GB2142780A - Bistable electromagnetic actuating device - Google Patents
Bistable electromagnetic actuating device Download PDFInfo
- Publication number
- GB2142780A GB2142780A GB08416379A GB8416379A GB2142780A GB 2142780 A GB2142780 A GB 2142780A GB 08416379 A GB08416379 A GB 08416379A GB 8416379 A GB8416379 A GB 8416379A GB 2142780 A GB2142780 A GB 2142780A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- actuating device
- switching member
- switching
- magnetic
- 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.)
- Withdrawn
Links
- 230000004907 flux Effects 0.000 claims abstract description 22
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 8
- 230000001419 dependent effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
- F16K31/082—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet using a electromagnet and a 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
- H01F7/1607—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
- H01F2007/1684—Armature position measurement using coils
-
- 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
- H01F2007/1692—Electromagnets or actuators with two coils
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
In order to achieve, in the case of a bistable electromagnetic actuating device 2, high effective switching forces and short switching times with a relatively low-power magnet coil and permanent magnet arrangement, the device 2 is provided with two permanent magnets 22, 24 opposingly poled in the switching direction of the magnet armature 32 and which act in each case by way of a magnet gap 50 or 52 respectively, closing in the end position of the magnet armature 8, on the magnet armature, in which respect both magnet gaps 50, 52 are arranged in the magnetic main flux path of the magnet coils 18, 20, so that upon energisation of the corresponding magnet coil the magnetic flux at the opened magnet gap 50 on that part of the permanent magnet 22 lying in the switching direction is increased to the extent that, at the closed magnet gap 52 on the part of the other permanent magnet 24, the permanent magnet field and thus the retaining force opposing the switch-over is reduced to nil. <IMAGE>
Description
SPECIFICATION
Bistable electromagnetic actuating device
This invention relates to bistable electromagnetic acutating devices, more especially for shut-off valves.
Known actuating devices of this kind have, relative to the achievable switching forces or times respectively, a high power requirement and need relatively strong electro-magnet and permanent magnet arrangements. This means that the known devices are only limitedly suitable for instances of use where, besides a minimum peak current consumption, a spacesaving and above all weight-wise light mode of construction is required, for example shutoff valves for vehicles in space travel.
The task of the invention is to improve the known actuating devices to the extent that, related to their effective switching force or speed respectively, a considerable reduction of structural weight and size as well as of the current consumption results.
This task is achieved by the present invention in that there is provided a bistable electromagnetic actuating device, more especially for a shut-off valve, comprising a switching member which can be changed over between its end positions by a magnet coil arrangement of reversible polarity and a permanent magnet arrangement which holds the switching member in the respective end position, characterised in that the permanent magnet arrangement contains two permanent magnets which are spaced apart from one another in the direction of movement of the switching member and which are arranged poled opposingly to one another in the main flux path of the magnetic coil arrangement.
In accordance with the invention, by reason of the special arrangement and mutual alignment of the permanent magnets in the magnet-coil main flux path it is ensured that upon energisation of the magnet coil arrangement the magnetic flux on the part of the permanent magnet lying in each case in the switch-over direction increases to the same extent as the retaining force, opposing the switch-over, of the other permanent magnet is reduced.As a result of this opposingly equal field strength change at the two permanent magnets, precisely also in the initial phase of the switch over procedure which is crucial for the peak current consumption, a quite considerable rise in the switching force acting on the switching member is achieved, so that the actuating device in accordance with the invention satisfies the demands for a bistable switching behaviour with high usable actuating forces and/or switching speeds in an outstanding manner and nevertheless makes do with a very low-power magnet coil and permanent magnet arrangement of low structural volume and weight.
In many instances of use the actuating force which is needed for the switch-over of the mechanism connected subsequently to the actuating device is dependent on the switching direction, for instance when the actuating device is used for a shut-off valve which is locked hydraulically in the closure position it needs a higher actuating force for the opening than for the closing. In this case the two permanent magnets have, in a particularly preferred aspect of the present invention, retaining forces of different magnitudes, in such a way that the permanent magnet which holds the switching member in that end position out of which a switch over has to be effected with the higher actuating force.In other words in the case of a shut-off valve locked hydraulically in the closure position the closure position permanent magnet has the greater field intensity and/or as a result of appropriate dimensioning of the magnetic conductivity, has a stronger magnetic flux than the oppositely-acting permanent magnet.Because, in the case of the actuating device in accordance with the invention, by reason of the special magnetic flux control by energisation of the magnet coil arrangement the magnetic flux, acting in each case in the switching direction, on the part of the one permanent magnet increases simultaneously and to the same extent as the opposing magnetic field, holding the switching member in the respective end position, of the other permanent magnet is caused to disappear, such a one-sidedly higher design of one of the permanent magnets brings about a corresponding growth in switching force in the direction of the end position opposite to this permanent magnet.
Therefore, there is achieved in an extremely simple way and along with further reduction in the electrical power requirement an asymmetrical switching-force control adapted to the respective instance of use. In other words in the case of the said shut-off valve by a stronger design of the closure-position permanent magnet the switching force effective upon the opening of the valve is increased unilaterally or one-sidedly.
A further material aspect of the present invention consists is that the switching member advantageously consists in two-part manner of a magnet armature and an actuating element which is connected resiliently to the magnetic armature in the direction of movement of the switching member and which brings about the switch-over of the mechanism which is connected subsequently to the actuating device, in other words more especially of the said shut-off valve.This limitedly resilient (spurious) coupling is based on the reflection that the magnetic force acting in the switching direction with increasing proximity of the switching member to the new end position automatically, i.e. without increase of the circulation of the magnet coil arrange ment, grows exponentially and the otherwise customary power requirement peaks which are needed by the actuating device upon rigid coupling-up to the subsequently-connected mechanism (shut-off valve) can be reduced to a considerable extent in that the actuating device - precisely by reason of the limited idle stroke present in the switching member in the initial phase of the switch-over procedure remains relieved of the actuating force for the subsequently-connected mechanism until the switching-effective magnetic force also without an increase in the current consumption of the magnet-coil arrangement has reached a threshold value - predetermined by the movement play in the switching member. This leads to a further quite considerable improvement with respect to power consumption as well as to the structural size and weight of the actuating device, more especially in those cases where a strong actuating force has to be applied, for the subsequently-arranged (subordinated) mechanism, for instance where a hydraulically locked shut-off valve has to be actuated.
In accordance with a further aspect of the present invention, the permanent magnets are preferably fastened to the ends of the magnet coil arrangement and are sealed off hermetically jointly with this towards the switching member, which offers a very favourable arrangement and, if the switching member operates in aggressive media, above all also a reliable protection of the permanent magnets and magnet coils.
The invention will be described further, by way of example, with reference to the accompanying drawing, in which:
Figure 1 is a schematic sectional elevation of a preferred embodiment of the actuating mechanism with a subsequently arranged shut-off valve; and
Figure 2 is a highly schematised magnetic flux diagram of the magnetic coil and permanent magnet arrangement of the preferred mechanism of Fig. 1.
As illustrated in Fig. 1 the preferred actuating device 2 and a shut-off valve 4 which the device 2 actuates are accommodated jointly in a multi-part, partially bolted, partially welded housing 6 of high magnetic conductivity. The actuating device 2 comprises, as main constituent parts, a switching member 8 which is guided displaceably in a cylindrical housing bush 10 between end positions defined by housing-fast stop surfaces 1 2 or 14 respectively, an annular magnet coil arrangement 1 6 of reversible polarity with an outer magnet coil 1 8 which is energised for the switch-over of the switching member 8 into the lower end position corresponding to the valve closure position, and an inner magnet coil 20 which switches the switching member 8 over into the valve opening position.The device 2 further comprises two annular permanent magnets 22, 24 which are arranged opposingly poled in the direction of movement of the switching member 8 and which are fastened to the ends of the magnet coil arrangement 1 6 at the level of the stop surfaces 1 2 or 14 respectively.
Towards the switching member 8 the permanent magnets 22 and 24 are masked on their inside in each case by a magnetically conductive bush portion 26 or 28 which is connected to the housing parts carrying the stop surfaces 1 2 or 14 respectively, whilst the middle part 30, lying therebetween, of the housing bush 10 consists of a material of low magnetic conductivity. Instead of this, however, there may be a free annular gap between the bush portions 26 and 28.
The switching member 8 consists of a magnet armature which is guided so as to be axially displaceable in the housing bush 10, and an actuating element 36 which is coupled in a limitedly moveable manner with this in the axial direction along with interpolation of a compression spring 34 and which forms the valve tappet of the shut-off valve 4 and carries at its lower end an elastomeric seal 40 which co-operates with valve seat 38. A pressuremedium channel 44 extending from an intake chamber 42 by way of the actuating element 36 to the upper side of the magnet armature 32 serves for the hydaulic locking of the valve 4 in the closure position, out of which the actuating element 36 is moved by the magnet armature 32 only when this has removed itself from its lower end position by the movement play 46 present between the magnet armature 32 and the actuating element 36.
The retaining force opposing, by reason of the hydraulic locking, a switch-over of the valve 4 must consequently first be overcome after run-through of a predetermined end-position idle stroke of the magnet armature 32, so that the actuating device 2 is relieved in the initial phase of the switch-over procedure until the magnetic force acting on the magnet armature 32 in the switching direction has reached a threshold value which is dependent upon the magnitude of the permitted movement play 46.
In order to avoid excessive magnetic adhesion of the magnet armature 32 in the respective end position against the stop surface 1 2 or 14 respectively, a very thin-walled covering 48 of low magnetic conductivity, for example a chromium covering, can be applied to the end faces of the magnet armature 32, so that a variable magnetic gap 50 or 52 respectively which is provided between the armature end surface and the facing housing surface 12, 14 has a minimum - even if very slight - gap width (of some hundredths of a millimetre), as is indicated in a highly exaggerated manner in
Fig. 1 in the lower magnet armature position for the magnetic gap 52.
To explain the switching behaviour of the actuating mechanism reference is made to
Fig. 2, in which the inner magnetic field loops of the axially oppositely polarised permanent magnets 22 and 24 is shown in a highly schematised manner in continuous lines and the main flux path of the magnet coils 1 8, 20 is shown in broken lines. So long as no coil current flows in the lower end position of the magnet armature 32, the magnetic flux and consequently the force of attraction is greatest at the magnetic gap 52 which has the minimum gap width (almost nil). Thus the magnet armature 32 remains locked in this end position by the magnetic flux of the permanent magnet 24.The magnetic main flux path which arises upon the passage of current through the magnet coil 20 and which permeates the magnet armature 32 in the axial direction is at the gap 50 equidirectional with the magnetic flux of the permanent magnet 22, but at the gap 52 is opposed to the magnetic flux of the permanent magnet 24, as is indicated by the direction arrows in Fig.
2. Therefore, upon energisation of the coil 20 the overall magentic flux at the gap 52 is caused to disappear, whilst at the same time the magnetic flux at the gap 50 increases. If the force of attraction at the gap 50 becomes sufficiently great, the magnet armature 32 initially runs through the idle stroke path which is predetermined by the movement play 46 and along which the force of attraction at the gap 50 rises exponentially as a result of the reducing gap width, and then entrains the actuating element 36, along with overcoming the hydraulic locking force, into the upper end position, so that the valve 4 is fully opened.
Since now the gap width at the upper magnet gap 50 is reduced to almost nil, the magnet coil 20 can be switched off and the magnet armature 32 remains held in the upper end position. In a corresponding manner the valve 4 is switched over by a current pulse onto the magnet coil 1 8 into the closure position.
A one-sidedly asymmetric switching force control which is dependent on the switching direction, in such a way that the usable actuating force of the switching member 8 upon the opening of the valve 4 in view of the hydraulic closure-position locking then to be overcome lies higher than upon the closure, is achieved in that the closure-position permanent magnet 24 is designed for a higher magnetic retaining force than the permanent magnet 22, for which either the magnetic field intensity or - as shown - the magnetic flux on the part of the permanent magnet 24 is, with the aid of an additional ring disc 54 of high magnetic conductivity, dimensioned so as to be one-sidedly higher.Therefore, by reason of the above-explained effective connection, in the lower end position the magnetic flux, rising upon energisation of the coil 20 up to the disappearance of the retaining force of the permanent magnet 24, reaches in the region of the magnet gap 50, crucial for the force of attraction acting in the opening direction, a higher value than conversely the magnetic flux induced in the upper end position of the coil 1 8 at the then fully opened magnet gap 52, i.e. the switching force effectively active at the switching member 8 upon energisation of the magnet coil arrangement 1 6 is in the opening direction one-sidedly higher than in the closure direction.
For protection against aggressive media which pass by way of the shut-off valve 4 into the switching chamber of the switching member 8, the magnet coil and permanent magnet arrangement 16, 22, 24 is hermetically sealed, for instance by a casting composition towards the switching chamber as is indicated in Fig. 1 by the dot-dash lines.
Claims (7)
1. A bistable electromagnetic actuating device, more especially for a shut-off valve, comprising a switching member which can be changed over between its end positions by a magnet coil arrangement of reversible polarity and a permanent magnet arrangement which holds the switching member in the respective end position, characterised in that the permanent magnet arrangement contains two permanent magnets which are spaced apart from one another in the direction of movement of the switching member and which are arranged poled opposingly to one another in the main flux path of the magnetic coil arrangement.
2. An actuating device as claimed in claim 1, characterised in that the two permanent magnets have retaining forces of different magnitude.
3. An actuating device as claimed in claim 2 characterised in that the permanent magnets have different field intensities.
4. An actuating device as claimed in claim 2 or 3, characterised in that the magnetic flux of the permanent magnets is dimensioned of different magnitude by variable adjustment of the magnetic conductivity.
5. An actuating device as claimed in any one of the preceding claims, characterised in that the switching member is in two-parts namely a magnet armature and an actuating element which is connected to the magnetic armature so as to be limitedly movable in the switching direction.
6. An actuating device as claimed in any one of the preceding claims, characterised in that the permanent magnets are fastened to the ends of the magnet coil arrangement and are hermetically sealed jointly with this towards the switching member.
7. A bistable electromagnetic actuating device substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833323982 DE3323982A1 (en) | 1983-07-02 | 1983-07-02 | BISTABLE, ELECTROMAGNETIC ACTUATOR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8416379D0 GB8416379D0 (en) | 1984-08-01 |
| GB2142780A true GB2142780A (en) | 1985-01-23 |
Family
ID=6203056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08416379A Withdrawn GB2142780A (en) | 1983-07-02 | 1984-06-27 | Bistable electromagnetic actuating device |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3323982A1 (en) |
| FR (1) | FR2548438A1 (en) |
| GB (1) | GB2142780A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8900779U1 (en) * | 1989-01-25 | 1989-05-11 | Walloschke, Rudolf, 4972 Loehne | Impulse lifting magnet |
| EP0465120A1 (en) * | 1990-06-29 | 1992-01-08 | Shima Seiki Mfg., Ltd. | Bistable solenoid and knitting machine using the same |
| GB2271668A (en) * | 1992-05-29 | 1994-04-20 | Westinghouse Electric Corp | Bistable magnetic actuator |
| GB2357375A (en) * | 1999-12-07 | 2001-06-20 | Sheng Chih Sheng | Pulse driven bistable electromagnetic actuator |
| US6402079B1 (en) | 1999-08-14 | 2002-06-11 | W. Schlafhorst Ag & Co. | Winding station of an automatic bobbin winding machine with a wet splicing device |
| EP1507271A3 (en) * | 2003-08-12 | 2005-04-20 | Japan AE Power Systems Corporation | Electromagnetic device |
| EP1876623A1 (en) * | 2006-07-03 | 2008-01-09 | Siemens Aktiengesellschaft | Safety position switch |
| CN102052505A (en) * | 2009-11-07 | 2011-05-11 | 浙江三花制冷集团有限公司 | Bistable electromagnetic valve |
| US9574676B2 (en) | 2015-01-23 | 2017-02-21 | Honeywell International Inc. | High-temperature and high-vibration capable armature assemblies for torque motor valve actuators |
| US9892837B2 (en) | 2015-05-21 | 2018-02-13 | Adicep Technologies, Inc | Energy efficient actuator |
| US10082217B2 (en) | 2016-12-08 | 2018-09-25 | Honeywell International Inc. | High-temperature and high-vibration capable armature assemblies for torque motor valve actuators with increased winding volume |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT397164B (en) * | 1988-12-09 | 1994-02-25 | Avl Verbrennungskraft Messtech | BISTABLE MAGNET |
| US5032812A (en) * | 1990-03-01 | 1991-07-16 | Automatic Switch Company | Solenoid actuator having a magnetic flux sensor |
| DE4103777A1 (en) * | 1991-02-08 | 1992-08-13 | Mueller A & K Gmbh Co Kg | OWN MEDIUM-OPERATED, VALVE CONTROLLED BY A BISTABLE SOLENOID VALVE FOR LIQUID AND GASEOUS MEDIA |
| DE4118213A1 (en) * | 1991-06-04 | 1992-12-10 | Peter Josef Dr Rer Nat Reuters | Flushing appts. for toilets - has flushing valve in water line whose opening time is controlled electronically according to signal from pressure sensor in same water line |
| DE4208366A1 (en) * | 1992-03-16 | 1993-09-23 | Bosch Gmbh Robert | DOUBLE-ACTING ELECTROMAGNETIC LINEAR MOTOR |
| DE102006047440A1 (en) * | 2006-10-07 | 2008-04-10 | Continental Teves Ag & Co. Ohg | Electromagnetic valve e.g. two way seat valve, for slip-regulated motor vehicle brake system, has solenoid coil arranged coaxial to armature, and magnetic coil with wound coil for actuating valve closing unit in intermediate position |
| DE102009021639B4 (en) * | 2009-05-16 | 2011-03-10 | A. u. K. Müller GmbH & Co KG | Solenoid valve for liquid and gaseous media |
| US9328839B2 (en) * | 2014-01-08 | 2016-05-03 | Honeywell International Inc. | High-temperature torque motor actuator |
| CN105889601A (en) * | 2015-01-05 | 2016-08-24 | 桑宇宏 | Powerful high-speed electromagnetic valve |
| DE102019131604A1 (en) * | 2019-11-22 | 2021-05-27 | Induserve B.V. | Electromagnetic valve actuator for non-stop electromagnetic valve, valve and reciprocating internal combustion engine with valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1008735A (en) * | 1961-03-21 | 1965-11-03 | Elliott Brothers London Ltd | Improvements relating to electrical devices for producing a controlled and reversibleforce or movement in a linear direction |
| US4127835A (en) * | 1977-07-06 | 1978-11-28 | Dynex/Rivett Inc. | Electromechanical force motor |
| GB1591471A (en) * | 1977-06-18 | 1981-06-24 | Hart J C H | Electromagnetic actuators |
| EP0033803A2 (en) * | 1980-02-07 | 1981-08-19 | National Aeronautics And Space Administration | Linear magnetic motor |
| GB2111755A (en) * | 1981-11-16 | 1983-07-06 | Moog Inc | Electro-magnetic actuator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7823613U1 (en) * | 1978-08-07 | 1979-11-08 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | ELECTROMAGNET |
| DE3132396C2 (en) * | 1981-08-17 | 1985-11-07 | Schultz, Wolfgang E., Dipl.-Ing., 8940 Memmingen | Electromagnet |
-
1983
- 1983-07-02 DE DE19833323982 patent/DE3323982A1/en not_active Withdrawn
-
1984
- 1984-06-27 GB GB08416379A patent/GB2142780A/en not_active Withdrawn
- 1984-06-29 FR FR8410383A patent/FR2548438A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1008735A (en) * | 1961-03-21 | 1965-11-03 | Elliott Brothers London Ltd | Improvements relating to electrical devices for producing a controlled and reversibleforce or movement in a linear direction |
| GB1591471A (en) * | 1977-06-18 | 1981-06-24 | Hart J C H | Electromagnetic actuators |
| US4127835A (en) * | 1977-07-06 | 1978-11-28 | Dynex/Rivett Inc. | Electromechanical force motor |
| EP0033803A2 (en) * | 1980-02-07 | 1981-08-19 | National Aeronautics And Space Administration | Linear magnetic motor |
| GB2111755A (en) * | 1981-11-16 | 1983-07-06 | Moog Inc | Electro-magnetic actuator |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8900779U1 (en) * | 1989-01-25 | 1989-05-11 | Walloschke, Rudolf, 4972 Loehne | Impulse lifting magnet |
| EP0465120A1 (en) * | 1990-06-29 | 1992-01-08 | Shima Seiki Mfg., Ltd. | Bistable solenoid and knitting machine using the same |
| GB2271668A (en) * | 1992-05-29 | 1994-04-20 | Westinghouse Electric Corp | Bistable magnetic actuator |
| US6402079B1 (en) | 1999-08-14 | 2002-06-11 | W. Schlafhorst Ag & Co. | Winding station of an automatic bobbin winding machine with a wet splicing device |
| GB2357375A (en) * | 1999-12-07 | 2001-06-20 | Sheng Chih Sheng | Pulse driven bistable electromagnetic actuator |
| US7091807B2 (en) | 2003-08-12 | 2006-08-15 | Japan Ae Power Systems Corporation | Electromagnetic device |
| EP1507271A3 (en) * | 2003-08-12 | 2005-04-20 | Japan AE Power Systems Corporation | Electromagnetic device |
| EP1876623A1 (en) * | 2006-07-03 | 2008-01-09 | Siemens Aktiengesellschaft | Safety position switch |
| US7893802B2 (en) | 2006-07-03 | 2011-02-22 | Siemens Aktiengesellschaft | Position switch |
| CN102052505A (en) * | 2009-11-07 | 2011-05-11 | 浙江三花制冷集团有限公司 | Bistable electromagnetic valve |
| US9574676B2 (en) | 2015-01-23 | 2017-02-21 | Honeywell International Inc. | High-temperature and high-vibration capable armature assemblies for torque motor valve actuators |
| US9892837B2 (en) | 2015-05-21 | 2018-02-13 | Adicep Technologies, Inc | Energy efficient actuator |
| US10082217B2 (en) | 2016-12-08 | 2018-09-25 | Honeywell International Inc. | High-temperature and high-vibration capable armature assemblies for torque motor valve actuators with increased winding volume |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2548438A1 (en) | 1985-01-04 |
| GB8416379D0 (en) | 1984-08-01 |
| DE3323982A1 (en) | 1985-01-10 |
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