EP1042649A1 - Transducteur de mesure inductif pour trajets et dispositif de mesure des angles - Google Patents

Transducteur de mesure inductif pour trajets et dispositif de mesure des angles

Info

Publication number
EP1042649A1
EP1042649A1 EP98966224A EP98966224A EP1042649A1 EP 1042649 A1 EP1042649 A1 EP 1042649A1 EP 98966224 A EP98966224 A EP 98966224A EP 98966224 A EP98966224 A EP 98966224A EP 1042649 A1 EP1042649 A1 EP 1042649A1
Authority
EP
European Patent Office
Prior art keywords
measuring
core
coil
voltage
air gap
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Withdrawn
Application number
EP98966224A
Other languages
German (de)
English (en)
Inventor
Franz Gleixner
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.)
Horst Siedle GmbH and Co KG
Original Assignee
Horst Siedle GmbH and Co KG
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 Horst Siedle GmbH and Co KG filed Critical Horst Siedle GmbH and Co KG
Publication of EP1042649A1 publication Critical patent/EP1042649A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
    • G01D5/165—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
    • G01D5/2073—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by movement of a single coil with respect to two or more coils

Definitions

  • Inductive transmitter for paths and arrangement for measuring angles
  • An inductive transmitter has a stator and a slidable relative to it with an inductive transmitter element and associated evaluation electronics - the output signal a measure of the position of the slide relative to the stator represents.
  • the stator has an excitation coil which extends over the measuring path and is fed with alternating current, and whose magnetic field flows through a transmitter element connected to the slide in the form of a soft magnetic core and / or a coil, which in turn flows through a secondary winding connected to the stator and there induced a voltage dependent on the position of the carriage.
  • This secondary winding consists of a turn from which partial voltages distributed over the measuring path are obtained by appropriate taps.
  • a voltage is generated which depends on the position of the Sled is dependent.
  • the averaging can be done by resistors or other electrical components. Instead of discrete components, resistance layers or capacitance coatings can also be used.
  • a version in which the excitation winding consists of a single turn is particularly advantageous, the housing and guides serving as a coil.
  • a further improvement results from the design of the transmitter element as an oscillating circuit, as a result of which the formation of stray fields is greatly reduced. It is advantageous if the sensor is operated at the resonance frequency of this resonant circuit by using the resonant circuit as the frequency-determining element of an oscillator.
  • the invention further relates to an arrangement for measuring angles according to the preamble of claims 13, 14 and 16.
  • inductive displacement / angle sensors is the low sensitivity to dirt and other environmental influences.
  • Differential chokes are generally known, in which a soft magnetic core is guided in two coils, which influences the inductance of the two coils by its position so that a position-dependent voltage can be tapped between the two coils connected in series to AC voltage.
  • This construction has the disadvantage that the overall length of the coil is at least twice the measuring path and additionally the mechanical connection of the core in the end position still protrudes around the measuring path, so that an installation length of at least three times the measuring path is required.
  • the measurement result is influenced by the temperature response of the winding resistance and the permeability of the magnetic material used.
  • the object of the invention is to eliminate the disadvantages of the above-mentioned devices and to propose a displacement sensor which can be constructed using simple means and which has a high degree of accuracy.
  • FIG. 2 shows a diagram of the magnetic flux and the voltage curve thereby caused on the measuring winding over the length of the winding
  • 3 shows an embodiment with a single turn as an excitation winding
  • FIG. 6 shows an embodiment with a measuring core with an additional winding and a capacitor for forming an oscillating circuit
  • FIG. 7 is a block diagram of a construction in which the resonance circuit is used as a frequency determining element in an oscillator circuit.
  • FIG. 8 shows a schematic representation of an embodiment in which the measuring voltage is tapped directly at the excitation winding
  • FIG. 10 shows an exemplary embodiment of an angle sensor with a toroidal coil and a measuring core placed outside the fulcrum according to the invention
  • Fig. 11 is an angle sensor with a symmetrical structure
  • Fig. 12 schematically shows an angle sensor with a flat coil according to the invention.
  • Fig. 1 shows a schematic representation of a sensor according to the invention.
  • An excitation winding 1 which extends in its coil area over the length 1 of the sensor, is fed by an AC voltage source 4.
  • a coil core 2 consisting of a material of high permeability and having an air gap d is displaceably guided in such a way that it penetrates the coil 1 and part of the voltage divider element 3 is located in its air gap.
  • the voltage divider element 3 consists of a conductor 5, which extends along the lower edge over the voltage divider element 3, a conductor 8, which extends over the upper edge over the voltage divider element, a further conductor 7, which runs parallel to conductor 5, and a conductive coating 9, which lies between the conductor 8 and the conductor 7, which forms a resistance between the conductors 8 and 7, which is distributed over the measuring section over the surface, and the sum of which is high-impedance with respect to the impedance of the induction loop formed by the conductors 5 and 8.
  • the current supplied by the AC voltage source 4 through the coil 1 generates a magnetic flux, which is conducted in the area of the core 2 via the voltage divider element 3, while the voltage divider element 3 has only a slight flow in the remaining area.
  • FIG. 2 shows an idealized course of the field strength and the voltage over the length of the transmitter. Edge effects and the stray field are not taken into account in the course.
  • a magnetic flux ⁇ occurs in the area of the core, which flows through the resistance element 9.
  • an alternating voltage U (x) is induced in the conductor 8 compared to conductors 5 and 7.
  • the alternating voltage U (x) is proportional to the integral over the magnetic flux ⁇ integrated over the surface.
  • a voltage curve is formed on the conductor 8 relative to the conductor 5 via the position x, which is initially 0 at the position opposite the connections to the core 2 and increases linearly with the area covered by the core 2 and behind the core up to the Connections remains constant (Fig. 2).
  • the conductance coating can be formed as a continuous surface made of resistance material or in the form of a sufficient number of uniformly distributed discrete resistors or of capacitor surfaces or individual capacitors or combinations thereof.
  • the measuring coil Since the measuring coil consists of only one turn, the voltage delivered is relatively low. To obtain a signal that can be used for evaluation, a correspondingly high magnetic flux through the voltage divider element is required, with the stray flux of the primary coil 1 coupling as little as possible into the voltage divider element.
  • the induced voltage is a function of the frequency, the magnetic field strength generated in the primary coil 1, the permeability and the cross section of the core 2, the air gap d of the core 2 and the area of the core in the region of the air gap.
  • the voltage supplied by the voltage source 10 is reduced by the transformer 11 to a correspondingly lower voltage.
  • the secondary winding of the transformer 11 is connected with one connection to the housing 12 and with the other connection to a rail 13 which lies inside the housing 12 parallel to the inner wall and is electrically connected to the housing at the opposite end.
  • the secondary current of the transformer flows via the rail 13 and back via the housing 12.
  • the core 14 which conducts a magnetic flux generated by the current via the rail 13 and housing 12 through the voltage divider element 15.
  • the return line is as wide as possible and is arranged at a short distance from the housing.
  • this arrangement offers the possibility of designing the geometry in such a way that the lowest possible inductance occurs in the area outside the core 14, so that the voltage drop occurs predominantly in the area of the core 14 as a result of its low magnetic resistance.
  • This The arrangement has a resonance frequency which is far above the frequency required for this arrangement.
  • the magnetic fields generated by the excitation winding in the area outside the core 14 induce in the voltage divider a voltage which is added to the path-dependent useful signal induced in the core 14. Initially, this would only cause a zero offset. However, since the permeability of the soft magnetic core material is temperature-dependent, this can lead to a deterioration in the temperature behavior. The voltage induced by the stray field in the voltage divider should therefore be as low as possible.
  • the voltage divider element 15 is shifted into the region of a recess in one of the winding halves
  • FIGs. 4a and 4b A construction is particularly suitable here in which only one turn is provided as the excitation coil.
  • 4a and 4b show a sectional view through a corresponding arrangement.
  • the housing 15 serves as an outgoing conductor and the profile 16 as a return conductor of the excitation current.
  • the profile 16 is designed so that the voltage divider element 17 can be accommodated in a trench-like opening.
  • the core 18 made of a material of high magnetic permeability, the profile 16 encloses, wherein it has an air gap which is arranged in the trench-like opening of the profile, in which in turn the voltage divider element 17 is located.
  • the excitation current preferably flows in the surface area of opposing surfaces.
  • the area of the trench-like opening is largely field-free, provided that the magnetic flux is not influenced by the core.
  • the field lines preferably follow the core 18 because of the high permeability of the core 18 and predominantly pass through the voltage divider element 17 in the area of the air gap in order to induce the desired voltage there. Because of the lower magnetic resistance, the magnetic flux is higher than in the region without a core 18. Stray fields also occur here, which lead to a reduction in the output signal. However, these are always in the same ratio to the useful field.
  • An advantage of this arrangement is that the inductance of the primary winding is very low in the area outside the core 18, while it is relatively high in the area of the magnetic core 18. As a result, only a small voltage drop occurs at the field winding in the area outside the measuring core.
  • the structure is very rigid due to the shape of the profile, which provides good mechanical stability.
  • the complex design of the core 18 is disadvantageous.
  • the voltage divider element is arranged so that the unwanted stray fields cancel each other (Fig. 5a and Fig. 5b).
  • return conductors 20 are arranged opposite the voltage divider element in such a way that the magnetic field lines flood the voltage divider element in the absence of a core in such a way that the integral of the magnetic flux over the surface of the voltage divider element becomes zero (FIG. 5a), insofar as it is not formed in the area of the core 22.
  • 5b shows the area of the core 22 where the flux is deflected such that the magnetic flux only passes through the voltage divider element 21 in one direction and thereby induces a corresponding voltage in the measuring winding.
  • the output voltage is relatively low. With the sizes used, cross sections for the core of approximately 0.5 cm ⁇ with an air gap of 2 mm can be achieved. It is desirable to have an operating frequency in the range of approximately 100 kHz and an output voltage of at least 0.1 volts. (Lower voltages still give usable results. However, the evaluation of the output voltage then becomes more complex and the influence of the noise becomes noticeable with high accuracy requirements.) The excitation current required for the flooding can thus be estimated. The result is a value of approx. 5 A. This requires the transformer and the forward and return lines to be designed accordingly. The current can be reduced by increasing the frequency, reducing the air gap and increasing the air gap area.
  • the supply becomes complex due to the voltage drops that arise.
  • the high feed current creates a relatively strong unwanted stray field. It is therefore desirable to concentrate the excitation current in the area of the measuring core. As shown in FIG. 6, this is possible if the measuring core 23 is provided with a winding 24 which is connected to a capacitor 25.
  • the inductance of the coil and the capacitance result in an oscillating circuit which is excited by the excitation current Jg.
  • the current JLO flows in the resonant circuit and multiplied by the number of turns of the coil generates a corresponding magnetic field strength in the air gap of the core 23. If the resonant circuit is operated at its resonant frequency, the
  • the excitation current Jg flows through a conductor 27 through the core.
  • the voltage induced in the measuring winding 26 is mainly determined by the current ⁇ Q flowing through the winding 24 and the capacitor 25.
  • the excitation current Jg is 90 ° out of phase with the resonant circuit current JLC when the resonant circuit is in resonance. This further reduces the influence of the stray field.
  • FIG. 7 shows the block diagram of an arrangement which uses the resonant circuit formed from the core 30, coil 31 and capacitor 32 as the frequency-determining element.
  • the resonance frequency means that the current and voltage are in phase, and the voltage reaches a maximum.
  • the circuit oscillates at the frequency of the resonant circuit formed by the coil 31 and capacitor 32.
  • the ratio of the voltages between the output of the voltage summer 41 and the entire secondary winding 34 is used as a measure of the position of the core relative to the stator. It is expedient to regulate the voltage on the secondary winding 34 to a constant value by rectifying them compares with a rectifier circuit 38 with a reference voltage UR from the voltage source 40 and regulates the difference to zero by controller 41 by adjusting the oscillator amplitude by influencing the loop gain of the oscillator circuit so that it oscillates with the required amplitude.
  • This method has the advantage that the oscillator circuit is not limited if the dimensions are suitable and therefore has a very low harmonic content.
  • the transmitter has as few connections as possible, e.g. B. if they are to be passed through isolated container walls.
  • the necessary number of connections can be reduced if the voltage applied to the supply line is evaluated.
  • 8 shows an example of such an embodiment.
  • the AC voltage source 48 feeds a conductor loop, which consists of conductors 43 and 44, via a transformer 42. Egg- ner of the two conductors leads through the displaceable core 45.
  • the resistance layer 46 is connected to the conductor 43 and is connected to the conductor 47 on the opposite side.
  • the dimensioning is designed in such a way that the voltage drop along the conductor 43 in the area without the core 45 is small compared to the voltage drop in the area of the core 45.
  • An embodiment of the core 45 as an oscillating circuit which is operated at the resonance frequency is particularly advantageous.
  • the voltage curve on the conductor 43 is summed by the resistance element 46 and output via the conductor 47.
  • the problem with this construction is that the voltage drops on conductors 43 and 44 caused by the supply current of the transmitter are included in the output voltage. This manifests itself in a zero point shift and a reduction in the output signal. If necessary, compensation can be provided by a current-dependent correction voltage.
  • Inductive transducers designed as angle sensors are described below.
  • the best relates to an angle sensor with a ring coil.
  • An arrangement with a toroidal coil which is concentric to the pivot point of the measuring shaft is particularly advantageous for measuring ranges above 90 °.
  • an arrangement with a measuring core placed on the measuring shaft at the fulcrum and an eccentrically (outside the fulcrum) measuring core with a continuous measuring shaft (hollow shaft) is to be distinguished.
  • a concentric toroid is required wherever the angle of rotation is not limited.
  • FIG. 9 shows an angle sensor with a ring coil and a measuring core placed in the fulcrum for a measuring range of approx. 90 °.
  • a measuring core l ⁇ consists of two ferrite cores of the same type, which form a yoke from the ring-shaped center piece, the adjoining rectangular web and the adjoining ring segments, which face each other with an air gap d.
  • the measuring core 1 is mechanically connected to a shaft 200 ⁇ , the angle of which is to be measured with respect to a fixed measuring element 3 ⁇ .
  • the fixed measuring element 3 ⁇ lies between the two core halves.
  • an electrically conductive path 4 ⁇ is applied in the form of a conductor loop, which is connected at the ends to connections 5 ⁇ and 6 ⁇ .
  • This conductor loop is made of arcs 7 and 8 ⁇ and the connections among themselves and to the connections 5 ⁇ and 6 ⁇ .
  • Another conductor 9 ⁇ in the form of an arc is connected to a terminal 10.
  • a resistance layer 11 is applied between the conductor tracks 7 ⁇ and 9 ⁇ on the carrier plate.
  • An annular coil 12 ⁇ which, like the carrier plate 2, is also arranged on the carrier plate 2 is arranged between the two core halves of the measuring core l ⁇ .
  • this coil is arranged as close as possible to the measuring core and arranged, for example, as a solenoid.
  • the inner core diameter and the coil diameter must be limited to the necessary amount.
  • the coil is led to electrical connections 13 ⁇ and 14 ⁇ .
  • a capacitor 15 is placed parallel to the coil ⁇ .
  • the structure can be symmetrical for measuring angles of less than 180 °.
  • the measuring core then has two pairs of legs offset by 180 °, which are fed by a common toroid, and act on correspondingly arranged measuring loops, each with a resistance element.
  • a shaft 32 is rotatably mounted in a housing 30.
  • a soft magnetic core 33 ⁇ is attached to the shaft 32.
  • the core 33 ⁇ consists of a cylindrical central part 34 'and four legs 35 extending therefrom, each of which is opposed by a pair at an angle of 180 °.
  • the individual leg pairs 35 ⁇ form an air gap in which a circuit board 31 ⁇ lies.
  • the circuit board 31 has a similar structure to the circuit board 2 ⁇ of the embodiment described above in connection with FIG. 9.
  • the resistance layer and electrical connections 36 it also has a second arrangement 37 ⁇ of conductor tracks, resistance elements ment and electrical connections.
  • An exciting coil is ⁇ 38 traversed by an alternating current which produces an approximately equal magnetic flux in the two air gaps.
  • the output voltages of the two resistance elements 36 and 37 ⁇ are evaluated so that they contribute to the measurement result in the same way. If an axis offset occurs, the output voltage of one part 36 ⁇ will have an error. However, this is largely offset 37 x by a corresponding opposite error of the other part.
  • Another advantage is that there is no imbalance due to the symmetrical structure.
  • a core 17 is laterally attached to a shaft 18 x with a relatively large diameter by means of a carrier 19.
  • the core 17 ⁇ consists of soft magnetic material. It is formed from two halves of the same type, each consisting of an inner and an outer ring segment and an intermediate connecting web, which are connected to one another on the shaft side without an air gap.
  • a short-circuit ring 20 Between the core and the shaft is a short-circuit ring 20, which lies in the area outside the core 17 ⁇ on the circumference of the carrier body 19 ⁇ , but is guided in the area of the core between the core 17 x and the shaft 18 ⁇ . With the inner sides of the outer ring segments of the core 17 ⁇ , this forms an air gap in which the carrier plate 16 ⁇ lies.
  • a solenoid 30 is arranged, which surrounds the shaft 18, the carrier body 19, the inner ring segment of the core 17 v and a short-circuit ring 20 ⁇ at a short distance.
  • a conductor loop 21 with connections 26 and 24, a conductor track 22 v with a connection 25, a resistance track 23, coil connections 27 y and 28 and a resonant circuit capacitor 29 ⁇ is also arranged.
  • the core 17 ⁇ forms a relatively low magnetic resistance due to the high relative permeability factor of its material and the short air gap.
  • a magnetic flux preferably forms through the region of the air gap.
  • the spool 20 x has a large diameter and also the shaft shows an undefined magnetic behavior, will be without the short-circuit ring 20 ⁇ form a stray field.
  • a voltage is induced in the short-circuit ring 20, which causes a current flow against the excitation current I E. This forms a magnetic field which is opposite to the magnetic field of the coil, so that the resulting magnetic field is greatly weakened.
  • the excitation coil is fixed and is fed directly by the oscillator. Together with a capacitor, it forms a resonant circuit.
  • the excitation coil flows through the measuring core, which is mechanically connected to the shaft, the angle of which is to be measured relative to the housing, via an arm.
  • the measuring core in turn floods the already known measuring loop with the resistance layer and thus generates an angle-dependent output signal.
  • FIG. 12 shows a schematic illustration of an embodiment of an angle sensor according to the functional principle described above.
  • a shaft 41 is mounted ⁇ ⁇ rotatable.
  • An arm 42 is firmly connected to the shaft.
  • a soft magnetic core 43 ⁇ is attached, which when the shaft rotates, describes a circular arc.
  • the core 43 forms a rectangle which is interrupted by an air gap.
  • a coil 45 ⁇ and a circuit board 44 ⁇ are firmly connected to the housing.
  • the coil 45 ⁇ is arranged so that the straight leg of the measuring core 43 ⁇ passes through it.
  • the circuit board 44 is in the air gap of the measuring core 43 ⁇ .
  • the coil has the smallest possible cross-section so that the leakage flux which flows through the measuring loop outside the measuring core remains as small as possible.
  • the winding is so flat that it can be passed through the air gap of the core 43 ⁇ . This makes it possible to use a one-piece core.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Transducteur de mesure inductif pour la détermination de la position d'un corps susceptible de se déplacer par rapport à un boîtier fixe, caractérisé en ce que le corps mobile présente un transducteur de mesure générant un champ alternatif magnétique s'étendant dans un domaine limité, et en ce que ledit champ alternatif traverse au moins une boucle de conducteur connectée au boîtier et s'étendant sur la longueur de mesure, la différence de potentiel entre les lignes d'amenée et de retour étant prise en moyenne par un circuit électrique et transmise à une sortie. L'utilisation dudit transducteur de mesure inductif porte sur un dispositif pour la mesure des angles entre un boîtier fixe et un arbre.
EP98966224A 1997-12-23 1998-12-21 Transducteur de mesure inductif pour trajets et dispositif de mesure des angles Withdrawn EP1042649A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19757689A DE19757689C2 (de) 1997-12-23 1997-12-23 Induktiver Meßumformer für Wege
DE19757689 1997-12-23
PCT/DE1998/003753 WO1999034170A1 (fr) 1997-12-23 1998-12-21 Transducteur de mesure inductif pour trajets et dispositif de mesure des angles

Publications (1)

Publication Number Publication Date
EP1042649A1 true EP1042649A1 (fr) 2000-10-11

Family

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Application Number Title Priority Date Filing Date
EP98966224A Withdrawn EP1042649A1 (fr) 1997-12-23 1998-12-21 Transducteur de mesure inductif pour trajets et dispositif de mesure des angles

Country Status (6)

Country Link
US (1) US6504361B1 (fr)
EP (1) EP1042649A1 (fr)
JP (1) JP2002500344A (fr)
CN (1) CN1285036A (fr)
DE (1) DE19757689C2 (fr)
WO (1) WO1999034170A1 (fr)

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Publication number Publication date
WO1999034170A1 (fr) 1999-07-08
CN1285036A (zh) 2001-02-21
JP2002500344A (ja) 2002-01-08
DE19757689C2 (de) 2001-02-15
DE19757689A1 (de) 1999-07-08
US6504361B1 (en) 2003-01-07

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