EP1955339A1 - Actionneur electromagnetique a aimants permanents disposes en v - Google Patents
Actionneur electromagnetique a aimants permanents disposes en vInfo
- Publication number
- EP1955339A1 EP1955339A1 EP06841833A EP06841833A EP1955339A1 EP 1955339 A1 EP1955339 A1 EP 1955339A1 EP 06841833 A EP06841833 A EP 06841833A EP 06841833 A EP06841833 A EP 06841833A EP 1955339 A1 EP1955339 A1 EP 1955339A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- permanent magnets
- core
- electromagnetic actuator
- coil
- actuator 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.)
- Granted
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
- 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
- Electromagnetic actuator with permanent magnets arranged in V Electromagnetic actuator with permanent magnets arranged in V.
- the invention relates to an electromagnetic actuator comprising permanent magnets arranged in V.
- Document FR 2 865 238 discloses 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 from which branches extend including a central leg around which the coil extends.
- the electromagnet has two permanent magnets which are integrated in the core so that the core channels a flow of the 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 increasing the height of one electromagnet.
- Such an arrangement requires cutting the core plates to allow the insertion of magnets, which mechanically weakens the plates and poses mounting problems.
- the air gap between the core plates and the permanent magnets depends on the cutting precision of the sheets, and is therefore difficult to control.
- an electromagnetic actuator comprising an actuator associated with a movable pallet under the action of at least one electromagnet which comprises a coil, a core adapted to channel a flow of the coil so that it closes in the pallet, the core having a base which extends branches with a central branch around which the coil extends, and two permanent magnets which are associated with the core so that it The last channel channels a flow 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 It is therefore sufficient to exert a pressure force on the end portion to reduce or even cancel the gap between the sheets constituting the core and the permanent magnets.
- FIG. 1 is a partial schematic sectional view of an actuator according to the invention
- FIG. 2 is a partial schematic view the actuator of Figure 1, shown during assembly
- FIG. 3 is a partially broken exploded perspective view of a dual electromagnetic actuator according to the invention.
- the electromagnetic actuator of the invention comprises an electromagnet 1 with a core 2 and a coil 3.
- the electromagnet 1 exerts an electromagnetic force on a fixed pallet 4 in a controlled manner.
- 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.
- Core 2 of electromagnet 1 has a base
- the central branch comprises two portions 12 with facing inclined faces 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 is here turned towards the base 10.
- a wedge 14 forming an end portion of the central branch.
- the path of the fluxes generated by the permanent magnets 13 which pass through the core 2 to close in the pallet 4 is drawn in thick dashed lines in FIG. 1.
- the wedge 14 has an end face 15 on which a groove 17 is 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 constituting the core 2 by assembling the sheets which form the base 10, the side branches 11 and the support portions 12, the permanent magnets 13 are placed on the support portions 12. In this respect, the portions 12 of the support 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 dual actuator for actuating two pushers (not shown).
- the dual actuator comprises two coils 3 and a common core 2 obtained by joining two cores identical to that illustrated in Figure 1 and forming a single branch of the two side 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 nonmagnetic flanges make it possible to exert a pressure force to compensate for, or even cancel, the residual gap which 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 wedge 14 are part of this process. This catching of gaps makes it possible to increase 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 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 lifetime 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 air gap whose influence is preponderant on that of the 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.
- the core 2 comprises a clearance 30 which extends between the permanent magnets 13 at the tip of the V, and in which the tip 31 of the corner 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, to a significant dispersion of the position of the tip 31 along the axis X.
- the clearance 30 allows to absorb this dispersion while avoiding contact between the tip 31 and the rest of the core 2.
- the clearance 30 will be chosen deep enough to form a sufficiently large air gap between the wedge 14 and the base 10 avoiding in use a magnetic flux passage between the wedge 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.
- the invention is not limited to what has just been described, but on the contrary encompasses any variant within the scope defined by the claims.
- 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)
Abstract
Description
Claims
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 true EP1955339A1 (fr) | 2008-08-13 |
EP1955339B1 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 (fr) |
EP (1) | EP1955339B1 (fr) |
JP (1) | JP5394068B2 (fr) |
KR (1) | KR101313478B1 (fr) |
WO (1) | WO2007063223A1 (fr) |
Families Citing this family (2)
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)
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 |
-
2006
- 2006-11-30 KR KR1020087003682A patent/KR101313478B1/ko not_active IP Right Cessation
- 2006-11-30 WO PCT/FR2006/002623 patent/WO2007063223A1/fr active Application Filing
- 2006-11-30 EP EP06841833.4A patent/EP1955339B1/fr not_active Not-in-force
- 2006-11-30 US US12/091,763 patent/US7900885B2/en not_active Expired - Fee Related
- 2006-11-30 JP JP2008542798A patent/JP5394068B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007063223A1 * |
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 |
WO2007063223A1 (fr) | 2007-06-07 |
EP1955339B1 (fr) | 2016-06-15 |
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