EP0092204B1 - Drosselspule - Google Patents

Drosselspule Download PDF

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Publication number
EP0092204B1
EP0092204B1 EP83103679A EP83103679A EP0092204B1 EP 0092204 B1 EP0092204 B1 EP 0092204B1 EP 83103679 A EP83103679 A EP 83103679A EP 83103679 A EP83103679 A EP 83103679A EP 0092204 B1 EP0092204 B1 EP 0092204B1
Authority
EP
European Patent Office
Prior art keywords
winding
inductance coil
core
insulating cylinder
ferromagnetic
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
Application number
EP83103679A
Other languages
English (en)
French (fr)
Other versions
EP0092204A3 (en
EP0092204A2 (de
Inventor
Giuseppe Marchegiani
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.)
Sirten Srl Italiana Reattanze Trasformatori Elettronica Nuclei Soc
Original Assignee
Sirten Srl Italiana Reattanze Trasformatori Elettronica Nuclei Soc
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 Sirten Srl Italiana Reattanze Trasformatori Elettronica Nuclei Soc filed Critical Sirten Srl Italiana Reattanze Trasformatori Elettronica Nuclei Soc
Priority to AT83103679T priority Critical patent/ATE24627T1/de
Publication of EP0092204A2 publication Critical patent/EP0092204A2/de
Publication of EP0092204A3 publication Critical patent/EP0092204A3/en
Application granted granted Critical
Publication of EP0092204B1 publication Critical patent/EP0092204B1/de
Expired 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/361—Electric or magnetic shields or screens made of combinations of electrically conductive material and ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/08—Fixed transformers not covered by group H01F19/00 characterised by the structure without magnetic core
    • 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
    • H01F27/085—Cooling by ambient air
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • the present invention relates to an inductance coil particularly suitable in the cases in which very small room is available and encumbering problems exist, for example in railway field, and in which at the same time it is necessary to eliminate or at least essentially limit the outwardly directed noises.
  • FR-A-1 398 036 discloses an inductance coil comprising a conducting coil winding being encompassed by an electrically insulating cylinder and by a housing concentrically mounted outwardly with respect to the coil winding and to the insulating cylinder.
  • the housing is embracing the whole side surface of the winding.
  • inductances As it is known, one of the main problems about inductances is that of heating, sometimes intolerable, which the turns of coil windings undergo; it is further known that the operating temperature is a limiting factor as regards the operating conditions of the inductance, and the number of turns and the wire cross section size being the same, the current density which may pass within the winding will be as more high as better is the cooling effectiveness.
  • the solution of the problem consists in providing windings, the conducting turns of which are alternately arranged with respect to channels for the cooling air parallely circulating with respect to the coil axis.
  • the inductance magnetic circuit is formed partly by a lamellarferromagnetic body, and partly by air (air gap).
  • the air part is as much more developed, the ferromagnetic part being proportionally reduced, as higher is the product of the number of turns by the current passing therethrough.
  • a ferromagnetic part is present within the coil, whereby a too high number of turns is not required, such as it would be necessary in the case of a magnetic circuit in air only.
  • a transformer which comprises a shield for reducing the outwardly dispersed magnetic flow.
  • This shield consists of a ferromagnetic material and it is disposed at the inner side of a housing.
  • This transformer is cooled by a liquid, not by means of an air forced circulation.
  • EP-A 1-0081 111 also falling within the terms of Article 54(3), describes a transformer comprising a housing of electrically insulating material embraced by a short circuited winding of electrically conducting material in order to reduce the outwardly dispersed magnetic flow.
  • This transformer does not comprise channels for the passage of cooling air, either.
  • DE-C-1 212 626 discloses a transformer provided with shields of metallic material disposed inwardly and outwardly of the coil windings.
  • This known transformer comprises neither channels for the passage of cooling air nor a cylinder of an insulating material which encompasses the coil windings.
  • the main object of the present invention is that of providing an inductance coil of extremely reduced size, maintaining an unchanged cooling effectiveness as that of the known coils, and permitting to eliminate or essentially reduce the outwardly dispersed magnetic flow.
  • an inductance coil of the type comprising at least one coil winding of wire alternately disposed with respect to channels for the cooling air flow, said winding being at least externally encompassed by an insulating cylinder, characterized in that at least externally and in position adjacent to said at least one winding a ferro-magnetic core is provided, said core being concentrically positioned with respect to said at least one winding, said core extending for about the height of said at least one winding.
  • inductance coil of the invention further windings are provided externally positioned with respect to the said outer insulating cylinder, said windings being short-circuited and having the purpose of reducing alternated current components by opposing the same thanks to the induced currents generated in the same further windings.
  • coil windings are provided positioned at the ends of and within the insulating cylinder, said windings carrying the same current of the primary winding passing through said windings, but in the opposite direction so as to reduce both the a.c. components and the d.c. ones of the outwardly directed flow.
  • an additional cylinder of conducting metal fulfilling the same function of said short-circuited outer windings, and forming moreover a metallic structure for supporting and assembling the inductance coil.
  • a second ferromagnetic core is provided, mounted internally of the insulating cylinder which internally delimits said coil winding, said second core being adjacent and preferably in contact with said insulating cylinder, and leaving a hollow passage coaxial with the axis of said insulating cylinder.
  • the inductance coil of the invention comprises a coil winding 10, of usual structure, the wire turns of which are alternately disposed with respect to channels 11 through which the cooling air is guided and forced in the direction shown by arrows 12.
  • the coil winding 10 is encompassed by two concentric insulating cylinders 13 and 14. It should be intended that the above described elements are of strictly conventional type, so that they are not shown in greater detail.
  • a cylindrical ferromagnetic core 15 is coaxially mounted with respect to the winding 10 and externally of, but in a position adjacent to, the cylinder 13, said core substantially embracing the whole side surface of the winding 10. In this way any interference and disturbance of adjacent apparatus, in particular adjacent inductance coils, are eliminated without substantially changing the size of the inductance coil; as a matter of fact the core 15 forms a closing element for the magnetic flow linked to the winding 10, which otherwise would be outwardly dispersed.
  • the ferromagnetic core 15 may be, in a manner per se known, either in form of a cylinder of a wound band or in form of adjacent packs of lamellaplates, parallely positioned with respect to the coil axis.
  • FIG. 2 it is clearly shown that besides the structure already illustrated in Fig. 1 two end windings 16 and 17 are added, which are short-circuited, which in the shown position (i.e. outside of the insulating cylinder 13) oppose themselves to the magnetic flow dispersion and more particularly to the a.c. component thereof. If in the windings 16 and 17, on the contrary the same current of the winding 10 flows, but in the opposed direction, they oppose both to the a.c. and to the d.c. components of the externally dispersed flow, thus improving the elimination of the flow dispersed outside of the coil.
  • a cylinder 18 is provided concentrically and externally of the core 15.
  • This cylinder 18 when made of ferromagnetic material, serves to collect the possible remaining flow which is dispersed outwardly notwithstanding the presence of the magnetic core 15 and, when made of a different conductor metal, it acts likewise a short-circuited closed turn and opposes to the a.c. components of the magnetic flow which might eventually escape from the magnetic core 15.
  • the cylinder 18 serves also as a supporting frame of the coil and for the assembling of the same at the desired position.
  • Fig. 3 shows an embodiment similar to that of Fig. 2, from which it differs only because two coil windings 10 are provided, instead of one, thus giving place to two superimposed inductances.
  • ferromagnetic cores 19 are provided sized so that the air circulation is not hindered, said cores obviously acting to prevent the dispersed flow through the coil ends from passing.
  • FIG. 4 an embodiment substantially similar to that of Fig. 2 is shown, with the exception that in addition to the ferromagnetic core 15 (not shown in the figures and similar to that of Fig. 1) which encircles the outer insulating cylinder 13, a further ferro- magnetic core 115 is provided in form of lamellar packs fastened at the adjacent surface of the inner insulating cylinder 14.
  • the ferromagnetic core 115 obviously can also be in form of a continuous wound element, having the function of collecting and guiding the lines of force of the magnetic field due to the reasons well known in the art.
  • coil windings 16 and 17 of Fig. 2 may also be provided.
  • the core 115 extends from the insulating cylinder 14 towards the center, but leaving free passage along the axis of the coil either because the latter becomes lighter and because the costs are reduced, and finally because the efficiency of the coil itself is improved lower is the distance between core and winding the more effective is action of the ferromagnetic component. It is finally meant that some of the above described components can be substituted for by other components having an identical function and which accordingly are intended to be included in the scope of present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Burglar Alarm Systems (AREA)
  • Filters And Equalizers (AREA)

Claims (8)

1. Induktionsspule, die wenigstens eine leitende Spulenwindung (10) aufweist, welche in Bezug auf Kanäle (11) für den Durchlaß von Kühlungsluft abwechselnd angeordnet ist, wobei die wenigstens eine Windung (10) wenigstens außen von einem isolierenden Zylinder (13) umgeben ist, dadurch gekennzeichnet, daß wenigstens außerhalb der wenigstens einen Spulenwindung (10) und des isolierenden Zylinders (13) konzentrisch zu der wenigstens einen Windung (10) ein ferromagnetischer Kern (15) angebracht ist, wobei der Kern (15) sich ungefähr bis zur Höhe der wenigstens einen Windung (10) erstreckt.
2. Induktionsspule nach Anspruch 1, dadurch gekennzeichnet, daß an den Enden der wenigstens einen Windung (10) Drahtwicklungen (16, 17) vorgesehen sind, die außerhalb des äußeren isolierenden Zylinders (13) befestigt sind, wobei die Wicklungen (16, 17) den gleichen Strom führen, der durch die wenigstens eine Windung (10) fließt, aber in entgegengesetzter Richtung.
3. Induktionsspule nach Anspruch 1, dadurch gekennzeichnet, daß an den Enden der wenigstens einen Windung (10) Leiterwicklungen (16, 17) vorgesehen sind, wobei die Wicklungen (16, 17) außerhalb des isolierenden Zylinders (13) befestigt und kurzgeschlossen sind.
4. Induktionsspule nach Anspruch 1, dadurch gekennzeichnet, daß außerhalb des ferromagnetischen Kernes (15) ein aus einem leitenden Metall hergestellter Zylinder (18) vorgesehen ist.
5. Induktionsspule nach Anspruch 4, dadurch gekennzeichnet, daß der äußere Zylinder (18) auch aus einem ferromagnetischen Material hergestellt ist.
6. Induktionsspule nach Anspruch 1, bei der die wenigstens eine Windung (10) durch einen inneren isolierenden Zylinder begrenzt ist, dadurch gekennzeichnet, daß an einer zu dem inneren isolierenden Zylinder (14) benachbarten Position ein ferromagnetischer Kern (115) vorgesehen ist, wobei der Kern (15) einen feien Durchgang entlang der Achse der Spule (10) läßt.
7. Induktionsspule nach den Ansprüchen 1 und 6, dadurch gekennzeichnet, daß die ferromagnetischen Kerne (15, 115) durch Aufwinden eines ferromagnetischen Streifens die Form eines Hohlzylinders hat.
8. Induktionsspule nach den Ansprüchen 1 und 6, dadurch gekennzeichnet, daß die ferromagnetischen Kerne (15, 115) die Form von in Bezug auf die Spulenachse parallel ausgerichteten Packungen von Blechplatten haben.
EP83103679A 1982-04-16 1983-04-15 Drosselspule Expired EP0092204B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83103679T ATE24627T1 (de) 1982-04-16 1983-04-15 Drosselspule.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8221582U IT8221582V0 (it) 1982-04-16 1982-04-16 Bobina d'induttanza.
IT2158282U 1982-04-16

Publications (3)

Publication Number Publication Date
EP0092204A2 EP0092204A2 (de) 1983-10-26
EP0092204A3 EP0092204A3 (en) 1984-02-15
EP0092204B1 true EP0092204B1 (de) 1986-12-30

Family

ID=11183916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83103679A Expired EP0092204B1 (de) 1982-04-16 1983-04-15 Drosselspule

Country Status (4)

Country Link
EP (1) EP0092204B1 (de)
AT (1) ATE24627T1 (de)
DE (1) DE3368807D1 (de)
IT (1) IT8221582V0 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3344047A1 (de) * 1983-12-06 1985-06-13 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Magnetsystem fuer einen kernspintomograph
DE102011011302A1 (de) * 2011-02-15 2012-08-16 Sew-Eurodrive Gmbh & Co. Kg Anordnung zum Kühlen einer Spule und Umrichter
CN102290217B (zh) * 2011-05-04 2012-08-22 广东海鸿变压器有限公司 悬挂式安装的c级立体卷铁心干式变压器线圈
US9175694B2 (en) * 2012-03-20 2015-11-03 Hamilton Sundstrand Corporation Air cooled motor controllers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142029A (en) * 1960-08-22 1964-07-21 Gen Electric Shielding of foil wound electrical apparatus
GB1007569A (en) * 1962-05-29 1965-10-13 Anthony Barclay Trench Current limiting reactor
FR1398036A (fr) * 1964-03-24 1965-05-07 Electricite De France Inductance résistant aux efforts électrodynamiques élevés
FR1519919A (fr) * 1967-03-13 1968-04-05 Siemens Ag Bobine d'électroaimant refroidie par un liquide et procédé de fabrication d'une telle bobine
DE2108344A1 (de) * 1971-02-22 1972-09-07 Transformatoren Union Ag Anordnung zur Abschirmung der Kesselwand von Transformatoren und Drosselspulen
US4233583A (en) * 1978-09-22 1980-11-11 Bicron Electronics Company Flux shielded solenoid

Also Published As

Publication number Publication date
EP0092204A3 (en) 1984-02-15
EP0092204A2 (de) 1983-10-26
IT8221582V0 (it) 1982-04-16
ATE24627T1 (de) 1987-01-15
DE3368807D1 (en) 1987-02-05

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