EP1295302A1 - Anker für einen elektromagnetischen aktuator mit gesinterter ankerplatte - Google Patents
Anker für einen elektromagnetischen aktuator mit gesinterter ankerplatteInfo
- Publication number
- EP1295302A1 EP1295302A1 EP02742895A EP02742895A EP1295302A1 EP 1295302 A1 EP1295302 A1 EP 1295302A1 EP 02742895 A EP02742895 A EP 02742895A EP 02742895 A EP02742895 A EP 02742895A EP 1295302 A1 EP1295302 A1 EP 1295302A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- anchor
- anchor according
- frame element
- guide pin
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
Definitions
- an electromagnetic actuator is formed by at least one electromagnet that can be energized, the pole surface of which is associated with an armature at a distance, which is held in a first switching position via a return spring and, when the electromagnet is energized, against the force of the return spring on the pole surface of the electromagnet is brought to the plant.
- the electromagnet is de-energized, the armature is moved back into the first switching position by the restoring force of the restoring spring.
- the actuating element to be actuated is connected to the armature, so that the armature simultaneously forms part of the actuating element.
- electromagnetic actuators which have two electromagnets with their pole faces facing one another and arranged at a distance from one another, between which the armature connected to the actuating element is moved back and forth against the force of return springs when the electromagnets are suitably energized.
- Such actuators are used, for example, to actuate gas exchange valves on piston internal combustion engines.
- the gas exchange valve is held in the first switching position by the one of the two electromagnets in the closed position, and after the holding current has been switched off and the trapping current has been switched on in the other electromagnet, the gas exchange valve is held in the open position via the armature.
- the anchor plate Since the anchor plate must have soft magnetic properties on the one hand, and on the other hand the anchor plate is connected to a guide pin which must be low-wear and accordingly should preferably be made of a hardenable steel material, it is not possible to anchor the anchor, i.e. Manufacture anchor plate and guide pin from only one material if optimal results are required. Accordingly, it has already been proposed to connect an anchor plate composed of a plurality of metal sheets to a steel guide pin, in order in this way to reduce the stress of. sheet metal yoke bodies of transformers or also of electromagnets known to utilize low eddy current formation in yoke bodies laminated in this way.
- One problem here is the high mechanical stress on the anchor plate. results when it hits the pole face of an electromagnet. ,
- the invention has for its object to provide a low eddy current armature that meets both the mechanical and the electrical requirements.
- an anchor with the means specified in claim 1.
- the frame element enables a secure connection to the guide bolt and, in conjunction with the plate element used, brings about a high structural-dynamic resilience of the anchor with high fatigue strength.
- the plate element consists of a sintered metallurgical powder containing soft magnetic material.
- a sinterable powder is expediently used, in which particles of soft magnetic material despite the sintering are largely electrically isolated from each other.
- This can be brought about by admixing sinterable, electrically non-conductive powder fractions, but preferably by means of powder in which the ferromagnetic or soft-magnetic and / or electrically conductive powder particles are provided with a sinterable "covering" made of electrically non-conductive materials.
- the formation of eddy currents in the finished sintered armature plate is reduced in comparison to a soft magnetic solid metal.
- the plate element consists of punched, stacked sheet metal strips lying next to one another, which are expediently made of thin transformer sheet.
- the anchor according to the invention with a sintered plate element also offers a manufacturing advantage.
- the raw part i.e. the guide pin with the frame element and the completely sintered-in plate element, is rapidly cooled from the sintering temperature to the room temperature range and then heated at least once to the tempering temperature of the steel material of the guide pin, held at this temperature for a specifiable time and then completely is cooled.
- This procedure takes advantage of the fact that the sintering temperature for the sintering powders in question here is considerably higher than the hardness and tempering temperature for a hardenable material, so that after the sintering process has been completed, the further heat treatment can be carried out practically in one heat.
- the temperature control during the heating can be carried out in such a way that the structural changes in the heat-treatable steel material are also taken into account.
- Ren steel material may be useful to gradually heat and keep the temperature at a predetermined temperature during an intermediate temperature stage, in order to allow the structure formation in the steel material to run smoothly here.
- Such a holding time can vary
- the frame element has a sleeve-shaped central part which, after the plate element has been integrated into the frame element, be it by sintering or be soldered to the guide bolt, preferably by brazing, in the case of a plate-packaged plate element.
- a soft magnetic material or a non-magnetizable and / or poorly electrically conductive material with corresponding strength and conductivity properties for the frame element with its sleeve-shaped central part, so that only * the "bare" guide pin consists of a heat treatable steel material and thus consists of a "hard magnetic" material. This prevents the formation of eddy currents from being favored via the frame element in the anchor plate, which would be the case with a material connection with the guide pin made of hard magnetic material. The desired reduction in eddy current formation is thus observed.
- Fig. 1 is an armature for an electromagnetic actuator for generating a back and forth movement in an exploded view
- Fig. 2 shows an axial section through the anchor. the line II-II in Fig. 1,
- Fig. 3 shows a modification of the embodiment.
- FIG. 1 The perspective illustration in the form of the exploded illustration in FIG. 1 shows an anchor 1, which essentially consists of a guide pin 2 and an anchor plate 3.
- the anchor plate 3 has a frame element 4 which is fixedly connected to the guide bolts 2 and which is filled by plate elements 5 made of a ferromagnetic sintered material.
- the armature 1 is used in an actuator in which a corresponding arrangement of the electromagnets whose pole faces are aligned parallel to the armature plate 3 results in a back and forth movement in the direction of the longitudinal axis of the guide bolt 2 (arrows 6).
- the guide pin 2 is connected at one end to the frame element 4, which has a transverse web 4.1 and a circumferential one connected to the transverse web 4.1
- Edge web 4.2 has.
- the frame element 4 comprises the two sintered plate elements 5 in a form-fitting manner.
- a blank is first produced.
- the sinterable powder which contains ferromagnetic, preferably soft magnetic material, is pressed into the frame element 4 connected to the guide pin 2 as a so-called green compact.
- the pressing process gives the anchor plate its desired density, with the powder on the edges of the depressions and / or elevations
- FIGS. 1 and 2 An anchor with a rectangular anchor plate is shown in FIGS. 1 and 2.
- actuators with anchors which have a square or circular contour.
- the contour of the frame element 4 is adapted accordingly to the outer contour of the anchor plate.
- cover plates 10 made of soft magnetic material. These cover plates 10 can be connected to the material of the anchor plate by gluing or soldering.
- the frame element .4 is not integrally connected to the guide pin 2 but has a sleeve-shaped central part 11.
- the frame element 3 with its sleeve-shaped middle part 11 is manufactured in one piece and is pressed according to the method described with reference to FIG. 1 with the sintered material of the plate elements 5, which is then completely sintered.
- the anchor plate obtained in this way which largely consists of a material that prevents the formation of
- a modified embodiment is shown in a perspective view, again in an exploded view.
- a frame element 4 is again provided on the guide pin 2, which has a cross piece 4.1 to which a frame element 4.3 is connected.
- the frame element consists essentially of two parallel U-profiles, which are arranged at the free end of the crossbar 4.1.
- plate elements 5.1 can be inserted, which in the illustrated embodiment consist of a large number of thin ones lying next to one another Sheet metal strips, preferably punched from so-called transformer sheets.
- embossments 12 are created in the sheet metal strips lying one above the other, by means of which the individual sheet metal strips are connected to one another in a positive and frictional manner.
- the frame element 4 is also made of soft magnetic pure iron and is firmly connected to the guide pin as wear-resistant steel by soldering or the like.
- a pole leg 13 of a yoke body of an electromagnet is indicated. At least one second pole leg is arranged parallel to this, so that when energized, the armature plate rests with the area of the frame elements 4.3 on the pole face 13.1.
- a third pole leg is arranged between the two pole legs, which has a bore in which the guide pin 2 is slidably mounted.
- the transverse webs 4.1 extend in the direction of the magnetic flux running between the pole legs 13.
- Sheet metal strips also in the direction of the magnetic flux, with the alignment of the individual sheet metal strips. ochkant. , the formation of eddy currents at the plate level is clearly minimized.
- Fig. 1 can also be provided an additional crossbar that extends perpendicular to the crossbar 4.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnets (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10121492 | 2001-05-03 | ||
DE10121492A DE10121492A1 (de) | 2001-05-03 | 2001-05-03 | Anker für einen elektromagnetischen Aktuator mit gesinterter Ankerplatte |
PCT/EP2002/004126 WO2002091401A1 (de) | 2001-05-03 | 2002-04-13 | Anker für einen elektromagnetischen aktuator mit gesinterter ankerplatte |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1295302A1 true EP1295302A1 (de) | 2003-03-26 |
Family
ID=7683478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02742895A Withdrawn EP1295302A1 (de) | 2001-05-03 | 2002-04-13 | Anker für einen elektromagnetischen aktuator mit gesinterter ankerplatte |
Country Status (4)
Country | Link |
---|---|
US (1) | US6806596B2 (de) |
EP (1) | EP1295302A1 (de) |
DE (2) | DE10121492A1 (de) |
WO (1) | WO2002091401A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1667177A1 (de) * | 2003-09-17 | 2006-06-07 | Hitachi Powdered Metals Co., Ltd. | Gesinterter beweglicher eisenkern und verfahren zu seiner herstellung |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10321015A1 (de) * | 2003-05-10 | 2004-12-02 | Bayerische Motoren Werke Ag | Elektrischer Ventiltrieb für Verbrennungsmotoren mit einem an der Ankerplatte vorgesehenen Wirbelstromkreis |
DE102012224179A1 (de) * | 2012-12-21 | 2014-06-26 | Olympus Winter & Ibe Gmbh | Elektromagnetischer Aktuator für ein chirurgisches Instrument |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2081144A1 (de) * | 1970-03-10 | 1971-12-03 | Pommeret Henri | |
DE19807181A1 (de) * | 1998-02-20 | 1999-08-26 | Bayerische Motoren Werke Ag | Elektromagnetische Schwinganker-Vorrichtung, insbesondere als Aktuator für ein Gaswechselventil einer Kraft- oder Arbeitsmaschine |
US6242840B1 (en) * | 1998-06-15 | 2001-06-05 | Alliedsignal Inc. | Electrical machine including toothless flux collector made from ferromagnetic wire |
DE19904634A1 (de) * | 1999-02-05 | 2000-08-10 | Fev Motorentech Gmbh | Geblechter Anker für einen elektromagnetischen Aktuator |
-
2001
- 2001-05-03 DE DE10121492A patent/DE10121492A1/de not_active Withdrawn
-
2002
- 2002-04-13 EP EP02742895A patent/EP1295302A1/de not_active Withdrawn
- 2002-04-13 DE DE10292024T patent/DE10292024D2/de not_active Expired - Fee Related
- 2002-04-13 WO PCT/EP2002/004126 patent/WO2002091401A1/de not_active Application Discontinuation
- 2002-12-31 US US10/334,150 patent/US6806596B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO02091401A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1667177A1 (de) * | 2003-09-17 | 2006-06-07 | Hitachi Powdered Metals Co., Ltd. | Gesinterter beweglicher eisenkern und verfahren zu seiner herstellung |
EP1667177A4 (de) * | 2003-09-17 | 2009-05-27 | Hitachi Powdered Metals | Gesinterter beweglicher eisenkern und verfahren zu seiner herstellung |
Also Published As
Publication number | Publication date |
---|---|
DE10292024D2 (de) | 2004-04-15 |
DE10121492A1 (de) | 2002-11-07 |
WO2002091401A1 (de) | 2002-11-14 |
US20030205940A1 (en) | 2003-11-06 |
US6806596B2 (en) | 2004-10-19 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20030107 |
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AK | Designated contracting states |
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AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
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17Q | First examination report despatched |
Effective date: 20040219 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHEBITZ, MICHAEL Inventor name: FISCHER, LUTZ Inventor name: FEYERL, GUENTER |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20081103 |