WO2015090846A1 - Système de détection pour un dispositif de mesure de position absolu - Google Patents

Système de détection pour un dispositif de mesure de position absolu Download PDF

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Publication number
WO2015090846A1
WO2015090846A1 PCT/EP2014/075246 EP2014075246W WO2015090846A1 WO 2015090846 A1 WO2015090846 A1 WO 2015090846A1 EP 2014075246 W EP2014075246 W EP 2014075246W WO 2015090846 A1 WO2015090846 A1 WO 2015090846A1
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WO
WIPO (PCT)
Prior art keywords
sensor arrangement
curves
arrangement according
transmitter coil
winding
Prior art date
Application number
PCT/EP2014/075246
Other languages
German (de)
English (en)
Inventor
Johannes Muehlfeld
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 WO2015090846A1 publication Critical patent/WO2015090846A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
    • G01D5/225—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils

Definitions

  • the inductive measurement is strongly offset-related in principle. Namely, only the signal component by which the received signal is modulated by the external influences fluctuates as the useful signal. Typically, the proportion of the useful signal is only about 1% o to max. 10% of the total signal. The rest of the signal is offset and i.d.R. undesirable.
  • a sensor arrangement comprises a plurality of individual sensors, advantageously the individual sensors each have one transmitter coil and one receiver coil each.
  • Sensor arrangements comprising more than one individual sensor can also be produced very simply within the scope of the invention.
  • each transmitter sensor may be associated with a transmitter coil, which nevertheless are all connected in series. To provide the two winding regions with opposite winding sense, therefore, only a few layers of a multilayer arrangement are required for a plurality of individual sensors. This reduces the number of required vias.
  • the differential transmitter coil structure requires only a few vias (in series connection only 1). These are only at the extreme ends, where enough space is available. For the realization of the differential transmitter coil structure therefore no particularly fine feature sizes are required.
  • adjacent winding areas in the measuring direction also have opposite winding directions if they belong to different individual sensors.
  • an influence of adjacent markers in the measuring direction when reading a single sensor is reduced.
  • the transmitter coils are formed as meander turns, in particular galvanically separated in at least two layers one above the other.
  • a meandering turn is a turn that alternately has one or more right turns and one or more left turns.
  • the curves may be curved or angular, with straight areas between the curves.
  • Windings with opposite sense of winding or windings for closing open meandering sides can be formed by a further conductor track in a further layer without the conductor tracks of the different layers intersecting in an electrically conductive manner. This allows an execution in only two layers and thus a simple and thin design.
  • An absolute position measuring device with an absolute measuring standard and a scanning head with a sensor arrangement according to the invention comprises an absolute measuring graduation on which markings are formed in the measuring direction, wherein a marking represents one of at least two, in particular also at least four, different information states.
  • FIG. 1 shows schematically a sensor arrangement for an absolute position measuring device in a first preferred embodiment.
  • FIG. 2 schematically shows a sensor arrangement for an absolute position-measuring device in a second preferred embodiment.
  • FIG. 3 schematically shows an absolute measuring standard for an absolute position measuring device in a preferred embodiment.
  • Two meander turns 31 and 32 together form the transmitter coils 30, with the two meander turns formed in the two different layers (A) and (B) of the multilayer assembly.
  • the two meander turns 31, 32 are shown next to one another, but in a practical embodiment they lie one above the other. The exact position is indicated by the reference symbols a, b, c.
  • the two meandering windings 31, 32 and thus the transmitter coils 30 in a practical embodiment above or below the receiver coils 40. The exact location is again indicated by the reference numerals a, b, c.
  • Each of the meander turns 31, 32 has alternately three right-hander curves and three left-hander curves, of which two angular 90 curves and one angular one are about 45 -curve. Between the curves lie straight areas. Contrary to the illustration, the transmitter coils 30 preferably have a plurality of winding turns.
  • l (t) is a transmitter current referred to, the transmitter coils 30 and the two meander turns 31, 32 flows through. It can be seen from the arrows to l (t) that the two meander windings 31, 32 are flowed through by the transmitter current such that two windings which are assigned to a receiver coil 40 are flowed through in opposite directions. In the receiver coils 40 at the bottom in the middle, this is indicated by way of example with the first effective circular current 42 and the second effective circular current 43.
  • a single sensor is thus formed according to the example shown from a receiver coil 40 and two windings of a transmitter coil 30, which are stacked in layers, i. For example, above the area designated a, are arranged. Further, an intersecting portion 36 of the transmitter coils 30 is shown, which is an area in which the winding sense of a meandering turn changes and the meandering turns 31 and 32 intersect, but in different layers, i. there is no electrical contact.
  • adjacent winding regions of the transmitter coils of different individual sensors (which are formed by different meandering windings, eg 37a, 37b) also have different winding directions in the measuring direction.
  • a transmitter alternating current eg 100 kHz
  • a receiver coil 40 are each assigned two effective circular currents with opposite direction. These each induce an alternating voltage in the receiver coil 40.
  • the receiver coils 40 At the top and bottom of the receiver coils 40 is indicated that these, as well as the transmitter coils 30, in each case by a distance 35 over the maximum width (across the measuring direction 1 1) of the markers 51 survive. This ensures that a possible slight displacement of a sensor arrangement 20 of individual coils (virtually always only together with the entire absolute sensor arrangement) in a direction transverse to the measuring direction 1 1 has no influence on a change in the voltage induced in a receiver coil 40 voltage signal since the mark is still covered by the receiver coil 40.
  • the reference numeral 41 denotes connections of the receiver coils to an evaluation unit
  • the reference numeral 34 designates connections of the transmitter windings 30 to this or another evaluation unit from which they are supplied with voltage.
  • the meandering turns can extend beyond the receiver coils 40, i.
  • Transmitter coils would be formed which create a field, but this will not affect a receiver coil.
  • These additional transmitter coils also referred to as compensation coils, serve to homogenize the field generated by the transmitter coils. Over the last receiver coil, the field thus behaves as over a receiver coil within the transmitter. Without the compensation coils, the field at the edge region would change and the voltage signals generated in the receiver coils would be unclear.
  • FIG. 2 schematically shows a sensor arrangement 20 for an absolute position-measuring device in a second preferred embodiment.
  • the sensor array 20 five individual sensors in the measuring direction 1 1 side by side, of which three are denoted by the reference numerals a, b, c.
  • transmitter coils 30 are shown.
  • Four meander turns 31 and 32 each form part of the transmitter coils 30, wherein the four meander turns 31, 32 are formed in two different layers (B), (A).
  • two meander turns (31 in A; 32 in B) are arranged side by side transversely to the measuring direction.
  • the two pairs 31, 32 in the two layers (B), (A) are shown offset one above the other, but in practical implementation these layers lie one above the other.
  • the meandering windings 31, 32 and thus the transmitter coils 30 are in a practical embodiment above or below the receiver coils 40.
  • Below in Figure 2 is a superposition of the three layers (A), (B), (C) is shown.
  • the mode of operation of the sensor arrangement in FIG. 2 corresponds to that which has been described for the sensor arrangement in the first preferred embodiment to FIG.
  • the reference numeral 33 through holes are marked, with the meandering fertilize 31 and 32 are interconnected.
  • the reference numeral 41 designates connections of the receiver coils to an evaluation unit
  • the reference numeral 34 designates connections of the transmitter coils 30 to the same or another evaluation unit from which they are supplied with voltage.
  • the upper meandering turn 31 in the figure is connected to the upper meandering turn 32 at 33 in the figure and connected in series
  • the lower meandering turn 31 in the figure is connected to the lower meandering turn 32 at 33 in the figure and connected in series. Due to the series connection, the same current flows in all transmitter windings, whereby the generated fields for all individual sensors and winding areas amount- are moderately equal.
  • Each of the meander turns 31, 32 alternately has two right-hand curves and two left-hand turns, which are approximately 90 angular curves. Between the curves lie straight areas.
  • a single sensor a, b, c is formed from a receiver coil 40 and two winding regions 37, 38 of the meandering windings 31, 32, which are arranged transversely to the measuring direction 1 1 side by side.
  • FIG. 3 schematically shows an absolute material measure 50 in a preferred embodiment.
  • 1 marks 51 of length ⁇ are formed.
  • a marker 51 represents one of two different states of information, depending on whether the marker 51 is formed at the top or the bottom (with respect to FIG. 3).
  • the material measure 50 is in particular a photochemically etched metal strip of ferromagnetic material, preferably stainless ferritic steel, in question.
  • the marks 51 are preferably made as rectangular holes in the metal strip.
  • the markers 51 can all have the same shape and size. However, different sizes are also conceivable, in particular with regard to the width across
  • Measuring direction depending on the number of different information states that can be displayed. Instead of holes, it is also possible to provide solid, non-ferromagnetic material. This is a possible embodiment of the absolute material measure, but there are also other embodiments, in particular with regard to the number of possible information states that can be displayed with a marker and distances of the markings to each other, possible.
  • the induction effect weakens, so that the two induced voltages no longer cancel each other out.
  • the receiver coil then there is an induced alternating voltage whose amplitude represents the information state.
  • eddy currents are also induced in the material measure 50, which counteract the above effect exactly. Since the material measure is preferably made of stainless steel with low electrical conductivity, but these are low. Finally, at the lower and upper edge of the material measure 50, a first longitudinal web 53 and a second longitudinal web 54 are formed, whereby the material measure stability is given.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un système de détection (20) pour une tête de balayage mobile pour un dispositif de mesure de position absolu doté d'une mesure matérialisée (50) absolue, ladite tête de balayage servant à balayer la mesure matérialisée (50) absolue dans une direction de mesure (11), le système de détection (20) présentant au moins une bobine émettrice (30) et au moins une bobine réceptrice (40), ladite au moins une bobine émettrice (30) comprenant deux zones d'enroulement (37, 38) à sens d'enroulement opposé.
PCT/EP2014/075246 2013-12-17 2014-11-21 Système de détection pour un dispositif de mesure de position absolu WO2015090846A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013226202.7 2013-12-17
DE102013226202.7A DE102013226202A1 (de) 2013-12-17 2013-12-17 Sensoranordnung für eine absolute Positionsmessvorrichtung

Publications (1)

Publication Number Publication Date
WO2015090846A1 true WO2015090846A1 (fr) 2015-06-25

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DE (1) DE102013226202A1 (fr)
WO (1) WO2015090846A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0305591A2 (fr) * 1982-05-13 1989-03-08 C.A. Weidmüller GmbH & Co. Capteur inductif et dispositif de mesure utilisant ce capteur
US6271661B2 (en) 1999-03-16 2001-08-07 Mitutoyo Corporation Absolute position transducer having a non-binary code-track-type scale
WO2008047001A2 (fr) * 2006-10-16 2008-04-24 Nanotec Solution Dispositif inductif de mesure de la position d'une cible, et procede mis en oeuvre par ce dispositif
FR2947048A1 (fr) * 2009-06-23 2010-12-24 Electricifil Automotive Capteur de position angulaire.
DE102010041444A1 (de) * 2010-09-27 2012-03-29 Robert Bosch Gmbh Geberrad einer Sensoranordnung zum Erfassen eines Drehwinkels und/oder einer Drehzahl einer Welle, Drehwinkel- und/oder Drehzahlsensor und Sensoranordnung
EP2502030B1 (fr) 2009-11-18 2013-03-13 Victor Vasiloiu Dispositif de mesure inductif pour l'acquisition de longueur et d'angle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5841274A (en) * 1997-01-29 1998-11-24 Mitutoyo Corporation Induced current absolute position transducer using a code-track-type scale and read head
JP3668406B2 (ja) * 2000-03-13 2005-07-06 株式会社ミツトヨ 電磁誘導型位置検出装置
EP1378725B1 (fr) * 2002-07-03 2010-05-19 Hans Ulrich Meyer Capteur inductif de position

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0305591A2 (fr) * 1982-05-13 1989-03-08 C.A. Weidmüller GmbH & Co. Capteur inductif et dispositif de mesure utilisant ce capteur
US6271661B2 (en) 1999-03-16 2001-08-07 Mitutoyo Corporation Absolute position transducer having a non-binary code-track-type scale
WO2008047001A2 (fr) * 2006-10-16 2008-04-24 Nanotec Solution Dispositif inductif de mesure de la position d'une cible, et procede mis en oeuvre par ce dispositif
FR2947048A1 (fr) * 2009-06-23 2010-12-24 Electricifil Automotive Capteur de position angulaire.
EP2502030B1 (fr) 2009-11-18 2013-03-13 Victor Vasiloiu Dispositif de mesure inductif pour l'acquisition de longueur et d'angle
DE102010041444A1 (de) * 2010-09-27 2012-03-29 Robert Bosch Gmbh Geberrad einer Sensoranordnung zum Erfassen eines Drehwinkels und/oder einer Drehzahl einer Welle, Drehwinkel- und/oder Drehzahlsensor und Sensoranordnung

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