WO2020119909A1 - Distance-measuring device - Google Patents

Distance-measuring device Download PDF

Info

Publication number
WO2020119909A1
WO2020119909A1 PCT/EP2018/084821 EP2018084821W WO2020119909A1 WO 2020119909 A1 WO2020119909 A1 WO 2020119909A1 EP 2018084821 W EP2018084821 W EP 2018084821W WO 2020119909 A1 WO2020119909 A1 WO 2020119909A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
output signals
segment
sensor
sensors
Prior art date
Application number
PCT/EP2018/084821
Other languages
German (de)
French (fr)
Inventor
Michael Schink
Samuel Huber
Lukas SCHWENDENER
Original Assignee
Oetiker Schweiz Ag
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 Oetiker Schweiz Ag filed Critical Oetiker Schweiz Ag
Priority to PCT/EP2018/084821 priority Critical patent/WO2020119909A1/en
Publication of WO2020119909A1 publication Critical patent/WO2020119909A1/en

Links

Classifications

    • 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
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
    • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type

Definitions

  • DE 101 61 905 A1 discloses a device for position detection in a linear motor, the stationary part of which carries magnetic poles with alternating N / S polarization and two magnetic field sensors are arranged on the carriage at a distance corresponding to half the distance between two magnetic poles are. The position of the carriage is determined by counting the signals detected by the sensors.
  • the invention has for its object to provide a displacement measuring device that works both quickly and accurately with reasonable effort.
  • FIG. 1 shows the structure of a displacement measuring device in a schematic side view
  • FIG. 2 shows the arrangement of the sensors in the displacement measuring device according to FIG. 1
  • FIG. 3 shows a schematic illustration of the magnetic strip used in the displacement measuring device.
  • the displacement measuring device serves to determine the position of a movable component 10 relative to a stationary component 11.
  • the movable component 10 is provided with a magnetic strip 12 which, according to FIG. 3, is magnetized with alternating N and S poles at regular intervals. Each pair of poles defines a blessing 16 of the magnetic strip 12.
  • the magnetic strip 12 are provided in this embodiment opposite two fast sensors 13, 14 which are arranged in the direction of movement of the movable member 10 at a distance 17 from each other, which corresponds to a quarter of the length of a segment 16 .
  • the direction of movement of the magnetic strip 12 is indicated with a dash-dotted line 18.
  • the sensors 13, 14 are not accurate enough to assess at which point they are located within a segment 16 of the magnetic strip 12. However, they are fast enough to count the segments 16 passing through.
  • the direction of movement of the movable component 10 can be determined by using two sensors 13, 14.
  • a precise sensor 15 is arranged on the stationary component 11 of the magnetic strip 12 opposite, the output signal of which corresponds to its position within a segment 16 of the magnetic strip 12.
  • the signals of all sensors 13 ... 15 are due to a schematically shown in Fig. 1, on the stationary component 1 1 arranged control 20, which by counting the signals from the sensors 13 and 14, the rough distance and the direction of of the path covered by the movable component 10. Furthermore, the controller 20 determines the exact position within the respective segment 16 of the magnetic strip 12 from the signal of the sensor 15.
  • the described displacement measuring device works with any sensor types and combinations of types. Both digital and analog sensors can be used.

Abstract

The invention relates to a device for contactless distance measurement, in which device magnets are arranged at regular spacings with alternating N and S polarization on the movable component, each magnet pole pair forming a segment (16). A sensor apparatus (13, 14) arranged on the stationary component (11) produces output signals corresponding to the relative movement between the two components (10, 11). A controller (20) determines the segment in which the movable component (10) is located by counting said output signals. An additional sensor (15) is also arranged on the stationary component (11), from the output signal of which additional sensor the controller (20) determines the position of the movable component (10) within a segment (16).

Description

Wegmessvorrichtung Position measuring device
Stand der Technik State of the art
[0001 ] Die berührungslose Wegmessung heutiger Anwendungen sieht sich häufig wider sprüchlichen Anforderungen ausgesetzt: Sie soll sowohl sehr schnell aus auch sehr genau sein. Angesichts dieses Widerspruchs vermögen preisgünstige und kleine berüh rungslose Wegmessvorrichtungen immer nur einer der beiden Anforderungen zu genü gen. The contactless displacement measurement of today's applications is often exposed to contradictory requirements: it should be both very fast and very precise. In view of this contradiction, inexpensive and small non-contact displacement measuring devices can only ever meet one of the two requirements.
[0002] Aus DE 101 61 905 A1 ist eine Vorrichtung zur Positionserfassung bei einem Linearmotor bekannt, dessen stationärer Teil Magnetpole mit abwechselnder N/S-Polari- sierung trägt und an dessen Schlitten zwei Magnetfeldsensoren in einem dem halben Abstand zwischen zwei Magnetpolen entsprechenden Abstand angeordnet sind. Durch Auszählen der von den Sensoren erfassten Signale wird die Position des Schlittens ermittelt. [0002] DE 101 61 905 A1 discloses a device for position detection in a linear motor, the stationary part of which carries magnetic poles with alternating N / S polarization and two magnetic field sensors are arranged on the carriage at a distance corresponding to half the distance between two magnetic poles are. The position of the carriage is determined by counting the signals detected by the sensors.
Abriss der Erfindung Outline of the invention
[0003] Der Erfindung liegt die Aufgabe zugrunde, eine Wegmessvorrichtung zu schaffen, die bei vertretbarem Aufwand sowohl schnell als auch genau arbeitet. The invention has for its object to provide a displacement measuring device that works both quickly and accurately with reasonable effort.
[0004] Die Lösung dieser Aufgabe gelingt mit der in Anspruch 1 angegebenen Weg messvorrichtung, die mit mindestens einem preisgünstigen schnellen aber weniger genauen Sensor und einem preisgünstigen genauen aber weniger schnellen Sensor arbeitet. Dadurch lassen sich hohe Anforderungen an Genauigkeit und Schnelligkeit preis günstiger erfüllen als mit herkömmlichen einteiligen jedoch sehr teuren Wegmess vorrichtungen. This object is achieved with the path measuring device specified in claim 1, which works with at least one inexpensive fast but less accurate sensor and an inexpensive accurate but less fast sensor. As a result, high demands on accuracy and speed can be met more cheaply than with conventional one-piece but very expensive position measuring devices.
Kurzbeschreibung der Zeichnung Brief description of the drawing
[0005] Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Darin zeigt An embodiment of the invention is explained below with reference to the drawing. It shows
Fig. 1 den Aufbau einer Wegmessvorrichtung in einer schematischen Seitenansicht, Fig. 2 die Anordnung der Sensoren in der Wegmessvorrichtung nach Fig. 1 , und Fig. 3 eine schematische Darstellung des in der Wegmessvorrichtung benutzten Magnetstreifens. 1 shows the structure of a displacement measuring device in a schematic side view, FIG. 2 shows the arrangement of the sensors in the displacement measuring device according to FIG. 1, and FIG. 3 shows a schematic illustration of the magnetic strip used in the displacement measuring device.
Beschreibung des Ausführungsbeispiels Description of the embodiment
[0006] Gemäß der Zeichnung dient die Wegmessvorrichtung dazu, die Position eines bewegbaren Bauteils 10 relativ zu einem stationären Bauteil 11 zu ermitteln. Das bewegbare Bauteil 10 ist mit einem Magnetstreifen 12 versehen, der gemäß Fig. 3 mit in regelmäßigen Abständen abwechselnden N- und S-Polen magnetisiert ist. Jedes Polpaar definiert ein Segnet 16 des Magnetstreifens 12. [0007] An dem stationären Bauteil 11 sind bei diesem Ausführungsbeispiel dem Magnet streifen 12 gegenüber zwei schnelle Sensoren 13, 14 vorgesehen, die in Bewegungs richtung des bewegbaren Bauteils 10 in einem Abstand 17 voreinander angeordnet sind, der einem Viertel der Länge eines Segmentes 16 entspricht. In Fig. 2 ist die Bewegungs richtung des Magnetstreifens 12 mit einer strichpunktierten Linie 18 angedeutet. According to the drawing, the displacement measuring device serves to determine the position of a movable component 10 relative to a stationary component 11. The movable component 10 is provided with a magnetic strip 12 which, according to FIG. 3, is magnetized with alternating N and S poles at regular intervals. Each pair of poles defines a blessing 16 of the magnetic strip 12. On the stationary component 11, the magnetic strip 12 are provided in this embodiment opposite two fast sensors 13, 14 which are arranged in the direction of movement of the movable member 10 at a distance 17 from each other, which corresponds to a quarter of the length of a segment 16 . In Fig. 2, the direction of movement of the magnetic strip 12 is indicated with a dash-dotted line 18.
[0008] Die Sensoren 13, 14 sind nicht genau genug um zu beurteilen, an welcher Stelle innerhalb eines Segments 16 des Magnetstreifens 12 sie sich befinden. Sie sind aber schnell genug, um die durchlaufenden Segmente 16 zu zählen. Durch die Verwendung zweier Sensoren 13, 14 lässt sich die Bewegungsrichtung des bewegbaren Bauteils 10 bestimmen. The sensors 13, 14 are not accurate enough to assess at which point they are located within a segment 16 of the magnetic strip 12. However, they are fast enough to count the segments 16 passing through. The direction of movement of the movable component 10 can be determined by using two sensors 13, 14.
[0009] Ferner ist an dem stationären Bauteil 11 dem Magnetstreifen 12 gegenüber ein genauer Sensor 15 angeordnet, dessen Ausgangssignal seiner Position innerhalb eines Segmentes 16 des Magnetstreifens 12 entspricht. Furthermore, a precise sensor 15 is arranged on the stationary component 11 of the magnetic strip 12 opposite, the output signal of which corresponds to its position within a segment 16 of the magnetic strip 12.
[00010] Die Signale aller Sensoren 13...15 liegen an einer in Fig. 1 schematisch dar gestellten, an dem stationären Bauteil 1 1 angeordneten Steuerung 20, die durch Zählen der Signale der Sensoren 13 und 14 die grobe Distanz und die Richtung des von dem bewegbaren Bauteil 10 zurückgelegten Weges ermittelt. Ferner ermittelt die Steuerung 20 aus dem Signal des Sensors 15 die genaue Position innerhalb des jeweiligen Segments 16 des Magnetstreifens 12. The signals of all sensors 13 ... 15 are due to a schematically shown in Fig. 1, on the stationary component 1 1 arranged control 20, which by counting the signals from the sensors 13 and 14, the rough distance and the direction of of the path covered by the movable component 10. Furthermore, the controller 20 determines the exact position within the respective segment 16 of the magnetic strip 12 from the signal of the sensor 15.
[0001 1] Das oben beschriebene Ausführungsbeispiel arbeitet zur Erkennung der Bewegungsrichtung mit zwei schnellen Sensoren 13, 14. Es erscheint auch möglich, nur einen schnellen Sensor vorzusehen und zur Richtungsbestimmung die Signale dieses und des genauen Sensors heranzuziehen. The embodiment described above works to detect the direction of movement with two fast sensors 13, 14. It also appears possible to provide only one fast sensor and to use the signals of this and the exact sensor to determine the direction.
[00012] Die beschriebene Wegmessvorrichtung funktioniert mit beliebigen Sensortypen und -typenkombinationen. Sowohl digitale als auch analoge Sensoren können verwendet werden. The described displacement measuring device works with any sensor types and combinations of types. Both digital and analog sensors can be used.
Bezugszeichen Reference numerals
10 Bewegbares Bauteil 10 Movable component
1 1 Stationäres Bauteil 1 1 Stationary component
12 Magnetstreifen 12 magnetic strips
13, 14 Schnelle Sensoren 13, 14 Fast sensors
15 Genauer Sensor 15 Exact sensor
16 Segmente des Magnetstreifens 12 16 segments of the magnetic strip 12
17 Abstand zwischen den Sensoren 13 und 14 17 Distance between sensors 13 and 14
18 Bewegungsrichtung des Magnetstreifens 12 18 Direction of movement of the magnetic strip 12
20 Steuerung 20 control

Claims

Patentansprüche Claims
1. Vorrichtung zur berührungslosen Messung des von einem bewegbaren Bauteil (10) relativ zu einem stationären Bauteil (1 1 ) zurückgelegten Weges, wobei 1. Device for the contactless measurement of the distance traveled by a movable component (10) relative to a stationary component (1 1), wherein
an einem der beiden Bauteile in regelmäßigen Abständen Magnete mit abwech selnder N- und S-Polarisierung angeordnet sind und jedes Magnetpolpaar ein Segment (16) bildet, magnets with alternating N and S polarization are arranged at regular intervals on one of the two components and each pair of magnetic poles forms a segment (16),
am anderen Bauteil eine Sensoreinrichtung (13, 14) zur Erzeugung von der Relativbewegung zwischen den beiden Bauteilen (10, 11 ) entsprechenden Ausgangs signalen angeordnet ist, und on the other component a sensor device (13, 14) for generating the relative movement between the two components (10, 11) corresponding output signals is arranged, and
eine Steuerung (20) durch Auswerten der von der Sensoreinrichtung (13, 14) erzeugten Ausgangssignale das Segment (16) ermittelt, in dem sich das bewegbare Bauteils (10) relativ zu dem stationären Bauteil (11 ) befindet, a controller (20) determines the segment (16) in which the movable component (10) is located relative to the stationary component (11) by evaluating the output signals generated by the sensor device (13, 14),
dadurch gekennzeichnet, dass an dem besagten anderen Bauteil ein weiterer Sensor (15) angeordnet ist und die Steuerung (20) aus dem Signal des weiteren Sensors (15) die Position des bewegbaren Bauteils (10) innerhalb des jeweiligen Segments (16) ermittelt. characterized in that a further sensor (15) is arranged on said other component and the controller (20) determines the position of the movable component (10) within the respective segment (16) from the signal of the further sensor (15).
2. Vorrichtung nach Anspruch 1 , wobei die Sensoreinrichtung (13, 14) zur Erzeugung von der Relativbewegung zwischen den beiden Bauteilen (10, 11 ) entsprechenden Ausgangssignalen zwei Sensoren (13, 14) umfasst, die in Bewegungsrichtung einen solchen Abstand (17) voneinander haben, dass ihre Ausgangssignale phasenversetzt sind, 2. Device according to claim 1, wherein the sensor device (13, 14) for generating output signals corresponding to the relative movement between the two components (10, 11) comprises two sensors (13, 14) which are spaced apart from one another in the direction of movement have their output signals out of phase,
3. Vorrichtung nach Anspruch 2, wobei die Ausgangssignale der beiden Sensoren (13, 14) der Sensoreinrichtung um 90° phasenversetzt sind. 3. Device according to claim 2, wherein the output signals of the two sensors (13, 14) of the sensor device are phase-shifted by 90 °.
PCT/EP2018/084821 2018-12-13 2018-12-13 Distance-measuring device WO2020119909A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/084821 WO2020119909A1 (en) 2018-12-13 2018-12-13 Distance-measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/084821 WO2020119909A1 (en) 2018-12-13 2018-12-13 Distance-measuring device

Publications (1)

Publication Number Publication Date
WO2020119909A1 true WO2020119909A1 (en) 2020-06-18

Family

ID=65009685

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/084821 WO2020119909A1 (en) 2018-12-13 2018-12-13 Distance-measuring device

Country Status (1)

Country Link
WO (1) WO2020119909A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440214A1 (en) * 1994-11-10 1996-05-15 Itt Ind Gmbh Deutsche Rotation transmitter using rotatable magnet systems with magnetic North and South poles
DE10161905A1 (en) 2001-12-17 2003-06-18 Elektro Beckhoff Gmbh Unterneh Arrangement for linear motor position detection, has magnetic field sensor(s) on movable carriage, sinusoidal signal sampling unit, and unit for determining position value from sampled values
US20050258986A1 (en) * 2003-11-17 2005-11-24 Hare Alva E Precision material-handling robot employing high-resolution, compact absolute encoder
DE102007008870A1 (en) * 2007-02-21 2008-09-04 Hl-Planar Technik Gmbh Arrangement and method for the absolute determination of the linear position or the angular position expressed by an angle
DE102008026604A1 (en) * 2008-06-03 2009-12-10 Continental Teves Ag & Co. Ohg Position or speed sensor arrangement, particularly revolution speed sensor arrangement for use in motor vehicles, has sensor with sensitive principal plane and encoder with encoder groove surface

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440214A1 (en) * 1994-11-10 1996-05-15 Itt Ind Gmbh Deutsche Rotation transmitter using rotatable magnet systems with magnetic North and South poles
DE10161905A1 (en) 2001-12-17 2003-06-18 Elektro Beckhoff Gmbh Unterneh Arrangement for linear motor position detection, has magnetic field sensor(s) on movable carriage, sinusoidal signal sampling unit, and unit for determining position value from sampled values
US20050258986A1 (en) * 2003-11-17 2005-11-24 Hare Alva E Precision material-handling robot employing high-resolution, compact absolute encoder
DE102007008870A1 (en) * 2007-02-21 2008-09-04 Hl-Planar Technik Gmbh Arrangement and method for the absolute determination of the linear position or the angular position expressed by an angle
DE102008026604A1 (en) * 2008-06-03 2009-12-10 Continental Teves Ag & Co. Ohg Position or speed sensor arrangement, particularly revolution speed sensor arrangement for use in motor vehicles, has sensor with sensitive principal plane and encoder with encoder groove surface

Similar Documents

Publication Publication Date Title
EP1243897B1 (en) Magnetic position sensor
EP1662232A1 (en) Linear position sensor
CH652496A5 (en) Integrated position sensor at an actuator cylinder
DE19818799A1 (en) Rotation angle measuring device for rotary shaft, e.g. steering shaft of automobile
DE102017222674A1 (en) displacement sensor
EP2899510A1 (en) Circuit and measuring system
WO2009121193A1 (en) Magnetic linear sensor arrangement
EP1556665B1 (en) Scanner head comprising a magnet and a hall element for use in a co-ordinate measuring device
DE102011053309A1 (en) Position / displacement measuring system
EP1260787A1 (en) Angle sensor with magnetoresistive sensing elements
DE102015013022A1 (en) Magnetic field measuring device
EP3214412B1 (en) Positioning unit
DE10123539B4 (en) Magnetic length measuring device
WO2020119909A1 (en) Distance-measuring device
EP0437597B1 (en) Device for measuring lengths, angles and the like
DE4237540C2 (en) Process for high-resolution measurement of linear and rotary positions
DE102013214425A1 (en) Magnetoresistive proximity switch used in assembly for sensing position of metering piston in lubricant distributor, has a magnetic angle sensor to provide output signal depending on change in magnetic field direction caused by target
DE102008010374B4 (en) Angle measuring device for a rotating encoder system
DE10140710A1 (en) Angle sensor with magneto-resistive sensor elements
DE102005045774A1 (en) Contactless position measuring device, has measuring head which determines direction of magnetic field that is influenced by position of component
DE102011079631A1 (en) Device for determining motion parameters
DE102011079633A1 (en) Magnetic sensor for measuring a magnetic field of a magnetic multipole and associated device for determining motion parameters
EP0678733A1 (en) Magnetic measuring system
DE102019120790A1 (en) Sensor arrangement with multipole encoder and rotation bearing
EP1243898A1 (en) Magnetic position sensor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18830759

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18830759

Country of ref document: EP

Kind code of ref document: A1