EP1481406B1 - Elektromagnetischer aktuator mit kontrollierter anziehungskraft - Google Patents

Elektromagnetischer aktuator mit kontrollierter anziehungskraft Download PDF

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Publication number
EP1481406B1
EP1481406B1 EP03720653A EP03720653A EP1481406B1 EP 1481406 B1 EP1481406 B1 EP 1481406B1 EP 03720653 A EP03720653 A EP 03720653A EP 03720653 A EP03720653 A EP 03720653A EP 1481406 B1 EP1481406 B1 EP 1481406B1
Authority
EP
European Patent Office
Prior art keywords
core
pallet
electromagnetic actuator
armature
back portion
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.)
Expired - Lifetime
Application number
EP03720653A
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English (en)
French (fr)
Other versions
EP1481406A1 (de
Inventor
David Walraet
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 Electrification 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
Application filed by Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP1481406A1 publication Critical patent/EP1481406A1/de
Application granted granted Critical
Publication of EP1481406B1 publication Critical patent/EP1481406B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F7/081—Magnetic constructions

Definitions

  • the invention relates to an electromagnetic actuator, in particular a DC electromagnetic 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 unit 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 motor member comprises at least one coil equipped with a core, a face of the pallet being adapted to come into contact with a face of the core of the coil when the valve is in one of the open or closed positions.
  • the coil is used to move the pallet and retain it to keep the moving 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 that closes in the pallet.
  • the coil thus exerts an attraction force on the pallet.
  • the total gap that must cross the flow between the pallet and the core is important.
  • the coil must then be fed with a current of high intensity so that the attraction force it develops overcomes the resistant force experienced by the moving assembly.
  • the attraction force exerted by the coil on the end-of-stroke pallet greatly exceeds the resisting force exerted on the moving assembly.
  • the pallet thus comes against the core with a high speed, which produces an undesirable snap noise, and prevents good control of the speed of docking of the valve against its seat in the closed position.
  • the pallet is generally sized to operate at the magnetic saturation limit for the maximum flux developable by the coil which is established when the pallet is away from the core.
  • a flow limitation would certainly reduce the attraction force at the end of the race, but degrade the performance of the actuator when the pallet is away from the core.
  • An electromagnetic actuator according to the preamble of claim 1 is known from the document JP-A-10332027 .
  • the invention aims to provide a means for adapting the attraction force of the coil on the pallet end of stroke, without degrading the performance of the actuator when the pallet is away 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 for generating a magnetic flux in a core having a face extending facing one side of the pallet, at least one facing face having at least one recessed portion characterized in that the pallet and the core are arranged to define in a first zone of the pallet and the encompassing core the recessed portion, a first magnetic path which is interrupted by an air gap at least equal to the withdrawal of the recessed portion when the pallet bears on the core, and, in a second zone of the pallet and the core excluding the recessed portion, a second magnetic path which is interrupted only by a residual gap when the pallet is supported on the core, the recessed portion having a total area at most equal to an area bringing the saturation magnetic flux in the second zone of the pallet.
  • the value of the flux in the core is determined primarily 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 relative to the residual space remaining between the facing faces. The total 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 reduced.
  • the invention makes it possible, for the same dynamics of the power supply electronics, to lower the attraction force at the end of the stroke, so that the pallet arrives less quickly against the core and the slamming noise found to be diminished.
  • the invention therefore makes it possible to increase the variation of the attraction force for a given current variation.
  • the presence of the recessed portions causes a correlative increase in the holding current of the pallet against the core.
  • the recessed portion advantageously extends on the face of the pallet facing at least one of the branches of the core.
  • the pallet comprises 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 extends transversely of the arm 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.
  • This arrangement avoids the migration of the flow to the second zone where it could more easily be established, which would weaken the effectiveness of the recessed portions.
  • the core is composed of a stack of sheets, at least one magnetic barrier being inserted into the stack of sheets to separate the sheets making up the first zone and the second zone of the core.
  • the illustrated actuator comprises, in a manner known per se, two coils arranged facing 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, whose turns are 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 side branches 4.
  • the actuating rod 6 is secured to a pallet 8 which has a face 9 parallel to the face 7 of the core 2, and which is constrained to move between the coils.
  • DC power supply electronics feeds the DC conductor 5 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 flows in the core 2 through the central branch 3 and each of the lateral branches 4.
  • the magnetic flux 11 is closed in the pallet 8 by crossing a total gap equal to the space separating the pallet 8 from the core 2 to the level the central branch 3 increased the space between the pallet 8 and the core 2 at each lateral branch 4.
  • the faces of the pallet 8 each have four adaptation portions 10 set back 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 not shown reel which extends opposite the other face of the pallet 8. For the purposes of the description, only the recessed portions 10 made in the face 9 facing the nucleus will be taken into consideration.
  • the withdrawal r is of the order of 0.2 millimeters for a maximum distance d of the order of eight millimeters.
  • the attraction force exerted by the coil 1 is not disturbed by the presence of the recessed portions 10 when the pallet 8 is still distant from the core 2.
  • the attraction force exerted by the coil 1 on the pallet 8 varies inversely with the square of the gap.
  • the attraction force is therefore decreased significantly compared to the recessed portions so that for a given current reduction dynamics the invention makes it possible to reduce more quickly the speed of the pallet during its docking on the core.
  • the additional gap of the recessed portions decreases the inductive effect of the pallet on the coil 1 and thus improves the dynamic 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 delimit longitudinally a first zone 12 of the pallet 8 and the core 2 for which the total gap that must cross the flow is substantially equal to the withdrawal r of the recessed portions 10, and a second zone 13 of the pallet 8 and the core 2 for which the total air gap is equal to twice the residual space ⁇ between the faces 7 and 9.
  • the recessed portions protrude transversely from the side branch facing a distance 1 at least equal to the withdrawal r of the recessed portion.
  • the recessed portions 10 are delimited transversely by a fillet 14 equal to the withdrawal r of the recessed portions 10, the center of the fillet 14 being substantially at the internal edge 15 of the side branch 4 when the pallet 8 is in contact with the core 2.
  • This arrangement minimizes the passage of the flow to the zone 13 in the vicinity of the inner edge 15 in which the distance to be crossed would be less than the withdrawal distance of the recessed portions, which would reduce the effectiveness of the recessed portions 10.
  • the core 2 is advantageously composed of a stack of cut sheets which limit the longitudinal migration of the flow. This arrangement contradicts the tendency of the flow normally to be established in the zone 12 to migrate to the zone 13 where the total air gap is lower.
  • 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 into the stack of sheets to magnetically isolate the core portion corresponding to the zone 12 the corresponding core part at zone 13.
  • the recessed portions are formed by steps 17 which extend transversely facing 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 magnetic flux passing through the internal edge 15 of the side branches 4.
  • the step 17 delimits two zones 12 and 13 in the same way as in the preceding embodiment.
  • the flow must cross once the withdrawal r of the step 17 in the gap with the central branch 3 and once the same distance in the air gap with the lateral branches to be able establish.
  • the withdrawal r of the step 17 is equal to half the withdrawal distance 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 relative to in the center of the pallet 8.
  • the bevel 18 has the same effect as the step 17, but it avoids undesirable edge effects that could occur along the edge of the step 17.
  • FIG. 5 the position that the walking pallet 8 is capable of presenting with respect to the core 2 is exaggeratedly illustrated. mounting games of the actuator. It is found that the distance between the face 7 of the core 2 and the bottom of the step 17 decreases toward the end of the blade 8, and the magnetic flux tends to focus at the end edge 19 of the pallet 8, which decreases the performance of the actuator.
  • Figure 6 there is illustrated a palette 8 to bevel 18 in the same configuration as before. It is found that the distance between the face 7 of the core 2 and the bevel 18 remains increasing toward the end of the pallet, the risk of concentrating the magnetic flux on the terminal edge 20 of the pallet 8 is then avoided.
  • recessed portions have been illustrated in the form of a step or bevel, the recessed portions may more generally take any shape that is capable of ensuring a space between the recessed portions and the face opposite when the two faces are in contact, for example a series of grooves.
  • the recessed portions may also be made 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 faces of the pallet and the core being planar, the faces can take any complementary forms able to allow their contact outside the recessed portions.
  • the recessed portions are delimited transversely by a fillet, the recessed portions may be delimited by any other form provided that the recessed portions project transversely of the side branch with respect to a distance of at least equal to the withdrawal distance.

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  • 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)

Claims (10)

  1. Elektromagnetischer Aktuator, umfassend ein Betätigungselement (6), das mit einer Platte (8) verbunden ist, die unter der Wirkung eines Antriebsorgans beweglich ist, das mindestens eine Spule (1) umfasst, die dazu bestimmt ist, einen magnetischen Fluss in einem Kern (2) zu erzeugen, der eine Fläche hat, die sich gegenüber einer Fläche der Platte (8) erstreckt, wobei mindestens eine der gegenüberliegenden Flächen mindestens einen zurückgesetzten Abschnitt (10; 17; 18) hat, dadurch gekennzeichnet, dass die Platte (8) und der Kern (2) derart ausgebildet sind, dass sie in einem ersten Bereich (12) der Platte (8) und des Kerns (2), der den zurückgesetzten Abschnitt einschließt, einen ersten magnetischen Pfad definieren, der von einem Luftspalt unterbrochen ist, der mindestens gleich dem Rücksprung des zurückgesetzten Abschnittes (10; 17;. 18) ist, wenn die Platte (8) an dem Kern (2) anliegt, und in einem zweiten Bereich (13) der Platte (8) und des Kerns (2), der den zurückgesetzten Abschnitt nicht einschließt, einen zweiten magnetischen Pfad definieren, der nur von einem Restluftspalt unterbrochen ist, wenn die Platte (8) an dem Kern (2) anliegt, wobei der zurückgesetzte Abschnitt einen Gesamtflächeninhalt umfasst, der mindestens gleich einem Flächeninhalt ist, der den magnetischen Fluss in dem zweiten Bereich der Platte zur Sättigung bringt.
  2. Elektromagnetischer Aktuator nach Anspruch 1, dadurch gekennzeichnet, dass der zurückgesetzte Abschnitt einen Gesamtflächeninhalt von unter 50% des Gesamtflächeninhalts der gegenüberliegenden Flächen hat.
  3. Elektromagnetischer Aktuator nach Anspruch 1, dadurch gekennzeichnet, dass der Kern (2) einen zentralen Schenkel (3) und zwei seitliche Schenkel (4) umfasst, deren Enden die Fläche (7) des Kerns (2) definieren, und dass sich der zurückgesetzte Abschnitt (10; 17; 18) auf der mindestens einem der Schenkel des Kerns gegenüberliegenden Fläche der Platte (9) erstreckt.
  4. Elektromagnetischer Aktuator nach Anspruch 3, dadurch gekennzeichnet, dass die Platte (8) zurückgesetzte Abschnitte (10) umfasst, die sich gegenüber den seitlichen Schenkeln (4) des Kerns erstrecken.
  5. Elektromagnetischer Aktuator nach Anspruch 3, dadurch gekennzeichnet, dass die zurückgesetzten Abschnitte in Bezug auf das Betätigungselement symmetrisch angeordnet sind.
  6. Elektromagnetischer Aktuator nach Anspruch 3, dadurch gekennzeichnet, dass der zurückgesetzte Abschnitt (10) transversal über den gegenüberliegenden Schenkel um eine Distanz (1) hinausgeht, die mindestens gleich dem Rücksprung (r) des zurückgesetzten Abschnittes (10) in Bezug auf das Betätigungselement ist.
  7. Elektromagnetischer Aktuator nach Anspruch 3, dadurch gekennzeichnet, dass sich der zurückgesetzte Abschnitt (17, 18) transversal zu den drei Schenkeln (4, 3, 4) gegenüber jedem dieser erstreckt.
  8. Elektromagnetischer Aktuator nach Anspruch 7, dadurch gekennzeichnet, dass der zurückgesetzte Abschnitt (17) die Form einer Schrägkante hat.
  9. Elektromagnetischer Aktuator nach Anspruch 1, dadurch gekennzeichnet, dass der erste Bereich (12) und der zweite Bereich (13) des Kerns (2) magnetisch isoliert sind.
  10. Elektromagnetischer Aktuator nach Anspruch 9, dadurch gekennzeichnet, dass der Kern aus einem Blechpaket gebildet ist, wobei mindestens eine magnetische Barriere (16) in das Blechpaket eingefügt ist, um die Bleche, die den ersten Bereich (12) und den zweiten Bereich (13) des Kerns (2) bilden, voneinander zu trennen.
EP03720653A 2002-03-01 2003-02-28 Elektromagnetischer aktuator mit kontrollierter anziehungskraft Expired - Lifetime EP1481406B1 (de)

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 EP1481406A1 (de) 2004-12-01
EP1481406B1 true EP1481406B1 (de) 2007-11-28

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EP03720653A Expired - Lifetime EP1481406B1 (de) 2002-03-01 2003-02-28 Elektromagnetischer aktuator mit kontrollierter anziehungskraft

Country Status (8)

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US (1) US7042321B2 (de)
EP (1) EP1481406B1 (de)
JP (1) JP4473582B2 (de)
AU (1) AU2003224230A1 (de)
DE (1) DE60317777T2 (de)
ES (1) ES2299696T3 (de)
FR (1) FR2836755B1 (de)
WO (1) WO2003075293A1 (de)

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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
RU2393566C1 (ru) * 2009-02-24 2010-06-27 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" - Корпорация Многополюсная магнитная система
DE102013220853A1 (de) * 2013-10-15 2015-04-16 Continental Automotive Gmbh Verfahren zum Ansteuern einer elektromagnetischen Stellvorrichtung mit einer Spule
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
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
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

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Also Published As

Publication number Publication date
AU2003224230A1 (en) 2003-09-16
EP1481406A1 (de) 2004-12-01
US7042321B2 (en) 2006-05-09
DE60317777D1 (de) 2008-01-10
ES2299696T3 (es) 2008-06-01
WO2003075293A1 (fr) 2003-09-12
FR2836755A1 (fr) 2003-09-05
DE60317777T2 (de) 2008-11-20
FR2836755B1 (fr) 2004-08-20
JP4473582B2 (ja) 2010-06-02
JP2005519465A (ja) 2005-06-30
US20050083159A1 (en) 2005-04-21

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