Abstract: An amorphous transformer which includes an amorphous core formed of an amorphous material with a lap provided at an upper portion and allowed to stand in substantially a vertical direction while being supported at a core support member, and a coil which is fitted with the amorphous core. The core support member is formed by integrating a core support member for supporting a side surface of the amorphous core and a corner support member for supporting a corner portion of the core. The core support member is provided in substantially a vertical direction along at least one of the side surfaces of the core.

Abstract: First and second divisional cores each including right and left leg portions and a yoke interconnecting those together are formed by molding respective yoke-side core members in a resin. Cylindrical core mounting portions extending from the outer circumference of the surface of the yoke-side core member are formed integrally with the respective right and left leg portions of the first. divisional core. I-shaped leg-portion-side core members and spacers are attached in the cylindrical core mounting portion formed in each of the right and left leg portions. The surface of the yoke-side core member molded in the resin and the surface of the leg-portion-side core member are disposed so as to have a spacer therebetween. The two divisional cores are joined together by butting respective leg portions of the two divisional cores with each other to form an annular mold core, and a coil is wound around the mold core.

Abstract: An amorphous alloy-based magnetic core with reduced audible noise and a method of making the amorphous alloy-based magnetic core emanating low audible noise, including: placing the core with multiple layers of high strength tape on the core legs, wherein the tapes have a high tensile strength, high dielectric strength and high service temperature, resulting in reduced level of audible noise. When operated under optimum condition, the reduced level of audible noise is 6-10 dB less when compared with a same-size core that has been coated with resin instead.

Abstract: A stereo-triangular wound-core power transformer with a voltage class more than or equal to 110 kV is disclosed, which includes a stereo-triangle wound-core and windings, wherein the core includes iron yokes and core pillars which are arranged in a stereo-triangle shape, with every two adjacent core pillars connected through an iron yoke. The power transformer further includes angle rings, end rings, insulating end rings, insulating end plates and a frame-type clamp, wherein the angle rings, insulating end rings, end rings and insulating end rings are arranged at both ends of the core pillars in sequence, respectively, and the ends of the core pillars are arranged on the insulating end plates. The frame-type clamp covers the iron yokes, and the supporting boards of the frame-type clamp are connected with the insulating end plates through pressing screws.

Abstract: A three phase compact high short circuit current reactor also commonly known as an inductor is disclosed which can be easily be modified during initial construction to provide predefined gaps between the internal core sections for enhancing performance for each individual customized application. Inductor core sections are commonly oriented horizontally. The present design provides a core construction which includes multiple vertically stacked coils with yokes positioned between adjacent coils for facilitating flux cancellation to enhance performance. The coils can be round or square in cross-section and normally are made of either wire or foil usually of copper or aluminum. The material of the core is preferably of a silicon steel material which can be grain-oriented or non-grain-oriented.

Abstract: An electromagnet for use in a relay having a coil bobbin with flange portions at both ends of a coil winding portion where a coil is wound and an iron core with a flange-like head portion at one end of a body portion, the coil bobbin being so fitted onto the iron core that the flange-like head portion and the other end of the body portion of the iron core respectively project out of each of openings formed at the flange portions of the coil bobbin. The iron core has at the other end an engageable portion to be engaged with an engaging portion formed on a grasping part of a coil winding chuck device. The electromagnet further has between the coil bobbin and the iron core a means for preventing misregistration of the coil bobbin fitted onto the iron core.

Abstract: To provide a reactor whose number of components is small and that exhibits excellent assemblability. A reactor 1 includes a coil 2 having a pair of coil elements 2a and 2b, and a core unit 3 having a pair of intermediate core portions 30 around which the coil elements 2a and 2b are respectively disposed. The core unit 3 is formed to be annular by a combination of intermediate core pieces 31 that structure intermediate core portions 30, a pair of end core pieces 32 that clamps a pair of intermediate core portions 30 disposed in parallel to each other, and gap members 3g each disposed between each ones of the core pieces. The end core pieces 32 respectively include clamping faces 321 for clamping the intermediate core portions 30, each structured with a single plane. An installed face 320l of each of the end core pieces 32 projects further than the installed face 31l of the intermediate core pieces 31.

Abstract: A multi-point connection module comprising a supporting plate provided with a plurality of taps, and a connector which is coupled to the supporting plate. The connector allows the connection of the supporting plate to an external face of a transformer coil having a plurality of turns. The taps are arranged on the supporting plate so that they mate with corresponding turns of the coil.

Abstract: An amorphous transformer which includes an amorphous core formed of an amorphous material with a lap provided at an upper portion and allowed to stand in substantially a vertical direction while being supported at a core support member, and a coil which is fitted with the amorphous core. The core support member is formed by integrating a core support member for supporting a side surface of the amorphous core and a corner support member for supporting a corner portion of the core. The core support member is provided in substantially a vertical direction along at least one of the side surfaces of the core.

Abstract: There are provided a transformer and a flat panel display device including the same capable of securing leakage inductance and allowing easy manufacturing. The transformer according to the embodiment of the present invention includes: a bobbin part including a plurality of bobbins each including a tube-shaped body part having a penetration hole therein and one of flange parts protruded outwardly from both sides of the body part; a core inserted into the penetration holes in the bobbins to form a magnetic circuit; a coil part including respective coils wound around the bobbins; and a bobbin fixing member combined with either side surface of the bobbin part in which at least two of the bobbins are laminated, to fix and combine at least two of the bobbins.

Abstract: A coil substrate structure which enhances heat dissipation and fully secures a mounting area is provided. A coil substrate structure 100 comprises a first coil substrate 110 having a primary transformer coil part 41; a second coil substrate 120, disposed on the first coil substrate 110, having a secondary transformer coil part 42; and a transformer core 130 for magnetically connecting the transformer coil parts 41, 42 to each other. The coil substrates 110, 120 are disposed on each other while being shifted from each other such that the transformer coil parts 41, 42 overlap each other as seen in the substrate thickness direction. This can increase the heat dissipation area of the coil substrates 110, 120. The transformer coil parts 41, 42 have a width in a transmission direction A narrower than a width in a direction B intersecting the transmission direction A as seen in the substrate thickness direction. This can reduce the multilayer area of the coil substrates 110, 120 in the transmission direction A.

Abstract: [PROBLEM] By simplifying a core securing structure of a reactor, miniaturization, lightweight, and low costs of the reactor are achieved. [SOLVING MEANS] The core securing member to secure a core 109 in a case 101 in the reactor wherein the core 109 and the coil 105 are housed in the case 101 is made up of a first spring portion S1 which gives momentum to a side face of the core 109 in a horizontal direction and a second spring portion S2 which gives momentum to an upper face of the core 109 in a vertical direction. Moreover, a stopper portion to restrict popping of the core from the case and the second spring portion are integrally formed with a notch being interposed between the stopper and the second spring portion so that the stopper portion covers part of an upper face of the core.

Abstract: The invention comprises an inductor mounting method and apparatus. An about annular inductor is mounted using a non-conducting clamp element passing at least into a center opening of the inductor. Mounting hardware forces the clamp element toward a mounting surface to edge mount the inductor, where the mounting hardware, non-conducting clamp element, and mounting surface minimally contact the inductor. The minimal contact allows greater surface area for liquid, convective, and/or radiative cooling of the inductor. The inductor is optionally composed of particles of magnetic material coated with carbon and embedded into an epoxy to yield a distributed gap material.

Abstract: A method of testing a transformer prior to installation in a high-pressure environment wherein the transformer comprises a transformer core comprising a stack of a plurality laminations, is provided. The method comprises applying a mechanical compression force to the stack, the force being at least equivalent to the ambient pressure of the high-pressure environment; and testing the electrical efficiency of the transformer.

Abstract: A holding device for fastening a cast resin transformer winding relative to a transformer core has a support element and a receiving element attached to a tie rod. By fastening the support element to the receiving element attached to the tie rod, a cast resin transformer winding can be fixed rigidly and precisely centered relative to a transformer core. By attaching the receiving element directly on the tie rod, circulation in the lower region of the cast resin transformer winding or of an insulating cylinder also attached to the support element is ensured and thereby the thermal properties of a cast resin transformer winding produced in this way are improved. Furthermore a modular and thus simple design of the cast resin transformer is possible due to the possibility of connecting the receiving element to the tie rod by way of the support element.

Abstract: Methods and apparatus according to various aspects of the present invention may be implemented in conjunction with a inductor mount mounting to a mounting surface. The inductor mount may comprise an inductor having a center opening, and a surface area encompassing all of a front face, a back face, an inner surface about the center opening, and an outer edge concentric about the center opening. The inductor mount may further include mounting hardware holding the outer edge of then inductor to the mounting surface. A cooling element moves air into contact with the front face, through the center opening, and around the outer edge of the inductor. In various embodiments, the mounting hardware contacts less that ten percent of the surface area of the inductor.

Abstract: A transcranial magnetic stimulation induction coil device (“TMS coil device”) is manufactured to contain coil windings of a predetermined size and shape and fixedly positioned at a predetermined location within and orientation in relation to a casing of the TMS coil device. In one embodiment, the coil windings are encased in a casting at a predetermined location within and orientation in relation to the casting, and the casting is fixedly positioned at a predetermined location within and orientation in relation to the casing. The size and shape of the coil windings and the casing within, and the location and orientation of the coil windings in relation to each other and the casing of, the TMS coil device are known with a high level of precision, such that navigated brain stimulation can be performed with the TMS coil device with a high degree of accuracy.

Abstract: The present invention provides a novel direct current thyristor valve saturated reactor includes: case, winding in the case, iron cores, cooling fins, pipes and press fit mechanism. The iron cores are coupled with winding. The invention having the following advantages: simple, modular design, low connection capacity of the wingding, fixed dimension, winding and irons well-cooled, small noise and vibration. The saturated reactor is particularly suitable used as the positive saturated reactor for high voltage current thyristor valve.

Abstract: An inductor has a case having an opening, a core accommodated in the case, a coil wound on a part of the core and a fixing member fixed to the case. The fixing member fixes the core by contacting a top surface of the core facing the opening and elastically biasing the core toward a bottom surface of the case. The fixing member further includes a first plate portion and a first contacting portion. The first plate portion is disposed between the top surface of the core and the opening of the case and extending in parallel with the top surface of the core. The first contacting portion extends from a fore-end portion of the first plate portion so as to be U-shaped and having a distal end portion elastically push-contacting the top surface of the core.

Abstract: It is possible to provide a transformer core which can be mounted on a coil having both ends connected to a substrate or the like and can simplify the step for arranging an adhesive layer and suppress fluctuation of a magnetic gap. The transformer core (1) includes: a rectangular spacer (5, 20) having a region where a first convex portion (10, 21) is formed on the four sides of one of the surfaces as a unitary block and the first convex portion is not provided at least at a part of a pair of two opposing sides; and a sheet-shaped adhesive layer (6) bonded to a region where at least the first convex portion is not provided on the one of the surfaces of the spacer and connecting a soft ferrite core (4) to the spacer.

Abstract: The transformer has a bobbin, a coil assembly and a magnetic core assembly. The bobbin is mounted in the magnetic core assembly and has multiple connecting pins being formed on at least one side of a bottom surface of the bobbin. Each connecting pin has a top surface as a soldering surface that corresponds to a solder pad on a back of a circuit board. At least one fastener is further formed on the bottom surface of the circuit board. Therefore, when the transformer is mounted through the circuit board, the connecting pins are soldered on the back of the circuit board to reduce the total thickness of the combination of the transformer and the circuit board.

Abstract: The magnetic core and electrical coils of a multiple phase inductor are held together by a non-magnetically permeable retainer. The retainer has a base with a cavity that receives the magnetic core and has U-shaped arms that form channels which guide and align the components during assembly. A retainer cap snaps onto the base in a manner that retains the core elements and electrical coils. An electrical terminal block also snaps onto the cap for easy assembly.

Abstract: A core is configured with two O-type cores and an I-type core which is separate from the O-type cores. In a transformer comprising a core of the type, by incorporating a first O-type core, a bobbinless coil block and a second O-type core to be stacked on a terminal block sequentially, excellent assemblability is achieved. Further, the first O-type core is incorporated from one side to the terminal block, and the bobbinless coil block and the second O-type core are incorporated by stacking up from the other side. Further, the first O-type core, the bobbinless coil block, the second O-type core and the terminal block are assembled by being stacked up.

Abstract: A transformer core includes a stack of a plurality of planar core plates of a magnetically permeable material, which plates each consist of a first and a second sub-part that together enclose at least one opening. The sub-parts can be fitted together via contact faces that are located on either side of the opening and that extend obliquely with respect to the centerline of the core plate. The invention also relates to the use of the described transformer core in a Coriolis flowmeter with the Coriolis tube extending through the opening so as to induce a current in the tube.

Abstract: An inductive coil assembly having multiple coils arranged at distinct orientations to provide efficient inductive coupling of power or communications or both to a device when the device is arranged at different orientations with respect to the inductive primary coil. In one embodiment, the inductive coil assembly includes three coils, each oriented along one of the x, y and z axes of a standard Cartesian three-dimensional coordinate system. The three separate coils provide effective transfer of power and communication when the device is at essentially any orientation with respect to the primary coil. In an alternative embodiment, the multi-axis inductive coil assembly of the present invention can function as a primary to inductively transmit power or communication or both over a plurality of magnetic fields at distinct orientations.

Abstract: A high-density power converter that benefits from improved packaging techniques and thermal handling capability is provided. The power converter includes a magnetic core. The converter further includes a printed circuit board providing at least one cutout for receiving a portion of the magnetic core. A circuit is magnetically coupled to the magnetic core. A stopper is configured at an edge of the cutout proximate to the circuit to hold the magnetic core at a predefined distance relative to the circuit, thereby meeting a safety distance requirement between the core and the circuit. Advanced thermal management is provided by way of a heatsink assembly to enhance the thermal-handling capability of the converter.

Abstract: A coil assembly for a solenoid valve includes a bobbin formed from an electrically insulative material. A bore extends axially through the bobbin. A first flux ring having a sleeve extending axially from an annular base is mounted upon a first end of the bobbin with the sleeve extending into the bobbin bore. Similarly, a second flux ring also having a sleeve extending from an annular base is mounted upon a second end of the bobbin that is opposite from the first flux ring with its sleeve extending into the bobbin bore. The flux rings are formed from a magnetically permeable material that has a high heat conductivity. Magnet wire is wound upon the assembled bobbin and flux rings to form the coil assembly.

Abstract: The present invention is a kind of a transformer, equipped with a wire-winding flute on a wire-winding unit that has surrounding grooves added to each end, and adding plug pins to the for sides of a iron slot of a iron core, using the plug pins to attach itself to the inside of the grooves, for fast and close fixture of the wire-winding unit to the iron core, allowing the wire-winding unit to be not easily loosened, and also avoids collision leading to breakage of with the copper wires, thus increasing the tension resistance of the transformer, also increasing the surface distance between the high-pressure area and the iron core, to preventing short circuit.

Abstract: The invention concerns an inductive transmitter comprising two coils (1, 2), each with one core (3, 4). The two cores (3, 4) are capable of being moved relative to each other. Two systems are integrated in the transmitter that make it possible to simultaneously transmit data and/or energy, as well as the position of the two cores (3, 4) relative to each other. Finally, the transmission of data and/or energy takes place by means of induction, and the determination of the position of the two cores (3, 4) relative to each other takes place via a measurement of the magnetic field that exists between the two coils (1, 2).

Abstract: A laminated plate assembly in which the laminations in a stack are secured together by means of one or more interlocks or tabs that project from the uppermost lamination in the assembly through holes or slots in all the other laminations in the assembly, or around the periphery of the other laminations in the assembly, with each tab being bent or pressed against the underside of the bottom lamination in the assembly. This secures all the laminations in the stack together, much like a staple secures papers in a stack together, allowing for additional handling and processing of the laminated plate assembly without concern that the laminated plates in the stack will become misaligned or even become removed from the stack.

Abstract: Opposing concave structures formed in an end portion 22b of a stator yoke 22 and an end portion 23b of a magnetic core 23 are mated in a staggered manner and are joined. An upper projecting portion 22b-1 of the stator yoke 22 is fitted in a recessed portion formed on a lower projecting portion 23b-2 of the magnetic core 23, and the lower projecting portion 23b-2 of the magnetic core 23 is fitted in a recessed portion formed under the upper projecting portion 22b-1 of the stator yoke 22. In this state, the stator yoke 22 and the magnetic core 23 are fixedly fastened by a joint screw 24 and a tube 26. This structure makes it possible to reduce magnetic resistance in a magnetic circuit structure and to improve power-generating efficiency of a power-generating device using the structure.

Abstract: An improved reactor and ballast system is provided. The reactor includes a core having an I portion and a rolled portion which forms a core opening, a coil having an electrically insulated coil opening through which the I portion extends, and a spacer between the I portion and an edge of the rolled portion of the core. A portion of the coil extends into the core opening. The ballast system includes a core having a plurality of I portions and a rolled portion which form one or more core openings, a plurality of coils, each coil having an electrically insulated coil opening through which one of the I portions extends, and a plurality of spacers between the I portions and a first edge of the rolled portion and between the I portions and a second edge of the rolled portion. A portion of each coil extends into a corresponding core opening.

Abstract: The invention is to provide a method of making an amorphous laminated core having sufficient caulking strength and core shaping precision and having high precision in shaping the core and the caulking strength even if the amorphous laminated core has the minimum size for pocket telephones, and to provide such an amorphous laminated core. That is, a method of making the amorphous laminated core by punching core pieces from the amorphous thin sheet material, laminating the plural sheets of core pieces and caulking them, comprises a step of laminating the plural sheets of the core pieces having the caulking through-holes formed by punching, a step of inserting rod shaped materials into the caulking through-holes of the laminated core pieces, and a step of pushing back the inserted rod materials, thereby to caulk the core pieces of the plurality of laminated sheets. Further, in the amorphous laminated core, non-magnetic rod shaped materials are put in the caulking through-holes.

Abstract: An image heating apparatus has an excitation coil for generating a magnetic field and a heating member for dissipating heat by an eddy current induced in the heating member by that magnetic field. A core is provided for guiding the magnetic field and the core includes a sheet-shaped multi-layered magnetic member and is held by a holder which includes a cramping portion to cramp the core with the cramping portion.

Abstract: A circuit module has a circuit board on which electronic components are mounted and a covering member which has a plate portion and one or more supporting portions. The supporting portions fix the plate portion parallel to the surface of the circuit board. The covering member can be chucked by a chucking device to mount the circuit module to a mother circuit board.

Abstract: In order to improve efficiency of core rubbing operation and also to facilitate reduction in thickness of a coil device, a core-combining member includes substantially U-shaped topside and backside cover members, and a pair of core members are clamped and combined together from top and backsides by fitting the topside and backside cover members to each other. Legs of the topside cover member are provided with leg-openings formed therein while legs of the backside cover member are provided with convex parts for retaining to edges of the leg-openings so as to prevent detachment. A play clearance in the front and rear direction is provided between the convex part and an edge of the leg opening. Core rubbing is performed by relatively moving the cover members in the front and rear direction so as to integrally move the core members while maintaining the core members to be clamped. Stopper means is provided for restricting the relative displacement in the front and rear direction.

Abstract: A support is used to modify an inductive device to a surface mounting device. The inductive device is provided with a core and a coil, and the support includes an electric portion and an isolation portion. The electric portion, having a first surface and a second surface opposite to the first surface, is electrically coupled to the coil. The first surface of the electric portion is in contact with the core. The isolation portion is disposed on the second surface of the electric portion in a manner such that the isolation portion covers one part of the second surface of the electric portion. The isolation portion is flush with the other part of the second surface of the electric portion.

Abstract: A pencil ignition coil assembly module (40) that has a frusto-conically tapered core (46) and encapsulation (280) surrounding the side of the core. Features (216, 230, 234) center the core to a bobbin 48. A retainer (240, 240A) captures the core within the bobbin.

Abstract: A core has a plurality of plate-shape core pieces with a magnetic pole tooth and having connecting portions formed at one end and having a first circular arc end surface and having at the other end a second end surface which can mate with the first end surface of an adjoining core piece. The core pieces are arranged in the shape of a strip through the end surfaces to form a first core member and a second core member. The core members are stacked so that the ends of adjoining core pieces in the stacking direction overlap and such that adjoining connecting portions can freely rotate through connecting means to form a ring with the magnetic pole teeth on the inside. A cutout is formed in the corner of the outer side of the core in the second end surface of each core piece.

Abstract: The invention relates to a toroidal choking coil comprising a substantially annular core, a winding around the core, and a fixing device arranged around the core substantially between the core and the winding. The toroidal choking coil is characterized in that the fixing device comprises a hoop-like collar and one or more fasteners resting on the collar for attaching the toroidal choking coil onto fastening surfaces of a mounting site. The collar and the fasteners resting on the collar are manufactured from one piece. An inner rim that fastens against the core of the collar comprises several adjacent wavefronts that are transversely located with respect to an outer surface of the core and that comprise successive valleys and protrusions.

Abstract: A matrix transformer and/or inductor module has its terminations bonded rigidly to the ferrite core of which it is made. Because the ferrite core is strong and dimensionally stable, the terminations are rugged and precisely located, important criteria for assembly to printed circuit boards and the like, especially if automated assembly methods are used. In another embodiment, the module has top and bottom metal plates which are the high current output terminals. This module can be mounted sandwiched between live heat sinks. In another embodiment, deep grooves are made into the core material, and fins are bonded into the grooves. The grooves reduce core losses by reducing eddy currents and dimensional resonance effects, and the fins remove heat from within the core allowing operation at much higher flux density and frequency.

Abstract: A common mode choke coil is realized in which countermeasures against leakage flux are taken so as to reduce adverse effects on an external apparatus. Coils 291, 292 are wound around a toroidal magnetic core 22 and sandwich a partition plate 27 provided within an inner circumference of the magnetic core so as to cancel out respective magnetic fluxes produced by the coils relative to a normal mode current. A belt-like magnetic shield plate 24 is provided in a direction along leakage fluxes from the coils and attached closely to a substantially U-shaped insulating protection plate 23 having side walls 25, 25 and the insulating protection plate 23 is then detachably attached to a base 21 with catches 26 provided at both ends of the plate 23.

Abstract: A transformer includes a tank having a side wall, a core defining a core window, and a pair of coils, each of which surrounds a portion of the core and includes a portion passing through the core window. The transformer further includes a core and coil support member that extends through the core window to support the core and coils. The core and coil support member includes an upper flange and a lower flange, each flange having a channel formed along an outer surface of the flange that conforms in shape to an inner surface of the core. The core and coil support member includes a web that extends between and connects the upper and lower flanges, the web including first and second ends that extend out from the flanges. The transformer includes a support bracket that attaches to the side wall of the tank, and centers and supports the core and coil support member. The support bracket includes three sides that define a channel through which an end of the core and coil member extends.

Abstract: A core of a solenoid actuator is provided which is improved in durability, and at the same time ensures high energy efficiency of the solenoid actuator. The core of the solenoid actuator attracts an armature during operation of the solenoid actuator. A plurality of core plates are formed of a magnetically soft material and laminated in a predetermined direction orthogonal to a direction of attracting the armature to form a laminated stack. The core plates form magnetic circuits between the armature and the core plates themselves during the operation of the solenoid actuator. Two core holders formed of a non-magnetic material sandwiches the laminated stack of the plurality of core plates from opposite sides along the predetermined direction. The plurality of core plates are each coated with insulating film, which insulate adjacent two core plates from each other.

Abstract: A coil assembly comprises a bobbin for supporting a coil. The bobbin supports a metal ferrule. A metal bracket is releasably coupled to the bobbin. The bracket holds the ferrule in place. The ferrule and the bracket are arranged to cooperatively serve as a return path for magnetic flux. A method for assembling a solenoid valve may comprise the steps of coupling a flux return structure about a coil, connecting the coil to an electrical circuit, and orienting the coil about the armature of the valve.

Abstract: An apparatus and method for releasable securement together of a transformer power supply assembly together which includes a stacked arrangement (20) of a first transformer core plate (28) positioned to overlie a circuit board (26), a second transformer core plate (24) positioned to underlie the first transformer core plate (28) and the circuit board (26) and a carrier member (22) positioned beneath the second transformer core plate (24), the first and second transformer core plates (28,24) contact one another through at least one opening positioned in the circuit board (26). The apparatus includes having a body positioned over the first transformer core plate (28) in which the body of the span member (32) extends over a surface of the first transformer core plate (28) and extends from a portion of a peripheral edge of the first transformer core plate (28) to another portion of the peripheral edge of the first transformer core plate (28).

Abstract: The current transformer comprises a magnetic circuit and a secondary winding. The magnetic circuit is formed by stacked metal plates. Each plate comprises a cut-out without an air-gap. The magnetic circuit comprises a fixed first part enabling the secondary winding to be received and a flexible second part able to be momentarily deformed. The current transformer is advantageously used in protection relays and electronic trip devices of circuit breakers.

Abstract: The invention relates to an arrangement for implementing a planar magnetic circuit on a circuit board. The arrangement includes (a) printed circuit board (PCB), wherein a conductive wire pattern of an inductive circuit is formed as well as openings through the circuit board close to the conductive pattern, (b) two ferrite pieces, at least one of which can be fitted into the openings so that the pieces may be pressed against one another from opposite sides of the circuit board, and (c) a mechanical clamp which can be fitted around the ferrite pieces to lock them to each other, whereby the clamp extends around the ferrite pieces located on both sides of the circuit board.

Abstract: A transformer comprising: a coil bobbin which includes a pair of core winding portions and a pair of coupling portions for coupling the core winding portions so as to space the core winding portions a predetermined distance from each other and is formed, on its whole outer periphery, with a groove; a winding which is obtained by winding a conductor around the groove of the coil bobbin a predetermined number of times; and a pair of wound cores each of which is obtained by winding an electromagnetic steel plate around each of the core winding portions of the coil bobbin a predetermined number of times; wherein an outer peripheral surface of each of opposite side walls of the groove at the core winding portions is curved so as to have an arcuate cross-sectional shape.

Abstract: A structure of a surface-mount coil is provided which prevents a decrease in the fixing strength between the core and the lead frame of the surface-mount coil when soldering of a surface-mount coil to a mount board. Specifically, the structure of the surface mount coil of the present invention suppresses movement and diffusion of molten solder to lower faces of the core placing portions when soldering the external connection terminals to electrode lands of the mount board. The molten solder is detained on the electrode lands to form sufficient solder fillet on the external connection terminals, resulting in suppression of generation of defects in soldering and prevention of decreases in the fixing strength between the core and the lead frame by preventing heat transfer to the upper surface of the core mount portion of the surface mount coil.