic material (high μ / low Bs). In the present embodiment, as described above, the magnetic core 12 is formed of the first magnetic material, and the magnetic plate member 13 is formed of the second magnetic material. For example, in the noise reduction winding element 1a using the magnetic core 12 of the dust core and the magnetic plate member 13 of ferrite having the B-μ characteristic shown in FIG. The ferrite magnetic plate member 13 having a high relative permeability μ2 functions to reduce or eliminate noise, and when the magnetic flux density exceeds about 0.5 T, the powder compact functions as an inductance even in such a magnetic flux density range. The magnetic core 12 of the core functions to reduce or eliminate noise.

  In the noise reduction winding element 1a of the present embodiment, the magnetic plate member 13 for realizing a plurality of types of cores is arranged in the axial direction of the coil 11 as shown in FIG. 4 (F) and FIG. It is arranged so as to cover both end faces, and is enclosed by the magnetic core 12.

  Therefore, in the winding element for noise reduction 1a of the present embodiment, not only a plurality of types of cores are used, but also such a structure is adopted, so that it corresponds to high power and short switching period. Thus, further downsizing and lighter weight can be realized.

  Furthermore, in the noise reduction winding element 1a of the present embodiment, the coil 11 is wound with a strip-shaped long conductor member with an insulating member interposed so that the width direction of the conductor member is along the axial direction of the coil 11. It is composed by turning. For this reason, the noise reduction winding element 1a of the present embodiment can widen the facing area between adjacent strip-shaped conductor members in the coil 11, and the coil 11 itself has a distributed capacitance. . For this reason, the noise reduction winding element 1a according to the present embodiment is a single common mode filter without requiring a separate capacitor. Therefore, the noise reduction winding element 1a of the present embodiment can be further reduced in size and weight.

  Next, characteristic analysis of the noise reduction winding element in the first embodiment will be described. FIG. 5 is a diagram showing an equivalent circuit of the noise reduction winding element in the first embodiment. The noise reduction winding element 1a of the present embodiment is represented by a distributed constant circuit of an inductor and a capacitor, but in FIG. 5, for the sake of simplicity, it is represented by a concentrated circuit of an inductor and a capacitor. . FIG. 6 is a diagram (part 1) for explaining the filter action of the noise reduction winding element according to the first embodiment. FIG. 7 is a diagram (No. 2) for explaining the filter action of the noise reduction winding element according to the first embodiment. FIG. 8 is a diagram showing lines of magnetic force in the normal mode. FIG. 9 is a magnetic force diagram showing a magnetic field analysis result for the noise reduction winding element of the first embodiment. FIG. 9A shows the result of the common mode when a relatively small current of 30 A is applied to the coil 11, and FIG. 9B is a case where a relatively large current of 120 A is applied to the coil 11. It is the result of the common mode in. FIG. 9C shows the result of the normal mode when a relatively small current of 30 A is supplied to the coil 11, and FIG. 9D is a case where a relatively large current of 120 A is supplied to the coil 11. It is the result of the normal mode in. FIG. 10 is a magnetic flux density contour diagram showing a common mode magnetic field analysis result for the noise reduction winding element of the first embodiment when a relatively small current of 30 A is applied. FIG. 11 is a magnetic flux density contour diagram showing a common mode magnetic field analysis result for the noise reduction winding element of the first embodiment when a relatively large current of 120 A is applied. FIG. 12 is a magnetic flux density contour diagram showing a common mode magnetic field analysis result for the noise reduction winding element of the comparative example when a relatively small current of 30 A is applied. FIG. 13 is a magnetic flux density contour diagram showing a common mode magnetic field analysis result for the noise reduction winding element of the comparative example when a relatively large current of 120 A is applied. FIG. 14 is a diagram illustrating inductance characteristics of the noise reduction winding element according to the first embodiment. The horizontal axis in FIG. 14 is the current expressed in units of A, and the vertical axis is the inductance expressed in units of μH.

  As shown in FIG. 5, the equivalent circuit of the noise reduction winding element 1a having the above-described configuration includes an inductor Lu having an inductance Lu corresponding to the U-phase subcoil 111, a U-phase subcoil 111, and a V-phase subcoil 112. Of the mutual inductance Mvw between the transformer Muv of the mutual inductance Muv and the capacitor Cuv of the capacitance Cuv, the inductor Lv of the inductance Lv corresponding to the V-phase subcoil 112, and the V-phase subcoil 112 and the W-phase subcoil 113. Transformer Mvw and capacitor Cvw of capacitance Cvw, inductor Lw of inductance Lw corresponding to W-phase subcoil 113, and transformer of mutual inductance Mwu between W-phase subcoil 113 and U-phase subcoil 111 And a capacitor Cwu of wu and capacitance Cwu.

  The inductor Lu is connected in parallel to the primary side of the transformer Muv, and the primary side of the transformer Mwu is connected in series, and the primary side of the transformer Mvw is connected in series to the secondary side of the transformer Muv. The inductor Lv is connected in parallel to the primary side of the transformer Mvw, and the secondary side of the transformer Mwu is connected in series to the secondary side. An inductor Lw is connected in parallel to the secondary side of the transformer Mwu. The capacitor Cuv is connected between the primary side and the secondary side of the transformer Muv, the capacitor Cvw is connected between the primary side and the secondary side of the transformer Mvw, and the capacitor Cwu is connected to the transformer Mwu. Are connected between the primary side and the secondary side.

  FIG. 5 also shows an inverter IV and a motor M in addition to the equivalent circuit of the noise reduction winding element 1a. Harmonic components of the inverter IV, load fluctuations of the motor M, electromagnetic noise, and the like cause noise.

As shown in the left side of FIG. 6 (A) and FIG. 7 (B), the common mode current flows from a power supply (not shown) through a wire passing through the core and returns to the power supply at ground (ground). In the magnetic circuit, as shown on the left side of FIG. 6B, a magnetic field having a direction corresponding to the direction of the current flowing through the wiring and the ground is generated, and the magnetic field lines for the common mode current are shown in FIG. 6C and FIG. As shown in A), it passes through the entire magnetic core 12. The magnetic field line Zcom for the common mode current can be approximated to ω × Lc when the angular frequency of the current is ω and the inductance acting on the common mode current is Lc, as shown in FIG. 7B. (Zcom≈ω × Lc). The inductance Lc acting on the common mode current is defined by the inductance definition formula and the lines of magnetic force are concentrated on the magnetic core 12, so that the number of turns of the coil 11 corresponding to the three phases of the UVW phase is N and the amplitude of the magnetic flux density is | B |, where the radius of the core of the coil 11 is rc, and the amplitude of the current flowing through the coil 11 is | I |, N × π × rc ² × <| B |> / | I | (Lc = N × π × rc ² × <| B |> / | I |). Here, <A> is an operator representing the average of A.

  On the other hand, as shown in the right side of FIG. 6 (A) and FIG. 7 (B), the normal mode current flows from one power source (not shown) through one wiring passing through one core and the other wiring passing through the other core. Flows back to the power source. In the magnetic circuit, as shown on the right side of FIG. 6B, a magnetic field having a direction corresponding to the direction of the current flowing through each of the wirings is generated, and the magnetic lines of force for the normal mode current are shown in FIGS. 6C and 7A. ) And a pair of magnetic plate members 131 and 132 through the coil 11, as shown in FIG. As shown in FIG. 7 (B), the magnetic field lines Znomal for the normal mode current are ω × (when the angular frequency of the current is ω, the inductance acting on the normal mode current is Ln, and the mutual inductance is Mc. 2Lc-2Mc + 2Ln˜ω × 2Ln can be approximated (Znmal≈ω × 2Ln) The inductance Ln acting on the normal mode current is defined by the inductance definition equation and the U-phase current Iu is I (Iu = I). Considering the phase in which the currents Iv and Iw of the V phase and the W phase are −I / 2 (Iv = Iw = −I / 2), the magnetic lines of force are between the U-V line and the W-U line as shown in FIG. Since the amplitude of the magnetic flux density between the U-V lines is | Buv |, the radius of the core of the coil 11 is rc, the outer diameter of the coil 11 is ro, and the U-V line When the interval of s is s, it is expressed as N × π × (rc + ro) × s × <| Buv |> / | I | (Ln = N × π × (rc + ro) × s × <| Buv |> 8, the lines of magnetic force are represented by alternate long and short dash lines, and the magnetic flux density is represented by a solid line.

  The magnetic field analysis results for such analysis results are shown in FIGS. 9 and 13, and the inductance characteristics are shown in FIG. The number of turns of the coil 11 in this analysis is 5 turns. In the common mode, the result of the static magnetic field under the conditions Iu and Iv = Iw = 0 is shown. In the normal mode, the result of the static magnetic field under the conditions Iu and Iv = Iw = −Iu / 2 is shown.

  As can be seen from FIG. 9, in the case of the common mode, the magnetic lines of force are concentrated on the magnetic plate member 13 of ferrite as compared with other portions at a small current of 30 A, and the effect of inserting it into the magnetic core 12 is confirmed. The Further, at a large current of 120 A, most of the magnetic field lines are contained in the magnetic core 12 of dust. On the other hand, in the normal mode, the lines of magnetic force are substantially the same regardless of the small current and the large current. Therefore, it can be seen that even if the ferrite magnetic plate member 13 is inserted into the magnetic core 12, the characteristics of the normal mode filter are not affected. As can be seen from FIGS. 10 to 13, in the case of the common mode and the large current, as compared with the case of only the magnetic core 12 of the dust compact of the comparative example (FIGS. 12 and 13), the embodiment When the magnetic plate member 13 of ferrite is inserted into the magnetic plate member 13 (FIGS. 10 and 11), it can be seen that local magnetic saturation is reduced in the outer peripheral portion of the coil 11. That is, it can be seen that by inserting the ferrite magnetic plate member 13 into the magnetic core 12, iron loss due to magnetic saturation can be reduced.

  In FIG. 14, Example 1 is a noise reduction winding element 1 a 1 in which the magnetic core 12 is formed of high-density powder and the magnetic plate member 13 is formed of ferrite, and the inductance characteristic with respect to the common mode current is The inductance characteristics with respect to the normal mode current are indicated by |. Example 2 is a noise reduction winding element 1a2 in which the magnetic core 12 is formed of low-density powder and the magnetic plate member 13 is formed of ferrite, and the inductance characteristic with respect to the common mode current is indicated by *. The inductance characteristics with respect to the normal mode current are indicated by □.

  Further, Comparative Example 1 is a conventional noise reduction winding element that does not have the magnetic plate member 13, and the magnetic core 12 is formed of ferrite, and the inductance characteristic with respect to the common mode current is indicated by ■. The inductance characteristics with respect to the normal mode current are indicated by x. Comparative Example 2 is a noise reduction winding element that does not have a magnetic plate member 13 as a comparison between Example 1 and Example 2 (the technique proposed by the applicant of this application in Japanese Patent Application No. 2012-100739, which is a conventional technique. However, the magnetic core 12 is formed of high-density dust, and the inductance characteristic with respect to the common mode current is indicated by ◆, and the inductance characteristic with respect to the normal mode current is indicated by ●.

  As can be seen from FIG. 14, in the noise reduction winding element of Comparative Example 1, the inductance L greatly decreases due to magnetic saturation as the current Iu increases. In the noise reduction winding elements 1a1 and 1a2 of the first and second embodiments corresponding to the reduction winding element 1a, the reduction in the inductance L is relatively small even when the current Iu increases.

  Further, at a relatively small current, the noise reduction winding elements 1a1 and 1a2 of the first and second embodiments can obtain a larger inductance than the noise reduction winding element of the second comparative example. As a result, better filter characteristics can be obtained.

  As can be seen from FIG. 14, the noise reduction winding elements 1a1 and 1a2 of the first and second embodiments are equivalent to the noise reduction winding elements of the first and second comparison examples with respect to the normal mode current. Shows the effect.

  Next, an application example in which the above-described noise reduction winding element 1a of the first embodiment is applied to an apparatus will be described.

(Example of application)
The winding element for noise reduction 1a of the first embodiment can be applied to various devices in order to reduce predetermined noise, and particularly preferably to reduce high-frequency noise, but here, it is supplied to a load. It is used in a power control device PC that controls the power to be generated.

  FIG. 15 is a circuit diagram illustrating an electrical configuration of a power control apparatus using the noise reduction winding element of the embodiment. This power control device PC controls the power supplied to the load by controlling, for example, the voltage and frequency of the power supplied from the power source. For example, as shown in FIG. The inverter section IV, the casing HS housing the converter section CV and the inverter section IV, and the noise reduction winding elements FT1 and FT2 are provided in order to remove or reduce high frequency noise.

  The converter unit CV is a device that boosts or lowers the voltage of power supplied from the power supply Vd. The converter unit CV is, for example, a so-called chopper type DC-DC converter circuit including a choke coil L4, a smoothing capacitor C4, a diode D41, a switching element Tr4, and a free wheel diode (freewheel diode) D42. The switching element Tr4 is a power transistor element such as an insulated gate bipolar transistor (IGBT) element or a power MOSFET element. Here, a high-power IGBT element is used as the switching element Tr4. The collector terminal of the IGBT element Tr4 is connected to the anode terminal of the diode D41, the emitter terminal is connected to the ground line (N line), and the gate terminal is a converter (not shown) that controls the on / off timing of the IGBT element Tr4. Connected to the control circuit. A free-wheeling diode D42 is connected in parallel between the collector terminal and the emitter terminal of the IGBT element Tr4. That is, the cathode terminal of the reflux diode D42 is connected to the collector terminal of the IGBT element Tr4, and the anode terminal of the reflux diode D42 is connected to the emitter terminal of the IGBT element Tr4. Thus, the direction of the free-wheeling diode D42 is connected in the opposite direction to the input / output direction of the IGBT element Tr4. A series connection circuit of the diode D41 and the switching element Tr4 is connected in parallel to both ends of the smoothing capacitor C4. A choke coil L4 is inserted in the power supply line (P line). That is, one terminal of the choke coil L4 is connected to the output terminal on the power supply line side of the noise reduction winding element FT1, and the other terminal of the choke coil L4 is a collector terminal and a diode of the IGBT element Tr4. It is connected to the connection point with the anode terminal of D41.

  In such a converter unit CV, when the switching element Tr4 is turned on, energy from the power source Vd is accumulated in the choke coil L4, and when the switching element Tr4 is turned off, energy accumulated in the choke coil L4 is released. As a result, the voltage of the choke coil L4 is added to the voltage of the power supply Vd to convert the voltage level, and the voltage is output while being smoothed by the smoothing capacitor C4 via the diode D41. Both ends of the smoothing capacitor C4 are output terminals of the converter unit CV.

  The inverter unit IV is a device that converts DC power into AC power. The inverter unit IV is connected to the output terminal of the converter unit CV, that is, both ends of the smoothing capacitor C4. The inverter unit IV includes, for example, a plurality of switching elements Tr5 and a plurality of free-wheeling diodes D5 connected to each of the plurality of switching elements Tr5. In this embodiment, for example, since the load is a three-phase induction motor M, an integer of 6 (= 3 × 2) is used to generate three-phase AC power of U phase, V phase, and W phase from DC power. There are twice as many switching elements Tr5 and as many free-wheeling diodes D5 as switching elements Tr5. More specifically, in order to increase the amount of current (in order to increase the capacity), there are three sets of six switching elements Tr5 and six free-wheeling diodes D5 corresponding to the three phases in the circumferential direction. Since three layers are prepared in the stacking direction, the inverter unit IV includes 6 × 3 sets × 3 layers = 54 switching elements Tr5 and 54 free-wheeling diodes D5. FIG. 15 shows a set of six switching elements Tr5 and six free-wheeling diodes D5 for the sake of simplification of description. Hereinafter, the inverter unit IV will be described along the example shown in FIG. The electrical configuration of will be described. The switching element Tr5 (Tr51 to Tr56) is a power transistor element such as an IGBT element or a power MOSFET element similarly to the switching element Tr4. Here, a high power IGBT element is used as the switching element Tr5. ing.

  The IGBT element Tr51 and the IGBT element Tr54 are connected in series by connecting the emitter terminal of the IGBT element Tr51 to the collector terminal of the IGBT element Tr54, and a pair of switching units (for example, switching for the U phase) Part). Similarly, the IGBT element Tr52 and the IGBT element Tr55 are connected in series by connecting the emitter terminal of the IGBT element Tr52 to the collector terminal of the IGBT element Tr55, and a pair of switching units (for example, V-phase switches) The IGBT element Tr53 and the IGBT element Tr56 are connected in series by connecting the emitter terminal of the IGBT element Tr53 to the collector terminal of the IGBT element Tr56. Switching unit (for example, a switching unit for the W phase). The gate terminals of the IGBT elements Tr51 to Tr56 are connected to an inverter control circuit (not shown) that controls the on / off timing of the IGBT elements Tr51 to Tr6. The free-wheeling diodes D51 to D56 are connected in parallel to the IGBT elements Tr51 to Tr56, respectively, with the anode terminal connected to the emitter terminal and the cathode terminal connected to the collector terminal. That is, these free-wheeling diodes D51 to D56 are connected in directions opposite to the input / output directions of the IGBT elements Tr51 to Tr56, respectively.

  The series connection circuit of the IGBT element Tr51 and the IGBT element Tr54, the series connection circuit of the IGBT element Tr52 and the IGBT element Tr55, and the series connection circuit of the IGBT element Tr53 and the IGBT element Tr56 are connected in parallel to each other. The output terminal of the part CV is connected to both ends of the smoothing capacitor C4. In other words, the collector terminals of the IGBT element Tr51, the IGBT element Tr52, and the IGBT element Tr53 are connected to one end of the smoothing capacitor C4, and the IGBT element Tr54, the IGBT element Tr55, and the IGBT element are connected to the other end of the smoothing capacitor C4. Each emitter terminal of Tr56 is connected.

  Such an inverter unit IV converts DC power to three-phase AC power by turning on and off the IGBT elements Tr51 to Tr56 at appropriate timings under the control of the inverter control circuit (not shown). Then, from each connection point of each series connection circuit, that is, a connection point between the IGBT element Tr51 and the IGBT element Tr54, a connection point between the IGBT element Tr52 and the IGBT element Tr55, and a connection between the IGBT element Tr53 and the IGBT element Tr56. From each connection point, the U-phase, V-phase, and W-phase power of the inverter unit 5 is output.

  The housing HS is a member that houses the converter unit CV and the inverter unit IV. More specifically, the housing HS includes, for example, a substantially closed housing body having a cylindrical shape with a bottom and a lid, first and second bus bars arranged in the housing body, and the housing And one or more mounting members disposed in the body.

  The first and second bus bars are for power feeding, and are arranged coaxially with the axis of the housing body (housing HS) and extend in the direction of the axis of the housing body (housing HS). It is a real or hollow column-shaped member, and is formed of a conductive metal (including an alloy). The first and second bus bars are hollow cylindrical members arranged coaxially with each other, that is, a cylindrical member. The second bus bar is formed by providing a gap or an insulating layer, for example. The first bus bar is inserted through the first bus bar while being electrically insulated from the first bus bar. As described above, the first and second bus bars have a double cylindrical shape. The first bus bar is, for example, a P bus bar serving as a power supply line (P line), and the second bus bar is an N bus bar serving as a ground line.

  The mounting member is a member for mounting the above-described circuit components constituting the converter unit CV and the inverter unit IV. In this embodiment, in order to mount the circuit component in the space (space) formed between the peripheral wall (peripheral surface) of the cylindrical casing body and the first and second bus bars, The member is, for example, a disk-shaped member in which a through hole (through opening) for inserting the first and second bus bars is formed at the center. The mounting member is arranged such that one main surface (front surface) and the other main surface (back surface) for mounting the circuit component are orthogonal to the axis of the housing body. In this embodiment, the mounting member is composed of four members, one member for mounting the circuit component of the converter unit CV and three members for mounting the circuit component of the inverter unit IV. These four mounting members are stacked in the axial direction (axial direction) in order from the one end side to the other end side of the casing body with an interval at which the circuit components can be placed. Yes.

  In order to dissipate the heat generated in the circuit parts of the converter unit CV and the inverter unit IV to the outside of the housing HS, the outer peripheral end portion of the mounting member uses the heat conducted through the mounting member. In order to efficiently conduct heat to the casing main body, the inner peripheral surface is in contact with the peripheral wall of the casing main body. In this embodiment, the fitting recessed part along the circumferential direction is formed in the internal peripheral surface of the surrounding wall of the said housing body, and the outer peripheral edge part of the said member for mounting is engage | inserted by this fitting recessed part. With this fitting recess, the heat conducted through the mounting member can be more efficiently conducted to the housing body, and the mounting member can be positioned and supported.

  Further, in order to electrically connect the circuit parts of the converter unit CV and the inverter unit IV to the first and second bus bars, the first and second bus bars each have a plurality of branch portions in the circumferential direction. Is provided. By providing such a plurality of branch portions, the power supply path from the first and second bus bars to the circuit components constituting the inverter portion IV is simply configured with the shortest distance. Therefore, such a configuration shortens the wiring length and reduces the wiring inductance.

  Moreover, low inductance can be realized by the double cylindrical type first and second bus bars. The reason is that the inductance is equivalent to the volume integral in which the magnetic field generated by the current exists. This is because the parallel conducting wire and the parallel plate inevitably leak a magnetic field into the nearby space, resulting in a non-negligible stray inductance, but the coaxial conductor is limited to a small space in the gap.

  And in order to take out the three-phase (U phase, V phase, W phase) output of the inverter part IV, the output bus-bar is provided. More specifically, the output bus bar is a long rod-shaped (cylindrical) member, and is formed of a conductive metal (including an alloy) such as pure copper, pure aluminum, or a low concentration alloy thereof, for example. Is done. In the present embodiment, the lot-shaped output bus bars are for U-phase, V-phase, and W-phase corresponding to three-phase AC power, and each output bus bar for each phase Are arranged at a predetermined interval in the radial direction for insulation from the first bus bar so that the longitudinal direction is along the axial direction of the first bus bar. The output bus bars for each phase are arranged at a predetermined interval in the circumferential direction of the first bus bar. The U-phase output bus bar is connected to the emitter terminal of the IGBT element Tr51 and the collector terminal of the IGBT element Tr54. The V-phase output bus bar is connected to the emitter terminal of the IGBT element Tr52 and the IGBT element Tr55. The collector terminal of the IGBT element Tr53 and the collector terminal of the IGBT element Tr56 are connected to the W-phase output bus bar. Thus, since each output bus bar for each phase is three-dimensionally wired around the first bus bar, so-called stray inductance can be reduced.

  The noise reduction winding elements FT1 and FT2 are elements for reducing high-frequency noise, and are the noise reduction winding element 1a of the first embodiment described above. In the example shown in FIG. 15, the coil 11 in the noise reduction winding elements FT1 and FT2 (noise reduction winding element 1a) includes a power supply line and a ground line on the input side of the power control apparatus PC, and the power control apparatus PC. Since the coil 11 is used for a plurality of U-phase lines, V-phase lines, and W-phase lines on the output side, the coil 11 is composed of a plurality of strip-like long conductors stacked with an insulating material (not shown) interposed therebetween. In the example shown in FIG. 15, the member is constituted by a plurality of coils formed by winding three long conductor members 111, 112, 113 a predetermined number of times as shown in FIG.

  And the noise reduction winding element 1a as the noise reduction winding element FT1 is inserted in the wiring between the power source Vd and the converter unit CV of the power control device PC, and the noise reduction winding element FT2 is used as the noise reduction winding element FT2. The noise reduction winding element 1a is inserted in the wiring between the inverter part IV of the power control device PC and the three-phase induction motor M. In this way, the noise reduction winding element 1a (FT1) is inserted in the wiring between the power supply Vd and the converter CV of the power control apparatus PC, so that harmonic noise from the power control apparatus PC to the power supply Vd side is obtained. Can be reduced or eliminated, and spikes and surges in voltage and current from the power supply Vd side to the power control device PC can be reduced or eliminated. Further, by inserting the noise reduction winding element 1a (FT2) in the wiring between the inverter part IV of the power control device PC and the three-phase induction motor M, the noise is reduced or eliminated, and the voltage waveform and current are reduced. Waveform can be improved and load performance can be improved.

  More specifically, first, the case of the noise reduction winding element 1a as the noise reduction winding element FT1 will be described. The input terminal of the noise reduction winding element 1a is connected to the power source Vd to reduce noise. The output end of the winding element 1a is connected to the input end of the power control device PC (input end of the converter unit CV), so that the input end of the noise reduction winding element 1a becomes the input end of the power control device PC (converter unit). The noise reduction winding element 1a is integrated with the housing body (housing HS). More specifically, one end Tm11 on the input side of the coil 111 in the coil 11 of the noise reduction winding element 1a is connected to the power supply line of the power source Vd, and the output of the coil 111 in the coil 11 of the noise reduction winding element 1a. The other end portion Tm12 on the side is connected to one end of a choke coil L4 that serves as an input end in the converter portion CV of the power control apparatus PC. One end Tm31 on the input side of the coil 113 in the coil 11 of the noise reduction winding element 1a is connected to the ground line of the power source Vd, and the other end on the output side of the coil 113 in the coil 11 of the noise reduction winding element 1a. The part Tm32 is connected to the ground line at the input end of the converter part CV of the power control apparatus PC. The one end Tm21 on the input side and the other end Tm22 on the output side of the coil 112 of the coil 11 of the noise reduction winding element 1a are each grounded. Then, the noise reduction winding element 1a is configured so that the surface of the magnetic core 12 from which the output end of the coil 11 is drawn is brought into contact with the case body in the case HS of the power control device PC. It is integrated with (housing HS). In order to further reduce radiation noise, it is preferable that the surface of the magnetic core 12 is in contact with the casing body without gaps, that is, in close contact. From this point of view, the second core member 122 of the magnetic core 12 is preferably formed integrally with the housing body. Alternatively, a recess for fitting the noise reduction winding element 1a is formed in the casing body, and the noise reduction winding element 1a is fitted into the recess so that the noise reduction winding element 1a is It may be integrated with the main body (housing HS). Furthermore, it is preferable that the noise reduction winding element 1a is integrated with the housing main body at a position where the axis thereof coincides with the axis of the housing main body (housing HS). As a result, the noise reduction winding element 1a has the same axis as that of the first and second bus bars.

  Next, the case of the noise reduction winding element 1a as the noise reduction winding element FT2 will be described. The input end of the noise reduction winding element 1a is the output end of the power control device PC (the output end of the inverter unit IV). ) Is used as an alternative output terminal of the output terminal of the power control device PC (the output terminal of the inverter unit IV), and the output terminal of the noise reduction coil element 1a. Is connected to the input end of the three-phase induction motor M, and the noise reduction winding element 1a is integrated with the casing main body (housing HS). More specifically, one end Tm11 on the input side of the coil 111 in the coil 11 of the noise reduction winding element 1a is connected to the U-phase output bus bar, and the coil 111 in the coil 11 of the noise reduction winding element 1a. The other end Tm12 on the output side is connected to the U-phase input end of the three-phase induction motor M. One end Tm21 on the input side of the coil 112 in the coil 11 of the noise reduction winding element 1a is connected to the V-phase output bus bar, and the output side of the coil 112 in the coil 11 of the noise reduction winding element 1a. The other end Tm22 is connected to the V-phase input end of the three-phase induction motor M. Then, one end Tm31 on the input side of the coil 113 in the coil 11 of the noise reduction winding element 1a is connected to the W-phase output bus bar, and the output of the coil 113 in the coil 11 of the noise reduction winding element 1a. The other end portion Tm32 on the side is connected to the W-phase input end of the three-phase induction motor M. The noise reduction winding element 1a is integrated with the casing body (housing HS) in any of various aspects similar to the noise reduction winding element 1a described above. Furthermore, it is preferable that the noise reduction winding element 1a is integrated with the casing body at a position where the axis thereof coincides with the axis of the casing body (housing HS). As a result, the noise reduction winding element 1a has the same axis as that of the first and second bus bars.

  In the noise reduction winding elements 1a and 1a as the noise reduction winding elements FT1 and FT2, the coil 11 is a strip-shaped conductor member, and the width direction of the conductor member is along the axial direction of the coil 11. Since it is configured by winding with an insulating material (not shown) interposed therebetween, the conductor member of each turn is composed of a conductor member inside one turn via an insulating material and a conductor member outside one turn via an insulating material. Since the capacitor is formed between the coils 11, the coil 11 itself can be capacitive. In addition, the capacitor | condenser formed in this coil 11 is shown with the code | symbol C11, C12, C31, C32 in FIG. For this reason, such noise reduction winding elements 1a and 1a can independently include an L component and a C component, and an LC filter can be suitably configured alone. Therefore, such a noise reduction winding element 1a, 1a does not require a capacitor separately, and the number of parts can be reduced. And since such housing | casing HS and power control apparatus PC (inverter part IV) use the above-mentioned noise reduction winding element 1a, 1a, the noise which arises by inverter IV can be reduced, and the number of parts can be reduced. Reduction is also possible.

  Next, another embodiment will be described.

(Second Embodiment)
FIG. 16 is a longitudinal sectional view showing a schematic configuration of a noise reduction winding element in the second embodiment. The noise reduction winding element 1b of the second embodiment is further provided with a first magnetic cylindrical member 14 in the noise reduction winding element 1a of the first embodiment. That is, the noise reduction winding element 1b of the second embodiment includes, for example, a coil 11, a magnetic core 12, a magnetic plate member 13, and a first magnetic cylindrical member 14, as shown in FIG. Yes. The coil 11, the magnetic core 12, and the magnetic plate member 13 in the noise reduction winding element 1d of the second embodiment are the same as those of the first embodiment except that the magnetic core 12 further houses the first magnetic cylindrical member 14. Since it is the same as the coil 11, the magnetic core 12, and the magnetic plate member 13 in the noise reduction winding element 1a, description thereof is omitted.

  The first magnetic cylindrical member 14 is disposed on the inner peripheral surface of the coil 11 (the peripheral surface of the core portion) so as to cover the entire inner peripheral surface of the coil 11, and is formed of a second magnetic material such as ferrite, for example. . Therefore, the first magnetic cylindrical member 14 is a cylindrical member having an outer diameter slightly smaller than the inner diameter of the coil 11, and both end portions of the first magnetic cylindrical member 14 in the axial direction are respectively magnetic plate members on the radial inner side. 131 and 132 are arranged close to each end.

  Such a noise reduction winding element 1b of the second embodiment further reduces noise even for a relatively small current by the function of the first magnetic cylindrical member 14 for a relatively small current. Can do.

  Next, another embodiment will be described.

(Third embodiment)
FIG. 17 is a longitudinal sectional view showing a schematic configuration of a noise reduction winding element in the third embodiment. The noise reduction winding element 1c of the third embodiment is further provided with a second magnetic cylindrical member 15 in the noise reduction winding elements 1a and 1b of the first and second embodiments. That is, the noise reduction winding element 1c of the third embodiment includes, for example, a coil 11, a magnetic core 12, a magnetic plate member 13, a first magnetic cylindrical member 14, and a second, as shown in FIG. And a magnetic cylindrical member 15. The coil 11, the magnetic core 12, and the magnetic plate member 13 in the noise reduction winding element 1c of the third embodiment, except that the magnetic core 12 further houses the first and second magnetic cylindrical members 14 and 15, Since it is the same as the coil 11, the magnetic core 12, and the magnetic plate member 13 in the noise reduction winding element 1a of the first embodiment, the description thereof is omitted. Since the first magnetic cylindrical member 14 in the noise reduction winding element 1c of the third embodiment is the same as the first magnetic cylindrical member 14 in the noise reduction winding element 1b of the second embodiment, the description thereof is omitted. Is omitted.

  The second magnetic cylindrical member 15 is disposed on the outer peripheral surface of the coil 11 so as to cover the entire outer peripheral surface of the coil 11, and is formed of a second magnetic material such as ferrite, for example. Therefore, the second magnetic cylindrical member 15 is a cylindrical member having an inner diameter slightly larger than the outer diameter of the coil 11, and both end portions of the second magnetic cylindrical member 15 in the axial direction are respectively magnetic plate members on the radially outer side. 131 and 132 are arranged close to each end.

  Such a noise reduction winding element 1c of the third embodiment further reduces noise even with a relatively small current by the function of the second magnetic cylindrical member 15 with respect to a relatively small current. Can do.

  FIG. 17 shows the noise reduction winding element 1c of the third embodiment further including the second magnetic cylindrical member 15 in the noise reduction winding element 1b of the second embodiment. As described above, the noise reduction winding element of the third embodiment may further include the second magnetic cylindrical member 15 in the noise reduction winding element 1a of the first embodiment shown in FIG.

  Next, another embodiment will be described.

(Fourth embodiment)
The coils 11 in the noise reduction winding elements 1a, 1b, and 1c of the above-described first to third embodiments have a single pancake structure, but the noise reduction windings of the above-described first to third embodiments. In the line elements 1a, 1b, and 1c, a coil 31 having a double pancake structure may be used instead of the coil 11.

  The noise reduction winding element 1 d according to the fourth embodiment including the coil 31 having such a double pancake structure includes the coil 31, the magnetic core 12, and the magnetic plate member 13. The magnetic core 12 and the magnetic plate member 13 in the noise reduction winding element 1d of the fourth embodiment are the noise reduction winding of the first embodiment except that the magnetic core 12 houses the coil 31 instead of the coil 11. Since it is the same as the magnetic core 12 and the magnetic plate member 13 in the line element 1a, the description thereof is omitted.

  The coil 31 is configured by winding a strip-like long conductor member with an insulating material interposed therebetween so that the width direction of the conductor member is along the axial direction of the coil 31 (flatwise winding structure). The coil 31 has a so-called double pancake structure in which a plurality of overlapping strip-shaped conductor members are wound in two layers in the axial direction of the upper coil and the lower coil.

  Such a noise reduction winding element 1d of the fourth embodiment can be manufactured, for example, by the following steps. FIG. 18 is a diagram illustrating a method for manufacturing a noise reduction winding element according to the fourth embodiment.

  First, a strip-shaped conductor member having a predetermined thickness t and having an insulation coating is prepared for the number of subcoils (the number of phases). In the following description, it is assumed that there are three conductor members in order to manufacture the noise reduction winding element 1d corresponding to three phases. Of course, each step can be carried out in the same manner even with any number (one or more) of conductor members.

  Next, these three insulation-coated conductor members are sequentially superposed (sequentially laminated), and as shown in FIG. 18 (A), these three superposed conductor members (superposed conductor member) SB) is wound from both ends thereof, and an intermediate portion thereof is bent by a predetermined angle in a direction (width direction) perpendicular to the longitudinal direction in a plane including the strip-shaped overlapping conductor member SB by plastic molding, for example.

  Next, as shown in FIG. 18B, the bent portion is brought into contact with the outer peripheral surface of the center winding frame CF, and the overlapping conductor member SB has a predetermined number of turns starting from the contact point. As shown in FIG. 18 (C), it is wound around the outer peripheral surface of the center winding frame CF, and double pancake winding (DP winding) is performed using the center winding frame CF as a winding frame.

  Next, when the overlapping conductor member SB is completely wound around the center winding frame CF, as shown in FIG. 18D, the center winding frame CF is extracted, and the first to third coils 311 to 313 are formed. A coil 31 is formed.

  Next, as shown in FIG. 18E, the magnetic plate members 131 and 132 are respectively disposed on both end surfaces of the coil 31 in the axial direction, and the unwrapped portions of the overlapping conductor member SB are the first to third coils. Magnetic plate members 131 and 132 and the coil 31 are accommodated in the magnetic core 12 so as to be taken out as the connection terminals Tm1 to Tm3 of 311 to 313.

  According to such a procedure, the noise reduction winding element 1d of the fourth embodiment in which the magnetic plate members 131 and 132 and the double pancake coil 31 are housed in the bottomed and covered cylindrical magnetic core 12 is manufactured.

  The noise reduction winding element 1d of the fourth embodiment using the coil 31 having such a double pancake structure can easily pull out the winding start end and winding end end of the coil 31 to the outer periphery of the coil 31. Wiring to the coil 31 becomes easy.

  In the above description, the first magnetic cylindrical member 14 and / or the second magnetic cylindrical member 15 may be further provided like the noise reduction winding elements 1b and 1c of the second and third embodiments. That is, in the noise reduction winding element 1b of the second embodiment shown in FIG. 16, the coil 31 may be used instead of the coil 11, and the noise reduction winding element of the third embodiment shown in FIG. In 1c, the coil 31 may be used instead of the coil 11, and the first embodiment includes the magnetic plate member 13 and the second magnetic cylindrical member 15 without including the first magnetic cylindrical member 14 (not shown). In the noise reduction winding element, a coil 31 may be used instead of the coil 11. A and / or B means at least one of A and B.

  In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

1a, 1b, 1c, 1d Noise reduction winding element 11, 31 Coil 12 Magnetic core 13 Magnetic plate member

Claims (7)

A noise reduction winding element for reducing predetermined noise,
A coil configured by winding a strip-shaped conductor member such that the width direction of the conductor member is along the axial direction of the coil;
A magnetic core for passing the magnetic flux generated by the coil and accommodating the coil;
A magnetic plate member disposed so as to cover both end faces of the coil in the axial direction,
The magnetic core is formed of a first magnetic material having a first permeability and a first saturation magnetic flux density,
The magnetic plate member is formed of a second magnetic material having a second magnetic permeability higher than the first magnetic permeability and a second saturation magnetic flux density lower than the first saturation magnetic flux density. Winding element for noise reduction. 2. The noise reduction winding element according to claim 1, further comprising a first magnetic cylindrical member disposed on an inner peripheral surface of the coil and formed of the second magnetic material. The noise reduction winding element according to claim 1, further comprising a second magnetic cylindrical member disposed on an outer peripheral surface of the coil and formed of the second magnetic material. The noise reduction winding element according to any one of claims 1 to 3, wherein the first magnetic material is a dust core material in which iron powder and a resin are mixed. The noise reduction winding element according to any one of claims 1 to 4, wherein the second magnetic material is ferrite. The first magnetic material is a material having the first permeability of 500 or less and the first saturation magnetic flux density of 1T or more,
The said 2nd magnetic material is a material whose said 2nd magnetic permeability is 1000 or more and whose said 2nd saturation magnetic flux density is 0.5T or less, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. 2. A noise reduction winding element according to item 1. The noise reduction winding element according to any one of claims 1 to 6, wherein the coil has a double pancake structure.