EP1658474A1 - Procede et dispositif de balayage d'une echelle a magnetisation periodique - Google Patents

Procede et dispositif de balayage d'une echelle a magnetisation periodique

Info

Publication number
EP1658474A1
EP1658474A1 EP04801827A EP04801827A EP1658474A1 EP 1658474 A1 EP1658474 A1 EP 1658474A1 EP 04801827 A EP04801827 A EP 04801827A EP 04801827 A EP04801827 A EP 04801827A EP 1658474 A1 EP1658474 A1 EP 1658474A1
Authority
EP
European Patent Office
Prior art keywords
sensors
scale
circuit
sensor
output signals
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Withdrawn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
EP04801827A
Other languages
German (de)
English (en)
Inventor
Uwe Loreit
Horst Wandres
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.)
Siko Dr Ing G Wandres GmbH
Original Assignee
Siko Dr Ing G Wandres 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 Siko Dr Ing G Wandres GmbH filed Critical Siko Dr Ing G Wandres GmbH
Publication of EP1658474A1 publication Critical patent/EP1658474A1/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Withdrawn legal-status Critical Current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
    • G01D5/244—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 characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—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 characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders
    • 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
    • G01D5/147—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 movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other

Definitions

  • the invention relates to a method for scanning a periodically magnetized scale by means of a measuring element which can be moved relative to the scale, and a device therefor.
  • Path and angle measuring systems are required in many industrial applications today. Reference is made only by way of example to rotary encoders, as are shown, for example, in DE 199 58 440 A1. They are used to determine the revolutions of shafts on working machines.
  • BESTATIGUNGSKOPIE Position measuring systems primarily relate to linear scales, angle measuring systems primarily to rotary scales.
  • the present invention relates to both options.
  • the change in the magnetic field direction has been determined by simple magnetic field sensors (for example Hall sensors) or length sensors adapted to periodic scales.
  • the sensors have to be adjusted to period lengths in order to provide usable signals. This means that with longer periods, the sensors must also be enlarged, which increases the space requirement and makes the sensors more expensive.
  • the object of the present invention is to provide a method and a device of the above-mentioned type with which the above-mentioned disadvantages are eliminated and in particular the measurement of longer periods is improved.
  • each of at least two sensors arranged one after the other in the scale direction generates at least one periodic output signal above the scale position and these output signals are linked to one another in a circuit. It is preferred that the number of output signals from the circuit is the same as that from each sensor.
  • the basic idea of the present invention is to link the output signals of the individual sensors to one another in such a way that they, like that Output gradial of a single sensor can be treated. For example, this is done by adding the output signals of the two sensors that are spaced apart from one another, so that only as much output signals are fed to an evaluation unit as are emitted by one sensor each.
  • the sensor arrangement then behaves like a simple sensor for corresponding interpolation electronics. In this way, for example, a sine curve is achieved in a diagram with which the exact position of the measuring element can be determined very precisely.
  • the added signals are averaged before being output.
  • external interference fields are suppressed.
  • the sensors each emit at least two output signals, the phases of which are offset from one another.
  • the operating voltage it is also possible for the operating voltage to be reversed (inverted) by one of the sensors, which improves the display.
  • a device for carrying out the method according to the invention there are at least two sensors spaced apart in the scale direction in a corresponding measuring element. These sensors should be at a distance from each other that is at most as large as a period length. A distance of a quarter or a half of the period length is preferred.
  • the senor itself should have a length in the scale direction that is smaller than a period length of the scale.
  • very inexpensive, small magnetic sensor chips can be used.
  • the sensors can be of the same type, but it is also contemplated to use sensors of different types.
  • the main sensors used are Hall sensors or magnetoresistive sensors.
  • magnetorestistive sensors are particularly suitable, which contain at least one half or full bridge and consist of a material that works according to the anisotropic magnetoresistive effect (AMR).
  • AMR anisotropic magnetoresistive effect
  • GMR giant magnetoresistive effect
  • the output signals from the sensors are combined in a circuit.
  • it can be a direct parallel connection, so that here two corresponding output signals from the two sensors are connected to form an output signal from the circuit.
  • the components of the sensors and the circuit can be arranged on a circuit board, it is also conceivable that they are combined to form a hybrid circuit. figure description
  • Figure 1 is a block diagram representation of a measuring element associated with a scale
  • FIG. 2 shows a block diagram representation of a further exemplary embodiment of a measuring element assigned to a scale
  • FIG. 3 shows a block diagram representation of the assignment of a measuring element to a scale
  • Figure 4 is a diagram showing a measurement signal from a sensor
  • FIG. 5 shows a diagram with the representation of measurement signals of the sensors according to the invention
  • Figure 6 is a diagram showing measurement signals of the sensors according to the invention after processing.
  • a scale 1 which has a north / south polarization.
  • the respective poles have a period length P.
  • a measuring element 2 is assigned to this scale 1, in which two sensors 3.1 and 3.2 are integrated.
  • Each sensor 3.1 or 3.2 contains four half or full bridges 4 made of electronic components which react to changes in the magnetic field, these being primarily components for Hall sensors or magnetoresistive sensors.
  • From these sensors 3.1 and 3.2 four output signals are fed to a circuit 5 via corresponding lines 6.1 to 6.8.
  • These output signals or the corresponding lines are linked to one another in the circuit 5 in such a way that the circuit 5 in turn outputs 4 output signals 7.1 to 7.4 to an evaluation unit. This is done by a simple direct parallel connection 11.
  • the two sensors 3.1 and 3.2 are apart from each other 8. Each sensor 3.1 or 3.2 also has a length 10.
  • the measuring element 2 is moved in the scale direction A.
  • the two sensors 3.1 and 3.2 are at a distance 8 which corresponds to half the period length P.
  • the above-mentioned at least two sensors 3.1 and 3.2 are used with these large pole lengths P, the output signals of the sensors being linked to one another. This gives the continuous curve.
  • the sensor 3.2 could also be inverted, i.e. its operating voltage is reversed. This then results in the curve shown in dotted lines.
  • the parallel connection 11 results in an averaging of the two signals and thus the desired sinusoidal curve according to FIG. 6
  • This sinusoidal curve enables the position of the measuring element in relation to scale 1 to be determined exactly.
  • the measuring element 2.1 according to FIG. 2 differs from that according to FIG. 1 primarily by the configuration of the circuit 5.1.
  • This is an active circuit 12, in which the individual lines 6 are first brought together after respective resistors 13 and then two adjacent, brought together lines are linked via an electronic component 14. In this case, this results in only two output signals 7.5 and 7.6.
  • the respective signals from sensors 3.1 and 3.2 are averaged by this active circuit.

Landscapes

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

Abstract

L'invention concerne un procédé de balayage d'une échelle (1) à magnétisation périodique à l'aide d'un élément de mesure (2) pouvant être déplacé par rapport à l'échelle. Selon l'invention, au moins deux capteurs (3.1, 3.2) disposés successivement dans la direction de l'échelle (A) doivent chacun produire au moins un signal de sortie périodique sur la position de l'échelle, et ces signaux de sortie doivent être combinés dans un circuit.
EP04801827A 2003-08-05 2004-07-27 Procede et dispositif de balayage d'une echelle a magnetisation periodique Withdrawn EP1658474A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003136558 DE10336558A1 (de) 2003-08-05 2003-08-05 Verfahren und Vorrichtung zum Abtasten eines periodisch magnetisierten Massstabes
PCT/EP2004/008386 WO2005017460A1 (fr) 2003-08-05 2004-07-27 Procede et dispositif de balayage d'une echelle a magnetisation periodique

Publications (1)

Publication Number Publication Date
EP1658474A1 true EP1658474A1 (fr) 2006-05-24

Family

ID=34177392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04801827A Withdrawn EP1658474A1 (fr) 2003-08-05 2004-07-27 Procede et dispositif de balayage d'une echelle a magnetisation periodique

Country Status (3)

Country Link
EP (1) EP1658474A1 (fr)
DE (1) DE10336558A1 (fr)
WO (1) WO2005017460A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4286739B2 (ja) * 2004-07-14 2009-07-01 三菱電機株式会社 磁気検出装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3870879D1 (de) * 1988-10-13 1992-06-11 Siemens Ag Anordnung zur beruehrungsfreien erfassung der drehzahl eines rotierenden zahnrades.
DE9212158U1 (de) * 1992-09-09 1993-10-07 Siemens AG, 80333 München Anordnung zur Erfassung der Drosselklappenstellung in einem Verbrennungsmotor mit Hall-Elementen
DE19909890A1 (de) * 1999-03-06 2000-09-07 Inst Mikrostrukturtechnologie Meßsystem zur inkrementalen Längen- und Winkelmessung
FR2792403B1 (fr) * 1999-04-14 2001-05-25 Roulements Soc Nouvelle Capteur de position et/ou de deplacement comportant une pluralite d'elements sensibles alignes

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2005017460A1 *

Also Published As

Publication number Publication date
DE10336558A1 (de) 2005-03-10
WO2005017460A1 (fr) 2005-02-24

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