EP1955339B1 - Actionneur electromagnetique à aimants permanents disposes en v - Google Patents

Actionneur electromagnetique à aimants permanents disposes en v Download PDF

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Publication number
EP1955339B1
EP1955339B1 EP06841833.4A EP06841833A EP1955339B1 EP 1955339 B1 EP1955339 B1 EP 1955339B1 EP 06841833 A EP06841833 A EP 06841833A EP 1955339 B1 EP1955339 B1 EP 1955339B1
Authority
EP
European Patent Office
Prior art keywords
permanent magnets
core
electromagnetic actuator
end part
magnets
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.)
Not-in-force
Application number
EP06841833.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1955339A1 (fr
Inventor
Mahmoud Sfaxi
Emmanuel Talon
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.)
Valeo Systemes de Controle Moteur SAS
Original Assignee
Valeo Systemes de Controle Moteur SAS
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
Priority claimed from FR0512241A external-priority patent/FR2894379B1/fr
Priority claimed from FR0512243A external-priority patent/FR2894380B1/fr
Priority claimed from FR0512239A external-priority patent/FR2894378B1/fr
Application filed by Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP1955339A1 publication Critical patent/EP1955339A1/fr
Application granted granted Critical
Publication of EP1955339B1 publication Critical patent/EP1955339B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01F7/1646—Armatures or stationary parts of magnetic circuit having permanent magnet
    • 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
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets
    • 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
    • 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
    • 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
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2146—Latching means
    • F01L2009/2148—Latching means using permanent magnet

Definitions

  • the invention relates to an electromagnetic actuator comprising permanent magnets arranged in V.
  • Document is known FR 2 865 238 an electromagnetic actuator comprising an actuating member associated with a movable pallet under the action of an electromagnet comprising a coil and a core adapted to channel a stream of the coil so that it closes in the pallet, the core having a base of which extends branches with a central branch around which extends the coil.
  • the electromagnet comprises two permanent magnets which are integrated in the core so that the latter channels a flow of permanent magnets so that it closes in the pallet, the magnets being traversed by the flow of the coil.
  • the permanent magnets are arranged obliquely in the lateral branches of the core, which makes it possible to house in the core magnets having a length substantially equal to the height of the coil, without as much increase the height of the electromagnet.
  • US 2005/211200 A1 discloses an electromagnetic actuator according to the preamble of claim 1.
  • the invention relates to an electromagnetic actuator with oblique magnets of easy assembly.
  • an electromagnetic actuator comprising an actuating member associated with a movable pallet under the action of at least one electromagnet which comprises a coil, a core adapted to channel a stream of the coil. so that it closes in the pallet, the core having a base from which branches extend a central branch around which the coil extends, and two permanent magnets which are associated with the core so that the latter channels a flux of permanent magnets so that it closes in the pallet, the magnets being crossed by the flow of the coil.
  • the two magnets are arranged in the central branch of the core to form a V which separates the central branch into a support portion of the magnets secured to the base and an end portion covering the magnets.
  • the core is separated into a main part integrating the support part of the magnets whose access for the establishment of permanent magnets is completely clear, and an end portion which is attached to the magnets arranged on the part of support for styling them, the end portion concentrating itself on the V formed by the permanent magnets.
  • the mounting of the actuator is facilitated
  • the electromagnetic actuator of the invention comprises an electromagnet 1 with a core 2 and a coil 3.
  • the electromagnet 1 exerts a controlled electromagnetic force on a pallet 4 secured to a pusher 5 movable along the X axis.
  • Such an actuator is for example used to actuate an internal combustion engine valve, the actuator being arranged so that the pusher 5 extends along the sliding axis of the valve.
  • the actuator comprises another electromagnet not shown which extends opposite the electromagnet 1 to selectively attract the pallet 4 in the other direction.
  • the end of the pusher 5 and the end of the valve are biased towards each other by unrepresented counter-springs defining an equilibrium position of the pusher / valve assembly in which the pallet extends substantially to halfway between the two electromagnets.
  • the core 2 of the electromagnet 1 comprises a base 10 of which extends two lateral branches 11 and a central branch around which the coil 3 extends.
  • the central branch comprises two portions 12 with faces facing downwards. which are integral with the base 10.
  • the portions 12 form a support portion of the core 2 adapted to receive permanent magnets 13 so that they extend obliquely relative to the axis X and form a V whose tip here is turned towards the base 10. In the V thus formed extends a wedge 14 forming an end portion of the central branch.
  • the path of the fluxes generated by the permanent magnets 13 which transit in the core 2 to close in the pallet 4 is drawn in thick dashed lines on the figure 1 .
  • the wedge 14 has an end face 15 on which a groove 17 extends parallel to the permanent magnets 13.
  • the groove 17 provides a clear separation of the respective flows of the two permanent magnets 13 which pass on either side of the groove 17.
  • the mounting of the actuator is as follows. After having constituted the core 2 by assembling the sheets which form the base 10, the lateral branches 11 and the support portions 12, the permanent magnets 13 are placed on the support portions 12. In this respect, the support portions 12 comprise rims 50 facilitating the positioning of the magnets 13. Then after forming the corner 14 by assembling the corresponding plates, the corner 14 is reported on the permanent magnets 13 as indicated by the arrow. The wedge 14 then caps the permanent magnets 13 and is self-centered by the V formed by the permanent magnets 13.
  • the double actuator comprises two coils 3 and a common core 2 obtained by joining together two cores identical to that illustrated in FIG. figure 1 and forming a single branch of the two lateral branches contiguous.
  • the core 2 comprises central branches around which the coils 3 extend, the central branches having support portions 12 which carry the permanent magnets 13, as well as corners 14.
  • non-magnetic flanges 18 which each comprise on the one hand a slender portion 19 which is housed in the groove 17 of the active face 15 of the wedge 14 and on the other hand tie rods 20 which extend into the through holes of the wedge 14, then between the permanent magnets 13, and finally in the orifices of the core 2 (not visible) to be fixed to this last, for example by screwing or by riveting (alternatively, the tie rods could pass through the core 2 to be fixed directly to the body 100).
  • the non-magnetic flanges make it possible to exert a pressure force to compensate for, or even cancel, the residual gap that may remain due to manufacturing tolerances between, on the one hand, the support portions 12 and the permanent magnets 13, and on the other hand the permanent magnets 13 and the corner 14. This catching air gaps increases the magnetic efficiency of the actuator.
  • the end face 15 of the wedge 14 extends with a recess h with respect to the end faces 16 of the lateral branches 11.
  • the pallet 4 when the pallet 4 abuts against the core 2, it only abuts on the end faces 16 of the lateral branches 11, and not on the central branch.
  • the permanent magnets are very sensitive to shocks.
  • the shrinkage h makes it possible to subtract the permanent magnets 13 from the shocks of the pallet 2 against the core 4, which increases the service life of the actuator.
  • a shrinkage h preferably of the order of a few tenths of a millimeter is preferably chosen, and therefore much larger than the air gaps which are of the order of a few tens of micrometers, so that shrinkage h forms between the pallet and the central branch a large gap whose influence is preponderant on that of residual air gaps when the pallet is close to the core, which allows to reduce or eliminate the effects of magnetic hysteresis caused by residual air gaps.
  • a shrinkage h greater than 0.1 millimeters will preferably be chosen, while remaining less than 0.35 millimeters, so as not to penalize the performance of the actuator.
  • the core 2 has a clearance 30 which extends between the permanent magnets 13 at the tip of the V, and in which is engaged the tip 31 of the wedge 14.
  • the tightening of the wedge 14 by means of the flange 18 can lead due to the relatively acute angle of the wedge 14, a significant dispersion of the position of the tip 31 along the axis X.
  • the clearance 30 absorbs this dispersion while avoiding contact between the tip 31 and the rest of the core 2.
  • the clearance 30 will be selected deep enough to form a sufficiently large air gap between the corner 14 and the base 10 avoiding in use a magnetic flux passage between the corner 14 and the base 10 which would bypass the permanent magnets 13.
  • the clearance 30 forms a non-magnetic zone at the base of the permanent magnets 13 at the point where they form the tip of the V, which allows a clear separation of the fluxes of the permanent magnets 13 in this zone of the core.
  • actuators whose permanent magnets form a V whose tip is turned towards the base of the core
  • the support portions of the magnets secured to the base comprise inclined faces that are no longer facing, but which are turned towards the lateral branches, while the end portion of the central branch will no longer have a wedge shape, but a form of hat.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP06841833.4A 2005-12-02 2006-11-30 Actionneur electromagnetique à aimants permanents disposes en v Not-in-force EP1955339B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR0512241A FR2894379B1 (fr) 2005-12-02 2005-12-02 Actionneur electromagnetique a aimants permanents disposes en v.
FR0512243A FR2894380B1 (fr) 2005-12-02 2005-12-02 Actionneur electromagnetique a aimants permanents disposes en v et a branche centrale en retrait.
FR0512239A FR2894378B1 (fr) 2005-12-02 2005-12-02 Actionneur electromagnetique a aimants permanents disposes en v, avec degagement central.
PCT/FR2006/002623 WO2007063223A1 (fr) 2005-12-02 2006-11-30 Actionneur electromagnetique a aimants permanents disposes en v

Publications (2)

Publication Number Publication Date
EP1955339A1 EP1955339A1 (fr) 2008-08-13
EP1955339B1 true EP1955339B1 (fr) 2016-06-15

Family

ID=37888313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06841833.4A Not-in-force EP1955339B1 (fr) 2005-12-02 2006-11-30 Actionneur electromagnetique à aimants permanents disposes en v

Country Status (5)

Country Link
US (1) US7900885B2 (ko)
EP (1) EP1955339B1 (ko)
JP (1) JP5394068B2 (ko)
KR (1) KR101313478B1 (ko)
WO (1) WO2007063223A1 (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2896080B1 (fr) * 2006-01-12 2008-04-04 Valeo Sys Controle Moteur Sas Actionneur electromagnetique a aimants permanents disposes en v selon un agencement electromagnetiquement optimise
DE102009049009B4 (de) * 2009-10-09 2012-10-04 Pierburg Gmbh Aktuator für eine Verbrennungskraftmaschine

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3241304A (en) * 1962-08-14 1966-03-22 Klinger Mfg Co Ltd Pneumatic bearings and false twisters
US3503019A (en) * 1967-10-26 1970-03-24 Ite Imperial Corp Noise damping means for electromagnet
FR2278191A1 (fr) * 1974-07-13 1976-02-06 Ibm Moteur pas a pas
JPS5355597A (en) * 1976-10-28 1978-05-20 Inoue Japax Res Inc Device for horizontally moving working table or spindle
JPS60200757A (ja) * 1984-03-23 1985-10-11 Yaskawa Electric Mfg Co Ltd ハイブリツド形リニヤパルスモ−タ
JP3593672B2 (ja) * 1998-05-01 2004-11-24 日創電機株式会社 成形機
DE19922422C2 (de) * 1999-05-14 2001-05-03 Siemens Ag Elektromagnetische Stellantriebe
DE10003928A1 (de) 1999-11-25 2001-06-07 Daimler Chrysler Ag Elektromagnetischer Aktuator
JP2002130510A (ja) * 2000-10-18 2002-05-09 Toyota Motor Corp 電磁駆動弁
FR2851291B1 (fr) * 2003-02-18 2006-12-08 Peugeot Citroen Automobiles Sa Actionneur electromecanique de commande de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel actionneur
US7124720B2 (en) * 2004-03-25 2006-10-24 Ford Global Technologies, Llc Permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine
US7249579B2 (en) 2004-03-25 2007-07-31 Ford Global Technologies, Llc Enhanced permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine

Also Published As

Publication number Publication date
US7900885B2 (en) 2011-03-08
KR101313478B1 (ko) 2013-10-01
KR20080073697A (ko) 2008-08-11
US20080283784A1 (en) 2008-11-20
JP2009517996A (ja) 2009-04-30
JP5394068B2 (ja) 2014-01-22
EP1955339A1 (fr) 2008-08-13
WO2007063223A1 (fr) 2007-06-07

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