WO2022209760A1 - コア片、リアクトル、コンバータ、及び電力変換装置 - Google Patents
コア片、リアクトル、コンバータ、及び電力変換装置 Download PDFInfo
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- H—ELECTRICITY
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- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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Definitions
- the present disclosure relates to core pieces, reactors, converters, and power converters.
- This application claims priority based on Japanese Patent Application No. 2021-056130 dated March 29, 2021, and incorporates all the descriptions described in the Japanese application.
- the reactor of Patent Document 1 includes a coil and a magnetic core.
- a magnetic core is configured by combining a plurality of core pieces. Some core pieces are made of molded hardened material.
- a molded hardened body is a molded body of a composite material in which soft magnetic powder is dispersed in a resin.
- the core piece of the present disclosure is a core piece composed of a molded body of a composite material in which soft magnetic powder is dispersed in a resin, and includes a middle core portion disposed inside a coil and an end core facing an end face of the coil. and the middle core portion has a hole or groove extending in the axial direction of the coil, and in the cross section of the middle core portion, the radius of the first inscribed circle is the radius of the reference inscribed circle. is 0.6 times or less of the first inscribed circle is the maximum inscribed circle between the contour line of the hole or groove in the cross section and the outer contour line of the middle core portion in the cross section, and the reference inscribed circle is the maximum and the first imaginary outline is the smallest quadrilateral that circumscribes the cross section.
- a reactor of the present disclosure is a reactor including a coil and a magnetic core, wherein the coil has one winding portion, and the magnetic core is a combination of a first core piece and a second core piece. and at least one of the first core piece and the second core piece is the core piece of the present disclosure.
- the converter of the present disclosure includes the reactor of the present disclosure.
- the power conversion device of the present disclosure includes the converter of the present disclosure.
- FIG. 1 is a perspective view showing the outline of the reactor of Embodiment 1.
- FIG. 2 is a perspective view showing an outline of an exploded state of the reactor of Embodiment 1.
- FIG. 3 is a top view showing the outline of the reactor of Embodiment 1.
- FIG. 4 is a sectional view taken along line IV-IV of FIG.
- FIG. 5 is a cross-sectional view taken along line VV of FIG.
- FIG. 6 is a sectional view taken along line VI-VI in FIG. 7 is a cross-sectional view of another example of the first core piece provided in the reactor of Embodiment 1.
- FIG. 8 is a cross-sectional view of another example of the first core piece provided in the reactor of Embodiment 1.
- FIG. 8 is a cross-sectional view of another example of the first core piece provided in the reactor of Embodiment 1.
- FIG. 9 is a horizontal cross-sectional view of a first core piece provided in the reactor of Embodiment 2.
- FIG. 10 is a horizontal cross-sectional view of another example of the first core piece provided in the reactor of Embodiment 2.
- FIG. 11 is a cross-sectional view of a first core piece provided in the reactor of Embodiment 3.
- FIG. 12 is a vertical cross-sectional view of a first core piece provided in the reactor of Embodiment 3.
- FIG. 13 is a horizontal cross-sectional view of a first core piece provided in the reactor of Embodiment 3.
- FIG. 14 is a cross-sectional view of a first core piece provided in the reactor of Embodiment 4.
- FIG. 15 is a vertical cross-sectional view of a first core piece provided in the reactor of Embodiment 4.
- FIG. 16 is a cross-sectional view of a first core piece provided in the reactor of Embodiment 5.
- FIG. 17 is a vertical cross-sectional view of a first core piece provided in the reactor of Embodiment 5.
- FIG. 18 is a horizontal cross-sectional view of a first core piece provided in the reactor of Embodiment 5.
- FIG. FIG. 19 is a configuration diagram schematically showing a power supply system of a hybrid vehicle.
- FIG. 20 is a schematic circuit diagram of an example of a power conversion device including a converter.
- a molded body of composite material is manufactured as follows.
- the raw material for the molded body of the composite material is poured into the mold.
- the raw material is a fluid material in which soft magnetic powder is dispersed in unsolidified resin.
- the raw material resin is solidified.
- the solidification speed of the surface of the core piece in contact with the mold is faster than the solidification speed of the core piece's interior. Voids are formed inside the core piece when the difference in the solidification rate between the fastest solidifying and the slowest solidifying locations is large.
- the reactor When using the reactor, the reactor itself vibrates. In addition, depending on the location where the reactor is mounted, the reactor may vibrate due to transmission of external vibrations to the reactor. The voids may become starting points of cracks due to vibration.
- the core pieces of the present disclosure have less voids.
- the converter of the present disclosure and the power converter of the present disclosure have stable performance.
- a core piece according to an embodiment of the present disclosure is a core piece made of a molded body of a composite material in which soft magnetic powder is dispersed in a resin, the middle core portion being arranged inside the coil; and an end core portion facing the end surface of the coil, the middle core portion having a hole or groove extending in the axial direction of the coil, and the radius of a first inscribed circle in the cross section of the middle core portion. is 0.6 times or less than the radius of the reference inscribed circle, and the cross section is a cross section obtained by cutting the middle core portion on a plane orthogonal to the axial direction of the coil so as to pass through the hole or the groove.
- the first inscribed circle is the largest inscribed circle between the contour line of the hole or groove in the cross section and the outer contour line of the middle core portion in the cross section
- the reference inscribed circle is , is the largest inscribed circle in a first imaginary outline, and said first imaginary outline is the smallest quadrangle circumscribing said cross section.
- the difference in solidification speed between the fastest solidifying portion and the slowest solidifying portion in the manufacturing process is the middle core portion of the core piece. It tends to be larger than other parts. If the solidification speed difference is large, voids are likely to be formed as described above. That is, voids are likely to be formed in the middle core portion.
- the radius of the first inscribed circle is 0.6 times or less than the radius of the reference inscribed circle, so voids are less likely to be formed. Therefore, since the core pieces have few voids, it is easy to construct a reactor in which cracks are less likely to occur in the middle core portion due to vibration.
- the inner area of the hole or the groove in the cross section is 10% or less of the area of the second imaginary outline, and the second imaginary outline envelops the cross section. It may be of minimal shape.
- the core piece has a small difference in the solidification speed of the middle core portion, and also tends to suppress a decrease in the magnetic path area of the middle core portion or an increase in the size of the middle core portion.
- the hole or the groove may be provided so as to overlap the center of gravity of the first imaginary outline.
- the solidification speed is likely to be slowest at the center of gravity of the first imaginary outline.
- the core piece is provided with a hole or a groove so as to overlap the center of gravity of the first imaginary outer shape, so that the slowest solidification rate is the slowest solidification rate in the absence of the hole and the groove. Faster than solidification speed. Therefore, the core piece can easily reduce the difference in the solidification speed of the middle core portion.
- the middle core portion may have the hole, and the contour shape of the hole may be circular or angular.
- a void is less likely to be formed in the core piece having the contour-shaped hole. Moreover, the core pieces with the contoured holes are easy to mold.
- the middle core portion may have the groove portion, and the cross section may be configured in an H shape, a U shape, or two parallel I shapes.
- Voids are less likely to be formed in the core piece having the cross-sectional shape. Moreover, the core piece having the cross-sectional shape is easy to mold.
- the hole or groove may be provided continuously from the end surface of the middle core portion to the outer surface of the end core portion.
- the above core piece is suitable for a reactor provided with a mold resin portion, which will be described later.
- the reason for this is that the hole can be used as a flow path for the raw material of the mold resin portion in the process of forming the mold resin portion.
- the hole or the groove is provided continuously from the end surface of the middle core portion to the middle of the end core portion, or from the outer surface of the end core portion to the middle of the middle core portion,
- the radius of the second inscribed circle is 0.6 times or less than the radius of the reference inscribed circle
- the longitudinal section is a plane orthogonal to the side view direction of the core piece. It is a cross section obtained by cutting the core piece so as to pass through the hole or the groove, and the second inscribed circle is the bottom of the hole or the end of the groove and the end surface of the middle core in the longitudinal section. or the maximum inscribed circle that contacts the bottom of the hole or the end of the groove and the outer surface of the end core portion.
- the radius of the second inscribed circle is 0.6 times or less than the radius of the reference inscribed circle, voids are less likely to be formed, and cracks are less likely to occur due to vibration.
- the hole or the groove is provided continuously from the end surface of the middle core portion to the middle of the end core portion, or from the outer surface of the end core portion to the middle of the middle core portion,
- the radius of the third inscribed circle is 0.6 times or less than the radius of the reference inscribed circle
- the horizontal cross section is a plane perpendicular to the plane view direction of the core piece. It is a cross section obtained by cutting the core piece so as to pass through the hole or the groove
- the third inscribed circle is the bottom of the hole or the end of the groove and the end face of the middle core in the horizontal cross section. or a maximum inscribed circle that touches the bottom of the hole or the end of the groove and the outer surface of the end core portion.
- a reactor according to an aspect of the present disclosure is a reactor including a coil and a magnetic core, the coil has one winding portion, and the magnetic core includes a first core piece and a second At least one of the first core piece and the second core piece is the core piece according to any one of (1) to (8) above.
- the reactor includes the core pieces, cracks are less likely to occur in the core pieces due to vibration.
- a converter according to an aspect of the present disclosure includes the reactor of (9) above.
- a power converter according to one aspect of the present disclosure includes the converter of (10) above.
- the power conversion device includes the converter, its performance is stable.
- FIG. 1 A reactor 1 according to the first embodiment will be described with reference to FIGS. 1 to 8.
- FIG. The reactor 1 includes a coil 2 and a magnetic core 3, as shown in FIG.
- the coil 2 has one winding portion 21 .
- the magnetic core 3 is a combination of a first core piece 3f and a second core piece 3s.
- One of the features of the reactor 1 of this embodiment is that at least one of the first core piece 3f and the second core piece 3s has a specific hole 34 as shown in FIG.
- FIG. 3 shows the coil 2 with a two-dot chain line for convenience of explanation.
- the coil 2 has one hollow winding portion 21, as shown in FIGS.
- the reactor 1 having one winding part 21 has the same cross-sectional area and the same When the number of turns is used, the length along the second direction D2, which will be described later, can be shortened.
- the shape of the winding portion 21 may be a square tube shape or a cylindrical shape.
- the rectangular tubular shape is a square tubular shape or a rectangular tubular shape.
- the shape of the winding part 21 of this embodiment is a square cylinder shape, as shown in FIG. That is, the end face shape of the winding portion 21 is a square frame shape. Since the shape of the winding portion 21 is a rectangular tube, it is easier to increase the contact area between the winding portion 21 and the installation target as compared with the case where the winding portion 21 is cylindrical with the same cross-sectional area. Therefore, the reactor 1 easily dissipates heat to the installation target via the winding portion 21 . Moreover, the winding part 21 can be stably and easily installed on the installation target. The corners of the winding portion 21 are rounded.
- the winding part 21 is configured by spirally winding a single winding without joints.
- a known winding can be used for the winding.
- the winding wire of this embodiment uses a covered rectangular wire.
- the conductor wire of the coated rectangular wire is composed of a copper rectangular wire.
- the insulating coating of the coated rectangular wire is made of enamel.
- the wound portion 21 is formed of an edgewise coil obtained by edgewise winding a coated rectangular wire.
- a first end portion 21a and a second end portion 21b of the winding portion 21 are respectively extended to the outer peripheral side of the winding portion 21 at one end and the other end in the axial direction of the winding portion 21 in this embodiment.
- the first end portion 21a and the second end portion 21b of the wound portion 21 have their insulating coating stripped off to expose the conductor wires.
- the exposed conductor wire is drawn out of the mold resin portion 4, which will be described later, and is connected to a terminal member. Illustration of the terminal member is omitted.
- An external device is connected to the coil 2 through this terminal member. Illustration of the external device is omitted.
- the external device is, for example, a power source that supplies power to the coil 2 .
- the magnetic core 3 has a middle core portion 31, a first side core portion 321 and a second side core portion 322, and a first end core portion 33f and a second end core portion 33s.
- the direction along the axial direction of the winding portion 21 is the first direction D1
- the parallel direction of the middle core portion 31, the first side core portion 321, and the second side core portion 322 is the second direction D2
- the second direction D2 is the third direction D3.
- Middle core portion 31 has a portion disposed inside winding portion 21 .
- the shape of the middle core portion 31 is, for example, a shape corresponding to the inner peripheral shape of the winding portion 21 .
- the shape of the middle core portion 31 is a quadrangular prism as shown in FIG.
- the corners of the middle core portion 31 may be rounded along the inner peripheral surface of the corners of the winding portion 21 .
- the length of the middle core portion 31 along the first direction D1 is substantially the same as the length of the winding portion 21 along the axial direction, as shown in FIG.
- the length of the middle core portion 31 along the first direction D1 is the length L1f of the first middle core portion 31f along the first direction D1 and the length L1s of the second middle core portion 31s along the first direction D1, which will be described later. is the total length of (L1f+L1s).
- the length of the middle core portion 31 along the first direction D1 does not include the length Lg of the gap portion 3g along the first direction D1, which will be described later. The same meaning applies to other lengths of the core portion.
- the length of the middle core portion 31 along the first direction D1 is longer than the length of the first side core portion 321 along the first direction D1 and the length of the second side core portion 322 along the first direction D1.
- the length of the first side core portion 321 along the first direction D1 is the length L21f of the first side core portion 321f along the first direction D1 and the length of the first side core portion 321s along the first direction D1, which will be described later. is the total length (L21f+L21s) of the length L21s.
- the length of the second side core portion 322 along the first direction D1 is the length L22f of the second side core portion 322f along the first direction D1 and the length of the second side core portion 322s along the first direction D1, which will be described later. is the total length (L22f+L22s) of the length L22s.
- the length of the middle core portion 31 along the first direction D1 is the length of the first side core portion 321 along the first direction D1 and the length of the second side core portion 322 along the first direction D1. may be equivalent to
- the combination of the first core piece 3f and the second core piece 3s is the EE type of the present embodiment, or the ET type or the FF type described later. It may be composed of two core portions, a middle core portion 31f and a second middle core portion 31s. Although illustration is omitted, the middle core portion 31 is composed of one first middle core portion 31f, such as the combination of the EI type, the EU type, the TU type, or the FL type. sometimes
- first side core portion 321 and the second side core portion 322 are arranged to face each other so as to sandwich the middle core portion 31 therebetween.
- the first side core portion 321 and the second side core portion 322 are arranged on the outer circumference of the winding portion 21 .
- the shape of the first side core portion 321 and the shape of the second side core portion 322 are the same shape, and in this embodiment, they are thin prismatic shapes.
- the length (L21f+L21s) of the first side core portion 321 and the length (L22f+L22s) of the second side core portion 322 are longer than the length along the axial direction of the winding portion 21, as shown in FIG.
- the length of the first side core portion 321 along the first direction D1 and the length of the second side core portion 322 along the first direction D1 may be equal to the length of the winding portion 21 along the axial direction. .
- the combination of the first core piece 3f and the second core piece 3s of the first side core portion 321 is the EE type of this embodiment, and the combination of the first side core portion 321f and the EU type described later. In some cases, it is composed of two core portions of the first side core portion 321s.
- the first side core portion 321 is, for example, one second core portion such as the ET type, the EI type, the TU type, the FF type, or the FL type. It may be composed of one side core portion 321f.
- the second side core portion 322 may be composed of two core portions, a second side core portion 322f and a second side core portion 322s, for example, such as an EE type or an EU type combination.
- the second side core portion 322 is, for example, one second side core portion 322, such as an ET type, an EI type, a TU type, an FF type, or an FL type. It may be composed of two side core portions 322f.
- the total cross-sectional area of the first side core portion 321 and the cross-sectional area of the second side core portion 322 is the same as the cross-sectional area of the middle core portion 31 .
- the middle core portion 31, the first side core portion 321, and the second side core portion 322 have the same length along the third direction D3. That is, the sum of the length of the first side core portion 321 along the second direction D2 and the length of the second side core portion 322 along the second direction D2 is equal to the length of the middle core portion 31 along the second direction D2. Equivalent to.
- the length of the first side core portion 321 along the second direction D2 and the length of the second side core portion 322 along the second direction D2 are 0.5 times the length of the middle core portion 31 along the second direction D2. is.
- the lengths of the first side core portion 321 and the second side core portion 322 along the third direction D3 are equal to or longer than the length of the middle core portion 31 along the second direction D2.
- the first end core portion 33f faces the first end surface of the winding portion 21 .
- the second end core portion 33 s faces the second end surface of the winding portion 21 . Facing means that the inner surface 33i of the first end core portion 33f and the first end surface of the winding portion 21 face each other. Also, it means that the inner surface of the second end core portion 33s and the second end surface of the winding portion 21 face each other.
- the shape of the first end core portion 33f and the shape of the second end core portion 33s are thin prismatic shapes, as shown in FIGS.
- the length of the first end core portion 33f along the second direction D2 is longer than the length of the winding portion 21 along the second direction D2.
- the length of the first end core portion 33f along the third direction D3 is shorter than the length of the winding portion 21 along the third direction D3, as shown in FIG.
- the length of the first end core portion 33f along the third direction D3 may be longer than or equal to the length of the wound portion 21 along the third direction D3.
- the length along the second direction D2 and the length along the third direction D3 of the second end core portion 33s are the same as those of the first end core portion 33f.
- first core piece/Second core piece Various combinations of the first core piece 3f and the second core piece 3s can be made by appropriately selecting the shapes of the first core piece 3f and the second core piece 3s.
- the shape of the first core piece 3f and the shape of the second core piece 3s may be asymmetrical as in this embodiment, or may be symmetrical unlike this embodiment.
- Asymmetric means different shapes.
- Symmetric means identical in shape and size.
- the first core piece 3f and the second core piece 3s are divided in the first direction D1 as shown in FIG.
- the combination of the first core piece 3f and the second core piece 3s is EE type.
- the combinations of the first core piece 3f and the second core piece 3s are EI type, ET type, EU type, TU type, and FF type, although illustration is omitted. type, or FL type. Since the reactor 1 can be constructed by combining the first core piece 3f and the second core piece 3s with respect to the winding portion 21 along the axial direction of the winding portion 21, the manufacturing workability is excellent.
- a gap portion 3g which will be described later, may be provided, or the gap portion 3g may not be provided.
- the E-shaped first core piece 3f of this embodiment has a first middle core portion 31f, a first side core portion 321f, a second side core portion 322f, and a first end core portion 33f.
- the first middle core portion 31 f forms part of the middle core portion 31 .
- the first side core portion 321f constitutes a part of the first side core portion 321.
- the second side core portion 322f constitutes a part of the second side core portion 322.
- the first core piece 3f is a molded body in which a first middle core portion 31f, a first side core portion 321f, a second side core portion 322f, and a first end core portion 33f are integrated.
- the first end core portion 33f has an inner surface 33i and an outer surface 33o.
- the inner surface 33i is a surface facing the first end surface of the winding portion 21 as described above.
- the outer surface 33o is a surface provided on the side opposite to the inner surface 33i in the first direction D1.
- the outer peripheral surfaces of the first middle core portion 31f, the first side core portion 321f, and the second side core portion 322f are connected to the inner surface 33i.
- the first side core portion 321f and the second side core portion 322f are provided at both ends of the first end core portion 33f in the second direction D2.
- the first middle core portion 31f is provided in the center of the first end core portion 33f in the second direction D2.
- the second core piece 3s of this embodiment which has an E-shape asymmetrical to the first core piece 3f, includes a second middle core portion 31s, a first side core portion 321s, a second side core portion 322s, and a second core portion 322s. and an end core portion 33s.
- the second middle core portion 31 s constitutes the remainder of the middle core portion 31 .
- the first side core portion 321 s constitutes the remainder of the first side core portion 321 .
- the second side core portion 322 s constitutes the remainder of the second side core portion 322 .
- the second core piece 3s is a molded body in which a second middle core portion 31s, a first side core portion 321s, a second side core portion 322s, and a second end core portion 33s are integrated.
- the connection manner and position of each core portion in the second core piece 3s are the same as the connection manner and position of each core portion in the first core piece 3f described above.
- the end surface of the first side core portion 321f and the end surface of the first side core portion 321s are in contact with each other, and the end surface of the second side core portion 322f and the end surface of the second side core portion 322s are in contact with each other. combined to make contact.
- a gap is provided between the end face 311e of the first middle core portion 31f and the end face 312e of the second middle core portion 31s. The length of this interval along the first direction D1 corresponds to the length Lg of the gap portion 3g along the first direction D1.
- first core piece 3f and the second core piece 3s are provided with a gap between the end surface of the first side core portion 321f and the end surface of the first side core portion 321s. They may be combined so that a gap is provided between the end face and the end face of the second side core portion 322s.
- the end face 311e of the first middle core portion 31f and the end face 312e of the second middle core portion 31s There is also an interval between
- the distance between the end surface 311e and the end surface 312e is the distance between the end surface of the first side core portion 321f and the end surface of the first side core portion 321s
- the distance between the end surface of the second side core portion 322f and the second side core portion 322s. is larger than the distance between the end faces of the
- the first core piece 3f and the second core piece 3s are preferably combined by a mold resin portion 4, which will be described later.
- the core piece made of a molded composite material has a hole 34 as shown in FIGS.
- the entire first core piece 3f is made of a molded composite material.
- All of the second core pieces 3s are made of a compacted body. That is, in this embodiment, the first core piece 3f has the hole 34 and the second core piece 3s does not have the hole 34. As shown in FIG.
- FIG. 4 shows a cross section obtained by cutting the first core piece 3f so as to pass through the hole 34 on a plane orthogonal to the first direction D1.
- FIGS. 7 and 8 show cross sections obtained by cutting the first core piece 3f at the same position as the cross section shown in FIG.
- the contour shape, size, and formation location of the hole 34 in the cross section of the first middle core portion 31f satisfy that the radius r1 of the first inscribed circle C1 is 0.6 times or less the radius r0 of the reference inscribed circle C0. can be selected as appropriate.
- the first inscribed circle C1 of this embodiment is the largest inscribed circle between the outer peripheral contour of the first middle core portion 31f and the contour of the hole portion 34 in the cross section of the first middle core portion 31f.
- the reference inscribed circle C0 is the largest inscribed circle in the first imaginary outline V1.
- the first imaginary outer shape V1 is the smallest quadrangle that circumscribes the cross section of the first middle core portion 31f.
- Radius r1 may also be less than or equal to 0.55 times radius r0, in particular less than or equal to 0.5 times radius r0. Radius r1 may be, for example, 0.44 times or more of radius r0.
- the radius r1 is 0.44 times or more the radius r0, the magnetic path area of the first middle core portion 31f does not become too small, so deterioration of the magnetic properties of the first core piece 3f is easily suppressed.
- the radius r1 is 0.44 to 0.6 times the radius r0, further 0.44 to 0.55 times the radius r0, particularly 0.44 to 0.5 times the radius r0. It may be below.
- the contour shape of the hole portion 34 in the cross section of the first middle core portion 31f is, for example, circular or angular.
- the circular shape includes, for example, a perfect circle shown in FIG. 4, an ellipse (not shown), or a racetrack shape shown in FIG.
- the outline of the racetrack shape is composed of a first straight line, a second straight line, a first arc line and a second arc line.
- the first straight line and the second straight line are parallel to each other and have the same length.
- the first straight line is located on the upper side of the paper surface
- the second straight line is located on the lower side of the paper surface.
- the first arc line connects the first end of the first straight line and the first end of the second straight line.
- a second arc line connects the second end of the first straight line and the second end of the second straight line.
- the first arc line and the first end are positioned on the left side of the paper, and the second arc line and the second end are positioned on the right side of the paper.
- Angular shapes include, for example, squares or hexagons.
- a quadrangle includes a square shape shown in FIG. 7 or a rectangular shape not shown.
- Angular shapes include shapes with rounded corners.
- the size of the hole 34 in the cross section of the first middle core portion 31f may be 10% or less of the area S2 of the second imaginary outer shape V2.
- the inside of the hole 34 is the area surrounded by the outline of the hole 34 .
- the second imaginary outer shape V2 is the smallest shape that envelops the cross section of the first middle core portion 31f.
- the second imaginary outline V2 since the cross-sectional shape of the first middle core portion 31f is square, the second imaginary outline V2 has the same shape and size as the first imaginary outline V1.
- the second imaginary outer shape V2 is circular and has a shape and size different from those of the first imaginary outer shape V1.
- the first core piece 3f whose area S1 is 10% or less of the area S2 can suppress the formation of voids inside the first middle core portion 31f during the manufacturing process of the first core piece 3f. In addition, the first core piece 3f easily suppresses a decrease in the magnetic path area of the first middle core portion 31f or an increase in the size of the first middle core portion 31f.
- the area S1 may also be 7% or less of the area S2, in particular 5% or less of the area S2.
- the area S1 may be 1% or more of the area S2. In the first core piece 3f whose area S1 is 1% or more of the area S2, voids are less likely to be formed inside the first core piece 3f during the manufacturing process of the first core piece 3f.
- the area S1 may be 1% or more and 10% or less of the area S2, further 1% or more and 7% or less of the area S2, especially 2% or more and 5% or less of the area S2.
- the position where the hole 34 is formed in the cross section of the first middle core portion 31f may be a position overlapping the center of gravity of the first imaginary outer shape V1.
- the center of gravity of the first virtual outline V1 is the intersection of the diagonal lines of the first virtual outline V1.
- the hole 34 overlapping the center of gravity of the first imaginary outline V1 means that the outline of the hole 34 surrounds the center of gravity of the first imaginary outline V1. If there is no hole 34, the solidification speed at the location where the center of gravity of the first imaginary outline V1 is located is likely to be the slowest. Since the hole 34 is provided so as to overlap the center of gravity of the first imaginary outline V1, the solidification rate of the slowest solidification point in the case of having the hole 34 is the slowest solidification rate in the absence of the hole 34.
- the hole portion 34 is provided so as to overlap the center of gravity of the first imaginary outline V1, the length between the outer peripheral surface of the first middle core portion 31f and the contour of the hole portion 34 is the circumference of the hole portion 34. Easier to be even in all directions.
- the hole 34 may be provided so that the center of gravity of the area surrounded by the outline of the hole 34 and the center of gravity of the first imaginary outer shape V1 coincide.
- the center of gravity of the area surrounded by the contour of the hole 34 is the center of the perfect circle.
- the contour shape of the hole 34 is square, the center of gravity of the area surrounded by the contour of the hole 34 is the intersection of the diagonal lines of the square.
- the contour shape of the hole 34 is a racetrack shape, the center of gravity of the area surrounded by the contour of the hole 34 is the intersection of the first diagonal line and the second diagonal line.
- the first diagonal line is a straight line connecting the first end of the first straight line and the second end of the second straight line.
- the second diagonal line is a straight line connecting the second end of the first straight line and the first end of the second straight line.
- the hole portion 34 extends in the first direction D1 in the first middle core portion 31f.
- the holes 34 are through holes as shown in FIGS.
- FIG. 5 shows a vertical cross section of the first core piece 3f taken along a plane orthogonal to the side view direction of the first core piece 3f so as to pass through the hole 34.
- the side viewing direction is the second direction D2.
- FIG. 5 shows a state in which the first middle core portion 31f whose contour shape of the hole portion 34 is the perfect circle shown in FIG. 4 is cut.
- FIG. 6 shows a horizontal cross section obtained by cutting the first core piece 3f so as to pass through the hole 34 on a plane perpendicular to the plane view direction of the first core piece 3f.
- the plan view direction is the third direction D3.
- FIG. 6 shows a cut state of the first middle core portion 31f in which the contour shape of the hole portion 34 is the perfect circle shown in FIG.
- the hole portion 34 which is a through hole, is provided continuously from the end surface 311e of the first middle core portion 31f to the outer surface 33o of the first end core portion 33f. That is, the opening of the hole 34 is connected to each of the end surface 311e and the outer surface 33o.
- the hole portion 34 allows the raw material of the mold resin portion 4 to flow from the outside of the first core piece 3f between the end surfaces 311e and 312e during the formation process of the mold resin portion 4. It can be used as a channel for supply.
- the hole portion 34 may be a blind hole as in Embodiment 2 described later with reference to FIGS. 9 and 10 .
- the radius r4 of the fourth inscribed circle C4 and the radius r5 of the fifth inscribed circle C5 are the above-mentioned reference 0.6 times or less of the radius r0 of the inscribed circle C0 is satisfied.
- the fourth inscribed circle C4 is the largest inscribed circle in the outer peripheral contour line of the cross section of the first side core portion 321f.
- the fifth inscribed circle C5 is the largest inscribed circle in the outer peripheral contour line of the cross section of the second side core portion 322f.
- the length of the first side core portion 321f and the second side core portion 322f along the second direction D2 is 0.5 times the length of the first middle core portion 31f along the second direction D2. Double.
- the lengths of the first side core portion 321f and the second side core portion 322f along the third direction D3 are equal to or longer than the length of the first middle core portion 31f along the second direction D2. That is, the radius r4 and the radius r5 are 0.5 times the radius r0.
- the radius r6 of the sixth inscribed circle C6 satisfies 0.6 times or less of the radius r0 of the reference inscribed circle C0 described above.
- the sixth inscribed circle C6 is the largest inscribed circle in the outer contour of the horizontal cross section of the first end core portion 33f.
- the length L3f along the first direction D1 of the first end core portion 33f shown in FIG. 3 is 0.5 times the length along the second direction D2 of the first middle core portion 31f. Therefore, the radius r6 is 0.5 times the radius r0.
- At least one of the first core piece 3f and the second core piece 3s is made of a molded composite material.
- the first core piece 3f and the second core piece 3s may be made of different materials, or may be made of the same material.
- the mutually different materials include, of course, the case where the materials of the individual constituent elements of each core portion are different, and also the case where the contents of a plurality of constituent elements are different even if the individual constituent elements are made of the same material.
- the first core piece 3f and the second core piece 3s are composed of a composite material molded body, if at least one of the soft magnetic powder and the resin constituting the composite material is different, or the soft magnetic Even if the materials of the powder and the resin are the same, if the contents of the soft magnetic powder and the resin are different, the materials are assumed to be different from each other.
- the first core piece 3f is composed of a composite material compact
- the second core piece 3s is composed of a powder compact.
- Composite molded bodies are made by dispersing soft magnetic powder in resin.
- the first core piece 3f which is made of a molded composite material, is manufactured as follows. A core corresponding to the hole 34 described above is placed inside the mold. The raw material for the molded composite material is poured into the mold. The raw material is a fluid material in which soft magnetic powder is dispersed in unsolidified resin. The raw material resin is solidified.
- the soft magnetic particles that make up the soft magnetic powder are soft magnetic metal particles, soft magnetic metal particles coated with an insulating coating on the outer periphery of the soft magnetic metal particles, or soft magnetic non-metal particles.
- Soft magnetic metals are pure iron or iron-based alloys. Iron-based alloys are, for example, Fe—Si alloys or Fe—Ni alloys.
- the insulating coating is, for example, phosphate.
- a soft magnetic non-metal is, for example, ferrite.
- Composite resins are, for example, thermosetting resins and thermoplastic resins.
- Thermosetting resins are, for example, epoxy resins, phenol resins, silicone resins, and urethane resins.
- Thermoplastic resins are, for example, polyphenylene sulfide resins, polyamide resins, liquid crystal polymers, polyimide resins, and fluorine resins.
- Polyamide resins are, for example, nylon 6, nylon 66, and nylon 9T.
- the molded body of the composite material may contain ceramic filler.
- Ceramic fillers are, for example, alumina and silica.
- the content of the soft magnetic powder in the compact of the composite material is, for example, 20% by volume or more and 80% by volume or less.
- the content of the resin in the molded body of the composite material is, for example, 20% by volume or more and 80% by volume or less. These contents are values when the composite material is 100% by volume.
- a compacted body is formed by compression-molding soft magnetic powder. Compared to composite materials, the compacted body can have a high percentage of the soft magnetic powder in the core piece. Therefore, it is easy to improve the magnetic properties of the powder compact. Magnetic properties are, for example, saturation magnetic flux density or relative magnetic permeability.
- the powder compact has a smaller amount of resin and a larger amount of soft magnetic powder than a compact made of composite material, and is therefore excellent in heat dissipation.
- the magnetic powder content in the powder compact is, for example, 85% by volume or more and 99.99% by volume or less. This content is a value when the powder compact is 100% by volume.
- the content of the soft magnetic powder in the powder compact or composite material compact is considered equivalent to the area ratio of the soft magnetic powder in the cross section of the compact.
- the content of the soft magnetic powder in the compact is determined as follows. A cross section of the compact is observed with an SEM (scanning electron microscope) to obtain an observed image. The magnification of the SEM is 200 times or more and 500 times or less. The number of acquired observation images is set to 10 or more. The total cross-sectional area shall be 0.1 cm 2 or more. One observation image may be acquired for one cross section, or a plurality of observation images may be acquired for one cross section. Image processing is performed on each acquired observation image to extract the outline of the particle. Image processing is, for example, binarization processing. The area ratio of the soft magnetic particles is calculated in each observation image, and the average value of the area ratios is obtained. The average value is regarded as the content of the soft magnetic powder.
- the sizes of the first core piece 3f and the size of the second core piece 3s are different from each other. Unlike this embodiment, the size of the first core piece 3f and the size of the second core piece 3s may be the same.
- the length of each core portion of the first core piece 3f along the first direction D1 differs from the length of each core portion of the second core piece 3s along the first direction D1.
- the length L1f of the first middle core portion 31f is longer than the length L1s of the second middle core portion 31s.
- the length L21f of the first side core portion 321f is longer than the length L21s of the first side core portion 321s.
- the length L22f of the second side core portion 322f is longer than the length L22s of the second side core portion 322s.
- the length L3s of the second end core portion 33s is shorter than the length L3f of the first end core portion 33f. Unlike this embodiment, the length L3s and the length L3f may be the same.
- the length L1f of the first middle core portion 31f, the length L21f of the first side core portion 321f, and the length L22f of the second side core portion 322f at least one length may be different. may be the same.
- the length L1s of the second middle core portion 31s, the length L21s of the first side core portion 321s, and the length L22s of the second side core portion 322s at least one length may be different. may be the same.
- the length L21f and the length L22f are the same and longer than the length L1f.
- the length L21s and the length L22s are the same and longer than the length L1s.
- the gap portion 3g is made of a material having a smaller relative magnetic permeability than the first core piece 3f and the second core piece 3s.
- the gap portion 3g is made up of a part of the mold resin portion 4, which will be described later.
- the gap portion 3g may be an air gap.
- the position where the gap portion 3g is arranged may be inside the winding portion 21 as in the present embodiment.
- the gap portion 3g of this embodiment is provided between the first middle core portion 31f and the second middle core portion 31s. Since the gap portion 3g is provided inside the winding portion 21, leakage magnetic flux enters the winding portion 21 and the winding portion 21 is It is easy to reduce the eddy current loss generated in
- the reactor 1 may further have a molded resin portion 4 as shown in FIG. FIG. 3 omits the molded resin portion 4 for convenience of explanation.
- the mold resin portion 4 covers at least part of the magnetic core 3 .
- the molded resin portion 4 protects the covered portion from the external environment.
- the mold resin portion 4 may cover the outer circumference of the magnetic core 3 and may not cover the outer circumference of the coil 2 , or may cover both the outer circumference of the magnetic core 3 and the outer circumference of the coil 2 .
- the mold resin portion 4 of this embodiment covers the outer periphery of the combination of the coil 2 and the magnetic core 3 .
- the molded resin portion 4 protects the assembly from the external environment.
- the coil 2 and the magnetic core 3 are integrated by the molded resin portion 4 .
- the mold resin portion 4 of this embodiment is provided between the coil 2 and the magnetic core 3, between the first middle core portion 31f and the second middle core portion 31s, and inside the hole portion .
- the mold resin portion 4 provided between the first middle core portion 31f and the second middle core portion 31s constitutes the gap portion 3g.
- the resin of the mold resin portion 4 is, for example, the same resin as the resin of the composite material described above.
- the resin of the mold resin portion 4 may contain a ceramic filler, like the composite material.
- the reactor 1 may include at least one of a case, an adhesive layer, and a holding member.
- the case accommodates an assembly of the coil 2 and the magnetic core 3 inside.
- the combined body in the case may be embedded in the sealing resin portion.
- the adhesive layer for example, fixes the assembly to the mounting surface, the assembly to the inner bottom surface of the case, and the case to the mounting surface.
- the holding member is provided between the coil 2 and the magnetic core 3 to ensure insulation between the coil 2 and the magnetic core 3 .
- the first side core portion 321f and the second side core portion 322f also have voids. is difficult to form. Since the radius r6 of the sixth inscribed circle C6 is 0.5 times the radius r0 of the reference inscribed circle C0, voids are less likely to form in the first end core portion 33f as well. Therefore, the first core piece 3f has few or substantially no voids that act as starting points for cracks.
- FIG. 9 and 10 show horizontal cross sections obtained by cutting the first core piece 3f at the same position as the horizontal cross section shown in FIG.
- the reactor of this embodiment differs from the reactor 1 of the first embodiment in that the hole portion 34 is a blind hole. That is, the hole portion 34 has a bottom portion 341 .
- the following description will focus on the differences from the first embodiment. Descriptions of configurations and effects similar to those of the first embodiment may be omitted. These points are the same in the third embodiment described later.
- the hole portion 34 shown in FIG. 9 is provided continuously from the outer surface 33o of the first end core portion 33f to the middle of the first middle core portion 31f. That is, the opening of the hole 34 shown in FIG. 9 is connected to the outer surface 33o.
- the hole portion 34 shown in FIG. 10 is provided from the end surface 311e of the first middle core portion 31f to the middle of the first end core portion 33f. That is, the opening of the hole 34 shown in FIG. 10 is connected to the end surface 311e.
- the length of the hole portion 34 along the first direction D1 is such that at least one of the radius r2 of the second inscribed circle and the radius r3 of the third inscribed circle C3 is 0.00 of the radius r0 of the reference inscribed circle C0 described above. It may be selected to satisfy 6 times or less.
- the second inscribed circle is the largest inscribed circle contacting the first surface and the bottom 341 of the hole 34 in the longitudinal section of the first core piece 3f.
- the third inscribed circle C3 is the largest inscribed circle contacting the first surface and the bottom portion 341 of the hole portion 34 in the horizontal cross section of the first middle core portion 31f shown in FIGS.
- the second inscribed circle is also the same as the third inscribed circle C3 shown in FIGS.
- the first surface is the end surface 311e of the first middle core portion 31f or the outer surface 33o of the first end core portion 33f. In FIG. 9, the first surface is the end surface 311e. In FIG. 10, the first surface is the outer surface 33o.
- both radius r2 and radius r3 may be less than or equal to 0.6 times radius r0.
- the preferred ranges of radius r2 and radius r3 are the same as the preferred range of radius r1.
- FIG. 11 shows a cross section cut through the first core piece 3f at the same position as the cross section shown in FIG.
- FIG. 12 shows a longitudinal section obtained by cutting the first core piece 3f at the same position as the longitudinal section shown in FIG.
- FIG. 13 shows a horizontal cross section obtained by cutting the first core piece 3f at the same position as the horizontal cross section shown in FIG.
- the groove portion 35 has an opening connected to the outer peripheral surface of the first middle core portion 31f in the cross section of the first middle core portion 31f.
- the number of grooves 35, the depth of the grooves 35, and the contour shape of the grooves 35 in the cross section of the first middle core portion 31f are such that the radius r1 of the first inscribed circle C1 is 0.6 times the radius r0 of the reference inscribed circle C0. It can be selected as appropriate so as to satisfy twice or less.
- the first inscribed circle C1 of the present embodiment is the largest inscribed circle between the outline of the outer periphery and the outline of the groove portion 35 in the cross section of the first middle core portion 31f.
- the reference inscribed circle C0 is the largest inscribed circle in the first imaginary outline V1 as described above.
- the first imaginary outline V ⁇ b>1 does not follow the inner surface of the groove 35 and includes a straight line that straddles the opening of the groove 35 .
- the number of grooves 35 may be singular or plural. In this embodiment, the number of grooves 35 is two. In this embodiment, the two groove portions 35 are provided so as to be aligned on the same straight line along the third direction D3 in the cross section of the first middle core portion 31f. These two grooves 35 form an H-shaped cross section of the first middle core portion 31f. Different from the present embodiment, the two grooves 35 may be aligned on the same straight line along the second direction D2 in the cross section of the first middle core portion 31f.
- the depth of the grooves 35 can be appropriately selected according to the number of the grooves 35.
- the depth of the groove 35 is the length from the opening of the groove 35 toward the bottom 351 of the groove 35 shown in FIG.
- the depth of the grooves 35 may not be the depth at which the grooves 35 overlap the center of gravity of the first imaginary outline V1.
- the depth of the grooves 35 may be the depth at which the grooves 35 overlap the center of gravity of the first imaginary outline V1.
- the groove 35 overlapping the center of gravity of the first imaginary outline V1 means that the outline of the groove 35 surrounds the center of gravity of the first imaginary outline V1.
- the contour shape of the groove portion 35 in the cross section of the first middle core portion 31f is, for example, U-shaped.
- the area S1 inside the groove 35 may be 10% or less of the area S2 of the second imaginary outline V2.
- the inner side of the groove portion 35 is a region surrounded by the outline of the groove portion 35 and the second imaginary outer shape V2.
- the area S1 is the total area of the inner side of each groove 35 .
- the preferable range of the inner area S1 of the groove 35 is the same as the preferable range of the inner area S1 of the hole 34 described above.
- the second virtual outline V2 does not follow the inner surface of the groove 35 and includes a straight line that straddles the opening of the groove 35, like the first virtual outline V1.
- the second imaginary outer shape V2 includes a curve extending over the opening of the groove portion 35. As shown in FIG.
- the groove portion 35 extends in the first direction D1 in the first middle core portion 31f.
- the groove portion 35 is provided continuously from the end surface 311e of the first middle core portion 31f to the outer surface 33o of the first end core portion 33f.
- the groove portion 35 of this embodiment is composed of a bottom portion 351, a first side wall portion, and a second side wall portion. The first side wall and the second side wall connect the bottom 351 and the opening.
- the groove portion 35 may be provided from the outer surface 33o to the middle of the first middle core portion 31f.
- the groove part 35 may be provided halfway from the end surface 311e to the first end core part 33f, as in Embodiment 5 described later with reference to FIGS. 17 and 18 .
- the first core piece 3f which is made up of a molded composite material, is manufactured as follows. A protrusion corresponding to the groove portion 35 described above is provided on the inner peripheral surface of the mold. The raw material for the molded composite material is poured into the mold, and the raw material resin is solidified.
- Embodiment 4 The reactor of Embodiment 4 will be described with reference to FIGS. 14 and 15.
- FIG. 14 the reactor of this embodiment differs from the reactor of Embodiment 3 mainly in that the number of grooves 35 is one.
- the following description will focus on the differences from the third embodiment. Descriptions of configurations and effects similar to those of the third embodiment may be omitted. These points are the same in the fifth embodiment described later.
- the groove portion 35 is provided along the third direction D3 of the first middle core portion 31f in a part of the third direction D3. Due to this groove portion 35, the first middle core portion 31f has a U-shaped cross section.
- the depth of the groove 35 is, as shown in FIG. 14, the depth at which the groove 35 overlaps the center of gravity of the first imaginary outline V1.
- the groove portion 35 is provided so that the radius r1 of the first inscribed circle C1 is 0.6 times or less as large as the radius r0 of the reference inscribed circle C0.
- the groove portion 35 is provided continuously from the end surface 311e of the first middle core portion 31f to the outer surface 33o of the first end core portion 33f.
- Embodiment 5 The reactor of Embodiment 5 will be described with reference to FIGS. 16 to 18.
- FIG. The reactor of this embodiment differs from the reactor of Embodiment 3 mainly in that the number of grooves 35 is one, as shown in FIG.
- the groove portion 35 is provided in series over the entire length of the first middle core portion 31f in the third direction D3.
- the first middle core portion 31f is divided into two parts parallel to each other in the second direction D2.
- the cross-sectional shape of the first middle core portion 31f is formed into two parallel I-shapes by the groove portion 35 .
- the groove portion 35 is provided in series from the end surface 311e to the middle of the first end core portion 33f.
- the groove portion 35 is provided so that the radius r1 of the first inscribed circle C1 is 0.6 times or less as large as the radius r0 of the reference inscribed circle C0.
- the groove portion 35 is provided from the end surface 311e of the first middle core portion 31f to the middle of the first end core portion 33f.
- the groove portion 35 of this embodiment is composed of an end portion 352, a first side wall portion, and a second side wall portion shown in FIGS. The first side wall portion and the second side wall portion connect the end portion 352 and the end face 311e.
- the length of the groove portion 35 along the first direction D1 is such that at least one of the second inscribed circle C2 and the third inscribed circle C3 satisfies 0.6 times or less of the radius r0 of the reference inscribed circle C0 described above.
- the second inscribed circle C2 is the largest inscribed circle contacting the first surface and the end portion 352 of the groove portion 35 in the longitudinal section of the first core piece 3f shown in FIG.
- the third inscribed circle C3 is the largest inscribed circle contacting the first surface and the end portion 352 of the groove portion 35 in the horizontal cross section of the first middle core portion 31f shown in FIG.
- the first surface is the end surface 311e of the first middle core portion 31f or the outer surface 33o of the first end core portion 33f.
- the first surface is the outer surface 33o.
- both radius r2 and radius r3 may be less than or equal to 0.6 times radius r0.
- the preferred ranges of radius r2 and radius r3 are the same as the preferred range of radius r1 described above.
- the reactor 1 of Embodiments 1 to 5 can be used for applications that satisfy the following energization conditions.
- the energization conditions are, for example, maximum DC current, average voltage, and operating frequency.
- the maximum direct current is about 100A or more and 1000A or less.
- the average voltage is about 100V or more and 1000V or less.
- the frequency used is about 5 kHz or more and 100 kHz or less.
- the reactor 1 of Embodiments 1 to 5 can be typically used as a component of a converter mounted on a vehicle 1200 shown in FIG. 19, and a component of a power conversion device provided with this converter.
- Vehicle 1200 is an electric vehicle or a hybrid vehicle.
- a vehicle 1200 includes a main battery 1210, a power conversion device 1100, and a motor 1220, as shown in FIG. Power converter 1100 is connected to main battery 1210 .
- Motor 1220 is driven by electric power supplied from main battery 1210 and used for running.
- Motor 1220 is typically a three-phase AC motor.
- Motor 1220 drives wheels 1250 during running, and functions as a generator during regeneration.
- vehicle 1200 includes engine 1300 in addition to motor 1220 .
- an inlet is shown as the charging point of vehicle 1200, but it can be configured with a plug.
- the power converter 1100 has a converter 1110 and an inverter 1120 .
- Converter 1110 is connected to main battery 1210 .
- Inverter 1120 performs mutual conversion between direct current and alternating current.
- Inverter 1120 is connected to converter 1110 .
- Converter 1110 shown in this example boosts the input voltage of main battery 1210 from approximately 200 V to 300 V to approximately 400 V to 700 V and supplies power to inverter 1120 when vehicle 1200 is running.
- converter 1110 steps down the input voltage output from motor 1220 via inverter 1120 to a DC voltage suitable for main battery 1210 to charge main battery 1210 .
- the input voltage is a DC voltage.
- Inverter 1120 converts the direct current boosted by converter 1110 into a predetermined alternating current and supplies power to motor 1220 when vehicle 1200 is running, and converts the alternating current output from motor 1220 into direct current during regeneration and outputs the direct current to converter 1110. is doing.
- the converter 1110 includes a plurality of switching elements 1111, a drive circuit 1112, and a reactor 1115 as shown in FIG.
- a drive circuit 1112 controls the operation of the switching element 1111 .
- the converter 1110 converts the input voltage by repeating ON/OFF. Conversion of the input voltage means stepping up and down in this case.
- a power device such as a field effect transistor or an insulated gate bipolar transistor is used for the switching element 1111 .
- the reactor 1115 has a function of smoothing the change when the current increases or decreases due to the switching operation by using the property of the coil that prevents the change of the current to flow in the circuit.
- the reactor 1 according to any one of Embodiments 1 to 5 is provided as a reactor 1115 . Power converter 1100 and converter 1110 including reactor 1 have stable performance.
- the vehicle 1200 includes a power supply device converter 1150 and an auxiliary power supply converter 1160.
- Power supply device converter 1150 is connected to main battery 1210 .
- Auxiliary power supply converter 1160 is connected to sub-battery 1230 and main battery 1210 serving as power sources for auxiliary equipment 1240 .
- Auxiliary equipment power supply converter 1160 converts the high voltage of main battery 1210 to low voltage.
- Converter 1110 typically performs DC-DC conversion.
- the power supply device converter 1150 and the auxiliary power converter 1160 perform AC-DC conversion. Some power supply converters 1150 perform DC-DC conversion.
- a reactor having the same configuration as the reactor 1 of any one of Embodiments 1 to 5 and having its size and shape changed appropriately can be used as the reactor of power supply device converter 1150 and auxiliary power converter 1160 . Further, the reactor 1 according to any one of the first to fifth embodiments can be used for a converter that converts input power and that only boosts or only steps down.
- a core piece 5 is an E-shaped core piece having a hole, as in the first embodiment described with reference to FIGS. 2 to 6 .
- a core piece for each sample is made by injection molding. Injection molding is a method of producing a core piece by filling a mold with a raw material for a molded composite material under a predetermined pressure and molding. A cylindrical core is placed inside the mold. The length of the core is such that the hole of the obtained core piece becomes a through hole. The diameter of the core is changed as appropriate.
- the hole in the core piece of each sample is a through hole.
- the hole is provided continuously from the end surface of the first middle core portion to the outer surface of the first end core portion.
- the contour shape of the hole of each sample shall be a perfect circle.
- the diameter of the hole of each sample is varied as shown in Table 1 by changing the diameter of the core.
- the first virtual outline is a square.
- the second virtual outline is a square.
- the length of one side of the first virtual outline is 30 mm.
- Table 1 shows the ratio r1/r0 of the radius r1 of the first inscribed circle to the radius r0 of the reference inscribed circle.
- Table 1 shows the ratio (S1/S2) ⁇ 100 of the inner area S1 of the hole to the area S2 of the second virtual outer shape.
- Sample no. 11 to sample no. 16 Sample no. 11 to sample no.
- the 16 core pieces are E-shaped core pieces having grooves, as in the third embodiment described with reference to FIGS. 11 to 13 .
- the core piece for each sample was designated as sample no. Similar to 1, it is produced by injection molding.
- Protrusions are provided on the inner peripheral surface of the mold.
- the number of protrusions shall be two.
- the protrusions are provided so that the end faces of the protrusions face each other.
- the length of each protrusion is such that the groove of the obtained core piece can be continuously provided from the end surface of the first middle core portion to the outer surface of the first end core portion.
- the width and height of each protrusion are changed as appropriate.
- the cross-sectional shape of the first middle core portion in the core piece of each sample is H-shaped.
- the groove portion of the core piece of each sample was provided continuously from the end surface of the first middle core portion to the outer surface of the first end core portion.
- the shape of the groove is U-shaped.
- the width and depth of the groove are varied as shown in Table 2 by changing the width and height of the protrusion.
- the first virtual outline is a square.
- the second virtual outline is a square.
- the length of one side of the first virtual outline is 30 mm.
- Table 2 shows the ratio r1/r0 of the radius r1 of the first inscribed circle to the radius r0 of the reference inscribed circle.
- Table 2 shows the ratio (S1/S2) ⁇ 100 of the area S1 inside the groove to the area S2 of the second imaginary outline.
- Sample no. 17 core pieces are similar to sample no. Manufactured in the same manner as the 16 core pieces.
- Sample No. 2 in Table 2 does not have holes and grooves. 17, “-” is entered in the columns of “groove width”, “groove depth” and “(S1/S2) ⁇ 100”.
- the core pieces of each sample are evaluated for voids and cracks.
- the results are shown in Tables 1 and 2.
- the meanings of A, B, C, and D shown in Tables 1 and 2 are as follows.
- A has neither voids nor cracks.
- B the ratio of the volume of voids to the volume of core pieces is 1% or less, and cracks do not occur.
- C is such that the ratio of the volume of voids to the volume of the core piece is more than 1% and 2% or less, or the ratio of the length of the crack to the length of the cracked portion of the core piece is 10% or less.
- the length is the length in the second direction D2 or the third direction D3 along which the longitudinal direction of the crack is along.
- the ratio of the length of the crack along the second direction D2 to the length of the portion of the core piece where the crack is generated along the second direction D2 is 10% or less.
- the ratio of the void volume to the core piece volume is more than 2%, or the crack length ratio to the length of the cracked portion of the core piece is more than 10%.
- the void volume is a value estimated from the ratio of the measured density of the core piece determined by the Archimedes method to the design density of the core piece.
- the design density refers to the density obtained from the mass and volume of the core piece assuming that neither voids nor cracks have occurred.
- reactor characteristics Using core pieces of each sample, the reactor of Embodiment 1 described with reference to FIG. 1 is constructed. As the reactor characteristics of each sample, changes in inductance are calculated by three-dimensional magnetic field analysis. Commercially available CAE (Computer Aided Engineering) software is used for the analysis. The inductance value of a reactor having core pieces without holes or grooves and without voids and cracks is used as a reference value. The inductance value of each sample is determined, and the degree of reduction in inductance from the reference value of each sample is determined. For the inductance, the amplitude of the energized current is 20A ( ⁇ 20A). The results are shown in Tables 1 and 2.
- A has a degree of reduction of 2% or less.
- B the degree of reduction is more than 2% and 5% or less.
- C the degree of reduction is more than 5% and 10% or less.
- D is greater than 10% reduction.
- Sample No. 1 to sample no. 5 core piece is sample no. Fewer voids and cracks compared to 17 core pieces.
- Sample no. 1 core piece is sample no. The degree of reduction in inductance is as small as that of the 17 core pieces.
- Sample no. 2 to sample no. 4 core pieces have a relatively small reduction in inductance.
- Sample No. 12, sample no. 13, sample no. 15, and sample no. 16 core pieces are sample no. Fewer voids and cracks compared to 17 core pieces.
- Sample no. 12 core pieces, sample no. The degree of reduction in inductance is as small as that of the 17 core pieces.
- Sample no. 13, sample no. 15, and sample no. The 16 core pieces have a relatively small reduction in inductance.
- the second core piece may be composed of a laminate.
- the laminate is formed by laminating a plurality of magnetic thin plates.
- the magnetic thin plate has an insulating coating.
- the magnetic thin plate is, for example, an electromagnetic steel plate.
Abstract
Description
本出願は、2021年03月29日付の日本国出願の特願2021-056130に基づく優先権を主張し、前記日本国出願に記載された全ての記載内容を援用するものである。
複合材料の成形体は、次のようにして製造される。複合材料の成形体の原料を金型内に流す。原料は、未固化の樹脂中に軟磁性粉末を分散した流動性の素材である。原料の樹脂を固化させる。
本開示のコア片は、ボイドが少ない。
最初に本開示の実施態様を列記して説明する。
本開示の実施形態の詳細を、以下に図面を参照しつつ説明する。図中の同一符号は同一名称物を示す。
〔リアクトル〕
図1から図8を参照して、実施形態1のリアクトル1を説明する。リアクトル1は、図1に示すように、コイル2と磁性コア3とを備える。コイル2は、1つの巻回部21を有する。磁性コア3は、第一コア片3fと第二コア片3sとを組み合わせた組物である。本形態のリアクトル1の特徴の一つは、第一コア片3f及び第二コア片3sの少なくとも一方が、図2に示すように、特定の孔部34を有する点にある。以下、各構成を詳細に説明する。図3は、説明の便宜上、コイル2を二点鎖線で示している。
コイル2は、図1、図2に示すように、一つの中空の巻回部21を有する。巻回部21の数が一つであるリアクトル1は、二つの巻回部を巻回部の軸方向と直交する方向に並列するリアクトルに比較して、巻回部21が同じ断面積で同じターン数とする場合、後述する第二方向D2に沿った長さを短くできる。
磁性コア3の構成は、図1に示すように、ミドルコア部31と、第一サイドコア部321及び第二サイドコア部322と、第一エンドコア部33f及び第二エンドコア部33sとを有する。磁性コア3において、巻回部21の軸方向に沿った方向が第一方向D1、ミドルコア部31と第一サイドコア部321と第二サイドコア部322の並列方向が第二方向D2、第一方向D1と第二方向D2の両方に直交する方向が第三方向D3である。
ミドルコア部31は、巻回部21の内部に配置されている部分を有する。ミドルコア部31の形状は、例えば巻回部21の内周形状に対応した形状である。ミドルコア部31の形状は、本形態では図2に示すように四角柱状である。ミドルコア部31の角部は、巻回部21の角部の内周面に沿うように丸めていてもよい。
第一サイドコア部321と第二サイドコア部322とは、図1に示すように、ミドルコア部31を挟むように互いに向き合って配置されている。第一サイドコア部321と第二サイドコア部322とは、巻回部21の外周に配置されている。第一サイドコア部321の形状と第二サイドコア部322の形状は、同一形状であり、本形態では薄い角柱状である。
第一エンドコア部33fは、巻回部21の第一の端面に臨んでいる。第二エンドコア部33sは、巻回部21の第二の端面に臨んでいる。臨んでいるとは、第一エンドコア部33fの内方面33iと巻回部21の第一の端面とが互いに向き合っていることをいう。また、第二エンドコア部33sの内方面と巻回部21の第二の端面とが互いに向き合っていることをいう。本形態では、第一エンドコア部33fの形状と第二エンドコア部33sの形状は、図1、図2に示すように、薄い角柱状である。
第一コア片3fと第二コア片3sの組み合わせは、第一コア片3f及び第二コア片3sの形状を適宜選択することで、種々の組み合わせとすることができる。第一コア片3fの形状と第二コア片3sの形状は、本形態のように非対称であってもよいし、本形態とは異なり対称であってもよい。非対称とは、形状が異なることをいう。対称とは、形状及びサイズが同一であることをいう。
第一コア片3f及び第二コア片3sのうち複合材料の成形体で構成されているコア片は、図4から図8に示すような孔部34を有している。後述するように、本形態では、第一コア片3fの全てが複合材料の成形体で構成されている。第二コア片3sの全てが圧粉成形体で構成されている。即ち、本形態では、第一コア片3fが孔部34を有し、第二コア片3sは孔部34を有していない。
本形態のように第一コア片3fが第一サイドコア部321f及び第二サイドコア部322fを有する場合、第四内接円C4の半径r4及び第五内接円C5の半径r5は、上述した基準内接円C0の半径r0の0.6倍以下を満たす。第四内接円C4は、第一サイドコア部321fの横断面の外周輪郭線における最大の内接円である。第五内接円C5は、第二サイドコア部322fの横断面の外周輪郭線における最大の内接円である。上述したように本形態では、第一サイドコア部321f及び第二サイドコア部322fの第二方向D2に沿った長さは、第一ミドルコア部31fの第二方向D2に沿った長さの0.5倍である。そして、第一サイドコア部321f及び第二サイドコア部322fの第三方向D3に沿った長さは、第一ミドルコア部31fの第二方向D2に沿った長さ以上である。即ち、半径r4及び半径r5は、半径r0の0.5倍である。また、図6に示すように、第六内接円C6の半径r6は、上述した基準内接円C0の半径r0の0.6倍以下を満たす。第六内接円C6は、第一エンドコア部33fの水平断面の外周輪郭における最大の内接円である。図3に示す第一エンドコア部33fの第一方向D1に沿った長さL3fは、第一ミドルコア部31fの第二方向D2に沿った長さの0.5倍である。そのため、半径r6は、半径r0の0.5倍である。
第一コア片3fと第二コア片3sの少なくとも一方は、複合材料の成形体で構成されている。第一コア片3fと第二コア片3sとは、互いに異なる材質で構成されていてもよいし、同じ材質で構成されていてもよい。互いに異なる材質とは、各コア部の個々の構成要素の材質が異なる場合は勿論、個々の構成要素の材質が同じであっても、複数の構成要素の含有量が異なる場合も含む。例えば、第一コア片3fと第二コア片3sとが複合材料の成形体で構成されていても、複合材料を構成する軟磁性粉末と樹脂の少なくとも一方の材質が異なれば、或いは、軟磁性粉末と樹脂の材質が同じであっても軟磁性粉末及び樹脂の含有量が異なれば、互いに異なる材質で構成されているとする。上述したように、本形態では、第一コア片3fは、複合材料の成形体で構成され、第二コア片3sは、圧粉成形体で構成されている。
本形態では、第一コア片3fと第二コア片3sのサイズは、互いに異なる。本形態とは異なり、第一コア片3fと第二コア片3sのサイズは同じであってもよい。
ギャップ部3gは、第一コア片3f及び第二コア片3sよりも比透磁率が小さい材料からなる部材で構成されている。本形態では、ギャップ部3gは、後述するモールド樹脂部4の一部で構成されている。本形態とは異なり、ギャップ部3gは、エアギャップでもよい。ギャップ部3gの配置箇所は、本形態のように巻回部21の内部であってもよい。本形態のギャップ部3gは、第一ミドルコア部31fと第二ミドルコア部31sとの間に設けられている。ギャップ部3gが巻回部21の内部に設けられていることで、巻回部21の外部に設けられている場合に比較して、漏れ磁束が巻回部21に侵入して巻回部21で発生する渦電流損を低減し易い。
リアクトル1は、更に、図1に示すようにモールド樹脂部4を有していてもよい。図3は、説明の便宜上、モールド樹脂部4を省略している。モールド樹脂部4は、磁性コア3の少なくとも一部を覆う。モールド樹脂部4は、覆う箇所を外部環境から保護する。モールド樹脂部4は、磁性コア3の外周を覆い、コイル2の外周を覆っていなくてもよいし、磁性コア3の外周とコイル2の外周の両方を覆っていてもよい。
リアクトル1は、図示は省略しているものの、ケース、接着層、及び保持部材の少なくとも一つを備えていてもよい。ケースは、コイル2と磁性コア3との組合体を内部に収納する。ケース内の上記組合体は、封止樹脂部により埋設されていてもよい。接着層は、例えば、上記組合体を載置面、上記組合体をケースの内底面、上記ケースを載置面に固定する。保持部材は、コイル2と磁性コア3との間に設けられ、コイル2と磁性コア3との間の絶縁を確保する。
本形態のリアクトル1は、振動によって第一コア片3fにクラックが生じ難い。その理由は、次の通りである。第一内接円C1の半径r1が基準内接円C0の半径r0の0.6倍以下を満たす第一ミドルコア部31fは、製造過程における固化が最も速い箇所と固化が最も遅い箇所との固化速度の差が小さい。そのため、第一ミドルコア部31fにはボイドが形成され難い。また、第四内接円C4の半径r4及び第五内接円C5が基準内接円C0の半径r0の0.5倍であるため、第一サイドコア部321f及び第二サイドコア部322fにもボイドが形成され難い。そして、第六内接円C6の半径r6が基準内接円C0の半径r0の0.5倍であるため、第一エンドコア部33fにもボイドが形成され難い。よって、第一コア片3fは、クラックの起点となるボイドが少ない、或いは実質的にない。
〔リアクトル〕
図9及び図10を参照して、実施形態2のリアクトルを説明する。図9及び図10は、図6に示す水平断面と同様の位置で第一コア片3fを切断した水平断面を示す。本形態のリアクトルは、孔部34が止まり穴である点が、実施形態1のリアクトル1と相違する。即ち、孔部34は、底部341を有する。以下の説明は、実施形態1との相違点を中心に行う。実施形態1と同様の構成及び同様の効果の説明は省略することもある。これらの点は、後述する実施形態3でも同様である。
図9に示す孔部34は、第一エンドコア部33fの外方面33oから第一ミドルコア部31fの途中まで一連に設けられている。即ち、図9に示す孔部34の開口部は、外方面33oにつながっている。一方、図10に示す孔部34は、第一ミドルコア部31fの端面311eから第一エンドコア部33fの途中まで設けられている。即ち、図10に示す孔部34の開口部は、端面311eにつながっている。
図11から図13を参照して、実施形態3のリアクトルを説明する。本形態のリアクトルは、主として第一コア片3fが孔部34ではなく溝部35を有する点が、実施形態1のリアクトル1と相違する。図11は、図4に示す横断面と同様の位置で第一コア片3fを切断した横断面を示す。図12は、図5に示す縦断面と同様の位置で第一コア片3fを切断した縦断面を示す。図13は、図6に示す水平断面と同様の位置で第一コア片3fを切断した水平断面を示す。
溝部35は、図11に示すように、第一ミドルコア部31fの横断面において第一ミドルコア部31fの外周面につながる開口部を有する。溝部35の数、溝部35の深さ、及び第一ミドルコア部31fの横断面における溝部35の輪郭形状は、第一内接円C1の半径r1が基準内接円C0の半径r0の0.6倍以下を満たすように適宜選択できる。本形態の第一内接円C1とは、第一ミドルコア部31fの横断面において、外周輪郭線と溝部35の輪郭線とにおける最大の内接円である。基準内接円C0とは、上述の通り第一仮想外形V1における最大の内接円である。第一仮想外形V1は、溝部35の内面に沿うこと無く、溝部35の開口部を跨ぐ直線を含む。
本形態のリアクトルは、実施形態1と同様、第一ミドルコア部31f、第一サイドコア部321f、第二サイドコア部322f、及び第一エンドコア部33fにボイドが形成サれ難いため、振動によって第一コア片3fにクラックが生じ難い。
図14及び図15を参照して、実施形態4のリアクトルを説明する。本形態のリアクトルは、図14に示すように、主として溝部35の数が1つである点が、実施形態3のリアクトルと相違する。以下の説明は、実施形態3との相違点を中心に行う。実施形態3と同様の構成及び同様の効果の説明は省略することもある。これらの点は、後述する実施形態5でも同様である。
溝部35は、図14に示すように、第一ミドルコア部31fの第三方向D3に沿って第三方向D3の一部に設けられている。この溝部35によって、第一ミドルコア部31fの横断面形状はU字状に構成されている。溝部35の深さは、図14に示すように、溝部35が第一仮想外形V1の重心と重なる深さである。本形態でも、溝部35は、第一内接円C1の半径r1が基準内接円C0の半径r0の0.6倍以下を満たすように設けられている。溝部35は、図15に示すように、第一ミドルコア部31fの端面311eから第一エンドコア部33fの外方面33oまで一連に設けられている。
図16から図18を参照して、実施形態5のリアクトルを説明する。本形態のリアクトルは、図16に示すように、主として溝部35の数が1つである点が、実施形態3のリアクトルと相違する。
溝部35は、図16に示すように、第一ミドルコア部31fの第三方向D3の全長にわたって一連に設けられている。第一ミドルコア部31fは、第二方向D2に並列する2つの部分に分割されている。溝部35によって、第一ミドルコア部31fの横断面形状は並列する2つのI字状に構成されている。溝部35は、図17及び図18に示すように端面311eから第一エンドコア部33fの途中まで一連に設けられている。本形態でも、溝部35は、第一内接円C1の半径r1が基準内接円C0の半径r0の0.6倍以下を満たすように設けられている。
〔コンバータ・電力変換装置〕
実施形態1から実施形態5のリアクトル1は、以下の通電条件を満たす用途に利用できる。通電条件は、例えば、最大直流電流、平均電圧、及び使用周波数である。最大直流電流は、100A以上1000A以下程度である。平均電圧は、100V以上1000V以下程度である。使用周波数は、5kHz以上100kHz以下程度である。実施形態1から実施形態5のリアクトル1は、代表的には図19に示す車両1200に載置されるコンバータの構成部品、このコンバータを備える電力変換装置の構成部品に利用できる。車両1200は、電気自動車又はハイブリッド自動車である。
種々のコア片におけるクラック及びボイドの有無、及びリアクトル特性について検討する。
試料No.1から試料No.5のコア片は、図2から図6を参照して説明した実施形態1と同様、孔部を有するE字状のコア片である。各試料のコア片は、射出成形することで作製する。射出成形は、複合材料の成形体の原料を所定の圧力をかけて金型内に充填して成形することでコア片を作製する方法である。金型内には、円柱状の中子を金型の内部に配置する。中子の長さは、得られるコア片の孔部が貫通孔となる長さとする。中子の直径は、適宜変更する。
試料No.11から試料No.16のコア片は、図11から図13を参照して説明した実施形態3と同様、溝部を有するE字状のコア片である。各試料のコア片は、試料No.1と同様、射出成形により作製する。金型の内周面には、突起を設ける。突起の数は2つとする。突起は、突起の端面同士が互いに向かい合うように設ける。各突起の長さは、得られるコア片の溝部が第一ミドルコア部の端面から第一エンドコア部の外方面まで一連に設けられる長さとする。各突起の幅及び高さは、適宜変更する。
試料No.17のコア片は、孔部及び溝部を有さない点を除き、試料No.16のコア片と同様にして作製する。孔部及び溝部を有していないため、表2の試料No.17における「溝部の幅」、「溝部の深さ」、及び「(S1/S2)×100」の欄には、「-」を記載している。
各試料のコア片のボイド及びクラックの有無を評価する。その結果を表1及び表2に示す。表1及び表2に示すA、B、C、及びDの意味は、次の通りである。Aは、ボイド及びクラックの両方が発生していない。Bは、コア片の体積に対するボイドの体積の割合が1%以下、かつクラックが発生していない。Cは、コア片の体積に対するボイドの体積の割合が1%超2%以下、又はコア片のうちクラックが生じた部位の長さに対するクラックの長さの割合が10%以下である。長さとは、第二方向D2又は第三方向D3のうちクラックの長手方向が沿っている方向の長さとする。例えば、クラックが第二方向D2に沿っている場合、コア片のうちクラックが生じた部位の第二方向D2に沿う長さに対するクラックの第二方向D2に沿う長さの割合が10%以下である。Dは、コア片の体積に対するボイドの体積の割合が2%超、又はコア片のうちクラックが生じた部位の長さに対するクラックの長さの割合が10%超である。ボイドの体積は、アルキメデス法によって求めたコア片の測定密度とコア片の設計密度との比から推定する値とする。設計密度は、ボイドもクラックも生じていないと仮定したコア片の質量と体積から求める密度をいう。
各試料のコア片を用いて、図1を参照して説明した実施形態1のリアクトルを構築する。各試料のリアクトル特性として、インダクタンスの変化を3次元磁場解析により計算する。解析には、市販のCAE(Computer Aided Engineering)ソフトを用いる。孔部または溝部がなく、かつボイド及びクラックがないコア片を備えるリアクトルのインダクタンス値を基準値とする。各試料のインダクタンス値を求め、各試料の基準値に対するインダクタンスの低減度合いを求める。インダクタンスは、通電電流の振幅を20A(±20A)とする。その結果を表1及び表2に示す。表1及び表2に示すA、B、C、及びDの意味は、次の通りである。Aは、低減度合いが2%以下である。Bは、低減度合いが2%超5%以下である。Cは、低減度合いが5%超10%以下である。Dは、低減度合いが10%超である。
2 コイル、21 巻回部、21a 第一端部、21b 第二端部
3 磁性コア、3f 第一コア片、3s 第二コア片
31 ミドルコア部
31f 第一ミドルコア部、31s 第二ミドルコア部
311e、312e 端面
321 第一サイドコア部
321f 第一サイドコア部、321s 第一サイドコア部
322 第二サイドコア部
322f 第二サイドコア部、322s 第二サイドコア部
33f 第一エンドコア部、33s 第二エンドコア部
33i 内方面、33o 外方面
34 孔部、341 底部
35 溝部、351 底部、352 端部
3g ギャップ部
4 モールド樹脂部
C0 基準内接円、C1 第一内接円、C2 第二内接円
C3 第三内接円、C4 第四内接円、C5 第五内接円
C6 第六内接円
V1 第一仮想外形、V2 第二仮想外形
D1 第一方向、D2 第二方向、D3 第三方向
L1f、L1s、L11f、L11s、L12f、L12s 長さ
L21f、L21s 長さ、L22f、L22s 長さ
L3f、L3s 長さ、Lg 長さ
1100 電力変換装置、1110 コンバータ
1111 スイッチング素子、1112 駆動回路
1115 リアクトル、1120 インバータ
1150 給電装置用コンバータ、1160 補機電源用コンバータ
1200 車両、1210 メインバッテリ
1220 モータ、1230 サブバッテリ
1240 補機類、1250 車輪、1300 エンジン
Claims (11)
- 樹脂中に軟磁性粉末が分散した複合材料の成形体で構成されているコア片であって、
コイルの内部に配置されるミドルコア部と、
前記コイルの端面に臨むエンドコア部と、を備え、
前記ミドルコア部は、前記コイルの軸方向に延びている孔部又は溝部を有し、
前記ミドルコア部の横断面において、第一内接円の半径は基準内接円の半径の0.6倍以下であり、
前記横断面は、前記コイルの軸方向に直交する平面で前記孔部又は前記溝部を通るように前記ミドルコア部を切断した断面であり、
前記第一内接円は、前記横断面の前記孔部又は前記溝部の輪郭線と前記横断面の前記ミドルコア部の外周輪郭線とにおける最大の内接円であり、
前記基準内接円は、第一仮想外形における最大の内接円であり、
前記第一仮想外形は、前記横断面に外接する最小の四角形である、
コア片。 - 前記横断面における前記孔部又は前記溝部の内側の面積は、第二仮想外形の面積の10%以下であり、
前記第二仮想外形は、前記横断面を包絡する最小の形状である、請求項1に記載のコア片。 - 前記孔部又は前記溝部が、前記第一仮想外形の重心と重なるように設けられている、請求項1又は請求項2に記載のコア片。
- 前記ミドルコア部は、前記孔部を有し、
前記孔部の輪郭形状は、円形状又は角形状である、請求項1から請求項3のいずれか1項に記載のコア片。 - 前記ミドルコア部は、前記溝部を有し、
前記横断面は、H字状、U字状、又は並列する2つのI字状で構成されている、請求項1から請求項3のいずれか1項に記載のコア片。 - 前記孔部又は前記溝部は、前記ミドルコア部の端面から前記エンドコア部の外方面まで一連に設けられている、請求項1から請求項5のいずれか1項に記載のコア片。
- 前記孔部又は前記溝部は、前記ミドルコア部の端面から前記エンドコア部の途中まで、又は前記エンドコア部の外方面から前記ミドルコア部の途中まで一連に設けられており、
前記コア片の縦断面において、第二内接円の半径は前記基準内接円の半径の0.6倍以下であり、
前記縦断面は、前記コア片の側方視方向に直交する面で前記孔部又は前記溝部を通るように前記コア片を切断した断面であり、
前記第二内接円は、前記縦断面において、前記孔部の底部又は前記溝部の端部と前記ミドルコア部の端面とに接する最大の内接円、或いは、前記孔部の底部又は前記溝部の端部と前記エンドコア部の外方面とに接する最大の内接円である、請求項1から請求項5のいずれか1項に記載のコア片。 - 前記孔部又は前記溝部は、前記ミドルコア部の端面から前記エンドコア部の途中まで、又は前記エンドコア部の外方面から前記ミドルコア部の途中まで一連に設けられており、
前記コア片の水平断面において、第三内接円の半径は前記基準内接円の半径の0.6倍以下であり、
前記水平断面は、前記コア片の平面視方向に直交する面で前記孔部又は前記溝部を通るように前記コア片を切断した断面であり、
前記第三内接円は、前記水平断面において、前記孔部の底部又は前記溝部の端部と前記ミドルコア部の端面とに接する最大の内接円、或いは、前記孔部の底部又は前記溝部の端部と前記エンドコア部の外方面とに接する最大の内接円である、請求項1から請求項5、及び請求項7のいずれか1項に記載のコア片。 - コイルと磁性コアとを備えるリアクトルであって、
前記コイルは、1つの巻回部を有し、
前記磁性コアは、第一コア片と第二コア片とを組み合わせた組物であり、
前記第一コア片及び前記第二コア片の少なくとも一方は、請求項1から請求項8のいずれか1項に記載のコア片である、
リアクトル。 - 請求項9に記載のリアクトルを備える、
コンバータ。 - 請求項10に記載のコンバータを備える、
電力変換装置。
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