WO2020070309A1 - Agencement de noyau magnétique, dispositif inductif et dispositif d'installation - Google Patents

Agencement de noyau magnétique, dispositif inductif et dispositif d'installation

Info

Publication number
WO2020070309A1
WO2020070309A1 PCT/EP2019/076961 EP2019076961W WO2020070309A1 WO 2020070309 A1 WO2020070309 A1 WO 2020070309A1 EP 2019076961 W EP2019076961 W EP 2019076961W WO 2020070309 A1 WO2020070309 A1 WO 2020070309A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic core
magnetic
core
gap
equal
Prior art date
Application number
PCT/EP2019/076961
Other languages
English (en)
Inventor
Rolf DISSELNKÖTTER
Jimmy Kjellsson
Adrian Hozoi
Original Assignee
Abb Schweiz Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Schweiz Ag filed Critical Abb Schweiz Ag
Priority to EP19779919.0A priority Critical patent/EP3861562B1/fr
Publication of WO2020070309A1 publication Critical patent/WO2020070309A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps

Definitions

  • aspects of the invention relate to a magnetic core arrangement, in particular a transformer core arrangement, comprising at least two stacked cores forming a so called composite core, in particular ring-like cores, each comprising one or more core segments.
  • an inductive device such as an inductor or transformer, including at least one core arrangement, and an installation device including at least one of said inductive devices, in particular a transformer and/or inductor.
  • a magnetic core typically includes one or more pieces of ferromagnetic material with high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical, and magnetic devices.
  • Inductive devices such as inductors or transformers using a magnetic core are known and widely used in electrical equipment. Modem electrical equipment is required to provide increasingly better performance, functionality, operation range, and robustness, leading to technical challenges.
  • modem electrical equipment requires steadily enhanced performance and accuracy over wider AC operating currents and frequency.
  • wider nominal current ranges are being introduced and multiple functionalities such as protection, control, monitoring and metering are to be fulfilled with one device.
  • Wider operating frequency range may be required in order to deal with various rated frequencies, high frequency harmonics, and low frequency or high frequency signals caused by fault conditions.
  • typical rated frequencies in electrical power and distribution equipment are 16 7 Hz, 50 Hz, 60 Hz, but harmonics well above 1 kHz maybe present.
  • Transitory signals with very low frequency content, e.g. below 5 Hz, or very high frequency content, e.g. above 10 kHz, are possible in case of fault conditions.
  • Wide operating frequency range may also be required in case of power drives and converters.
  • DC currents or low frequency currents may be present in AC power lines because of the type of equipment connected to the grid or because of fault conditions such as short circuits.
  • Very large transitory currents with very low frequency content, e.g. below 5 Hz, or very high frequency content, e.g. above 10 kHz, are possible in case of fault conditions or switching.
  • modem power grids should deal with steadily higher DC currents caused by increased usage of equipment such as static VAR compensation, AC to DC power converters, and DC to AC power converters.
  • the present application may use the term DC to refer to all signals with very low frequency, e.g. below 5 Hz.
  • DC signals are limiting the AC operating range of inductive components with ferromagnetic cores and may even cause them to fail.
  • Transformers can be particularly sensitive to DC signals as even tiny DC currents can cause them to saturate.
  • modem inductive components are often required to be able to operate under moderate DC currents caused by modem equipment or under severe DC currents caused by fault conditions.
  • inductive devices are desired to provide excellent AC performance over a wide frequency range but also to withstand high DC currents while providing acceptable AC performance.
  • Such transformers are desired to accurately measure AC currents comprised in a very wide range, possibly from 1 mA to 1000 A, and from 16 Hz to 10 kHz. Furthermore, they are also desired to withstand comparably high DC currents without saturating.
  • the current transformers are desired to be ideally compact and lightweight.
  • Magnetic cores are described herein using effective permeability values, also expressed relative to the permeability of vacuum.
  • the effective permeability of a magnetic core may be employed to Actively represent the core as it was made from a homogenous material occupying the full volume of the core.
  • the effective permeability may be representative for the magnetic core and it is usually not identical to the penneability of the pure ferromagnetic material but it may be also influenced by the construction of the core.
  • the effective permeability may depend on multiple factors related to the construction of the core such as the orientation of the magnetic material, filling ratio, presence of gaps, mechanical stresses or strains, etc.
  • the effective permeability can be a practical way to compare cores fabricated using different technologies and/or materials. Experimentally, it can be determined from inductance or hysteresis measurements (B-H curves), without applying corrections related to the construction of the core.
  • Hysteresis measurements are typically employed to also measure other magnetic properties of the core, such as saturation flux density, B s , and residual magnetic flux density, B r .
  • the magnetic properties of the core may be seen as being representative for the core and are usually a result of the construction of the core and of the magnetic properties of the ferromagnetic material(s) employed.
  • composite core including two ferromagnetic cores: one core with very high permeability and one core with moderate permeability.
  • Current transformers with composite cores are known from JPS58216412 and JP5525270, where one of the cores includes at least one gap to lower its effective permeability.
  • the core with high penneability is a non-gapped core.
  • the composite core features thus two operating regimes: at null or weak DC currents, high effective permeability is ensured by the non-gapped core; at increasing DC current, low effective permeability is ensured by the gapped core and the non-gapped core saturates.
  • the relative permeability of the non-gapped core needs to be very high, for example having a value comprised between 20000 and 100000.
  • the permalloy core disclosed in JP5525270 would feature a value of the permeability value in the upper range of the interval.
  • the effective relative permeability of the gapped core needs to be low, e.g. less than 4000.
  • acceptable AC performance under DC currents still needs to be provided, which requires the gapped core to feature a sufficiently large value of the effective relative permeability, e.g. above 400.
  • a small value of the total gap width is thus needed, e.g. less than 0.25 mm.
  • the total gap width is equal to the sum of the width of all gaps, taking usually the mean values, and it is used to generally describe a core with one or more gaps.
  • the width of each gap must be 0.05 mm and cannot be precisely produced using available methods.
  • Fabricating thin gaps with precise width is technically very challenging and the problem becomes increasingly severe as the gap is thinner, for example in the order of 0.1 mm or less.
  • the gap width must be precise and stable over the operating conditions and lifetime of the core in order to ensure reliable and reproducible performance. Practical means to fabricate gaps with precise and thin width, e.g. below 0.25 mm, are not known from state of the art.
  • the composite core has two ring cores fabricated from stacked laminations, such construction being mainly suitable for isotropic ferromagnetic materials with relatively large thickness of the laminations, e.g. above 0.2 mm. This drastically limits the choice of useable materials as practically all ferromagnetic materials featuring low magnetic losses and high saturation magnetic flux density are anisotropic and/or feature thin laminations. Grain- oriented electrical steels, amorphous alloys, and nanocrystalline alloys are thus excluded.
  • the gap of the gapped core is processed involving elastic forces present in the core, resulting in residual strain which is detrimental to the magnetic properties.
  • the non-gapped core is made from permalloy and it features thus limited saturation flux density, B s ⁇ 0.8 T.
  • Composite cores are still facing technical challenges related to optimizing the AC performance and their saturating limit, especially the DC withstand. Providing thin gaps with precise width is one major problem and it becomes increasingly severe as the gap is thinner, for example in the order of 0.1 mm or less. Such practical constraints has made the usage of composite cores unpopular.
  • a magnetic core arrangement according to claim 1 an inductive device, such as an inductor or a current transformer, comprising at least one such magnetic core arrangement according to claim 15, and an installation device according to claim 16 are provided.
  • a current transformer comprising the disclosed core arrangement.
  • An exemplary current transformer may include a primary winding or an opening for a primary winding, and a secondary winding being coupled to the core arrangement.
  • the primary winding and/or the secondary winding are configured to be wound around the magnetic core arrangement as described above.
  • the solid spacer may include and/or is composed of filler particles dispersed in the adhesive.
  • the filler particles can be commonly available filler particles being employed in other technical fields, such as for example as fillers for composite materials, grinding media, or blasting media.
  • the filler particles can be microparticles, microsperes, beads, or grains having with desired tolerances and particle size distributions.
  • the filler particles are microparticles made from an electrically non-conductive material.
  • the microparticles can be dispersed in the adhesive prior to application.
  • the microparticles can be made of and/or include a non-organic material, such assilica, glass, sand, ceramic, or compositions thereof.
  • Silica or ceramic-based microparticles are commonly employed in different technical fields as fillers to be mixed with polymers to produce casting resins and other composite materials featuring improved structural properties.
  • Structural adhesives containing premixed fillers are commercially available or they may be prepared on-site using common adhesive handling equipment.
  • the tern microparticles can be employed to refer to tiny particles having a size, such as an average diameter, ranging from 1 pm to 1000 pm, specifically being equal to or smaller than 1000 pm.
  • the size of the microparticles may range, for example, between 1 pm and 250 pm, Specifically, the microparticles may be equal to or smaller in size than 250 pm.
  • Various techniques exist to measure and/or to characterize the particle size such as laser diffraction, morphological imaging, optical imaging, or microscopy.
  • the first magnetic core can have a higher permeability than the second magnetic core.
  • the first magnetic core can provide a high permeability, achieve good AC performance and low losses and/or the second core can provide a low permeability, achieve a good DC withstand and avoid saturation.
  • the first magnetic core and the second magnetic core can have approximately or almost the same inner and/or outer diameters. Additionally or alternatively, the first magnetic core and the second magnetic core are stacked together to form the composite core. For instance, as depicted e.g. in Fig. 1A, the first magnetic core and the second magnetic core may be stacked together along the axis, in particular the rotary axis. Accordingly, the axis of the composite core and/or of the second magnetic core, can be the direction along which the first magnetic core and the second magnetic core are stacked together. According to embodiments described herein, the first magnetic core and the second magnetic core can be arranged coaxially.
  • the second magnetic core may be formed from two parts and subportions respectively.
  • the second magnetic core has two non-magnetic gaps between the two subportions.
  • the subportions are shaped as half-rings.
  • the two subportions can be of approximately equal size.
  • “approximately equal size” such as when referring to the size of the two subportions, may be understood as being equal in size within manufacturing tolerances and/or in a manner that does not alter the electrical properties of the two subportions with respect to each other by more than 10%, specifically by not more than 5%.
  • the second magnetic core can be cut into two half-cores which are joined such that two non-magnetic gaps are created at the joining interfaces.
  • the half-cores or subportions can be joined by the adhesive and the width of the two non-magnetic gaps can be precisely controlled, e.g. by using the solid spacers.
  • the second magnetic core can be based on a tape-wound core which is cut into two half-cores which are subsequently joint such that two non-magnetic gaps are created at the joining interfaces.
  • the current transformer may include a secondary electrical winding which can be wound on the composite core.
  • the secondary electrical winding can be preferably homogenously distributed over the composite core.
  • the current transformer may be provided with a primary winding or with an opening where a primary conductor may be inserted to serve as a primary winding.
  • a current transformer which includes a primary winding or an opening for a primary winding, and/or a secondary winding.
  • the primary winding and/or the secondary winding can be configured to be wound around a composite core as described herein.
  • the secondary winding can be homogenously distributed over the composite core.
  • the current transformer may include a mechanical casing, fixation(s), electrical contacts and other practical accessories enabling optimum usage and integration of the device.
  • current transformers that are compact and/or provide excellent accuracy over wide AC current range spreading over several decades can be provided.
  • the current transformers described herein can be configured to accurately measure AC currents in a range between 1 mA and 1000 A, and/or to withstand DC currents up to 100 A or even above without saturating.
  • current transformers that are compact and lightweight can be provided.
  • the current transformer can have a composite core including a first magnetic core and a second magnetic core, wherein the first magnetic core and the second magnetic core are beneficially ring shaped, even though other geometries are also possible.
  • the first magnetic core and the second magnetic core may be assembled in concentrical arrangement or stacked arrangement.
  • a stacked arrangement is, e.g., shown in Figs. 1 A and 1 B and may imply that the first magnetic core and the second magnetic core have approximately equal inner and outer diameters.
  • first magnetic core and/or the second magnetic core can be beneficially provided with a polymer coating, such as epoxy.
  • a polymer coating such as epoxy. This ensures a smooth surface suitable for applying the electrical windings without having to enclose the composite core in a case. Avoiding a case can be suitable for minimizing dimensions of the current transformer and/or minimizing a resistance of the secondary winding, which may result in better electrical performance such as accuracy and wider range.
  • the first magnetic core and the second magnetic core can be fixed together by various means, for example using adhesive joining or adhesive tape.
  • a total gap width of the second core portion i.e. the sum of all gaps, can have a value typically of between 0.05 mm and 0.25 mm.
  • the particular value of the total gap width may depend on the specific application and it may be precise and stable over operating conditions in order to ensure reliable results.
  • the installation device can include a network interface for connecting the installation device to a data network, in particular a global data network.
  • the data network may be a TCP/IP network such as Internet
  • the installation device can be operatively connected to the network interface for carrying out commands received from the data network.
  • the commands may include a control command for controlling the installation device to carry out a task such as measuring a current.
  • the installation device is adapted for carrying out the task in response to the control command.
  • the commands may include a status request.
  • the installation device may be adapted for sending a status information to the network interface, and the network interface can then be adapted for sending the status information over the network.
  • the commands may include an update command including update data.
  • the installation device is adapted for initiating an update in response to the update command and using the update data.
  • the data network may be an Ethernet network using TCP/IP such as LAN, WAN or Internet.
  • the data network may comprise distributed storage units such as Cloud.
  • the Cloud can be in form of public, private, hybrid or community Cloud.
  • the present application may provide inductive devices, such as the composite core, transformer and installation unit, having excellent AC performance at low to medium frequencies and that are able to withstand of high DC currents.
  • “withstand of high DC currents” may be understood and/or may imply that acceptable AC performance may be provided even when the device is subjected to high DC currents.
  • FIG. 1 A is a side view of a magnetic core arrangement according to embodiments
  • Fig. 2A is a side view of a magnetic core arrangement according to embodiments
  • Fig. 2B is a top view of the magnetic core arrangement shown in Fig. 2A;
  • Fig. 3A is a side view of a magnetic core arrangement according to embodiments.
  • Fig. 3B is a top view of the magnetic core arrangement shown in Fig. 3 A.
  • Figs. 1A and 1B show a side view and a top view, respectively, of a magnetic core arrangement 100 comprising cores of different effective permeability forming a so called composite core according to embodiments described herein.
  • the magnetic core arrangement 100 according to the disclosed embodiment of figures 1 A and IB comprises two stacked ring-like cores forming a so called composite core primarily made from magnetic material, wherein a first core 110 and a second core 120 having lower effective permeability than the first core and made from and/or including a magnetic material, specifically a ferromagnetic material, are provided.
  • the second core 120 includes a one non-magnetic gap 122, provided in the magnetic path of the second core 120, so as to form at least one semi- or partly ring-like magnetic structure.
  • the nonmagnetic gap 122 is filled partly or totally with a resin such as an adhesive compound, in particular in order to adjust and control the gap width and permeability accordingly and/or to increase structural stability of the core.
  • the non-magnetic gap is provided and/or arranged in the magnetic material of the second core 120, e.g. by cutting or locally removing the magnetic material of the second core 120. Specifically, the non-magnetic gap is provided and/or arranged in the magnetic material of the second core 120 such that it interrupts the magnetic path of the second core 120.
  • a medium may be understood as“magnetic” if the relative value of its magnetic permeability is significantly larger than 1, for example up to orders of magnitude larger than the magnetic permeability of vacuum. Further, a medium may be understood as “non-magnetic” if the relative value of its magnetic permeability is approximately equal to 1 , i.e. it is in the same order of magnitude as the magnetic permeability of vacuum.
  • the non-magnetic gap has a magnetic permeability which is significantly lower than the permeability of the magnetic material of the second core 120.
  • the magnetic permeability of a gapped core such as the second core 120, largely depends on the dimensions of the gap and/or the filling of the gap.
  • the width of the gap mainly determines the effective permeability and remanence of the gapped core.
  • the gap can be provided in a way that the surface normal of the adjacent cross sections of the core and/or gap are oriented in a direction parallel or approximately parallel to the magnetic path of the core. Alternatively, it is also possible to provide the gap at different angles to the magnetic path of the core.
  • the at least one non-magnetic gap 122 is filled by and/or with a resin.
  • the resin can be an adhesive or adhesive compound. Accordingly, whenever“adhesive” or“adhesive compound” is mentioned herein it can be replaced by“resin”, unless it is technically not meaningful.
  • the filling of the at least one non- magnetic gap 122 by and/or with a resin can allow a precise control of a width of the at least one non-magnetic gap 122. In particular, the at least one non-magnetic gap 122 can be reliably formed with an intended width, specifically with a small width.
  • the at least one non-magnetic gap 122 and/or the width of the at least one non-magnetic gap 122 can be precisely set to obtain a desired DC performance in practice.
  • the at least one non-magnetic gap 122 can be configured to obtain moderate AC performance and high DC withstand. In this way, an optimum balance between AC performance and DC withstand is provided for the magnetic core arrangement.
  • the first magnetic core can be optimized for excellent AC accuracy and also for moderate DC withstand and/or the second magnetic core can be optimized for moderate AC accuracy and strong DC withstand.
  • the first magnetic core 110 can have a higher permeability than the second magnetic core 120.
  • the first magnetic core 110 can provide a high permeability, achieve good AC performance and low losses and/or the second core 120 can provide a low permeability, achieve a good DC withstand and avoid saturation. Accordingly, an optimum balance between AC performance and DC withstand can be provided for the magnetic core arrangement 100 in practice.
  • the magnetic core arrangement or so called composite core 100 can include two magnetic cores, i.e. the first magnetic core 110 and the second magnetic core 120, featuring different inductance values and saturation limits.
  • the first magnetic core 110 can provide high inductance and can be an excellent performer under predominantly AC currents, while the second magnetic core 120 can provides lower inductance and can be harder to saturate under DC currents.
  • the first magnetic core 110 and the second magnetic core 120 can be primarily made from magnetic material, such as ferromagnetic material, with high relative permeability.
  • the first magnetic core 110 and/or the second magnetic core 120 can beneficially have a tape-wound construction in order to provide optimal combination between compact size, high permeability, and low losses.
  • the first magnetic core 110 can be provided with sufficiently high permeability in order to ensure excellent AC performance but specifically not excessively high in order to withstand low levels of DC current without saturating. For typical applications, optimum tradeoffs can be achieved when its effective permeability has a value between 20000 and 60000.
  • the first magnetic core 110 can also have a sufficiently high saturation magnetic induction, Bs, above 0.8 T, and/or low remanence Br/Bs ⁇ 0.3, in order to reach sufficiently large operation range.
  • cores made from nanocrystalline alloys similar to those described for example in EP0271657, are available with both high permeability and exceptionally low losses, and can be used as the first magnetic core 1 10.
  • the first magnetic core 110 may have an effective relative permeability of equal to or greater than 20000 and/or of equal to or smaller than 60000. Additionally or alternatively, the first magnetic core 110 may have a remanence flux density being lower, e.g. less than 30%, than a saturation flux density.
  • the first magnetic core can be provided with a high enough permeability in order to ensure excellent AC performance but not excessively high in order to withstand low levels of DC current without saturating.
  • the at least one non-magnetic gap 122 can be provided by a cut extending in radial direction and wherein the intersection planes are aligned almost orthogonal to the magnetic path of the core.
  • the gap width may be between 0.05 mm and 0.1 mm, however, other values between 0.03 mm and 0.25 mm are possible.
  • the width of the at least one non-magnetic gap 122 should be precise and stable in order to ensure reliable and reproducible performance of the core.
  • the second magnetic core 120 can have an effective relative permeability of equal to or greater than 400 and/or of equal to or smaller than 4000. Additionally or alternatively, the second magnetic core 120 can have a magnetic saturation flux density being equal to or larger than 1.5 T.
  • the second magnetic core 120 can be provided with an effective permeability which is low enough in order to prevent the magnetic core arrangement 100 from saturating when subject to high DC currents but still sufficient to allow reproducing AC signals with acceptable accuracy.
  • the second magnetic core 120 can also have a high saturation magnetic induction, B s , and/or a low remanence, B r .
  • the second magnetic core 120 can have a saturation magnetic induction, B s , larger than 1.5 T, remanence B r /B s ⁇ 0.3, and/or effective relative permeability which can be between 400 and 4000 depending on the particular requirements of the application.
  • the value of the effective relative permeability can be precisely controlled in order to ensure reliable and reproducible results.
  • the magnetic losses of the second magnetic core 120 can be kept low in order to provide acceptable AC performance.
  • Grain-oriented electrical steel may provide the highest saturation magnetic induction out of ferromagnetic core materials available with moderately low magnetic losses.
  • the first magnetic core 110 and/or the second magnetic core 120 can be made from and/or include grain-oriented electrical steel.
  • grain-oriented electrical steel is an anisotropic material, a magnetic properties of grain-oriented electrical steel can be best exploited in tape-wound core constructions resulting in compact dimensions but also maximum saturation magnetic induction, B s > 1.8 T, and minimum losses.
  • the adhesive can include the solid spacer 124 defining the at least one non-magnetic gap 122.
  • the solid spacer 124 can be inserted into at least one of the at least one non-magnetic gaps 122.
  • the solid spacer can be made from and/or include an electrically non- conductive material.
  • “defining the at least one nonmagnetic gap” can be understood as providing the at least one non-magnetic gap 122 with a desired width.
  • the solid spacer can further facilitate forming of the at least one non-magnetic gap 122 a with an intended width.
  • a width of the at least one non-magnetic gap can be produced with a simple and cost effective assembly process. Furthermore, the stability of the adhesive in terms of temperature, humidity, and ageing can be improved.
  • Controlling a width of the at least one non-magnetic gap of the second magnetic core using an adhesive filled with microparticles can thus be a convenient manufacturing process, easy to apply using commonly available equipment and materials. Selecting the appropriate microparticles may allow precise control of the gap width.
  • the adhesive can be an epoxy. Epoxy adhesives filled with non-organic microparticles are known to provide high quality structural bonding. However, other adhesive are also encompassed, e.g. based on polyurethanes.
  • non-organic fillers stabilize the structural properties of the adhesive resulting in improved stability of the gap width versus temperature, humidity, and ageing.
  • the gap width can be thus precisely maintained over wide operating climatic conditions and the lifetime of the device.
  • Figs. 3 A and 3B show an exemplary magnetic core arrangement forming a composite core 100 having at least two gaps l22a, l22b, specifically with two gaps l22a, 122b, formed in the second magnetic core 120.
  • the second magnetic core 120 can be cut into two pieces, such as two half-cores.
  • the two core pieces can be joined using the resin to provide adequate binding and to produce two non-magnetic gaps 122a, 122b at the joining interfaces.
  • the width of one or of both gaps 122a, 122b can be conveniently controlled using appropriate spacer(s) or microparticles as described herein.
  • the total width of the gaps 122a, 122b i.e.
  • the gap(s) may also cause a self-demagnetization effect of the core which can reduce the remanence, Br, which typically becomes very low, for example Br/Bs ⁇ 0.1. Excellent reproducibility and operating range of the core may thus be ensured in practice.
  • the second core beneficially also has a high saturation magnetic induction, Bs.
  • the magnetic losses of the second core can be beneficially low in order to provide acceptable AC performance.
  • Grain-oriented electrical steel may provide the highest saturation magnetic induction out of ferromagnetic core materials available with moderately low magnetic losses. Because it is an anisotropic material, its magnetic properties are best exploited in tape-wound core constructions resulting in compact dimensions but also high saturation magnetic induction, Bs > 1.8 T, and minimum losses.
  • the second magnetic core can thus be finely optimized to provide the desired response when DC currents are present.
  • Setting the width of at least one non-magnetic gap of the second core using a resin possibly filled with microparticles may be a convenient manufacturing process, easy to apply based on commonly available equipment and materials.
  • Suitable microparticles can be selected to precisely control the width of the gap(s) and to ensure great stability versus operating conditions and aging.
  • the second magnetic core 120 can be provided with a polymer coating such as epoxy.
  • the polymer coating can be applied before forming the at least one non-magnetic gap 122a, 122b. Additionally or alternatively, the polymer coating can be applied after forming the at least one non-magnetic gap 122a, 122b, but before filling the at least one non-magnetic gap 122a, 122b with the adhesive or after filling the at least one non-magnetic gap 122a, 122b with the adhesive.
  • edges of the at least one non magnetic gap 122a, 122b can be provided with an additional coating or protection layer for providing a smooth surface. For example, local coating or adhesive tapes may be applied.
  • Figs. 1 A to 3B show at least one non-magnetic gap l22a, 122b that particularly extends from one end side of the second magnetic core 120 to an opposite end side of the second magnetic core 120.
  • the at least one non-magnetic gap 122a, l22b extends from one end side of the second magnetic core 120 to an opposite end side of the second magnetic core 120 in a radial direction of the second magnetic core 120, i.e. the at least one non-magnetic gap l22a, 122b spans the full extension and/or cross-section of the second magnetic core 120 in the radial direction.

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  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

La présente invention concerne un agencement de noyau magnétique (100) pour un dispositif inductif. L'agencement de noyau magnétique comprend : un premier noyau magnétique (110) ; et un second noyau magnétique (120), le second noyau magnétique (120) comprenant au moins un entrefer non magnétique (122, 122a, 122b) s'étendant dans un plan de section transversale du second noyau (120) et étant partiellement ou totalement rempli d'une résine.
PCT/EP2019/076961 2018-10-05 2019-10-04 Agencement de noyau magnétique, dispositif inductif et dispositif d'installation WO2020070309A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19779919.0A EP3861562B1 (fr) 2018-10-05 2019-10-04 Agencement de noyau magnétique, dispositif inductif et dispositif d'installation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18198914.6 2018-10-05
EP18198914 2018-10-05

Publications (1)

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WO2020070309A1 true WO2020070309A1 (fr) 2020-04-09

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