WO2020031832A1 - リアクトル - Google Patents

リアクトル Download PDF

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Publication number
WO2020031832A1
WO2020031832A1 PCT/JP2019/030180 JP2019030180W WO2020031832A1 WO 2020031832 A1 WO2020031832 A1 WO 2020031832A1 JP 2019030180 W JP2019030180 W JP 2019030180W WO 2020031832 A1 WO2020031832 A1 WO 2020031832A1
Authority
WO
WIPO (PCT)
Prior art keywords
core portion
bolt
inner core
head
bolt hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/030180
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
浩平 吉川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to CN201980048519.8A priority Critical patent/CN112449719B/zh
Priority to US17/263,427 priority patent/US11776733B2/en
Publication of WO2020031832A1 publication Critical patent/WO2020031832A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H01F2027/2857—Coil formed from wound foil conductor

Definitions

  • the present disclosure relates to a reactor.
  • This application claims priority based on Japanese Patent Application No. 2018-150908 filed on Aug. 9, 2018, and incorporates all the contents described in the Japanese application.
  • Patent Literature 1 discloses a reactor including a coil having a winding portion formed by winding a winding, and a magnetic core forming a closed magnetic circuit.
  • the magnetic core of this reactor can be divided into an inner core portion arranged inside the winding portion and an outer core portion arranged outside the winding portion.
  • a magnetic core is formed by connecting an inner core portion formed by combining a plurality of independent core portions (core pieces) and a gap member with a core piece forming an outer core portion by a bolt member. are doing.
  • the reactor of the present disclosure is: A magnetic core, comprising a coil having a winding portion, The magnetic core, An inner core portion disposed inside the winding portion, A reactor having an outer core portion disposed outside the winding portion, A bolt connecting the inner core portion and the outer core portion, The bolt is It is composed of a composite material in which soft magnetic powder is dispersed in resin, A shaft portion penetrating the outer core portion, The shaft portion has a tip reaching the inner core portion,
  • Each of the inner core portion and the outer core portion is an integral body having a non-divided structure.
  • FIG. 1 is a perspective view of the reactor according to the first embodiment.
  • FIG. 2 is an exploded perspective view of the reactor of FIG.
  • FIG. 3 is a longitudinal sectional view of the reactor of the first embodiment.
  • FIG. 4 is a partial longitudinal sectional view of an outer core portion of the reactor according to the second embodiment.
  • FIG. 5 is a schematic front view of a head storage section provided in an outer core section of the reactor according to the third embodiment.
  • Patent Document 1 a plurality of core pieces can be connected with high accuracy. Further, since the bolt members connecting the core pieces are arranged so as to penetrate all the core pieces and do not protrude outside the coil, it is possible to suppress an increase in the size of the reactor due to the bolt members. However, with the configuration of Patent Document 1, there is room for improvement in terms of productivity, and there is a possibility that magnetic characteristics may be reduced.
  • the inner core portion is composed of a plurality of core pieces and a gap member, a through hole must be provided in each core piece and the gap member.
  • the work of aligning the core piece and the gap member and the work of making the through holes of the members coincide with each other and penetrating the bolt member are complicated.
  • Patent Literature 1 the bolt member is disposed in a portion that becomes a magnetic path, and the magnetic characteristics of the reactor are not good. This is because the material of the bolt member in Patent Literature 1 is selected in consideration of the strength of tightening by the bolt member, and is not considered to be selected in consideration of the magnetic characteristics of the reactor.
  • the reactor of the present disclosure has excellent magnetic properties and can be manufactured with high productivity by a simple procedure.
  • the reactor according to the embodiment is A magnetic core, comprising a coil having a winding portion, The magnetic core, An inner core portion disposed inside the winding portion, A reactor having an outer core portion disposed outside the winding portion, A bolt connecting the inner core portion and the outer core portion, The bolt is It is composed of a composite material in which soft magnetic powder is dispersed in resin, A shaft portion penetrating the outer core portion, The shaft portion has a tip reaching the inner core portion,
  • Each of the inner core portion and the outer core portion is an integral body having a non-divided structure.
  • both the inner core portion and the outer core portion are an integral body having a non-divided structure, and therefore the number of members that need to be aligned at the time of connection by bolts is two.
  • a magnetic core is formed by annularly connecting a pair of inner cores and a pair of outer cores, when connecting one outer core and one inner core, one outer core and the other are used.
  • a total of four bolts There is a fastening. For each bolting, only one inner core and one outer core need be aligned.
  • the magnetic characteristics required for the reactor are unlikely to decrease. This is because the bolts connecting the inner core portion and the outer core portion are made of a composite material, so that a decrease in magnetic properties required for the magnetic core of the reactor is suppressed.
  • the inner core portion includes a first bolt hole having a predetermined depth extending in an axial direction of the inner core portion from an end surface thereof
  • the outer core portion includes a second bolt hole extending coaxially with the first bolt hole and penetrating the outer core portion,
  • the inner peripheral surface of the first bolt hole may be provided with a female screw portion corresponding to a male screw portion of the bolt.
  • the tip of the bolt is securely screwed to the inner core portion, so that the inner core portion and the outer core portion can be firmly fixed.
  • the first bolt hole extends from the end surface of the inner core portion along the axial direction of the inner core portion, the first bolt hole extends during the production and use of the reactor as compared with the case where the first bolt hole extends in a direction inclined with respect to the axial direction. Damage of the inner core portion can be suppressed. This is because the thickness from the inner peripheral surface of the first bolt hole to the peripheral surface of the inner core portion becomes uniform along the axial direction of the inner core portion, and the portion where the thickness is locally reduced is eliminated.
  • the inner diameter of the second bolt hole may be uniform in the axial direction of the second bolt hole.
  • a female screw portion corresponding to the male screw portion of the bolt may be formed in the second bolt hole, but it is preferable that the second bolt hole is a simple through hole as shown in the above configuration.
  • a simple through-hole can be easily formed in the outer core portion.
  • a second bolt hole can be formed by drilling the outer core portion, or the second bolt hole can be formed by a mold for molding the outer core portion.
  • the depth of the first bolt hole may be 0.1 to 0.2 times the axial length of the inner core portion.
  • the depth of the first bolt hole By setting the depth of the first bolt hole to be 0.1 times or more the axial length, a sufficient connection strength between the bolt and the inner core portion can be secured. Further, by setting the depth of the first bolt hole to 0.2 times or less the axial length, the inner core portion is less likely to be damaged by processing when forming the first bolt hole, and This can suppress a decrease in strength of the inner core portion due to the above.
  • the bolt includes a shaft portion having a male screw portion, and a head portion formed at one end of the shaft portion, A mode in which the resin contained in the head portion is fused to the outer core portion can be given.
  • the head portion of the bolt is fused to the outer core portion, the head portion can hardly be rotated, so that the bolt is not easily loosened.
  • the bolt includes a shaft portion having a male screw portion, and a head portion formed at one end of the shaft portion,
  • the outer core portion includes a concave head storage portion,
  • the head storage portion is formed around an opening of the second bolt hole opposite to the inner core portion, A mode in which at least a part of the head portion of the bolt is housed inside the head housing portion may be mentioned.
  • the head storage portion has a non-circular shape when viewed from the axial direction of the second bolt hole, and the molten head portion is deformed along an inner wall surface of the head storage portion. Can be mentioned.
  • the inner wall surface of the head storage portion can be a physical detent of the head portion.
  • the inner core may be formed of a composite material in which soft magnetic powder is dispersed in a resin.
  • the composite material contains a resin, it has better workability than a green compact formed by pressing soft magnetic powder. Since the tip of the bolt is screwed to the inner core, it is preferable to form the inner core with a composite material having excellent workability.
  • both the inner core portion and the outer core portion are integrally formed, there is only room for the gap member to be interposed between the inner core portion and the outer core portion, and the magnetic properties of the entire reactor are adjusted. hard.
  • the inner core portion by configuring at least the inner core portion with a composite material, it becomes easy to adjust the magnetic characteristics of the entire reactor. This is because the magnetic properties of the composite material can be easily adjusted by adjusting the content of the soft magnetic powder.
  • the outer core portion may be in the form of a compact formed of a soft magnetic powder.
  • the green compact is easy to increase the content of the soft magnetic powder, and by increasing the content, it is easy to increase the saturation magnetic flux density and the relative magnetic permeability of the green compact.
  • the inner core portion is made of a composite material and the outer core portion is made of a powder compact, a reactor having extremely excellent magnetic properties can be obtained.
  • the reactor 1 shown in FIG. 1 is configured by combining a coil 2, a magnetic core 3, and a holding member 4.
  • the magnetic core 3 includes an inner core part 31 and an outer core part 32.
  • One of the features of this reactor 1 is that the inner core portion 31 and the outer core portion 32 are each an integral body having a non-divided structure, and the inner core portion 31 and the outer core portion 32 are connected by a composite material bolt 5. It is mentioned that.
  • each component included in the reactor 1 will be described in detail.
  • the coil 2 of the present embodiment includes a pair of winding portions 2A and 2B and a connecting portion 2R that connects the two winding portions 2A and 2B.
  • Each of the winding portions 2A and 2B is formed in a hollow cylindrical shape with the same number of turns and the same winding direction, and is arranged in parallel so that each axial direction is parallel.
  • the coil 2 is manufactured by connecting the winding portions 2A and 2B manufactured by the separate windings 2w.
  • the coil 2 can be manufactured by one winding 2w.
  • Each winding part 2A, 2B of this embodiment is formed in the shape of a square tube.
  • the rectangular cylindrical winding portions 2A and 2B are winding portions whose end surfaces are square (including square) and have rounded corners.
  • the winding parts 2A and 2B may be formed in a cylindrical shape.
  • the cylindrical winding part is a winding part whose end surface shape is a closed curved surface shape (an elliptical shape, a perfect circle shape, a race track shape, etc.).
  • the coil 2 including the winding portions 2A and 2B is a covered wire having an insulating coating made of an insulating material on the outer periphery of a conductor such as a flat wire or a round wire made of a conductive material such as copper, aluminum, magnesium, or an alloy thereof.
  • a conductor such as a flat wire or a round wire made of a conductive material such as copper, aluminum, magnesium, or an alloy thereof.
  • a conductor such as a flat wire or a round wire made of a conductive material such as copper, aluminum, magnesium, or an alloy thereof.
  • a conductive material such as copper, aluminum, magnesium, or an alloy thereof.
  • Both ends 2a and 2b of the coil 2 are extended from the winding parts 2A and 2B and connected to a terminal member (not shown).
  • the insulating coating such as enamel is peeled off at both ends 2a and 2b.
  • An external device such as a power supply for supplying power to the coil 2 is connected through the terminal members.
  • the magnetic core 3 includes inner core portions 31, 31 disposed inside the winding portions 2 ⁇ / b> A and 2 ⁇ / b> B, and outer core portions 32, 32 forming closed magnetic paths with the inner core portions 31, 31, respectively. , Is provided.
  • the magnetic core 3 of this example has a gapless structure in which no gap member is arranged between the inner core portion 31 and the outer core portion 32, but may have a structure including a gap member.
  • the inner core portion 31 is a portion of the magnetic core 3 along the axial direction of the winding portions 2A and 2B of the coil 2.
  • both ends of portions of the magnetic core 3 along the axial direction of the winding portions 2A and 2B protrude from the end surfaces of the winding portions 2A and 2B (FIG. 3).
  • the protruding part is also a part of the inner core part 31. Ends of the inner core portion 31 protruding from the winding portions 2A and 2B are inserted into through holes 40 (FIGS. 2 and 3) of the holding member 4 described later.
  • the shape of the inner core portion 31 is not particularly limited as long as the shape conforms to the internal shape of the winding portion 2A (2B).
  • the inner core portion 31 of the present example has a substantially rectangular parallelepiped shape as shown in FIG.
  • the inner core portion 31 is an integral body having a non-divided structure, which is one of the factors that facilitate the assembly of the reactor 1.
  • Axial end surface 31e of inner core portion 31 is in contact with inner surface 32e of outer core portion 32 described later (FIG. 3).
  • An adhesive may be interposed between the end face 31e and the inner face 32e, but may be omitted. This is because the inner core portion 31 and the outer core portion 32 are mechanically connected by bolts 5 as described later.
  • a peripheral surface 31 s excluding the end surface 31 e is opposed to the inner peripheral surfaces of the winding portions 2 ⁇ / b> A and 2 ⁇ / b> B, but does not contact with the inner peripheral surface. It is held at a position away from the camera. This is because the inner core portion 31 and the winding portions 2A and 2B are both mechanically engaged with the holding member 4 described later, and the relative positions of the inner core portion 31 and the winding portions 2A and 2B are determined. Because it is.
  • the inner core portion 31 of this example further includes a first bolt hole h1, and a female screw portion 3f corresponding to a male screw portion 5m of a bolt 5 described later is provided on an inner peripheral surface of the first bolt hole h1.
  • a bolt 5 described later is screw-connected to the first bolt hole h1, and the inner core portion 31 and the outer core portion 32 are mechanically connected by the screw connection.
  • the first bolt hole h1 of this example is a bottomed hole (non-through hole) having a predetermined depth extending from the end surface 31e of the inner core portion 31 along the axial direction of the inner core portion 31. Since the first bolt hole h1 extends along the axial direction, the thickness from the inner peripheral surface of the first bolt hole h1 to the peripheral surface 31s of the inner core portion 31 is uniform along the axial direction of the inner core portion 31. become. As a result, the portion where the thickness is locally reduced is eliminated, so that damage to the inner core portion 31 during manufacturing or use of the reactor 1 can be suppressed. Unlike the present example, the first bolt hole h1 may be inclined with respect to the axial direction of the inner core portion 31.
  • the depth of the first bolt hole h1 is 0.1 to 0.2 times the axial length of the inner core portion 31.
  • the depth of the first bolt hole h1 is 0.1 times or more the axial length of the inner core portion 31, the connection strength between the bolt 5 and the inner core portion 31 can be sufficiently ensured.
  • the depth of the first bolt hole h1 is equal to or less than 0.2 times the axial length of the inner core portion 31, the inner core portion 31 is damaged by the processing at the time of forming the first bolt hole h1. It is difficult to reduce the strength of the inner core portion 31 due to the first bolt hole h1.
  • the first bolt hole h1 can be formed by forming a cylindrical hole having a uniform inner diameter (a so-called simply hole) and then threading the inner peripheral surface of the stuck hole.
  • the strange hole can be formed when the inner core portion 31 is formed.
  • a core is arranged at a position corresponding to the end face 31e of the inner core portion 31 in a mold for manufacturing the inner core portion 31, and the inner core portion 31 is molded.
  • a tiny hole is formed at the position where the core was located.
  • the strange hole can also be formed by processing. In this case, after the inner core portion 31 is formed, the end face 31e can be formed with a drill or the like to form a harmless hole.
  • the female screw portion 3f can be formed by processing the inner peripheral surface of the wrong hole with a tap or the like.
  • the first bolt hole h1 can be formed by using an externally threaded core. In this case, the first bolt hole h1 having the female screw portion 3f is formed by removing the core from the inner core portion 31 while rotating the core.
  • the outer core portion 32 is a portion of the magnetic core 3 that is arranged outside the winding portions 2A and 2B (FIG. 1).
  • the shape of the outer core portion 32 is not particularly limited as long as the shape connects the ends of the pair of inner core portions 31.
  • the outer core portion 32 of the present example is a rectangular parallelepiped block, but may have a substantially dome shape or a U shape when viewed from above.
  • the outer core portion 32 is an integral body having a non-split structure, which is one of the factors that facilitate the assembly of the reactor 1.
  • the outer core portion 32 includes an inner surface 32e facing the end surfaces of the winding portions 2A and 2B of the coil 2, an outer surface 32o opposite to the inner surface 32e, and a peripheral surface 32s.
  • the inner surface 32e and the outer surface 32o are flat surfaces parallel to each other.
  • the upper surface and the lower surface of the peripheral surface 32s are flat surfaces parallel to each other and orthogonal to the inner surface 32e and the outer surface 32o.
  • two side surfaces are also flat surfaces parallel to each other and orthogonal to the inner surface 32e and the outer surface 32o.
  • the outer core portion 32 of the present example further includes a second bolt hole h2 extending coaxially with the first bolt hole h1 and penetrating the outer core portion 32.
  • the second bolt hole h2 can be formed in the same manner as the first bolt hole h1.
  • the inside diameter of the second bolt hole h2 of the present example is a through hole uniform in the axial direction of the second bolt hole h2, that is, a so-called tiny hole. That is, the female screw portion 3f is not formed on the inner peripheral surface of the second bolt hole h2. It is preferable that the inner diameter of the second bolt hole h2 be larger than the outer diameter (peak diameter) of the bolt 5 in consideration of the insertability of the bolt 5. It is preferable that the size be 0.1 mm or more and 0.2 mm or less.
  • a female screw portion may be formed on the inner peripheral surface of the second bolt hole h2.
  • the method of forming the female screw portion in the second bolt hole h2 is the same as that of the first bolt hole h1.
  • the inner core portion 31 and the outer core portion 32 are formed of a green compact formed by pressing a raw material powder containing a soft magnetic powder or a composite body formed by dispersing a soft magnetic powder in a resin. be able to.
  • the core portions 31 and 32 may be a hybrid core in which the outer periphery of the green compact is covered with a composite material.
  • the core portions 31 and 32 may be formed of a composite material in which a gap plate such as alumina is embedded, or may be a mold core in which a core piece and a gap plate are connected and the outer periphery thereof is covered with a resin. May be.
  • a green compact can be produced by filling a raw material powder in a mold and pressing the mold. Due to the production method, the content of the soft magnetic powder is easily increased in the green compact.
  • the content of the soft magnetic powder in the green compact may be more than 80% by volume, and may be 85% by volume or more. Therefore, in the case of a green compact, it is easy to obtain the core portions 31 and 32 having a high saturation magnetic flux density and a high relative magnetic permeability.
  • the relative permeability of the green compact may be 50 or more and 500 or less, and more preferably 200 or more and 500 or less.
  • the soft magnetic powder of the green compact is an aggregate of soft magnetic particles composed of an iron group metal such as iron or an alloy thereof (Fe—Si alloy, Fe—Ni alloy, etc.).
  • An insulating coating made of phosphate or the like may be formed on the surface of the soft magnetic particles.
  • the raw material powder may contain a lubricant or the like.
  • a molded body of a composite material can be produced by filling a mold with a mixture of soft magnetic powder and unsolidified resin and solidifying the resin.
  • the content of the soft magnetic powder is easily adjusted in the composite material.
  • the content of the soft magnetic powder in the composite material can be 30% by volume or more and 80% by volume or less.
  • the content of the magnetic powder is preferably set to 50% by volume or more, 60% by volume or more, and 70% by volume or more.
  • the content of the magnetic powder is preferably set to 75% by volume or less.
  • the relative permeability is easily reduced by adjusting the filling rate of the soft magnetic powder to a low level.
  • the relative magnetic permeability of the molded body of the composite material can be 5 or more and 50 or less, and more preferably 20 or more and 50 or less.
  • the soft magnetic powder of the composite material the same powder as that used for the green compact can be used.
  • the resin contained in the composite material include a thermosetting resin, a thermoplastic resin, a room temperature curable resin, a low temperature curable resin, and the like.
  • the thermosetting resin include an unsaturated polyester resin, an epoxy resin, a urethane resin, and a silicone resin.
  • the thermoplastic resin include polyphenylene sulfide resin, polytetrafluoroethylene resin, liquid crystal polymer, polyamide resin such as nylon 6 and nylon 66, polybutylene terephthalate resin, and acrylonitrile / butadiene / styrene resin.
  • BMC Bit molding compound in which calcium carbonate or glass fiber is mixed with unsaturated polyester, millable silicone rubber, millable urethane rubber, and the like can also be used.
  • a non-magnetic and non-metallic powder such as alumina or silica in addition to the soft magnetic powder and the resin, the heat dissipation can be further improved.
  • the content of the nonmagnetic and nonmetallic powder may be 0.2% by mass or more and 20% by mass or less, further 0.3% by mass or more and 15% by mass or less, and 0.5% by mass or more and 10% by mass or less. .
  • the holding member 4 shown in FIGS. 2 and 3 is interposed between the end faces of the winding portions 2A and 2B of the coil 2 and the inner surface 32e of the outer core portion 32 of the magnetic core 3, and the shafts of the winding portions 2A and 2B. It is a member that holds the end face in the direction and the outer core portion 32.
  • the holding member 4 is typically made of an insulating material such as polyphenylene sulfide resin.
  • the holding member 4 functions as an insulating member between the coil 2 and the magnetic core 3 and a positioning member for positioning the inner core portion 31 and the outer core portion 32 with respect to the winding portions 2A and 2B.
  • the two holding members 4 of the present example have the same shape. Therefore, the mold for manufacturing the holding member 4 can be shared, and the productivity of the holding member 4 is excellent.
  • the holding member 4 can be omitted.
  • the holding member 4 includes a pair of through holes 40, a pair of core support portions 41, a pair of coil storage portions 42, and a single core storage portion 43.
  • the through hole 40 penetrates in the thickness direction of the holding member 4, and the end of the inner core portion 31 is inserted into the through hole 40.
  • the core support portion 41 is a tubular piece that protrudes from the inner peripheral surface of each through hole 40 toward the inner core portion 31 and supports the inner core portion 31.
  • the coil accommodating portion 42 (FIG. 2) is a recess along the end surface of each of the winding portions 2A and 2B, is formed so as to surround the core support portion 41, and the end surface and the vicinity thereof are fitted.
  • the core housing portion 43 is formed by recessing a part of the surface of the holding member 4 on the side of the outer core portion 32 in the thickness direction, and the inner surface 32e of the outer core portion 32 and the vicinity thereof are fitted.
  • the end surface 31e of the inner core portion 31 fitted into the through hole 40 of the holding member 4 projects from the bottom surface of the core storage portion 43 (FIG. 3). Therefore, the end surface 31 e of the inner core portion 31 and the inner surface 32 e of the outer core portion 32 abut.
  • the lower piece facing the installation surface such as the cooling base is notched.
  • the lower surface of the outer core portion 32 fitted into the core storage portion 43 of the holding member 4 is substantially flush with the lower end surface of the holding member 4. According to this configuration, since the magnetic path cross-sectional area of the outer core portion 32 can be increased without increasing the thickness of the outer core portion 32 in the axial direction of the winding portions 2A and 2B, the reactor 1 can be downsized. Further, the lower surface of the outer core portion 32 can be brought into contact with an installation surface such as a cooling base, so that the heat radiation of the reactor 1 can be improved.
  • the bolt 5 is a member that penetrates the outer core portion 32 and connects the inner core portion 31 and the outer core portion 32 when the tip reaches the inner core portion 31.
  • the bolt 5 includes a head part 50 and a shaft part 51, and a male screw part 5 m is formed on the tip side of the shaft part 51.
  • the male screw portion 5m is screw-coupled to the female screw portion 3f formed in the first bolt hole h1 of the inner core portion 31, and the bolt 5 and the inner core portion 31 are firmly connected.
  • the outer core portion 32 is sandwiched between the head portion 50 of the bolt 5 and the end surface 31e of the inner core portion 31 so as not to fall off from the inner core portion 31.
  • the inner core portion 31 and the outer core portion 32 can be directly connected without any additional configuration other than the bolt 5.
  • the bolt 5 is formed of a molded body of a composite material.
  • the composition of the composite material forming the bolt 5 can be appropriately selected.
  • the composition of the composite material forming the bolt 5 may be the same as or different from the composition of the composite material forming the inner core 31. May be.
  • the resin content of the bolt 5 can be made larger than the resin content of the inner core portion 31 in consideration of the workability of the bolt 5.
  • the content of the soft magnetic powder of the bolt 5 does not become too low in order to suppress a decrease in the magnetic properties of the bolt 5.
  • the resin content of the bolt 5 is set to 50% by volume or more and 60% by volume or less, and the content of the soft magnetic powder is set to 40% by volume or more and 50% by volume or less.
  • the resin content of the bolt 5 may be smaller than the resin content of the inner core portion 31 in consideration of the magnetic characteristics of the bolt 5. That is, this configuration is such that the content of the soft magnetic powder of the bolt 5 is larger than the content of the soft magnetic powder of the inner core portion 31. Since the bolt 5 is located at the center of the magnetic path in the inner core portion 31, the magnetic characteristics of the magnetic core 3 can be improved by improving the magnetic characteristics of the bolt 5.
  • the resin content of the bolt 5 may be 30% by volume or more and 40% by volume or less, and the content of the soft magnetic powder may be 60% by volume or more and 70% by volume or less.
  • the reactor 1 of this example can be used as a component of a power conversion device such as a bidirectional DC-DC converter mounted on an electric vehicle such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle.
  • the reactor 1 of the present example can be used in a state where it is immersed in a liquid refrigerant.
  • the liquid refrigerant is not particularly limited, but when the reactor 1 is used in a hybrid vehicle, ATF (Automatic Transmission Fluid) or the like can be used as the liquid refrigerant.
  • fluorinated inert liquids such as Fluorinert (registered trademark), chlorofluorocarbon-based refrigerants such as HCFC-123 and HFC-134a, alcohol-based refrigerants such as methanol and alcohol, and ketone-based refrigerants such as acetone are used as liquid refrigerants. You can also.
  • fluorinated inert liquids such as Fluorinert (registered trademark), chlorofluorocarbon-based refrigerants such as HCFC-123 and HFC-134a, alcohol-based refrigerants such as methanol and alcohol, and ketone-based refrigerants such as acetone are used as liquid refrigerants. You can also.
  • a cooling medium such as a liquid refrigerant, the winding parts 2A and 2B are brought into direct contact with the cooling medium. Therefore, the reactor 1 of the present example is excellent in heat dissipation.
  • the reactor 1 of this example can be manufactured with a simple procedure with high productivity. This is because the relative positions of the inner core portion 31 and the outer core portion 32 can be determined only by mechanical engagement with the bolt 5. In addition, the fact that both the inner core portion 31 and the outer core portion 32 are of an undivided structure is one of the factors that can improve the productivity of the reactor 1.
  • the inner core portion 31 and the outer core portion 32, which are integrated, are easy to handle, and the members that need to be aligned when connecting the inner core portion 31 and the outer core portion 32 are the inner core portion 31 and the outer core portion 32. This is because only two are required.
  • the reactor 1 of the embodiment may be molded with resin after the connection between the inner core portion 31 and the outer core portion 32, or may be embedded in a case with potting resin.
  • the magnetic properties required for the reactor 1 are unlikely to deteriorate. This is because, since the bolt 5 connecting the inner core portion 31 and the outer core portion 32 is made of a composite material, a decrease in magnetic properties required for the magnetic core 3 of the reactor 1 is suppressed.
  • FIG. 4 is a partial longitudinal sectional view of the reactor 1 in which the outer core portion 32 has been longitudinally cut at the position of the second bolt hole h2.
  • the head storage section 320 is formed in the outer core section 32.
  • the head housing portion 320 is a depression formed around the opening of the second bolt hole h2 on the side opposite to the inner core portion 31, that is, a depression formed around the second bolt hole h2 on the outer surface 32o.
  • the shape of the head storage section 320 as viewed from the axial direction of the second bolt hole h2 is circular.
  • the head portion 50 is melted.
  • the resin forming the bolt 5 is a thermoplastic resin.
  • the melted head portion 50 spreads over substantially the entirety of the head storage portion 320, deforms into a substantially dome shape, and solidifies.
  • the head portion 50 is fused to the outer core portion 32 (in this example, an inner wall surface of a head storage portion 320 described later). Since the head portion 50 fused to the outer core portion 32 does not easily rotate, loosening of the bolt 5 is effectively suppressed.
  • the temperature of the shaft portion 51 and the outer core portion 32 other than the head portion 50 is not excessively high.
  • a method in which a heater is pressed only on the head unit 50 to melt the resin contained in the head unit 50 can be mentioned.
  • the depth of the head storage section 320 in this example is smaller than the thickness of the head section 50 (the length along the axial direction of the bolt 5). Further, in the present example, the volume of the head storage section 320 is smaller than the volume of the head section 50, and a part of the head section 50 is stored in the head storage section 320. According to such a configuration, the amount of protrusion of the head portion 50 from the outer surface 32o of the outer core portion 32 can be reduced. If the amount of protrusion is small, the hand or tool of the operator will not easily hit the head unit 50 when transporting the reactor 1 or installing the reactor 1 on an installation target. Therefore, the rotation of the head part 50 can be suppressed, and the bolt 5 is not easily loosened. Further, according to this configuration, when the head portion 50 is melted, the heater does not easily come into contact with the outer surface 32o. Therefore, it is possible to suppress a problem that the outer core portion 32 is melted by the heater.
  • the depth of the head storage section 320 may be greater than the thickness of the head section 50. By doing so, the volume of the head storage section 320 becomes larger than the volume of the head section 50. In this case, the entire head unit 50 is stored in the head storage unit 320 by melting the head unit 50. As a result, the melted and deformed head portion 50 does not protrude from the outer surface 32o of the outer core portion 32, so that the rotation of the head portion 50 can be more reliably suppressed, and the increase in the outer dimensions of the reactor due to the bolt 5 is suppressed. it can.
  • the depth of the head storage section 320 may be adjusted so that the volume of the head storage section 320 is equal to the volume of the head section 50.
  • the entire area of the head storage section 320 is filled with the melted and deformed head section 50, and a large step is not formed between the head section 50 and the outer surface 32 o of the outer core section 32. For this reason, it is possible to prevent the outer core portion 32 from being damaged by a worker's hand or tool being caught on the step.
  • the head storage section 320 can be formed regardless of whether the head section 50 is fused to the outer core section 32 or not. However, as in this example, it is preferable to form the head storage section 320 and fuse the head section 50 along the inner wall surface of the head storage section 320. By doing so, the fusion area between the head portion 50 and the outer core portion 32 can be increased as compared with the case where the head storage portion 320 is not provided.
  • FIG. 5 is a view of the outer core portion 32 viewed from the outer surface 32o side.
  • the shape of the head housing portion 320 formed on the outer surface 32o as viewed from the axial direction of the second bolt hole h2 is a non-circular shape.
  • the outline shape of the opening of the head storage section 320 in this example is a regular hexagon, but the outline shape may be a polygon or an ellipse.
  • the diameter of the circle inscribed in the opening of the head storage section 320 is larger than the diameter of the circle circumscribed on the outer contour of the head section 50. By doing so, the head unit 50 can be rotated when the bolt 5 is tightened.
  • the resin of the head unit 50 is melted similarly to the second embodiment.
  • the melted head portion 50 spreads over the entire head storage portion 320 and deforms along the inner wall surface of the head storage portion 320.
  • the inner wall surface serves as a physical stopper for the head unit 50, and the rotation of the head unit 50 is effectively suppressed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
PCT/JP2019/030180 2018-08-09 2019-08-01 リアクトル Ceased WO2020031832A1 (ja)

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US17/263,427 US11776733B2 (en) 2018-08-09 2019-08-01 Reactor including a magnetic core

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JP7371423B2 (ja) * 2019-09-30 2023-10-31 株式会社村田製作所 コイル部品
FR3152633A1 (fr) * 2023-08-31 2025-03-07 Safran Noyau magnetique a fermeture optimisee

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS6120007U (ja) * 1984-07-10 1986-02-05 東北金属工業株式会社 チヨ−クコイル用磁気コア
WO2010026690A1 (ja) * 2008-09-05 2010-03-11 三菱電機株式会社 Ｄｃ／ｄｃコンバータ用シートトランス
JP3195212U (ja) * 2014-10-22 2015-01-08 スミダコーポレーション株式会社 リアクトル

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JP2004039847A (ja) * 2002-07-03 2004-02-05 Iq Four:Kk 高周波磁気漏洩変圧器
JP5096705B2 (ja) * 2006-07-24 2012-12-12 株式会社日立産機システム クローティース型同期機
JP5465151B2 (ja) * 2010-04-23 2014-04-09 住友電装株式会社 リアクトル
CN205692660U (zh) * 2016-03-31 2016-11-16 湖南谦益电子科技有限公司 一种新型铁氧体磁芯
CN205692667U (zh) * 2016-03-31 2016-11-16 湖南谦益电子科技有限公司 一种多层组合式铁氧体磁芯

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS6120007U (ja) * 1984-07-10 1986-02-05 東北金属工業株式会社 チヨ−クコイル用磁気コア
WO2010026690A1 (ja) * 2008-09-05 2010-03-11 三菱電機株式会社 Ｄｃ／ｄｃコンバータ用シートトランス
JP3195212U (ja) * 2014-10-22 2015-01-08 スミダコーポレーション株式会社 リアクトル

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CN112449719A (zh) 2021-03-05
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CN112449719B (zh) 2022-07-19
JP7089222B2 (ja) 2022-06-22

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