EP0258592B1 - Potential separation for a choke with an annular core - Google Patents
Potential separation for a choke with an annular core Download PDFInfo
- Publication number
- EP0258592B1 EP0258592B1 EP87110301A EP87110301A EP0258592B1 EP 0258592 B1 EP0258592 B1 EP 0258592B1 EP 87110301 A EP87110301 A EP 87110301A EP 87110301 A EP87110301 A EP 87110301A EP 0258592 B1 EP0258592 B1 EP 0258592B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- webs
- annular core
- ferrite
- potential
- potential isolation
- 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.)
- Expired - Lifetime
Links
- 238000000926 separation method Methods 0.000 title description 15
- 229910000859 α-Fe Inorganic materials 0.000 claims description 23
- 238000002955 isolation Methods 0.000 claims description 11
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 description 9
- 239000011810 insulating material Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
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
- H01F17/062—Toroidal core with turns of coil around it
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
Definitions
- the invention relates to a ferrite ring core with a potential separation for the windings of a ring core choke which are applied to different ring core sections of the ferrite ring core.
- DE-OS 30 47 603 describes an insertable insulating material plate which can be inserted into the opening of a ferrite ring core and which is designed to be resilient by means of slot-like openings which run transversely to the insertion opening of the ferrite ring core, in such a way that the inserted insulating material plates with their corresponding end edges bear resiliently against the ferrite ring core.
- DE-OS 33 30 881 finally describes a potential separation for toroidal chokes with upright webs aligned to an insulating plate, which with their mutually facing inner end edges via a resilient Ring are interconnected and resiliently rest with their outer end edges against the attached ferrite core ring.
- the present invention has for its object to provide a potential separation of the type mentioned, which avoids the disadvantages shown above; d. H. in particular also compensates for large tolerances in the inner hole diameters of the ferrite ring cores, without exposing the ferrite ring cores to high mechanical stresses. Nonetheless, this potential separation should be applied to the hole wall of the ferrite cores with firm pressure and ensure reliable compliance with the distances between the windings required by the test centers.
- the electrical isolation according to the invention has a hollow cylindrical one made from an elastic plastic, in particular an elastomer Element, the opening of which is arranged in the direction of the insertion opening of the ferrite core and which has at least two webs integrally formed on the outer circumferential surface of the element, which, when the element is pushed into the ring core opening, bear with their free web ends against the ferrite ring core.
- the thickness of the webs is of secondary importance for tolerance compensation, so that the thickness of the webs can be adapted to the required spacing between the windings.
- the tolerance compensation takes place essentially through the possibility of deformation of the hollow cylindrical element or part of the potential separation, which is secured against destruction due to its elastic properties. In any case, studies have shown that when the hollow cylindrical element is deformed into an element with an oval cross section, the forces generated do not increase excessively. By varying the inside and / or outside diameter of the hollow cylindrical element, any desired pressure characteristic can also be set.
- Two webs which are diametrically aligned with one another are preferably formed on the lateral surface of the hollow cylindrical element.
- webs are molded onto the outer surface of the element in accordance with the number of windings and the distribution of the windings.
- the height of the hollow cylindrical element and its webs corresponds approximately to the height of the ferrite ring core.
- 1, 2 has a hollow cylindrical or tubular element 1 made of elastic plastic, in particular elastomer, on the outer lateral surface of which two webs 2, 2 are integrally formed.
- the webs 2, 2 lie with their free web ends 4, 4 elastically against the ferrite ring core 5.
- the webs 2.2 ensure the necessary insulation distance between the windings 6, 7 of the ferrite ring core choke (see FIG. 3).
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
- Springs (AREA)
Description
Die Erfindung betrifft einen Ferritringkern mit einer Potentialtrennung für die auf unterschiedliche Ringkernabschnitte des Ferritringkerns aufgebrachten Wicklungen einer Ringkerndrossel.The invention relates to a ferrite ring core with a potential separation for the windings of a ring core choke which are applied to different ring core sections of the ferrite ring core.
Es ist bereits eine Vielzahl von Potentialtrennungen für Drosseln bekannt. So beschreibt beispielsweise die DE-OS 30 47 603 ein in die Öffnung eines Ferritringkerns einschiebbares Isolierstoff-Plättchen, das mittels schlitzartiger Durchbrechungen, die quer zur Einschuböffnung des Ferritringkerns verlaufen, federnd gestaltet ist, derart, daß die eingeschobenen Isolierstoff-Plättchen mit ihren entsprechenden Stirnkanten federnd gegen den Ferritringkern anliegen.A large number of potential separations for chokes are already known. For example, DE-OS 30 47 603 describes an insertable insulating material plate which can be inserted into the opening of a ferrite ring core and which is designed to be resilient by means of slot-like openings which run transversely to the insertion opening of the ferrite ring core, in such a way that the inserted insulating material plates with their corresponding end edges bear resiliently against the ferrite ring core.
Dieser bekannten Potentialtrennung haften jedoch erhebliche Nachteile an. Bei kleinen Durchmessern der Ferritringkernöffnungen sind diese Plättchen nur schwer montierbar und bewirken so auf Grund ihrer hohen Anpreßdrucke unerwünschte Änderungen der magnetischen Werte der Drosseln. Die Herabsetzung der Anpreßdrucke ist wiederum nur durch ausreichend elastische und damit verhältnismäßig dünne Isolierstoff-Plättchen erzielbar, was dazu führt, daß die geforderten Abstände zwischen den Wicklungen, die z. B. bei CSA = 2,4mm liegen, nicht eingehalten werden können.However, this known potential separation has considerable disadvantages. With small diameters of the ferrite ring core openings, these plates are difficult to assemble and, due to their high contact pressures, cause undesirable changes in the magnetic values of the chokes. The reduction of the contact pressures can in turn only be achieved by sufficiently elastic and therefore relatively thin insulating material plates, which leads to the fact that the required distances between the windings, the z. B. CSA = 2.4mm, can not be met.
Die DE-OS 33 30 881 beschreibt schließlich eine Potentialtrennung für Ringkerndrosseln mit zu einer Isolierstoffplatte aufrecht ausgerichteten Stegen, die mit ihren einander zugekehrten inneren Stirnkanten über einen federnden Ring miteinander verbunden sind und mit ihren äußeren Stirnkanten federnd gegen den aufgesteckten Ferritkernring anliegen.DE-OS 33 30 881 finally describes a potential separation for toroidal chokes with upright webs aligned to an insulating plate, which with their mutually facing inner end edges via a resilient Ring are interconnected and resiliently rest with their outer end edges against the attached ferrite core ring.
Diese Potentialtrennung ist nur mit verhältnismäßig großem Aufwand herstellbar, so daß gerade bei diesem Typ die durch unterschiedliche Höhen der Drosseln bedingte Forderung nach unterschiedlich hohen Potentialtrennungen und damit die Notwendigkeit unterschiedlicher Werkzeuge zu hohen Kosten führt. Wird die Ringkerndrossel in Becher eingegossen, so erweist sich diese Gestaltung gleichfalls als zu aufwendig.This electrical isolation can only be produced with a relatively large amount of effort, so that, in this type in particular, the requirement for different levels of electrical isolation caused by different heights of the chokes and thus the need for different tools leads to high costs. If the toroidal choke is poured into a cup, this design also proves to be too complex.
Beiden bekannten Potentialtrennungen ist zudem gemeinsam, daß sie jeweils nur mit vier Kanten, also nicht flächig am Ringkern anliegen und damit in den Anlagebereichen hohe Druckkfräfte verursachen, welche die magnetischen Eigenschaften der Ringkerndrosseln beeinträchtigen.Both known potential separations also have in common that they each have only four edges, that is to say they do not lie flat against the toroidal core, and thus cause high compressive forces in the contact areas, which impair the magnetic properties of the toroidal core chokes.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Potentialtrennung der eingangs genannten Art zu schaffen, die vorstehend aufgezeigte Nachteile vermeidet; d. h. insbesondere auch große Toleranzen der Innenlochdurchmesser der Ferritringkerne ausgleicht und zwar ohne die Ferritringkerne hohen mechanischen Beanspruchungen auszusetzen. Gleichwohl soll diese Potentialtrennung mit festem Andruck an der Lochwandung der Ferritringkerne anliegen und eine sichere Einhaltung der von den Prüfstellen geforderten Abstände zwischen den Wicklungen gewährleisten.The present invention has for its object to provide a potential separation of the type mentioned, which avoids the disadvantages shown above; d. H. in particular also compensates for large tolerances in the inner hole diameters of the ferrite ring cores, without exposing the ferrite ring cores to high mechanical stresses. Nonetheless, this potential separation should be applied to the hole wall of the ferrite cores with firm pressure and ensure reliable compliance with the distances between the windings required by the test centers.
Zur Lösung dieser Aufgabe weist die Potentialtrennung gemäß der Erfindung ein aus einem elastischen Kunststoff, insbesondere Elastomer, gefertigtes, hohlzylindrisches Element auf, dessen Öffnung in Richtung der Einschuböffnung des Ferritkerns angeordnet ist und das mindestens zwei an die äußere Mantelfläche des Elements angeformte Stege besitzt, die im in die Ringkernöffnung eingeschobenen Zustand des Elements mit ihren freien Stegenden gegen den Ferritringkern anliegen.To achieve this object, the electrical isolation according to the invention has a hollow cylindrical one made from an elastic plastic, in particular an elastomer Element, the opening of which is arranged in the direction of the insertion opening of the ferrite core and which has at least two webs integrally formed on the outer circumferential surface of the element, which, when the element is pushed into the ring core opening, bear with their free web ends against the ferrite ring core.
Bedingt durch die Elastizität des verwendeten Kunststoffes herrscht in den Anlagebereichen der Potentialtrennung eine gleichmäßige Druckverteilung. Zudem ist, gleichfalls auf Grund der Elastizität, die Dicke der Stege für den Toleranzausgleich von untergeordneter Bedeutung, so daß die Dicke der Stege jeweils an die geforderten Abstände zwischen den Wicklungen angepaßt werden kann. Der Toleranzausgleich erfolgt nämlich im wesentlichen durch die Deformationsmöglichkeit des hohlzylindrischen Elements bzw. Teils der Potentialtrennung, das auf Grund seiner elastischen Eigenschaften gegen Zerstörung gesichert ist. Untersuchungen haben jedenfalls gezeigt, daß bei einer Deformation des hohlzylindrischen Elements zu einem Element mit ovalem Querschnitt die dabei erzeugten Kräfte nicht übermäßig ansteigen. Durch Variation der Innen- und/oder Außendurchmesser des hohlzylindrischen Elements kann im übrigen jede gewünschte Druckcharakteristik eingestellt werden.Due to the elasticity of the plastic used, there is an even pressure distribution in the potential isolation areas. In addition, also due to the elasticity, the thickness of the webs is of secondary importance for tolerance compensation, so that the thickness of the webs can be adapted to the required spacing between the windings. The tolerance compensation takes place essentially through the possibility of deformation of the hollow cylindrical element or part of the potential separation, which is secured against destruction due to its elastic properties. In any case, studies have shown that when the hollow cylindrical element is deformed into an element with an oval cross section, the forces generated do not increase excessively. By varying the inside and / or outside diameter of the hollow cylindrical element, any desired pressure characteristic can also be set.
Bevorzugt sind an die Mantelfläche des hohlzylindrischen Elements zwei zueinander diametral ausgerichtete Stege angeformt. Bei drei und mehr Wicklungen sind entsprechend der Wicklungsanzahl und Verteilung der Wicklungen Stege an die Mantelfläche des Elements angeformt.Two webs which are diametrically aligned with one another are preferably formed on the lateral surface of the hollow cylindrical element. In the case of three or more windings, webs are molded onto the outer surface of the element in accordance with the number of windings and the distribution of the windings.
Zur Schaffung einer weitgehend gleichmäßigen Druckbelastung entspricht die Höhe des hohlzylindrischen Elements und seiner Stege etwa der Ferritringkernhöhe.To create a largely uniform pressure load, the height of the hollow cylindrical element and its webs corresponds approximately to the height of the ferrite ring core.
Diese Potentialtrennungen lassen sich im Strangpreßverfahren und folglich mit nur geringem Aufwand herstellen, wobei der Preßstrang entsprechend der gewünschten Höhe der Potentialtrennungen in einzelne Potentialtrennungen aufgeteilt wird.
Bei unterschiedlich hohen Ferritringkernen mit etwa gleichem Durchmesser der Ringkernöffnung müssen folglich keine neuen Werkzeuge beschafft werden; es genügt vielmehr, wenn nur die Einstellung der Ablängvorrichtung der Werkzeuge entsprechend geändert wird.These potential separations can be produced in the extrusion process and consequently with little effort, the press strand being divided into individual potential separations in accordance with the desired level of potential separations.
In the case of ferrite ring cores of different heights with approximately the same diameter of the ring core opening, no new tools therefore have to be procured; it is rather sufficient if only the setting of the cutting device of the tools is changed accordingly.
Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles erläutert. Es zeigt:
- Fig. 1
- Eine Potentialtrennung nach der Erfundung in perspektivischer Darstellung
- Fig. 2
- Eine Draufsicht auf eine Potentialtrennung nach Fig. 1
- Fig. 3
- Eine Ferritringkerndrossel mit einer Potentialtrennung nach Fig. 1, 2 in Draufsicht, wobei die Wicklungen teils nur angedeutet sind.
- Fig. 1
- A potential separation after the invention in perspective
- Fig. 2
- A top view of a potential separation according to FIG. 1
- Fig. 3
- A ferrite toroidal choke with a potential separation according to Fig. 1, 2 in plan view, the windings are only partially indicated.
Die Potentialtrennung nach Fig. 1, 2 besitzt ein aus elastischem Kunststoff, insbesondere Elastomer gefertigtes hohlzylindrisches bzw. röhrchenförmiges Element 1, an dessen äußere Mantelfläche zwei Stege 2,2 einstückig angeformt sind.1, 2 has a hollow cylindrical or tubular element 1 made of elastic plastic, in particular elastomer, on the outer lateral surface of which two
In ihrem in die Ringkernöffnung 3 eines Ferritringkerns 5 eingeschobenen Zustand liegen die Stege 2,2 mit ihren freien Stegenden 4,4 elastisch gegen den Ferritringkern 5 an. Die Stege 2,2 gewährleisten dabei den notwendigen Isolationsabstand zwischen den Wicklungen 6, 7 der Ferritringkerndrossel (siehe Fig. 3).In their state inserted into the ring core opening 3 of a ferrite ring core 5, the
Claims (6)
- Ferrite annular core (5) having potential isolation for the turns of an annular core inductor, fitted on various annular core sections of the ferrite annular core, characterised by a hollow-cylindrical element (1), produced from an elastic plastic, whose opening is arranged in the direction of the insertion opening of the ferrite core (5) and which has at least two webs (2,2) which are integrally formed on the outer surface of the element and rest with their free web ends (4,4) against the ferrite annular core (5) when the element is pushed into the annular core opening (3).
- Potential isolation according to Claim 1, characterised in that two webs (2,2), which are directed diametrically with respect to one another, are integrally formed on the outer surface of the element (1).
- Potential isolation according to Claim 1, characterised in that webs are integrally formed on the outer surface of the element (1) corresponding to the number of turns and the distribution of the turns.
- Potential isolation according to Claim 1, 2 or 3, characterised in that the hollow-cylindrical element (1) and the webs (2,2) are produced integrally from an elastomer.
- Potential isolation according to Claim 1, 2, 3 or 4, characterised in that the height of the hollow-cylindrical element (1) and of the webs (2,2) corresponds approximately to the height of the ferrite annular core.
- Method for producing potential isolation according to Claim 1 and Claim 2, 3, 4 or 5, characterised in that the hollow-cylindrical elements (1) and their webs (2,2), which are preferably formed integrally, are produced using the extrusion method, and the extrusion length is cut off corresponding to the desired height of the potential isolations.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3626152 | 1986-08-01 | ||
| DE3626152 | 1986-08-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0258592A1 EP0258592A1 (en) | 1988-03-09 |
| EP0258592B1 true EP0258592B1 (en) | 1992-12-09 |
Family
ID=6306528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87110301A Expired - Lifetime EP0258592B1 (en) | 1986-08-01 | 1987-07-16 | Potential separation for a choke with an annular core |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0258592B1 (en) |
| DE (1) | DE3782987D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202013000695U1 (en) | 2013-01-24 | 2013-01-31 | Würth Elektronik eiSos Gmbh & Co. KG | Separating element for a toroidal core choke and toroidal core |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10308010A1 (en) * | 2003-02-25 | 2004-09-09 | Epcos Ag | Insulating part, toroidal core, toroidal core choke and method for producing the toroidal core choke |
| DE102004037853A1 (en) | 2004-08-04 | 2006-03-16 | Epcos Ag | Holder for a choke coil and an inductive component with the holder |
| DE102004039230A1 (en) | 2004-08-12 | 2006-02-23 | Epcos Ag | Inductive component for high currents and method for its production |
| DE202004014066U1 (en) * | 2004-09-09 | 2004-12-16 | Vogt Electronic Aktiengesellschaft | Carrier component and suppression choke device |
| DE102004048966A1 (en) | 2004-10-07 | 2006-04-13 | Epcos Ag | Device for electrical isolation, toroidal core choke and method for producing the toroidal core choke |
| DE102005006344A1 (en) | 2005-02-11 | 2006-08-17 | Epcos Ag | Insulating part and toroidal core choke |
| DE102009054001A1 (en) * | 2009-11-19 | 2011-08-04 | Epcos Ag, 81669 | Device for potential separation and toroidal core choke |
| DE102016206171A1 (en) | 2016-04-13 | 2017-10-19 | Würth Elektronik eiSos Gmbh & Co. KG | Separating element for a toroidal core choke and toroidal core choke |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2147816B1 (en) * | 1971-07-30 | 1975-02-07 | Landis & Gyr Ag | |
| DE3047603A1 (en) * | 1980-12-17 | 1982-07-22 | Siemens AG, 1000 Berlin und 8000 München | Winding separator for two coils on ring core - with axial slits to give spring effect to assist fitting into ring |
| DE3318557A1 (en) * | 1983-05-20 | 1984-11-22 | Siemens AG, 1000 Berlin und 8000 München | Holder for an electrical component, especially an annular-cored inductor |
| DE3318527A1 (en) * | 1983-05-20 | 1984-11-22 | Siemens AG, 1000 Berlin und 8000 München | Holder for an electrical component, especially an annular-cored inductor |
| DE3330881A1 (en) * | 1983-08-26 | 1985-03-14 | Siemens AG, 1000 Berlin und 8000 München | BRACKET FOR A PARTICULAR CURRENT COMPENSATED FERRITE RING CORE CHOKE |
-
1987
- 1987-07-16 EP EP87110301A patent/EP0258592B1/en not_active Expired - Lifetime
- 1987-07-16 DE DE8787110301T patent/DE3782987D1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202013000695U1 (en) | 2013-01-24 | 2013-01-31 | Würth Elektronik eiSos Gmbh & Co. KG | Separating element for a toroidal core choke and toroidal core |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3782987D1 (en) | 1993-01-21 |
| EP0258592A1 (en) | 1988-03-09 |
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