Abstract: A semiconductor transformer provides high frequency operation by forming the primary windings of the transformer around a section of magnetic material that has a hard axis that lies substantially parallel to the direction of the magnetic field generated by the primary windings. The core can also be formed to have a number of sections where the magnetic flux follows the hard axis through each section of the core.

Abstract: An improved choke assembly for a power electronics device is provided. More specifically, a choke assembly with improved protection from environmental conditions such as dirt and water is provided. An improved choke assembly may include an insulative housing for an inductor coil that seals the inductor coil from the environment.

Abstract: A coil-type electronic component has a coil inside or on an outer surface of its base material and is characterized in that: the base material is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; the oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via the oxide layer.

Abstract: Linear variable differential transformers include a core comprising a non-ferromagnetic material and a ferromagnetic material, and a coil assembly including an axial bore within which the core is disposed and through which the core axially translates.

Abstract: Disclosed herein is a coil bobbin for a superconducting magnetic energy storage. The coil bobbin includes coil bobbin frames, superconducting coils, first support plates, second support plates and a center frame. The coil bobbin frames are provided in such a way as to face each other. The superconducting coils are wound around the respective coil bobbin frames. The first support plates are provided on surfaces of the respective coil bobbin frames that are on faces that are opposite to the surfaces between the coil bobbin frames that face each other. The second support plates are provided on the respective facing surfaces of the coil bobbin frames. The center frame is disposed between the second support plates and has an annular plate shape having a thickness that is gradually reduced towards a center of the toroidal arrangement.

Abstract: A transformer having laminar type on low voltage side is disclosed. The transformer includes a high voltage side part and a low voltage side part. The high voltage side part further includes a first base seat, a first isolator seat having a plurality of isolator grooves, and a plurality of coil sets. The first isolator seat has its one end connect to the first base seat while has its other end surface possess a positioning groove. The plurality of coil sets are wound around the first isolator seat, are corresponding to and are positioned in the plurality of isolator grooves. The low voltage side part further includes a second base seat, a second isolator seat having a central column, and a plurality of sheet body. The second isolator seat has its one end that is connected to the second base seat. The central column has its one end surface position at the positioning groove. Each of the sheet body possesses an opening for containing the central column.

Abstract: A system, such as a charging system, is provided. The system can include a coil. A connection module can be coupled to the coil and configured to allow the coil to communicate with an energy source to generate a magnetic field. A field-focusing element can be included, the field-focusing element acting to focus the magnetic field when the magnetic field varies in time at a predetermined rate. In one embodiment, the field-focusing element may be configured to focus the magnetic field in an area separated from the coil by at least about 5 cm.

Abstract: Disclosed herein is a ballast for multiple lamps and a method of manufacturing the ballast. A first coil is wound around a bobbin which has a partition formed in the center portion of an inner space thereof. An insulating sheet is stacked on the first coil, and a second coil is wound around the insulating sheet. Two paired core elements are vertically coupled to each other to form each core. Ends of the core elements disposed outside the bobbin are connected, and ends of the core elements disposed inside the bobbin are spaced apart from each other by the thickness of the bobbin partition, to form a path for magnetic flux.

Abstract: A surface mount pulse transformer has a drum type core including a core and first and second flanges disposed on both ends of the core and installed on a substrate and a primary winding wire and a secondary winding wire wound around the core and provided with an intermediate tap, respectively, wherein first and second terminal electrodes being connected to each of both ends of the primary winding wire and a third terminal electrode for connecting being connected to the intermediate tap of the secondary winding wire are disposed on the surface of the first flange and a fourth terminal electrode being connected to the intermediate tap of the primary winding wire and fifth and sixth terminal electrodes being connected to each of both ends of the secondary winding wire are disposed on the surface of the second flange.

Abstract: There is provided a thin transformer capable of being used in a thin display device such as a liquid crystal display (LCD) device and a light emitting diode (LED) display device. The transformer includes: a bobbin part including a plurality of bobbins, each including a pipe shaped body part having a though-hole formed in an inner portion thereof and a flange part vertically protruding outwardly from both ends of the body part; a core inserted into the through-hole of the bobbin to thereby form a magnetic path; and a coil part including coils each wound around the plurality of bobbins, wherein the bobbin part includes an outer bobbin and an inner bobbin inserted into the through-hole of the outer bobbin to thereby be coupled thereto, and the flange part of the bobbin part includes at least one insulating rib protruding from an outer surface thereof in order to reinforce strength thereof.

Abstract: There are provided a thin transformer capable of being used in a thin display device such as a liquid crystal display (LCD) device, a light emitting diode (LED) display device, and a flat panel display device including the same. The transformer includes: a bobbin part including inner and outer bobbins each including a pipe shaped body part having a though-hole formed in an inner portion thereof and a flange part protruding outwardly from both ends of the body part; coils respectively wound around the inner and outer bobbins; and a core electromagnetically coupled to the coils to thereby form a magnetic path, wherein the inner bobbin is inserted into the through-hole of the outer bobbin to thereby be coupled to the outer bobbin and at least one of the inner and outer bobbins includes the flange part having a width larger than a thickness of the body part.

Abstract: There are provided a thin transformer capable of being used in a thin display device such as a liquid crystal display (LCD) device, a light emitting diode (LED) device, and a flat panel display device including the thin transformer. The transformer includes a bobbin part including inner and outer bobbins each including a pipe shaped body part having a though-hole formed in an inner portion thereof and a flange part protruding outwardly from both ends of the body part; coils respectively wound around the inner and outer bobbins; and a core electromagnetically coupled to the coils to thereby form a magnetic path, wherein the outer bobbin includes a support part formed at the flange part formed at an upper end of the body part of the outer bobbin so as to cover a portion of the through-hole, and the inner bobbin is coupled to the outer bobbin while having one end supported by the support part.

Abstract: There are provided a thin transformer capable of being used in a slim display device such as a liquid crystal display (LCD) device and a light emitting diode (LED) display device, and a flat panel display device including the same. The transformer includes: a bobbin part including a plurality of bobbins, each including a pipe shaped body part having a though-hole formed in an inner part thereof and a flange part protruding outwardly from both ends of the body part; coils respectively wound around the bobbins; and a core electromagnetically coupled to the coils to thereby form a magnetic path, wherein at least one of the bobbins includes a coil skip part which is a route through which lead wires of the coil skipped through the flange part is disposed on an outer surface of the flange part.

Abstract: There is provided a thin transformer capable of being used in a thin display device such as a liquid crystal display (LCD) device and a light emitting diode (LED) display device. The transformer includes: a bobbin part including a plurality of bobbins, each including a pipe shaped body part having a though-hole formed in an inner portion thereof, a flange part vertically protruding outwardly from both ends of the body part, and external connection terminals protruding from one side of a lower flange part formed at a lower end of the body part; a core inserted into the through-hole of the bobbin to thereby form a magnetic path; and a coil part including coils each wound around the plurality of bobbins, wherein the bobbin part includes an inner bobbin and an outer bobbin, and the inner bobbin is coupled to the outer bobbin such that the external connection terminals of the inner bobbin and the external connection terminals of the outer bobbin are opposed to each other.

Abstract: An inductor device is described. The inductor device includes a core comprising two core sections, at least one gap defined between the two core sections, and at least one cast coil and fringe shield assembly. The at least one cast coil and fringe shield assembly includes a conductor winding and a fringe shield sealed within an insulator. The at least one cast coil and fringe shield assembly is configured to at least partially surround portions of the two core sections.

Abstract: An improved planar magnetic structure in which the voltage gradient between core and windings is reduced by shields disposed between the one or more legs of the core and the windings and extending through the PWB layers; vias are offset to permit them to be contained within the path of the winding; and the induced magnetic and eddy currents intrinsic to interstitial shield layers are reduced by configuring the shield conductors with pairs of courses with opposite and offsetting current propagation.

Abstract: A winding arrangement for a transformer or for a reactor is provided. The winding arrangement includes an annular winding cover part disposed on the front face of a winding, wherein a side surface of the winding cover part overlaps a front surface of the winding, wherein the annular winding cover part is designed to be magnetically conductive at least in a partial area and comprises a convex side surface facing away from the winding.

Abstract: It is an objective of the present invention to provide a highly adhesive unsaturated polyester resin composition for fixing or immobilizing coils. There is provided an unsaturated polyester resin composition for adhesion of a coil, which includes the ingredients of: A) an unsaturated polyester resin and/or a vinyl ester resin; B) a monomer including a vinyl group as a polymerizable substituent at at least one end thereof; C) an isocyanate; and D) a polymerization initiator.

Abstract: A method includes forming a winding structure from a single sheet of electrically conductive material, where the winding structure includes a winding base and multiple winding extensions extending from the winding base as a continuous piece of the electrically conductive material. The multiple winding extensions include a base portion that extends from the winding base along a first face of a fully assembled magnetic core, a wrapping portion that extends from the base portion along a second face of the fully assembled magnetic core, and a connection portion that extends from the wrapping portion along a third face of the fully assembled magnetic core, the connection portion comprising an electrical connection surface. The base portion, the wrapping portion, and the connection portion of each winding extend from the winding base such that the integrated windin structure is shaped for placement over the full assembled magnetic core in a single motion.

Abstract: A coil component, in which a space on an outer periphery of a winding interposed between a pair of flange portion is coated with a resin with magnetic powder, has a problem of long-term reliability that a thermosetting resin expands and contracts due to change in a temperature and the flange portions are fatigued to be broken. An object of the present invention is to provide the coil component of which core is hardly broken even when the resin with magnetic powder expands and contracts and a method of manufacturing the same.

Abstract: An inductor includes a magnetic body and a conductive coil received in the magnetic body. The conductive coil receives a magnetic core. The conductive coil includes two terminals exposed outside of the magnetic body. A vent extends through the magnetic core and is spaced from the conductive coil. The vent extends through two opposite sides of the body, forming a path for ambient air. The magnetic body and the magnetic core are preferably integrally formed as a single and inseparable component of the same material.

Abstract: A coil component includes a first coil winding wound around a first axis, a second coil winding wound around a second axis and juxtaposed to the first coil winding, a connecting member for electrically connecting second terminals that are one end of the first coil winding and one end of the second coil winding, and a heat conductive member mounted on the connecting member and having electrical insulation properties and heat conductivity. The first and second coil windings are each wound such that magnetic flux is generated by a current flowing through the first and second coil windings to pass through an opening of the first coil winding and through an opening of the second coil winding in an opposite direction to the direction passing the opening of the first coil winding. Accordingly, heat generated in the first and second coil windings is dissipated from the heat conductive member.

Abstract: Primary and secondary coils are provided in the first through section and a coil group is also provided in the second through section. Hence, the surface area over which the coil group extends within a plane which is perpendicular to the through sections is greater than in the case where all of the coils are provided in a single through section. The surface area which is not covered by the magnetic body cores of the platelike members increases. In cases where the surface area of the members is large, the heat radiation characteristic is enhanced. Hence, the cooling efficiency of the transformer improves. In cases where there is a plurality of coil groups which are magnetically coupled to one another in particular, because it is difficult to move the heat produced in the plurality of coil groups through heat conduction, heat transfer, or heat radiation, a heat radiation structure of this kind is effective.

Abstract: A fluorescent-lamp-driving device contains a driving control circuit that receives direct current power voltage and a lamp control signal for performing drive control on fluorescent lamps and converts the direct current power voltage to alternating current power voltage, and a transformer containing a winding at its primary side and windings for driving a heater and for maintaining discharge at its secondary side. The alternating current power voltage is supplied to heaters of the fluorescent lamps at their high electric potential side. The driving control circuit increases the frequency of the alternating current power supply to a frequency thereof in which voltage of the fluorescent lamps is equal to a discharge start voltage of the fluorescent lamps or less based on the lamp control signal at a period of starting-up time of the fluorescent lamps.

Abstract: A multi-phase coupled inductor includes a magnetic core formed of a powder magnetic material and first, second, third, and fourth terminals. The coupled inductor further includes a first winding forming at least one turn and at least partially embedded in the core and a second winding forming at least one turn and at least partially embedded in the core. The first winding is electrically coupled between the first and second terminals, and the second winding electrically is coupled between the third and fourth terminals. The second winding is at least partially physically separated from the first winding within the magnetic core. The multi-phase coupled inductor is, for example, used in a power supply.

Abstract: An M phase coupled inductor includes a magnetic core including a first end magnetic element, a second end magnetic element, and M legs disposed between and connecting the first and second end magnetic elements. M is an integer greater than one. The coupled inductor further includes M windings, where each winding has a substantially rectangular cross section. Each one of the M windings is at least partially wound about a respective leg.

Abstract: A coil-type electronic component has a coil inside or on the surface of its base material and is characterized in that: the base material is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; this oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via this oxide layer.

Abstract: Miniaturized magnetic components for electronic circuit board applications include enhanced magnetic composite sheets facilitating increased direct current capacity and higher inductance values. The components may be manufactured using relatively simple and straightforward lamination processes.

Abstract: A transformer for reducing the electromagnetic interference (EMI) effect is disclosed. The transformer includes a bobbin; a magnetic core assembly partially sleeved by the bobbin; a first primary winding coiled around the bobbin; a secondary winding coiled on the first primary winding; and a first shielded element disposed between the first primary winding and the secondary winding for disconnecting the EMI transmission from the first primary winding to the secondary winding. The first primary winding includes a first winding portion and a second winding portion, and the first winding portion has larger EMI comparing to the second winding portion. The first winding portion of the first primary winding is adjacently disposed to the magnetic core assembly for shielding the EMI of the first primary winding by using the magnetic core assembly.

Abstract: An inductor includes a core formed of a magnetic material and a foil winding wound at least partially around or through at least a portion of the core. A first end of the winding extends away from the core to form an extended output tongue configured and arranged to supplement or serve as a substitute for a printed circuit board foil trace. A second end of the winding forms a solder tab. At least a portion of the extended output tongue and the solder tab are formed at a same height relative to a bottom surface of the core. Another inductor includes a core formed of a magnetic material, a winding wound at least partially around or through at least a portion of the core, and a ground return conductor attached to the core. The core does not form a magnetic path loop around the ground return conductor.

Abstract: A variable inductor comprises one or more magnetic cores providing magnetic flux paths. An inductor coil is wound around one or more inductor sections of the one or more magnetic cores. An inductor magnetic flux flows through one or more closed flux paths along the inductor sections of the magnetic core. A control coil is wound around one or more control sections of the one or more magnetic cores. A control magnetic flux flows through one or more closed flux paths along the control sections of the magnetic core. Under this arrangement, the inductor magnetic flux substantially does not flow through the control sections of the magnetic core and the control magnetic flux substantially does not flow through the inductor sections of the magnetic core. The closed flux paths associated with the inductor magnetic flux and the closed flux paths associated with the control magnetic flux share one or more common sections of the magnetic core not including the control sections and inductor sections.

Abstract: A transformer includes the first iron core having a plurality of legs arranged spaced apart from each other; a plurality of high-voltage side coils wound around the plurality of legs, respectively, and receiving a common single-phase AC power; and a plurality of low-voltage side coils provided corresponding to the high-voltage side coils, magnetically coupled to the corresponding high-voltage side coils, and wound around the plurality of legs, respectively. The high-voltage side coils and the corresponding low-voltage side coils constitute a plurality of coil groups. The transformer further includes the second iron core provided between the coil groups adjacent to each other.

Abstract: Magnetic structures for use in components utilized in switched mode power supplies can be combined to provide space and cost savings. Portions of magnetic cores can be utilized to form more than one component and/or separate magnetic cores can be combined into a single core. Further, a layer of material that has a higher flux density saturation point than the core and that is lower in permeability than the core (but higher than that of air) can be placed adjacent to the air gap in a core to decrease the magnetic flux passing through the vicinity surrounding the core so as to reduce EMI. A differential-mode choke and a separate common-mode choke can be combined onto a single core. An extra leg for a PFC choke core can be added to an isolation transformer core to form a single combined core. A pair of E-E core structures can be combined into a single core structure such as could be used to combine a pair of separate PFC chokes into an integrated pair of PFC chokes.

Abstract: Disclosed is a wound iron core (3) for a static apparatus in which magnetic paths in the inside of the wound iron core are subdivided to improve iron core characteristics. The iron core (3) is configured by using two or more kinds of magnetic materials (11 to 14) with different magnetic permeabilities to form laminated blocks with single plates or a plurality of laminated plates and by alternately arranging the laminated blocks with different magnetic permeabilities from the inner circumference. An iron core material (14) with large magnetic permeability out of iron core materials with different magnetic permeabilities is arranged on the inner circumference side. Further, when the iron core materials with different magnetic permeabilities are alternately arranged, the iron core materials (11) with the same magnetic permeability are configured to gradually change in thickness to ease an excessive magnetic flux density distribution in the iron core.

Abstract: A soft magnetic material includes a plurality of magnetic particles, a binder, and a lubricant. The binder binds the plurality of magnetic particles. The lubricant is contained in the aggregate of the bound magnetic particles, and has a melting point less than or equal to 100° C. The method of producing a soft magnetic material includes the steps of forming an additive by mixing a binder and a lubricant including fatty acid monoamide, and binding the plurality of magnetic particles by the additive.

Abstract: Sensor for measuring electrical parameters in a high voltage environment comprising a high voltage side (4) for connection to high voltage conductors, a low voltage side (6) for connection to low voltage power supply and measurement signal control circuitry, a measurement signal circuit (16), and a power supply circuit (14), and at least one isolating transformer (18, 20) for transmission of electrical power supply and/or measurement signals between the low voltage side and the high voltage side. The isolating transformer comprises at least a first and a second transformer core (28), a transformer coil (33) on a circuit board around a branch (27) of the transformer core on the high voltage side and a transformer coil (32) on a circuit board around a branch (29) of the transformer core on the low voltage side, the isolating transformer further comprising an intermediate coil (36) encircling at least one branch of each said at least two transformer cores.

Abstract: A winding assembly for a transformer includes a wire winding and a sheet winding. The wire winding includes a spirally wound insulated wire and the sheet winding includes a metallic winding sheet that forms a single turn winding. Instead of winding the wire winding on a bobbin, sleeve or the like, the wire winding is attached directly to a surface of the winding sheet by means of a self-bonding technique.

Abstract: A bobbin of a transformer includes a main body and plural connecting bases. The main body has two side plates. The two side plates are respectively disposed on two opposite sides of the main body. A winding section is defined within the two side plates for winding a winding coil. The plural connecting bases are disposed on the two opposite sides of the main body and connected with the side plates. Plural wire-arranging grooves are formed in a bottom surface of each connecting base. Each side plate has an inner recess in communication with a corresponding wire-arranging groove. An initial winding segment of the winding coil is accommodated within the wire-arranging groove and the inner recess, thereby preventing the winding coil from rubbing against the initial winding segment during the winding coil is wound on the winding section.

Abstract: A coil module comprises a circular core and a winding is provided. The circular core comprises an outer circular portion and an inner circular portion. The winding is wound around the outer circular portion in a single-layer configuration and around the inner circular portion in a multi-layer configuration. The coil module comprises a first thickness after the winding is wound around the outer circular portion and comprises a second thickness after the winding is wound around the inner circular portion, wherein the first thickness is greater than or equal to the second thickness.

Abstract: An inductor winding includes first, second, and third arms, a middle portion extending between and connected to at least two of the first, second, and third arms and arranged to support a winding core mounted thereon, and first, second, and third legs extending downwardly from the first, second and third arms, respectively, and arranged to be mounted on a circuit board. The first, second, and third legs are arranged to provide three-point contact with the circuit board, and the inductor winding is arranged to provide a space between a bottom surface of the winding core mounted on the middle portion and an upper surface of electronic components mounted on the circuit board.

Abstract: Low-cost, high performance woven conductors and associated inductive apparatus, and methods for manufacturing and utilizing the same. In one embodiment, an eight (8) conductor wiring strand is used that results in a pattern in which a given conductor resides, on average, at an equal position throughout the braid grouping as any other conductor within the wire strand over a given length. Such a configuration enhances coupling among the conductors, which minimizes deleterious parasitic effects such as leakage inductance and distributed capacitance. Segmented woven wiring strands are also disclosed which are composed of both woven and non-woven portions. Examples of devices which can utilize the woven conductors include, without limitation, bobbins or other formers, headers, encapsulated electronic packages, modular jacks, form-less inductive devices and transmission lines.

Abstract: A transformer 10 has a first core CR1, a second core CR2, a first transformer primary winding W1, a coil 45, a coil 46 and a coil 47. The second core CR2 is integrally formed with the first core CR1. The first transformer primary winding W1 is wound onto the first core CR1. The coil 45 is wound onto the first core CR1 and forms a transformer T1 together with the first transformer primary winding W1. The coil 46 is wound around the first core CR1 and forms a transformer T2 together with the first transformer primary winding W1. The coil 47 is connected to the coil 45 and coil 46 and forms an output coil using the second core CR2 as a magnetic core.

Abstract: A biased gap inductor includes a first ferromagnetic plate, a second ferromagnetic plate, a conductor sandwiched between the first ferromagnetic plate and the second ferromagnetic plate, and an adhesive between the first ferromagnetic plate and the second ferromagnetic plate, the adhesive comprising magnet powder to thereby form at least one magnetic gap. A method of forming an inductor includes providing a first ferromagnetic plate and a second ferromagnetic plate and a conductor, placing the conductor between the first ferromagnetic plate and the second ferromagnetic plate, adhering the first ferromagnetic plate to the second ferromagnetic plate with a composition comprising an adhesive and a magnet powder to form magnetic gaps, and magnetizing the inductor.

Abstract: An apparatus, system, and method are disclosed for combining multiple windings on a magnetic core. An integrated winding structure has a winding base and multiple winding extensions. The multiple winding extensions and the winding base are formed from a single sheet of electrically conductive material. Each of the multiple winding extensions has a base portion that extends from the winding base, a wrapping portion that extends from the base portion, and a connection portion that extends from the wrapping portion. The connection portions and the winding base each have electrical connection surfaces. Each of the multiple winding extensions forms one or more windings on the magnetic core.

Abstract: A wire-wound coil has a characteristic impedance that can be flexibly adjusted and can be prevented from varying undesirably. In the coil of the present invention, a primary wire part 18A and a secondary wire part 18B are wound around the surface of a core portion 14 so as to be separated from each other by a fixed distance. At the same time, at least one portion the secondary wire part 18B in a prior turn section 19X and at least one portion of the primary wire part 18A in a subsequent turn section 19Y are in close contact with each other, wherein the wire parts 18A and 18B are wound in different turns and are adjacent to each other on the same surface of the core portion 14. A method for manufacturing the wire-wound coil is also disclosed.

Abstract: A transformer including; a bobbin, a coil wound to the bobbin, a core inserted within the bobbin and a soldering pin disposed connected to the bobbin, wherein the soldering pin has at least one first hole.

Abstract: The present invention discloses an inductor with a ferromagnetic metal film, which comprises an upper magnetic material layer, a lower magnetic material layer, and a metallic conducting wire. The metallic conducting wire is sandwiched between the upper magnetic material layer and the lower magnetic material layer. Either the upper magnetic material layer or the lower magnetic material layer is a ferromagnetic metal film. The ferromagnetic metal film can effectively converge the magnetic fluxes and enhance the inductance of the inductor. Thus is reduced the thickness of the upper magnetic material layer or lower magnetic material layer and achieved a thin drum inductor.

Abstract: A reactor part includes at least a winding and a magnetic substance core, in which the core includes a pair of winding portions around each the winding is wound, and a non-winding portion around which no winding is wound, wherein a cross-sectional area in a direction orthogonal to a magnetic path of the non-winding portion of the core is made smaller than a cross-sectional area in a direction orthogonal to a magnetic path of the each of winding portions.

Abstract: This document discusses, among other things, an inductive component that can include a core having two portions: (1) a first portion composed of a first material having a first magnetic saturation level; and (2) a second portion composed of a second material selected to provide inductance for the inductive component when an external magnetic field is greater than the first magnetic saturation level. In an example, the first portion can be composed of a material having a relatively low magnetic saturation level (e.g., a ferrite), and the second portion can be composed of a material having a relatively high magnetic saturation level (e.g., a high permeability iron alloy).

Abstract: Disclosed is an electronic component, especially a coil with a coil core, in which the turns of the coil winding are spaced apart from each other at least at one point in the longitudinal direction of the coil. A plastic retaining element which overlaps both the coil core and at least the two adjacent turns of the coil winding in a longitudinal direction is sprayed on in the area of said point, whereby a connection between the coil core and the coil winding is created at the same time. The retaining element can be sprayed around a closed circumference of the coil while covering only a portion of the coil in the longitudinal direction thereof. Preferably, the retaining element is placed approximately in the center relative to the longitudinal extension of the coil.