WO2012032715A1 - Winding element - Google Patents

Abstract

A winding element (Da) of the present invention is disposed on the outside of a coil (1) and is formed by a plurality of members (21a, 22a), and the contact surfaces of the plurality of members (21a, 22a) are provided with a core part (2a) that is oblique or perpendicular to the axial direction of the coil (1). As a result, in the winding element (Da) having this kind of construction, the contact surfaces of the plurality of members (21a, 22a) abut against each other, and therefore the plurality of members (21a, 22a) are firmly brought into contact with each other, resulting vibration can be suppressed, and noise can be reduced.

Description

Winding element

The present invention relates to a winding element in which a long conductor is wound, and more particularly, to a winding element having a core portion through which a magnetic flux passes.

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. In such a reactor or transformer, in order to circulate the magnetic flux generated in the coil, the reactor is provided with a core portion through which the magnetic flux passes. In the transformer, one coil (primary coil) is eliminated without leakage of the magnetic flux to the outside. ) To the other coil (secondary coil), a core portion (iron core, yoke) through which magnetic flux passes is provided.

In such a winding element, a gap may be formed in the core portion in order to adjust the inductance. This gap is assumed to sandwich an air gap or a gap material made of a nonmagnetic material. In such a winding element, when a coil is excited, an electromagnetic force acts on the core portion, which causes vibration. In particular, vibration occurs in the gap.

Therefore, for example, there is a reactor disclosed in Patent Document 1 as a reactor with this vibration countermeasure. FIG. 19 is a diagram illustrating a configuration of a reactor disclosed in Patent Document 1. FIG. 19A is an external configuration diagram, FIG. 19B is a longitudinal sectional view, and FIG. 19C is an exploded perspective view. The reactor 1000 disclosed in Patent Document 1 includes a core portion 1010 and a coil 1020 in FIG. 19, and the core portion 1010 includes a columnar inner core 1011, a hollow cylindrical outer core 1012, and the like. And a pair of upper and lower disk-shaped connecting cores 1013 (1013U, 1013L), and the coil 1020 includes a winding 1021. The winding 1021 is wound around the inner core 1011 and is fitted inside the outer core 1012. A pair of upper and lower connecting cores 1013U and 1013L are joined to the upper and lower surfaces of the inner core 1011 and the outer core 1012, respectively. Both ends of the winding 1021 are drawn out from a notch 1121 formed in the outer core 1012. The core portion 1010 is substantially composed of a material having a relative magnetic permeability of 5-50. The reactor having such a configuration is a so-called pot-type reactor having a gapless core portion 1010 with no gaps. By making the core portion 1010 gapless, the vibration problem is solved and the core portion 1010 is made transparent. A desired inductance is obtained by using a material having a magnetic permeability of 5 to 50.

By the way, in the reactor disclosed in Patent Document 1, the vibration problem is solved by making the core portion gapless, but the coil 1020 is an air-core coil excluding the inner core 1011 (in order to adjust its inductance). When the convex portion extending into the axial core portion of the air-core coil may be on the inner surface of the connecting cores 1013U and 1013L), when AC power is supplied to the air-core coil, it is generated by the coil. The electromagnetic force fluctuates at the frequency, and the connecting cores 1013U and 1013L vibrate.

Japanese Patent Laid-Open No. 2008-112935

The present invention has been made in view of the above circumstances, and its object is to reduce vibration in a winding element including an air-core coil and a core portion disposed outside the air-core coil. It is providing the coil | winding element which can reduce a noise.

The winding element according to the present invention is arranged on the outside of the coil and is constituted by a plurality of members, and the contact surfaces of the plurality of members are oblique or orthogonal to the axial direction of the coils. Department. For this reason, in the winding element having such a configuration, the abutting surfaces of the plurality of members abut against each other so that the plurality of members are firmly abutted to suppress vibrations and reduce noise. can do.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

It is sectional drawing which shows the structure of the coil | winding element in 1st Embodiment. It is sectional drawing which shows the other structure of the contact surface in the coil | winding element of 1st Embodiment. It is a figure for demonstrating the resonance mode excited by the coil | winding element provided with an air core coil and the air core core part arrange | positioned on the outer side of this air core coil. It is a longitudinal cross-sectional view which shows the structure of the winding element of the comparative example whose contact surface between the some members in a core part is parallel with respect to the axial direction of a coil. It is a longitudinal cross-sectional view which shows the structure of the coil | winding element in 2nd Embodiment. It is a perspective view which shows the structure of the 1st core member (2nd core member) in the core part of the coil | winding element of 2nd and 3rd embodiment. It is a longitudinal cross-sectional view which shows the structure of the coil | winding element in 4th Embodiment. It is a longitudinal cross-sectional view which shows the structure of the coil | winding element in 5th Embodiment. In the winding element of 5th Embodiment, it is a figure (the 1) for demonstrating the case where a fastening member is combined with a fixing member. In the winding element of 5th Embodiment, it is a figure (the 2) for demonstrating the case where a fastening member is combined with a fixing member. In the coil | winding element of 5th Embodiment, it is a figure for demonstrating the case where a fastening member is combined with a connection member. It is a figure which shows the structure of the coil | winding element in 6th Embodiment. It is a figure which shows the change of the vibration acceleration with respect to the change of the drive frequency in a 1st Example and a comparative example. It is a figure for demonstrating the difference in the natural frequency by the difference in the outline shape of a core part. It is a figure for demonstrating the difference in the natural frequency by the presence or absence of a connection member, and a difference. It is a figure for demonstrating the difference in the natural frequency by the presence or absence of a gap filling material. It is a figure which shows the change of the vibration acceleration with respect to the change of temperature by the presence or absence of a fastening member. FIG. 9 is a diagram showing a vibration distribution in the winding element having the structure shown in FIG. It is a figure which shows the structure of the reactor disclosed by patent document 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.

The winding element according to the present embodiment is a winding element including one or a plurality of coils and a core portion through which a magnetic flux generated by the coils passes, and the coil winds a long conductor member. The core portion is arranged on the outer side of the coil and is constituted by a plurality of members, and the contact surfaces of the plurality of members are oblique or orthogonal to the axial direction of the coils. It is what you are doing. Such a winding element functions as, for example, a reactor when configured with one coil, and functions as, for example, a transformer when configured with a plurality of coils.

Here, a winding element that functions as a reactor is illustrated, but a winding element that functions as a transformer can be similarly configured.

(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a winding element in the first embodiment. FIG. 2 is a cross-sectional view showing another configuration of the contact surface in the winding element of the first embodiment.

In FIG. 1, the winding element Da according to the first embodiment is configured to include one coil 1 and a core portion 2 a through which a magnetic flux generated by the coil 1 passes when the coil 1 is energized. It functions.

The coil 1 is obtained by winding a long conductor member with insulation coating a predetermined number of times, and generates a magnetic field when energized. For example, the coil 1 may be configured by winding a long conductor member having an insulating coating such as a round cross section (◯ shape) or a rectangular cross section (□ shape). The strip-shaped conductor member coated with insulation is wound so that the width direction of the conductor member is along the axis AX direction of the coil 1. The band shape refers to a case where the width (axial length) W is larger than the thickness (diameter length) t of the conductor member, that is, between the width W and the thickness t, W > T (W / t> 1) is established. Thus, the coil 1 of this embodiment has a so-called flat-wise winding structure.

The core portion 2a is a member that allows a magnetic flux generated by the magnetic field generated in the coil 1 to pass when the coil 1 is energized. The core part 2 a is disposed outside the coil 1. More specifically, in this embodiment, the core part 2a is a so-called pot type including the coil 1 as shown in FIG. The core portion 2a is formed with an opening such as a through hole for drawing out a terminal for electrical connection with the coil 1 and a through hole for injecting a gap filling material to be described later into the core portion 2a. The core portion 2 a shown in FIG. 1 substantially includes the coil 1.

And the core part 2a is comprised by the some member. In the example shown in FIG. 1, the core part 2a is comprised by the two 1st and 2nd core members 21a and 22a. The first and second core members 21a and 22a have the same shape from the viewpoint of improving productivity. The first and second core members 21a and 22a are substantially perpendicular to the disc-shaped disc portions 211a and 221a covering one end of the coil 1 and the peripheral portion of one main surface of the disc portions 211a and 221a. And cylindrical portions 212a and 222a extending in the direction. In other words, the first and second core members 21a and 22a are formed on the cylindrical portions 212a and 222a surrounding the outer periphery of the coil 1 so as to cover approximately half of the side surfaces in the axial direction of the coil 1, and on the end surfaces of the cylindrical portions 212a and 222a. The disk-shaped disk parts 211a and 221a connected are comprised. The core 1a is formed by enclosing the coil 1 in a cylindrical internal space and bringing the end faces of the cylindrical portions 212a and 222a of the first and second core members 21a and 22a into contact with each other. As shown in FIG. 1, the longitudinal section including the axis of the core portion 2a has a square shape. The contact surfaces 2sf of the first and second core members 21a and 22a, which are formed by bringing the end surfaces of the cylindrical portions 212a and 222a of the first and second core members 21a and 22a into contact with each other, It is oblique or orthogonal to the axis AX direction of the coil 1. In the example shown in FIG. 1, the contact surface 2 sfa is orthogonal to the axis AX direction of the coil 1. In addition, in the case of being orthogonal to each other, the contact surface 2sf is formed so that the shape of the contact surface 2sfa in the longitudinal section orthogonal to the contact surface 2sfa is from one end to the other end as shown in FIG. In addition to the contact surface 2sfa having a “−” shape (single line shape), the contact surface 2sfb may have a step shape as shown in FIG. In the case of the skew, the shape of the contact surface 2sf in the longitudinal section perpendicular to the skew direction of the contact surface 2sf is a “/” shape (an oblique one) from one end to the other end. Main line shape), but also folded shapes such as "V" shape and "W" shape (having a plurality of different skew directions, and two of the plurality of skew directions intersect each other. Shape), “-” shape and “/ Or a combination of the shape. The coil 1 has DC power or AC power, for example, AC power having a bias that is not alternating in polarity (power in which the AC voltage is superimposed on a DC voltage having a voltage value equal to or greater than the voltage amplitude of the AC voltage; pulsating power) ) Is generated, a magnetic field is generated by the coil 1, and an attractive magnetic force along the axis AX direction is generated in the axial core portion of the coil 1 by this magnetic field. Although this attractive magnetic force acts on the contact surface 2sf, since the core member is in contact, vibration due to the attractive magnetic force can be suppressed.

Such a core portion 2a (first and second core members 21a and 22a) is made of a material having predetermined magnetic characteristics. For example, the core portion 2a is made of a material that is magnetically isotropic and has a relative permeability corresponding to the inductance required for the winding element Da. The core portion 2a may be manufactured, for example, by press molding using a known conventional means. From the viewpoint of easy realization of desired magnetic characteristics and ease of molding of a desired shape, for example, soft magnetic powder It is preferable to mold a mixture of the nonmagnetic powder and the nonmagnetic powder. The mixing ratio ratio between the soft magnetic powder and the non-magnetic powder can be adjusted relatively easily, and by appropriately adjusting the mixing ratio, the magnetic characteristics of the core portion 2a can be easily adjusted to the desired magnetic characteristics. It can be realized. Moreover, since it is a mixture of soft magnetic powder and non-magnetic powder, it can be formed into various shapes, and the shape of the core portion 2a can be easily formed into a desired shape.

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, for example, by a method of making fine particles by an atomizing method or the like, or 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.

Such a core portion 2a is formed by mixing iron powder as soft magnetic powder and resin as nonmagnetic powder, for example, by using known conventional means, for example, a predetermined powder molded For example, this member has a density of 7000 kg / m ³ and a Young's modulus of 85 GPa.

In the winding element Da having such a configuration, the core portion 2a is composed of a plurality of members, in the above-described example, two first and second core members 21a and 22a, and these first and second core members 21a. 22a, the attractive magnetic force generated by the coil 1 acts on the contact surface 2sf. The contact surfaces 2 sf of the first and second core members 21 a and 22 a are oblique or orthogonal to the axial direction of the coil 1. Here, the magnetic force generated by the coil 1 is mainly generated along the axial direction of the coil 1. Therefore, with respect to the magnetic force generated along the axial direction of the coil 1, the contact surface 2 sf of the first and second core members 21 a and 22 a is oblique or orthogonal to the axis AX direction of the coil 1. Therefore, when the contact surfaces of the first and second core members 21a and 22a abut against each other, the vibration can be suppressed and noise can be reduced. For this reason, the contact surfaces 2sf of the first and second core members 21a and 22a may be oblique to the axis AX direction of the coil 1, but it is more effective to be orthogonal as described above. And preferred.

FIG. 3 is a diagram for explaining a resonance mode excited by a winding element including an air-core coil and an air-core core portion arranged outside the air-core coil. FIG. 3A shows a state of the resonance state of the core part in the primary resonance mode, and FIG. 3B shows a state of the resonance state of the core part in the secondary resonance mode. FIG. 4 is a longitudinal sectional view showing a configuration of a winding element of a comparative example in which contact surfaces between a plurality of members in the core portion are parallel to the axial direction of the coil.

More specifically, in a winding element including an air-core coil and an air-core core portion disposed outside the air-core coil, as shown in FIG. Only the mode in which the vibration displacement in each part of the core portion to be performed is plane symmetric appears as the resonance mode. For this reason, as shown in FIG. 4, in the winding element of the comparative example in which the contact surfaces between the plurality of members in the core part are parallel to the axial direction of the coil, the axial attractive force by the coil is the core part. If it acts on, the contact surface parallel to the axial direction of the coil cannot resist the attractive magnetic force in the axial direction. On the other hand, in the winding element Da of the present embodiment, as described above, the contact surfaces between the plurality of members in the core portion 2a are oblique or orthogonal to the axial direction of the coil 1, so that the axial direction It is possible to resist the attractive magnetic force, and to suppress the vibration and reduce the noise.

Next, another embodiment will be described.

(Second Embodiment)
FIG. 5 is a longitudinal sectional view showing the configuration of the winding element in the second embodiment. The winding element Dc of the second embodiment is provided with a convex portion extending into the axial core portion of the air-core coil 1 in order to adjust the inductance in the winding elements Da and Db of the first embodiment. For this reason, since the coil 1 is the same as the winding elements Da and Db of the first embodiment, the description thereof is omitted.

The winding element Dc of the second embodiment can be configured as a modification of the winding element Db according to another aspect of the first embodiment, but here, the modification of the winding element Da of the first embodiment is used. The case where it comprises as a form is demonstrated below.

The core portion 3 in the winding element Dc of the second embodiment is a member through which the magnetic flux generated by the magnetic field generated in the coil 1 passes when the coil 1 is energized, like the core portion 2a in the winding element Da of the first embodiment. In this case, it is a so-called pot type disposed outside the coil 1, and is constituted by a plurality of members, in the example shown in FIG. The first and second core members 31 and 32 have the same shape as the first and second core members 21a and 22a of the first embodiment, and are disk-shaped circles that cover one end of the coil 1. The plate portions 311 and 321 and the cylindrical portions 312 and 322 extending substantially perpendicularly from the peripheral portion of one main surface of the disk portions 311 and 321 are configured. The coil 1 is included in a cylindrical internal space, and the first and second core members 31 and 32 are formed by bringing the end faces of the cylindrical portions 312 and 322 into contact with each other. The contact surfaces 3 sf of the second core members 31 and 32 are oblique or orthogonal to the axis AX direction of the coil 1. Here, the magnetic force generated by the coil 1 is mainly generated along the axial direction of the coil 1, and this attractive magnetic force acts on the contact surface 3sf. Therefore, with respect to the magnetic force generated along the axial direction of the coil 1, the contact surfaces 2 sf of the first and second core members 31 and 32 are obliquely or orthogonal to the axis AX direction of the coil 1. Therefore, when the contact surfaces of the first and second core members 31 and 32 abut against each other, the vibration can be suppressed and noise can be reduced.

And in the core part 3 of 2nd Embodiment, the convex part extended in the axial center inside of the coil 1 is provided in each inner surface in the said disk parts 311 and 321 facing the axial center part of the coil 1 along the axis AX direction. Portions 313 and 323 are formed, respectively. In the example shown in FIG. 5, the convex portions 313 and 323 have a truncated cone shape having a tapered surface whose side surface is inclined with respect to the axis AX direction.

In the winding element Dc having such a configuration, the gap length between the upper part and the lower part of the core part 3 inside the axial center of the coil 1 can be adjusted by the convex parts 313 and 323, and the inductance of the winding element Dc can be adjusted. It becomes possible to adjust.

Next, another embodiment will be described.

(Third embodiment)
FIG. 6 is a perspective view showing the structure of the first core member (second core member) in the core portion of the winding element of the second and third embodiments. FIG. 6A shows a first core member (second core member) in the third embodiment, and FIG. 6B shows a first core member (second core member) in the second embodiment.

In the winding elements Da, Db, and Dc of the first and second embodiments, the outline shape of the core portions 2 and 3 is a similar cylindrical shape in accordance with the cylindrical inner space. In the winding element Dd of the form, the contour shape of the coil 1 is a cylindrical shape, the core portion 4 has a cylindrical space for containing the coil 1, and the contour shape of the core portion 4 is It is a polygonal column shape. For this reason, the coil 1 is the same as the winding elements Da, Db, and Dc of the first and second embodiments, and the description thereof is omitted.

The winding element Dd of the third embodiment can be configured as a modification of the winding elements Da and Db of the first embodiment, but here, it is configured as a modification of the winding element Dc of the second embodiment. This case will be described below.

The core part 4 in the winding element Dd of the third embodiment is a member through which the magnetic flux generated by the magnetic field generated in the coil 1 passes when the coil 1 is energized, like the core part 3 in the winding element Dc of the second embodiment. It is a so-called pot type disposed outside the coil 1, and further includes a plurality of members, in the example shown in FIG. 6 (A), two first and second core members 41 and 42. ing. These first and second core members 41, 42 have the same shape, and have outline (outer shape) rectangular plate portions 411, 421 covering one end of the coil 1, and one main surface of the plate portions 411, 421. The cylindrical portions 412 and 422 having a substantially rectangular outer shape and an inner circular shape extending substantially perpendicularly from the peripheral edge portion of FIG. The coil 1 is enclosed in a cylindrical internal space formed by the cylindrical portions 412, 422, and the end surfaces of the cylindrical portions 412, 422 of the first and second core members 41, 42 are in contact with each other. The contact surfaces 4sf (not shown) of the first and second core members 41 and 42 formed by the crossing are oblique or orthogonal to the axis AX direction of the coil 1. Here, the magnetic force generated by the coil 1 is mainly generated along the axial direction of the coil 1, and this attractive magnetic force acts on the contact surface 4sf. Therefore, with respect to the magnetic force generated along the axial direction of the coil 1, the contact surfaces 4 sf of the first and second core members 41 and 42 are oblique or orthogonal to the axis AX direction of the coil 1. Therefore, when the contact surfaces of the first and second core members 41 and 42 abut against each other, the vibration can be suppressed and noise can be reduced. And the core part 4 of 3rd Embodiment is the said disk part facing the axial center part of the coil 1 along the axis | shaft AX direction in order to adjust the inductance similarly to the core part 3 of 2nd Embodiment. Convex portions 413 and 423 are provided on the inner surfaces of 411 and 421 and extend into the axial core of the formed coil 1. In the example shown in FIG. 6A, these convex portions 413 and 423 have a truncated cone shape with side surfaces inclined with respect to the axis AX direction.

And in the core part 4 in the coil | winding element Dd of 3rd Embodiment, the space for enclosing the coil 1 formed by contact | abutting the 1st and 2nd core members 41 and 42 mutually is cylindrical shape. The contour shape (outer shape) is, for example, a triangular prism shape, a quadrangular prism shape, a polygonal prism shape such as a pentagonal prism shape and a hexagonal prism shape, and in the example shown in FIG.

In the winding element Dd having such a configuration, the core portion 4 is formed by bringing the first and second core members 31 and 32 of the second embodiment shown in FIG. 6B into contact with each other. 3, compared with the case where the contour shape of the core portion is a columnar shape, the corner portion of the side wall portion of the core portion 4 facing the outer periphery of the coil 1 has a thicker portion. For this reason, the winding element Dd having such a configuration can improve the rigidity of the core portion 4 and shift its natural frequency to the high frequency side as compared with the case where the contour shape of the core portion is a cylindrical shape. it can. That is, the vibration of the core part 4 can be suppressed.

Even if the contour shape of the core portion is different, the electromagnetic characteristics of the winding element D are substantially equal if the thickness of the thinnest portion of the side wall portion of the core portion is the same.

In addition, in the winding element Dd of the third embodiment, a fixing for fixing the winding element Dd to an attachment member (not shown) to which the winding element Dd is attached is provided at the corner portion of the core portion 4. An engaging portion for engaging the member may be further provided. In the example shown in FIG. 6A, through holes 414 (424) for inserting bolts as fixing members are provided at the respective corner portions of the first and second core members 41 and 42 of the core portion 4, respectively. ing.

Next, another embodiment will be described.

(Fourth embodiment)
FIG. 7 is a longitudinal sectional view showing the configuration of the winding element in the fourth embodiment. FIG. 7A shows the configuration of the first aspect of the winding element of the fourth embodiment, and FIG. 7B shows the configuration of the second aspect of the winding element of the fourth embodiment.

The winding element De of the fourth embodiment is arranged at least inside the axis of the coil 1 in the winding elements Da, Db, Dc, Dd of the first to third embodiments, and at the axis of the coil 1 It further includes a connecting member for connecting at least both inner surface portions of the core portion facing both end portions. For this reason, the coil 1 is the same as the winding elements Da, Db, and Dc of the first and second embodiments, and the description thereof is omitted.

The winding element De of the fourth embodiment can be configured as a modification of the winding elements Da, Db, Dc of the first and second embodiments, but here, the winding element Dd of the third embodiment is used. The case where it comprises as a modification of this is demonstrated below.

The core part 3 in the winding element De of the fourth embodiment is the same as the core part 3 in the winding element Dd of the third embodiment, as shown in FIGS. 7 (A) and 7 (B). And the winding element De1 concerning the 1st aspect of 4th Embodiment is arrange | positioned in a part inside the axial center of the coil 1, as shown to FIG. 7 (A), and both ends in the axial center of the coil 1 It further includes a connecting member 33 for connecting a part of both inner surface portions of the core portion 3 facing each other. More specifically, the connecting member 33 has, for example, a solid cylindrical shape having a diameter (diameter) smaller than the inner diameter (inner diameter) of the coil 1, and both end surfaces of the connecting member 33 are first and second. The core members 31 and 32 are in contact with the respective surfaces of the convex portions 313 and 323 extending from the disk portions 311 and 321 into the axial portion of the coil 1. Such a connecting member 33 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. Such a connecting member 33 may have a ring shape (ring shape, donut shape), as will be described later. Alternatively, the winding element De2 according to the second aspect of the fourth embodiment is formed by contacting the first and second core members 31 and 32 with each other as shown in FIG. 7B. And a connecting member 34 that is filled in a space excluding the coil 1. The connecting member 34 is formed, for example, by injecting a resin such as epoxy resin into the space of the core portion 3 from a through hole (not shown) formed in the core portion 3 and then curing the resin. Alternatively, before the first and second core members 31 and 32 are brought into contact with each other, the connecting member 34 pours resin into a portion of the first and second core members 31 and 32 that becomes the space after the contact. The first and second core members 31 and 32 may be brought into contact with each other after curing. The resin preferably has a relatively high rigidity. By forming the connecting member 34 in this way, the connecting member 34 is disposed in the entire axial center of the coil 1 and at both inner surface portions of the core portion 3 facing both ends of the axial core of the coil 1. It becomes a member that connects everything.

Since the winding elements De1 and De2 having such a configuration further include the connecting members 33 and 34, vibrations of both portions of the core portion 3 facing both ends of the axial center of the coil 1 can be suppressed. The rigidity of the core portion 3 is further improved, and the natural frequency can be shifted to the high frequency side as compared with the case where the connecting members 33 and 34 are not provided. That is, the vibration of the core part 4 can be suppressed.

A winding element including an air-core coil and an air-core core portion arranged outside the air-core coil has a resonance mode as described with reference to FIG. In order to shift the natural frequency to the high frequency side, it is preferable that the connecting member 33 abuts at a position at about ½ of the diameter of the core portion 3, and the connecting member 33 is ½ or more of the diameter of the core portion 3. It is preferable to have a diameter of

Note that such a connecting member 33 may also serve as a winding core of the coil 1 when the coil 1 is manufactured.

Next, another embodiment will be described.

(Fifth embodiment)
FIG. 8 is a longitudinal sectional view showing the configuration of the winding element in the fifth embodiment. FIG. 8A shows the configuration of the first aspect of the winding element of the fifth embodiment, and FIG. 8B shows the configuration of the second aspect of the winding element of the fifth embodiment. FIG. 9 is a view (No. 1) for explaining a case where a fastening member is also used as a fixing member in the winding element of the fifth embodiment. FIG. 9A shows a first variation in the case where the fastening member is also used as a fixing member in the winding element of the first aspect shown in FIG. 8A, and FIG. In the winding element of the second mode shown in (B), a second modification mode in the case where the fastening member is also used as a fixing member is shown, and FIG. 9 (C) shows the second mode shown in FIG. 8 (B). A winding element WHEREIN: The 3rd deformation | transformation aspect in case a fastening member is combined with a fixing member is shown. FIG. 10 is a diagram (No. 2) for explaining the case where the fastening member is also used as the fixing member in the winding element of the fifth embodiment. FIG. 10A shows a fourth modification in the case where the fastening member is also used as a fixing member in the winding element of the first aspect shown in FIG. 8A, and FIG. In the winding element of the second mode shown in (B), a fifth modification mode in the case where the fastening member is also used as a fixing member is shown, and FIG. 10 (C) shows the second mode shown in FIG. 8 (B). The winding element WHEREIN: The 6th deformation | transformation aspect in case a fastening member is combined with a fixing member is shown. FIG. 11 is a diagram for explaining a case where the fastening member is also used as the connecting member in the winding element of the fifth embodiment.

The fifth embodiment includes a plurality of members constituting the contact surfaces 2sfa, 2sfb, 3sf, and 4sf in the winding elements Da, Db, Dc, Dd, and de of the first to fourth embodiments. The first and second core members 21a, 22a; 21b, 22b; 31, 32; 41, 42 are further provided with fastening members. For this reason, the coil 1 is the same as the winding elements Da, Db, and Dc of the first and second embodiments, and the description thereof is omitted.

The winding element Df of the fifth embodiment can be configured as a modified form of the winding elements Da, Db, Dc, Dd, De of the first to fourth embodiments, but here, the winding element Df of the third embodiment The case where it constitutes as a modification of winding element Dd is explained below.

The core portions 4a and 4b in the winding elements Df1 and Df2 of the fifth embodiment are caused by the magnetic field generated in the coil 1 when the coil 1 is energized, like the core portion 4 in the winding element Dc of the third embodiment. A member that allows magnetic flux to pass, which is a so-called pot type disposed outside the coil 1, and in the example shown in FIG. 8 (A) and FIG. 8 (B), two first and It is comprised by 2nd core member 41a, 42a; 41b, 42b. These first and second core members 41a, 42a; 41b, 42b have the same shape as the first and second core members 41, 42 of the third embodiment, and contours that cover one end of the coil 1 (Outer shape) Quadrangular plate portions 411a, 421a; 411b, 421b and one of the plate portions 411a, 421a; And cylindrical portions 412a, 422a; 412b, 422b having a circular shape. The coil 1 is encapsulated in a cylindrical inner space formed by cylindrical portions 412a, 422a; 412b, 422b, and the cylindrical portions 412a of the first and second core members 41a, 42a; 41b, 42b, The contact surfaces 4sf1 and 4sf2 of the first and second core members 41a and 42a; 41b and 42b are formed in the direction of the axis AX of the coil 1 and are formed by bringing the end surfaces of the surfaces 422a and 412b and 422b into contact with each other. It is diagonally or orthogonal to it. Here, the magnetic force generated by the coil 1 is mainly generated along the axial direction of the coil 1, and this attractive magnetic force acts on the contact surfaces 4sf1 and 4sf2. Therefore, against the magnetic force generated along the axial direction of the coil 1, the contact surfaces 4 sf 1 and 4 sf 2 of the first and second core members 41 a and 42 a; 41 b and 42 b are in the axial AX direction of the coil 1. Since they are obliquely or orthogonally crossed, the contact surfaces of the first and second core members 41a, 42a; 41b, 42b abut against each other, so that vibration can be suppressed and noise can be reduced. And the core parts 4a and 4b of 5th Embodiment are the said circles which oppose the axial center part of the coil 1 along the axis | shaft AX direction in order to adjust the inductance similarly to the core part 4 of 3rd Embodiment. On the inner surfaces of the plate portions 411a, 421a; 411b, 421b, convex portions 413a, 423a; 413b, 423b extending to the inside of the axial core of the coil 1 are provided. These convex portions 413a, 423a; 413b, 423b are in the shape of a truncated cone having a tapered surface whose side surface is inclined with respect to the axis AX direction in the example shown in FIGS. 8A and 8B. Further, the winding elements Df1 and Df2 of the fifth embodiment are arranged at least inside the axial core of the coil 1 and at both end portions of the axial core of the coil 1 similarly to the winding element De of the fourth embodiment. Further provided are connecting members 43a and 43b for connecting at least both inner surface portions of the facing core portions 4a and 4b.

And the fastening member 71a formed along the axis AX direction on the first and second core members 41a, 42a; 41b, 42b of the core portions 4a, 4b in the winding elements Df1, Df2 of the fifth embodiment. , 71b are inserted through holes 415a, 425a; 415b, 425b. These through holes 415a, 425a; 415b, 425b are formed at the center positions (axial positions) of the first and second core members 41a, 42a; 41b, 42b of the core portions 4a, 4b. Furthermore, in the winding element Df2 of the second mode, not only the through holes 415b and 425b are provided at the center positions of the first and second core members 41b and 42b of the core portion 4b, but also the first and second of the core portion 4b. The fastening members 72 (72-1 to 72-4, 72-2 and 72-4 are not shown) formed along the axis AX direction are also inserted through the peripheral portions of the two core members 41b and 42b. Through holes 414b (414b-1 to 414b-4, 424b-1 to 424b-4, 414b-2 and 414b-4 and 424b-2 and 424b-4 are not shown) are provided. The fastening members 71a, 71b, 72 (72-1 to 72-4) are, for example, bolts and nuts. In the winding elements Df1, Df2 having such a configuration, the first and second core members 41a, 42a; 41b, 42b are brought into contact with each other, and the fastening members 71a, 71b are inserted into the through holes 415a, 425a; 415b, 425b. The first and second core members 41a, 42a; 41b, 42b are fastened to each other with the bolts and nuts. Further, in the winding element Df2 of the second aspect, the bolts of the fastening members 72-1 to 72-4 are respectively inserted into the through holes 414b-1 to 424b-4, and the bolts and nuts are used to The first and second core members 41b and 42b are fastened together.

In addition, in the winding elements Df1 and Df2 of the fifth embodiment, the connecting members 43a and 43b are arranged so as to pass through the fastening members 71a and 71b as shown in FIGS. 8A and 8B. It has a shape. Further, the fastening member 71 may be, for example, a rivet or a clip in addition to the bolt and nut described above. The same applies to the fixing member described later.

The winding elements Df1 and Df2 having such a configuration further include the fastening members 71a; 71b and 72, thereby improving the adhesion of the contact surfaces 4sf1 and 4sf2 and further suppressing vibration.

In the winding elements Df1 and Df2 in the fifth embodiment described above, the fastening members 71a; 71b and 72 (72-1 to 72-4) are the same as those shown in FIGS. As shown in (C), the winding elements Df1, Df2, and Df2 are attached to the members to be attached 100 (100a, 100b), 200 (200a, 200b), and 300 (300a, 300b). , Df2 and Df2 may be combined with a fixing member. The attached members 100, 200, 300 are formed with recesses 101, 201, 301 for fixing fastening members (fixing members) 71a; 71b, 72 (72-1 to 72-4). More specifically, in order to screw with a male screw formed at one end of a bolt applied to the fastening member (fixing member) 71a; 71b, 72 (72-1 to 72-4), the recesses 101, 201, An internal thread is formed on the inner peripheral side surface of 301. The attached members 100, 200, and 300 are, for example, a substrate, a casing, a cooling member, and the like.

In the winding elements Df1, Df2, Df2 having such a configuration, the first and second core members 41a, 42a; 41b, 42b; 41b, 42b are brought into contact with each other, and the through holes 415a, 425a; 414b, 424b; The bolts of the fastening members 71a; 71b, 72; 71b, 72 are inserted into 414b, 424b, and further, through the washers 102a, 202a (202a-1 to 202a-4), 302a (302a-1 to 302a-5). Then, the winding elements Df1, Df2, and Df2 are fixedly attached to the attached members 100, 200, and 300 by screwing them into the recesses 101, 201, and 301 for attaching the attached members 100, 200, and 300. In these first to third modifications, instead of the washers 102a, 202a, 302a, step portions (projections, step portions) 102b having a height corresponding to the thickness of the washers 102a, 202a, 302a, 202b (202b-1 to 202b-4) and 302b (302b-1 to 302b-5) may be formed on the attached members 100, 200, and 300. In other words, the stepped portions 102b, 202b (202b-1 to 202b-4) and 302b (302b-1 to 302b-5) corresponding to the washers 102a, 202a and 302a are provided on the surfaces of the mounted members 100, 200 and 300. The other parts except for may be slightly recessed. 9A to 9C show the case where the stepped portions 102b, 202b (202b-1 to 202b-4) and 302b (302b-1 to 302b-5) are formed. Further, in the configurations shown in FIGS. 9A to 9C, the steps 102b, 202b, and 302b are provided on the attached members 100b, 200b, and 300b, but the steps 102b, 202b, and 302b are provided on the steps 102b, 202b, and 302b. Corresponding convex portions may be provided in the core portion. For example, instead of the washers 102a, 202a, and 302a as in the winding elements Df1 ′, Df2 ′, and Df2 ″ shown in FIGS. 10A, 10B, and 10C, the core portion 4a On the surfaces of the second core members 42a ', 42b', 42b "of '4b', 4b", convex portions 44a, 44b (44b-1 to 44b-1 to 44b-1 to 42b "having heights corresponding to the thicknesses of the washers 102a, 202a, 302a. 44b-5) and 44b (44b-1 to 44b-4) may be formed (in other words, the second core members 42a ′, 42b ′, 42b of the core portions 4a ′, 4b ′, 4b ″). ”, The portions other than the portions 44a, 44b (44b-1 to 44b-5) and 44b (44b-1 to 44b-4) corresponding to the washers 102a, 202a, and 302a are slightly recessed. Good The shape of the projections 44a, 44b (44b-1 to 44b-5) and 44b (44b-1 to 44b-4) in plan view may be any shape such as a circle or a polygon, for example. In the fourth modification mode shown in FIG. 10A, the center position is fixed at one place. In the fifth modification mode shown in FIG. 10B, the center position is fixed at one place and the peripheral portion 4 positions, and FIG. In the sixth modification shown in Fig. 8C, the winding is fixed at four peripheral portions, and the winding element having a circular core whose cross section perpendicular to the axial direction is circular is also shown in Figs. And as shown to FIG. 10 (A), it is preferable to fix in a center position.

The winding elements Df1, Df2, Df2, Df1 ′, Df2 ′, and Df2 ″ having such a configuration need to be provided separately because the fastening members 71a, 71b, and 72 are also used as a fixing member. Further, it is possible to reduce the cost, and the stepped portions 102b and 202b (202b-1 to 202b-4), 302b (302b-1 to 302b-5) or the convex portions 44a and 44b can be reduced. By providing (44b-1 to 44b-5) and 44b (44b-1 to 44b-4), the washers 102a, 202a and 302a are not required, and the core portions 4a, 4b, 4a ′, 4b ′, 4b ″ and The thermal conductivity between the mounted members 100, 200, and 300 is improved, and the number of assembly steps is reduced. Further, these step portions 102b, 202b (202b-1 to 202b-4), 302b (302b-1 to 302b-5) or the convex portions 44a, 44b (44b-1 to 44b-5), 44b (44b-1) Even if .about.44b-4) is provided, since the shape change in the core portion 4 is slight, the natural frequency of the winding element Df hardly changes and does not significantly decrease.

In the winding elements Df1, Df2, Df2, Df1 ′, Df2 ′, Df2 ″ having the above-described configuration, the washers 102a, 202a, 302a are used (or the step portions 102b, 202b, 302b, or The mounting positions of the winding elements Df1, Df2, Df2, Df1, Df1 ′, Df2 ′, Df2 ″ attached to the members to be attached 100, 200, 300 (with the convex portions 44a, 44b) are the core portions 4a, 4b, 4a ′, 4b. The position where the vibration displacement at '4b "is relatively small is preferable. This suppresses the vibration of the winding elements Df1, Df2, Df2, Df1', Df2 ', Df2" propagating to the mounted members 100, 200, 300. The Further, the winding elements Df1, Df2, Df2, Df1 ′, Df2 ′, Df2 ″ are lifted from the attachment members 100, 200, 300 by the thicknesses of the washers 102a, 202a, 302a ( steps 102b, 202b). , 302b and the convex portions 44a and 44b), the vibration of the core portions 4a, 4b, 4a ′, 4b ′, and 4b ″ can be further suppressed from propagating to the attached members 100, 200, and 300, and further effects are achieved. In particular, the vibration of the winding elements Df1, Df2, Df2, Df1 ′, Df2 ′, Df2 ″ propagating to the mounted members 100, 200, 300 is suppressed. From this viewpoint, the winding element Df2 of the second mode is suppressed. Is attached to the attached member 200, as shown in FIG. 9B, at the position of the attached member 200 facing the fastening member 71b, The through-hole 203 may be formed, or, as shown in FIG. 9 (C), the winding element Df2 of the second mode is attached to the attached member 300, and the attached member 200 is opposed to the fastening member 71b. A convex portion 202b-5 may be formed at a position where the diameter d (see FIG. 9C) of the convex portion extending into the axial core portion of the air-core coil 1 is compared with the diameter of the core portion 4b. If it is relatively large, the vibration at the center position of the core portion 4b may be reduced. In such a case, the embodiment shown in FIG. 9C in which the center position and the peripheral position are fixed is advantageous. .

In the above description, the fastening members 71a, 71b, and 72 are also used as the fixing members. However, the fastening members 71a and 71b are disposed at least inside the shaft core of the coil 1 and are arranged in the shaft core of the coil 1. It may also be used as a connecting member for connecting at least both inner surface portions of the core portion facing both end portions. More specifically, the fastening member 71c also used as such a connecting member has male threads for attaching nuts to both ends of a cylindrical rod as shown in FIG. A cylindrical portion that functions as a connecting member is formed near the center.

In the winding element Df3 having such a configuration, the first and second core members 41a and 42a are brought into contact with each other through the through holes 415a and 425a from both sides of the fastening member 71c that is also used as a connecting member. Further, nuts are screwed onto both ends of the fastening member 71c and tightened, and the first and second core members 41a and 42a are fastened.

Next, another embodiment will be described.

(Sixth embodiment)
FIG. 12 is a diagram illustrating a configuration of a winding element in the sixth embodiment. FIG. 12A is a longitudinal section, and FIG. 12B is a top view (bottom view).

The winding elements Da, Db, Dc, Dd, De, and Df in the first to fifth embodiments are so-called pot types that substantially include the coil 1, but the winding element Dg in the sixth embodiment is A part of the coil 1 is exposed outside the core portion 5. For this reason, the coil 1 is the same as the winding elements Da, Db, Dc, Dd, De, and Df of the first to fifth embodiments, and the description thereof is omitted.

The core portion 5 in the winding element Dg of the sixth embodiment is a member that allows a magnetic flux generated by the magnetic field generated in the coil 1 to pass when the coil 1 is energized, and is disposed outside the coil 1, and further includes a plurality of members. In the example shown in FIG. 12, the first and second core members 51 and 52 are configured. The first and second core members 51 and 52 have the same shape and are rectangular plate portions 511 and 521 each having a rectangular plate shape that covers a part of one end portion of the coil 1, and one of the rectangular plate portions 511 and 521. Each side wall portion 512-1, 512-2; 522-1 and 522-2 each extending substantially perpendicularly from a pair of side portions facing each other on the main surface. Each of the rectangular plate portions 511 and 521 has a length on one side larger than the outer diameter (outer diameter) of the coil 1, and a length on the other side smaller than the outer diameter of the coil 1. The core portion 5 is formed by bringing the end faces of the side wall portions 512-1, 512-2; 522-1, 522-2 of the first and second core members 51, 52 into contact with each other, and a longitudinal section thereof. Is a square shape as shown in FIG. The coil 1 is disposed in the square-shaped core portion 5 so that the axis connecting the intersections of the diagonal lines of the rectangular plate-shaped portions 511 and 512 and the axis of the coil 1 coincide with each other. The contact surfaces 5 sf of the first and second core members 51 and 52 are oblique or orthogonal to the axis AX direction of the coil 1. Here, the magnetic force generated by the coil 1 is mainly generated along the axial direction of the coil 1, and this attractive magnetic force acts on the contact surface 5sf. Therefore, with respect to the magnetic force generated along the axial direction of the coil 1, the contact surfaces 5 sf of the first and second core members 51 and 52 are oblique or orthogonal to the axis AX direction of the coil 1. Therefore, when the contact surfaces of the first and second core members 51 and 52 abut against each other, the vibration can be suppressed and noise can be reduced.

As described above, the winding element Dg of the sixth embodiment has a structure in which the coil 1 can be seen from the outside, and the core portion portions (in the example shown in FIG. 12, the rectangular plate portions 511, 521) and a core portion (the side wall portions 512 and 522 in the example shown in FIG. 12) that connects these core portions on the outer peripheral surface of the coil 1.

Note that the inner surfaces of the side wall portions 512 and 522 of the core portion 5 in the winding element Dg of the sixth embodiment may be formed along the outer periphery of the coil 1.

Even with such a configuration, the winding element Dg of the sixth embodiment is similar to the winding element Da of the first embodiment in that the contact surface 5sf of the first and second core members 51, 52 is the coil 1 Since the first and second core members 51 and 52 are in contact with each other, the first and second core members 51 and 52 are firmly in contact with each other. The vibration can be suppressed and noise can be reduced.

In the winding elements Da, Db, Dc, Dd, De, Df, Dg in the first to sixth embodiments described above, at least of the contact surfaces and the connection surfaces of the core portion and the connection member On one side, a gap filling material for filling the gap may be further provided. The winding elements Da, Db, Dc, Dd, De, Df, and Dg in the first to fifth embodiments described above, for example, have a very small vibration displacement on the order of nanometers, and a plurality of core members are in contact with each other. Although it suppresses by mutually abutting on a surface, if the adhesiveness of the said contact surface is not favorable by the unevenness | corrugation, processing tolerance, etc. in the surface of a core member, it will become difficult to suppress the said vibration displacement favorably. For this reason, the winding elements Da, Db, Dc, Dd, De, Df, and Dg having such a configuration further include a gap filling material on the contact surface, thereby improving the adhesion of the contact surface and causing vibration. It becomes possible to suppress more. Since the gap filling material is to increase the adhesion of the contact surface in order to suppress the vibration displacement of the nanometer order, it may be a foil-like thin member, preferably a member that is easily familiar with the unevenness of the contact surface, For example, resin foil (thin plate), metal foil (thin plate), paper, or the like can be used. The resin does not need to have adhesiveness, but may have adhesiveness. Thus, since adhesiveness is not necessary, it is also possible to disassemble and inspect the winding elements Da, Db, Dc, Dd, De, Df, and Dg even after use.

In the case of further including such a gap filling material, such fastening members 71a; 71b, 72 (72-1 to 72-4) are provided as in the winding elements Df1, Df2 of the fifth embodiment described above. Further, by applying pressure to the gap filling material by the fastening members 71a; 71b, 72, deterioration of rigidity of the gap filling material at high temperatures is suppressed, and the vibration suppressing effect against temperature change is stable. Become.

In the winding elements Da, Db, Dc, Dd, De, Df, and Dg in the first to sixth embodiments described above, the case where the core portion is formed by the two first and second core members will be described. However, the core portion may be formed by any number of core members. For example, the core portion is formed by three first to third core members, the second core member is a cylindrical member that covers the outer peripheral surface of the coil 1, and the first and third core members have the same shape. And it is a disk-shaped member respectively connected with the both ends in the cylindrical shape of the said 2nd core member.

Next, examples will be described.

(Example)
FIG. 13 is a diagram illustrating a change in vibration acceleration with respect to a change in drive frequency in the first example and the comparative example. The horizontal axis in FIG. 13 is the drive frequency (kHz), and the vertical axis is the vibration acceleration. ○ indicates the result of the first example, and ● indicates the result of the comparative example.

The winding element of the first example is a winding element having the structure of the second embodiment shown in FIG. 5, and the winding element of the comparative example is a winding element having the structure shown in FIG. In these measurements, the vibration acceleration is also measured under the conditions in which the attractive magnetic force is equal at each drive frequency in the measurement of the following examples. As shown in FIG. Measured in position.

As shown in FIG. 13, the winding element of the comparative example has a peak vibration acceleration at about 11 kHz, and this about 11 kHz is the natural frequency, but the winding element of the first embodiment has about 13 kHz. The vibration acceleration has a peak at about 13 kHz, which is the natural frequency. Thus, the winding element of the first embodiment has a natural frequency shifted to the high frequency side as compared with the winding element of the comparative example, and the vibration is further suppressed. For this reason, the winding element of the first embodiment can be used without resonance up to a higher driving frequency than the winding element of the comparative example.

FIG. 14 is a diagram for explaining the difference in natural frequency due to the difference in the contour shape of the core portion. 14 shows a winding element including the core portion 4 having the structure shown in FIG. 6A (the right column in FIG. 14) and a winding element having the core portion 3 having the structure shown in FIG. In the left column of FIG. 14, the natural frequencies of the primary resonance mode (upper part of FIG. 14) and the secondary resonance mode (lower part of FIG. 14) are shown. FIG. 14 shows a simulation result in the case where the core parts 4 and 3 are modeled as a single unit.

As shown in FIG. 14, the natural frequencies of the primary resonance mode and the secondary resonance mode in the winding element including the core portion 3 having the structure shown in FIG. 6B are 5480 Hz and 10740 Hz, respectively. The natural frequencies of the primary resonance mode and the secondary resonance mode in the winding element including the core portion 4 having the structure shown in FIG. 6 (A) are 6320 Hz and 11700 Hz, respectively, and the core shape is changed by changing the outer shape of the core portion. The natural frequency is improved by further providing a thick portion in the portion. Thus, the winding element including the core portion 4 having the structure shown in FIG. 6A has a natural frequency on the high frequency side as compared with the winding element including the core portion 3 having the structure shown in FIG. It is shifted, vibration is further suppressed, and it can be used without resonance up to a higher driving frequency.

FIG. 15 is a diagram for explaining a difference in natural frequency due to the presence or absence of a connecting member and a difference. The horizontal axis in FIG. 15 is the drive frequency (kHz), and the vertical axis is the vibration acceleration.

FIG. 15 shows the measurement results (measurement position center position; ◯, measurement position end position; Δ) in the winding element having the structure without the connection member shown in FIG. 5 and the connection of the second mode shown in FIG. The measurement result (measurement position center position; ●, measurement position end position; ▲) in the winding element having the member, and corresponding to the second mode shown in FIG. The measurement results (the measurement position center position; □, the measurement position end position; ■) in each of the winding elements are shown.

For the connecting member in the winding element having the connecting member of the second mode shown in FIG. 7B, for example, a two-component curable epoxy resin having a Young's modulus at room temperature of 10 GPa or more is used. After the part was formed, the resin was poured into the core part, and after the core part was sealed, the resin was cured therein. Further, the ring-shaped connecting member has a relatively high Young's modulus and has a small temperature dependency, and therefore ceramics, for example, ceramics containing 90% by mass or more of alumina and having a Young's modulus of 250 GPa or more is used. It was.

As shown in FIG. 15, in the winding element without the connecting member, the natural frequency that was between about 6 and 7 kHz is at least higher than 16 kHz. By providing the connecting member in this manner, the winding element has a natural frequency shifted to the high frequency side compared to the case where the connecting member is not provided, the vibration is further suppressed, and resonance is achieved up to a higher driving frequency. Can be used without.

FIG. 16 is a diagram for explaining a difference in natural frequency depending on the presence or absence of a gap filling material. The horizontal axis in FIG. 16 is the drive frequency (kHz), and the vertical axis is the vibration acceleration.

FIG. 16 shows a measurement result (measurement position end position; Δ) when there is no gap filling material in the winding element having the structure shown in FIG. 5 and a measurement result (measurement position end position when there is a gap filling material). ;) Are shown respectively. For the gap filling material, for example, a two-component curable epoxy resin (not an adhesive) having a Young's modulus at room temperature of 10 GPa or more was used.

As shown in FIG. 16, the natural frequency was about 13 kHz in the winding element without the gap filling material, but the natural frequency was about 14.5 kHz in the winding element with the gap filling material. By providing the gap filling material in this way, the winding element has a natural frequency shifted to a higher frequency side than when no gap filling material is provided, and the vibration is further suppressed, so that the drive frequency is higher. Can be used without resonance.

FIG. 17 is a diagram showing a change in vibration acceleration with respect to a change in temperature depending on the presence or absence of a fastening member. The horizontal axis in FIG. 17 is the temperature (° C.) of the core surface, and the vertical axis is the vibration acceleration.

FIG. 17 shows the measurement results (measurement position center position; ◯, measurement position end position; Δ) in the winding element when the connecting member is filled in the internal space as shown in FIG. As shown in FIG. 7B, the connecting member is filled in the internal space, and the first and second core members are fastened with the bolts and nuts as the fastening members as shown in FIG. 8B. The measurement results (measurement position center position; ●, measurement position end position; ▲) in the winding element are shown respectively. The drive frequency was 10 kHz, the bolt and nut were M6, and were tightened with a torque of 8 Nm. The temperature rise of these winding elements is caused by self-heating due to continuous driving.

As shown in FIG. 17, in the case where the fastening member is not provided, the vibration also increases as the temperature of the core portion surface increases. However, in the case where the fastening member is provided, even if the temperature of the core portion surface increases. The vibration is substantially constant, and the temperature dependence of the vibration is substantially eliminated. This is considered that the softening of the connecting member is suppressed by the fastening by the fastening member.

FIG. 18 is a diagram showing the vibration distribution in the winding element having the structure shown in FIG. 8 (B). The winding element of this embodiment has the structure of the winding element Df2 described with reference to FIG. FIG. 18 shows the vibration distribution of the upper surface (the upper surface of the core portion 41b) (or the lower surface (the lower surface of the core portion 42b)) of the core portion 4b in the winding element Df2 of this embodiment. The measurement position is an edge position (end position), a center position, and an intermediate position between the edge position and the center position on each line that can be generated when a certain diagonal line is rotated by about 45 degrees. Each of the three positions. In addition, the measurement result at each measurement position is normalized by setting the magnitude of the vibration displacement at the center position to 1. As can be seen from FIG. 18, the position where the vibration displacement in the core portion 4b is relatively small is the edge circumferential position, and the position where the vibration displacement is relatively large is the center position. Therefore, as shown in FIG. 9B, the winding element Df2 having such a structure is propagated to the attached member 200 by attaching the winding element to the attached member 200 at the edge peripheral position of the core portion 4b. The vibration of the winding element Df2 is suppressed.

This specification discloses various modes of technology as described above, and the main technologies are summarized below.

A winding element according to one aspect is a winding element including one or a plurality of coils and a core portion through which a magnetic flux generated by the coils is passed, and the coil is formed by winding a long conductor member. An air-core coil, wherein the core portion is disposed outside the coil and includes a plurality of members, and contact surfaces of the plurality of members are oblique or orthogonal to the axial direction of the coils. ing. And preferably, the said coil is comprised by winding a strip | belt-shaped conductor member so that the width direction of this conductor member may follow the axial direction of this coil.

In the winding element having such a configuration, the core portion is composed of a plurality of members, and the contact surfaces of the plurality of members are oblique or orthogonal to the axial direction of the coil. Here, the magnetic force generated by the coil is mainly generated along the axial direction of the coil. Therefore, the contact surfaces of the plurality of members are oblique or orthogonal to the axial direction of the coils against the magnetic force generated along the axial direction of the coil. When the surfaces abut each other, the plurality of members are firmly brought into contact with each other, so that vibrations thereof can be suppressed and noise can be reduced. For this reason, the contact surfaces of the plurality of members may be oblique with respect to the axial direction of the coil, but it is more effective and preferable to be orthogonal. Thus, in the winding element including the air-core coil and the core portion disposed outside the air-core coil, vibration is reduced and noise is also reduced.

In another aspect, in the above-described winding element, the coil has a cylindrical shape, and the core portion includes a cylindrical space for containing the coil, and the core portion. The outline shape is a polygonal prism shape.

In the winding element having such a configuration, the core portion has a thicker portion than the case where the contour shape of the core portion is a cylindrical shape. For this reason, the winding element having such a configuration can further improve the rigidity of the core portion, and can shift the natural frequency to the high frequency side as compared with the case where the contour shape of the core portion is a columnar shape.

Further, in another aspect, in the above-described winding element, at least the two portions of the core portion facing at both ends of the axial center of the coil are connected at least inside the axial core of the coil. A connecting member is further provided.

Since the winding element having such a configuration further includes a connecting member, it is possible to suppress vibrations of both portions of the core portion facing both end portions of the axial center of the coil, and the rigidity of the core portion is further improved. Therefore, the natural frequency can be shifted to the high frequency side as compared with the case where the connecting member is not provided.

In another aspect, in the winding element described above, at least one of the contact surface and the connecting surface between the core portion and the connecting member further includes a gap filling material that fills the gap.

The winding element having such a configuration further includes a gap filling material on at least one of the contact surface and the connection surface, thereby improving the adhesion of the contact surface and the connection surface including the gap filling material, Vibration can be further suppressed.

Further, in another aspect, in the above-described winding element, the contact surface further includes a gap filling material that fills the gap.

In the winding element having such a configuration, by further providing a gap filling material on the contact surface, the adhesion of the contact surface and the connection surface provided with the gap filling material is improved, and vibration can be further suppressed. It becomes.

In another aspect, the above-described winding element further includes a fastening member that fastens a plurality of members constituting the contact surface to each other.

The winding element having such a configuration further includes a fastening member, thereby improving the adhesion of the contact surface and further suppressing vibration.

In another aspect, in the above-described winding element, the fastening member is also used as a fixing member that fixes the winding element to a member to which the winding element is attached.

In the winding element having such a configuration, since the fastening member is also used as a fixing member, it is not necessary to prepare a fixing member separately, and the cost can be reduced.

In another aspect, in the above-described winding elements, the core portion has a convex portion extending into the axial center of the coil.

In the winding element configured as described above, the gap length between the upper portion and the lower portion of the core portion inside the axial center of the coil can be adjusted by the convex portion, and the inductance can be adjusted.

This application is based on Japanese Patent Application No. 2010-198481 filed on September 6, 2010 and Japanese Patent Application No. 2011-107845 filed on May 13, 2011. The contents thereof are included in the present application.

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. It is interpreted that it is included in

According to the present invention, it is possible to provide a winding element including one or a plurality of coils and a core part through which the magnetic flux generated by the coils passes.

Claims (8)

1. A winding element comprising one or more coils and a core portion through which the magnetic flux generated by the coils passes;
   The coil is an air-core coil wound with a long conductor member,
   The core portion is disposed outside the coil and is configured by a plurality of members, and a contact surface of the plurality of members is oblique or orthogonal to the axial direction of the coil. Winding element to do.
2. The outline shape of the coil is a cylindrical shape,
   The winding element according to claim 1, wherein the core portion has a cylindrical space for enclosing the coil, and a contour shape of the core portion is a polygonal column shape.
3. The connecting member for connecting at least both portions of the core portion facing at both ends of the axial center of the coil and at least disposed inside the axial core of the coil. The winding element according to 2.
4. 4. The winding element according to claim 3, further comprising a gap filling material that fills the gap in at least one of the contact surface and the connection surface between the core portion and the connection member.
5. The winding element according to claim 1, further comprising a gap filling material that fills the gap on the contact surface.
6. The winding element according to claim 1, further comprising a fastening member that fastens a plurality of members constituting the contact surface to each other.
7. The winding element according to claim 6, wherein the fastening member is also used as a fixing member that fixes the winding element to an attached member to which the winding element is attached.
8. The winding element according to claim 1, wherein the core portion has a convex portion that extends into the axial center of the coil.

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