Abstract: The present invention provides a current transformer module that can achieve downsizing and keeping the creepage distance of insulation simultaneously. The current transformer module 12 according to the present invention comprises a current transformer 10 and a casing 80 for housing the current transformer, wherein the current transformer includes a resin-made bobbin 20 with a through hollow section 21 and a core 30 having legs 42 inserted at least into the hollow section, the bobbin having a primary coil 26 and a wire-wound secondary coil 27 on the outer periphery of the hollow section, wherein the bobbin has insulation walls 22, 24 between the primary coil and the secondary coil wherein the insulation wall has recesses 23,25, and wherein the casing are provided with protrusions 83, 87 adapted to fit into the recesses.

Abstract: The present invention provides a current transformer having excellent temperature characteristics and realizing high-precision adjustment of the output voltage via gap adjustment and small tolerance, and a method for manufacturing the same. The core component for current transformers of the present invention, comprises an E-type core 40 formed of an electromagnetic steel sheet and having three legs 41, 42, 41 extending substantially parallel to each other and a connecting part 43 connected at each end of the legs, and an I-type core 50 formed of an electromagnetic steel sheet and having the same length as the connecting portion, the I-type core being placed on and bonded to the connecting part of the E-type core to form a single-piece core component.

Abstract: The present invention provides a current transformer module that can prevent the primary coil from being lifted or dropped and prevent the bobbin from being cracked when the primary coil is inserted into the bobbin. The current transformer module 12 of the present invention comprises a current transformer 10 including a resin-made bobbin 20 and a core 50 mounted on the bobbin, wherein the bobbin has a U-shaped primary coil 30 disposed in a primary coil through-hole 40 and a wire-wound secondary coil 27, and a casing 80 for housing the current transformer, wherein the primary coil is a U-shaped pin having a pair of legs 32, 32 and a U-shaped bent portion 31 for connecting the legs, and the casing has a concaved contact area 82 positioned opposite the U-shaped bent portion of the primary coil to prevent the primary coil from falling out.

Abstract: The present invention provides a core for an electric current detector in which a plurality of gaps can be formed while the paring of core pieces is maintained, and a method for manufacturing the same. A core for an electric current detector 10 according to the present invention includes: a pair of core pieces 20 and 23 that are obtained by cutting an annular core main body 12 in a radial direction at two positions and are arranged such that cross-sectional surfaces 21 and 24 are opposed to each other with a first gap 26 and a second gap 28 being interposed therebetween; and a first partial molding 30 and a second partial molding 40 that are made of resin and cover portions of the peripheral surfaces of the cross-sectional surfaces of the core pieces opposed to each other with the first gap and the second gap being interposed therebetween. The first partial molding includes a bridge portion 33 that serves as a connection portion and spans the gap.

Abstract: A core for an electric current detector comprises a pair of first and second core pieces (20), (23), wherein the first core piece has first opposed surfaces (21), (21) and the second core piece has second opposed surfaces (24), (24), the first and second opposed surfaces face to each other with a spacing between a first gap (26) and a second gap (28), respectively, and the first and second core pieces are covered by a resin-made first partial mold (30) on the area near and inclusive of the first gap and are covered by a resin-made second partial mold (40) on the area near and not inclusive of the second gap, wherein the second partial mold includes a second-1 molded member (41) on the first core piece side and a second-2 molded member (42) on the second core piece side.

Abstract: The present invention provides a core member, a gapped core, and a current sensor in which the gap width of a core main body that is entirely or partially covered by a resin mold portion can be set as appropriate, and insulation between the core main body and a bus bar opening can be achieved. A core member 10 according to the present invention is a core member that includes a gap forming region C in which a gap 21 is formed.

Abstract: The present invention provides a core for an electric current detector in which a plurality of gaps can be formed while the paring of core pieces is maintained, and a method for manufacturing the same. A core for an electric current detector 10 according to the present invention includes: a pair of core pieces 20 and 23 that are obtained by cutting an annular core main body 12 in a radial direction at two positions and are arranged such that cross-sectional surfaces 21 and 24 are opposed to each other with a first gap 26 and a second gap 28 being interposed therebetween; and a first partial molding 30 and a second partial molding 40 that are made of resin and cover portions of the peripheral surfaces of the cross-sectional surfaces of the core pieces opposed to each other with the first gap and the second gap being interposed therebetween. The first partial molding includes a bridge portion 33 that serves as a connection portion and spans the gap.

Abstract: The present invention provides a core for an electric current detector in which a plurality of gaps can be formed while the paring of core pieces is maintained, and a method for manufacturing the same.

Abstract: In an electric current detector according to the present invention, an annular core 2 having a magnetic gap G and a Hall element 41 which is located in the magnetic gap of the core 2 and detects a magnitude of an electric current passing through the core 2 are arranged in an outer case 1. Here, in the core 2, a mold resin portion 3 which covers a surface of the core 2 over part of an overall length along a magnetic path thereof is molded at one or a plurality of portions along the magnetic path to configure an integral core component, the core component being fixed into the outer case 1 in a state where a surface of the mold resin portion 3 makes contact with an inner surface of the outer case 1.

Abstract: A method is described for cutting a plurality of molded cores. Each core includes an annular magnetic body made of a magnetic material and a covering part made of an insulating resin that covers the magnetic body. The method includes coupling each of the molded cores side by side in an axial direction, and cutting the molded cores at a first cutting part and at a second cutting part that transect an outer peripheral surface and an inner peripheral surface and approach each other toward an inner periphery direction of the molded core. The main body has a main body-side first end face formed by cutting at the first cutting part and a main body-side second end face formed by cutting at the second cutting part. A segment has a segment-side first end face formed by cutting at the first cutting part and a segment-side second end face formed by cutting at the second cutting part.

Abstract: The present invention provides a bobbin-shaped air-cooled common mode choke coil that can suppress heat generation. The air-cooled common mode choke coil 10 according to the present invention is a common mode choke coil 10 in which an annular core 30 is housed in an annular bobbin 20, and a coil 40 is wound around the outer circumference of the bobbin 20. An airflow path A that allows an airflow B to flow therethrough is formed between the bobbin 20 and the core 30. The bobbin 20 includes one or more openings 21 and 22 that are in communication with the airflow path A. Flanges 23 and 24 are provided protruding along the peripheral edges of each of the openings 21 and 22. The openings 21 and 22 are desirably formed in the outer circumferential surface of the bobbin 20 and reache the upper and lower surfaces of the bobbin 20.

Abstract: The present invention is to provide a plurality of unit coil portions formed by winding one conductive wire about a winding axis is placed side by side in the winding axis direction, each of the unit coil portions is formed by unit wound portions having different inner circumferential lengths from each other, the unit coil portion is multi-layered in at least a part thereof by pushing at least a part of the unit wound portion having a small inner circumferential length inside the unit wound portion having a large inner circumferential length, and the unit wound portion is wound along a loop shape winding route having a plurality of arc shape corner parts. In unit wound portions forming the unit coil portion, corner parts formed at the same phase angle with respect to the winding axis are formed in an arc shape having curvature center at the same position.

Abstract: The present invention provides a core member, a gapped core, and a current sensor in which the gap width of a core main body that is entirely or partially covered by a resin mold portion can be set as appropriate, and insulation between the core main body and a bus bar opening can be achieved. A core member 10 according to the present invention is a core member that includes a gap forming region C in which a gap 21 is formed.

Abstract: In an electric current detector according to the present invention, an annular core 2 having a magnetic gap G and a Hall element 41 which is located in the magnetic gap of the core 2 and detects a magnitude of an electric current passing through the core 2 are arranged in an outer case 1. Here, in the core 2, a mold resin portion 3 which covers a surface of the core 2 over part of an overall length along a magnetic path thereof is molded at one or a plurality of portions along the magnetic path to configure an integral core component, the core component being fixed into the outer case 1 in a state where a surface of the mold resin portion 3 makes contact with an inner surface of the outer case 1.

Abstract: In an electric current detector according to the present invention, an annular core 2 having a magnetic gap G and a Hall element 41 which is located in the magnetic gap of the core 2 and detects a magnitude of an electric current passing through the core 2 are arranged in an outer case 1. Here, in the core 2, a mold resin portion 3 which covers a surface of the core 2 over part of an overall length along a magnetic path thereof is molded at one or a plurality of portions along the magnetic path to configure an integral core component, the core component being fixed into the outer case 1 in a state where a surface of the mold resin portion 3 makes contact with an inner surface of the outer case 1.

Abstract: The present invention provides a method for cutting a molded core by which a molded core including a magnetic body are collectively cut.

Abstract: The present invention provides a coil apparatus formed by mounting a coil component to a casing. A core coil apparatus according to the present invention has a main body (30) and a segment (40) that are obtained by a molded core (20) including an annular magnetic body made of a magnetic material and an insulating resin covering part that covers the magnetic body being cut at a first cutting part and a second cutting part that transect an outer peripheral surface and an inner peripheral surface and approach each other toward an inner periphery of the molded core, the segment being disposed in a cutout part (31) formed on the main body, the resin covering part (22) having a main body-side flange part (25) and a segment-side flange part (27) that project toward the outer peripheral side and/or the lateral side, a coil (51) wound around the core and a casing (70) mounted with the core, the casing having a recess (72) into which the main body-side flange part and the segment-side flange part are inserted.

Abstract: The present invention provides a gapped core that facilitates adjustment of DC bias characteristics, has little variation in those characteristics, and also allows for excellent manufacturing efficiency.

Abstract: In order to provide an air core coil fitting apparatus that can automatically fit an air core coil onto a core, an air core coil fitting apparatus includes a holding member, a coil fitting rod, a rod driving member, a pushing member, and a sending member. The holding member holds a core main body that is formed in a ring shape, has a gap extending through the core main body from an inner circumferential face to an outer circumferential face thereof, and allows an air core coil wound in advance to be fitted onto the core main body from one end thereof. On the coil fitting rod, the air core coil that is to be fitted onto the core main body held by the holding member is fitted. The rod driving member brings a front end of the coil fitting rod close to or into contact with the one end of the core main body held by the holding member. The pushing member pushes the air core coil fitted on the coil fitting rod, toward the one end of the core main body.