Abstract: A reactor includes a coil having a winding portion; a magnetic core including an inner core portion and an outer core portion disposed outside the winding portion; a resin cover housing at least a portion of the magnetic core; and an adhesive portion filling a gap between an outer circumferential surface of a housing portion of the magnetic core and an inner circumferential surface of the resin cover bonding the housing portion with the resin cover. The resin cover includes: a flange portion having a surface that comes into contact with an end face of the winding portion and a through hole; an outer cover portion having housing portion housing the outer core portion and an abutting portion that contacts a portion of the flange portion; and a protruding portion that forms the gap between an outer circumferential surface of the outer core portion.

Abstract: Provided is a reactor including: a coil including winding portions; and a magnetic core including inner core portions arranged inside of the winding portions and outer core portions arranged outside of the winding portions. The inner core portions are integrated objects with non-divided structures and include core through holes formed in a direction orthogonal to an axial direction of the winding portions, and openings on one side and openings on another side of the core through holes are both closed by the winding portions.

Abstract: A reactor including: a coil having a winding portion; a magnetic core that is disposed extending inside and outside the winding portion, and is configured to form a closed magnetic circuit; and a resin mold that includes an inner resin disposed between the winding portion and the magnetic core, and does not cover an outer peripheral face of the winding portion.

Abstract: A reactor is provided that can reduce or alleviate stress that can be applied to a magnetic core, and also has excellent manufacturability, and a reactor manufacturing method is also provided. The reactor includes a coil and a magnetic core that includes a plurality of core pieces and a gap member that is interposed between at least one set of core pieces, the magnetic core forming a closed magnetic circuit when the coil becomes excited. At least one gap member is a resin foam gap member that includes, in a contact region that comes into contact with the core pieces, a resin foam portion constituted by resin foam.

Abstract: A reactor including: a coil having a wound portion; a magnetic core that is disposed inside and outside the wound portion and forms a closed magnetic circuit; and a resin mold that includes an inner resin disposed between the wound portion and the magnetic core, and does not cover an outer-peripheral face of the wound portion.

Abstract: Provided is a reactor including a coil provided with two winding portions that are obtained by winding a winding wire such that axes of the winding portions are parallel to each other, and a magnetic core including a rectangular parallelepiped inner core portion disposed in each of the winding portions, and outer core portions that are disposed outside the winding portions and are for linking the inner core portions, in which at least one of two outer corner portions out of four corner portions of each of the inner core portions includes a corner chamfering portion that has been chamfered more than an inner corner portion that is opposite the outer corner portion, the four corner portions facing an inner circumferential surface of the winding portion and the two outer corner portions being disposed on the side of each winding portion that is distant from the other winding portion.

Abstract: A reactor includes a coil including wound portions; and a magnetic core that includes a set of core pieces that engage with each other and is arranged inside and outside of the wound portions. One core piece includes, at an end portion thereof, a recessed portion having a ring-shaped opening edge that is open toward the other core piece. The other core piece includes, at an end portion thereof, a protruding portion that is configured to be fit into the recessed portion. Both of the core pieces include, in the wound portions, ring-shaped contact portions that are provided along the opening edges and at which the core pieces come into surface contact with each other, and gap portions formed by non-contact regions in which the inner peripheral surfaces forming the recessed portions and the outer peripheral surfaces of the protruding portions are not in contact with each other.

Abstract: Provided is a reactor including a coil having a pair of winding portions; and a ring-shaped magnetic core, the magnetic core including: a pair of inner core portions arranged inside of the winding portions; and a pair of outer core portions respectively arranged outside of one end and outside of another end in an axial direction of the winding portions, the reactor including a non-magnetic reinforcing member that is arranged between the pair of winding portions and is coupled to the inner end surfaces of the pair of outer core portions. An axial rigidity of the reinforcing member is 2×107 N/m or more. Here, the axial rigidity is a value obtained by multiplying the cross-sectional area of the reinforcing member perpendicular to the axial direction of the winding portions and the Young's modulus of the reinforcing member, and dividing the result by the length of the reinforcing member.

Abstract: A reactor includes: a coil including a first winding portion and a second winding portion that are formed by winding a wire, the winding portions being disposed side by side; and a magnetic core including a first inner core portion that is disposed on an inner side of the first winding portion, a second inner core portion that is disposed on an inner side of the second winding portion, and outer core portions that are disposed on an outer side of the two winding portions and connect end portions of the two inner core portions. In the coil, a circumferential length of the second winding portion is shorter than a circumferential length of the first winding portion, and the reactor includes a heat dissipation plate that is disposed on at least a portion of an outer circumferential surface of the second winding portion.

Abstract: A reactor includes a coil having a winding portion, and a magnetic core including a core piece having an inner core portion disposed inside the winding portion. The core piece is a compact made of a composite material that contains a magnetic powder and a resin. The reactor further includes: a first projection that is integrated with and projects from an outer peripheral face of the inner core portion, and comes into contact with an inner peripheral face of the winding portion so as to position the winding portion in a diameter direction of the winding portion, and a second projection that is integrated with and projects from the core piece at a position opposing an end face of the winding portion, and comes into contact with the end face of the winding portion so as to position the winding portion in an axial direction thereof.

Abstract: There is provided a composite material containing magnetic powder and a polymeric material including the powder in a dispersion state, wherein a content of the magnetic powder with respect to the whole composite material is more than 50% by volume and 75% by volume or less, a saturation magnetic flux density of the composite material is 0.6 T or more, and a relative magnetic permeability of the composite material is more than 20 and is 35 or less. It is preferable that a density ratio of the magnetic powder should be 0.38 or more and 0.65 or less. The density ratio is set to be an apparent density/a true density. Moreover, it is preferable that the magnetic powder should include a plurality of particles constituted of the same material.

Abstract: Provided is a reactor including: a coil having wound portions; and a magnetic core including core pieces having inner core portions arranged inside of the wound portions. The core pieces are molded bodies of a composite material including a magnetic powder and a resin, and the reactor includes: projections that are integrally molded with and protrude from outer peripheral surfaces of the inner core portions, and that position the wound portions in radial directions by coming into contact with inner peripheral surfaces of the wound portions; and inner resin portions that fill spaces between the inner peripheral surfaces of the wound portions and the outer peripheral surfaces of the inner core portions excluding the projections.

Abstract: A coil includes a first winding portion having a first wire helically wound including at least one strand, and a second winding portion having a second wire helically wound including a plurality of strands electrically connected to the first winding portion and has an axis that is parallel to an axial direction of the first winding portion, wherein the strands included in the second wire are arranged in parallel in an axial direction of the second winding portion, the number of strands included in the second wire is greater than the number of strands included in the first wire, the cross-sectional area of the second wire is equal to or larger than the cross-sectional area of the first wire, and the cross-sectional area of each strand included in the second wire is equal to or smaller than the cross-sectional area of each strand included in the first wire.

Abstract: Provided is a reactor including a coil having a wound portion, and a magnetic core having an inner core portion arranged inside the wound portion and an outer core portion arranged outside the wound portion. The bottom surface portion, which is to be located on an installation side when the reactor is installed, of the outer core portion protrudes below the bottom surface of the inner core portion, the top surface portion on a side opposite to the bottom surface portion of the outer core portion protrudes above the top surface of the inner core portion, and the respective protrusion amounts are 20% or less of the height in a vertical direction of the inner core portion. The outer core portion has a shape that is symmetrical with respect to a center line that divides the inner core portion into an upper portion and a lower portion.

Abstract: A reactor includes: a coil including a first winding portion and a second winding portion formed by winding a winding wire, such that axes of the winding portions are parallel; and a magnetic core including: a first inner core portion arranged in the first winding portion; a second inner core portion arranged in the second winding portion; and outer core portions that are arranged outside of the winding portions and couple both inner core portions. A specification of a constituent material of the first inner core portion and a specification of a constituent material of the second inner core portion are different, and the second inner core portion is configured such that alternating-current loss of the second inner core portion and the second winding portion is smaller than alternating-current loss of the first inner core portion and the first winding portion.

Abstract: A core member capable of favorably meeting required characteristics is provided. A core member according to the present invention is obtained by molding a mixture containing soft magnetic powder and a resin. This core member includes a specific portion including, as a specific surface, at least one of an installation surface facing an object on which the core member is to be installed and an interlinkage surface that is intersected by a magnetic flux excited by a coil, and an opposite surface on a side opposite to the specific surface. The specific portion has a higher density than a region of the opposite surface.

Abstract: A reactor includes a coil having a pair of wound portions that are arranged side-by-side; a magnetic core having inner core portions that are disposed inside the wound portions and outer core portions that are exposed from the wound portions; and gap portions each constituted by a portion of respective insulating members that are disposed between the coil and the magnetic core, the gap portions dividing the outer core portions in a direction in which the wound portions are arranged side-by-side.

Abstract: A reactor includes a coil having a pair of wound portions arranged side-by-side, a magnetic core having inner core portions and outer core portions, and a case that houses an assembly of the coil and the magnetic core. The case includes a bottom plate portion and a side wall portion that opposes outer peripheral surfaces of the outer core portions. The magnetic core is composed of a composite material and is joined to the bottom plate portion and the side wall portion. When a direction in which the wound portions are arranged in a side-by-side arrangement direction, the side wall portion includes a cut-out portion that exposes at least one of an external side surface of one of the wound portions and an external side surface of the other of the wound portions in the side-by-side arrangement direction to the outside of the case.

Abstract: Provided is a reactor in which a resin is sufficiently filled into winding portions. The reactor includes a coil having a first winding portion and a second winding portion and a magnetic core having an inner core portion and an outer core portion. The outer core portion includes a first groove portion and a second groove portion that are open to a coil facing surface opposite to the coil. When viewed from the axial direction of the first winding portion, the opening of the first groove portion is located at a first region between the outer circumferential contour of the first winding portion and the outer circumferential contour of the inner core portion that is disposed inside of the first winding portion. The inner resin portion and the outer resin portion are connected via the first groove portion and the second groove portion.

Abstract: There is provided a composite material containing magnetic powder and a polymeric material including the powder in a dispersion state, wherein a content of the magnetic powder with respect to the whole composite material is more than 50% by volume and 75% by volume or less, a saturation magnetic flux density of the composite material is 0.6 T or more, and a relative magnetic permeability of the composite material is more than 20 and is 35 or less. It is preferable that a density ratio of the magnetic powder should be 0.38 or more and 0.65 or less. The density ratio is set to be an apparent density/a true density. Moreover, it is preferable that the magnetic powder should include a plurality of particles constituted of the same material.