GB2259188A - Detecting the operation of an electromagnetic actuator - Google Patents
Detecting the operation of an electromagnetic actuator Download PDFInfo
- Publication number
- GB2259188A GB2259188A GB9218499A GB9218499A GB2259188A GB 2259188 A GB2259188 A GB 2259188A GB 9218499 A GB9218499 A GB 9218499A GB 9218499 A GB9218499 A GB 9218499A GB 2259188 A GB2259188 A GB 2259188A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic
- magnetic flux
- coil
- core
- switching device
- 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- Withdrawn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 51
- 230000005355 Hall effect Effects 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 description 2
- 244000145845 chattering Species 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F7/00—Regulating magnetic variables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
- H01H2047/006—Detecting unwanted movement of contacts and applying pulses to coil for restoring to normal status
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
- H01H2047/046—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current with measuring of the magnetic field, e.g. of the magnetic flux, for the control of coil current
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Magnetically Actuated Valves (AREA)
- Valve Device For Special Equipments (AREA)
- Electromagnets (AREA)
Abstract
The actuator for a valve has an armature 2 which is displaced into a valve closure position when a coil 4 is energised. In order to reduce the electrical power loss and to increase the operational reliability of the actuator a magnetic flux sensor 3 for detecting a variable proportional to the magnetic flux is connected to the core 1. The magnetic flux sensor 3 is connected to an electronic control device 5 in such a manner that the electrical power supplied to the coil 4 can be controlled by the detected variable proportional to the magnetic flux. The sensor may be a Hall effect device or a magnetic field variable resistor connected in a bridge circuit. <IMAGE>
Description
1 ---- Electromagnetically actuated valve 22-391.33 The invention relates
to an electromagnetic switching device for a valve, which device is actuated by means of a coil. Such devices typically comprise a multiple-part, segmentally movable magnetic core provided with a coil.
When an electric voltage is applied to the coil in devices of this kind coupled to a valve, the valve slide or other component coupled to the valve, is actuated and thus the valve is actuated. For example, valve discs are raised from or closed on valve seats. It is also known to detect the position of the valve slide in order to provide information on the state of actuation of the electromagnetic drive or of the valve itself. Many different designs are known for the electromagnetic "switching device" or "switch" of valves of this kind.
Electromagnetic switching devices typically comprise a generally two-part magnetic core provided with a coil. The magnetic core; i.e., the two magnetic core segments, consists of thin individual transformer sheets piled on top of one another to the thickness of the magnetic core. A laminated core of this kind reduces eddy-current losses. When an electric voltage is applied to the coil, the current generates a magnetic field in the magnetic core. This leads to the mutual attraction of the two magnetic core segments and to the formation of a closed magnetic circuit. The magnetic core normally comprises a fixed part carrying the coil and what is referred to as a movable part or movable armature. When using a magnetic system of this kind, the armature is also connectedmany times to switching elements, with the formation of a relay.
An electromagnetic switching device is disclosed in German Patent Specification No. 26 14 926, in which a magnetic core of this kind actuated by a coil is in the form of a hinged armature magnetic core and is used in a switching relay. In this device, there is an air gap between the fixed magnetic core segment and the armature in the non-actuated state. As soon as an electric voltage or an electric current is applied to the coil, the generated magnetic forces close the magnetic circuit, and the armature is attracted to the fixed magnetic core. In order to release the armature from the fixed magnetic core when the voltage or current is disconnected, the armature in this example is connected to an appropriate spring.
The air gap in a magnetic system of the type just described produces high magnetic resistance in the magnetic circuit. A high magnetic voltage must be generated in order to achieve the magnetic force required for movement of the armature. This is achieved by means of a correspondingly high coil current determined by the coil wire resistance. Once the armature has executed its movement towards and into contact with the core, the air gap is closed. The magnetic circuit 1 1 -3resistance in this switched state is very low and the magnetic flux increases accordingly. The strength of the magnetic flux in the switched state is then far in excess of the level required to hold the armature in its closed position. The power thus supplied to the coil leads to undesired heating of the coil if the switched operating state is maintained for a long period of time. Consequently, the power loss of an electromagnetic switching device of this kind is very high. Although this is not important in the case of an individual relay, it increases in the case of a multiple arrangement of switching devices in a larger circuit arrangement.
An electromagnetic switching device is known from German Specification No. 15 40 507, in which an adjustable magnetic shunt is effected by what are referred to as flux concentrating pieces as a function of the path travelled by the armature. The flux concentrating pieces comprise slidably guided slides of non-magnetic material having openings distributed in the longitudinal direction, into which inserts of magnetisable material are introduced. These slides are displaced upon the movement of the magnetic armature In such a manner that the shunt becomes more or less effective according to the switching state. In this manner, the force requirement is adapted as a function of the armature path. In this case, there is no direct reduction of the electrical power supplied to the coil, principally resulting in the same disadvantages found in the prior art described hereinabove. When installing electromagnetic switching devices of this kind; e.g., in -4moving or vibrating parts of a plant, there is a risk that the hinged armature will be raised for a short time as a result of mechanical vibrations and could for example, briefly release a closed electrical contact. In addition, contamination of the surfaces of the magnetic core lying on top of one another after closure of the air gap can result in chattering of the magnetic core segments and thus of the switched over electrical contacts. This can therefore lead to dangerous operating conditions according to the nature of the operating parts switched by devices of this kind. Moreover, a switching device of this kind is extremely ill-suited for use in valve actuation.
The present invention is directed at an electromagnetic switching device for a valve which operates with minimal electrical power loss while also achieving operational reliability with respect to the specific application in the valve or valves with which it is coupled. According to the invention, such a device comprises a magnetic core with an actuating coil and a movable part for connecting to a said valve; a magnetic flux sensor connected to the core for detecting a variable proportional to the magnetic flux in the core, the sensor being connected to an electronic control device such that the electrical power supplied to the coil and thus movement of the movable part is controllable in accordance with the detected variable proportional to the magnetic flux.
1 j1 The invention offers a number of advantages over known valve devices. As the magnetic resistance and thus the magnetic flux in the magnetic circuit are dependent upon the size of the air gap, the latter can be influenced via the magnetic flux sensor by readjustment of the power supplied to the coil. When the magnetic circuit is open; i.e., distanced by the air gap, correspondingly high electrical power is supplied to the coil to close the magnetic circuit. If the magnetic circuit is then closed, the magnetic resistance in the magnetic circuit then falls and the magnetic flux increases accordingly, and this can be recorded by the magnetic flux sensor. When using a Hall-effect element as the magnetic flux sensor, the Hall voltage generated in this manner is a variable proportional to the magnetic flux. This Hall voltage is connected as an input variable to an electronic control device and continuously influences the electrical power or voltage supplied to the coil as a function of the level of the magnetic flux. This means that after closure of the magnetic circuit the electrical power supplied to the coil is reduced in an advantageously simple manner to the level required to keep the magnetic circuit closed. The power loss is thus considerably reduced and the operating temperature of the coil or of the entire electromagnetic switching device is also reduced. Even if the magnetic circuit is subject to chattering for whatever reason, corresponding compensation is effected by this control device, so that the magnetic circuit always remains closed in the actuated state. If the armature is raised unintentionally, the magnetic flux sensor records a drop in the magnetic flux and thus opens the electronic control device in such a manner that the coil is supplied with a higher electric voltage for a short period of time until the armature or the magnetic circuit is closed again. In addition to the reduction of the power loss and the operating temperature, this also leads to increased operational reliability, particularly when using switching elements in moving parts of plants.
In addition to the possibility of using a Hall-effect element as the magnetic flux sensor, it is possible for the magnetic flux sensor to be in the form of a resistance bridge that can be provided with an electrical resistor sensitive to magnetic fields. The resistor sensitive to magnetic fields is directly connected to the magnetic core and is connected via the other resistors not sensitive to magnetic fields to a resistance bridge. When using the resistor, the voltage ratios in the resistance bridge vary as a result ofa variation in the magnetic flux, which can then itself be used as a variable proportional to the magnetic flux at the input of the control device.
In its normal use, an electromagnetic device according to the invention acts as the actuating element of a valve. Actuation of a valve plunger or valve slide is effected via the multiple-part magnetic core. The movable part of the core can be frictionally connected to the valve slide. An electromagnetic element of this kind in a valve can thus 51 C 41 control liquid or gaseous media or hydraulic media. The reliable switched states of the magnetic core also mean, as a result of the frictional connection to the valve slide, that switched states of the valve can be maintained in a safe and reliable manner. However, all embodiments of the invention offer the particular advantage of a reduction of the power used in the switched state.
An operational amplifier is preferred as the electronic control device in switching devices according to the invention. This offers the advantage that the operational amplifier delivers a large variable voltage range at the output, so that it is possible to control coils or electromagnets having different power consumption rates via the same operational amplifier.
The invention will now be described by way of example, and with reference to the accompanying drawing, in which:
Figure 1 shows an electromagnetic switching device with a hinged armature magnetic core; and Figure 2 shows an electromagnetic switching device with a Hall probe in the additional air gap.
Figure 1 shows the arrangement of an electromagnetic switching device comprising a coil and a magnetic core in the form of a hinged armature magnetic core. A magnetic flux sensor 3 is connected to the magnetic core and detects the magnetic flux within the magnetic circuit via a variable proportional to the magnetic flux. The fixed part of the magnetic core consists of a U-shaped magnetic core 1, a hinged armature 2 being hinged on to the open end thereof. In the state shown there, the magnetic circuit is open; i.e., there is an air gap between the hinged armature 2 and the fixed magnetic core 1. The magnetic flux sensor may consist of a Hall-effect element which delivers a Hall voltage proportional to the magnetic flux. A further possible embodiment consists in d--signing the magnetic flux sensor as a resistor sensitive to magnetic fields and connected to a resistance bridge. Both possible embodiments essentially record the magnetic leakage flux around the magnetic core and are arranged externally on the magnetic core. A further possible embodiment using a Hall-effect element is described hereinbelow with reference to Figure 2. The variable proportional to the magnetic flux delivered by the magnetic flux sensor 3 is supplied as an input variable 6 to an operational amplifier. This electronic control device 5 in the form of an operational amplifier then delivers an output voltage proportional to the variable proportional to the magnetic flux at the output 7, this output voltage being supplied to the coil 4 of the electromagnetic switching device. If the magnetic flux within the magnetic core then falls; i.e., if the armature is raised from the other magnetic core, the coil voltage of the operational amplifier is ultimately increased, for long enough or to such an extent that the armature is attracted
1 t k,' -gonce again and the magnetic circuit is closed once again. The simplicity of the embodiment of the magnetic flux sensor in the form of a resistor sensitive to magnetic fields within a resistance bridge connected thereto offers constructional advantages. This resistor sensitive to magnetic fields, which is directly connected to the magnetic core, does not record the magnetic field guided into the magnetic core, but the leakage field existing around the magnetic core. However, as this is also a measure of the magnetic flux guided into the magnetic core, this possibility can be used in an advantageous and effective manner. A variation of the magnetic flux within the magnetic circuit also results in a variation of the leakage flux, so that this leakage field recording also delivers a variable proportional to the magnetic flux. The resistor sensitive to magnetic fields is connected to what is referred to as a resistance bridge. The resistance bridge can be adapted in such a manner that, in the normal state; i.e., the closed state, of the magnetic circuit, the resistance ratios in the resistance bridge are symmetrical. Raising the hinged armature would result in a resistance variation in the resistor sensitive to magnetic fields, which would mean that the resistance ratios in the resistance bridge would become asymmetrical. This asymmetry generates voltage differences in the resistance bridge which then ultimately deliver the variable proportional to the magnetic flux and fed into the control device to control the coil voltage or coil current. In this arrangement, it is particularly advantageous that the magnetic flux sensor can simply be applied externally to the -10magnetic core. Figure 2 shows the use of a Hall element as a magnetic flux sensor with a further possible arrangement in the magnetic circuit. As a Hall-effect element generally consists of a thin foil which is supposed to be traversed directly in the case of optimum use of the field lines of the magnetic field, it is provided in this case to break the magnetic circuit at a defined point by means of the smallest possible air gap 8, into which the Hall-effect element is inserted. The magnetic field lines are used even more efficiently in this manner. This additional air gap naturally produces further magnetic resistance within the magnetic circuit. However, this must be tolerated when using a Hall-effect element which can have a very thin design. A variation of the magnetic flux within the magnetic circuit results in a variation of the Hall voltage, which for its part can then be supplied once again to the input 6 of the control device 5 as a variable proportional to the magnetic flux.
If the magnetic circuit is closed after voltage is applied to the coil, the coil voltage and thus the coil current is reduced accordingly to the level required to keep the magnetic circuit closed. The power loss is thus adjusted to almost zero and moreover there is permanent monitoring of the switching state of the electromagnetic switching device. Disturbance, i.e, unintentional opening, is thus always counteracted by controlling the coil voltage or coil current.
I c 11 -11In general, the operational reliability of a device of the invention is considerably increased, with the secondary effect that the working or operating temperature is also reduced.
X '_7
Claims (6)
1. An electromagnetic switching device for valves, comprising a magnetic core with an actuating coil and a movable part for connection to a said valve; a magnetic flux sensor connected to the core for detecting a variable proportional to the magnetic flux in the core, the sensor being connected to an electronic control device such that the electrical power supplied to the coil and thus movement of the movable part is controllable in acordance with the detected variable proportional to the magnetic flux.
2. An electromagnetic switching device according to Claim 1 wherein the electronic control device comprises an operational amplifier which is connected at the input to the magnetic flux sensor and at the output to the coil.
3. An electromagnetic switching device according to Claim 1 or Claim 2 wherein the magnetic flux sensor comprises a Hall-effect element.
4. An electromagnetic switching device according to Claim 1 or Claim 2 wherein the magnetic flux sensor comprises a resistance bridge provided with an electrical resistor sensitive to magnetic fields.
5. An electromagnetic switching device substantially as herein described with reference to the accompanying drawing.
6. An electromagnetically actuated valve including a device according to any preceding Claim.
h t
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4129265A DE4129265A1 (en) | 1991-08-30 | 1991-08-30 | ELECTROMAGNETIC SWITCHGEAR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9218499D0 GB9218499D0 (en) | 1992-10-14 |
| GB2259188A true GB2259188A (en) | 1993-03-03 |
Family
ID=6439759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9218499A Withdrawn GB2259188A (en) | 1991-08-30 | 1992-09-01 | Detecting the operation of an electromagnetic actuator |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE4129265A1 (en) |
| FR (1) | FR2680855A1 (en) |
| GB (1) | GB2259188A (en) |
| IT (1) | IT1256348B (en) |
| SE (1) | SE9202445L (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997021237A2 (en) * | 1995-12-05 | 1997-06-12 | Siemens Aktiengesellschaft | Switchgear control apparatus |
| FR2750244A1 (en) * | 1996-06-20 | 1997-12-26 | Clausin Jacques | Force control device for proportional electromagnetic actuator |
| EP1868214A1 (en) | 2006-06-13 | 2007-12-19 | Delphi Technologies, Inc. | Direct flux control system for magnetic structures |
| CN112201538A (en) * | 2019-07-08 | 2021-01-08 | G.卡梯埃技术公司 | Electromechanical actuator with self-adjusting control |
| US11031165B2 (en) | 2017-01-19 | 2021-06-08 | Voith Patent Gmbh | Method and arrangement for determining the armature position of an electromagnet |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19506168A1 (en) * | 1995-02-22 | 1996-08-29 | Siemens Ag | Appts. for detection of switching state of protective relays |
| DE19524755A1 (en) * | 1995-07-07 | 1997-01-09 | Horst Bendrich | Switch magnets stroke-monitoring device for electromagnetically operated switch - delivers binary signal denoting travel of armature on basis of derivative of coil current drawn through low-impedance transformer winding. |
| DE19605974A1 (en) * | 1996-02-06 | 1997-08-07 | Kloeckner Moeller Gmbh | Electronic switching magnet control for switching on and holding a contactor |
| DE19605759A1 (en) * | 1996-02-06 | 1997-08-07 | Kloeckner Moeller Gmbh | Electronic switching magnet control for holding a contactor |
| DE19609608C2 (en) * | 1996-03-12 | 2001-05-23 | Bosch Gmbh Robert | Method for measuring the armature pull-in voltage and the armature pull-in voltage of a switching relay |
| FR2834119B1 (en) * | 2001-08-30 | 2004-05-21 | Moving Magnet Tech Mmt | ELECTROMAGNETIC ACTUATOR WITH TWO STABLE LIMIT POSITIONS, IN PARTICULAR FOR CONTROLLING AIR INLET DUCT VALVES FOR INTERNAL COMBUSTION ENGINES |
| DE10161497A1 (en) * | 2001-12-14 | 2003-06-26 | Wabco Gmbh & Co Ohg | Solenoid coil pressure sensor unit for EBS modulators of electronically controlled electro-pneumatic brake systems equipped with solenoid control valves |
| DE10161501A1 (en) * | 2001-12-14 | 2003-06-26 | Wabco Gmbh & Co Ohg | Solenoid coil pressure sensor unit for EBS wheel modulator control units of electronically controlled electro-pneumatic brake systems equipped with solenoid control valves and controlled via a CAN data bus |
| DE10162525C1 (en) * | 2001-12-19 | 2003-06-18 | Rexroth Mecman Gmbh | Electromagnetic multi-way valve has magnetic field sensor followed by driver stage for contactlessly transferring drive signals via external data lines within range of sensor |
| DE10331339A1 (en) * | 2003-07-10 | 2005-02-03 | Siemens Ag | Electromagnetic switching device |
| US7061352B2 (en) * | 2004-01-26 | 2006-06-13 | Tzo-Ing Lin | Noise-free low-power consumption wide voltage range DC and AC contactor and remote telephone control system using the same |
| JP4835351B2 (en) * | 2005-12-28 | 2011-12-14 | アンデン株式会社 | Relay drive circuit |
| US9947450B1 (en) | 2012-07-19 | 2018-04-17 | The Boeing Company | Magnetic core signal modulation |
| US9568563B2 (en) | 2012-07-19 | 2017-02-14 | The Boeing Company | Magnetic core flux sensor |
| US9159487B2 (en) | 2012-07-19 | 2015-10-13 | The Boeing Company | Linear electromagnetic device |
| US9455084B2 (en) | 2012-07-19 | 2016-09-27 | The Boeing Company | Variable core electromagnetic device |
| US9389619B2 (en) | 2013-07-29 | 2016-07-12 | The Boeing Company | Transformer core flux control for power management |
| US9651633B2 (en) | 2013-02-21 | 2017-05-16 | The Boeing Company | Magnetic core flux sensor |
| US10403429B2 (en) | 2016-01-13 | 2019-09-03 | The Boeing Company | Multi-pulse electromagnetic device including a linear magnetic core configuration |
| DE102018124023A1 (en) * | 2018-09-28 | 2020-04-02 | Kiekert Aktiengesellschaft | Movement coupling device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1324445A (en) * | 1970-04-22 | 1973-07-25 | Voith Getriebe Kg | Electromagnetic actuator having regulation of the force on the armature |
| GB2041573A (en) * | 1979-02-08 | 1980-09-10 | Lucas Industries Ltd | Fuel injection system for internal combustion engines |
| GB1594578A (en) * | 1977-10-21 | 1981-07-30 | Hart J C H | Electromagnetic actuator circuits |
| GB2112213A (en) * | 1981-12-21 | 1983-07-13 | Gen Electric | Electromagnetic contractor with flux sensor |
| EP0209287A1 (en) * | 1985-07-08 | 1987-01-21 | Synektron Corporation | Variable reluctance actuators having improved constant force control and position-sensing features |
| GB2183098A (en) * | 1985-11-14 | 1987-05-28 | Westinghouse Electric Corp | Magnetic sensor for armature and stator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2614926A1 (en) * | 1976-04-07 | 1977-10-13 | Hartmann & Braun Ag | Electromagnetic switch with guided contacts - has flap armature with insulator on pivoting end with intermediate spring contacts |
| DE3143916A1 (en) * | 1981-11-05 | 1983-05-11 | Robert Bosch Gmbh, 7000 Stuttgart | Electromagnetic operating device |
| US4659969A (en) * | 1984-08-09 | 1987-04-21 | Synektron Corporation | Variable reluctance actuator having position sensing and control |
-
1991
- 1991-08-30 DE DE4129265A patent/DE4129265A1/en not_active Withdrawn
-
1992
- 1992-08-26 SE SE9202445A patent/SE9202445L/en not_active Application Discontinuation
- 1992-08-28 IT ITMI922025A patent/IT1256348B/en active IP Right Grant
- 1992-08-28 FR FR9210358A patent/FR2680855A1/en active Pending
- 1992-09-01 GB GB9218499A patent/GB2259188A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1324445A (en) * | 1970-04-22 | 1973-07-25 | Voith Getriebe Kg | Electromagnetic actuator having regulation of the force on the armature |
| GB1594578A (en) * | 1977-10-21 | 1981-07-30 | Hart J C H | Electromagnetic actuator circuits |
| GB2041573A (en) * | 1979-02-08 | 1980-09-10 | Lucas Industries Ltd | Fuel injection system for internal combustion engines |
| GB2112213A (en) * | 1981-12-21 | 1983-07-13 | Gen Electric | Electromagnetic contractor with flux sensor |
| EP0209287A1 (en) * | 1985-07-08 | 1987-01-21 | Synektron Corporation | Variable reluctance actuators having improved constant force control and position-sensing features |
| GB2183098A (en) * | 1985-11-14 | 1987-05-28 | Westinghouse Electric Corp | Magnetic sensor for armature and stator |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997021237A2 (en) * | 1995-12-05 | 1997-06-12 | Siemens Aktiengesellschaft | Switchgear control apparatus |
| WO1997021237A3 (en) * | 1995-12-05 | 1997-08-21 | Siemens Ag | Switchgear control apparatus |
| FR2750244A1 (en) * | 1996-06-20 | 1997-12-26 | Clausin Jacques | Force control device for proportional electromagnetic actuator |
| EP1868214A1 (en) | 2006-06-13 | 2007-12-19 | Delphi Technologies, Inc. | Direct flux control system for magnetic structures |
| US11031165B2 (en) | 2017-01-19 | 2021-06-08 | Voith Patent Gmbh | Method and arrangement for determining the armature position of an electromagnet |
| CN112201538A (en) * | 2019-07-08 | 2021-01-08 | G.卡梯埃技术公司 | Electromechanical actuator with self-adjusting control |
| EP3764384A1 (en) | 2019-07-08 | 2021-01-13 | G. Cartier Technologies | Electromechanical actuator with self-regulated control |
| FR3098637A1 (en) * | 2019-07-08 | 2021-01-15 | G. Cartier Technologies | SELF-CONTROLLED ELECTROMECHANICAL ACTUATOR |
| CN112201538B (en) * | 2019-07-08 | 2023-11-24 | G.卡梯埃技术公司 | Electromechanical actuator with self-regulating control |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9202445L (en) | 1993-03-01 |
| IT1256348B (en) | 1995-12-01 |
| GB9218499D0 (en) | 1992-10-14 |
| FR2680855A1 (en) | 1993-03-05 |
| SE9202445D0 (en) | 1992-08-26 |
| ITMI922025A1 (en) | 1994-02-28 |
| DE4129265A1 (en) | 1993-03-04 |
| ITMI922025A0 (en) | 1992-08-28 |
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