WO2001041164A1 - Procede de production d'une armature pauvre en courants de foucault, destinee a un actionneur electromagnetique - Google Patents

Procede de production d'une armature pauvre en courants de foucault, destinee a un actionneur electromagnetique Download PDF

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Publication number
WO2001041164A1
WO2001041164A1 PCT/EP2000/011869 EP0011869W WO0141164A1 WO 2001041164 A1 WO2001041164 A1 WO 2001041164A1 EP 0011869 W EP0011869 W EP 0011869W WO 0141164 A1 WO0141164 A1 WO 0141164A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide pin
anchor plate
anchor
pressed
armature
Prior art date
Application number
PCT/EP2000/011869
Other languages
German (de)
English (en)
Inventor
Günter Rudolf FEYERL
Michael Schebitz
Original Assignee
Fev Motorentechnik 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 Fev Motorentechnik Gmbh filed Critical Fev Motorentechnik Gmbh
Priority to JP2001542341A priority Critical patent/JP2003515944A/ja
Publication of WO2001041164A1 publication Critical patent/WO2001041164A1/fr

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
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • 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
    • 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
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1676—Means for avoiding or reducing eddy currents in the magnetic circuit, e.g. radial slots
    • 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
    • H01F41/02—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 for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder

Definitions

  • an electromagnetic actuator is formed by at least one electromagnet which can be energized, the pole surface of which is assigned 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 into contact.
  • 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.
  • 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 switching off the holding current and switching on the catching current for the other electromagnet, the gas exchange valve is held in the open position via the armature.
  • a gas exchange valve for example in a four-stroke piston internal combustion engine, is actuated with a very high switching frequency depending on the crankshaft speed.
  • the armature Since, despite the high switching frequencies, the very short switching times must be adhered to very precisely, it is the importance that the armature is designed with low eddy currents so that it can detach itself very quickly from the pole face, for example when the holding current is switched off.
  • 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 in wear and accordingly should preferably be made from 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 to take advantage of the low eddy current formation known from sheet metal yoke bodies of transformers or from electromagnets in the case of yoke bodies laminated in this way.
  • One problem here is the high mechanical stress on the armature plate, which arises each time 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.
  • a method is provided according to the invention in which a green body made of a sinterable powder is used as the raw part on the guide pin made of a hardenable steel material as the anchor plate is pressed, then the blank is heated, sintered and then cooled.
  • a sinterable powder is expediently used, in which the particles made of ferromagnetic material are largely electrically insulated from one another despite the sintering.
  • a sinterable "covering" made of electrically non-conductive materials.
  • the manufacturing process offers a further advantage if the raw part with the fully sintered anchor plate 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, kept at this temperature for a predefinable time and then cooled completely.
  • This procedure takes advantage of the fact that the sintering temperature for the sintering powders in question 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. Without affecting the structure of the sintered anchor plate, 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.
  • the anchor plate can be set up perpendicular to the axis of the guide pin, as is required, for example, for the actuators described at the outset for actuating a gas exchange valve.
  • the connecting approach can also be wing-like radial, ie aligned parallel to the axis of the guide pin, as is required, for example, for an actuator for generating a rotary or pivoting movement, in which the anchor plate does not move back and forth in the longitudinal direction of the axis of the guide pin but is pivoted back and forth rotating about the axis of the guide pin.
  • the preferably thin, web-shaped connecting projection which extends radially into the anchor plate is provided with openings through which the sintered powder is pressed. This ensures that the web-shaped connection approach not only on its outside from
  • Sintered powder is enclosed, but also through the perforations, intermediate areas of the connection attachment are penetrated by the sintered powder and, accordingly, also by the finished sintered material.
  • the openings can be, for example, in the form of closed or laterally open
  • connection approach affects the magnetic and electrical properties of the anchor plate when the material is connected to the guide pin made of tempered steel, it should only have as much "mass” as is absolutely necessary for reasons of strength.
  • the recesses enlarge the "current paths" for corresponding vortex currents and contribute to the reduction of eddy current influences.
  • the connecting attachment has a sleeve-shaped middle part made of solid metal, which is connected to the guide bolt, preferably by brazing, after the anchor plate has been sintered on.
  • the guide bolt is provided with at least one radially oriented, essentially flat connecting projection, which is enclosed by the material of the anchor plate.
  • the flat connection approach with recesses is provided, which are penetrated by the material of the anchor plate.
  • connection attachment can be integrally connected to the guide pin, while in another embodiment the connection attachment has a connection sleeve which encloses a partial area of the guide pin and is preferably connected to it by hard soldering.
  • 1 is an axial section of an armature for an actuator for generating a back and forth movement
  • Fig. 3 shows a section. the line III-III in Fig. 1,
  • Fig. 4 shows a modified embodiment of an anchor.
  • FIG. 1 shows an anchor 1, which consists essentially of a guide pin 2 and an anchor plate 3 firmly connected thereto.
  • the armature is used in an actuator in which a corresponding arrangement of the electromagnets results in a back and forth movement in the direction of the longitudinal axis 5 of the guide bolt 2 (arrows 4).
  • the guide pin 2 has a web-shaped extension 6 at one end, for example in the form of a circular collar, which is enclosed by the material of the anchor plate 3.
  • the web-shaped extension 6 is shown only schematically with a large number of provided openings 7, which can be arranged for example in the manner shown in Fig. 3.
  • the web-shaped extension 6 can also be formed by radially oriented arms or fingers, so that the material of the anchor plate completely surrounds it. The spaces between the arms represent openings in the sense of the invention.
  • the shape, size and contour of the openings 7 or the parts of the web material delimiting them can be designed as desired if only the conditions for strength and eddy current behavior are observed.
  • the anchor plate 3 is pressed as a so-called green body from a sinterable powder, which contains ferromagnetic material, from the guide bolts 2, which are made from a hardenable steel material.
  • the pressing process gives the anchor plate its desired dimensions, with some of the powder being pressed through the openings 7 and thus, despite the relatively wide extension of the web-shaped extension 6 into the material of the anchor plate, also in the area directly in the vicinity of the guide pin a continuous connection of the sintered material to both sides of the web-shaped extension 6 is created. All edges and transitions of the web-shaped extension 6, which are enclosed by the material of the anchor plate 3, must be well rounded in order to avoid notch effects which could lead to cracks when the anchor is subjected to mechanical stress.
  • the raw part thus produced is then heated to sintering temperature and cooled again after the anchor plate has been sintered.
  • the unmachined part can either be completely cooled or, at least once, "heated” to the tempering temperature of the steel material used for the guide pin 2 and kept at this temperature for a predetermined time and then completely cooled. Since the tempering temperature for the

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Valve Device For Special Equipments (AREA)
  • Electromagnets (AREA)
  • Magnetically Actuated Valves (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention concerne un procédé de production d'une armature (1), destinée à être utilisée en tant qu'élément de réglage dans un actionneur électromagnétique, ladite armature comprenant une plaque d'armature (3) qui est reliée à un axe de guidage (2). Le procédé selon cette invention est caractérisé en ce que, en tant qu'ébauche, un compact vert servant de plaque d'armature (3), constitué d'une poudre contenant un matériau ferromagnétique pouvant être fritté, est pressé contre l'axe de guidage (2), qui est constitué d'un matériau en acier apte au traitement par trempe et revenu, cette ébauche est ensuite chauffée à une température de frittage, puis est refroidie.
PCT/EP2000/011869 1999-12-04 2000-11-28 Procede de production d'une armature pauvre en courants de foucault, destinee a un actionneur electromagnetique WO2001041164A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001542341A JP2003515944A (ja) 1999-12-04 2000-11-28 電磁式のアクチュエータ用の渦電流の少ないアーマチュアを製造する方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19958574.1 1999-12-04
DE1999158574 DE19958574A1 (de) 1999-12-04 1999-12-04 Verfahren zur Herstellung eines wirbelstromarmen Ankers für einen elektromagnetischen Aktuator

Publications (1)

Publication Number Publication Date
WO2001041164A1 true WO2001041164A1 (fr) 2001-06-07

Family

ID=7931475

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/011869 WO2001041164A1 (fr) 1999-12-04 2000-11-28 Procede de production d'une armature pauvre en courants de foucault, destinee a un actionneur electromagnetique

Country Status (3)

Country Link
JP (1) JP2003515944A (fr)
DE (1) DE19958574A1 (fr)
WO (1) WO2001041164A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009047525A1 (de) * 2009-12-04 2011-06-09 Robert Bosch Gmbh Elektromagnetisch betätigbares Ventil
DE102011077179A1 (de) * 2011-06-08 2012-12-13 Robert Bosch Gmbh Anker für ein Magnetventil und Verfahren zur Herstellung eines Ankers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402093A (en) * 1992-05-29 1995-03-28 Thomas Magnete Gmbh Electromagnet having an armature with an injection-molded guide or control rod
US5903204A (en) * 1997-04-11 1999-05-11 Fev Motorentechnik Gmbh & Co. Kg Electromagnetic actuator armature having eddy current-reducing means
EP0922520A1 (fr) * 1997-12-09 1999-06-16 Siemens Automotive Corporation Méthode de brasage d'un matériau magnétique doux avec un matériau durci

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402093A (en) * 1992-05-29 1995-03-28 Thomas Magnete Gmbh Electromagnet having an armature with an injection-molded guide or control rod
US5903204A (en) * 1997-04-11 1999-05-11 Fev Motorentechnik Gmbh & Co. Kg Electromagnetic actuator armature having eddy current-reducing means
EP0922520A1 (fr) * 1997-12-09 1999-06-16 Siemens Automotive Corporation Méthode de brasage d'un matériau magnétique doux avec un matériau durci

Also Published As

Publication number Publication date
JP2003515944A (ja) 2003-05-07
DE19958574A1 (de) 2001-06-07

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