EP2073343B1 - Capteur - Google Patents

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Publication number
EP2073343B1
EP2073343B1 EP08105990A EP08105990A EP2073343B1 EP 2073343 B1 EP2073343 B1 EP 2073343B1 EP 08105990 A EP08105990 A EP 08105990A EP 08105990 A EP08105990 A EP 08105990A EP 2073343 B1 EP2073343 B1 EP 2073343B1
Authority
EP
European Patent Office
Prior art keywords
sensor
piston
magnet
energy converter
accordance
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.)
Not-in-force
Application number
EP08105990A
Other languages
German (de)
English (en)
Other versions
EP2073343A1 (fr
Inventor
Armin Dorer
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.)
Sick AG
Original Assignee
Sick AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sick AG filed Critical Sick AG
Publication of EP2073343A1 publication Critical patent/EP2073343A1/fr
Application granted granted Critical
Publication of EP2073343B1 publication Critical patent/EP2073343B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means

Definitions

  • the invention relates to a magnetic or inductive sensor for detecting a piston position according to the preamble of claim 1, as well as the use of such a sensor.
  • Such sensors are often arranged on a housing of a working cylinder and have for accurate position determination by contactless detection of the position of z.
  • Such a sensor is for example from the DE 10 2006 008 157 A1 known. This known sensor can detect two specific piston positions. Simpler sensors detect only one piston position at a time.
  • the electrical supply of the sensor and the transmission of the switching signal via an electrical line is very time- and material-consuming, since the sensors are typically used in industrial robots and a large number of such sensors have to be used on a single robot. Harnesses with 20 to 30 lines are common. The cables are then guided via drag chains on the moving parts. Line breaks are the most frequent cause of failure with these sensors (about 80% of failures). The connection between sensor housing and connection cable is also a weak point in terms of tightness.
  • ABB offers wireless sensors whose power supply is inductively coupled through huge conductor loops, with the conductor loops spanning the entire robot cell. Such conductor loops are very space, assembly and costly and the radiated energy is very high.
  • the magnetic or inductive sensor according to the invention has an evaluation unit for detecting a piston position along a stroke of a piston, wherein the piston carries a permanent magnet formed as a piston magnet whose position can be detected by the evaluation and wherein the evaluation unit can deliver a piston position representative signal.
  • the sensor is characterized in that a power supply unit is provided for supplying energy to the evaluation unit, which has at least one piezoelectric element and at least one energy converter magnet which acts on the piezoelectric element when the piston moves and the signal can be transmitted wirelessly from the sensor to a higher-level control.
  • a force is exerted on the energy converter magnet via the piston magnet and through the magnetic coupling. This force is then transmitted to the piezoelectric element and generates a voltage in a conventional manner on the piezoelectric element.
  • the energy thus generated can be used to operate the sensor, that is to detect the piston position and to transmit a signal representing the piston position to a receiver of a higher-level control.
  • Another advantage is the associated with the freedom of the cable simple replacement of sensors.
  • a voltage generation at the piezoelectric element takes place when a compressive force or a tensile force acts on the piezoelectric element.
  • the deformation of the piezoelectric element takes place in the micron range and is therefore negligible.
  • the sensor can be formed without moving parts, whereby no mechanical wear occurs.
  • the energy generated is also largely independent of the speed of the piston magnet and thus largely independent of the speed with which the piston moves in the working cylinder. from that also results in a long service life, and compact designs are feasible. This opens up the possibility of the sensor according to the invention in a known manner (such as in DE 196 43 413 A1 or DE 196 53 222 A1 described) to place in existing mounting grooves on a working cylinder.
  • the effective direction of the energy converter magnet is perpendicular to the stroke.
  • the energy converter magnet is then attracted while passing the piston magnet in one phase to the piston magnet and repelled in another phase of the piston magnet, so that both processes can be used to generate energy.
  • the magnetic orientation of the energy converter magnet is perpendicular to the stroke. It should be noted that the power generation is independent of the polar direction of the piston magnet and the energy converter magnet, wherein advantageously the magnetic orientation of the piston magnet is in the direction of the stroke.
  • the energy converter magnet is preferably a permanent magnet.
  • the energy converter magnet exerts pressure on the piezoelectric element during movement of the piston. This can be advantageously increased by the energy converter magnet exerts the pressure via a lever on the piezoelectric element.
  • An increase of the pressure can also be achieved in that the energy converter magnet is mounted linearly movable and the energy converter magnet is moved along its storage during movement of the piston magnet and the piezoelectric element forms a stop.
  • the energy converter magnet stops the moment of inertia of the energy converter magnet additionally acts on the piezoelectric element, which can induce a significant voltage pulse in the piezoelectric element, as usually the piston on working cylinders of industrial robots and the like move very fast and the energy converter magnet, especially if its polar direction perpendicular to the piston magnet is and he is linearly displaceable in or against the polar direction, moves very abruptly and accordingly strongly strikes the piezoelectric element, which induces a correspondingly high voltage.
  • the energy converter magnet could exert a bending force on the piezoelectric element during movement of the piston in order to generate an electrical voltage on the piezoelectric element.
  • a plurality of piezoelectric elements and / or energy converter magnets may be provided in order to increase the energy yield.
  • an energy converter magnet could be sandwiched between two piezoelectric elements, so that when passing the piston magnet in a phase of movement of the piston, a force on the one piezoelectric element and in a further phase of the piston movement a force in the other direction is exerted on the other piezoelectric element ,
  • the effect of the energy converter magnet can be used on the piezoelectric element as a trigger for the signal.
  • the senor has a hermetically sealed housing, it can be used to particular advantage in work areas in which aggressive or hazardous media are used, for example in the food sector, where aggressive cleaning agents are used for cleaning purposes or in applications in which explosive media are used.
  • the senor according to the invention for determination of the piston position can be used on a pneumatic or hydraulic cylinder.
  • the sensor could be fully integrated into the pneumatic or hydraulic cylinder, which greatly facilitates the handling and cleaning of such a cylinder.
  • the piston position can be determined by means of a magnetic or inductive sensor 20, the piston 12 carrying a permanent magnet piston magnet 22 whose position the sensor 20 can detect.
  • a sensor 20 is described for example in US Pat DE 10 2004 046 107 A1 ,
  • the sensor 20 is shown in the drawing ( Fig. 1 ) is shown only schematically and contains an inductive or magnetic sensor element 24, which responds to the magnetic field of the piston magnet 22, an evaluation unit 26, which is preferably implemented in a microcontroller and in which the signals of the sensor element 24 are further processed, and optionally necessary memory.
  • the sensor 20 is positioned on the power cylinder 10 so that it can detect the desired piston position via the sensor element 24 or it is adapted to be electronically adjusted to certain piston positions.
  • the senor 20 has a power supply unit 28 which is suitable for supplying the sensor 20 with electrical energy and which will be explained in more detail below. Furthermore, the sensor 20 has a transmission unit 30, by means of which signals of the sensor 20, which indicate, inter alia, the piston position, are wirelessly transmitted to a higher-level control.
  • the energy supply unit 28 has an energy converter magnet 32 in the form of a permanent magnet, which is sandwiched between two piezoelements 34 and 36, for example can be glued to them.
  • the piston magnet 22 Upon movement of the piston 12, the piston magnet 22 is guided past the energy converter magnet 32, so that it experiences a force in different phases of movement in the direction of the double arrow 38 perpendicular to the stroke movement of the piston, as will be explained in more detail below.
  • the energy converter magnet 32 exerts compressive forces in the various phases - and when the piezoelements 34 and 36 and the energy converter magnet 32 are glued together, tensile forces also act on the piezoelement 34 and the piezoelement 36.
  • voltages are induced in the piezoelectric elements 34 and 36, which are supplied via suitable and only schematically illustrated lines 40 and 42 of a power supply electronics 44, in order ultimately to be able to supply the sensor 20 with electrical energy.
  • the magnetic orientation of the piston magnet 22 in the direction of the stroke ie in the direction of the arrow 16 and the magnetic orientation of the energy converter magnet 32 is perpendicular to the stroke.
  • the north pole of the energy converter magnet 32 is first attracted by the south pole of the piston magnet 22, so that in this phase via the energy converter magnet 32 a compressive force is exerted on the piezoelectric element 36 and this can supply an electrical voltage to the power supply electronics 44.
  • the effective directions of the magnets are aligned parallel or anti-parallel to each other.
  • the energy converter magnet could be oriented in the direction of the stroke, ie rotated by 90 ° in one direction or the other in relation to the illustration in FIG Fig. 2 ,
  • the electrical voltage and thus the energy that can be recovered is independent of the speed with which the piston 12 moves in the working cylinder 10, but is dependent on the force that the energy converter magnet 32 can exert on the piezo elements 34 and 36 , Also, this type of power generation is largely independent of the polar direction of the piston magnet 22 and the energy converter magnet 32nd
  • Fig. 3 is an alternative embodiment to that of Fig. 2 shown.
  • the energy converter magnet 32 is mounted linearly movable, so that it can move freely in the direction of the double arrow 38.
  • the storage can be realized, for example, in that the energy converter magnet 32 is held in a tube 46, which is longer than the energy converter magnet 32.
  • the energy transducer magnet 32 Upon movement of the piston magnet 22, the energy transducer magnet 32 reacts as described above, where it can now move along its bearing in the tube 46 in the direction 38 and thus can exert only compressive forces on the piezoelectric element 34 or 36.
  • the piezoelectric elements 34 and 36 each form stops of the displacement path of the energy converter magnet 32.
  • the piston 12 moves relatively quickly and accordingly the energy converter magnet 32 from one stop (piezo element 34 or 36) to the other stop (piezo element 36 or 34) shifted, due to the inertia of the energy converter magnet 32, a strong increase in the pressure at the moment of the stop on the relevant piezoelectric element takes place. As a result, a significantly increased voltage pulse is induced in the piezoelectric element.
  • only one piezo element can be provided at one end of the displacement path.
  • the energy converter magnet 32 is disposed at one end of a lever arm 50, and the other end of the lever arm 50 is fixedly located at a point 52.
  • the two piezo elements 34 and 36 are arranged so that upon exercise of a force in the direction of the double arrow 38 on the energy converter magnet 32 via the lever arm 50, either a compressive force on the piezoelectric element 34 when power is applied upward or pressure on the piezoelectric element 36 is applied via the lever arm 50 when power is applied to the energy converter magnet 32 down.
  • the voltage induced on the piezoelectric elements via the pressure is supplied to the energy supply electronics 44. Due to the leverage effect of the lever arm 50, larger forces can be exerted on the piezoelements 34 and 36 with this embodiment and thus higher voltages can be generated for the energy supply. Also, multiple energy converter magnets 32 could be placed on the lever arm 50 to further increase the force on the piezo elements 34 and 36.
  • a piezoelectric element 34 is provided, that is firmly clamped at one end and at the other end 62 of the energy converter magnet 32 is arranged, which is possibly connected to the force increase via a lever arm 64 to the end 62.
  • a force on the energy converter magnet As in the previous embodiments, the piezoelectric element 34 experiences a bending force, which in turn induces an electrical voltage which is dissipated to the energy supply electronics 44.
  • the bending movement of the piezoelectric element 34 is indicated by the curved shape of the double arrow 38.
  • Fig. 5 has the further advantage that it can be built very compact, since the sandwich-like structure is eliminated.
  • the piston position signal can be triggered when the power supply unit is active, that is, an effect of the energy converter magnet on the piezoelectric element by the movement of the piston he follows.
  • the sensor element 24 could be omitted and the sensor 20 can be made even more cost-effective overall.
  • a housing of the sensor can be made hermetically sealed. It could even be completely integrated into a pneumatic or hydraulic cylinder with the exception of an antenna.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Claims (14)

  1. Capteur magnétique ou inductif pour détecter la position d'un piston le long d'un trajet de déplacement d'un piston d'un cylindre de travail, dans lequel le piston porte un aimant de piston réalisé sous forme d'aimant permanent, comprenant une unité d'évaluation électronique au moyen de laquelle la position du piston peut être détectée et qui est capable de délivrer un signal représentant la position du piston,
    caractérisé en ce que pour l'alimentation en énergie de l'unité d'évaluation, il est prévu une unité d'alimentation en énergie qui comprend au moins un élément piézoélectrique et au moins un aimant convertisseur d'énergie, qui agit sur l'élément piézoélectrique lors d'un déplacement du piston, et en ce que le signal est susceptible d'être transmis sans fil depuis le capteur vers une commande maître.
  2. Capteur selon la revendication 1, caractérisé en ce que la direction d'action de l'aimant convertisseur d'énergie est perpendiculaire au trajet de déplacement.
  3. Capteur selon l'une des revendications précédentes, caractérisé en ce que l'orientation magnétique de l'aimant convertisseur d'énergie est perpendiculaire au trajet de déplacement.
  4. Capteur selon l'une des revendications précédentes, caractérisé en ce que l'orientation magnétique de l'aimant de piston est dans la direction du trajet de déplacement.
  5. Capteur selon l'une des revendications précédentes, caractérisé en ce que l'aimant convertisseur d'énergie est un aimant permanent.
  6. Capteur selon l'une des revendications précédentes, caractérisé en ce que l'aimant convertisseur d'énergie exerce une pression sur l'élément piézoélectrique lors d'un déplacement du piston.
  7. Capteur selon la revendication 6, caractérisé en ce que l'aimant convertisseur d'énergie est monté linéairement mobile et lors d'un déplacement de l'aimant de piston, l'aimant convertisseur d'énergie est déplacé le long de sa monture et l'élément piézoélectrique forme une butée.
  8. Capteur selon la revendication 6, caractérisé en ce que l'aimant convertisseur d'énergie exerce la pression via un levier sur l'élément piézoélectrique.
  9. Capteur selon l'une des revendications précédentes, caractérisé en ce que l'aimant convertisseur d'énergie exerce lors d'un déplacement du piston une force de flexion sur l'élément piézoélectrique.
  10. Capteur selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu plusieurs éléments piézoélectriques, et en ce qu'un aimant convertisseur d'énergie est associé à chacun.
  11. Capteur selon l'une des revendications précédentes, caractérisé en ce que l'action de l'aimant convertisseur d'énergie sur l'élément piézoélectrique est utilisée à titre de déclencheur pour le signal.
  12. Capteur selon l'une des revendications précédentes, caractérisé par un boîtier hermétiquement étanche.
  13. Utilisation d'un capteur selon l'une des revendications précédentes pour la détermination de la position du piston dans un cylindre pneumatique ou hydraulique.
  14. Utilisation d'un capteur selon l'une des revendications précédentes pour l'intégration dans un cylindre pneumatique ou hydraulique.
EP08105990A 2007-12-21 2008-12-16 Capteur Not-in-force EP2073343B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007062909A DE102007062909A1 (de) 2007-12-21 2007-12-21 Sensor

Publications (2)

Publication Number Publication Date
EP2073343A1 EP2073343A1 (fr) 2009-06-24
EP2073343B1 true EP2073343B1 (fr) 2012-02-08

Family

ID=40453954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105990A Not-in-force EP2073343B1 (fr) 2007-12-21 2008-12-16 Capteur

Country Status (3)

Country Link
EP (1) EP2073343B1 (fr)
AT (1) ATE545187T1 (fr)
DE (1) DE102007062909A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101949401B (zh) * 2010-09-25 2012-09-05 三一集团有限公司 油缸行程检测装置、液压系统及具有该系统的工程机械
DE102013107210B4 (de) * 2013-07-09 2015-09-10 Sartorius Lab Instruments Gmbh & Co. Kg Piezoelektrische Kraftmessvorrichtung
DE102017213588A1 (de) * 2017-08-04 2019-02-07 Skf Lubrication Systems Germany Gmbh Schmiersystem mit einem Energieerzeugungselement
JP6718584B2 (ja) * 2018-01-26 2020-07-08 Smc株式会社 流体圧シリンダ
EP3983686A1 (fr) * 2019-06-11 2022-04-20 Sprega, Matteo Dispositif actionné par fluide
US20210344318A1 (en) * 2020-04-29 2021-11-04 Timothy J Gindele Piezo Magnetic Resonator/Amplifier
DE102021112746A1 (de) * 2021-05-17 2022-11-17 Hans E. Winkelmann, Gesellschaft mit beschränkter Haftung Zylinder, Verwendung eines Zylinders

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19643413C2 (de) 1996-10-24 1999-11-25 Soyck Gmbh Halterung für Magnetfeldsensoren
DE19653222C2 (de) 1996-12-20 1999-04-01 Soyck Gmbh Halterung für Magnetfeldsensoren
US6535135B1 (en) * 2000-06-23 2003-03-18 The Timken Company Bearing with wireless self-powered sensor unit
DE10150128C2 (de) * 2001-10-11 2003-10-02 Enocean Gmbh Drahtloses Sensorsystem
JP2003189641A (ja) * 2001-12-12 2003-07-04 Nec Tokin Corp 発電装置
DE102004046107A1 (de) 2004-09-23 2006-04-06 Sick Ag Sensor
DE202004017906U1 (de) * 2004-11-11 2006-03-23 Hübner Elektromaschinen GmbH Spannungsgenerator mit einem piezoelektrischen Wandlerelement
JP4259458B2 (ja) * 2004-11-30 2009-04-30 パナソニック電工株式会社 圧電型発電機構
DE102005015948A1 (de) * 2005-04-07 2006-10-12 Festo Ag & Co Fluidische Komponente, insbesondere fluidischer Aktor, mit wenigstens einer Sensoreinrichtung
FI118838B (fi) * 2005-06-28 2008-03-31 Kimmo Eino Eljas Jokelainen Liikkuvien kohteiden langattomien mittaus- tai valvontajärjestelmien käyttösähkön muodostaminen
DE102006008157A1 (de) 2006-02-22 2007-09-06 Sick Ag Magnetischer Sensor

Also Published As

Publication number Publication date
ATE545187T1 (de) 2012-02-15
EP2073343A1 (fr) 2009-06-24
DE102007062909A1 (de) 2009-06-25

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