EP2587496A1 - Aimant commutable bistable avec détecteur de position de piston - Google Patents

Aimant commutable bistable avec détecteur de position de piston Download PDF

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Publication number
EP2587496A1
EP2587496A1 EP12184928.5A EP12184928A EP2587496A1 EP 2587496 A1 EP2587496 A1 EP 2587496A1 EP 12184928 A EP12184928 A EP 12184928A EP 2587496 A1 EP2587496 A1 EP 2587496A1
Authority
EP
European Patent Office
Prior art keywords
piston
switching
magnet
bistable
magnetic field
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.)
Granted
Application number
EP12184928.5A
Other languages
German (de)
English (en)
Other versions
EP2587496B1 (fr
Inventor
Gerhard Schöner
Ewald Lampl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MSG Mechatronic Systems GmbH
Original Assignee
MSG Mechatronic Systems GmbH
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Publication date
Application filed by MSG Mechatronic Systems GmbH filed Critical MSG Mechatronic Systems GmbH
Publication of EP2587496A1 publication Critical patent/EP2587496A1/fr
Application granted granted Critical
Publication of EP2587496B1 publication Critical patent/EP2587496B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • H01F7/18—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
    • H01F2007/185—Monitoring or fail-safe circuits with armature position measurement
    • 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
    • H01F7/1872—Bistable or bidirectional current devices

Definitions

  • the invention relates to a bistable solenoid with an excitation coil and, with respect to the excitation coil by a switching current in the excitation coil in a first switching position and a second switching position, adjustable piston and a piston position detector for detecting whether the piston is moved to its first or second switching position is.
  • the piston is connected to a sealing element, which releases or interrupts the flow of a medium through a valve arranged outside the switching magnet, depending on the piston position.
  • the document EP 2 164 081 A2 discloses a switching magnet in which the piston position detector is formed by two mechanical contacts. Depending on the switching position of the piston of the solenoid either one or the other mechanical contact is closed.
  • the provision of mechanical contacts has the disadvantage of additional friction and mechanical wear of the contacts.
  • the invention has for its object to provide a solenoid with piston position detector, in which the above-mentioned disadvantages are avoided.
  • this task is solved in that the piston position detector is formed by at least one magnetic flux density in the magnetic circuit generating permanent magnet and arranged in the magnetic circuit magnetic field sensor, both of which are provided with respect to the excitation coil immovably fixed in the switching magnet, and wherein the piston position detector has evaluation means which, for the detection of the piston position, evaluate the magnetic flux density in the magnetic circuit measured by the magnetic field sensor and dependent on the switching position of the piston.
  • the advantage is obtained that the detection of the current position of the piston in the switching magnet takes place without contact. Since the magnetic field sensor does not detect the magnetic field generated by the exciting coil only for switching the switching position of the piston, but the magnetic field always present through the permanent magnet, the detection of the piston position can always take place when the piston has assumed one of its two possible switching positions.
  • position detectors are known in which on the Moving part (eg locking pin or piston) is a permanent magnet is fixed and detected with a stationary magnetic field sensor, whether the permanent magnet is close (eg first switching position) or far away (eg second switching position) of the magnetic field sensor.
  • the invention can be dispensed with this additional for the position detector permanent magnet on the moving part (piston of the switching magpie), since the magnetic field of the permanent magnet is used for position detection, which is provided for holding the piston in its second switching position.
  • costs can be saved in the production of the solenoid.
  • the piston without a permanent magnet mounted on the piston can be made lighter and more mobile, which is advantageous both in terms of the switching speed and for the current required for switching current of the switching current.
  • FIG. 1 shows a bistable solenoid 1 as part of a bistable diaphragm valve, which is designed according to this example for shutting off or releasing a water pipe of a car.
  • the water is supplied to the diaphragm valve in a volume and discharged through another volume of the diaphragm valve again.
  • the solenoid 1 has a piston 4, which in FIG. 1 is shown in its first switching position.
  • a spring 5 presses a stop ring 6 with a spring force FK in the direction R against a stop surface 7 of the housing of the solenoid 1.
  • the volume and the other volume are connected together and it is the water flow in the line of the Diaphragm valve released.
  • the piston 4 is displaceable against the spring force FK against the direction R in a second switching position.
  • a sealing element not shown in the figures seals the volume against the other volume, so that the flow of water is interrupted in the line.
  • Switching magnets according to the invention can be used for a large number of other application examples, which are not discussed in more detail in this description.
  • the solenoid 1 is formed bistable, which is why the piston 4 is positioned either held in its first switching position or in its second switching position.
  • the spring 5 holds the piston 4 with the spring force FK in its first switching position.
  • the switching magnet 1 further has a permanent magnet 8 which exerts a magnetic attraction force MK against the direction R on the piston 4 via a pole core 9.
  • the magnetic attraction force MK is too weak to move the piston 4 from its first switching position to its second switching position.
  • the spring force FK is too weak to move the piston 4 from its second switching position to its first switching position.
  • the solenoid 1 now further comprises an excitation coil 10, in which a switching current (DC) can be fed with a first polarity to move the piston 4 from its first switching position to its second switching position, and in a switching current with a second polarity can be fed to adjust the piston 4 from its second switching position to its first switching position.
  • a switching current DC
  • the shift solenoid 1 further includes a piston position detector for detecting whether the piston is adjusted to its first or second shift position. On the basis of this information from the piston position detector, for example, the vehicle electronics check the switching state of the piston 4 and initiate appropriate measures in case of deviations from the desired state.
  • the piston position detector comprises a Hall sensor 11, the permanent magnet 8 and evaluation means, which in the FIG. 1 are not shown in detail.
  • a magnetic circuit is formed, via which the magnetic flux of the permanent magnet 8 from the permanent magnet 8 via the pole core 9, the piston 4 and the air gap between the piston 4 and the pole core 9 or the housing, is passed through the housing of the switching magnet 1 to the permanent magnet 8.
  • a switching current is impressed into the excitation coil 10
  • the magnetic flux of the excitation coil superimposed on the magnetic flux of the permanent magnet 8, whereby the piston 4 is adjusted between its two switching positions.
  • the Hall sensor 11 is now mounted between the piston 4 and the housing in the region of the magnetic circuit, which is why the Hall sensor 11 measures the magnetic flux density in the magnetic circuit.
  • FIG. 2 a measurement characteristic M of the flux density measured in millitesla [mT] by the Hall sensor 11 as a function of the length in millimeters [mm] of the air gap of the piston 4 to the pole core 9 is shown.
  • the length of the air gap is about 0 mm and the Hall sensor 11 measures a magnetic flux density of about 24 mT.
  • Evaluation means of the piston position detector are now adapted to detect that the piston 4 is adjusted to its first switching position when the measured magnetic flux density is smaller than a lower threshold OS of 7 mT. Furthermore, the evaluation means of the piston position detector detects that the piston 4 is adjusted to its second switching position when the measured magnetic flux density is greater than an upper threshold value US of 18 mT.
  • the dependence of the magnetic flux in the magnetic circuit on the switching position of the piston 4 and the application of the upper threshold OS and lower threshold US has the advantage that the piston position detector can detect the switching position of the piston 4 without contact and without an additional permanent magnet.
  • the specified threshold values are to be understood as an example and depend on the particular design of the switching magnet and the magnetic field strength of the permanent magnet.
  • the Hall sensor 11 may be formed as a threshold value switch, which advantageously thereby already takes over the evaluation of the evaluation. As a result, it is thus possible to dispense with separate evaluation means.
  • a solenoid 12 is shown as a second embodiment of the invention.
  • the switching magnet 12 has the same structure as the switching magnet 1, wherein additionally a second permanent magnet 13 is attached as part of the piston position detector on the side of the Hall sensor 11 on the piston 4.
  • the second permanent magnet 13 can be used to influence the magnetic flux density at the magnetic field sensor. For some magnetic field sensors, a signal symmetric about the 0-point is advantageous. In this case, the second permanent magnet 13 is reversely poled as the permanent magnet. 8
  • NdFeB magnets known to those skilled in the art from other fields. These NdFeB magnets are characterized by their large magnetic field strength with relatively small volume of the permanent magnet.
  • the position of the Hall sensor 11 immediately adjacent to the displaced in its first switching position piston 4 has proved advantageous for constructive considerations.
  • Other positions of the Hall sensor 11 in the region of the magnetic circuit or the stray field of the magnetic circuit would be possible for the measurement of the magnetic flux density in the magnetic circuit.
  • a threshold value of the magnetic flux density would have to be determined which corresponds to the respective length of the air gap between the piston 4 and the pole core 9.
  • the bistable solenoid could also have a permanent magnet on each side of the piston, in which case the spring 5 would not be necessary and each of the permanent magnets would hold the piston in one of the two shift positions. Furthermore, it is also possible to use arrangements with two coils and a radial permanent magnet between the coils.
  • the solenoid could have a connectable to a data bus control electronics, the from the data bus, a switching information can be fed and which is designed to evaluate the switching information and for outputting the switching current to the excitation coil.
  • a data bus protocol the protocol according to a so-called LIN bus (Local Interconnected Network) has proven to be advantageous in automotive applications.
  • the bistable solenoid can also be provided in a switching valve, with the example, the water or oil supply is controlled.
  • the advantage is obtained that a likewise connected to the LIN bus control unit of a car via only one data line can deliver the switching information to the bistable switching valve, whereby costs can be saved and digital processing is possible.
  • the evaluation means of the Kolbepositionsdetektors a position information can be delivered to the control electronics, which at certain times (eg every three seconds) and / or on request of the control unit of the car outputs the position information via the data bus to the control unit.
  • the control unit of the car is always informed about the current position of the piston of the bistable switching valve, whereby the troubleshooting in the workshop is much easier.
  • the magnetic flux density of the permanent magnet 8 may be mitigated weakening or amplifying.
  • the polarity as attenuating has proven to be advantageous in the embodiment.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP20120184928 2011-10-27 2012-09-19 Aimant commutable bistable avec détecteur de position de piston Not-in-force EP2587496B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT15832011A AT512065A1 (de) 2011-10-27 2011-10-27 Bistabiler schaltmagnet mit kolbenpositionsdetektor

Publications (2)

Publication Number Publication Date
EP2587496A1 true EP2587496A1 (fr) 2013-05-01
EP2587496B1 EP2587496B1 (fr) 2014-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120184928 Not-in-force EP2587496B1 (fr) 2011-10-27 2012-09-19 Aimant commutable bistable avec détecteur de position de piston

Country Status (2)

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EP (1) EP2587496B1 (fr)
AT (1) AT512065A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016042088A1 (fr) * 2014-09-18 2016-03-24 Eto Magnetic Gmbh Dispositif d'actionnement électromagnétique bistable
CN107256755A (zh) * 2017-07-31 2017-10-17 中国船舶重工集团公司第七0七研究所 一种内置双向位置检测的自保持电磁铁
EP3264431A1 (fr) * 2016-07-01 2018-01-03 Safran Landing Systems Electro-aimant linéaire bistable
CN108006302A (zh) * 2017-11-08 2018-05-08 中国航空工业集团公司金城南京机电液压工程研究中心 一种基于双线圈温升控制的电磁活门
DE102017125786A1 (de) 2017-11-06 2019-05-09 Schaeffler Technologies AG & Co. KG Bistabiler Linearmagnet

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10571041B2 (en) 2015-08-28 2020-02-25 Taylor Commercial Foodservice Inc. Bi-stable changeover valve
CN106017712B (zh) * 2016-07-26 2018-09-07 华中科技大学 活塞瞬态温度检测系统及发动机
CN109599248B (zh) * 2018-11-30 2021-05-25 中国工程物理研究院应用电子学研究所 一种1.8t紧凑型低功耗强场直流磁体

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5769043A (en) * 1997-05-08 1998-06-23 Siemens Automotive Corporation Method and apparatus for detecting engine valve motion
DE10054308A1 (de) * 2000-11-02 2002-06-13 Conti Temic Microelectronic Aktor zur elektromagnetischen Ventilsteuerung mit zwei Elektromagneten
GB2380065A (en) * 1998-10-08 2003-03-26 Camcon Ltd Magnetic actuator
EP1491862A1 (fr) * 2003-06-25 2004-12-29 Festo AG & Co Appareil de détection magnétique de position pour vannes
DE102005058376A1 (de) * 2004-12-06 2006-06-08 Kendrion Binder Magnete Gmbh Geräuschoptimierter Hubaktor
WO2007079767A1 (fr) * 2005-12-22 2007-07-19 Siemens Aktiengesellschaft Procédé et dispositif permettant de faire fonctionner un appareil de commutation
EP2164081A2 (fr) 2008-09-10 2010-03-17 MSG Mechatronic Systems GmbH Aimant commutable
WO2011098353A1 (fr) * 2010-02-15 2011-08-18 Robert Bosch Gmbh Dispositif de direction pour véhicule à moteur

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0971100B1 (fr) * 1998-07-07 2003-09-03 DaimlerChrysler AG Protection magnétique pour actionneur de soupape électromagnétique
CA2722717C (fr) * 2008-05-16 2016-09-20 G.W. Lisk Company, Inc. Capteur integre pour controle de position

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5769043A (en) * 1997-05-08 1998-06-23 Siemens Automotive Corporation Method and apparatus for detecting engine valve motion
GB2380065A (en) * 1998-10-08 2003-03-26 Camcon Ltd Magnetic actuator
DE10054308A1 (de) * 2000-11-02 2002-06-13 Conti Temic Microelectronic Aktor zur elektromagnetischen Ventilsteuerung mit zwei Elektromagneten
EP1491862A1 (fr) * 2003-06-25 2004-12-29 Festo AG & Co Appareil de détection magnétique de position pour vannes
DE102005058376A1 (de) * 2004-12-06 2006-06-08 Kendrion Binder Magnete Gmbh Geräuschoptimierter Hubaktor
WO2007079767A1 (fr) * 2005-12-22 2007-07-19 Siemens Aktiengesellschaft Procédé et dispositif permettant de faire fonctionner un appareil de commutation
EP2164081A2 (fr) 2008-09-10 2010-03-17 MSG Mechatronic Systems GmbH Aimant commutable
WO2011098353A1 (fr) * 2010-02-15 2011-08-18 Robert Bosch Gmbh Dispositif de direction pour véhicule à moteur

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016042088A1 (fr) * 2014-09-18 2016-03-24 Eto Magnetic Gmbh Dispositif d'actionnement électromagnétique bistable
CN106688061A (zh) * 2014-09-18 2017-05-17 Eto电磁有限责任公司 双稳态电磁致动器设备
US10217554B2 (en) 2014-09-18 2019-02-26 Eto Magnetic Gmbh Bistable electromagnetic actuator device
CN106688061B (zh) * 2014-09-18 2019-07-16 Eto电磁有限责任公司 双稳态电磁致动器设备
EP3264431A1 (fr) * 2016-07-01 2018-01-03 Safran Landing Systems Electro-aimant linéaire bistable
US10176915B2 (en) 2016-07-01 2019-01-08 Safran Landing Systems Bistable linear electromagnet
CN107256755A (zh) * 2017-07-31 2017-10-17 中国船舶重工集团公司第七0七研究所 一种内置双向位置检测的自保持电磁铁
DE102017125786A1 (de) 2017-11-06 2019-05-09 Schaeffler Technologies AG & Co. KG Bistabiler Linearmagnet
CN108006302A (zh) * 2017-11-08 2018-05-08 中国航空工业集团公司金城南京机电液压工程研究中心 一种基于双线圈温升控制的电磁活门

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Publication number Publication date
AT512065A1 (de) 2013-05-15
EP2587496B1 (fr) 2014-06-04

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