EP0997916B1 - Electromagnet with heat transfer body - Google Patents

Electromagnet with heat transfer body Download PDF

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Publication number
EP0997916B1
EP0997916B1 EP99119999A EP99119999A EP0997916B1 EP 0997916 B1 EP0997916 B1 EP 0997916B1 EP 99119999 A EP99119999 A EP 99119999A EP 99119999 A EP99119999 A EP 99119999A EP 0997916 B1 EP0997916 B1 EP 0997916B1
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EP
European Patent Office
Prior art keywords
electromagnet
heat
dissipating device
legs
electromagnet according
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
Application number
EP99119999A
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German (de)
French (fr)
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EP0997916A1 (en
Inventor
Manfred Breitkopf
Hartmut Dipl. Ing Schumacher
Bernhard Hiltl
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
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Publication of EP0997916A1 publication Critical patent/EP0997916A1/en
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Publication of EP0997916B1 publication Critical patent/EP0997916B1/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets

Definitions

  • the invention relates to an electromagnet with a Coil with at least two metal outer surfaces surrounding this coil and with a heat sink with at least an outer surface for heat transport.
  • DE-H 97 10 VII c / 21g - 25.9.52 discloses an electromagnet a coil with at least two surrounding this coil Metal outer surfaces and with a heat sink at least one outer surface for heat transport.
  • the electromagnet is cooled via the Flange to which a good heat-conducting metal plate with a Rib arrangement is attached.
  • Electromagnets are found in switching devices, in particular Safety position switches, diverse application. at Permanent activation of the electromagnet heats it up and can lead to an inadmissible warming up of the device. Around To prevent this, different solutions have so far been found applied.
  • One way is to have relatively large metal housings to use with which the electromagnet directly is screwed. The heat is well here in the housing walls derived. However, the screw connection must be sealed here against water intrusion.
  • alternative large-volume electromagnets are used, which are relatively expensive and, above all, enlarge the device and make it harder. These magnets also have an anchor large mass, problems with bumps, shocks or Vibrations.
  • the invention has for its object an electromagnet of the type mentioned above with a heat dissipation system provided that allows a good dissipation of the thermal energy and thus prevents excessive heating.
  • the formed as a separate component not belonging to the electromagnet encompasses the electromagnet at least partially, and that the heat sink two legs, each with an inner surface has a large area on one of the metal outer surfaces is applied, so that the heat dissipation body a thermal bridge from the Metal outer surfaces over the inner surfaces of the legs to his Forms outside surfaces.
  • the heat sink is U-shaped, there are additional ones Heat dissipation surfaces are available and it can be inside the heat dissipation body a correspondingly good heat balance occur.
  • the electromagnet is advantageously in a housing an electrical switching device, in particular a position switch, with housing walls installed, and the heat sink forms at least one of the housing walls Thermal bridge.
  • Another advantageous embodiment is when the Legs each have a thermal bridge to one of the housing walls form. This is achieved particularly advantageously if the Leg with its outer surface on one of the housing walls large-scale.
  • the web connecting the legs is a thermal bridge to one of the housing walls, which is advantageous is achieved that the web connecting the legs on one of the housing walls lies over a large area. This can e.g. be the bottom of the case, that when screwed onto a metal plate ensures particularly good heat transfer.
  • the holding plate advantageously has two projections Inclusion of terminals on, which makes it easy the connection of the coil is made possible.
  • FIG 1 is an electromagnet 1 with an associated heat sink 2 shown.
  • the electromagnet 1 has one Coil 3 and a yoke 4 surrounding it with metal outer surfaces 5 on.
  • the heat sink 2 is U-shaped here two legs 6 and a web 7 connecting them.
  • the outer surface of the web 7 bears the reference number 8, the outer surfaces of the legs 6 have the reference number 9.
  • the inner surfaces 10 of the legs 6 are in the assembled state Condition over a large area on the metal outer surfaces 5, so that a good heat transfer between the yoke 4 and the heat sink 2 is possible.
  • FIGS. 2 and 3 show the use of the electromagnet 1 with the heat sink 2 in an electrical switching device shown with a housing 11. This can e.g. the encapsulated Housing of a position switch.
  • Figure 2 shows the installation position of the electromagnet 1 with the U-shaped Heat dissipation body 2, the legs with the outer surfaces 9 rest on the housing walls 12 over a large area.
  • the web 7 of the U-shaped heat sink 2 touches its outer surface 8 over a large area the bottom 13 of the housing 11th
  • the thermal contact of the housing base 13 is special favorable if the housing 11 on metal, good heat dissipation Surfaces is assembled.
  • the projections 15 for receiving terminals for connecting the coil 3 of the electromagnet 1 having.
  • the at least partially with the U-shaped heat sink 2 has a positive locking plate 14 further projections 16 for adjusting the electromagnet 1.

Description

Die Erfindung bezieht sich auf einen Elektromagneten mit einer Spule, mit mindestens zwei diese Spule umgebenden Metallaußenflächen und mit einem Wärmeableitkörper mit mindestens einer zum Wärmetransport dienenden Außenfläche.The invention relates to an electromagnet with a Coil with at least two metal outer surfaces surrounding this coil and with a heat sink with at least an outer surface for heat transport.

Die DE-H 97 10 VII c/21g - 25.9.52 offenbart einen Elektromagneten einer Spule mit mindestens zwei diese Spule umgebenden Metallaußenflächen und mit einem Wärmeableitkörper mit mindestens einer zum Wärmetransport dienenden Außenfläche.DE-H 97 10 VII c / 21g - 25.9.52 discloses an electromagnet a coil with at least two surrounding this coil Metal outer surfaces and with a heat sink at least one outer surface for heat transport.

Dabei erfolgt die Kühlung des Elektromagneten über den Flansch, an den eine gut wärmeleitende Metailplatte mit einer Rippenanordnung angebracht ist.The electromagnet is cooled via the Flange to which a good heat-conducting metal plate with a Rib arrangement is attached.

Elektromagneten finden bei Schaltgeräten, insbesondere Sicherheitspositionsschaltern, vielfältige Anwendung. Bei Dauereinschaltung des Elektromagneten erwärmt sich dieser und kann zu einer unzulässigen Aufwärmung des Geräts führen. Um dies zu verhindern, wurden bisher unterschiedliche Lösungen angewandt. Eine Möglichkeit besteht darin, relativ große Metallgehäuse zu verwenden, mit denen der Elektromagnet direkt verschraubt wird. Die Wärme wird hier gut in die Gehäusewände abgeleitet. Allerdings muß hier für eine Abdichtung der Verschraubung gegen Eindringen des Wassers gesorgt werden. Alternativ werden großvolumige Elektromagneten verwendet, die relativ teuer sind und vor allem das Gerät vergrößern und schwerer machen. Diese Magnete haben außerdem einen Anker mit großer Masse, der Probleme hinsichtlich Stößen, Schocks oder Vibrationen nach sich zieht.Electromagnets are found in switching devices, in particular Safety position switches, diverse application. at Permanent activation of the electromagnet heats it up and can lead to an inadmissible warming up of the device. Around To prevent this, different solutions have so far been found applied. One way is to have relatively large metal housings to use with which the electromagnet directly is screwed. The heat is well here in the housing walls derived. However, the screw connection must be sealed here against water intrusion. alternative large-volume electromagnets are used, which are relatively expensive and, above all, enlarge the device and make it harder. These magnets also have an anchor large mass, problems with bumps, shocks or Vibrations.

Eine weitere Möglichkeit besteht darin, den Elektromagneten mit einer geeigneten elektronischen Ansteuerung zu versehen, die nur während des kurzen Anzugsmoments den Magneten mit hoher Leistung versorgt und danach auf eine geringere Halteleistung zurückschaltet. Allerdings ist diese Lösung mit hohen Kosten für die Elektronik verbunden, die zudem empfindlich ist. Schließlich ist noch eine Lösung mit einem Anzugsund einem Haltemagneten in Verbindung mit einer entsprechenden Umschaltelektronik bekannt.Another option is the electromagnet to be equipped with a suitable electronic control, which only with the magnets during the short tightening torque high power and then on a lower holding power back on. However, this solution is with high costs associated with electronics, which is also sensitive is. Finally there is a solution with a suit and a holding magnet in connection with a corresponding one Switching electronics known.

Der Erfindung liegt die Aufgabe zugrunde, einen Elektromagneten der oben genannten Art mit einem Wärmeableitsystem zu versehen, das eine gute Ableitung der Wärmeenergie ermöglicht und somit eine unzulässige Erwärmung verhindert.The invention has for its object an electromagnet of the type mentioned above with a heat dissipation system provided that allows a good dissipation of the thermal energy and thus prevents excessive heating.

Die Aufgabe wird dadurch gelöst, daß der als nicht zum Elektromagneten gehöriges, gesondertes Bauteil ausgebildete Wärmeableitkörper den Elektromagneten mindestens teilweise umgreift, und daß der Wärmeableitkörper zwei Schenkel mit jeweils einer Innenfläche aufweist, die an einer der Metallaußenflächen großflächig anliegt, so dass der Wärmeableitkörper eine Wärmebrücke von den Metallaußenflächen über die Innenflächen der Schenkel zu seinen Außenflächen bildet.The problem is solved in that the formed as a separate component not belonging to the electromagnet encompasses the electromagnet at least partially, and that the heat sink two legs, each with an inner surface has a large area on one of the metal outer surfaces is applied, so that the heat dissipation body a thermal bridge from the Metal outer surfaces over the inner surfaces of the legs to his Forms outside surfaces.

Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen.Advantageous developments of the invention are the subclaims refer to.

Wird der Wärmeableitkörper U-förmig ausgeführt, so stehen zusätzliche Wärmeableitflächen zur Verfügung, und es kann innerhalb des Wärmeableitkörpers ein entsprechend guter Wärmeausgleich stattfinden.If the heat sink is U-shaped, there are additional ones Heat dissipation surfaces are available and it can be inside the heat dissipation body a correspondingly good heat balance occur.

Vorteilhafter Weise ist der Elektromagnet in einem Gehäuse eines elektrischen Schaltgeräts, insbesondere eines Positionsschalters, mit Gehäusewänden eingebaut, und der Wärmeableitkörper bildet mindestens zu einer der Gehäusewände eine Wärmebrücke.The electromagnet is advantageously in a housing an electrical switching device, in particular a position switch, with housing walls installed, and the heat sink forms at least one of the housing walls Thermal bridge.

Eine weitere vorteilhafte Ausführungsform besteht, wenn die Schenkel jeweils eine Wärmebrücke zu einer der Gehäusewände bilden. Dies wird besonders vorteilhaft erreicht, wenn die Schenkel mit ihrer Außenfläche jeweils an einer der Gehäusewände großflächig anliegen. Another advantageous embodiment is when the Legs each have a thermal bridge to one of the housing walls form. This is achieved particularly advantageously if the Leg with its outer surface on one of the housing walls large-scale.

Um die Wärmeabführung weiterhin zu verbessern, ist es vorteilhaft, wenn der die Schenkel verbindende Steg eine Wärmebrücke zu einer der Gehäusewände bildet, was vorteilhaft dadurch erreicht wird, daß der die Schenkel verbindende Steg an einer der Gehäusewände großflächig anliegt. Dies kann z.B. der Gehäuseboden sein, der bei Verschraubung auf einer Metallplatte einen besonders guten Wärmetransport sicherstellt.In order to further improve the heat dissipation, it is advantageous if the web connecting the legs is a thermal bridge to one of the housing walls, which is advantageous is achieved that the web connecting the legs on one of the housing walls lies over a large area. This can e.g. be the bottom of the case, that when screwed onto a metal plate ensures particularly good heat transfer.

Ist eine mit dem Wärmeleitkörper in Formschluß stehende Halteplatte mit ersten Anformungen zur Justage des Elektromagneten vorgesehen, so wird auf einfache Weise die Justage des Elektromagneten in Bezug auf den Wärmeableitkörper erreicht.Is a holding plate in positive engagement with the heat-conducting body with first formations for adjusting the electromagnet provided, the adjustment of the Electromagnets achieved in relation to the heat sink.

Vorteilhafterweise weist die Halteplatte zwei Anformungen zur Aufnahme von Anschlußklemmen auf, wodurch auf einfache Weise der Anschluß der Spule ermöglicht wird.The holding plate advantageously has two projections Inclusion of terminals on, which makes it easy the connection of the coil is made possible.

Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand einer Zeichnung näher erläutert. Es zeigen:

FIG 1
eine perspektivische Darstellung eines Elektromagneten und eines zugehörigen Wärmeableitkörpers,
FIG 2
eine Draufsicht auf ein Gehäuse mit eingebautem Elektromagneten und Wärmeableitkörper,
FIG 3
eine Schnittansicht eines Gehäuses mit Elektromagneten und Wärmeableitkörper und
FIG 4,5
Ansichten einer zum Anschluß und Justierung des Elektromagneten dienenden Halteplatte.
An embodiment of the invention is explained below with reference to a drawing. Show it:
FIG. 1
1 shows a perspective illustration of an electromagnet and an associated heat dissipation body,
FIG 2
a plan view of a housing with built-in electromagnet and heat sink,
FIG 3
a sectional view of a housing with electromagnet and heat sink and
FIG 4.5
Views of a holding plate used to connect and adjust the electromagnet.

In Figur 1 ist ein Elektromagnet 1 mit einem zugehörigen Wärmeableitkörper 2 dargestellt. Der Elektromagnet 1 weist eine Spule 3 und ein diese umgebendes Joch 4 mit Metallaußenflächen 5 auf. Der Wärmeableitkörper 2 ist hier U-förmig mit zwei Schenkeln 6 und einem diese verbindenden Steg 7 ausgeführt. Die Außenfläche des Stegs 7 trägt das Bezugszeichen 8, die Außenflächen der Schenkel 6 tragen das Bezugszeichen 9. Die Innenflächen 10 der Schenkel 6 liegen im zusammengebauten Zustand großflächig an den Metallaußenflächen 5 an, so daß ein guter Wärmetransport zwischen dem Joch 4 und dem Wärmeableitkörper 2 möglich ist.In Figure 1 is an electromagnet 1 with an associated heat sink 2 shown. The electromagnet 1 has one Coil 3 and a yoke 4 surrounding it with metal outer surfaces 5 on. The heat sink 2 is U-shaped here two legs 6 and a web 7 connecting them. The outer surface of the web 7 bears the reference number 8, the outer surfaces of the legs 6 have the reference number 9. The inner surfaces 10 of the legs 6 are in the assembled state Condition over a large area on the metal outer surfaces 5, so that a good heat transfer between the yoke 4 and the heat sink 2 is possible.

In den Figuren 2 und 3 ist der Einsatz des Elektromagneten 1 mit dem Wärmeableitkörper 2 bei einem elektrischen Schaltgerät mit einem Gehäuse 11 dargestellt. Dies kann z.B. das gekapselte Gehäuse eines Positionsschalters sein. Figur 2 zeigt die Einbaulage des Elektromagneten 1 mit dem U-förmigen Wärmeableitkörper 2, dessen Schenkel mit den Außenflächen 9 großflächig an den Gehäusewänden 12 anliegen.FIGS. 2 and 3 show the use of the electromagnet 1 with the heat sink 2 in an electrical switching device shown with a housing 11. This can e.g. the encapsulated Housing of a position switch. Figure 2 shows the installation position of the electromagnet 1 with the U-shaped Heat dissipation body 2, the legs with the outer surfaces 9 rest on the housing walls 12 over a large area.

Der Steg 7 des U-förmigen Wärmeableitkörpers 2 berührt mit seiner Außenfläche 8 großflächig den Boden 13 des Gehäuses 11.The web 7 of the U-shaped heat sink 2 touches its outer surface 8 over a large area the bottom 13 of the housing 11th

Um eine gute Wärmeleitung zu erreichen, ist es wichtig, daß der Wärmeableitkörper 2 plan, flächig und kraftschlüssig die angrenzenden Flächen 12 und 13 berührt. Durch Einbringen einer Wärmeleitpaste an den Übergangsflächen kann bei Bedarf der Wärmefluß weiter verbessert werden. Durch geschickte Ausformung des Wärmeableitkörpers 2 wird erreicht, daß der Außenkontakt zum Gehäuse 11 erheblich größer als die Kontaktfläche zum Elektromagneten 1 ist.In order to achieve good heat conduction, it is important that the heat dissipation body 2 flat, flat and non-positive adjacent surfaces 12 and 13 touched. By introducing one Thermal paste on the transition surfaces can if necessary the heat flow can be further improved. By clever shaping of the heat sink 2 is achieved that the External contact to the housing 11 is considerably larger than the contact area to the electromagnet 1.

Die Wärmekontaktierung des Gehäusebodens 13 ist besonders günstig, wenn das Gehäuse 11 auf metallene, gut die Wärme ableitende Flächen montiert wird.The thermal contact of the housing base 13 is special favorable if the housing 11 on metal, good heat dissipation Surfaces is assembled.

Zwischen dem Eltkromagneten 1 und dem Verbindungssteg 7 des U-förmigen Wärmeableitkörpers ist eine Halteplatte 14 gemäß FIG 3 eingelegt, die Anformungen 15 zur Aufnahme von Anschlußklemmen zum Anschluß der Spule 3 des Elektromagneten 1 aufweist. Die zumindest teilweise mit dem U-förmigen Wärmeableitkörper 2 in Formschluß stehende Halteplatte 14 weist weitere Anformungen 16 zur Justage des Elektromagneten 1 auf.Between the Eltkromagneten 1 and the connecting web 7 of the U-shaped heat sink is a holding plate 14 according to FIG 3 inserted, the projections 15 for receiving terminals for connecting the coil 3 of the electromagnet 1 having. The at least partially with the U-shaped heat sink 2 has a positive locking plate 14 further projections 16 for adjusting the electromagnet 1.

Claims (9)

  1. Electromagnet (1) with a solenoid (3), with at least two external metal surfaces (5) surrounding this solenoid (3) and with a heat-dissipating device (2), characterised in that the heat-dissipating device (2) is not a separate component belonging to the electromagnet (1), that the heat-dissipating device (2) at least partly surrounds the electromagnet (1) with at least one external surface (8, 9) serving to conduct heat, that the heat-dissipating device (2) has two legs (6) each having one internal surface (10), a large area thereof lying against one of the external metal surfaces (5), and that the heat-dissipating device (2) forms a heat bridge from the external metal surfaces (5) to its external surfaces (8, 9) via the internal surfaces (10) of the legs (6).
  2. Electromagnet according to Claim 1, characterised in that the heat-dissipating device (2) is U-shaped.
  3. Electromagnet according to Claim 1 or 2, characterised in that the electromagnet (1) is fitted inside a casing (11) of an electrical switching device, especially a position switch, with casing walls (12, 13) and that the heat-dissipating device (2) forms a heat bridge at least to one of the casing walls (12, 13).
  4. Electromagnet according to Claim 3, characterised in that each leg (6) forms a heat bridge to one of the casing walls (12).
  5. Electromagnet according to one of the preceding Claims 3 or 4, characterised in that a large area of the external surface (9) of each of the legs (6) lies against one of the casing walls (12).
  6. Electromagnet according to Claim 5, characterised in that the cross-piece (7) joining the legs (6) forms a heat bridge to one of the casing walls (13).
  7. Electromagnet according to Claim 6, characterised in that a large area of the cross-piece (7) joining the legs (6) lies against one of the casing walls (13).
  8. Electromagnet according to one of the preceding Claims, characterised in that a retaining plate (14) is provided that is in positive contact with the heat-dissipating device (2) with first cast formations (16) for the adjustment of the electromagnet (1).
  9. Electromagnet according to Claim 8, characterised in that the retaining plate is provided with second cast formations (15) for receiving lead terminals.
EP99119999A 1998-10-27 1999-10-14 Electromagnet with heat transfer body Expired - Lifetime EP0997916B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19849588A DE19849588C1 (en) 1998-10-27 1998-10-27 Electromagnet with heat sink
DE19849588 1998-10-27

Publications (2)

Publication Number Publication Date
EP0997916A1 EP0997916A1 (en) 2000-05-03
EP0997916B1 true EP0997916B1 (en) 2004-04-14

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EP99119999A Expired - Lifetime EP0997916B1 (en) 1998-10-27 1999-10-14 Electromagnet with heat transfer body

Country Status (2)

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EP (1) EP0997916B1 (en)
DE (2) DE19849588C1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110874A (en) * 1961-01-24 1963-11-12 Gen Electric Magnetic core structure
FR2135777A5 (en) * 1971-04-28 1972-12-22 Mecalectro
DE2403287A1 (en) * 1974-01-24 1975-08-07 Krauss Maffei Ag Electro-magnet cooling for suspended rail cars - uses liquid for heat exchangers in thermal contact with field winding
JPS5442603A (en) * 1977-09-09 1979-04-04 Hitachi Ltd Plastic resin moulded electric motor
US4540966A (en) * 1982-11-24 1985-09-10 Albany-Chicago Corporation Multiple magnet core unit
DE3315836A1 (en) * 1983-04-30 1984-10-31 Dornier System Gmbh, 7990 Friedrichshafen Device for cooling electromagnetic coils
US5710745A (en) * 1995-04-07 1998-01-20 Discovision Associates Assembly having flux-directing return yoke for magneto-optical drive
DE29520240U1 (en) * 1995-12-20 1996-02-22 Siemens Ag Electromagnetic relay with heat dissipation

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Publication number Publication date
DE19849588C1 (en) 2000-11-23
DE59909158D1 (en) 2004-05-19
EP0997916A1 (en) 2000-05-03

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