EP3979272A1 - Filtre d'absorption, ainsi que procédé de fabrication d'un tel filtre - Google Patents

Filtre d'absorption, ainsi que procédé de fabrication d'un tel filtre Download PDF

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Publication number
EP3979272A1
EP3979272A1 EP21200736.3A EP21200736A EP3979272A1 EP 3979272 A1 EP3979272 A1 EP 3979272A1 EP 21200736 A EP21200736 A EP 21200736A EP 3979272 A1 EP3979272 A1 EP 3979272A1
Authority
EP
European Patent Office
Prior art keywords
housing
casting compound
passage
filter arrangement
toroidal
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP21200736.3A
Other languages
German (de)
English (en)
Inventor
Thorsten PEMSEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Epa GmbH
Original Assignee
Epa GmbH
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 Epa GmbH filed Critical Epa GmbH
Publication of EP3979272A1 publication Critical patent/EP3979272A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/22—Cooling by heat conduction through solid or powdered fillings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/005—Impregnating or encapsulating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI filter

Definitions

  • the invention relates to a filter arrangement, in particular an absorption filter for the absorption of high-frequency differential currents in phase conductors of a supply line of an electric motor, comprising a housing with at least one toroidal core which can be electromagnetically coupled to at least one of the phase conductors, the at least one toroidal core being in the housing by means of a casting compound cast as well as a method for producing a filter arrangement, in particular an absorption filter for the absorption of high-frequency differential currents in phase conductors of a supply line of an electric motor, at least one toroidal core being arranged in a housing so that it can be electrically coupled to the at least one phase conductor of the supply line of the electric motor is, wherein the housing with the at least one toroidal core arranged therein is cast by means of a casting compound,
  • a filter arrangement of the type mentioned above is from JP H03 102 808 A famous.
  • the filter assembly includes a housing having at least one toroidal core electromagnetically coupled to at least one phase conductor.
  • the at least one ring core is cast together with the at least one phase conductor in the housing using a casting compound.
  • the housing, toroidal core and phase conductor form a unit. The replacement of the phase conductors or the use of the filter arrangement with different phase conductors is not provided.
  • the US 6,218,913 B1 relates to a filter assembly having a housing with at least one toroidal core.
  • Phase conductors are routed through the at least one ring core.
  • the phase conductors are mechanically connected to one another so that relative movement to the toroidal cores is impossible.
  • the ring cores and the phase conductors are cast in the housing with a casting compound. The phase conductors are thus fixed in the housing.
  • DT 27 04 337 A1 relates to an overcurrent protection device for an AC motor with at least one current transformer, the iron core of which encloses at least part of a connection line connecting the motor to an AC power source.
  • the overcurrent protection device includes a housing having three spaced holes or windows extending between the side walls. The bores are formed by tubes which extend between respective openings and in the side walls and which pass through the circular openings of the toroidal cores of the current transformers.
  • the U.S. 2015/0244339 A1 relates to a filter arrangement comprising a housing with at least one ring core which is electromagnetically coupled to electrical conductors.
  • the electrical conductor has ends connected to terminals of the housing.
  • DT 25 43 977 A1 relates to a method for producing channels in castings, in particular cooling channels in resin-impregnated and resin-cast normal and superconducting coils with a winding core and coil windings wound on it, which are surrounded by resin mass. It is provided that before the casting, the shape of the cooling channels adapted fabric parts are attached in the intended locations of the coil, the fabric parts are also cast and after the resin mass has dried out, the fabric parts are subjected to tensile stress in such a way that they separate from the resin mass solve and that thereafter the pieces of fabric are removed from their layers.
  • Absorption filter of the type mentioned above are offered by the applicant, for example, under the name “AF-DSR” and z. B. in the Leaflet "EPA absorption filter", www.epa .de, described.
  • the voltage gradients result in high-frequency voltages against the reference potential, which generates high-frequency differential currents (common mode current) in the kilohertz to megahertz range.
  • high-frequency differential currents common mode current
  • the effective values of these currents can be in the double-digit ampere range.
  • the residual currents do not flow between the live lines, but on all phase lines at the same time, galvanically on possibly shielded lines or via the bearings of motors.
  • the current then flows back to the source of the interference via the reference potential, such as the housing, earth, PE and PA (potential equalization) connections.
  • the reference potential such as the housing, earth, PE and PA (potential equalization) connections.
  • absorption filters are connected between the frequency converter and the motor.
  • Connection terminals are provided on an outer wall of the housing of the absorption filter, to which the lines of the electric motor on the one hand and the lines of the frequency converter on the other hand are connected.
  • At least one closed ring core is arranged with electrical conductors that are internally connected to the connection terminals.
  • the electrical conductors must be stripped, soldered or provided with a cable lug so that the necessary wiring and connection of the electrical conductors to the terminals can take place, which is associated with increased assembly and production costs.
  • the object of the present invention is to further develop an absorption filter and a method for producing an absorption filter of the type mentioned at the outset in such a way that on the one hand the production and on the other hand the assembly or installation of the absorption filter are simplified.
  • a simple retrofitting of the absorption filter z. B. can be made possible in a control cabinet without great expenditure of time and money.
  • the filter arrangement has at least one bushing in the form of a channel formed free of casting compound, the at least one bushing penetrating the at least one ring core and the housing in such a way that the at least one phase conductor can be fed through, in particular can be pushed through.
  • the at least one toroidal core is cast in the housing by means of a casting compound to form at least one passage, preferably in the form of a channel which is free of casting compound, the at least a bushing passes through the at least one ring core and the housing in such a way that the at least one phase conductor can be passed through, in particular can be pushed through.
  • the absorption filter no longer has any connection terminals.
  • the phase conductors of the motor can be routed or plugged through the bushings and connected directly to the frequency converter.
  • a simple retrofitting of the filter without great expenditure of time and money is thus made possible.
  • the absorption filter is maintenance-free because it has no connection terminals. Furthermore, the omission of the connection terminals leads to a reduction in the production costs of the absorption filter and also to a significant reduction in the housing dimensions.
  • the selection of the appropriate absorption filter is therefore not dependent on the size of the connection terminals and/or the level of the operating current of the motor, but on the size of the diameter of the bushings.
  • the bushings have a diameter that is larger than the diameter of the phase conductors so that they can be passed through or pushed through. The phase conductors can be pulled through the filter when it is installed.
  • the feedthrough is limited by the casting compound, so that no additional materials are required.
  • the phase conductors can also be passed through in a simple manner.
  • the second variant, in which the passage is formed by a pipe section, can preferably be used for large diameters.
  • the at least one bushing or the at least one piece of pipe preferably opens into opposite walls of the housing, so that the phase conductors can be inserted through the bushing in the longitudinal direction.
  • the at least one feedthrough can be designed as a single feedthrough or in the form of multiple feedthroughs.
  • Individual bushings have the advantage that the phase conductors are routed, inserted or pulled through the ring cores in a defined manner.
  • the at least one toroidal core can include a plurality of preferably closed toroidal cores made of nanocrystalline material, which are arranged along a longitudinal axis of the housing or also next to one another in the housing.
  • the phase conductor can pass through all toroidal cores in a row or just individual toroidal cores.
  • the individual ring cores are preferably fixed in the housing by means of a framework construction at a distance from one another and at a distance from the housing walls of the housing. This ensures that the toroidal cores can be cast in completely in order to achieve optimal heat transfer to the housing walls.
  • the full encapsulation also ensures that no dangerous contact voltages or leakage and fault currents occur on the housing, which is preferably made of plastic.
  • the casting compound is preferably selected from the group of polyurethanes and/or can preferably itself form the housing.
  • the invention also relates to a method for producing a filter arrangement, in particular an absorption filter for absorbing high-frequency differential currents in phase conductors of a supply line of an electric motor, with at least one toroidal core being arranged in a housing so that it is electrically connected to the at least one phase conductor of the supply line of the electric motor can be coupled, wherein the housing with the at least one toroidal core arranged therein is cast using a casting compound.
  • At least one feedthrough in the form of a channel, which is free of casting compound, is formed in the housing and the casting compound, the at least one feedthrough penetrating the at least one toroidal core and the housing in such a way that the at least one phase conductor practicable, as pushable, is.
  • the method according to the invention enables simple and cost-effective production.
  • the housings have a compact design and the connection of casting compound to the housing improves the heat dissipation of the heat loss of the toroidal cores to the environment.
  • the ring cores and the diameters of the at least one bushing are preferably configured in such a way that they are independent of the current through the individual phase conductors. As a result, only a limited number of variants needs to be kept available.
  • the absorption filters are designed for both small and large cross-section feed lines. Current and dielectric strength of connection terminals do not have to be taken into account.
  • the at least one passage can be formed by inserting at least one rod-shaped element into a channel spanned by the at least one ring core before pouring the casting compound into the housing, with the at least one rod-shaped element preferably penetrating opposite housing walls of the housing.
  • the housing can then be cast using the casting compound.
  • the rod-shaped element is preferably made of a material such as Teflon or silicone, which does not bond to the casting compound, so that the rod-shaped element can be pulled out of the casting compound after the casting and curing without damaging it.
  • the at least one passage can also be produced by drilling or milling.
  • the casting compound used is preferably one from the group of polyurethanes, which has good thermal conductivity.
  • the potting compound itself can also form the housing.
  • FIG. 1 shows a perspective representation of a filter arrangement 10, in particular an absorption filter for the absorption of high-frequency differential currents (common mode current) in phase lines of an electric motor.
  • the filter assembly 10 comprises a housing 12, preferably made of plastic, which in the exemplary embodiment shown is a standardized installation box with a substantially cuboid lower housing part 14 is trained.
  • the base housing 14 includes lateral mounting brackets 16, 18 with receptacles 20, 22 for fasteners, by means of which the housing 12 z. B. can be mounted in a control cabinet.
  • a cover 24 is provided, by means of which the lower housing part 14 can be closed.
  • a plurality of ring-shaped, closed, one-piece toroidal cores 26 - 34 are arranged in the housing 12 .
  • the ring cores 26-34 are arranged along a longitudinal axis 36 of the housing 12 and form a channel 38 with bushings 40, 42, 44 for receiving phase lines of a connecting cable of the electric motor.
  • a separate bushing 40, 42, 44 is provided for each phase line, each of which open into preferably opposite housing walls 46, 48.
  • the toroidal cores 26 - 34 in the housing 12, with the exception of the bushings 40, 42, 44 leading through the toroidal cores 26 - 34 are cast by means of a casting compound 50, with the casting compound 50 being between the toroidal cores 26 - 34 and the housing 12 essentially completely fills the cavity formed, so that the toroidal cores 26-34 are completely encapsulated with the exception of the bushings 40, 42, 44.
  • the casting compound 50 has good thermal conductivity, so that a particularly good heat dissipation of the heat loss of the toroidal cores 26 - 34 to the housing surface is achieved.
  • FIG. 2 shows a perspective side view of the filter assembly 10, partially in section.
  • a cavity 52 formed between the toroidal cores 26 - 34 and the housing wall is completely filled by the potting compound 50 , so that the toroidal cores are fully embedded in the potting compound 50 .
  • FIG 3 shows a perspective view of the toroidal cores 26-34 in the form of a toroidal core package 54.
  • the toroidal cores 26-34 are hereby arranged by means of a framework arrangement 56 at a distance from each other to ensure that the potting compound 50, the toroidal cores 26 - 34 completely encloses.
  • the framework arrangement 56 is shown in a perspective view in FIG 4 and comprises flat separating elements 58 - 68 running transversely to the longitudinal axis 36 and longitudinal struts 70, 72, 74 running in the longitudinal direction and fixing the separating elements 58 - 68 at equidistant intervals.
  • the individual separating elements 58 - 68 are arranged at a greater distance from one another as a width of an individual toroidal core 26-34.
  • openings 76, 78, 80 are provided, which are aligned with one another and define the position of the bushings 40, 42, 44.
  • the method according to the invention for producing the filter arrangement 10 is characterized in that the filter cores 26 - 34 are first fixed by means of the framework arrangement 56 and assembled to form the toroidal core assembly 54 .
  • the toroidal core assembly 54 is then inserted into the housing 12 so that the openings 76, 78, 80 in the separating elements 58-68 are aligned with the end openings in the housing walls 46, 48.
  • rod-shaped elements which do not form a connection with the casting compound, are passed through the openings 76, 78, 80, the rods completely penetrating the housing 12 and the toroidal cores 26-34.
  • the cover 24 is put on and the housing 12 is closed.
  • the casting compound 50 is then introduced into the interior of the housing via an opening in a housing wall until the ring cores 26 - 34 are completely surrounded or poured out by the casting compound 50 .
  • the rods that are not connected to the casting compound 50 can be pulled out of the casting compound 50 so that the bushings 40, 42, 44 are formed in the form of channels for the individual phase lines of the motor cable.
  • the bushings 40, 42, 44 in the form of channels, e.g. B. be produced by individual holes and / or milling.
  • a single channel can also be formed.
  • the toroidal cores can also be arranged side by side and/or in a longitudinal direction.
  • the filter arrangement 10 according to the invention has the advantage over the prior art that the individual phase lines of the motor can be routed loosely through the bushings 40, 42, 44, plugged or pulled and then connected directly to the frequency converter. Since the filter arrangement 10 according to the invention no longer has any connection terminals, very simple assembly, in particular also retrofitting of the filter, is possible without great expenditure of time and money.
  • the embedding in a casting compound 50 also has the advantage that heat generated in the toroidal cores 26 - 34 can be dissipated to the housing 12 and thus the efficiency of the toroidal cores 26 - 34 is improved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Frames (AREA)
  • Coils Or Transformers For Communication (AREA)
EP21200736.3A 2020-10-04 2021-10-04 Filtre d'absorption, ainsi que procédé de fabrication d'un tel filtre Pending EP3979272A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020125923.9A DE102020125923A1 (de) 2020-10-04 2020-10-04 Absorptionsfilter sowie Verfahren zur Herstellung eines solchen

Publications (1)

Publication Number Publication Date
EP3979272A1 true EP3979272A1 (fr) 2022-04-06

Family

ID=78332469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21200736.3A Pending EP3979272A1 (fr) 2020-10-04 2021-10-04 Filtre d'absorption, ainsi que procédé de fabrication d'un tel filtre

Country Status (2)

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EP (1) EP3979272A1 (fr)
DE (1) DE102020125923A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03102808A (ja) 1989-09-18 1991-04-30 Toshiba Corp ノイズフィルタ
US5200730A (en) * 1991-10-18 1993-04-06 Ferrishield, Inc. Premolded suppressor sleeve
US6218913B1 (en) 1998-02-18 2001-04-17 Curtis Industries, A Division Of Powers Holatings, Inc. Coaxial toroid EMI filter with discrete capacitors surrounding conductors
US20060283006A1 (en) * 2005-06-21 2006-12-21 Camarena Villasenor Jose D J Method of manufacture of magnetic induction devices
JP2014096538A (ja) * 2012-11-12 2014-05-22 Kitagawa Ind Co Ltd 複合フェライトコア及び雑音電流吸収具
US20150244339A1 (en) 2014-02-21 2015-08-27 Tyco Electronics Corporation Electromagnetic interference filter assembly
US20160065164A1 (en) * 2014-09-02 2016-03-03 Schaffner Emv Ag Filter component with windingless magnetic toroidal core
JP6643596B2 (ja) * 2015-12-18 2020-02-12 北川工業株式会社 ノイズ対策部品

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543977C2 (de) 1975-10-02 1983-12-15 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe Verfahren zur Herstellung von Vergüssen
DE2704337A1 (de) 1976-02-02 1977-08-04 Square D Co Ueberstromschutzgeraet fuer einen wechselstrommotor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03102808A (ja) 1989-09-18 1991-04-30 Toshiba Corp ノイズフィルタ
US5200730A (en) * 1991-10-18 1993-04-06 Ferrishield, Inc. Premolded suppressor sleeve
US6218913B1 (en) 1998-02-18 2001-04-17 Curtis Industries, A Division Of Powers Holatings, Inc. Coaxial toroid EMI filter with discrete capacitors surrounding conductors
US20060283006A1 (en) * 2005-06-21 2006-12-21 Camarena Villasenor Jose D J Method of manufacture of magnetic induction devices
JP2014096538A (ja) * 2012-11-12 2014-05-22 Kitagawa Ind Co Ltd 複合フェライトコア及び雑音電流吸収具
US20150244339A1 (en) 2014-02-21 2015-08-27 Tyco Electronics Corporation Electromagnetic interference filter assembly
US20160065164A1 (en) * 2014-09-02 2016-03-03 Schaffner Emv Ag Filter component with windingless magnetic toroidal core
JP6643596B2 (ja) * 2015-12-18 2020-02-12 北川工業株式会社 ノイズ対策部品

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EPA ABSORPTIONSFILTER, Retrieved from the Internet <URL:www.epa.de>

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Publication number Publication date
DE102020125923A1 (de) 2022-04-07

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