[go: up one dir, main page]

DE202005001834U1 - Position measurement arrangement for measuring the relative angular positions of two objects rotating relative to each other has a coding disk with overlapping radial and circumferential markings of two separate measurement tracks - Google Patents

Position measurement arrangement for measuring the relative angular positions of two objects rotating relative to each other has a coding disk with overlapping radial and circumferential markings of two separate measurement tracks Download PDF

Info

Publication number
DE202005001834U1
DE202005001834U1 DE200520001834 DE202005001834U DE202005001834U1 DE 202005001834 U1 DE202005001834 U1 DE 202005001834U1 DE 200520001834 DE200520001834 DE 200520001834 DE 202005001834 U DE202005001834 U DE 202005001834U DE 202005001834 U1 DE202005001834 U1 DE 202005001834U1
Authority
DE
Germany
Prior art keywords
track
measuring device
scanning
position measuring
graduation lines
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.)
Expired - Lifetime
Application number
DE200520001834
Other languages
German (de)
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.)
Dr Johannes Heidenhain GmbH
Original Assignee
Dr Johannes Heidenhain 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 Dr Johannes Heidenhain GmbH filed Critical Dr Johannes Heidenhain GmbH
Priority to DE200520001834 priority Critical patent/DE202005001834U1/en
Publication of DE202005001834U1 publication Critical patent/DE202005001834U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
    • 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
    • G01D5/2454—Encoders incorporating incremental and absolute signals
    • G01D5/2455—Encoders incorporating incremental and absolute signals with incremental and absolute tracks on the same encoder
    • G01D5/2457—Incremental encoders having reference marks
    • 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
    • G01D5/26—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
    • 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
    • G01D5/26—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/3473—Circular or rotary 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
    • G01D5/26—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/34776—Absolute encoders with analogue or digital scales
    • G01D5/34792—Absolute encoders with analogue or digital scales with only digital scales or both digital and incremental scales

Landscapes

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

Abstract

Position measurement arrangement for determining the angular position between two objects that move, especially rotate relative to each other. The arrangement comprises a coding disk (1), mounted on the first of the two objects, with a first measurement track (11) comprised or radial markings and a second measurement track (12) comprises of circumferential markings for detecting a positioning error of the coding disk. The two tracks are scanned using a scanning unit that is mounted on the second of the two objects. The markings of the two tracks intersect.

Description

Die Erfindung betrifft eine Positionsmesseinrichtung zur Bestimmung der Winkellage zweier zueinander beweglicher Objekte nach dem Oberbegriff des Anspruchs 1.The The invention relates to a position measuring device for determination the angular position of two mutually movable objects according to the preamble of Claim 1.

Eine derartige Positionsmesseinrichtung umfasst zur Winkelmessung eine Maßverkörperung, die einem der beiden entlang einer Messrichtung zueinander beweglichen Objekte zugeordnet ist und die einerseits eine der Ermittlung der Winkellage der beiden zueinander beweglichen Objekte dienende erste Spur aufweist, welche aus einer Vielzahl radial bezüglich eines Mittelpunktes der Maßverkörperung erstreckter, entlang der Messrichtung hintereinander angeordneter und voneinander beabstandeter Teilungsstriche besteht, sowie andererseits mindestens eine der Ermittlung von Lagefehlern der Maßverkörperung dienende zweite Spur, welche aus einer Mehrzahl entlang der Messrichtung erstreckter, in radialer Richtung hintereinander angeordneter und voneinander beabstandeter Teilungsstriche besteht. Die Messrichtung wird dabei insbesondere durch eine Kreisbahn gebildet, so dass die Teilungsstriche der ersten Spur entlang einer Kreisbahn hintereinander und voneinander beabstandet angeordnet sind und die zweiten Teilungsstriche entlang jeweils einer Kreisbahn um einen Mittelpunkt der Maßverkörperung umlaufen.A Such position measuring device comprises an angle measurement measuring scale, the one of the two along a measuring direction to each other movable Objects is assigned and on the one hand a determination of the Angular position of the two mutually movable objects serving first track which has a plurality of radially with respect to a center of the Measuring standard extended, along the measuring direction arranged one behind the other and spaced apart graduation marks, and on the other hand at least one of the determination of positional errors of the material measure serving second track, which consists of a plurality along the measuring direction extended, arranged one behind the other in the radial direction and from each other spaced graduation marks. The measuring direction is thereby formed in particular by a circular path, so that the graduation lines of the first track along a circular path one behind the other and from each other spaced apart and the second graduation lines along in each case a circular path around a center of the material measure circulate.

Zum Abtasten der Maßverkörperung dient eine Abtasteinheit der Positionsmesseinrichtung, die dem anderen der beiden zueinander beweglichen Objekte zuzuordnen ist und die Abtastmittel zur Abtastung beider Spuren der Maßverkörperung aufweist.To the Scanning the material measure serves a scanning unit of the position measuring device, the other is attributable to the two mutually movable objects and the Having scanning means for scanning both tracks of the material measure.

Eine derartige Positionsmesseinrichtung ist beispielsweise in der DE 42 25 320 C1 beschrieben. Bei der bekannten Positionsmesseinrichtung sind auf einem scheibenförmigen Codeträger eine der Ermittlung der Winkellage zweier zueinander verdrehbarer Objekte dienende erste Spur sowie eine der Ermittlung von Exzentrizitäten bezüglich der Lagerung des Codeträgers dienende zweite Spur radial nebeneinander angeordnet. Der Platzbedarf auf dem Codeträger steigt hiermit entsprechend der Anzahl benötigter Lageinformationen, die zusätzliche Spuren erfordern.Such a position measuring device is for example in the DE 42 25 320 C1 described. In the known position-measuring device, a first track serving to determine the angular position of two mutually rotatable objects and a second track serving to determine eccentricities with respect to the mounting of the code carrier are arranged radially next to one another on a disk-shaped code carrier. The space requirement on the code carrier hereby increases according to the number of location information required, which require additional tracks.

Der Erfindung liegt das Problem zugrunde, eine Positionsmesseinrichtung der eingangs genannten Art im Hinblick auf den Platzbedarf der Maßverkörperung zu verbessern.Of the Invention is based on the problem, a position measuring device of the type mentioned in terms of space requirements of the material measure to improve.

Dieses Problem wird erfindungsgemäß durch die Schaffung einer Positionsmesseinrichtung mit den Merkmalen des Anspruchs 1 gelöst.This Problem is inventively the creation of a position measuring device with the features of Claim 1 solved.

Danach sind die beiden Spuren der Maßverkörperung einander derart überlagert, dass sich deren Teilungsstriche schneiden.After that are the two traces of the material measure superimposed on each other, that their graduation lines intersect.

Hierdurch kann der Platzbedarf der Maßverkörperung auf einem Codeträger erheblich reduziert werden.hereby can the space requirement of the material measure on a code carrier be significantly reduced.

Die erfindungsgemäße Lösung beruht auf der Erkenntnis, dass bei geeigneter Anordnung der Abtastmittel einer Abtasteinheit, mit der die beiden (unterschiedlichen Zwecken dienenden) Spuren der Maßverkörperung abzutasten sind, eine Überlagerung der beiden Spuren das Messergebnis in keiner Weise beeinträchtigt.The solution according to the invention is based on the knowledge that with a suitable arrangement of the scanning means a scanning unit with which the two (different purposes Serving) traces of the material measure be sampled, an overlay the two tracks affected the measurement result in any way.

Eine besonders platzsparende Anordnung der beiden Spuren ergibt sich, wenn die radial erstreckten Teilungsstriche der ersten Spur sämtliche in Messrichtung erstreckten Teilungsstriche der zweiten Spur schneiden, so dass die zweite Spur auf dem Codeträger der Maßverkörperung radial nicht über die erste Spur hinausragt. In diesem Fall besteht keinerlei zusätzlicher Platzbedarf für die zweite Spur, die der Erfassung radialer Verlagerungen der Maßverkörperung bzw. des zugehörigen, z.B. scheibenförmigen, Codeträgers dient.A particularly space-saving arrangement of the two tracks results, when the radially extending graduation lines of the first track all in Cutting direction extending graduation lines of the second track, so that the second track on the code carrier of the material measure radially not over the first lane protrudes. In this case there is no additional Space required for the second track, the detection of radial displacements of the material measure or the associated, e.g. disc-shaped, code carrier serves.

Zur Abtastung beider Spuren der Maßverkörperung kann eine Abtasteinheit verwendet werden, die mindestens zwei entlang der Messrichtung voneinander beabstandete Abtastköpfe aufweist, z. B. in einem Winkelabstand von 90°. So lassen sich etwa mit zwei entlang der Messrichtung um 90° voneinander beabstandeten Abtastköpfen einer Abtasteinheit radiale Verlagerungen der Maßverkörperung bzw. des Codeträgers in zwei linear unabhängigen (z.B. zueinander senkrechten) Raumrichtungen messen, was eine Bestimmung jeglicher radialer Verlagerungen in der von der Maßverkörperung aufgespannten Ebene ermöglicht.to Scanning of both tracks of the material measure a scanning unit may be used which is at least two along having scanning heads spaced apart from one another in the measuring direction, z. B. at an angular distance of 90 °. So can be about two along the measuring direction by 90 ° from each other spaced scanheads a scanning unit radial displacements of the material measure or the code carrier in two linearly independent measure (e.g., mutually perpendicular) spatial directions, which is a determination any radial displacements in the of the material measure spanned level allows.

Einzelheiten hinsichtlich einer vorteilhaften Ausbildung der einzelnen Abtastköpfe der Abtasteinheit können der EP 0 482 224 B1 entnommen werden, auf die hinsichtlich einer geeigneten Gestaltung der Abtasteinheit voll inhaltlich Bezug genommen wird. Durch Bildung einer Abtasteinheit aus zwei Messköpfen der in der EP 0 482 224 B1 beschrieben Art, die in Messrichtung der Winkelmessung voneinander beabstandet sind, lässt sich die erforderliche Positionsinformation, einschließlich der Erfassung einer radialen Verlagerung der Maßverkörperung, aus einem sehr kleinen Teilungsfeld (entsprechend einer Quasi-Einfeldabtastung) ableiten.Details regarding an advantageous embodiment of the individual scanning heads of the scanning unit, the EP 0 482 224 B1 are taken to the content of a suitable design of the scanning reference. By forming a scanning unit of two measuring heads in the EP 0 482 224 B1 described type, which are spaced apart in the measuring direction of the angle measurement, the required position information, including the detection of a radial displacement of the material measure, derived from a very small division field (corresponding to a quasi-Einfeldabtastung).

Weitere Einzelheiten und Vorteile der Erfindung werden bei der nachfolgenden Beschreibung eines Ausführungsbeispieles anhand einer Figur deutlich werden.Further Details and advantages of the invention will become apparent in the following Description of an embodiment be clear from a figure.

In der Figur ist eine Codescheibe 1 dargestellt, die durch einen kreisscheibenförmigen Codeträger 10 und eine hierauf angebrachte Maßverkörperung 11, 12 gebildet wird.In the figure is a code disc 1 represented by a circular disk-shaped code carrier 10 and a scale attached to it 11 . 12 is formed.

Die Maßverkörperung 11, 12 der Codescheibe 1 umfasst als erste Spur eine Inkrementalteilung in Form einer Radialteilung, die durch eine Mehrzahl in radialer Richtung R bezüglich des Mittelpunktes 20 der Codescheibe 1 erstreckte und in Umfangsrichtung U der Codescheibe 1 hintereinander angeordneter, äquidistanter erster Teilungsstriche 11 gebildet wird. Ferner umfasst die Maßverkörperung 11, 12 als zweite Spur eine Mehrzahl in Umfangsrichtung U der Codescheibe 1 umlaufender, in radialer Richtung R voneinander beabstandeter und konzentrisch bezüglich des Mittelpunktes 20 der Codescheibe 1 angeordneter zweiter Teilungsstriche 12.The measuring standard 11 . 12 the code disc 1 comprises as the first track an incremental pitch in the form of a radial pitch, which is defined by a plurality in the radial direction R with respect to the center 20 the code disc 1 extended and in the circumferential direction U of the code disk 1 arranged in a row, equidistant first graduation marks 11 is formed. Furthermore, the material measure includes 11 . 12 as a second track a plurality in the circumferential direction U of the code disk 1 circumferential, spaced in the radial direction R and concentric with respect to the center 20 the code disc 1 arranged second division lines 12 ,

Die radial erstreckten, ersten Teilungsstriche 11 sowie die in Umfangsrichtung U erstreckten zweiten Teilungsstriche 12 bilden ein gebogenes Kreuzgitter, das nach außen hin durch eine äußere Kreislinie begrenzt ist, die beispielsweise mit dem äußeren Rand 15 der Codescheibe 1 zusammenfällt.The radially extended, first graduation lines 11 and the second graduation lines extending in the circumferential direction U 12 form a curved cross lattice which is bounded on the outside by an outer circular line, for example, with the outer edge 15 the code disc 1 coincides.

Die Codescheibe 1 ist derart drehfest mit einer drehbar gelagerten Welle 2 (Drehwelle) verbunden, dass die durch die Welle 2 definierte Drehachse mit dem Mittelpunkt 20 der Codescheibe 1 zusammenfällt und sich senkrecht zur Ebene der Codescheibe 1 erstreckt.The code disc 1 is rotationally fixed with a rotatably mounted shaft 2 (Rotary shaft) connected by the shaft 2 defined axis of rotation with the center 20 the code disc 1 coincides and is perpendicular to the plane of the code disc 1 extends.

Bei einer Drehbewegung D der Welle 2 führt demnach die Codescheibe 1 eine gleiche Drehbewegung D um jene mit ihrem Mittelpunkt 20 zusammenfallende Drehachse aus. Zur Erfassung und Messung dieser Drehbewegung D dienen die eine periodische Inkrementalteilung bildenden, in Umfangsrichtung U hintereinander angeordneten und radial erstreckten ersten Teilungsstriche 11 der ersten Spur der Maßverkörperung 11, 12. Hierzu wird die durch die radial erstreckten Teilungsstriche 11 gebildete Radialteilung (Inkrementalteilung) in bekannter Weise mittels einer der Codescheibe 1 zugeordneten Abtasteinheit 3 abgetastet, die vorliegend zwei in Drehrichtung D bzw. Umfangsrichtung U der Codescheibe 1 in einem Winkelabstand von 90° hintereinander angeordnete Abtastköpfe 31, 32 umfasst. Zumindest einer dieser Abtastköpfe 31, 32 der Abtasteinheit 3 tatstet in bekannter Weise nach einem geeigneten physikalischen Messprinzip, z. B. optisch oder magnetisch, die durch die radialen Teilungsstriche 11 gebildete Inkrementalteilung ab, so dass eine Drehbewegung der Codescheibe 1 bzw. der mit der Codescheibe 1 drehfest verbundenen Welle 2 bezüglich der Abtasteinheit 3 erfassbar und in ihrem Ausmaß bestimmbar ist. Für weitere Einzelheiten zu den hierbei verwendeten Messprinzipien wird auf das Fachbuch von Alfons Ernst, Digitale Längen- und Winkelmesstechnik: Positionsmesssysteme für den Maschinenbau und die Elektroindustrie, 3. Aufl. (Landsberg/Lech 1998) verwiesen. Dort sind sowohl der grundsätzliche Aufbau einer Codescheibe mit Inkrementalteilung als auch die zur Abtastung einer Codescheibe geeigneten physikalischen Messprinzipien beschrieben.With a rotational movement D of the shaft 2 leads therefore the code disc 1 a same rotational movement D around those with their center 20 coinciding axis of rotation. For detecting and measuring this rotational movement D serve the a periodic incremental graduation, arranged in the circumferential direction U behind one another and radially extending first graduation marks 11 the first trace of the material measure 11 . 12 , This is due to the radially extending graduation lines 11 formed radial division (incremental division) in a known manner by means of one of the code disk 1 associated scanning unit 3 scanned, the present two in the direction of rotation D or circumferential direction U of the code disc 1 at a angular distance of 90 ° successively arranged scanning heads 31 . 32 includes. At least one of these scanheads 31 . 32 the scanning unit 3 tatstet in a known manner for a suitable physical measuring principle, eg. As optical or magnetic, by the radial graduation lines 11 formed incremental pitch, so that a rotational movement of the code disc 1 or the one with the code disk 1 rotatably connected shaft 2 with respect to the scanning unit 3 detectable and determinable in their extent. For further details on the measurement principles used here, reference is made to the textbook by Alfons Ernst, Digital Length and Angle Measurement: Positioning Systems for Mechanical Engineering and the Electrical Industry, 3rd ed. (Landsberg / Lech 1998). There, both the basic structure of a code disk with incremental pitch and the physical measuring principles suitable for scanning a code disk are described.

Die Messrichtung M, entlang der die Drehbewegung D der Welle 2 sowie der hiermit verbundenen Codescheibe 1 gemessen wird, fällt dabei – ebenso wie die Drehrichtung – mit der Umfangsrichtung U des äußeren Randes 15 der Codescheibe 1 zusammen. Die einzelnen Teilungsstriche 11 der durch eine Radialteilung gebildeten Inkrementalteilung erstrecken sich somit jeweils senkrecht zur Messrichtung M und sind in Messrichtung M hintereinander angeordnet und dabei voneinander beabstandet. The measuring direction M, along the rotational movement D of the shaft 2 and the associated code disc 1 is measured, it falls - as well as the direction of rotation - with the circumferential direction U of the outer edge 15 the code disc 1 together. The individual graduation marks 11 the incremental pitch formed by a radial graduation thus each extend perpendicularly to the measuring direction M and are arranged one behind the other in the measuring direction M and in this case are spaced apart from one another.

Neben der vorbeschriebenen, als Inkrementalteilung ausgebildeten ersten Spur, die aus einer Vielzahl radial erstreckter Teilungsstriche 11 besteht, weist die Maßverkörperung 11, 12 der Codescheibe 1 eine zweite Spur auf, welche aus den in Umfangsrichtung U bzw. Messrichtung M umlaufenden und in radialer Richtung R hintereinander angeordneten sowie äquidistant voneinander beabstandeten Teilungsstrichen 12 gebildet wird. Durch Abtastung dieser zweiten Spur, bei der es sich ebenfalls um eine Inkrementalspur handelt, mittels beider Abtastköpfe 31, 32 lassen sich Verlagerungen der Antriebswelle 2 und damit der Codescheibe 1 in der xy-Ebene erfassen, in der die Codescheibe 1 angeordnet ist. Hierzu ist von Bedeutung, dass die beiden Abtastköpfe 31, 32 der Abtasteinheit 3 derart voneinander beabstandet angeordnet sind, dass sie die Bestimmung radialer Verlagerungen der Welle 2 sowie der Codescheibe 1 entlang zweier voneinander linear unabhängiger Raumrichtungen in der von der Codescheibe 1 aufgespannten Ebene ermöglichen. Vorliegend handelt es sich bei den beiden Raumrichtungen wegen des Winkelabstandes von 90° zwischen den beiden Abtastköpfen 31, 32 um zwei zueinander senkrechte Achsen x und y. Hinsichtlich geeigneter Abtastköpfe 31, 32 zur Abtastung der Maßverkörperung 11, 12 der Codescheibe 1 wird beispielhaft auf die EP 0 482 224 B1 verwiesen.In addition to the above-described, formed as an incremental graduation first track, which consists of a plurality of radially extending graduation lines 11 exists, rejects the material measure 11 . 12 the code disc 1 a second track, which from the circumferential in the circumferential direction U or measuring direction M and arranged in the radial direction R successively arranged and equidistantly spaced apart graduation marks 12 is formed. By scanning this second track, which is also an incremental track, using both scanheads 31 . 32 can be displacements of the drive shaft 2 and thus the code disc 1 in the xy plane, in which the code disk 1 is arranged. For this it is important that the two scanning heads 31 . 32 the scanning unit 3 are spaced apart such that they determine the radial displacements of the shaft 2 as well as the code disc 1 along two mutually linearly independent spatial directions in that of the code disk 1 enable spanned level. In the present case, the two spatial directions are due to the angular spacing of 90 ° between the two scanning heads 31 . 32 around two mutually perpendicular axes x and y. With regard to suitable scanning heads 31 . 32 for scanning the material measure 11 . 12 the code disc 1 is exemplary on the EP 0 482 224 B1 directed.

Wie anhand der Figur deutlich wird, ragen die in Umfangsrichtung U erstreckten Teilungsstriche 12 der zweiten Spur in radialer Richtung R nicht über die radial erstreckten Teilungsstriche 11 der ersten Spur hinaus. Somit erfordert die Verwirklichung einer zweiten Spur, mit der sich radiale Verlagerungen bzw. Exzentrizitäten erfassen lassen, keinen zusätzlichen Platzbedarf auf dem Codeträger 10 der Codescheibe 1.As is clear from the figure, the graduation lines extending in the circumferential direction U protrude 12 the second track in the radial direction R not over the radially extending graduation lines 11 the first track out. Thus, the realization of a second track, with which radial displacements or eccentricities can be detected, requires no additional space on the code carrier 10 the code disc 1 ,

Von Bedeutung ist dabei ferner, dass ein und dieselben Abtastköpfe 31, 32 zur Erfassung sowohl der ersten Spur als auch der zweiten Spur der Maßverkörperung 11, 12 dienen können, wobei zur Abtastung der aus den radialen Teilungsstrichen 11 bestehenden ersten Spur an sich ein einzelner Abtastkopf ausreicht; die Verwendung zweier Abtastköpfe 31, 32 ermöglicht jedoch die Erfassung radialer Verlagerungen der Welle 2 sowie der Codescheibe 1 in allen Raumrichtungen in der senkrecht zur Welle 2 verlaufenden xy-Ebene.It is also important that one and the same scanning heads 31 . 32 to capture both the first track as well as the second track of the material measure 11 . 12 can serve, with the sampling of the radial graduation lines 11 existing single track is sufficient in itself a single scanhead; the use of two scanning heads 31 . 32 However, allows the detection of radial displacements of the shaft 2 as well as the code disc 1 in all spatial directions in the direction perpendicular to the shaft 2 extending xy plane.

Claims (12)

Positionsmesseinrichtung zur Bestimmung der Winkellage zweier zueinander beweglicher Objekte mit – einer Maßverkörperung, die einem der beiden Objekte zuzuordnen ist, – einer der Ermittlung der Winkellage dienenden ersten Spur der Maßverkörperung, die eine Vielzahl radial bezüglich eines Mittelpunktes der Maßverkörperung erstreckter, entlang einer Messrichtung hintereinander angeordneter Teilungsstriche aufweist, – mindestens einer der Erfassung radialer Verlagerungen der Maßverkörperung dienenden zweiten Spur der Maßverkörperung, die eine Mehrzahl entlang der Messrichtung umlaufender, in radialer Richtung hintereinander angeordneter Teilungsstriche aufweist, und – einer Abtasteinheit, die dem anderen der beiden Objekte zuzuordnen ist und die Abtastmittel zur Abtastung beider Spuren der Maßverkörperung aufweist, dadurch gekennzeichnet, dass die beiden Spuren der Maßverkörperung (11, 12) einander überlagert sind, so dass sich deren Teilungsstriche (11, 12) schneiden.Position measuring device for determining the angular position of two mutually movable objects with - a material measure, which is assigned to one of the two objects, - one of the determination of the angular position serving first track of the material measure, a plurality of radially with respect to a center of the measuring standard extended, along a measuring direction arranged one behind the other Dividing lines comprises, - at least one of the detection of radial displacements of the measuring scale serving second track of the measuring scale, which has a plurality along the measuring direction circumferential, arranged in radial direction one behind the other graduation graduations, and - a scanning unit, which is assigned to the other of the two objects and the scanning means for scanning both tracks of the material measure, characterized in that the two tracks of the material measure ( 11 . 12 ) are superimposed on each other so that their graduation lines ( 11 . 12 ) to cut. Positionsmesseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die radial erstreckten Teilungsstriche (11) der ersten Spur sämtliche in Messrichtung (M) erstreckten Teilungsstriche (12) der zweiten Spur schneiden.Position measuring device according to claim 1, characterized in that the radially extending graduation lines ( 11 ) of the first track all in the measuring direction (M) extending graduation lines ( 12 ) of the second track. Positionsmesseinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Teilungsstriche (12) der zweiten Spur in radialer Richtung (R) nicht über die Teilungsstriche (11) der ersten Spur hinausragen.Position measuring device according to claim 1 or 2, characterized in that the graduation lines ( 12 ) of the second track in the radial direction (R) not over the graduation lines ( 11 ) protrude the first track. Positionsmesseinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die in Messrichtung (M) erstreckten Teilungsstriche (12) der zweiten Spur jeweils entlang einer Kreisbahn um den Mittelpunkt (20) der Maßverkörperung umlaufen und dass die radial erstreckten Teilungsstriche (11) der ersten Spur in radialer Richtung (R) bezüglich der Teilungsstriche (12) der zweiten Spur verlaufen.Position measuring device according to one of the preceding claims, characterized in that in the measuring direction (M) extending graduation lines ( 12 ) of the second track each along a circular path around the center ( 20 ) of the measuring scale and that the radially extending graduation lines ( 11 ) of the first track in the radial direction (R) with respect to the graduation lines ( 12 ) of the second lane. Positionsmesseinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die radial erstreckten Teilungsstriche (11) der ersten Spur zur Bildung einer Inkrementalteilung in Umfangsrichtung (U) äquidistant hintereinander angeordnet sind.Position measuring device according to one of the preceding claims, characterized in that the radially extending graduation lines ( 11 ) of the first track to form an incremental graduation in the circumferential direction (U) are arranged equidistantly one behind the other. Positionsmesseinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die in Umfangsrichtung (U) erstreckten Teilungsstriche (12) der zweiten Spur in radialer Richtung (R) äquidistant hintereinander angeordnet sind.Position measuring device according to one of the preceding claims, characterized in that in the circumferential direction (U) extending graduation lines ( 12 ) of the second track in the radial direction (R) are arranged equidistantly behind one another. Positionsmesseinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die beiden Spuren (11, 12) der Maßverkörperung auf einem scheibenförmigen Codeträger (10) vorgesehen sind.Position measuring device according to one of the preceding claims, characterized in that the two tracks ( 11 . 12 ) of the material measure on a disk-shaped code carrier ( 10 ) are provided. Positionsmesseinrichtung nach Anspruch 8, dadurch gekennzeichnet, dass der Codeträger (10) kreisscheibenförmig ausgebildet ist.Position measuring device according to claim 8, characterized in that the code carrier ( 10 ) is circular disk-shaped. Positionsmesseinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das eine der zueinander beweglichen Objekte durch eine drehbare Welle (2) gebildet wird, an der die Maßverkörperung (11, 12) derart drehfest angeordnet ist, dass sich die Teilungsstriche (11) der ersten Spur radial bezüglich der Welle (2) erstrecken und die Teilungsstriche (12) der zweiten Spur die Welle (2) konzentrisch umfassen.Position measuring device according to one of the preceding claims, characterized in that the one of the mutually movable objects by a rotatable shaft ( 2 ) is formed, at which the material measure ( 11 . 12 ) is arranged rotatably such that the graduation lines ( 11 ) of the first track radially with respect to the shaft ( 2 ) and dividing lines ( 12 ) the second track the wave ( 2 ) concentrically. Positionsmesseinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Abtasteinheit (3) zur Abtastung beider Spuren (11, 12) der Maßverkörperung mindestens zwei Abtastköpfe (31, 32) aufweist, die in Messrichtung (M) voneinander beabstandet angeordnet sind.Position measuring device according to one of the preceding claims, characterized in that the scanning unit ( 3 ) for scanning both tracks ( 11 . 12 ) of the measuring scale at least two scanning heads ( 31 . 32 ), which are arranged in the measuring direction (M) spaced from each other. Positionsmesseinrichtung nach Anspruch 11, dadurch gekennzeichnet, dass die Abtastköpfe (31, 32) in einem Winkelabstand von 90° vorgesehen sind.Position measuring device according to claim 11, characterized in that the scanning heads ( 31 . 32 ) are provided at an angular distance of 90 °. Positionsmesseinrichtung nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass die Abtasteinheit (3) genau zwei in Messrichtung (M) voneinander beabstandete Abtastköpfe (31, 32) aufweist.Position measuring device according to claim 11 or 12, characterized in that the scanning unit ( 3 ) exactly two in the measuring direction (M) spaced scanning heads ( 31 . 32 ) having.
DE200520001834 2005-02-02 2005-02-02 Position measurement arrangement for measuring the relative angular positions of two objects rotating relative to each other has a coding disk with overlapping radial and circumferential markings of two separate measurement tracks Expired - Lifetime DE202005001834U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200520001834 DE202005001834U1 (en) 2005-02-02 2005-02-02 Position measurement arrangement for measuring the relative angular positions of two objects rotating relative to each other has a coding disk with overlapping radial and circumferential markings of two separate measurement tracks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200520001834 DE202005001834U1 (en) 2005-02-02 2005-02-02 Position measurement arrangement for measuring the relative angular positions of two objects rotating relative to each other has a coding disk with overlapping radial and circumferential markings of two separate measurement tracks

Publications (1)

Publication Number Publication Date
DE202005001834U1 true DE202005001834U1 (en) 2005-04-21

Family

ID=34485855

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200520001834 Expired - Lifetime DE202005001834U1 (en) 2005-02-02 2005-02-02 Position measurement arrangement for measuring the relative angular positions of two objects rotating relative to each other has a coding disk with overlapping radial and circumferential markings of two separate measurement tracks

Country Status (1)

Country Link
DE (1) DE202005001834U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010046251A1 (en) * 2010-09-22 2012-03-22 Leopold Kostal Gmbh & Co. Kg Rotational position measuring device for rotor, has magnetic sensor arranged around specified range opposite to optical code-disk sensor, and evaluation unit determining measurement for displacement of rotor from output signals of sensors
DE102013221143B4 (en) * 2013-10-17 2025-12-04 Dr. Johannes Heidenhain Gmbh Position measuring device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010046251A1 (en) * 2010-09-22 2012-03-22 Leopold Kostal Gmbh & Co. Kg Rotational position measuring device for rotor, has magnetic sensor arranged around specified range opposite to optical code-disk sensor, and evaluation unit determining measurement for displacement of rotor from output signals of sensors
DE102013221143B4 (en) * 2013-10-17 2025-12-04 Dr. Johannes Heidenhain Gmbh Position measuring device

Similar Documents

Publication Publication Date Title
DE19628765B4 (en) Method and device for determining the position of non-rectilinearly moving, in particular rotating machine parts
EP1923670B1 (en) Position measuring device
DE102008043556B4 (en) position measuring device
EP0268558B1 (en) Apparatus for measuring lengths or angles
EP3764064B1 (en) Optical positioning device
EP2063230B1 (en) Optical positioning device
EP0171612A1 (en) Position-measuring apparatus
DE4301971A1 (en)
EP0137099A1 (en) Measuring apparatus
EP1271107B1 (en) Position measuring device
DE19907326A1 (en) Angle measurement system, without complex bearing arrangement has sampling units settled about possible errors, resulting due to mismatch of rotational axis of object with that of measurement division
EP1798523B1 (en) Measuring device for simultaneously determining a rotation angle and a displacement position
DE102013110808A1 (en) Displacement detection device
EP1632754B1 (en) Method and device for precise determination of an angle of rotation
EP2674731B1 (en) Position measuring device
EP0325924B1 (en) Roundness standard
DE3320983A1 (en) TRANSPORTABLE DEVICE FOR CHECKING THE TOOTHED FRAME PROFILE AND TOOTHED FLANGE LINES (TOOTH SLOPES) OF GEARS ON TOOTHING MACHINES OR TOOTHED FRAME GRINDING MACHINES, AND FOR POSITIONING THIS MACHINE AND THE ORGANIZING DEVICE AND THE ORAING MACHINE
DE202005001834U1 (en) Position measurement arrangement for measuring the relative angular positions of two objects rotating relative to each other has a coding disk with overlapping radial and circumferential markings of two separate measurement tracks
DE4402401C2 (en) Angle measuring device with several scanning points
EP0341412A1 (en) Position coded angle sensor
EP0699896A2 (en) Step motor with position sensor
EP1724548B1 (en) Position measuring device
DE202016005708U1 (en) Gear measuring device
EP1350420B1 (en) Device for positioning a component picking unit of a pcb assembly machine for printed circuit boards
EP0628785A2 (en) Multi-coordinates feeler head

Legal Events

Date Code Title Description
R207 Utility model specification

Effective date: 20050525

R150 Utility model maintained after payment of first maintenance fee after three years

Effective date: 20080229

R151 Utility model maintained after payment of second maintenance fee after six years

Effective date: 20110225

R152 Utility model maintained after payment of third maintenance fee after eight years

Effective date: 20130227

R071 Expiry of right
R071 Expiry of right