EP1481406A1 - Actionneur electromagnetique a force d attraction controlee. - Google Patents
Actionneur electromagnetique a force d attraction controlee.Info
- Publication number
- EP1481406A1 EP1481406A1 EP03720653A EP03720653A EP1481406A1 EP 1481406 A1 EP1481406 A1 EP 1481406A1 EP 03720653 A EP03720653 A EP 03720653A EP 03720653 A EP03720653 A EP 03720653A EP 1481406 A1 EP1481406 A1 EP 1481406A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- pallet
- recessed portion
- electromagnetic actuator
- zone
- 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
- 230000004907 flux Effects 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 6
- 230000004888 barrier function Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
Definitions
- the invention relates to an electromagnetic actuator, in particular an electromagnetic direct current actuator for actuating a motor valve.
- Electromagnetic actuators comprising an actuating rod connected to a pallet to form a mobile assembly associated with a motor member which propels the mobile assembly from one extreme position to another, the extreme positions corresponding to the open and closed positions of the valve.
- the drive member comprises at least one coil fitted with a core, one face of the pallet being adapted to come into contact with one face of the core of the coil when the valve is in one of the open or closed positions.
- the spool is used to move the pallet and to hold it to keep the mobile assembly in the corresponding extreme position.
- the coil is connected to a DC power supply device.
- the coil is supplied with current, which has the effect of creating a magnetic flux which closes in the pallet. The coil thus exerts an attraction force on the pallet.
- the total air gap which the flow between the pallet and the core must cross.
- the coil must then be supplied with a current of high intensity so that the attraction force which it develops overcomes the resistant force which the mobile assembly undergoes.
- the attraction force exerted by the reel on the pallet at the end of the travel greatly exceeds the resistant force exerted on the mobile assembly.
- the pallet therefore arrives against the core with a high speed, which produces an undesirable clicking noise, and prevents good control of the speed of approach of the valve against its seat in the closed position.
- the pallet is generally sized to operate at the limit of magnetic saturation for the maximum flux developable by the coil which is established when the pallet is distant from the core. Limiting the flow would certainly reduce the attraction force at the end of the stroke, but would degrade the performance of the actuator when the paddle is far from the core.
- the invention aims to propose a means for adapting the force of attraction of the coil on the pallet at the end of the stroke, without degrading the performance of the actuator when the pallet is distant from the core.
- an electromagnetic actuator comprising an actuating member connected to a pallet which is movable under the effect of a motor member comprising at least one coil to generate a magnetic flux in a core having a face extending opposite a face of the pallet, at least one of the opposite faces comprising at least one recessed portion, the pallet and the core being according to the invention arranged to define in a first zone of the pallet and from the nucleus encompassing the recessed portion, a first magnetic path tick which is interrupted by an air gap at least equal to the withdrawal of the recessed portion when the pallet is in contact with the core, and, in a second zone of the pallet and of the core excluding the recessed portion, a second magnetic path which is interrupted only by a residual air gap when the pallet is supported on the core, the recessed portion having a total area at most equal to an area bringing the magnetic flux to saturation in the second area of the pallet.
- the value of the flux in the core is determined mainly by the distance between the pallet and the core , so that the recessed portion has only a negligible influence on the performance of the actuator.
- the withdrawal of the recessed portion becomes significant with respect to the residual space remaining between the facing faces. The total air gap that the flow must cross in the first zone is therefore increased. For a given current, the attraction force exerted by the coil on the pallet is therefore reduced.
- the invention makes it possible, for the same dynamics of the supply electronics, to reduce the attraction force at the end of the stroke, so that the pallet arrives less quickly against the core and the clicking noise is finds it diminished.
- the invention therefore makes it possible to increase the variation in the attraction force for a given current variation.
- the presence of the recessed portions causes a correlative increase in the current for holding the pallet against the core.
- the recessed portion advantageously extends over the face of the pallet opposite at least one of the branches of the core.
- the pallet has recessed portions which each extend opposite one of the lateral branches of the core, preferably symmetrically with respect to the actuating member .
- the recessed portion projects transversely from the branch opposite a distance at least equal to the withdrawal of the withdrawal portion relative to the face of the pallet.
- the recessed portion extends transversely to the three branches, opposite each of them.
- the first zone and the second zone are magnetically isolated.
- the core is composed of a stack of sheets, at least one magnetic barrier being inserted in the stack of sheets to separate the sheets making up the first zone and the second zone of the core.
- Figure 1B is a schematic sectional view along the plane IB of Figure 2B in which the pallet is illustrated in contact with the core;
- FIG. 2A is a partial perspective view of a first embodiment of the invention in which the pallet is illustrated remote from the core, the conductor of the coil having been omitted;
- Figure 2B is a partial view similar to Figure 2A in which the pallet is illustrated in contact with the core;
- FIG. 3A is a partial perspective view of a second embodiment of the invention in which the pallet is illustrated remote from the core, the conductor of the coil having been omitted;
- Figure 3B is a view similar to Figure 3A in which the pallet is illustrated in contact with the core;
- FIG. 4 is a partial perspective view of an actuator according to a variant of the second embodiment of the invention.
- FIG. 5 is a schematic side view of the actuator of Figures 3A and 3B;
- FIG. 6 is a schematic side view of the actuator of Figure 4.
- the actuator illustrated comprises in a manner known per se two coils arranged opposite one another.
- a single coil 1 has been shown to lighten the drawing.
- the coil 1 comprises a core 2 having a central branch 3 and two lateral branches 4.
- a conductor 5, the turns of which can be seen in section, is wound around the central branch 3 of the core 2.
- An actuating rod 6 is mounted sliding in a bore of the central branch 3 in a direction perpendicular to a face 7 of the core 2 defined by the end of the central branch 3 and the lateral branches 4.
- the actuating rod 6 is integral with a pallet 8 which has a face 9 parallel to the face 7 of the core 2, and which is forced to move between the coils.
- An electronic DC power supply supplies the conductor 5 with direct current to establish a flow 11 between the core 2 and the pallet 8 in order to exert on the pallet 8 an attraction force.
- the magnetic flux 11 circulates in the core 2 through the central branch 3 and each of the lateral branches 4.
- the magnetic flux 11 closes in the pallet 8 by crossing a total air gap equal to the space separating the pallet 8 from the core 2 at the level of the central branch 3 increased by the space separating the pallet 8 from the core 2 at the level of each lateral branch 4.
- the faces of the pallet 8 each have four adaptation portions 10 set back from a withdrawal distance r relative to the face carrying the recessed portion 10 considered.
- the recessed portions 10 each extend opposite one of the lateral branches 4 of the core 2 and are arranged symmetrically with respect to the actuating rod 6.
- the recessed portions 10 are illustrated on each of the faces of the pallet 8 because the pallet 8 also cooperates with another coil, not shown, which extends opposite the other face of the pallet 8. For the purposes of the description, only the recessed portions 10 taken in face 9 opposite the core will be taken into account.
- the pallet 8 In the position illustrated in FIG. 1A, the pallet 8 is distant from the core 2 and the withdrawal r of the recessed portions 10 is negligible compared to the distance d measured between the face 9 of the pallet 8 and the face 7 of the core 2.
- L 'total air gap that must cross the flow is therefore substantially equal to twice the distance d, the presence of the recessed portions 10 having a negligible influence.
- the withdrawal r is of the order of
- the attraction force exerted by the coil 1 is therefore not disturbed by the presence of the recessed portions 10 when the pallet 8 is still far from the core 2.
- the attractive force exerted by the coil 1 on the pallet 8 varies in inverse function to the square of the air gap.
- the force of attraction is therefore very significantly reduced with respect to the recessed portions so that, for a given current reduction dynamic, the invention makes it possible to reduce the speed of the pallet more rapidly when it comes into contact with the core.
- the additional air gap of the recessed portions reduces the inductive effect of the pallet on the coil 1 and therefore makes it possible to improve the dynamics of reduction of the current in the coil.
- the recessed portions 10 do not extend over the entire length of the lateral branches 4, but only over part of it.
- the recessed portions 10 longitudinally delimit a first zone 12 of the pallet 8 and of the core 2 for which the total air gap to be crossed by the flow is substantially equal to the withdrawal r of the recessed portions 10, and a second zone 13 of the pallet 8 and of the core 2 for which the total air gap is equal to twice the residual space • ⁇ between the faces 7 and 9.
- the total area of the recessed portions will be limited to 50% of the total area of the faces opposite the pallet and the core.
- the recessed portions 10 project transversely from the side branch opposite over a distance 1 at least equal to the withdrawal r of the recessed portion.
- the recessed portions 10 are delimited transversely by a leave 14 of radius equal to the withdrawal r of the recessed portions 10, the center of the leave 14 being situated substantially at the level of the internal edge 15 of the lateral branch. 4 when the pallet 8 is in contact with the core 2.
- the core 2 is advantageously composed of a stack of cut sheets which limit the longitudinal migration of the flow. This arrangement counteracts the tendency of the flow normally expected to be established in zone 12 to migrate towards zone 13 where the total air gap is weaker.
- a magnetic barrier 16 for example a piece of non-magnetic material of the same shape as the sheets forming the core, may be inserted in the stack of sheets to magnetically isolate the part of the core corresponding to the zone 12 of the corresponding core part in zone 13.
- the recessed portions are formed by steps 17 which extend transversely opposite the central branch 3 and the lateral branches 4 of the core 2.
- the withdrawal of the recessed portion affects the flow not only in its passage between a lateral branch and the pallet but also in its passage between the central branch and the pallet.
- the step 17 is easier to machine than the recessed portions 10 illustrated in FIGS. 2A and 2B and eliminates any risk of parasitic passage of magnetic flux through the internal edge 15 of the lateral branches 4.
- the step 17 delimits two zones 12 and 13 in the same way as in the previous embodiment. In the zone 12 corresponding to the step 17, the flow must cross once the withdrawal r of the step 17 in the air gap with the central branch 3 and once the same distance in the air gap with the side branches to be able to establish. For the same weakening as in the first embodiment, it therefore suffices that the withdrawal r of the step 17 is equal to half the distance of withdrawal of the recessed portions 10.
- the step 17 is replaced by a bevel 18.
- the distance between the face 7 of the core 2 and the bevel 18 is not constant but increases with the distance from the center of the pallet 8.
- the bevel 18 has the same effect as step 17, but it avoids unwanted side effects that could occur along the edge of step 17.
- FIG. 6 a pallet 8 with bevel 18 has been illustrated in the same configuration as above. It can be seen that the distance between the face 7 of the core 2 and the bevel 18 remains increasing in the direction of the end of the pallet, the risk of concentration of the magnetic flux on the terminal edge 20 of the pallet 8 being then avoided.
- the recessed portions have been illustrated in the form of a step or even a bevel, the recessed portions may more generally take any form capable of ensuring a space between the recessed portions and the facing face when the two faces are in contact, for example a series of grooves.
- the recessed portions may also be produced on the face of the core or simultaneously on the pallet and the core although this solution appears a priori more complex to realize that the recessed portions on the pallet.
- the sides of the paper have been illustrated lette and the core as being flat, the faces may take any complementary shape capable of allowing their contact outside the recessed portions.
- the recessed portions may be delimited by any other form provided that the recessed portions project transversely from the lateral branch opposite a distance at least ' equal to the withdrawal distance.
- the recessed portions extend opposite the lateral branches, or straddling the central branch and the lateral branches, provision may also be made for recessed portions which extend only opposite the central branch.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnets (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0202631A FR2836755B1 (fr) | 2002-03-01 | 2002-03-01 | Actionneur electromagnetique a force d'attraction controlee |
FR0202631 | 2002-03-01 | ||
PCT/FR2003/000658 WO2003075293A1 (fr) | 2002-03-01 | 2003-02-28 | Actionneur electromagnetique a force d'attraction controlee. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1481406A1 true EP1481406A1 (fr) | 2004-12-01 |
EP1481406B1 EP1481406B1 (fr) | 2007-11-28 |
Family
ID=27741368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03720653A Expired - Lifetime EP1481406B1 (fr) | 2002-03-01 | 2003-02-28 | Actionneur electromagnetique a force d attraction controlee. |
Country Status (8)
Country | Link |
---|---|
US (1) | US7042321B2 (fr) |
EP (1) | EP1481406B1 (fr) |
JP (1) | JP4473582B2 (fr) |
AU (1) | AU2003224230A1 (fr) |
DE (1) | DE60317777T2 (fr) |
ES (1) | ES2299696T3 (fr) |
FR (1) | FR2836755B1 (fr) |
WO (1) | WO2003075293A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006223081A (ja) * | 2005-01-14 | 2006-08-24 | Matsushita Electric Ind Co Ltd | アクチュエータ構造およびそれを用いたアクチュエータブロック、ならびに電子機器 |
FR2925754B1 (fr) * | 2007-12-20 | 2015-06-05 | Valeo Sys Controle Moteur Sas | Ensemble d'un electroaimant et d'une palette d'electroaimant et actionneur de soupape comprenant un tel ensemble |
DE102013220853A1 (de) * | 2013-10-15 | 2015-04-16 | Continental Automotive Gmbh | Verfahren zum Ansteuern einer elektromagnetischen Stellvorrichtung mit einer Spule |
CN105090295B (zh) * | 2014-05-19 | 2018-07-06 | 三菱电机株式会社 | 电磁制动装置及使用该电磁制动装置的电梯装置 |
JP6293069B2 (ja) * | 2014-05-19 | 2018-03-14 | 三菱電機株式会社 | 電磁ブレーキ装置およびそれを用いたエレベータ装置 |
CN108999899A (zh) * | 2018-09-25 | 2018-12-14 | 日立电梯电机(广州)有限公司 | 制动器及电梯制动结构 |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR579885A (fr) * | 1923-05-17 | 1924-10-25 | Reyrolle A & Co Ltd | Perfectionnements aux électro-aimants à courant alternatif |
FR1109598A (fr) * | 1954-08-04 | 1956-01-31 | App V F B | Dispositif anti-rémanent pour circuits magnétiques |
IL54107A (en) | 1978-02-22 | 1981-06-29 | Yeda Res & Dev | Electromagnetic linear motion devices |
JP2533741B2 (ja) | 1991-07-30 | 1996-09-11 | オーラ システムズ,インコーポレーテッド | 可変ゲインサ―ボ補助装置 |
US5548263A (en) | 1992-10-05 | 1996-08-20 | Aura Systems, Inc. | Electromagnetically actuated valve |
US5515818A (en) | 1993-12-15 | 1996-05-14 | Machine Research Corporation Of Chicago | Electromechanical variable valve actuator |
US5636601A (en) | 1994-06-15 | 1997-06-10 | Honda Giken Kogyo Kabushiki Kaisha | Energization control method, and electromagnetic control system in electromagnetic driving device |
JP3186462B2 (ja) | 1994-09-22 | 2001-07-11 | トヨタ自動車株式会社 | 内燃機関の電磁式弁駆動装置 |
US5730091A (en) | 1996-11-12 | 1998-03-24 | Ford Global Technologies, Inc. | Soft landing electromechanically actuated engine valve |
JPH10205314A (ja) | 1996-12-13 | 1998-08-04 | Fev Motorentechnik Gmbh & Co Kg | ガス交換弁の電磁弁駆動部を制御する方法 |
US5961097A (en) | 1996-12-17 | 1999-10-05 | Caterpillar Inc. | Electromagnetically actuated valve with thermal compensation |
DE19702130C1 (de) * | 1997-01-22 | 1998-04-23 | Siemens Ag | Gesinterter Anker |
JP3438532B2 (ja) * | 1997-06-04 | 2003-08-18 | トヨタ自動車株式会社 | 電磁駆動弁 |
DE29712502U1 (de) | 1997-07-15 | 1997-09-18 | FEV Motorentechnik GmbH & Co. KG, 52078 Aachen | Elektromagnetischer Aktuator mit Gehäuse |
GB9720911D0 (en) | 1997-10-03 | 1997-12-03 | Britax Rainsfords Pty Ltd | Hall effect sensor system |
FR2784712B1 (fr) | 1998-10-15 | 2001-09-14 | Sagem | Procede et dispositif d'actionnement electromagnetique de soupape |
DE19913050A1 (de) | 1999-03-23 | 2000-09-28 | Fev Motorentech Gmbh | Verfahren zur Erfassung der Position und/oder Bewegungsgeschwindigkeit eines zwischen zwei Schaltstellungen hin und her bewegbaren Stellelements |
JP3733782B2 (ja) * | 1999-04-05 | 2006-01-11 | トヨタ自動車株式会社 | 電磁駆動弁の制御装置 |
JP3508636B2 (ja) * | 1999-08-19 | 2004-03-22 | 日産自動車株式会社 | 電磁駆動吸排気弁の制御装置 |
FR2806146B1 (fr) | 2000-03-10 | 2002-10-25 | Sagem | Dispositif de commande electromagnetique de soupapes, a ressorts pneumatiques |
FR2808375B1 (fr) | 2000-04-27 | 2002-09-06 | Sagem | Actionneur electromagnetique de soupape, de type monobobine |
-
2002
- 2002-03-01 FR FR0202631A patent/FR2836755B1/fr not_active Expired - Fee Related
-
2003
- 2003-02-28 JP JP2003573657A patent/JP4473582B2/ja not_active Expired - Fee Related
- 2003-02-28 ES ES03720653T patent/ES2299696T3/es not_active Expired - Lifetime
- 2003-02-28 WO PCT/FR2003/000658 patent/WO2003075293A1/fr active IP Right Grant
- 2003-02-28 AU AU2003224230A patent/AU2003224230A1/en not_active Abandoned
- 2003-02-28 EP EP03720653A patent/EP1481406B1/fr not_active Expired - Lifetime
- 2003-02-28 DE DE60317777T patent/DE60317777T2/de not_active Expired - Lifetime
- 2003-02-28 US US10/504,740 patent/US7042321B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO03075293A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60317777D1 (de) | 2008-01-10 |
JP4473582B2 (ja) | 2010-06-02 |
JP2005519465A (ja) | 2005-06-30 |
EP1481406B1 (fr) | 2007-11-28 |
FR2836755B1 (fr) | 2004-08-20 |
DE60317777T2 (de) | 2008-11-20 |
WO2003075293A1 (fr) | 2003-09-12 |
US20050083159A1 (en) | 2005-04-21 |
AU2003224230A1 (en) | 2003-09-16 |
ES2299696T3 (es) | 2008-06-01 |
US7042321B2 (en) | 2006-05-09 |
FR2836755A1 (fr) | 2003-09-05 |
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