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US3503022A - Electromagnetic actuators - Google Patents

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Publication number
US3503022A
US3503022A US3503022DA US3503022A US 3503022 A US3503022 A US 3503022A US 3503022D A US3503022D A US 3503022DA US 3503022 A US3503022 A US 3503022A
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Prior art keywords
magnetic
pole
relative
flux
movement
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Expired - Lifetime
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Edward Raymond Burdett
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English Electric Co Ltd
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English Electric Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00Electromagnetic relays
    • H01H51/22Polarised relays
    • H01H51/2209Polarised relays with rectilinearly movable armature
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • H01F7/08Electromagnets; Actuators including electromagnets with armatures
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • H01F7/08Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16Rectilinearly-movable armatures
    • H01F7/1607Armatures entering the winding
    • H01F7/1615Armatures or stationary parts of magnetic circuit having permanent magnet
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/28Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/38Power arrangements internal to the switch for operating the driving mechanism using electromagnet
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66Vacuum switches
    • H01H33/666Operating arrangements
    • H01H33/6662Operating arrangements using bistable electromagnetic actuators, e.g. linear polarised electromagnetic actuators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00Details of electromagnetic relays
    • H01H50/16Magnetic circuit arrangements
    • H01H50/18Movable parts of magnetic circuits, e.g. armature
    • H01H50/20Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • H01F7/08Electromagnets; Actuators including electromagnets with armatures
    • H01F7/121Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/122Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • H01F7/08Electromagnets; Actuators including electromagnets with armatures
    • H01F7/121Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/124Guiding or setting position of armatures, e.g. retaining armatures in their end position by mechanical latch, e.g. detent
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00Electromagnetic relays
    • H01H51/22Polarised relays
    • H01H51/2209Polarised relays with rectilinearly movable armature
    • H01H2051/2218Polarised relays with rectilinearly movable armature having at least one movable permanent magnet

Description

M rch 24, 1970 E. R. BURDETT 3,50

ELECTROMAGNETIC ACTUATORS Filed Sept. 25. 1967 2 Sheets-Sheet l INV'ENTOR Edward Raymond Burdett BY Misegades 80 Douglas ATTORNEYS March 24, 1970 E. R. BURDETT ELECTROMAGNETIC ACTUATORS 2 Sheets-Sheet 2 Ill/fl Filed Sept. 25. 19s? I ////r// Al I Ill/If! FIG. 4e

FIG. 4d

US. Cl. 335256 14 Claims ABSTRACT OF THE DISCLOSURE An electromagnetic actuator includes an armature having a permanent or electromagnet positioned between pole pieces of magnetic steel. The armature is slidably mounted in annular end pole pieces of a housing to limit the movement of the armature between two stable positions. Between the pole pieces of the housing is a tubular yoke supporting flux diverting coils spaced apart longitudinally of the housing. Further flux diverting coils are mounted in annular grooves in the pole pieces of the housing.

The armature is maintained in a selected stable position -by the permanent or electromagnet, the armature being movable between its stable positions by appropriately energising the flux diverting coils.

This invention relates to electromagnetic actuators.

One object of the present invention is to provide an improved electromagnetic actuator.

A further object of the present invention is to provide an electromagnetic actuator which can readily be given a long stroke and is particularly suitable for vacuum interrupters.

Yet another object of the present invention is to provide an electromagnetic actuator which may be operated electrically to move in either direction by appropriate energisation from an electrical supply applied to a pair of terminals.

A fourth object of the present invention is to provide an electromagnetic actuator of which the armature is movable between two stable limiting positions and for which both movement and latching in the limiting positions may be effected by appropriate energisation from an electrical supply applied to a pair of terminals.

In accordance with the invention, an electromagnetic actuator comprises a first magnetic member having first and second spaced magnetic parts, a second magnetic member arranged for relative movement between the magnetic parts and forming With the first magnetic member a main magnetic circuit, the second magnetic member having a first pole for close magnetic association with the first magnetic part at a first stable relative position of the magnetic members and having a second pole for close magnetic association with the second magnetic part at a second stable relative position of magnetic members, the first member carrying a pair of first and second pole pieces spaced apart along the direction of relative movement for magnetic cooperation transversely of the direction of relative movement with a part of the said first pole whereby to provide a local magnetic circuit, magnetomotive force producing means for magnetically holding the members in each stable relative position, when achieved, by creating a flux in the main magnetic circuit, and a flux diverting winding disposed between the first and second pole pieces for creating flux in the local magnetic circuit and energisable when the magnetic members are in a particular one of their stable relative positions for causing relative movement of the magnetic members towards the other stable relative position by etfectively di- United States Patent verting the flux created by the magnetomotive force producing means to pass between the said first pole and the forward one of the first and second pole pieces in a direction having a substantial component longitudinally of the relative movement and of appropriate sense.

One embodiment of the present invention will now be described, by way of example, having reference to the ac companying drawings in which FIGURE 1 is a sectional side elevation of an electromagnetic actuator according to the invention; FIGURE 2 is a sectional end elevation on the line X-X of FIGURE 1; FIGURE 3 is a circuit diagram showing how the flux diverting coils are connected to supply terminals and FIGURE 4 shows a series of diagrams used to explain the operation of the actuator.

The electromagnetic actuator incorporates an armature having a tubular permanent magnet 1 positioned between pole pieces 2 and 3 of magnetic steel. A rod of nonmagnetic steel 4 passes through the pole pieces and carries tubes '5, 6 and 7 also of nonmagnetic steel which allow the magnet and the pole pieces to be clamped together by nuts 8 bearing on respective Washers 9. The tubes 5 and 7 are slidably mounted in bearings 10 and 11 provided in annular end pole pieces 12 and 13 respectively of a housing to limit the movement of the armature. Between the pole pieces 12 and 13 is a tubular yoke 14. The yoke 14 is provided at one end with a pair of spaced apart internal annular poles 23 and 24 with a coil 15 mounted therebetween. -A coil 16 is mounted at the other end of the yoke 14 between a similar pair of internal annular poles 25 and 26. The radial length of the poles 23 to 26 is such that a small air gap is provided between the poles and the pole pieces 2 and 3. Further flux diverting coils 17 and 18 are provided in annular grooves formed in the inner surfaces of pole pieces 12 and 13 respectively.

The movement of the armature is controlled by pulses of direct current passed through the flux diverting coils, the supply circuit for the coils being shown in FIGURE 3. Should all the coils be energised at the same time, the magnet 1 would be demagnetised. In order to prevent this diodes 21 and 22 are provided in the circuits of the coils 17 and 18 respectively so that only one of these coils may be operated at any one time.

When it is required to move the armature to the alternative stable position, a pulse is applied between the terminals 19 and 20, the polarity of the pulse being such that terminal 19 is made positive with respect toterminal 20 to energise the coils 15, 16 and 18. As shown in FIG- URE 4, during the initial movement of the armature (FIGURE 4(b)), the flux paths of coils 16 and 18 are open, the downward movement of the armature being caused by the flux in pole 24 being greater than the flux in pole 23. On the armature reaching the mid-position (FIGURE 4(a) the flux path of the coil 16 is closed, the downward movement of the armature being maintained by the flux in poles '24 and 26 being greater than the flux in poles 23 and 25 respectively. Further downward movement of the armature (FIGURE 4(d)) opens the flux path of coil 15 and closes the flux path of coil 18 to increase the flux in the pole piece 13 and move the armature to its alternative stable position (FIGURE 4(e)). On removing the pulse at terminals .19 and 20 the armature is maintained in position by the magnet.

Should it be required to return the armature to its original position, this may be readily accomplished by applying a pulse to the terminals 19 and 20 so that the terminal 20 is positive with respect to the terminal 19'. In this case the diode 22 is switched off and the coils 15, 16 and 17 only are energised.

Due to the high speed of operation, the armature may bounce before finally coming to rest and it may, therefore, be found necessary to ensure that the length of the 3 pulse applied to the terminals 19 and 20 be sufiiciently long to ensure that the armature is brought to rest in the required position.

It has been found that by employing electromagnetic actuators of the type described above, the distances through which the armature may be moved are somewhat greater than those attainable in previously known electromagnetic actuators. Furthermore, by increasing number of coils and associated poles and by appropriately switching the coils, the distance through which the armature is moved may be still further increased. Also the distance through which the armature is moved may be altered by changing the shape of the pole pieces 2, 3, 12 and 13.

Such an actuator is particularly useful for controlling the operation of electric switches where it has been found that there is a requirement to provide greater separation distances between the fixed and movable contacts and also to increase the length of contact wipe between the fixed and movable contacts.

Various modifications may be made without exceeding the scope of the invention. For example, the permanent magnet 1 may be replaced by an electromagnet. Also the pole pieces could be slotted to reduce eddy current losses which tend to slow down the movement of the armature.

I claim:

1. An electromagnetic actuator comprising a first magnetic member having first and second spaced magnetic parts, a second magnetic member arranged for relative movement between the magnetic parts and forming with the first magnetic member a main magnetic circuit, the second magnetic member having a first pole for close magnetic association with the first magnetic part at a first stable relative position of the magnetic members and having a second pole for close magnetic association with the second magnetic part at a second stable relative position of magnetic members, the first member carying a pair of first and second pole pieces spaced apart along the direction of relative movement for magnetic cooperation transversely of the direction of relative movement with a part of the said first pole whereby to provide a local magnetic circuit, magnetomotive force producing means for magnetically holding the members in each stable relative position, when achieved, by creating a flux in the main magnetic circuit, and a flux diverting winding disposed between the first and second pole pieces for creating flux in the local magnetic circuit and energisable when the magnetic members are in a particular one of their stable relative positions for causing relative movement of the magnetic members towards the other stable relative positionby effectively diverting the flux created by the magnetomotive force producing means to pass between the said first pole and the forward one of the first and second pole pieces in a direction having a substantial component longitudinally of the relative movement and of appropriate sense.

2. An electromagnetic actuator according to claim 1, wherein, in addition to the said pair of first and second pole pieces, the first magnetic member further carries at least one other such pair of pole pieces, and a further said flux diverting winding is .individually provided between the pole pieces of each additional pair, the pairs of pole pieces being each arranged for magnetic cooperation transversely of the direction of relative movement with a part of a said pole of the second magnetic member whereby to provide a respective local magnetic circuit, and each further flux diverting winding being successively active to provide further movement of the magnetic members towardthe second stable relative position as the relative movement establishes each second local magnetic circuit in succession, at each such establishment of a local magnetic circuit the flux generated by the magnetomotive force producing means being efiectively diverted to pass between the appropriate said pole of the second member and the forward one of the respective pair of pole pieces in a direction having a substantial component longitudinally of the relative movement and of appropriate sense.

3. An electromagnetic actuator according to claim 1, wherein, in addition to the pair of first and second pole pieces, the first member has a further pair of third and fourth pole pieces spaced apart along the direction of relative movement for magnetic cooperation transversely of the direction of relative movement with a part of the said second pole whereby to provide a second local magnetic circuit which is established by the said relative movement of the magnetic members in response to the energisation of the said flux diverting winding, and a further flux diverting winding is disposed between the pair of third and fourth pole pieces for creating flux in the second local magnetic circuit and energisable for causing further relative movement of the magnetic members towards the other stable relative position by effectively further diverting the flux created by the'magnetomotive force producing means to pass between the said second pole and the forward one of the third and fourth pole pieces in a direction having a substantial component-longitudinally of the relative movement and of appropriate sense.

4. An electromagnetic actuator according to claim 3, wherein the flux diverting winding and, subsequently, the further fiux diverting winding act to provide relative movement of the members from the first stable relative position towards the second stable relative position.

5. An electromagnetieactuator according to claim 4, wherein the physical relationship of the pair of first and second pole pieces to the said part of the first pole when the magnetic members are in the first stable relative position corresponds to the physical relationship of the pair of third and fourth pole pieces to the said part of the second pole when the magnetic members are in the second stable relative position, the flux diverting coil and the further flux diverting coil being e'nergisable with one polarity to act successively to move the magnetic members from the first stable relative position to the second stable relative position, and likewise being energisable with the opposite polarity to act successively in reverse order to move the magnetic members from the second stable relative position to the. first stable relative position.

6. An electromagnetic actuator according to claim 3, wherein the other one of the third and fourth pole pieces forms part of the main magnetic circuit for the first stable relative position of the magnetic members.

7. An electromagnetic actuator according to claim 5, wherein the other one of the third and fourth pole pieces forms part of the main magnetic circuit for the first stable relative position of the magnetic members and the said forward one of the first and second pole pieces forms part of the main magnetic circuit for the second stable relative position of the magnetic members.

8. An electromagnetic actuator comprising a first magnetic member and a second magnetic member movable relative to one another between two stable relative positions and providing in combination a magnetic circuit, the second member having first and second magnetically opposed poles spaced apart along the direction of relative movement and forming part of the magnetic circuit, and the first magnetic member carrying a pole piece for magnetic cooperation transversely of the direction of relative movement with a part of the said first pole, magnetomotive flux producing means for magnetically holding the members in each stable relative position, when achieved, by creating a flux in the magnetic circuit, and a flux diverting winding magnetically associated with the pole piece and energisable for causing relative movement of the magnetic members by effectively diverting the flux created by the magnetomotive force producing means to pass between the first pole and the'pole piece in a direc tion having a substantial component longitudinally of the relative movement and of appropriate sense.

9. An electromagnetic actuator according to claim 1, which includes a latching winding magnetically associated with each magnetic part of the first magnetic member and energisable for augmenting the action of the magnetomotive force producing means magnetically to hold the members in the respective stable relative position when achieved.

10. An electromagnetic actuator according to claim 1, wherein the magnetomotive force producing means comprises a permanent magnet forming part of the second magnetic member and magnetically disposed between the first and second poles.

11. An electromagnetic actuator comprising:

a magnetic housing having first and second opposed magnetic parts supported in spaced relationship by a hollow magnetic yoke,

a magnetic armature disposed within the housing and forming therewith a main magnetic circuit, the armature being arranged for movement between the magnetic parts and having a first pole for close magnetic association with the first magnetic part of the housing at a first stable position of the armature and having a second pole for close magnetic association with the second magnetic part of the housing at a second stable position of the armature, the housing having a pair of first and second pole pieces spaced apart along the direction of armature movement for magnetic cooperation transversely of the direction of armature movement with a part of the said first pole whereby to provide a first local magnetic circuit and having a further pair of third and fourth pole pieces spaced apart along the direction of armature movement for magnetic cooperation transversely of the direction of armature movement with a part of the said second pole whereby to provide a second local magnetic circuit,

magnetomotive force producing means for magnetically holding the armature in each stable position, when achieved, by creating a flux in the main magnetic circuit, and

first and second flux diverting windings disposed respectively between the first and second pole pieces and the third and fourth pole pieces for creating fiux in the respective local magnetic circuits, the first flux diverting winding being energisable with one polarity when the armature is in its first stable position for causing armature movement towards the second stable position by elfectively diverting the flux created by the magnetomotive force producing means to pass between the first pole and the forward one of the first and second pole pieces in a direction having a substantial component longitudinally of the armature movement and in appropriate sense, and the second flux diverting winding being energisable with one polarity when the movement of the armature in response to the energisation of the. first flux diverting winding has established the second local magnetic circuit for causing further armature movement into its second stable position by effectively further diverting the flux created by the magnetomotive force producing means to pass between the second pole and the forward one of the third and fourth pole pieces'in a direction having a substantial component longitudinally of the armature movement and in appropriate sense, the flux diverting coils being likewise energisable with the opposite polarity to act successively in the reverse order to move the armature from the second to the first stable position, the pole pieces mechanically involved in. causing such armature movement being, in succession, the other ones of the third and fourth pole pieces and the first and second pole pieces.

12. An electromagnetic actuator according to claim 11, which includes a latching winding magnetically associated with each magnetic part of the housing "and energisable for augmenting the action of the magnetomotive force producing means magnetically to hold the armature in the respective stable position when achieved.

13. An electromagnetic actuator according to claim 12, wherein the latching windings are connected in parallel between first and second terminals for supply from a common reversible supply, and a diode gating means is connected in series with each latching winding for preventing energisation of the respective latching winding when the other latching winding is energised to augment the action of the magnetomotive force producing means magnetically to hold the armature in the respective stable position.

14. An electromagnetic actuator according to claim 13, wherein the flux diverting windings are also connected for supply between the first and second terminals.

References Cited UNITED STATES PATENTS 3,202,886 8/1965 Kramer 335-268 XR 3,184,410 5/1965 Flora 335-256 XR 3,148,292 9/1964 Bergslien et a1. 335266 XR 2,915,681 12/1959 'Troy 335229 XR BERNARD A. GILHEANY, Primary Examiner D. M. MORGAN, Assistant Examiner U.S. Cl. X.R. 335-266

US3503022A 1966-09-26 1967-09-25 Electromagnetic actuators Expired - Lifetime US3503022A (en)

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GB4284166A GB1196418A (en) 1966-09-26 1966-09-26 Improvements relating to Electro-Magnetic Devices

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097833A (en) * 1976-02-09 1978-06-27 Ledex, Inc. Electromagnetic actuator
US4282501A (en) * 1979-08-23 1981-08-04 Ledex, Inc. Bi-directional linear actuator
US4422060A (en) * 1981-08-21 1983-12-20 Hitachi Metals, Ltd. D.C. Electromagnetic actuator
DE3400264A1 (en) * 1983-01-07 1984-07-12 Aisin Seiki magnetic device
US4527139A (en) * 1983-06-01 1985-07-02 International Business Machines Corporation Electromagnetic ram actuator
US4597860A (en) * 1984-05-18 1986-07-01 Krupp Polysius Ag Coil arrangement for a magnetic separator having a strong field
US5231747A (en) * 1990-12-21 1993-08-03 The Boeing Company Drill/rivet device
US5263236A (en) * 1990-12-21 1993-11-23 The Boeing Company Drill quill bearing assembly
US5644280A (en) * 1993-12-23 1997-07-01 Perkins Limited Method of operating a two-coil solenoid valve
US6265956B1 (en) 1999-12-22 2001-07-24 Magnet-Schultz Of America, Inc. Permanent magnet latching solenoid
EP1164601A2 (en) * 2000-06-16 2001-12-19 Canon Kabushiki Kaisha Electromagnetic actuator, its manufacturing method, and optical scanner using the same actuator
DE10055078C1 (en) * 2000-11-07 2002-06-20 Bosch Gmbh Robert Linear electrical machine has stator pole coils assigned to single-phase armature winding and field energising winding in alternation
WO2007036722A1 (en) * 2005-09-29 2007-04-05 Schlumberger Holdings Limited Applications of low power bistable actuators downhole
EP1939909A2 (en) 2006-12-28 2008-07-02 Hitachi, Ltd. Circuit breaker and opening and closing method thereof
CN101908420A (en) * 2010-08-31 2010-12-08 无锡市凯旋电机有限公司 Four-coil deblocking bistable state permanent magnet mechanism
US20130207758A1 (en) * 2012-02-10 2013-08-15 GM Global Technology Operations LLC Selectable and controllable detent using spatially modulated magnetic fields
CN104681358A (en) * 2013-11-26 2015-06-03 德昌电机(深圳)有限公司 Electrical contactor and method for controlling time delay closing and opening of contact thereof and for limiting contact vibration and arcing time
US20180017179A1 (en) * 2016-07-15 2018-01-18 Glen A. Robertson Dual acting solenoid valve using bi-stable permanent magnet activation for energy efficiency and power versatility

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GB2125222B (en) * 1982-07-24 1985-12-04 Edward Frederick Birch Electro-magnetic actuator
US4438419A (en) * 1982-07-28 1984-03-20 International Business Machines Corporation Serial ring actuator
GB2125223A (en) * 1982-08-05 1984-02-29 Yeh Chun Tsai Electromagnetic driving device
GB2140214B (en) * 1983-05-13 1987-01-07 Lucas Ind Plc Electromagnetic device
FR2606927B1 (en) * 1986-11-19 1991-09-13 Telemecanique Electrique Bistable polarized electromagnet
EP0280759B1 (en) * 1987-03-06 1993-10-13 Heinrich Dr. Groh Arrangement for electric energy cables for protection against explosions of gas and/or dust/air mixtures, especially for underground working
GB8819166D0 (en) * 1988-08-12 1988-09-14 Ass Elect Ind Magnetic actuator & permanent magnet
GB8905619D0 (en) * 1989-03-03 1989-04-26 Ped Ltd Bistable actuator and fluid control valve incorporating said actuator
GB9012475D0 (en) * 1990-06-05 1990-07-25 P E D Limited Solenoids
DE19649979C1 (en) * 1996-11-22 1998-01-15 Siemens Ag High-voltage switchgear electrodynamic drive system
GB2330012B (en) * 1997-10-04 1999-09-15 Zhang Wei Min Linear motor compressor
JP3953735B2 (en) 1997-10-04 2007-08-08 ズィー・アンド・ディー・リミテッド Linear motor compressor
GB0822760D0 (en) * 2008-12-13 2009-01-21 Camcon Ltd Bistable electromagnetic actuator

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US3148292A (en) * 1959-11-06 1964-09-08 Linear eddy-current electromagnetic actuator
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US3202886A (en) * 1962-01-11 1965-08-24 Bulova Watch Co Inc Bistable solenoid

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US2915681A (en) * 1957-11-20 1959-12-01 Indiana Steel Products Co Magnet assemblies
US3148292A (en) * 1959-11-06 1964-09-08 Linear eddy-current electromagnetic actuator
US3202886A (en) * 1962-01-11 1965-08-24 Bulova Watch Co Inc Bistable solenoid
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Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097833A (en) * 1976-02-09 1978-06-27 Ledex, Inc. Electromagnetic actuator
US4282501A (en) * 1979-08-23 1981-08-04 Ledex, Inc. Bi-directional linear actuator
US4422060A (en) * 1981-08-21 1983-12-20 Hitachi Metals, Ltd. D.C. Electromagnetic actuator
DE3400264A1 (en) * 1983-01-07 1984-07-12 Aisin Seiki magnetic device
US4527139A (en) * 1983-06-01 1985-07-02 International Business Machines Corporation Electromagnetic ram actuator
US4597860A (en) * 1984-05-18 1986-07-01 Krupp Polysius Ag Coil arrangement for a magnetic separator having a strong field
US5685058A (en) * 1990-12-21 1997-11-11 The Boeing Company Method for direct insertion of a headed rivet into a countersunk hole
US5231747A (en) * 1990-12-21 1993-08-03 The Boeing Company Drill/rivet device
US5263236A (en) * 1990-12-21 1993-11-23 The Boeing Company Drill quill bearing assembly
US5404633A (en) * 1990-12-21 1995-04-11 The Boeing Company Method of dynamically supporting a drill quill in a drill/rivet machine
US5621963A (en) * 1990-12-21 1997-04-22 The Boeing Company Differential capacitance in an electromagnetic riveter
US5752306A (en) * 1990-12-21 1998-05-19 The Boeing Company Method for upsetting a headed rivet by differential initiation of opposed electromagnetic rivet drivers
US5577315A (en) * 1990-12-21 1996-11-26 The Boeing Company Method of upsetting rivets
US5644280A (en) * 1993-12-23 1997-07-01 Perkins Limited Method of operating a two-coil solenoid valve
US6265956B1 (en) 1999-12-22 2001-07-24 Magnet-Schultz Of America, Inc. Permanent magnet latching solenoid
EP1164601A2 (en) * 2000-06-16 2001-12-19 Canon Kabushiki Kaisha Electromagnetic actuator, its manufacturing method, and optical scanner using the same actuator
US6920681B2 (en) 2000-06-16 2005-07-26 Canon Kabushiki Kaisha Method of preparing an electromagnetic actuator using a substrate
EP1164601A3 (en) * 2000-06-16 2002-07-24 Canon Kabushiki Kaisha Electromagnetic actuator, its manufacturing method, and optical scanner using the same actuator
US20040056741A1 (en) * 2000-06-16 2004-03-25 Canon Kabushiki Kaisha Electromagnetic actuator, optical scanner and method of preparing electromagnetic actuator
US6674350B2 (en) 2000-06-16 2004-01-06 Canon Kabushiki Kaisha Electromagnetic actuator, optical scanner and method of preparing electromagnetic actuator
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Also Published As

Publication number Publication date Type
GB1196418A (en) 1970-06-24 application
DE1589746A1 (en) 1970-04-30 application

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