WO2010072908A1 - Electromagnetic actuator with dual control circuits - Google Patents
Electromagnetic actuator with dual control circuits Download PDFInfo
- Publication number
- WO2010072908A1 WO2010072908A1 PCT/FR2009/001399 FR2009001399W WO2010072908A1 WO 2010072908 A1 WO2010072908 A1 WO 2010072908A1 FR 2009001399 W FR2009001399 W FR 2009001399W WO 2010072908 A1 WO2010072908 A1 WO 2010072908A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- arms
- moving
- winding
- magnetic
- movable
- Prior art date
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
- H01F7/13—Electromagnets; Actuators including electromagnets with armatures characterised by pulling-force characteristics
-
- 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
-
- 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
- H01F2007/1669—Armatures actuated by current pulse, e.g. bistable actuators
-
- 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
- H01F7/14—Pivoting armatures
-
- 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
- H01F7/1607—Armatures entering the winding
- H01F7/1615—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
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1638—Armatures not entering the winding
- H01F7/1646—Armatures or stationary parts of magnetic circuit having permanent magnet
Definitions
- the invention relates to an electromagnetic actuator comprising a first magnetic circuit comprising a first movable armature moving relative to a first magnetic yoke. Said first armature, movable between a first and a second position is separated from the first magnetic yoke by at least one axial gap.
- the first magnetic circuit includes a first coil for generating a control magnetic flux to move the first movable armature from the first to the second position.
- the first magnetic circuit includes a second coil for generating a control magnetic flux to move the first movable armature from the second to the first position.
- a permanent magnet with radial magnetization generates a polarization flux opposing the magnetic flux generated by the first and second coils.
- the electromagnetic actuators generally comprise a movable part such as a sliding actuating rod, at least one inductive winding exerting a force which displaces the mobile part, an electromagnetic carcass surrounding the winding, but through which the rod passes, where the lines close. magnetic fields.
- bistable function of the electromagnetic actuators is also known.
- Bistable electromagnetic actuators also commonly called hybrid actuators further comprise at least one permanent magnet to maintain the movable part in at least one stable position.
- the electromagnetic bistable actuators thus comprise a locking function of the mobile part by closing a variable air gap polarized by the permanent magnet and a motorization function allowing the unlocking and then the tilting of the moving part in another stable position.
- the particular electromagnetic actuator bistable results from a compromise between the two antinomic functions it must achieve: a locking function and a motorization function of the movable part.
- a poor locking is observed, if the mobile air gap is deformed according to its section, and / or a derisory motor efficiency, if the mobile air gap deforms according to its fiber. This compromise results from the general properties of the non-polarized reluctant circuits.
- the setting in motion of the movable part is accompanied by an increase of the self-inductance of the excitation circuit as seen by the voltage source.
- this increase in the inductance inductance due to the closure of the air gap causes a decrease in the excitation current in the coil during the movement phase and leads to a reduction in the driving force of the electromagnetic actuator.
- the invention therefore aims to overcome the disadvantages of the state of the art, so as to provide an electromagnetic actuator with high energy efficiency.
- the electromagnetic actuator according to the invention comprises a second magnetic circuit magnetically decoupled from said first magnetic circuit and having a second movable armature moving relative to a second magnetic yoke and being separated from said second magnetic yoke by a radial air gap remaining constant during his displacement.
- the two movable armatures are mechanically linked to move simultaneously between the first and the second position.
- a third winding is for producing a control magnetic flux for moving the second movable armature from the first to the second position.
- a fourth coil is adapted to produce a control magnetic flux for moving the second movable armature from the second to the first position.
- the first winding and the third winding are connected in series and are intended to simultaneously produce magnetic control fluxes for moving the first and second movable armatures from the first to the second position
- the second winding and the fourth winding are connected in series and are intended to simultaneously produce magnetic control fluxes for moving the first and second movable armatures from the second to the first position.
- the electromagnetic actuator comprises independent means for supplying the first, second, third and fourth windings, the power supply means being intended to simultaneously control the first winding and the third winding for moving the first and second movable armatures from the first to the second position.
- the power supply means are intended to simultaneously control the second winding and the fourth winding to move the first and second movable armatures from the second to the first position.
- the first magnetic yoke comprises at least first E-shaped portion having two outer arms and an intermediate arm comprising the permanent magnet, each outer arm being connected to the intermediate arm by a first section.
- the first and second coils are respectively positioned on a first section, the first movable armature moving between the outer arms.
- the first magnetic yoke comprises at least one E-shaped portion having two outer arms and an intermediate arm, each outer arm being connected to the intermediate arm by a first section, the third and fourth coils being respectively positioned on a first section.
- the second movable armature moves in front of the free end of said arms and is separated from said ends by the radial sliding air gap.
- the free end of the outer arms comprises a second section perpendicular to said arms, the second movable armature moving parallel to these second sections and being separated from said sections by the radial sliding air gap.
- the first and the second magnetic yokes are facing each other so that the ends of the outer and intermediate arms of the first yoke are placed facing the end of the arms. of the second breech.
- the first magnetic yoke comprises two parts each having an E-shape and being placed facing each other so that free ends of the outer and intermediate arms of the first part are placed vis-à-vis a free end of the arms of the second part.
- Two permanent magnets with magnetization radial are positioned on the intermediate arms.
- the first and second coils are positioned around the first movable armature moving between the outer arms of the two parts.
- the second magnetic yoke comprises two E-shaped portions and being placed facing each other so that free ends of the outer and intermediate arms of the first part are placed opposite a free end of the arms of the second part.
- the third and fourth coils are positioned around the second movable armature moving within the two E-shaped portions and in front of the end of said arms.
- the two movable armatures are connected by a hooking bar whose longitudinal axis coincides with that of the moving armatures, said two movable armatures having a same longitudinal axis corresponding to the axis of displacement of said armatures.
- the first magnetic yoke has a curved E-shape having two outer arms and an intermediate arm, each outer arm being connected to the intermediate arm by a section developing in a first arc.
- the first movable armature moves between the outer arms in a circular motion.
- the second magnetic yoke has a curved E shape having two outer arms and an intermediate arm, each outer arm being connected to the intermediate arm by a section developing along a second arc.
- the second movable armature moves in front of the end of said arms in a circular motion.
- the two movable armatures are mechanically linked by a snap bar.
- FIG. 1 represents a block diagram of a first preferred embodiment of an electromagnetic actuator in a first operating position
- FIGS 2 and 3 show schematic diagrams of an electromagnetic actuator according to Figure 1 in intermediate positions
- FIG. 4 represents a schematic diagram of the electromagnetic actuator in a second operating position according to FIG. 1;
- FIG. 5 represents a diagram of the control circuit of the electromagnetic actuator according to a first particular embodiment
- FIG. 6 represents a diagram of the control circuit of the electromagnetic actuator according to a second particular embodiment
- FIG. 7 represents a curve of the intensity of the electric current flowing in the coil of the electromagnetic actuator according to FIG. 1;
- FIG. 8 represents a block diagram of a first variant embodiment of the electromagnetic actuator according to FIG. 1;
- FIG. 9 represents a schematic diagram of a second variant embodiment of the electromagnetic actuator according to FIG. 1;
- FIG. 10 represents a schematic diagram of another variant embodiment of the electromagnetic actuator according to FIG. 1;
- Figure 11 shows a block diagram of a second preferred embodiment of an electromagnetic actuator in a first operating position
- Figure 12 shows a block diagram of a third preferred embodiment of an electromagnetic actuator in a first operating position.
- the electromagnetic actuator comprises a first magnetic circuit 1 having a first movable armature 10 moving relative to a first magnetic yoke 11.
- the first deformable magnetic circuit 1 has a variable axial air gap.
- Said first movable armature 10 between a first and a second position is separated from the first magnetic yoke 11 by at least one axial gap e1, e2.
- Said first movable armature 10 moves between an open position K1 and a closed position K2.
- the closed position K2 as shown in FIG. 4 usually corresponds to at least a first air gap e1 existing between the moving armature 12 and the fixed yoke 11.
- a second air gap e2 between mobile armature 12 and the fixed yoke 11 is then maximum.
- the closed position K1 as shown in Figure 1 usually corresponds to the maximum of the first gap e1.
- the second air gap e2 is then minimum.
- the first magnetic circuit 1 of the electromagnetic actuator comprises a first winding 12A for generating a control magnetic flux ⁇ 12A for moving the first movable armature 10 of the first K1 to the second position K2.
- the first magnetic circuit 1 comprises a second winding 12B for producing a control magnetic flux ⁇ 12B for moving the first movable armature 10 of the second K2 to the first position K1.
- the first magnetic yoke 11 comprises at least one permanent magnet 16 with radial magnetization. Said at least one permanent magnet 16 generates a polarization flux ⁇ U which opposes the magnetic flux generated by the first and second coils 12A, 12B.
- the electromagnetic actuator is a bistable actuator with magnetic latching.
- the electromagnetic actuator further comprises a second circuit magnet 2 decoupled magnetically from said first magnetic circuit.
- Magnetic decoupling between the first and the second magnetic circuits 1, 2 means that the coefficient of mutual induction between the two circuits is substantially equal to zero. This decoupling can be achieved by a magnetic shielding, not shown.
- the second magnetic circuit 2 comprises a second movable armature 20 moving relative to a second magnetic yoke 21.
- the second movable armature 20 is separated from the second magnetic yoke 21 by a sliding air gap e3.
- the sliding air gap e3 is constant in a radial direction perpendicular to that of the displacement of said movable armature.
- the two movable armatures 10, 20 are mechanically linked to move simultaneously between the first and the second position.
- the second magnetic circuit 2 of the electromagnetic actuator comprises a third winding 22A for producing a control magnetic flux for moving the second movable armature 20 from the first K1 to the second K2 position.
- the second magnetic circuit 2 includes a fourth winding 22B for producing a control magnetic flux for moving the second movable armature 20 from the second K2 to the second first K1.
- the first inductor L1 of the first magnetic circuit 1 is proportional to the ratio between the number of turns N squared and the reluctance of the circuit. Said first inductance L1 can be expressed with the following equation (2):
- the inductance L1 of the first magnetic circuit is inversely proportional to the displacement y.
- Said first inductance L1 can be expressed with the following equation (4):
- the second inductor L2 of the second magnetic circuit 2 is proportional to the ratio between the number of turns N squared and the reluctance of the circuit. Said second inductance L2 can be expressed with the following equation (5):
- the reluctance R2 of the second magnetic circuit 2 is proportional to the ratio between the gap e3 and the displacement y. Said gap e3 is constant throughout the movement. Said reluctance can be expressed with the following equation (6):
- the gap opening e2 causes an inductance reduction L1 of the first circuit magnetic (equation 4).
- the inductance L2 of the second magnetic circuit tends to increase (equation 7).
- a first curve TA representative of the excitation current in a known actuator and a second curve TB representative of the excitation current in the actuator according to the invention are much lower than that of the first curve TA.
- the initiation of the displacement of the moving part of the actuator is done more quickly with an actuator according to the invention (ta> tb). In other words, this means that the device according to the invention allows a better use of the excitation current that is used to move the moving part while compared to the same time, the current in a known device is used to oppose the flow polarization of the gap by the magnet.
- the first winding 12A and the third winding 12A are connected in series.
- the two coils 12A, 22A are then intended to simultaneously produce magnetic control fluxes.
- the second coil 12B and the fourth coil 22B are connected in series.
- the two coils are then intended to simultaneously produce control magnetic flux ⁇ 12B, ⁇ 22B.
- Switching means 201 allow the alternating connection of the power supply means 200A on the one hand to the first winding 12A and the third winding 22A and secondly to the second winding 12B and the fourth winding 22B.
- the electromagnetic actuator comprises independent means
- 200B supply are intended to simultaneously control the first winding 12A and the third winding 22A to move the first and second armatures 10, 20 of the first K1 to the second position K2.
- the independent power supply means 200B are intended for simultaneously controlling the second winding 12B and the fourth winding 22B to move the first and second armatures 10, 20 of the second K2 to the first position K1.
- the first magnetic yoke 11 is E-shaped having two outer arms 13A, 13B and an intermediate arm 14. Said intermediate arm is substantially parallel to the two outer arms 13A, 13B. Each outer arm 13A, 13B has a first end connected to a first end of the intermediate arm 14 by a first section 15A, 15B. Said first sections 15A, 15B are substantially perpendicular to the outer arms 13A, 13B and intermediate 14. The first winding 12A and the second winding 12B are respectively positioned on a first section 15A, 15B.
- the first movable armature 10 moves between the outer arms 13A, 13B, substantially perpendicular to said outer arms.
- the first movable armature 10 is mounted to slide axially and moves along a longitudinal axis Y of displacement.
- the permanent magnet 16 with radial magnetization perpendicular to the longitudinal axis Y of displacement is then positioned on the intermediate arm 14.
- the second magnetic yoke 21 is also E-shaped having two outer arms 23A, 23B and an intermediate arm 24. Said intermediate arm is substantially parallel to the two outer arms 23A, 23B.
- 23A, 23B has a first end connected to a first end of the intermediate arm 24 by a first section 25A, 25B.
- the second movable armature 20 moves in front of a second free end of said arms.
- the second movable armature 20 is mounted to slide axially and moves along a longitudinal axis Y of displacement.
- the second movable armature 20 is separated from the second free end of the outer and intermediate arms 13A, 13B, 14 by the sliding air gap e3.
- the sliding air gap e3 is constant in a radial direction perpendicular to the longitudinal axis Y of displacement.
- the longitudinal axis of the second magnetic yoke 21 is common with the longitudinal axis of the first fixed magnetic yoke 11.
- the first and second magnetic yokes 11, 21 are positioned face to face so that the free ends of the outer arms 13A, 13B and intermediate 14 of the first yoke 11 are placed opposite the free end of the arms 23A, 23B, 24 of the second cylinder head 21.
- the two mobile armatures 10, 20 are mechanically connected by a hooking bar 17.
- the second end of the outer arms 23A, 23B may comprise a second section 18A, 18B perpendicular to said arms.
- the second movable armature 20 moves parallel to these second sections 18A, 18B and is separated from said sections by the radial air gap e3.
- This variant embodiment maximizes the surface of the sliding air gap e3.
- the magnetic yokes 11, 21 of the two magnetic circuits are of different size.
- the first and the second magnetic yokes are positioned opposite each other, but the free ends of the outer arms of the first yoke 11 are not placed opposite the free end of the arms of the second The yoke 21.
- the movable armature 20 of the second yoke preferably moves within the magnetic yoke 21.
- the movable armatures of the two magnetic circuits are in direct contact and are no longer linked by a snap bar.
- the electromagnetic actuator is thus more compact.
- the first magnetic yoke 11 is composed of two parts 11 A, 11 B each having an E-shape.
- Each part 11A, 11B has two arms outside and an intermediate arm.
- the intermediate arm is substantially parallel to the two outer arms.
- Each outer arm has a first end connected to a first end of the arm intermediate by a section. Said sections are substantially perpendicular to the outer and intermediate arms.
- the two parts are placed vis-à-vis so that second free ends of the outer and intermediate arms of the first part are placed opposite the free end of the arms of the second part.
- Two permanent magnets 16 with radial magnetization perpendicular to the longitudinal axis Y are then positioned on the intermediate arms.
- the first and second coils 12A, 12B are respectively positioned around the first movable armature 10.
- the first movable armature moves between the outer arms the two E-shaped portions.
- the first movable armature 10 moves substantially perpendicular to said outer arms.
- the second magnetic yoke 21 is also composed of two portions 21A, 21B each having an E-shape. Each part has two outer arms and an intermediate arm. Said intermediate arm is substantially parallel to the two outer arms. Each outer arm has a first end connected to a first end of the intermediate arm by a section. Said sections are substantially perpendicular to the outer and intermediate arms.
- the two parts of the second magnetic yoke are placed facing each other so that second free ends of the outer and intermediate arms of the first part are placed opposite a second free end arms of the second part.
- the third and fourth coils are respectively positioned around the second movable armature moving inside the two E-shaped portions and in front of the second ends of said arms.
- the two mobile armatures 10, 20 preferably have the same longitudinal axis corresponding to the longitudinal axis Y of displacement of said armatures 10, 20.
- the two armatures 10, 20 are interconnected by a hooking bar whose longitudinal axis is preferably confused with that of the movable armatures.
- the first magnetic yoke 11 has an E shape. curved having two outer arms 13A, 13B and an intermediate arm 14. Each outer arm 13A, 13B is connected to the intermediate arm 14 by a section 15A, 15B. Said section develops in a first arc of circle, first arc having a first radius R1.
- the first and second coils 12A, 12B are respectively positioned on first and second curved sections 15A, 15B.
- the first movable armature 10 moves between the outer arms 13A, 13B in a circular motion.
- the center of rotation O around which the moving armature 10 rotates is preferably coincident with the center of the first arc.
- a permanent magnet 16 with radial magnetization perpendicular to the longitudinal axis Y of displacement is then positioned on the intermediate arm 14.
- the second magnetic yoke 21 also has a curved E shape having two outer arms 23A, 23B and an intermediate arm 24. Each outer arm 23A, 23B has a first end connected to the intermediate arm 24 by a first section 25A, 25B. Said sections develop in a second circular arc, said second arc having a second radius R2.
- the third and fourth 22A, 22B of the second coil 22 are respectively positioned on a first curved section 25A, 25B.
- the center of rotation O around which the second movable armature 20 rotates coincides with the center of the second arc.
- the second movable armature 20 is separated from the free end of the horizontal outer arms 13A, 13B by the sliding air gap e3. During the displacement of the second moving armature 20, the sliding air gap e3 is constant in a radial direction.
- the two mobile armatures 10, 20 are mechanically linked by a latching bar 17. The centers of rotation O of the movable armatures 10, 20 are merged.
- the second mobile armature 20 preferably moves in front of the second end of said arms in a circular motion.
- the displacement of said second armature is made in a plane preferably coinciding with that of second magnetic yoke 21.
- the second movable armature preferably moves above or below said arms in a circular motion.
- the displacement of the second mobile armature is realized in a plane parallel to that of the second magnetic yoke.
- the sliding air gap e3 then corresponds to a substantially constant distance between the plane of the second magnetic yoke 21 and that in which the second movable armature rotates.
- the second movable armature comprises a first and second parts interconnected and arranged on either side of the second magnetic yoke.
- the first part is intended to move above the second magnetic yoke and the second part is intended to move below said second yoke.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2009332810A AU2009332810A1 (en) | 2008-12-22 | 2009-12-08 | Electromagnetic actuator with dual control circuits |
CN200980151093.5A CN102257581B (en) | 2008-12-22 | 2009-12-08 | Electromagnetic actuator with dual control circuits |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0807331A FR2940500B1 (en) | 2008-12-22 | 2008-12-22 | ELECTROMAGNETIC ACTUATOR WITH DOUBLE CONTROL CIRCUITS |
FR08/07331 | 2008-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010072908A1 true WO2010072908A1 (en) | 2010-07-01 |
Family
ID=40845906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2009/001399 WO2010072908A1 (en) | 2008-12-22 | 2009-12-08 | Electromagnetic actuator with dual control circuits |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN102257581B (en) |
AU (1) | AU2009332810A1 (en) |
FR (1) | FR2940500B1 (en) |
WO (1) | WO2010072908A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020186358A1 (en) * | 2019-03-20 | 2020-09-24 | The University Of British Columbia | Solenoid apparatus and methods |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011053289A1 (en) * | 2011-09-06 | 2013-03-07 | Contitech Vibration Control Gmbh | actuator |
FR3028662B1 (en) * | 2014-11-14 | 2016-12-16 | Hager-Electro Sas | ELECTROMAGNETIC ACTUATOR WITH MULTIPLE COILS |
FR3053522B1 (en) | 2016-07-01 | 2018-08-17 | Safran Landing Systems | BISTABLE LINEAR ELECTRO-MAGNET |
EP4047250B1 (en) * | 2021-02-22 | 2023-11-29 | Etel S.A. | Magnetic z-actuator and wafer holder comprising such actuator |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1559373A (en) * | 1975-10-13 | 1980-01-16 | Hart J C H | Magnetic actuators for spool and sleeve valves |
WO2001065581A1 (en) * | 2000-03-02 | 2001-09-07 | Cruise, Rupert, John | A magnetic actuator |
WO2003030188A1 (en) * | 2001-09-24 | 2003-04-10 | Abb Patent Gmbh | Electromagnetic actuator |
EP1612812A1 (en) * | 2004-06-29 | 2006-01-04 | Renault SAS | Direct drive linear actuator |
-
2008
- 2008-12-22 FR FR0807331A patent/FR2940500B1/en not_active Expired - Fee Related
-
2009
- 2009-12-08 CN CN200980151093.5A patent/CN102257581B/en not_active Expired - Fee Related
- 2009-12-08 AU AU2009332810A patent/AU2009332810A1/en not_active Abandoned
- 2009-12-08 WO PCT/FR2009/001399 patent/WO2010072908A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1559373A (en) * | 1975-10-13 | 1980-01-16 | Hart J C H | Magnetic actuators for spool and sleeve valves |
WO2001065581A1 (en) * | 2000-03-02 | 2001-09-07 | Cruise, Rupert, John | A magnetic actuator |
WO2003030188A1 (en) * | 2001-09-24 | 2003-04-10 | Abb Patent Gmbh | Electromagnetic actuator |
EP1612812A1 (en) * | 2004-06-29 | 2006-01-04 | Renault SAS | Direct drive linear actuator |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020186358A1 (en) * | 2019-03-20 | 2020-09-24 | The University Of British Columbia | Solenoid apparatus and methods |
US11972899B2 (en) | 2019-03-20 | 2024-04-30 | The University Of British Columbia | Solenoid apparatus and methods |
Also Published As
Publication number | Publication date |
---|---|
CN102257581B (en) | 2013-10-30 |
FR2940500B1 (en) | 2010-12-24 |
CN102257581A (en) | 2011-11-23 |
FR2940500A1 (en) | 2010-06-25 |
AU2009332810A1 (en) | 2011-07-07 |
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