EP0490904A1 - Dispositif de mesure pour la saisie d'une course ou d'un angle de rotation - Google Patents

Dispositif de mesure pour la saisie d'une course ou d'un angle de rotation

Info

Publication number
EP0490904A1
EP0490904A1 EP19900911782 EP90911782A EP0490904A1 EP 0490904 A1 EP0490904 A1 EP 0490904A1 EP 19900911782 EP19900911782 EP 19900911782 EP 90911782 A EP90911782 A EP 90911782A EP 0490904 A1 EP0490904 A1 EP 0490904A1
Authority
EP
European Patent Office
Prior art keywords
coil
sleeve
coils
ferromagnetic material
core
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Withdrawn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
EP19900911782
Other languages
German (de)
English (en)
Inventor
Klaus Dobler
Hanjörg HACHTEL
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0490904A1 publication Critical patent/EP0490904A1/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Withdrawn legal-status Critical Current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
    • G01D5/20—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
    • G01D5/22—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 differentially influencing two coils
    • G01D5/2208—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 differentially influencing two coils by influencing the self-induction of the coils

Definitions

  • the invention relates to a device for detecting a path or an angle of rotation according to the preamble of the main claim.
  • a movable measuring element is moved relative to two measuring coils arranged coaxially with the measuring element.
  • the overlap ratio between the one coil and the measuring element is increased by the movement of the measuring element, while it is reduced by the same amount between the other coil and the measuring element.
  • This device has a relatively large overall length, although only a relatively short measuring path can be detected.
  • the device according to the invention with the characterizing features of the main claim has the advantage that it is very compact and has a relatively small axial length.
  • a high measurement signal can be achieved with the ferromagnetic effect. Due to the opposite change in the coil inductances during the measuring process, the measuring effects of the coils are added while occurring measurement errors of the individual coils often largely compensate each other.
  • the measurement signal has a low temperature drift.
  • Figures 1 to 3 each show a longitudinal section through a modification of a measuring device.
  • 10 denotes a measuring device which has a holder 11 with a cylindrical core 12 made of ferromagnetic material and a sleeve 13 made of non-ferromagnetic but electrically conductive material.
  • the axes of the core 12 and the sleeve 13 run parallel to one another.
  • a second sleeve 16 serving as a coil former and a cylindrical second core 17 serving as a coil former are fastened to a second holder 15.
  • the sleeve 16 and the core 17 are preferably made of non-electrically conductive material.
  • the axes of the core 17 and the sleeve 13 as well as the core 12 and the sleeve 16 are each designed with the same axis, so that the core 12 can dip into the sleeve 16 and the core 17 into the sleeve 13, respectively.
  • a coil 19, 20 through which an alternating current flows is arranged on the core 17 and on the outer wall of the sleeve 16.
  • a measurement object 21, the movement of which is to be determined, is attached to the holder 11, only indicated in FIG. 1.
  • the holder 15 is then stationary arranged. However, it is also possible to fasten the measurement object in reverse, ie the measurement object is arranged on the holder 15 and the holder 11 is stationary.
  • a measurement object can also be attached to each holder 11 or 15, so that the two holders 11, 15 move relative to one another and the difference between the two movements is determined.
  • the magnetic alternating field of the coil 19 through which an alternating current flows detects the surface of the core 12 consisting of ferromagnetic material.
  • the ferromagnetic effect results in the increasing depth of penetration of the core 12 into the coil 19 Inductance increase of the coil 19 described, due to the ferromagnetic nature of the core material. With ferromagnetic material, both the ferromagnetic effect and the eddy current effect act. While, as stated above, the eddy current effect causes a reduction in the inductance of the coil, the ferromagnetic effect causes an increase in the inductance of the coil.
  • the parameters eg material properties of the core 12, the level of the frequency of the alternating current flowing through the coil 19
  • the change in the inductance of the coil 19 is thus in turn a measure of the relative movement of the Core 12 opposite the coil 19.
  • the core 12 and the sleeve 13 simultaneously exert the same movement, so that the inductance of the two coils 19, 20 changes in opposition, that is, the inductance of the coil 20 is reduced, while the inductance of the Coil 19 is increased.
  • Both coils 19, 20 can be interconnected in the so-called "half-bridge circuit" shown in FIG.
  • the coil 20a is arranged on a core 25 fastened approximately centrally to the holder 11a.
  • the core 25 is surrounded by a sleeve 26 on which the coil 19a is located.
  • a ring 27 is arranged in the holder 11a between the sleeve 26 and the core 25.
  • a sleeve 28 fastened to the holder 15a can be moved between the sleeve 26 and the core 25.
  • the sleeve 28 has an outer part 29 made of ferromagnetic material and an inner part 30 made of non-ferromagnetic but electrically conductive material.
  • the sleeve 28, the sleeve 26 and the core 25 are of the same axis.
  • the mode of operation of the training example according to FIG. 2 corresponds to that according to FIG. 1. However, the smaller size in the radial direction and the central arrangement of the components are particularly advantageous.
  • the coil bodies for the coils 19b and 20b are designed as sleeves 35, 36 fastened in the carrier 15b. Both sleeves 35, 36 are coaxially, the sleeve 35 engages around the sleeve 36. The distance between the two sleeves 35, 36 is to be made so large that the magnetic fields of the coils influence each other slightly in relation to the measurement effect.
  • a core 37 made of ferromagnetic material projects into the sleeve 36.
  • a sleeve 38 made of non-ferromagnetic but electrically conductive material extends over the sleeve 35.
  • the sleeve 38 and the core 37 are fastened in the holder 11b by means of the ring 27b and are arranged coaxially with the sleeves 35, 36.
  • the evaluation of the change in inductance of the two coils 19 and 20 can be carried out in the "half-bridge circuit 39" shown in FIG. 4a.
  • the two coils 19, 20 are in one Wheatstone's "half-bridge circuit", that is, connected in a bridge with two "active" bridge branches 19, 20 and the passive bridge branches 40, 41.
  • a Wheatstone "full bridge” instead of a half bridge, as shown in FIG. 4b, for evaluation.
  • the two additional sensor coils required for this should preferably be constructed identically to the two coils of the Wheatstone half-bridge shown in FIG. 4a.
  • the coils 19d and 20d are then z. B. additionally arranged axially parallel.
  • the Wheatstone bridge circuit instead of directly evaluating the coil inductance values, it is also possible to anticipate the change in the respective coil AC resistances, since these depend on the size of the respective coil inductances.
  • a capacitor can be attached in parallel to each sensor coil.
  • the "active bridge branches" consist of parallel resonant circuits, the resistance of which also depends on the respective coil AC current resistances.
  • a further evaluation device 42 for determining the change in inductance of the coils 19, 20 is shown in FIG.
  • the two coils 19, 20 are connected in series with one or two capacitors 43 in a resonant circuit.
  • the coils 19 and 20 can be switched on to the resonant circuit alternately with the help of the switch 44.
  • the change in the oscillation period of the respective resonant circuit depends on the change in the respective coil inductance.
  • the different natural oscillation period of the oscillating circuits then serves as the measuring effect.
  • both linear and radial movements can be determined.

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

Dans un dispositif de mesure (10) pour la détermination de la course ou de l'angle de rotation d'un élément de machine (21), une bobine (19) est disposée sur une carcasse en forme de douille (16) et une bobine (20) est disposée sur une carcasse en forme de cylindre (17). La douille (16) et le noyau (17) se trouvent sur un support (15). Le noyau (17) s'emboîte dans une douille (13) en matériau non ferromagnétique, mais électriquement conducteur. En outre, la douille (16) est guidée sur un noyau (12) en matériau ferromagnétique. Pour cela, la carcasse de bobine (16) et le noyau (12) ainsi que la carcasse de bobine (17) et la douille (13) sont coaxiaux. En raison de l'effet tourbillonnaire, l'inductance dans la bobine (20) est diminuée, tandis qu'en raison de l'effet ferromagnétique, l'inductance dans la bobine (19) est augmentée. Grâce à une connexion des bobines (19, 20) dans un circuit d'évaluation, il est possible d'éliminer partiellement les erreurs de mesures et de renforcer le signal de mesure.
EP19900911782 1989-09-07 1990-08-07 Dispositif de mesure pour la saisie d'une course ou d'un angle de rotation Withdrawn EP0490904A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893929681 DE3929681A1 (de) 1989-09-07 1989-09-07 Messeinrichtung zur erfassung eines wegs oder eines drehwinkels
DE3929681 1989-09-07

Publications (1)

Publication Number Publication Date
EP0490904A1 true EP0490904A1 (fr) 1992-06-24

Family

ID=6388790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900911782 Withdrawn EP0490904A1 (fr) 1989-09-07 1990-08-07 Dispositif de mesure pour la saisie d'une course ou d'un angle de rotation

Country Status (5)

Country Link
EP (1) EP0490904A1 (fr)
CS (1) CS429890A3 (fr)
DE (1) DE3929681A1 (fr)
WO (1) WO1991003709A1 (fr)
YU (1) YU158090A (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4120643B4 (de) * 1991-06-22 2004-04-08 Zf Sachs Ag Reibungskupplung mit Wegsensor
RU2127865C1 (ru) * 1997-07-24 1999-03-20 Медников Феликс Матвеевич Устройство для измерения линейных перемещений (варианты)
DE19804414C2 (de) * 1998-02-05 2000-08-24 Micro Epsilon Messtechnik Induktiver Weg-Sensor
DE19806529C2 (de) * 1998-02-17 2002-04-18 Micro Epsilon Messtechnik Weg-Winkel-Sensor
JP2001074006A (ja) * 1999-09-03 2001-03-23 Amitec:Kk ストロークセンサ
DE10039619B4 (de) * 1999-09-27 2004-07-01 Detra S.A. Induktiver Näherungssensor mit Schwingkreis
DE10047939C2 (de) * 2000-09-27 2003-04-30 Vogt Electronic Ag Induktiver Weggeber
DE102005018797A1 (de) * 2005-04-22 2006-10-26 Bosch Rexroth Ag Wegsensor und Ventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891918A (en) * 1971-03-23 1975-06-24 James F Ellis Linear displacement transducer utilizing an oscillator whose average period varies as a linear function of the displacement
US4091234A (en) * 1977-03-30 1978-05-23 Atari, Inc. Joystick with attached circuit elements
JPS5525251U (fr) * 1978-08-05 1980-02-19
DE3514154A1 (de) * 1985-04-19 1986-10-23 Robert Bosch Gmbh, 7000 Stuttgart Beruehrungsfreies messverfahren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9103709A1 *

Also Published As

Publication number Publication date
YU158090A (sh) 1994-01-20
CS429890A3 (en) 1992-06-17
WO1991003709A1 (fr) 1991-03-21
DE3929681A1 (de) 1991-03-14

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