JP5940822B2 - Winding element - Google Patents

Description

  The present invention relates to a winding element in which a long conductor is wound, and more particularly, to a winding element that can suppress an increase in vibration accompanying a temperature rise when a core composed of a plurality of members is provided.

  In a winding element wound with a long conductor, energy is transferred between a plurality of windings (coils) by using a reactor (coil) for the purpose of introducing reactance into the circuit or electromagnetic induction. There are known transformers (transformers, transformers) and the like. This reactor is used, for example, in various electric circuits and electronic circuits such as prevention of harmonic currents in power factor correction circuits, smoothing of current pulsations in current type inverter and chopper control, and boosting of DC voltage in converters. Yes. Transformers are used in various electric circuits, electronic circuits, and the like in order to perform voltage conversion, impedance matching, current detection, and the like.

  Such a winding element usually includes a coil and a core through which a magnetic flux generated when the coil is energized. Here, in the case where the core is composed of a plurality of members, a magnetic field is generated when AC power is supplied to the coil, and an attractive electromagnetic force acts between the plurality of members of the core. For this reason, in the winding element, the core vibrates due to the attracting electromagnetic force, and noise is generated. In particular, due to dimensional tolerance (manufacturing tolerance) in each member of the core, there may be a case where the contact surface between the members contacts each other. In such a case, a large vibration is likely to occur. For this reason, in order to reduce the said dimensional tolerance and reduce the said piece contact, the method of performing surface treatments, such as cutting the contact surface of each member, can be considered. However, performing such surface treatment leads to an increase in man-hours and an increase in cost.

  On the other hand, there is a technique disclosed in, for example, Patent Document 1 as a countermeasure against vibration generated in such a reactor. In Patent Document 1, a plurality of magnetic first cores are connected via at least one or more gap plates to form a core unit, and the two core units are arranged to face each other with a predetermined separation. A second core having two magnetisms is disposed in the space to form a substantially circular reactor core in plan view, and the end surface of the second core and the core unit are cut off and cut off An adhesive layer is interposed between the end face of the second core and the core unit, and an adhesive layer is interposed between the gap plate and the first core. An epoxy resin adhesive is used for each adhesive layer (see paragraph [0030] in Patent Document 1). According to Patent Document 1, the reactor having the above-described configuration can obtain the desired inductance while easily absorbing the dimensional tolerance of the member by the respective adhesive layers, and the vibration generated at the time of current application is conventionally obtained. It is described that it can be remarkably reduced as compared with the reactor (see paragraph [0042] of Patent Document 1).

JP 2008-263062 A

  By the way, in general, when the coil element is energized, the coil generates heat and the temperature rises (temperature rises). In Patent Document 1, since each adhesive layer is a resin, the Young's modulus may decrease with this temperature increase. As a result, the rigidity of the entire winding element may be reduced, and vibration may increase.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a winding element having a core composed of a plurality of members and capable of suppressing an increase in vibration caused by temperature rise. It is to provide an element.

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 winding element according to one aspect of the present invention is a winding element including a coil and a core through which a magnetic flux generated by the coil passes, and the coil winds a long conductor member. The core is composed of a plurality of members, a first resin layer is interposed between the plurality of members, and the first resin layer has a loss factor when the temperature is higher than room temperature. The second resin layer is formed of a resin material larger than the loss coefficient at room temperature, and when the Young's modulus is E [GPa] and the loss coefficient is tan δ, the loss coefficient tan δ is E ≧ 0. .2 region, the boundary line tan δ = 0.0706 × E ^0.8934 or more, and in the region 0.2>E> 0.04, the boundary line tan δ = 0.017 or more, and 0.04 ≧ E In the region, the boundary line tan δ = 0.0009 × E ^{− The} resin material is ^0.9097 or more .

  In the winding element having such a configuration, since the first resin layer is interposed between the plurality of members in the core, the dimensional tolerance of each member can be absorbed by the first resin layer. In the winding element configured as described above, the first resin layer has a loss factor (loss factor) representing the degree of vibration damping, as compared with the value when the temperature is high (room temperature, 20 ° C.). Therefore, even if the Young's modulus decreases as the winding element temperature rises, the loss factor increases, so that an increase in vibration associated with the temperature rise can be suppressed.

  In addition, the Patent Document 1 only describes that an epoxy resin adhesive is used as an adhesive layer in the paragraph [0030], and there is no description about the loss factor, and there is no suggestion thereof.

In the winding element having such a configuration, since the loss coefficient tan δ is optimized according to the Young's modulus E, it is possible to suitably suppress an increase in vibration accompanying a temperature increase.

According to another aspect, in the above-described winding element, the core includes first and second core members fastened and fixed to each other by a fastening member, and the first resin layer includes the first core member and the first core member. The first and second core members are disposed between the second core member, and the first and second core members protrude from the outer periphery of the disc portion in the axial direction of the disc portion. A cylindrical member provided, and a fastening member through-hole formed in a substantially center of the disc portion along the axial direction of the disc portion so that the fastening member can be inserted therethrough, And the end faces of the cylindrical portion of the second core member are overlapped so as to form a space for accommodating the coil therein, and the first resin layer is formed of the cylindrical portion of the first and second core members. It arrange | positions between end surfaces, It is characterized by the above-mentioned.

  In another aspect, in the above-described winding element, the core is formed so as to accommodate the coil, is disposed in a core portion of the coil, and a second resin layer is interposed on the inner upper surface of the core. And a spacer member that is in contact with the inner lower surface of the core via a third resin layer, and the second and third resin layers each have a loss coefficient at a temperature higher than normal temperature of the normal temperature. It is characterized by being formed of a resin material larger than the loss coefficient in the case.

  In the winding element having such a configuration, since the second and third resin layers are interposed between the inner upper and lower surfaces of the core and the spacer member, the dimensional tolerances of the core and the spacer member are set to the second. And can be absorbed by the third resin layer. In the winding element configured as described above, the second and third resin layers each have a high-temperature loss coefficient larger than that at room temperature, so that the Young's modulus decreases as the winding element rises in temperature. However, since the loss factor increases, it is possible to suppress an increase in vibration accompanying the temperature rise.

In another aspect, in the above-described winding element, preferably, the second resin layer has a loss coefficient tan δ when the Young's modulus is E [GPa] and the loss coefficient is tan δ. In the region of E ≧ 0.2, the boundary line tan δ = 0.0706 × E ^0.8934 or more, and in the region of 0.2>E> 0.04, the boundary line tan δ = 0.017 or more, 0.04 In the region of ≧ E, the boundary line tan δ = 0.0009 × E ^−0.9097 or more is formed.

  Since the winding element having such a configuration optimizes the loss coefficient tan δ according to the Young's modulus E, it is possible to suitably suppress an increase in vibration accompanying a temperature rise.

In another aspect, in the above-described winding element, preferably, the third resin layer has a loss coefficient tan δ when the Young's modulus is E [GPa] and the loss coefficient is tan δ. In the region where E ≧ 0.2, the boundary line tan δ = 0.0706 × E ^0.8934 or more, and in the region where 0.2>E> 0.04, the boundary line tan δ = 0.017 or more. In the region of 04 ≧ E, the boundary line tan δ = 0.0009 × E ^−0.9097 or more is formed of a resin material.

  Since the winding element having such a configuration optimizes the loss coefficient tan δ according to the Young's modulus E, it is possible to suitably suppress an increase in vibration accompanying a temperature rise.

  The winding element according to the present invention is a winding element having a core composed of a plurality of members, and can suppress an increase in vibration accompanying a temperature rise.

It is a perspective view which shows the external appearance of the coil | winding element in embodiment. It is sectional drawing which shows the structure of the coil | winding element in embodiment. It is a perspective view showing each composition of a coil and a core in a winding element of an embodiment. It is a figure which shows the relationship between the Young's modulus and loss factor of resin by simulation. It is a figure which shows the analysis model used when simulating the loss coefficient of a resin layer. It is a figure for demonstrating the deformation | transformation mode of a coil | winding element. It is a figure which shows the temperature dependence of the resin material which forms each resin layer. It is a figure which shows the analysis model used when simulating the coil | winding element provided with the resin layer formed with the resin material of the actual example 1 and the comparative example 1. FIG.

  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.

(Embodiment)
FIG. 1 is a perspective view showing an appearance of a winding element in the embodiment. FIG. 2 is a cross-sectional view showing the configuration of the winding element in the embodiment. FIG. 3 is a perspective view showing each configuration of a coil and a core in the winding element of the embodiment. FIG. 3A shows the coil, and FIG. 3B shows the core.

  For example, as shown in FIGS. 1 and 2, the winding element D in the embodiment includes one coil 1 and a core 2, and in the present embodiment, a pair of first and second terminal portions. 3 (3-1, 3-2), a fastening member 4, a spacer member 5, a first resin layer 6, a second resin layer 7-1, and a third resin layer 7-2, for example, It functions as a reactor. The winding element D may be a multi-phase reactor having a plurality of coils, or may be a transformer having a plurality of coils. Thus, the coil 1 of the winding element may be one or more.

  The coil 1 is obtained by winding a long conductor member a predetermined number of times in an insulated state, and generates a magnetic field when energized. The coil 1 may be configured by winding a long conductor member with an insulating coating such as a round cross section (◯ shape) or a rectangular cross section (□ shape), but in this embodiment, a so-called eddy current is used. From the viewpoint of reducing the loss, as shown in FIG. 3 (A), the coil 1 is in an insulated state by sandwiching a strip-like conductor member, for example, with an insulation coating or an insulation sheet, and the width direction of the conductor member is 1 is a flat-wise coil having a so-called flat-wise winding structure.

  In addition, strip | belt shape means the case where the width | variety (length in an axial direction) Cw is larger than the thickness (diameter direction length) Ct of a conductor member, ie, between width Cw and thickness Ct. , Cw> Ct (Cw / Ct> 1).

  At both ends of the coil 1, a pair of first and second terminal portions (lead wiring, lead wiring, electrode wire) 3 (3-1, 3-2) are provided. The first and second terminal portions 3-1 and 3-2 are terminals for electrically connecting an external circuit and the coil 1 (the conductor member). These first and second terminal portions 3-1 and 3-2 may be formed by attaching a conductor wire to both ends of the conductor member, for example, by welding or soldering. For example, in the present embodiment, the first and second terminal portions 3-1 and 3-2 are connected to the coil 1 (the conductive member) in order to prevent peeling due to heat and to ensure higher reliability. By bending the end portion, the portion is drawn in a direction intersecting a plane orthogonal to the axial direction of the coil 1 (see, for example, JP 2011-205056 A). And these 1st and 2nd terminal parts 3-1 and 3-2 are made into the multiplex structure by bend | folding with the fold line along the axial direction from a viewpoint of reducing an electrical resistance while reducing a size. For example, the first and second terminal portions 3-1 and 3-2 have a four-layer structure.

  The core 2 is a member that allows magnetic flux generated by the magnetic field generated in the coil 1 to pass through when the coil 1 is energized, and is magnetically (for example, magnetic permeability) isotropic. The core 2 is composed of a plurality of core members. For example, as shown in FIGS. 1, 2, and 3 (B), the core 2 is inserted into the first and second terminal portions 3-1 and 3-2. The first and second core members 21 and 22 having the same configuration are provided except that the first and second terminal portion through holes communicating with each other are provided in one core member. The first and second core members 21 and 22 are, for example, cylindrical portions 212 having outer peripheral surfaces having the same diameter as the disk portions 211 and 221 on the plate surfaces of the disk portions 211 and 221 having a disk shape, for example. 222 is continuous. In the example shown in FIG. 1, a direction along the direction in which the first and second terminal portions 3-1 and 3-2 are pulled out from the coil 1 (in the present embodiment, the disc portion 211 of the first core member 21 is First and second terminal portion through holes (not shown in FIG. 3B) are formed so as to penetrate the disk portion 211 in the axial direction of the coil 1. The first and second fastening member through-holes 214 for inserting the fastening members 4 are inserted into the approximate centers (centers) of the disk portions 211 and 221 of the first and second core members 21 and 22, respectively. 224 are formed penetrating along the axial direction.

  The core 2 is formed by overlapping the first and second core members 21 and 22 having such a configuration with the end surfaces of the cylindrical portions 212 and 222 through the first resin layer 6. A space for accommodating the coil 1 is formed in the core 2, and the first and second fastening member through holes 214 and 224 communicate with each other, so that one surface of the core 2 moves from the other surface to the other surface. A through hole for a fastening member for inserting the fastening member 4 is formed.

  Such first and second core members 21 and 22 have predetermined magnetic characteristics. The first and second core members 21 and 22 are preferably made of the same material from the viewpoint of cost reduction. The first and second core members 21 and 22 may be surface-insulated pure iron, but in this embodiment, for example, desired magnetic characteristics (relatively high magnetic permeability) can be easily realized and desired. From the viewpoint of ease of forming the shape, it is preferable that the soft magnetic powder is formed. The first and second core members 21 and 22 may be laminated steel plates as long as they can be manufactured.

  This 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, Furthermore, the iron powder etc. with which electric insulation films, such as a phosphoric acid system chemical film, were formed on the surface are mentioned. These soft magnetic powders can be produced by, for example, the atomizing method. In general, since the saturation magnetic flux density is large when the magnetic permeability is the same, the soft magnetic powder is preferably a metal material such as the above pure iron powder, iron-based alloy powder, and amorphous powder. Such first and second core members 21 and 22 can be formed, for example, by compacting soft magnetic powder using known conventional means.

  In the present embodiment, the first and second core members 21 and 22 are provided with convex portions 215 and 225 for positioning on the respective end surfaces of the cylindrical portions 212 and 222 that are overlapped with each other. Concave portions 216 and 226 corresponding to the convex portions 215 and 225 are provided. Note that the convex portions 215 and 225 and the concave portions 216 and 226 may be omitted. For example, as shown in FIG. 3B, substantially cylindrical first and second convex portions 215-1 and 215 are formed on the end surfaces of the cylindrical portions 212 and 222 of the first and second core members 21 and 22, respectively. -2; 225-1 and 225-2 are provided at intervals of 180 ° (positions facing each other), and the first and second convex portions 215-1 and 215-2; The first and second recesses 216-1 and 216-2 and 226 and 226-2 having substantially cylindrical shapes into which 225-2 are fitted are provided at intervals of 180 ° (positions facing each other). . And these 1st and 2nd convex parts 215-1 and 215-2; 225-1,225-2 and 1st and 2nd recessed parts 216-1, 216-2; , Provided at intervals of 90 °. FIG. 3B shows one of the first and second core members 21 and 22 (the first and second terminal portion through holes are not shown). By providing the positioning convex portions 215 and 225 on the end surfaces of the cylindrical portions 212 and 222, the first and second core members 21 and 22 can be more reliably abutted.

  Moreover, in this embodiment, as shown in FIG. 2 and FIG. 3 (B), when the coil 1 is accommodated in the core 2, the air core is disposed at a location facing the air core portion S of the coil 1 in the core 2. First and second protrusions 213 and 223 that enter the portion S are formed. More specifically, when the coil 1 is housed in the core 2, a truncated cone shape that enters the air core portion S at a location facing the air core portion S of the coil 1 on the inner bottom surface of the first core member 21. The first protrusion 213 is formed, and when the coil 1 is accommodated in the core 2, the air core portion S is formed at a position facing the air core portion S of the coil 1 on the inner bottom surface of the second core member 22. A second truncated cone-shaped projection 223 is formed. By forming such first and second protrusions 213 and 223, the inductance of the winding element D can be further improved. In addition, the inductance value of the winding element D can be adjusted by adjusting the gap length between the protrusions 213 and 223. Further, the first and second protrusions 213 and 223 can have any shape in order to control the inductance characteristics, and are not limited to the truncated cone shape. Also good.

  And in this embodiment, the coil | winding element D is arrange | positioned in the axial center part of the coil 1, and arrange | positions the 2nd resin layer 7-1 on the inner upper surface of the core 2 facing one end part in the axial center of the coil 1. And a spacer member 5 that abuts on the inner lower surface of the core 2 facing the other end of the axial center of the coil 1 via the third resin layer 7-2. In the example shown in FIG. 2, since the first and second protrusions 213 and 223 are formed on the inner upper and lower surfaces of the core 2 as described above, one end surface of the spacer member 5 is the end surface of the first protrusion 213. The other end surface is in contact with the end surface of the second protrusion 223 through the third resin layer 7-2. As described above, the winding element D of the present embodiment includes the spacer member 5 between the surfaces (the gap) of the first and second protrusions 213 and 223 facing each other. The spacer member 5 has a ring shape (ring shape, donut shape) having a diameter (diameter) smaller than the inner diameter (inner diameter) of the coil 1. Such a spacer member 5 is, for example, a molded body such as a resin such as an epoxy resin, a ceramic such as alumina, and a metal such as stainless steel. The resin preferably has a relatively high rigidity. As described above, the winding element D according to the present embodiment includes the spacer member 5 between the surfaces of the first and second projecting portions 213 and 223 facing each other (the gap). The vibration of both parts of the core 2 facing both ends of the part can be suppressed.

  The plurality of fastening members 4 are members for fixing the first and second core members 21 and 22 to each other in the present embodiment, and are, for example, bolts and nuts, rivets, clips, or the like.

  In the manufacture of such a winding element D, the first and second terminal portions 3-1 and 3-2 are pulled out from the first and second terminal portion through-holes to the internal space of the core 2. The coil 1 is disposed on the first core member 21 (or the second core member 22) so as to be accommodated, and the second and third resins are provided between the surfaces of the first and second protrusions 213 and 223 (the gap). The first and second core members 21 and 22 are abutted with each other with the first resin layer 6 interposed so that the spacer member 5 is disposed with the layers 7-1 and 7-2 interposed therebetween. Then, the fastening member 4 is inserted into the through hole for fastening member, and the first and second core members 21 and 22 are fixed by the fastening member. For example, the bolt of the fastening member 4 is inserted into the through hole for fastening member, and the first and second core members 21 and 22 are fastened and fixed to each other by the bolt and the nut of the fastening member 4. Thus, the winding element D of this embodiment is a so-called pod type element in which the coil 1 is built in the core 2.

  In the above description, the first and second core members 21 and 22 are fastened and fixed by the fastening member 4, but the first to third resin layers 6, 7-1 and 7-2 are formed of an adhesive. Accordingly, the first and second core members 21 and 22 may be bonded and fixed by the first to third resin layers 6, 7-1, and 7-2 of the adhesive. Alternatively, the first and second core members 21 and 22 may be fastened and fixed by the fastening member 4 and may be bonded and fixed by the first to third resin layers 6, 7-1, and 7-2 of the adhesive. .

  Thus, in the winding element D of the present embodiment, the first resin layer 6 is interposed between the plurality of members in the core 2 and between the contact surfaces of the first and second core members 21 and 22 in the above description. Therefore, the first resin layer 6 can absorb the dimensional tolerances of the first and second core members 21 and 22 in each member.

  Further, since the winding element D of the present embodiment has the second and third resin layers 7-1 and 7-2 interposed between the inner upper and lower surfaces of the core 2 and the spacer member 5, respectively. Each dimensional tolerance of the core 2 and the spacer member 5 can be absorbed by the second and third resin layers 7-1 and 7-2.

  The winding element D of the present embodiment has the following first to third resin layers 6 and 7-1 in order to suppress an increase in vibration caused by the temperature rise that occurs when the coil 1 is energized as follows. 7-2 are optimized.

That is, the first to third resin layers 6, 7-1 and 7-2 are each formed of a resin material in which the loss coefficient tan δ _h at a high temperature higher than normal temperature is larger than the loss coefficient tan δ _c at the normal temperature. Is done. The adjustment of the loss factor tan δ can be realized by a known conventional means, for example, by mixing an inorganic filler with a resin material. In addition, it is preferable that the resin material has a high rigidity at room temperature higher than a rigidity that realizes a vibration satisfying a predetermined specification that is defined in advance at room temperature, for example, from the viewpoint of further reducing vibration.

  Here, the high temperature is higher than normal temperature (room temperature, 20 ° C.) and below a temperature at which electrical soundness can be guaranteed, for example, between adjacent conductor members wound around the coil 1 or between the coil 1 and the core 2. For example, a temperature range higher than normal temperature and 160 ° C. or lower, a temperature range higher than normal temperature and 150 ° C. or lower, and the like.

  FIG. 4 is a diagram showing the relationship between the Young's modulus of the resin and the loss coefficient by simulation. In FIG. 4, the horizontal axis is a logarithmic scale and is a double logarithmic graph, the horizontal axis is the Young's modulus E expressed in GPa, and the vertical axis is the loss coefficient tan δ. FIG. 5 is a diagram showing an analysis model used when simulating the loss coefficient of the resin layer. FIG. 6 is a diagram for explaining a deformation mode of the winding element.

Since the winding element D is used in a relatively wide frequency band, it is necessary that the vibration is suppressed even when the winding element D resonates (resonance state). When the loss coefficients at room temperature Tc and high temperature Th are tan δ _c and tan δ _h , respectively, the change in the vibration level (amplitude) accompanying the temperature rise in the resonance state is the change amount of the resonance magnification (resonance peak response magnification) Δ It represents with following Formula (1) using Q.
ΔQ = 20 × log (tan δ _c / tan δ _h ) (1)
Here, log is a common logarithm with base 10 and ΔQ is expressed in dB.

  If the change amount ΔQ of the resonance magnification is reduced by 3 dB or more (a value of −3 dB or less (ΔQ ≦ −3 dB)), the vibration energy becomes 1/2 or less, and vibration is significantly suppressed. From this point of view, the relationship between the Young's modulus and the loss coefficient of the resin forming the first to third resin layers 6, 7-1, 7-2 of the winding element D is expressed by a numerical experiment using a finite element method ( Simulation and analysis). FIG. 4 shows the result.

  In FIG. 1 is a result of Sample No. 2 and Δ indicates the sample No. The result of 3. These sample Nos. 1-No. The specifications of 3 are as shown in Table 1 when the dimensions of each part of the winding element D are LA to LG as shown in FIG. That is, LA is the radius (pole radius) of each projection 214, 224 in the first and second core members 21, 22 (in the example shown in FIG. 5, each projection 214, 224 has a cylindrical shape). , LB is the length (coil thickness) along the radial direction of the space in which the coil 1 is accommodated, and LC is the thickness (yoke thickness) of each cylindrical portion 212, 222 in the first and second core members 21, 22. LD is the thickness (top plate thickness) of each of the disk portions 211 and 221 in the first and second core members 21 and 22, and LE is each of the first and second core members 21 and 22. The height of the cylindrical portions 212 and 222 (coil height / 2), LF is the height of each projection 214 and 224 (projection height) in the first and second core members 21 and 22, and , LG are the protrusions facing each other. The distance between each side of the parts 214, 224 (gap length). In the winding element D having various specifications shown in Table 1, the thicknesses of the first and second resin layers 7-1 and 7-2 are each 0.2 mm, and the total is 0.4 mm.

  Note that x min is the minimum value of the loss factor of the resin required for vibration reduction of 3 dB when E ≧ 0.2, and min2 of * is a loss when 0.2> E> 0.04 The minimum value of the coefficient, min3 of ◯ is the minimum value of the loss coefficient when 0.04 ≧ E, and the power of the solid line (min) is the result of exponential approximation of min of x by the least square method The solid line power (min2) is the result of exponential approximation of im of the above * by the least square method.

  From FIG. 4, when the Young's modulus E of the resin forming each resin layer 6, 7-1, 7-2 is relatively large, the rigidity of the entire winding element D is high, and it is necessary to increase the loss factor of the resin. There is. If the Young's modulus E of the resin becomes too small, the influence of the resin layers 6, 7-1 and 7-2 on the distortion of the entire winding element D becomes small, and it is necessary to increase the loss factor of the resin. is there. On the other hand, when the Young's modulus E of the resin is between these, the influence of the resin layers 6, 7-1, 7-2 on the distortion of the entire winding element D is large, and the loss factor of the resin is small. Good. 2 and 5, in the deformation mode shown in FIG. 6A, the resin layers 6, 7-1, and 7-2 are strained by the entire winding element D. On the other hand, the separation at the contact surfaces of the first and second core members 21 and 22 is large and has the greatest influence. Further, each of the resin layers 6, 7-1, 7-2 greatly affects the distortion of the entire winding element D even for shear deformation as shown in FIG.

As shown in FIG. 4, based on the result of this simulation, the first resin layer 6 has a loss coefficient tan δ of E ≧ 0. 0 when its Young's modulus is E [GPa] and its loss coefficient is tan δ. In the region of 2, the boundary line tan δ = 0.0706 × E ^0.8934 or more, and in the region of 0.2>E> 0.04, the boundary line tan δ = ^0.177 or more, and the region of 0.04 ≧ E Then, it is preferable to form with the resin material which is more than boundary line tan- ^delta = 0.0009 * E- ^0.9097 . The second resin layer 7-1 has a boundary line tan δ = 0.0706 × E ^0.8934 or more in a region where the loss coefficient tan δ is E ≧ 0.2, and 0.2>E> 0.04. In the region, the boundary line tan δ is ^{equal to} or greater than 0.017, and in the region of 0.04 ≧ E, the boundary line tan δ is preferably ^{equal to} or greater than 0.0009 × E ^−0.9097 . The third resin layer 7-2 has a boundary line tan δ = 0.0706 × E ^0.8934 or more in a region where the loss coefficient tan δ is E ≧ 0.2, and 0.2>E> 0.04. In the region, the boundary line tan δ is ^{equal to} or greater than 0.017, and in the region of 0.04 ≧ E, the boundary line tan δ is preferably ^{equal to} or greater than 0.0009 × E ^−0.9097 .

  In the above description, the first to third resin layers 6, 7-1, and 7-2 are formed using the same material, but may be formed using different materials. The portions may be formed using different materials (the remainder is formed using the same material).

(Examples and Comparative Examples)
FIG. 7 is a diagram showing the temperature dependence of the resin material forming each resin layer. The horizontal axis in FIG. 7 is the temperature expressed in ° C., the vertical axis on the right side of the paper is the loss coefficient tan δ, and the vertical axis on the left side of the paper is the Young's modulus (storage elastic modulus) E expressed in GPa. ● is the Young's modulus E, and ■ is the loss factor tan δ. FIG. 8 is a diagram illustrating an analysis model used when simulating a winding element including a resin layer formed of the resin material of the actual example 1 and the comparative example 1. FIG. 8A is a cross-sectional view of the winding element for explaining the analysis model, and FIG. 8B is a cross-sectional perspective view of the winding element showing the state of each element in the finite element method used for the analysis. FIG.

  And the vibration reduction amount accompanying the temperature rise in the case where the first to third resin layers 6, 7-1, 7-2 are formed of the resin material of Example 1, and the first to third of the resin material of Comparative Example 1 are used. It verified about the vibration reduction amount accompanying the temperature rise in the case of forming 3 resin layers 6, 7-1, 7-2.

  The resin material of Example 1 is an epoxy adhesive 1 having a glass transition temperature of 144 ° C. and a calcium inorganic compound mixed as an inorganic filler.

  The resin material of Comparative Example 1 is an epoxy adhesive 2 having a conventional glass transition temperature of 170 ° C.

  The temperature characteristics of Young's modulus E and loss coefficient tan δ in the resin materials of Example 1 and Comparative Example 1 are as shown in FIG. 7A shows the temperature characteristics of Example 1 in the temperature range of 20 ° C. to 150 ° C., and FIG. 7B shows the temperature characteristics of Comparative Example 1 in the temperature range of 20 ° C. to 160 ° C. Temperature characteristics are shown. As shown in FIG. 7, the Young's modulus E of each of the resin materials of Example 1 and Comparative Example 1 is gradually reduced as the temperature rises. Since the resin material of Example 1 has a glass transition temperature of 144 ° C., the Young's modulus E slightly decreases with increasing temperature in this vicinity. On the other hand, in the resin material of Comparative Example 1, the loss coefficient tan δ slightly decreases gradually, although there is a slight increase and decrease with the temperature increase from 20 ° C. In contrast, in the resin material of Example 1, the loss factor tan δ gradually decreases as the temperature rises in the range from room temperature 20 ° C. to about 70 ° C., and the temperature rises above about 70 ° C. It increases with.

The amount of change ΔQ in the resonance magnification in the winding element D using the resin material of Example 1 and Comparative Example 1 for each of the resin layers 6, 7-1, 7-2 In the case of the resin material of Example 1, the amount of change in the resonance magnification at 20 ° C. _{ΔQ 2,20} = 0 dB, and the amount of change in the resonance magnification at 150 ° C. _{ΔQ 2,150} = about 0 dB. in the case of a resin material of example 1, the amount of change in the resonance magnification of 20 ° C. is △ _Q 1, 20 = 0 dB, the change in the resonance magnification of 150 ℃ △ _{Q 1,150} = about -4.3dB met It was. Thus, by using the resin material of Example 1, when the temperature was raised from 20 ° C. to 150 ° C., an effect of reducing the resonance magnification of −4.3 dB was confirmed.

  In this simulation, the winding element D having the structure shown in FIG. 8A is used, and each specification is LA = 24.5 mm, LB = 12.3 mm, and LC = 7.2 mm. LD = 11.5 mm, LE = 10.5 mm, LF = 9.9 mm, LG = 0.8 mm (the thickness of the spacer member 5), and the second and third resins The thicknesses of the layers 7-1 and 7-2 are each 0.2 mm, and the total is 0.4 mm.

  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.

D Winding element 1 Coil 2 Core 5 Spacer member 6 First resin layer 7-1 Second resin layer 7-2 Third resin layer

Claims (5)

A winding element comprising a coil and a core through which a magnetic flux generated by the coil passes;
The coil is configured by winding a long conductor member,
The core is composed of a plurality of members, and a first resin layer is interposed between the plurality of members,
The first resin layer is formed of a resin material having a loss factor at a higher temperature than room temperature that is greater than the loss coefficient at the room temperature ,
When the Young's modulus is E [GPa] and the loss coefficient is tan δ, the first resin layer has a boundary line tan δ = 0.0706 × E ⁰ when the loss coefficient tan δ is E ≧ 0.2. ^In the region where 0.2>E> 0.04, the boundary line tan δ = ^0.177 or more, and in the region where 0.04 ≧ E, the boundary line tan δ = 0.0009 × E ^−0.9097. A winding element characterized by being formed of the resin material as described above . The core includes first and second core members fastened and fixed to each other by a fastening member,
Each of the first and second core members is inserted through a disc portion having a disc shape, a cylindrical portion projecting in an axial direction of the disc portion from an outer periphery of the disc portion, and the fastening member. A fastening member through hole formed so as to penetrate along the axial direction of the disk part at the approximate center of the disk part,
End surfaces of the cylindrical portions of the first and second core members are overlapped to form a space for accommodating the coil therein,
The winding element according to claim 1, wherein the first resin layer is disposed between end surfaces of cylindrical portions of the first and second core members . The core is formed to receive the coil;
A spacer member disposed in the core of the coil, and abutting against the inner upper surface of the core via a second resin layer and further contacting the inner lower surface of the core via a third resin layer;
The second and third resin layers are each formed of a resin material having a loss factor at a temperature higher than room temperature higher than that at the room temperature. The winding element described in 1. The second resin layer has a boundary line tan δ = 0.0706 × E ^{0 in} a region where the loss coefficient tan δ is E ≧ 0.2 when the Young's modulus is E [GPa] and the loss coefficient is tan δ. ^In the region where 0.2>E> 0.04, the boundary line tan δ = ^0.177 or more, and in the region where 0.04 ≧ E, the boundary line tan δ = 0.0009 × E ^−0.9097. The winding element according to claim 3, wherein the winding element is formed of the resin material as described above. The third resin layer has a boundary line tan δ = 0.0706 × E ^{0 in} a region where the loss coefficient tan δ is E ≧ 0.2 when the Young's modulus is E [GPa] and the loss coefficient is tan δ. ^In the region where 0.2>E> 0.04, the boundary line tan δ = ^0.177 or more, and in the region where 0.04 ≧ E, the boundary line tan δ = 0.0009 × E ^−0.9097. It forms with the resin material which is the above. The winding element of Claim 3 or Claim 4 characterized by the above-mentioned.