EP2511918B1 - Dispositif et procédé de détermination de la position d'un objet sur un électroaimant - Google Patents

Dispositif et procédé de détermination de la position d'un objet sur un électroaimant Download PDF

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Publication number
EP2511918B1
EP2511918B1 EP12154928.1A EP12154928A EP2511918B1 EP 2511918 B1 EP2511918 B1 EP 2511918B1 EP 12154928 A EP12154928 A EP 12154928A EP 2511918 B1 EP2511918 B1 EP 2511918B1
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EP
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Prior art keywords
armature
magnetic coil
electromagnet
current
switching element
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EP12154928.1A
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German (de)
English (en)
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EP2511918A1 (fr
Inventor
Ralf Raupold
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SVM Schultz Verwaltungs GmbH and Co KG
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SVM Schultz Verwaltungs GmbH and Co KG
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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
    • H01F7/18—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
    • 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

Definitions

  • the invention relates to a method for determining the position of an object with respect to the magnetic coil of an electromagnet, wherein the electromagnet has a magnetic coil through which electrical current flows and the magnetic field generated by the current-carrying magnetic coil acts on the object.
  • the invention comprises a device for the Determining the position of an object with respect to the magnetic coil of an electromagnet, wherein the electromagnet has a magnetic coil through which electrical current flows and the magnetic field generated by the current-carrying magnetic coil acts on the object.
  • an electromagnet has a magnetic coil which can be flowed through by electric current, and the magnetic field of the magnetic coil generated by the current flow acts on an object serving various purposes.
  • a movably mounted armature is provided which is arranged or guided in an armature space and the armature space is at least partially surrounded by the magnet coil and that generated by the magnet coil Magnetic field acts on the anchor.
  • a magnet is realized by the fact that the energized solenoid, for example, holds a magnetizable object.
  • the magnetic field of the magnetic coil serves to compensate at least partially for the magnetic field generated by a permanent magnet of the holding magnet, which is responsible for holding the object, and thus to "switch it off".
  • the magnetic coil basically has the task, for example, for movement, holding or positioning purposes (this list is not exhaustive) to act on an object.
  • the document DE 100 20 896 A1 discloses a method for determining the position of an armature of an actuator. For this purpose, current and / or voltage drop across an exciter coil determined from this, the magnetic flux is determined by the excitation coil and a map that maps the relationship between flow and position, the position is finally determined.
  • the document DE 197 33 138 A1 shows a method for detecting the armature system in an electromagnetic actuator for actuating an actuator, which is brought and held from a first actuating position against the force of a return spring upon energization of the electromagnet on the pole face of the electromagnet.
  • the controlled or pulsed current profile for the holding phase is detected in the time provided for the armature support and converted into a current-proportional voltage.
  • the converted voltage is differentiated and detected as a detection signal, both in the case of "armature is on” and in the case of "armature is off".
  • the invention proposes a method for determining the distance to be specified as an object with respect to the magnetic coils of an electromagnet as described above, which is characterized in that in the inlet or outlet a controllable switching element is arranged, through which the current-carrying magnetic coil is disconnected from the supply voltage during a period of time, whereupon the magnetic coil generates a voltage pulse, the time course of which depends on the position of the object with respect to the magnetic coil and this time course of the voltage pulse of an evaluation unit for determining the position of the object in the electromagnet is forwarded.
  • the invention also includes an improvement of the initially proposed device, wherein the proposed device according to the invention is characterized in that the device comprises a controllable switching element which is arranged in the supply or discharge of the magnetic coil and the device comprises an evaluation unit which the Evaluates voltage pulse, which arises during the period in which the current-carrying solenoid is disconnected from the supply voltage.
  • the proposal according to the invention is suitable for determining the position of an (arbitrary) object with respect to the magnetic coil of an electromagnet.
  • the object may, for example, be immersed in the magnetic coil, as is provided, for example, in the application of a lifting magnet (with an armature) or else the object on which the magnetic field of the magnetic coil acts is seen, for example, in the axial direction of the magnetic coil, arranged before, laterally or outside the magnetic coil, as it is for example in a magnet.
  • the trick of the invention is that the position of the object relative to the magnetic coil changes the inductance of the magnetic coil, which is reflected in the evaluation of the voltage pulse generated when switching off the coil current.
  • the magnetic coil If a current-carrying magnetic coil is disconnected from the supply voltage, the magnetic coil generates a voltage pulse as a function of the coil inductance.
  • the coil inductance in turn depends on the position of the object (or armature) relative to the magnetic coil. Depending on the coil inductance or position of the object or armature, therefore, the time course of the voltage pulse changes.
  • the proposal according to the invention does not require any changes in the electromagnet itself, that is to say that it is neither necessary to install additional sensors in the electromagnet, nor to realize a double coil system. Even the evaluation unit can be arranged away from the electromagnet, since the voltage pulse occurs at the switch to ground and the place where the evaluation unit is arranged, therefore, is essentially freely selectable.
  • the solenoid receives a double function by the proposal according to the invention. This not only serves to generate a magnetic field which acts on the object in a suitable manner, but by clever wiring this magnetic coil acts (temporarily) as a sensor coil and provides a determination of the position of the object / armature serving voltage signal.
  • the inventive proposal is further characterized by the fact that a simple evaluation principle is possible. Furthermore, the invention allows, for example, a sensing of the tightened or dropped anchor position.
  • an anchor is provided as the object and the method or apparatus for determining the position of an armature in an electromagnet is used.
  • the electromagnet has a, the armature receiving, at least partially surrounding of the solenoid coil space.
  • the magnetic field generated by the current-carrying magnetic coil acts on the armature in such a way that, for example, the armature is moved or positioned or held in position.
  • the armature influences the inductance of the magnetic coil or, in other words, the inductance is a function of the position of the armature or object on which the magnetic coil acts.
  • This proposal according to the invention relates both to the method and the device according to the invention.
  • the coil current is measured by a current measuring device and this measured value is fed to the evaluation unit. Cleverly, this happens just before disconnecting the supply voltage from the solenoid coil.
  • a constant current source is used.
  • a first proposal for determining the position of the object or armature in the electromagnet is carried out, for example, by comparing the drop characteristic of the voltage pulse with stored in the evaluation unit reference curves.
  • the reference curves have been generated for example by appropriate experimental setups, in which the respective anchor layers or layers of the object are assigned as fixed parameters. By comparing the measured voltage pulses with these reference curves, it is possible to easily determine the position of the armature or object.
  • the supply voltage during a period of time which is characterized by an initial time (t A ) and end time (t E ).
  • a value characterizing the voltage pulse is the voltage level at the end of the time span, that is to say at the end time t E , as in particular still further Fig. 2 will be executed.
  • the evaluation unit measures the course and / or the height of the voltage pulse in a time window which lies within the time span, and from this the position of the armature or object is determined.
  • the time window is always at the same temporal "location" within the time span.
  • the time window also has a preferably constant width in order to always provide the same measurement conditions.
  • the actual voltage value at the beginning, at the end or in the time window averaged
  • the differential curve of the voltage within the time window or the difference of the voltage at the beginning and end of the time window is a criterion, or else the differential curve of the voltage within the time window or the difference of the voltage at the beginning and end of the time window. The determined thereby, The values characterizing the voltage pulse are then compared again with corresponding references, which are stored in the evaluation unit, and from this the position of the armature or object is determined.
  • a switching threshold is provided, and the evaluation unit determines the time until the course of the voltage pulse falls below the switching threshold. From this time, the position of the anchor is deduced. This is again done by comparing the measured time with a corresponding reference table. It is clear that the switching threshold is a voltage value that can be defined in the evaluation unit.
  • the evaluation unit determines the area between a reference voltage curve and the voltage pulse or the area below the voltage pulse and from this the position of the object or armature is determined.
  • an integration below the respective voltage curve, either the reference voltage curve or the course of the voltage pulse is determined in the tU diagram and the position either by subtraction or by the determinations of the area below the voltage pulse and a subsequent comparison with a corresponding reference value the object or anchor determined.
  • the solenoid is temporarily disconnected from the supply voltage during the period of time.
  • the time period is smaller, in particular ten times smaller than the time duration of the switching operation of the electromagnet.
  • an electromagnet in which the invention is used, operated periodically.
  • a period is described by the fact that the object is at the start time of the period or the electromagnet with at least one (interchangeable) object each at the same or comparable position or state and the arrangement at the end of the period also returns to this postion / this state.
  • This period or period length of the switching process, or energizing process is significantly greater than the time period within which the current flow through the solenoid is turned off. This period of time is within the period of the switching or Bestromungsvorganges and can be very short in special applications, especially with long-lasting Bestromungsvor réellen.
  • the time duration of the energization of the magnetic coil of the electromagnet in which the magnetic field generated by the magnetic coil for positioning, movement or switching operation of the object or armature or for at least Operakompen-sation of the magnetic field of a permanent magnet is used.
  • the duration of the electromagnet acts on the object, So for example, the magnet on the object to be held by him or the solenoid on the anchor.
  • this period of time can occupy a large part of the period length of the switching or energizing process or, for example, in currentless positioning tasks, the duration is relatively short and, for example, only 1% to 50% of the period of the switching or energizing process, preferably about 1% to 30%, particularly preferably 1% to 10%.
  • the time period is arranged within the time period and chosen to be relatively short, switching off the holding current through the magnetic coil will result in no or an irrelevant change in the position of the object or armature.
  • the time is long enough to gather enough data from the t-U trace to determine the actual location of the article relative to the solenoid (for example, the armature relative to the solenoid and so on).
  • the holding task of the solenoid is briefly interrupted to perform the sensor task with the magnetic coil for position positioning.
  • the proposal also allows, for example, the time period to be outside the time period.
  • the object or, for example, the armature is correspondingly positioned during or on the electromagnet. This period is relatively short in relation to the period of the switching or Bestromungsvorganges.
  • the solenoid is briefly energized, wherein the current pulse is so short that this does not result in a change in the position of the object or armature.
  • the current flow is switched off again, its position can be determined by the decay of the voltage curve, which is a function of the inductance and thus the position of the object / armature relative to the magnetic coil.
  • the use of the magnetic coil as a sensor coil follows, with a certain time interval for the use of the magnetic coil as a holding means.
  • the invention not only relates to a method as described, but also relates to an advantageously equipped device.
  • a freewheeling diode is connected, which is connected to a second node in front of the magnetic coil, in the supply line of the magnetic coil and the freewheeling diode in the direction of the first is switched to the second node conductive.
  • a freewheeling diode is particularly favorable in the pulse width-modulated operation.
  • An electromagnet requires more energy for the suit of the anchor than for the holding state of the anchor. It is therefore often sufficient in many applications to reduce the power consumption of the electromagnet after the anchor suit, for example by the use of a pulse width modulation drive. For a pulse width modulation operation, in turn, the freewheeling diode is needed. Such an embodiment therefore leads to a correspondingly lower energy consumption.
  • a pulse width modulation switching element is provided in front of the second node.
  • the evaluation unit acts on the switching element and this opens for Ankerlagebeées.
  • the evaluation unit which is designed for example as a microcontroller, thus simultaneously controls the switching element.
  • the proposal includes both variants.
  • TVS diode Transient Voltage Suppressor Diode
  • the proposed TVS diode can be implemented, for example, as a discrete, individual component or, for example, integrated into the switching element realized as a MOSFET.
  • the invention also includes an electromagnet equipped with a device as described.
  • the electromagnet is embodied, for example, as a lifting magnet, the electromagnet comprising an armature chamber receiving at least one magnet coil, which accommodates an armature, and the magnetic field generated by the current-carrying magnet coil acts on the armature.
  • this is not limited to the arrangement of a magnetic coil, but there are also known electromagnets, a second or have multiple magnetic coils, all of which act basically the same, namely act with appropriate current to the armature, for example, for positioning or holding purposes.
  • electromagnets a second or have multiple magnetic coils, all of which act basically the same, namely act with appropriate current to the armature, for example, for positioning or holding purposes.
  • additional solenoid / n can then while they are not energized to move or fix the object / armature, that is turned off / are used for sensor problems.
  • the advantage lies in the fact that the currently used magnetic coil, which exerts a corresponding holding force on the armature, must not be affected during operation.
  • the electromagnet is designed as a magnet and thereby the solenoid has a current acted upon solenoid coil.
  • the magnet is operable in different modes.
  • adhesive magnets known which have at least one permanent magnet and the magnetic field generated by the magnetic coil of the at least partial compensation of the magnetic field of the permanent magnet is used.
  • As a result as complete as possible compensation of the magnetic field of the permanent magnet is achieved by switching on the magnetic field of the magnetic coil, depending on the application, but the invention is not limited thereto.
  • the advantage of using a permanent magnet in an adhesive magnet is that a powerless holding the object is possible.
  • the magnetic field generated by the energized magnetic coil of the holding magnet serves to hold the object.
  • the current-carrying magnetic coil generates a magnetic field through which a force acts on the object or armature, in particular against the force of a return device, such as a spring or other passive or active device (for example, elastic member, additional electromagnetic drive) is directed.
  • a return device such as a spring or other passive or active device (for example, elastic member, additional electromagnetic drive) is directed.
  • the device 1 is particularly in Fig. 1a respectively Fig. 1b shown schematically.
  • a magnetic coil 2 is supplied via a feed line 3 and a lead 4 with electric current. At her is thus a supply voltage.
  • a switching element S 1st In the position shown here, the first current-carrying magnet coil 2 is just separated from the supply voltage, the switching element S 1 is open.
  • the magnetic coil 2 generates a voltage pulse U i whose time course is dependent on the coil inductance, which in turn is dependent on the position of the armature in the armature space or electromagnet.
  • the voltage pulse U I is recorded in the evaluation unit 5 and evaluated.
  • the recorded by the evaluation unit 5 voltage pulse U I detects the voltage across the open switching element S 1 to earth, for example, drops.
  • the various strategies and algorithms that can be evaluated are described below in particular with the Fig. 2 to 5 to be discribed. This is the simplest embodiment of the invention.
  • a current measuring device 6 is provided which is connected via a current measuring line to a separate input of the evaluation unit 5.
  • the embodiment of the current measuring device 6 is very variable.
  • An inexpensive and comparatively accurate method is the use of a shunt resistor 60.
  • the use of the shunt resistor 60 is disclosed in US Pat Fig. 1b shown. With a closed switching element S 1, a current flow exactly proportional measurement voltage is dropped across the shunt resistor 60th With this configuration, it is easily possible to measure the coil current with the evaluation unit 5 with the evaluation unit 5 shortly before the time of opening of the switching element S 1 .
  • the arrow 50 is indicated that the evaluation unit 5 acts on the switching element S 1 and this opens or closes.
  • the switching element S 1 as a transistor, for example as Mosfet or the like, designed.
  • the evaluation unit 5 also simultaneously assumes tasks of a measurement control, that is to say the switching element S 1 is actuated by the evaluation unit 5. During a relatively short period of time, the switching element S 1 is opened and then, instead of the measuring voltage in the evaluation unit 5, the voltage pulse U I recorded.
  • Fig. 2 describes the basic behavior and the principal characteristic, which results with the use of the method according to the invention.
  • t-diagram two voltage curves for two different armature positions and M 2 are shown one above the other.
  • Two time points are marked on the time (t) axis, namely the start time t A and the end time t E.
  • the start time t A and the end time t E define the time period [t A ; t E ].
  • the switching element S 1 is open. Before the start time t A and after the end time t E , the switching element S 1 is closed.
  • Another characteristic information is the height of the voltage end value U 1 or U 2 at the end time t E. It is easy to see that in the anchor position M 1 there is a higher voltage end value U 1 , as in the other, second armature position M 2 .
  • the algorithm which is carried out in the evaluation unit 5, now compares the voltage value measured at the end time t E in a table of reference values which are correlated or parameterized with the corresponding anchor position.
  • Fig. 2 considered the slope of the voltage waveform at a specific time t d , which is described for example in the armature position M 1 (for example, in a measured voltage pulse U I ) as d I and differs from the slope of the reference voltage waveform U R after the armature position M 2 .
  • corresponding reference values of the derivatives are stored, for example at a specific measurement time t d , and the evaluation unit 5 determines the slope of the tangent or the voltage profile in the respective time.
  • This "slope" table is in turn referenced to the respective anchor position and by comparing the measured with the reference value, the situation can be determined.
  • the tU diagram shown here shows two variants, namely the voltage curve, which is drawn with a solid line, and the voltage curve, which is shown dotted.
  • the latter follows basically from the initial time t A , after a strong increase, an exponential decay of both the reference voltage U R and the voltage pulse U I.
  • the characteristic curve shown with a solid line is that with a protective circuit. This can be achieved for example by the use of a TVS diode, or suppressor diode, or a varistor.
  • the example carried out here shows within the time period [t A ; t E ] a smaller time window [t 1 ; t 2 ], within which a voltage pulse U I is sampled.
  • the voltage level of the voltage pulse U I can be sampled and evaluated and then closed on the position of the armature.
  • the course of the slope or the voltage difference or the temporal voltage change over the time window [t 1 ; t 2] characteristic for the respective Location of the anchor.
  • Fig. 4 another evaluation option is shown.
  • the time duration ⁇ t is determined until the voltage pulse U I falls below a switching threshold U S later than the reference voltage U R.
  • this can also be related to the starting time t A. By calculating or comparing this time is then close to the position of the armature in the electromagnet.
  • a differential method in which the voltage pulse U i is derived according to time so as to determine the position of the armature, it is alternatively also provided to use an integrative or integral evaluation option.
  • the area A describes the area between the voltage pulse U I and the reference voltage U R within the time period [t A ; t E].
  • the size of this surface which has been formed by integral formation over time, is a measure of the determination of the anchorage.
  • this differential measurement it is also possible to determine the entire area below the voltage pulse U I. From the area A is closed to the position of the anchor.

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
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Claims (15)

  1. Procédé de détermination de la position d'un objet, à indiquer sous la forme d'une distance, par rapport à une bobine magnétique (2) d'un électroaimant, dans lequel l'électroaimant comporte la bobine magnétique (2) qui peut être traversée par un courant, et un champ magnétique, généré par la bobine magnétique (2) traversée par le courant, agissant sur l'objet, dans lequel un élément de commutation commandable (S1) est disposé dans une ligne d'entrée ou de sortie (3, 4) de la bobine magnétique (2), lequel élément de commutation permet de séparer la bobine magnétique (2), traversée par un courant, d'une tension d'alimentation pendant un intervalle de temps ([tA ; tE), de sorte que la bobine magnétique (2) génère une impulsion de tension (UI) dont la variation dans le temps dépend de la position de l'objet par rapport à la bobine magnétique (2) et cette variation dans le temps de l'impulsion de tension (UI) est amenée à une unité d'évaluation (5) pour déterminer la position de l'objet dans l'électroaimant.
  2. Procédé selon la revendication 1, dans lequel l'objet est un induit et le procédé est utilisé pour déterminer la position de l'induit dans l'électroaimant, dans lequel l'électroaimant comprend un espace entouré au moins partiellement par la bobine magnétique (2) et le champ magnétique généré par la bobine magnétique (2), traversée par le courant, agit sur l'induit, dans lequel l'élément de commutation commandable (S1) est disposé dans la ligne d'entrée ou de sortie (3, 4), lequel élément de commutation permet de séparer la bobine magnétique (2), traversée par un courant, d'une tension d'alimentation pendant un intervalle de temps ([tA ; tE), de sorte que la bobine magnétique (2) génère une impulsion de tension (UI) dont la variation dans le temps dépend de la position de l'objet par rapport à la bobine magnétique (2) et cette variation dans le temps de l'impulsion de tension (UI) est amenée à une unité d'évaluation (5) pour déterminer la position de l'objet dans l'électroaimant.
  3. Procédé selon la revendication 1 ou 2, dans lequel un dispositif de mesure de courant (6) mesure le courant dans la bobine peu de temps avant que la tension d'alimentation ne soit séparée de la bobine magnétique (2)et amène cette valeur de mesure à l'unité d'évaluation (5) et/ou effectue une comparaison des caractéristiques de chute de l'impulsion de tension (UI) avec des courbes de référence ou des valeurs de référence mémorisées dans l'unité d'évaluation (5) et correspondant (UR) à la position de l'objet ou de l'induit et une détermination de la position de l'objet ou de l'induit à partir de cette comparaison.
  4. Procédé selon l'une des revendications précédentes, dans lequel on mesure le niveau de tension de l'impulsion de tension (UI) dans l'unité d'évaluation (5) à la fin de l'intervalle de temps ([tA ; tE]) et on détermine à partir de là la position de l'objet ou de l'induit et/ou l'unité d'évaluation (5) mesure dans une fenêtre de temps ([t1 ; t2]), qui se trouve dans l'intervalle de temps ([tA ; tE]), la variation et/ou l'intensité de l'impulsion de tension (UI) et détermine à partir de là la position de l'objet ou de l'induit et/ou un seuil de commutation (Us) est prévu et l'unité d'évaluation (5) détermine le temps jusqu'à ce que la variation de l'impulsion de tension (UI) chute sous le seuil de commutation (US) et détermine à partir de là la position de l'objet ou de l'induit et/ou l'unité d'évaluation (5) détermine la surface (A) entre la variation de tension de référence (UR) et l'impulsion de tension (UI) ou la surface au-dessous de l'impulsion de tension (UI) et détermine à partir de là la position de l'objet ou de l'induit et/ou l'unité d'évaluation (5) détermine la variation de la pente (dI) de l'impulsion de tension (UI) et détermine à partir de là la position de l'objet ou de l'induit (5).
  5. Procédé selon l'une des revendications précédentes, dans lequel l'intervalle de temps ([tA ; tE) est plus petit, en particulier au moins dix fois plus petit, que la durée du processus de commutation ou d'alimentation en courant, notamment l'alimentation en courant de la bobine magnétique (2) de l'électroaimant étant effectuée pendant un certain temps et le champ magnétique, généré par la bobine magnétique (2), servant à positionner ou déplacer l'objet ou l'induit ou à compenser au moins partiellement le champ magnétique d'un aimant permanent.
  6. Procédé selon l'une des revendications précédentes, dans lequel l'intervalle de temps ([tA ; tE]) est plus petit, en particulier au moins dix fois plus petit, que la durée du processus de commutation de l'électroaimant.
  7. Procédé selon l'une des revendications précédentes, dans lequel l'intervalle de temps {[tA ; tE]) se situe pendant la durée ou l'intervalle de temps ([tA ; tE]) se situe en dehors de la durée.
  8. Dispositif muni d'une bobine magnétique (2) destiné à déterminer la position d'un objet, à indiquer sous la forme d'une distance, par rapport à la bobine magnétique (2) pour un électroaimant, l'électroaimant pouvant comporter la bobine magnétique (2), qui peut être traversée par un courant, et un champ magnétique, qui peut être généré par la bobine magnétique (2) traversée par un courant, agissant sur l'objet et le dispositif comportant un élément de commutation commandable (S1) qui est disposé dans une ligne d'entrée ou de sortie (3, 4) de la bobine magnétique (2) et le dispositif (1) comportant une unité d'évaluation (5) qui évalue une impulsion de tension (UI) qui est générée pendant l'intervalle de temps ([tA ; tE]) pendant lequel la bobine magnétique (2), traversée par un courant, est séparée d'une tension d'alimentation.
  9. Dispositif selon la revendication 8, dans lequel l'objet est un induit de l'électroaimant et le dispositif sert à déterminer la position de l'induit dans l'électroaimant, l'électroaimant comportant un espace qui reçoit l'induit et qui est entouré au moins partiellement par la bobine magnétique (2) et le champ magnétique, qui peut être généré par la bobine magnétique (2) qui peut être traversée par un courant, pouvant agir sur l'induit, et le dispositif (1) comportant l'élément de commutation commandable (S1) qui est disposé dans la ligne d'entrée ou de sortie (3, 4) de la bobine magnétique (2) et le dispositif (1) comportant l'unité d'évaluation (5), qui évalue l'impulsion de tension (UI) qui est générée pendant l'intervalle de temps {[tA ; tE) pendant lequel la bobine magnétique (2), traversée par un courant, est séparée de la tension d'alimentation, et/ou du côté sortie, en aval de l'élément de commutation (S1), une diode de roue libre (7) étant raccordée à un premier noeud (40), laquelle est raccordée à un second noeud (30) de la bobine magnétique (2) dans la ligne d'entrée (3) de la bobine magnétique (2) et la diode de roue libre (7) pouvant être commutée dans le sens passant du premier noeud (40) au second noeud (30).
  10. Dispositif selon la revendication 8 ou 9, lequel comprend un circuit de protection des composants du dispositif, par exemple une diode Transil ou une varistance, destiné à protéger les composants contre les surtensions et/ou dans lequel l'unité d'évaluation (5) peut agir sur l'élément de commutation (S1) qui s'ouvre pour déterminer la position de l'induit et/ou la ligne d'entrée (3) de la bobine magnétique (2) contient, en particulier en amont du second noeud (30), un élément de commutation à modulation d'impulsions (S2) et/ou l'élément de commutation (S1) ou l'élément de commutation à modulation de largeur d'impulsion (S2) est réalisé sous la forme d'un transistor à effet de champ et/ou l'unité d'évaluation (5) est conçue comme un microcontrôleur.
  11. Electroaimant, en particulier aimant de levage ou aimant de maintien, comprenant un dispositif (1) selon l'une quelconque des revendications 8 à 10.
  12. Electroaimant selon la revendication 11, l'électroaimant est réalisé sous la forme d'un aimant de levage, l'électroaimant comportant un espace qui reçoit un induit et qui est entouré au moins partiellement par au moins la bobine magnétique (2) et le champ magnétique, qui peut être généré par la bobine magnétique (2) qui peut être traversée par un courant, pouvant agir sur l'induit.
  13. Electroaimant selon la revendication 11 ou 12, l'électroaimant étant conçu sous la forme d'un aimant de maintien et l'électroaimant comportant la bobine magnétique (2) qui peut être alimentée avec du courant, en particulier l'aimant de maintien comportant au moins un aimant permanent et le champ magnétique, qui peut être généré par la bobine magnétique (2), servant à compenser au moins partiellement un champ magnétique de l'aimant permanent.
  14. Electroaimant selon l'une quelconque des revendications 11 à 13, dans lequel le champ magnétique, qui peut être généré par la bobine magnétique (2), alimentée en courant, de l'aimant de maintien sert à maintenir l'objet.
  15. Electroaimant selon l'une des revendications 11 à 14, dans lequel la bobine magnétique (2), qui peut être traversée par un courant, génère le champ magnétique qui permet d'agir sur l'objet/l'induit par le biais d'une une force qui peut s'opposer en particulier à la force d'un dispositif de rappel.
EP12154928.1A 2011-02-18 2012-02-10 Dispositif et procédé de détermination de la position d'un objet sur un électroaimant Active EP2511918B1 (fr)

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DE102011011760 2011-02-18
DE201110102060 DE102011102060A1 (de) 2011-02-18 2011-05-19 Verfahren und Vorrichtung zur Bestimmung der Lage eines Gegenstandes an einem Elektromagneten

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DE102012010868A1 (de) * 2012-05-31 2013-12-05 Avl Deutschland Gmbh Verfahren und Vorrichtung zum Überwachen einer Aktuatorvorrichtung
DE102016121327B4 (de) * 2016-11-08 2019-07-04 Bühler Motor GmbH Vorrichtung und Verfahren zum Steuern einer Haltebremse sowie ein computer-lesbares Medium
FR3065110B1 (fr) * 2017-04-11 2019-04-19 Schneider Electric Industries Sas Procede et dispositif de commande d'un actionneur, et appareil de protection electrique comportant un tel dispositif
DE102019218480A1 (de) * 2019-11-28 2021-08-05 Robert Bosch Gmbh Verfahren zur Ansteuerung eines Magnetventils und Auswerte- und Steuereinheit

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US5198764A (en) * 1991-02-22 1993-03-30 Sentech Corp. Position detector apparatus and method utilizing a transient voltage waveform processor
US5481187A (en) * 1991-11-29 1996-01-02 Caterpillar Inc. Method and apparatus for determining the position of an armature in an electromagnetic actuator
US5712563A (en) * 1994-06-13 1998-01-27 Honda Giken Kogyo Kabushiki Kaisha Steering torque sensor utilizing a displacement detector having a pulse power supply
DE19733138A1 (de) * 1997-07-31 1999-02-04 Fev Motorentech Gmbh & Co Kg Verfahren zur Erkennung der Ankeranlage an einem elektromagnetischen Aktuator
DE19748647C2 (de) * 1997-11-04 2001-09-27 Festo Ag & Co Elektromagnetisches Antriebssystem mit integrierter Wegsignalerzeugung
DE19836769C1 (de) * 1998-08-13 2000-04-13 Siemens Ag Verfahren zum Bestimmen der Position eines Ankers
DE10020896A1 (de) * 2000-04-29 2001-10-31 Lsp Innovative Automotive Sys Verfahren zur Bestimmung der Position eines Ankers/ eines Ventils
DE102005018012A1 (de) 2005-04-18 2006-10-19 Zf Friedrichshafen Ag Sensorlose Positionserkennung in einem elektromagnetischen Aktuator

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