Abstract: A magnetic core material contains an Fe-based soft magnetic powder in which an inorganic insulating film 4b is formed on a surface of an Fe-based soft magnetic particle 4a, and an epoxy resin 4c containing a curing agent. The Fe-based soft magnetic particle 4a is formed of a pure iron powder or a low-alloy steel powder. A content of the epoxy resin containing the curing agent is 2 to 5 mass %. The epoxy resin is a mixture of a bisphenol A-type epoxy resin and a novolac-type epoxy resin.

Abstract: Provided is an electric transmission device that is provided at relatively rotating parts of a mechanical apparatus. The electric transmission device (E) includes a pair of magnetic elements (1A, 1B) relatively rotatable about the same axis (O). The magnetic elements (1A, 1B) each includes a core (2A, 2B) and a coil (3A, 3B) having a conductive wire. One of the coil (3A) and the coil (3B) is located at an inner side of the other coil in a radial direction, and the coils (3A and 3B) are magnetically coupled to each other. Each bobbin (4A, 4B) includes a cylinder (4aA, 4aB) and a dis-shaped flange (4bA, 4bB). The flanges (4bA, 4bB) are slidably in contact with each other at contact surfaces (10a, 11a) thereof in the axial direction.

Abstract: Provided is a sintered bearing that is capable of reducing cost through reduction in usage amount of copper, excellent in initial running-in characteristics and quietness, and is high in durability. Raw material powders including iron powder, flat copper powder, low-melting point metal powder, and graphite are loaded into a mold, and a green compact is formed under a state in which the flat copper powder is caused to adhere onto a molding surface. Subsequently, sintering is carried out without causing iron in the green compact to react with carbon so that an iron structure is formed of a ferrite phase. In this manner, a sintered bearing (1) including a base part (S2) including copper at a uniform content, and a surface layer (S1) covering a surface of the base part (S2) and including copper at a larger content than the base part (S2) can be obtained.

Abstract: Provided is a magnetic element, including: a coil assembly in which a coil is provided on an outer periphery of an inner core; and an outer peripheral core provided to cover an outer periphery of the coil assembly. The outer peripheral core has: an opening that allows the coil assembly to be inserted therein; and a fixing part configured to fix the coil assembly into the outer peripheral core. The coil is sealed by a sealing resin. A lid member is mounted to an opening of the outer peripheral core, and is configured to reduce a gap between the coil and the outer peripheral core in the opening so as to reduce a filling amount of the sealing resin.

Abstract: To provide a magnetic element such as a pot-shaped inductor in which a coil is covered by a magnetic body, having excellent cooling performance and being capable of suppressing heat generation. An inductor 1 as the magnetic element is provided with a coil formed by winding a winding wire, a magnetic body 2 in which the coil 5 is arranged and which transmits magnetic flux generated by the coil 5. The magnetic body 2 includes an air-cooling portion for air-cooling the magnetic element, on a magnetic body outer diameter portion which covers an outer diameter side of the coil 5. The air cooling portion is formed of a slit 7 as a hole structure penetrating the magnetic body outer diameter portion. Further, in a configuration in which the coil is sealed by a sealing resin, the magnetic body includes a flow control path, which controls a flow of the resin in filling the sealing resin, on a surface facing the coil.

Abstract: The present invention facilitates positioning of contact surfaces of a resin case, core gap management, and assembling processing. A resin case 1 can house at least one magnetic core selected from a U-shaped magnetic core, a UU-shaped magnetic core, a UR-shaped magnetic core, and an I-shaped magnetic core. The resin case 1 is used for an inductance element in which a coil is arranged around the magnetic core so as to house the magnetic core. The resin case is an assembly of a plurality of divided members with the same shape. A recess and a projection A1, A2 mutually fitted complementary to each other are formed on end surfaces of the divided members contacted with each other.

Abstract: Provided is a compact inductor in which electric insulation between a coil and a core is ensured. The inductor includes a core, a bobbin, and a coil. The core has a middle portion extending in a direction, and two collar portions spreading radially outward from both respective ends of the portion in the direction. The bobbin has a cylindrical portion extending in the direction and fitted to an outer periphery of the portion. The coil is wound on the portion via the portion. The bobbin further includes flange portions extending from both respective ends of the portion, each portion separating the corresponding portion from the coil, and a positioning portion located at a radially inner side with respect to a radially outer end of the portion. The positioning portion faces the corresponding portion, and projects toward and abuts the corresponding portion.

Abstract: Provided is an electric transmission device that is provided at relatively rotating parts of a mechanical apparatus. The electric transmission device (E) includes a pair of magnetic elements (1A, 1B) relatively rotatable about the same axis (O). The magnetic elements (1A, 1B) each includes a core (2A, 2B) and a coil (3A, 3B) having a conductive wire. One of the coil (3A) and the coil (3B) is located at an inner side of the other coil in a radial direction, and the coils (3A and 3B) are magnetically coupled to each other. Each bobbin (4A, 4B) includes a cylinder (4aA, 4aB) and a dis-shaped flange (4bA, 4bB). The flanges (4bA, 4bB) are slidably in contact with each other at contact surfaces (10a, 11a) thereof in the axial direction.

Abstract: Provided is a hybrid magnetic device obtained by combining a central core having a higher relative permeability than a peripheral core but is able to inhibit magnetic saturation of the peripheral core having a low relative permeability. The magnetic device (1) includes: a peripheral core (5) disposed around the outer periphery of a coil (3); a central core (6) having a higher relative permeability than the peripheral core (5); and connection core portions (6, 6) at the outsides of ends in an axial direction of the coil (3), each connecting the central and peripheral cores (4, 5). Each or one of the portions (6, 6) includes a flange (4a) integrated with the central core (4) and extending from the central core (4) toward the peripheral core (6). The portions (6, 6) include a connection element (5a) other than the flange (4a), integrated with the peripheral core (5).

Abstract: Provided is a sintered bearing that is capable of reducing cost through reduction in usage amount of copper, excellent in initial running-in characteristics and quietness, and is high in durability. Raw material powders including iron powder, flat copper powder, low-melting point metal powder, and graphite are loaded into a mold, and a green compact is formed under a state in which the flat copper powder is caused to adhere onto a molding surface. Subsequently, sintering is carried out without causing iron in the green compact to react with carbon so that an iron structure is formed of a ferrite phase. In this manner, a sintered bearing (1) including a base part (S2) including copper at a uniform content, and a surface layer (S1) covering a surface of the base part (S2) and including copper at a larger content than the base part (S2) can be obtained.

Abstract: Provided is a sintered bearing that is capable of reducing cost through reduction in usage amount of copper, excellent in initial running-in characteristics and quietness, and is high in durability. Raw material powders including iron powder, flat copper powder, low-melting point metal powder, and graphite are loaded into a mold, and a green compact is formed under a state in which the flat copper powder is caused to adhere onto a molding surface. Subsequently, sintering is carried out without causing iron in the green compact to react with carbon so that an iron structure is formed of a ferrite phase. In this manner, a sintered bearing (1) including a base part (S2) including copper at a uniform content, and a surface layer (S1) covering a surface of the base part (S2) and including copper at a larger content than the base part (S2) can be obtained.

Abstract: The present invention provides a magnetic element in which iron loss-caused heat generation is restrained and which can be produced with a high productivity. The magnetic element has a magnetic body which allows a magnetic flux generated by a coil (4) to pass therethrough. The magnetic body is a combined body formed by combining two halves, of the magnetic body composed of the compression molded and injection molded bodies, obtained by bisection made in an axial direction of the coil with each other. A compression molded magnetic body (2) is disposed at a portion generating iron loss-caused heat to a high extent or a portion inferior in heat dissipation performance. An injection molded magnetic body (3) is disposed at a portion other than the portion where the compression molded magnetic body is disposed. The compression molded and injection molded magnetic bodies are combined with each other.

Abstract: To provide a magnetic core component capable of suppressing leakage flux while suppressing the number of molds required at the time of molding, and a chip inductor using the same. A magnetic core component (1) includes a winding shaft portion (1a) for winding a winding wire (4); is formed by joining two half-members (2, 3), which are magnetic bodies and have the same shape; includes a leg portion (1b) arranged at both ends of the winding shaft portion (1a) and a cover portion (1c) arranged across one end of the leg portions in parallel with the winding shaft portion (1a); and has a joining surface (1d) which is formed in the winding shaft portion (1a) and the cover portion (1c) and which is a surface non-perpendicular to an axial direction of the winding shaft portion (1a).

Abstract: To provide a magnetic element such as a pot-shaped inductor in which a coil is covered by a magnetic body, having excellent cooling performance and being capable of suppressing heat generation. An inductor 1 as the magnetic element is provided with a coil formed by winding a winding wire, a magnetic body 2 in which the coil 5 is arranged and which transmits magnetic flux generated by the coil 5. The magnetic body 2 includes an air-cooling portion for air-cooling the magnetic element, on a magnetic body outer diameter portion which covers an outer diameter side of the coil 5. The air cooling portion is formed of a slit 7 as a hole structure penetrating the magnetic body outer diameter portion. Further, in a configuration in which the coil is sealed by a sealing resin, the magnetic body includes a flow control path, which controls a flow of the resin in filling the sealing resin, on a surface facing the coil.

Abstract: To provide an inductor capable of suppressing decrease of inductance in large current without magnetically saturating a magnetic core in large current of several thousand amperes like serge current and to provide a protection circuit using the inductor. The inductor is formed of an iron-based magnetic core 3 having a main coil 2 therein. A short circuit coil 4 having a function of cancelling a magnetic field generated by application current applied to the main coil 2 and having a coil winding start and a coil winding end being short-circuited is arranged coaxially with the main coil 2 in the magnetic core 3. The magnetic core 3 has magnetic cores with the same shape abutted on an abutting face 5. The protection circuit has a circuit breaker connected between a direct current power source and a load, and a current limiting inductor is connected to the circuit breaker in series.

Abstract: The present invention facilitates positioning of contact surfaces of a resin case, core gap management, and assembling processing. A resin case 1 can house at least one magnetic core selected from a U-shaped magnetic core, a UU-shaped magnetic core, a UR-shaped magnetic core, and an I-shaped magnetic core. The resin case 1 is used for an inductance element in which a coil is arranged around the magnetic core so as to house the magnetic core. The resin case is an assembly of a plurality of divided members with the same shape. A recess and a projection A1, A2 mutually fitted complementary to each other are formed on end surfaces of the divided members contacted with each other.

Abstract: Provided is a powder for a magnetic core (1), including a soft magnetic metal powder (2); and an insulating coating film (3) covering a surface of the soft magnetic metal powder (2), in which the insulating coating film (3) is formed of an aggregate of crystals (4) obtained by cleaving a layered oxide. The crystals (4) are obtained by, for example, cleaving a swellable smectite-group mineral, which is one kind of swellable layered clay mineral as the layered oxide.

Abstract: The present invention provides a magnetic element in which iron loss-caused heat generation is restrained and which can be produced with a high productivity. The magnetic element has a magnetic body which allows a magnetic flux generated by a coil (4) to pass therethrough. The magnetic body is a combined body formed by combining two halves, of the magnetic body composed of the compression molded and injection molded bodies, obtained by bisection made in an axial direction of the coil with each other. A compression molded magnetic body (2) is disposed at a portion generating iron loss-caused heat to a high extent or a portion inferior in heat dissipation performance. An injection molded magnetic body (3) is disposed at a portion other than the portion where the compression molded magnetic body is disposed. The compression molded and injection molded magnetic bodies are combined with each other.

Abstract: The present invention provides a magnetic core part by which failures such as cracks do not occur even if the magnetic core part contains 90% by mass or more of an amorphous metal powder. The magnetic core part is formed by thermoset molding at least one magnetic powder selected from an amorphous metal powder alone and an amorphous metal powder coated with an insulating material, and a thermosetting binder resin. The magnetic core part contains the magnetic powder in an amount of 90% by mass or more and 99% by mass or less with respect to the total amount of the magnetic powder and the thermosetting binder resin.

Abstract: Provided is a powder magnetic core (1), including; a magnetic core main body (2) obtained by compression-molding raw material powder containing, as a main component, soft magnetic metal powder (3) having a surface coated with an insulating coating (4) having a decomposition temperature of 600° C. or more; and a sealing part (6) configured to seal inner pores of the magnetic core main body (2), in which: the magnetic core main body (2) has a relative density of 94.5% or more and 97% or less; and the powder magnetic core (1) has a porosity of 2.0% or less.