EP1068490A1 - Dispositif de mesure pour determiner sans contact un angle de rotation - Google Patents

Dispositif de mesure pour determiner sans contact un angle de rotation

Info

Publication number
EP1068490A1
EP1068490A1 EP98958812A EP98958812A EP1068490A1 EP 1068490 A1 EP1068490 A1 EP 1068490A1 EP 98958812 A EP98958812 A EP 98958812A EP 98958812 A EP98958812 A EP 98958812A EP 1068490 A1 EP1068490 A1 EP 1068490A1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
measuring device
gap
stator
rotor
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Withdrawn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
EP98958812A
Other languages
German (de)
English (en)
Inventor
Asta Reichl
Thomas Klotzbuecher
Tilman Gauger
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 EP1068490A1 publication Critical patent/EP1068490A1/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Withdrawn legal-status Critical Current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
    • 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
    • G01D5/142—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 using Hall-effect devices
    • G01D5/145—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 using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes

Definitions

  • the invention is based on a measuring device for contactless detection of an angle of rotation according to the type of the independent claims.
  • a measuring device is known from FR-OS 90 15 223 in which a stator and a rotor are moved relative to one another. There is a small air gap between the stator, which is made of magnetically conductive material, and the rotor.
  • a first annular permanent magnet which is radially polarized is arranged in the rotor over a length of 180 degrees. In the remaining area of the stator, which is also 180 degrees, there is a second annular permanent magnet with opposite polarization.
  • the stator has two diametrically opposed air gaps.
  • a Hall sensor is arranged at least in one of these air gaps.
  • the linear measuring range of the measuring signal generated in this way is of a size of + . Limited to 75 degrees. Furthermore, this linear measuring range has a change of sign. Counter if necessary, this could be complexly corrected in a subsequent electrical circuit.
  • a sensor is known from the subsequently published DE-OS 196 34 381.3, which is arranged one above the other in three levels.
  • the rotor forms the middle level, whereby it consists of the carrier plate for a permanent magnet.
  • the carrier plate itself consists of magnetically non-conductive material, so that the magnetic flux over the other two levels, i.e. runs the stator and is controlled with the help of two spacers, which are arranged between the two planes of the stator.
  • a relatively large angular range can be measured with this sensor without changing the sign, but it is not suitable for measurements over 180 degrees.
  • the measuring device for the contactless detection of an angle of rotation with the characterizing features of the independent claim has the advantage that the sensor enables an angle of rotation detection of over 200 degrees.
  • the almost linear measuring line shows no sign change.
  • the zero point of the induction is equal to the zero point of the angle measurement.
  • the drive axis does not have to be arranged in the center of the sensor.
  • Figure 1 shows a longitudinal section in the direction I-I of Figure 2 through a first embodiment
  • Figures 2 and 3 a plan view and a bottom view
  • Figure 4 shows the shape of a permanent magnet
  • Figure 5 shows the associated representation of the spiral of the permanent magnet over the Angle ⁇
  • Figures 6 and 7 show the position of the permanent magnet and the respective magnetic flux at a minimum and maximum angle
  • FIG. 8 shows a longitudinal section in the direction VIII-VIII according to FIG. 10 through a further exemplary embodiment
  • FIGS. 9 and 10 show a bottom view and a top view of this exemplary embodiment
  • Figure 11 shows the shape of the permanent magnet in this embodiment.
  • Figures 12 and 13 show modifications of the flux guide parts of the stator.
  • 10 denotes a sensor, which consists of a stator 11 and a rotor 12.
  • the stator has a base plate 13 and a cover plate 14, which are separated by two spacers 15, 16.
  • the base plate 13 has a bore
  • the carrier plate 20 of the rotor 12 is fastened centrally on the axis 19 and consists of magnetically non-conductive material.
  • the cover plate 11 of the sensor 10 is shown in more detail in FIG. 2 and consists of the two segments 24 and 25. The two segments 24, 25 are separated from one another by a gap 26 and a second gap 27.
  • the gap 26 runs in the radial direction straight from the center of the ceiling plate 14 to the outer circumference.
  • a magnetic field sensitive element 30 is arranged in the gap 26. This can be, for example, a field plate, a magnetic transistor, magnetoresistive elements or a Hall element. It is important here that the magnetic field-sensitive component has a linear dependence of its output signal on the magnetic induction B. Instead of one element, several elements can be used for redundant measurement (safety measurement).
  • the gap 27 has a radially outwardly directed area 32 starting from the center of the ceiling plate 11, which has an angle of approximately 120 ° to the gap 26 and a subsequently curved area 33 which leads to the circumference.
  • the two gaps 26 and 27 are to be coordinated with one another in such a way that the magnetic flux of the permanent magnet 21 runs as far as possible only over the gap 26 and the gap 27 almost prevents magnetic flux.
  • the gap 27 is wider than the gap 26. Instead of air, the gap 27 can also be filled with other magnetically non-conductive material.
  • the two segments 24, 25 must be arranged so that each segment is at least as large as the angular segment of the permanent magnet 21. This means that if the permanent magnet is greater than 180 degrees, the two segments 24, 25 are as in FIG Figure 2 shown, nested. Furthermore, it is important that the air gap 27 and the shape of the permanent magnet 21 are matched to one another in such a way that the permanent magnet 21 is maintained throughout Rotary movement does not run over the gap 27.
  • the shape of a permanent magnet 21 is shown in FIG. 4. It can be seen that one end of the permanent magnet must have a smaller width than the other end of the permanent magnet 21. It must also be in the form of a spiral or an arc.
  • the shape of the permanent magnet is shown in more detail in the diagram according to FIG. 5. The course of the radius over the angular range to be determined is shown. One side of the permanent magnet should have a linear slope r. The other side of the permanent magnet then results in a radius R, which can be calculated using the following equation.
  • A area of the permanent magnet
  • ⁇ angle of rotation
  • the formula is based on the assumption of a constant thickness of the permanent magnet over its length.
  • the permanent magnet 21 can also be produced from plastic-bonded rare earth magnets (for example Sn ⁇ Co ⁇ ⁇ ).
  • the two segments 24, 25 of the ceiling plate 14, the base plate 13 and the spacer 16 consist of magnetically conductive, in particular soft magnetic material.
  • the second spacer 15, however, consists of non-magnetically conductive material.
  • Spacer 16 is connected to the base plate 13 and to the larger of the two segments of the ceiling plate 14.
  • the magnetically non-conductive spacer 15 is between the base plate 13 and the smaller segment 25 orderly.
  • the spacer 15 can also consist of air.
  • FIGS. 6 and 7 now show the arrangement of the permanent magnet with respect to the two segments 24, 25 at the smallest (FIG. 6) and at the largest angle (FIG. 7).
  • the respective magnetic flux is also shown in the figures.
  • the direction of rotation of the permanent magnet is clockwise. It can be seen from FIG. 6 that the permanent magnet 21 is located completely under the segment 24 at the angle of rotation of zero degrees.
  • the magnetic flux occurs completely from the permanent magnet 21 into the segment 24 via the spacer 16 and, not shown in FIG. 6, via the base plate 13 back to the permanent magnet 21. At zero degrees there is no magnetic flux through the gap 26 and thus through the magnetic field sensitive element 30 possible.
  • the permanent magnet When the sensor is deflected completely, ie at the maximum angle of rotation, as shown in FIG. 7, the permanent magnet is located completely under the segment 25. The wider end of the permanent magnet 21 projects toward the area 32 of the gap 27. The length of the region 32 of the gap 27 is thus to be matched to the width of the permanent magnet 21 at this end. It can be seen from FIG. 7 that the magnetic flux from the permanent magnet 21 via the segment 25, the gap 26 and the magnetic field-sensitive element 30 arranged there to the segment 24. Furthermore, the magnetic lines run over the spacer 16 and the base plate 13 back to the permanent magnet 21. The gap 27 prevents the magnetic lines from flowing in its area from the segment 25 to the segment 24. All magnetic lines must run across the gap 26 and the magnetic field sensitive element 30. With this arrangement, a linear course of the magnetic induction B in the magnetic field sensitive is obtained Element 30 over an angular range of up to 240 degrees, with no change of sign in the linear measurement curve.
  • FIG. 9 a modification of the ceiling plate 14a of the stator 11a is shown.
  • the base plate 13 shown in FIG. 9 corresponds to that of the first exemplary embodiment.
  • the gap 26a which has the magnetic field-sensitive element 30, is bent in the direction of rotation of the rotor 12. Since the direction of rotation is clockwise, the gap 26a is bent clockwise.
  • the gap 27a preventing magnetic flux also has a radially formed region 32a and a curved region 33a in FIG. Due to the shape of the gap 26a bent in the direction of rotation, the permanent magnet 21a, as shown in FIG.
  • the permanent magnet 21a can have a smaller angular range than the angular range to be measured, for example, at a measuring angle of 240 degrees, a permanent magnet 21a with an angular range would exist of 170 degrees. Furthermore, the permanent magnet 21a has the same thickness over its entire length. Between the gap 26a and the permanent magnet 21a, the same area of the permanent magnet 21a must move under the segment 24a or the segment 25a for each angular segment to be represented, assuming a constant thickness of the permanent magnet. Since the change in area in the outer radius of the permanent magnet 21a is greater than in the region of the inner radius of the permanent magnet 21a, the gap 26a must be arranged such that it is bent in the rotational movement of the rotor 12. Because the permanent magnet 21a is smaller than that
  • the two segments 24a and 25a can be nested so that an angle of rotation of almost 360 degrees can be detected with a linear measurement signal without changing the sign.
  • a corresponding presentation Position is shown in Figure 12.
  • the segment 25b has an almost heart-shaped configuration.
  • axis 11 has e.g. a rotation angle of 300 °. This requires a magnet with an angular range of 210 °.
  • the air gap 26b should then be bent at 88 °.
  • the width of the area 32b of the gap 27b is determined by the width of the permanent magnet 21.
  • the curvature of the section 33b of the gap 27b is to be adapted to the outer contour and the curvature of the permanent magnet.
  • FIG. 13 now shows a wall of the ceiling panel which is intended to cover a smaller angular range.
  • the advantage of this arrangement is that the two segments 24c and 25c do not have to be symmetrical. It is also possible that, in contrast to the above exemplary embodiments, the axis 19 does not have to act in the center of the sensor 10 or the carrier plate 20.
  • the gap 27c is formed between the segments 24c and 25c in such a way that it is not run over by the permanent magnet 21a and that only a relatively very small magnetic flux is possible via the gap 27c.
  • the gap 27c does not have to be made of air here either; it could also consist of other magnetically non-conductive material and thus prevent magnetic flux.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne un dispositif de mesure pour déterminer sans contact un angle de rotation. Ce dispositif comprend un rotor (12) et un stator (11). Le stator (11) présente, entre autres, deux segments (24, 25) séparés par une fente (26, 27). La fente (27) est conçue de sorte que le champ magnétique produit par un aimant permanent (21) formant le rotor (12) ne s'étend pas au-dessus de la fente (27) mais au-dessus de l'entrefer (26) dans lequel se trouve un élément (30) sensible au champ magnétique. La forme de l'aimant permanent (21) est adaptée à celle de la fente (27) et des deux segments (24, 25) de sorte que, pendant le mouvement de rotation de l'aimant permanent (21), l'entrefer (27) n'est pas balayé par le champ magnétique. On peut ainsi déterminer un angle relativement étendu, dont la courbe de mesure est linéaire et ne présente pas de changement de signe.
EP98958812A 1997-12-04 1998-10-12 Dispositif de mesure pour determiner sans contact un angle de rotation Withdrawn EP1068490A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19753777 1997-12-04
DE19753777A DE19753777A1 (de) 1997-12-04 1997-12-04 Meßvorrichtung zur berührungslosen Erfassung eines Drehwinkels
PCT/DE1998/003003 WO1999030111A1 (fr) 1997-12-04 1998-10-12 Dispositif de mesure pour determiner sans contact un angle de rotation

Publications (1)

Publication Number Publication Date
EP1068490A1 true EP1068490A1 (fr) 2001-01-17

Family

ID=7850708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98958812A Withdrawn EP1068490A1 (fr) 1997-12-04 1998-10-12 Dispositif de mesure pour determiner sans contact un angle de rotation

Country Status (7)

Country Link
US (1) US6433538B1 (fr)
EP (1) EP1068490A1 (fr)
JP (1) JP2001510575A (fr)
KR (1) KR20000070595A (fr)
AU (1) AU730011B2 (fr)
DE (1) DE19753777A1 (fr)
WO (1) WO1999030111A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10234965B4 (de) * 2002-07-31 2005-08-18 Beru Ag Wegsensor
US6931940B2 (en) * 2002-10-02 2005-08-23 Delphi Technologies, Inc. Magnetostrictive strain sensor with hall effect
US6864681B1 (en) 2004-02-02 2005-03-08 Trw Automotive U.S. Llc Sensor assembly
DE102010064007A1 (de) * 2010-12-23 2012-06-28 Bayerische Motoren Werke Aktiengesellschaft Schaltvorrichtung mit Schaltzustandserkennung
JP6678957B2 (ja) 2016-08-23 2020-04-15 Smc株式会社 クランプ装置
KR102058135B1 (ko) * 2019-08-09 2019-12-20 임형빈 스테이터 코어용 3차원 자동 측정 시스템

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2423500C3 (de) * 1974-05-15 1980-05-29 Siemens Ag, 1000 Berlin Und 8000 Muenchen Anordnung zur Erzeugung von elektrischen Signalen mit Feldplatten
DE4103561C2 (de) * 1990-02-07 2001-02-15 Papst Licensing Gmbh & Co Kg Drehstellungsgeber für die Erfassung einer Rotorposition
FR2670286B1 (fr) * 1990-12-05 1993-03-26 Moving Magnet Tech Capteur magnetique de position et de vitesse a sonde de hall.
US5164668A (en) * 1991-12-06 1992-11-17 Honeywell, Inc. Angular position sensor with decreased sensitivity to shaft position variability
US5811968A (en) * 1996-01-06 1998-09-22 Unisia Jecs Corporation Rotation angle sensor
FR2746912B1 (fr) * 1996-03-29 1998-06-05 Sagem Capteur magnetique de position
DE19634281C2 (de) * 1996-08-24 2000-01-27 Bosch Gmbh Robert Meßvorrichtung zur berührungslosen Erfassung eines Drehwinkels bzw. einer linearen Bewegung
DE19634282A1 (de) * 1996-08-24 1998-02-26 Bosch Gmbh Robert Meßvorrichtung zur berührungslosen Erfassung eines Drehwinkels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9930111A1 *

Also Published As

Publication number Publication date
WO1999030111A1 (fr) 1999-06-17
DE19753777A1 (de) 1999-06-10
US6433538B1 (en) 2002-08-13
AU1481999A (en) 1999-06-28
KR20000070595A (ko) 2000-11-25
AU730011B2 (en) 2001-02-22
JP2001510575A (ja) 2001-07-31

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