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DE102007020158A1 - Rotation angle-sensor arrangement for detecting rotatary movements of measuring object, has magnet with cross section that constantly changes in circumferential direction, and magneto-sensitive sensor arranged at front surface of magnet - Google Patents

Rotation angle-sensor arrangement for detecting rotatary movements of measuring object, has magnet with cross section that constantly changes in circumferential direction, and magneto-sensitive sensor arranged at front surface of magnet Download PDF

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Publication number
DE102007020158A1
DE102007020158A1 DE102007020158A DE102007020158A DE102007020158A1 DE 102007020158 A1 DE102007020158 A1 DE 102007020158A1 DE 102007020158 A DE102007020158 A DE 102007020158A DE 102007020158 A DE102007020158 A DE 102007020158A DE 102007020158 A1 DE102007020158 A1 DE 102007020158A1
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Germany
Prior art keywords
magnet
magneto
sensor arrangement
circumferential direction
cross
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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Withdrawn
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DE102007020158A
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German (de)
Inventor
Daniel Dobler
Alexander Moosmann
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.)
Hirschmann Automotive GmbH
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Hirschmann Automotive GmbH
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Priority to DE102007020158A priority Critical patent/DE102007020158A1/en
Publication of DE102007020158A1 publication Critical patent/DE102007020158A1/en
Withdrawn legal-status Critical Current

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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
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/70—Position sensors comprising a moving target with particular shapes, e.g. of soft magnetic targets
    • G01D2205/77—Specific profiles
    • G01D2205/775—Tapered profiles
    • 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
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/70—Position sensors comprising a moving target with particular shapes, e.g. of soft magnetic targets
    • G01D2205/77—Specific profiles
    • G01D2205/777—Whorl-shaped profiles

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

The arrangement has a magnet (1) and a magneto-sensitive sensor (3) e.g. Hall sensor, where the magnet is embedded in a magnetic field generator (2) and formed in a circular manner. The magnet has a cross section, which constantly changes in a circumferential direction. The sensor is arranged at a front surface of the magnet, which points in a direction parallel to a rotation axis of the magnet. The field generator is formed as a separate component, and is made of plastic material.

Description

Die Erfindung betrifft eine Sensoranordnung, die zur Erfassung rotatorischer Bewegungen von Messobjekten ausgebildet ist, mit zumindest einem Magneten sowie einem magnetosensitiven Sensor, gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1.The The invention relates to a sensor arrangement which is rotatable for detecting Movements of measuring objects is formed, with at least one magnet and a magneto-sensitive sensor, according to the features of the preamble of claim 1.

Solche Drehwinkel-Sensoranordnungen, die auf magnetosensitiver Basis, insbesondere mittels Hall-Sonden, funktionieren, sind grundsätzlich bekannt. Derzeit werden insbesondere große zu erfassende Winkelbereiche (zum Beispiel 270 Grad) nur mit aufwendigen und kostenintensiven Drehwinkel-Systemen realisiert. Außerdem sind für die Abdeckung solch großer Winkelbereiche mehr als nur ein magnetosensitiver Sensor erforderlich.Such Angular-angle sensor arrangements based on magneto-sensitive, in particular using Hall probes, work, are basically known. Currently especially big to be detected angle ranges (for example, 270 degrees) only with elaborate and cost-intensive rotation angle systems realized. Besides, they are for the Cover such great Angular ranges more than just a magneto-sensitive sensor required.

Der Erfindung liegt die Aufgabe zugrunde, eine Sensoranordnung, die zur Erfassung rotatorischer Bewegungen von Messobjekten ausgebildet ist, bereit zu stellen, die auch große Winkelbereiche ohne hohen Aufwand und kostengünstig erfassbar macht.Of the Invention is based on the object, a sensor arrangement, the is designed for detecting rotational movements of measuring objects, to provide, which is also great Angle areas without high effort and cost makes detectable.

Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöst.These The object is solved by the features of claim 1.

Erfindungsgemäß ist vorgesehen, dass der Magnet in einem Magnetfeldgeber eingebettet und kreisförmig ausgebildet ist, wobei sich der Querschnitt des Magneten in Umfangsrichtung stetig ändert. Damit ist es möglich, mit nur einer Drehbewegung (über 360 Grad) oder auch mehreren Drehbewegungen, die aufeinander folgen, einen entsprechend großen Winkelbereich zu erfassen. Gleichzeitig bleibt der Aufbau der Sensoranordnung einfach und kostengünstig, da der Magnet (entweder ein permanenter Dauermagnet aus metallischem Werkstoff oder Kunststoff oder einer entsprechenden Legierung oder ein Elektromagnet) geschützt in dem Magnetfeldgeber eingebettet ist. Dadurch ist es ohne weiteres möglich, den Magnetfeldgeber an dem Messobjekt zu befestigen, wobei es alternativ auch denkbar ist, dass das Messobjekt selber den Magnetfeldgeber bildet. In vorteilhafter Weise ist der Magnetfeldgeber aus Spritzgegossenen Kunststoff hergestellt und wird als separate Einheit an dem Messobjekt befestigt oder schon mit der Herstellung des Messobjektes selber hergestellt.According to the invention, it is provided that the magnet embedded in a magnetic encoder and formed circular is, wherein the cross section of the magnet in the circumferential direction constantly changing. This makes it possible with only one turning movement (over 360 degrees) or several rotational movements that follow each other, a correspondingly large To capture angle range. At the same time, the structure of the sensor arrangement remains simple and inexpensive, because the magnet (either a permanent permanent magnet of metallic Material or plastic or a corresponding alloy or an electromagnet) protected is embedded in the magnetic encoder. It's easy by doing so possible, to attach the magnetic encoder to the measurement object, where it is alternative It is also conceivable that the measurement object itself the magnetic field transmitter forms. Advantageously, the magnetic encoder is injection molded Made of plastic and is used as a separate unit on the test object fixed or already with the production of the measurement object itself produced.

Weiterhin ist erfindungswesentlich, dass sich der Querschnitt des Magneten in Umfangsrichtung stetig ändert. Dabei wird je nach Signalauswertung der sich in Umfangsrichtung stetig ändernde Querschnitt so gewählt, dass er sich in Umfangsrichtung, also in seinem radialen Verlauf, stetig linear oder alternativ stetig nicht linear verändert. Dies hat zur Folge, dass sich das Ausgangssignal des magnetosensitiven Sensors, beispielsweise der Hall-Sonde, je nach Drehrichtung ansteigt oder abfällt, bis es zu einem Sprung kommt, bei dem sich der Verlauf des Ausgangssignals wieder umkehrt.Farther is essential to the invention that the cross section of the magnet constantly changes in the circumferential direction. Depending on the signal evaluation, this will be in the circumferential direction constantly changing Cross section chosen so that he is in the circumferential direction, ie in its radial course, continuously linear or alternatively non-linearly varied. This As a result, the output signal of the magneto-sensitive Sensor, for example, the Hall probe, depending on the direction of rotation increases or drops off, until it comes to a jump, in which the course of the output signal reversed again.

Mit der erfindungsgemäßen Anordnung können somit Winkelbereiche bis zu 360 Grad bei einfachem Aufbau der Anordnung gemessen werden.With the inventive arrangement can thus angle ranges up to 360 degrees with a simple structure of the arrangement be measured.

Eine bevorzugte Anwendung ist in der Fahrzeugtechnik zu sehen, hier insbesondere bei Personen- oder Lastkraftwagen, genauso wie bei Arbeitsfahrzeugen (automotive Winkelmaessung). Beispielhaft sei die Messung des Anstellwinkels einer Heckklappe eines Personenkraftwagens genannt. Mit der erfindungsgemäßen Anordnung wird es somit bei vereinfachtem Aufbau ermöglicht, die Stellung der Heckklappe zu ermitteln. Dies ist gerade dann wichtig, um nicht nur die Endstellungen (geschlossen oder geöffnet) zu erfassen, sondern auch eine Vorverraststellung. Diese liegt vor, wenn der Benutzer des Fahrzeuges die Heckklappe nahezu geschlossen hat (die Drehfalle der Heckklappe befindet sich dann in vorveriegelter Stellung) und eine motorbetriebene Anordnung die Heckklappe in ihre geschlossene und damit endgültig verriegelte Position bringt (sogenannte Zuziehhilfe). Gleiches gilt auch für eine motorbetriebene Tür oder Heckklappe, die mittels Motorkraft nicht nur in die geschlossene, sondernauch in die geöffnete Stellung gebracht werden kann.A preferred application is to be seen in vehicle technology, in particular here in passenger cars or trucks, as well as in work vehicles (automotive angle measurement). An example is the measurement of the angle of attack called a tailgate of a passenger car. With the arrangement according to the invention Thus, it is possible with a simplified structure, the position of the tailgate to investigate. This is important then, not just the end positions (closed or open) to capture, but also a Vorverraststellung. This is when the user of the vehicle almost closes the tailgate has (the catch of the tailgate is then in pre-locked Position) and a motorized arrangement the tailgate in her closed and thus final locked position brings (so-called Zuziehhilfe). same for also for a motorized door or tailgate, which by means of engine power not only in the closed, but also in the open Position can be brought.

Zwei Ausführungsbeispiele einer erfindungsgemäßen Sensoranordnung, auf die die Erfindung jedoch nicht beschränkt ist, sind im Folgenden erläutert und anhand der Figuren gezeigt.Two embodiments a sensor arrangement according to the invention, however, to which the invention is not limited are hereinafter explained and shown by the figures.

Es zeigen:It demonstrate:

1: eine Sensoranordnung mit einem Magneten mit sich in Umfangsrichtung stetig ändernden Querschnitt, wobei der magnetosensitive Sensor an der senkrecht zu der Rotationsachse des Magneten weisenden Stirnfläche des Magneten angeordnet ist, 1 a sensor arrangement having a magnet with a continuously changing cross-section in the circumferential direction, wherein the magneto-sensitive sensor is arranged on the end face of the magnet pointing perpendicular to the axis of rotation of the magnet,

2: eine Sensoranordnung mit einem Magneten mit sich in Umfangsrichtung stetig ändernden Querschnitt, wobei der magnetosensitive Sensor an der parallel zu der Rotationsachse des Magneten weisenden Stirnfläche des Magneten angeordnet ist. 2 a sensor arrangement comprising a magnet with a continuously changing cross-section in the circumferential direction, wherein the magneto-sensitive sensor is arranged on the end face of the magnet pointing parallel to the axis of rotation of the magnet.

1 zeigt, soweit im Einzelnen dargestellt, eine Sensoranordnung, die zur Erfassung rotatorischer Bewegungen von Messobjekten (hier nicht näher dargestellt) ausgebildet ist. Es ist ein kreisförmiger Magnet 1 vorhanden, der in einen Magnetfeldgeber 2 eingebettet ist (siehe mittlere Darstellung der 1, Schnitt A-A von der linken Darstellung der 1). In dieser mittleren Darstellung ist erkennbar, dass der Magnet 1 (kreuzschraffiert) in den Magnetfeldgeber 2 (schraffiert) eingebettet ist. Die Stirnflächen senkrecht zu der Rotationsachse des Gebers (gebildet durch die Elemente 1 und 2) ist nicht von dem Magnetfeldgeber 2 umgeben, kann es aber sein. Dieser Stirnfläche des Magneten 1 ist ein magnetosensitiver Sensor 3, beispielsweise ein Hall-Sensor, zugeordnet. Bei Drehung des Messobjektes wird diese rotatorische Bewegung von dem magnetosensitiven Sensor 3 erfasst, der ein beispielhaftes Ausgangssignal abgibt, wie es in der rechten Darstellung der 1 abgebildet ist. Auf der X-Achse ist der Rotationswinkel 4 in Grad und auf der Y-Achse die Amplitude des Ausgangssignals A des magnetosensitiven Sensors 3 abgebildet. In dieser Ausführungsform ist der magnetosensitive Sensor 3 senkrecht zu der Rotationsachse des Magneten (1) weisenden Stirnfläche des Magneten 1 angeordnet. 1 shows, as far as shown in detail, a sensor arrangement, which is designed to detect rotational movements of DUTs (not shown here). It is a circular magnet 1 present in a magnetic field transmitter 2 is embedded (see middle illustration of 1 , Section AA from the left illustration of the 1 ). In this middle illustration it can be seen that the magnet 1 (cross-hatched) in the magnetic field transmitter 2 (hatched) is embedded. The forehead perpendicular to the axis of rotation of the encoder (formed by the elements 1 and 2 ) is not from the magnetic field transmitter 2 but it can be. This end face of the magnet 1 is a magneto-sensitive sensor 3 , For example, a Hall sensor assigned. Upon rotation of the measurement object, this rotational movement of the magneto-sensitive sensor 3 detected, which outputs an exemplary output signal, as shown in the right-hand illustration of 1 is shown. On the X-axis is the rotation angle 4 in degrees and on the Y axis, the amplitude of the output signal A of the magneto-sensitive sensor 3 displayed. In this embodiment, the magneto-sensitive sensor 3 perpendicular to the axis of rotation of the magnet ( 1 ) facing end face of the magnet 1 arranged.

Das bedeutet, dass der magnetosensitive Sensor 3 auch seitlich von dem Magneten 1 angebracht werden kann, wie dies gezeigt ist. Dabei ist dann die Wendelform entsprechend nach außen hin ausgeprägt und die Magnetisierung dementsprechend gewählt.This means that the magneto-sensitive sensor 3 also on the side of the magnet 1 can be attached, as shown. In this case, then the helical shape is pronounced according to the outside and the magnetization selected accordingly.

Als mögliche Ausgangssignale der Sensoranordnung kommen analoge Ausgangsspannungen in Betracht. Daneben ist es denkbar, eine Schnittstelle der Sensoranordnung bereit zu stellen, an der spannungs- oder stromabhängige Pulsweiten modulierte Signale abgegeben werden.When possible Output signals of the sensor arrangement come analog output voltages into consideration. In addition, it is conceivable to have an interface of the sensor arrangement ready to provide at the voltage or current dependent pulse widths modulated signals are emitted.

11
Magnetmagnet
22
Magnetfeldgebermagnetic encoders
33
magnetosensitiver Sensormagneto-sensitive sensor

Claims (7)

Sensoranordnung, die zur Erfassung rotatorischer Bewegungen von Messobjekten ausgebildet ist, mit zumindest einem Magneten (1) sowie einem magnetosensitiven Sensor (3), dadurch gekennzeichnet, dass der Magnet (1) in einem Magnetfeldgeber (2) eingebettet und kreisförmig ausgebildet ist, wobei sich der Querschnitt des Magneten in (1) Umfangsrichtung stetig ändert.Sensor arrangement, which is designed to detect rotational movements of measuring objects, with at least one magnet ( 1 ) and a magneto-sensitive sensor ( 3 ), characterized in that the magnet ( 1 ) in a magnetic field transmitter ( 2 ) is embedded and circular, wherein the cross section of the magnet in ( 1 ) Continuously changes the circumferential direction. Sensoranordnung nach Anspruch 1, dadurch gekennzeichnet, dass sich der Querschnitt in Umfangsrichtung stetig linear verändert.Sensor arrangement according to claim 1, characterized that the cross section changes continuously linearly in the circumferential direction. Sensoranordnung nach Anspruch 1, dadurch gekennzeichnet, dass sich der Querschnitt in Umfangsrichtung stetig nicht linear verändert. Sensor arrangement according to claim 1, characterized that the cross section in the circumferential direction is continuously non-linear changed. Sensoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der magnetosensitive Sensor (3) an der parallel zu der Rotationsachse des Magneten (1) weisenden Stirnfläche des Magneten (1) angeordnet ist.Sensor arrangement according to one of the preceding claims, characterized in that the magneto-sensitive sensor ( 3 ) at the parallel to the axis of rotation of the magnet ( 1 ) facing end face of the magnet ( 1 ) is arranged. Sensoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der magnetosensitive Sensor (3) an der senkrecht zu der Rotationsachse des Magneten (1) weisenden Stirnfläche des Magneten (1) angeordnet ist.Sensor arrangement according to one of the preceding claims, characterized in that the magneto-sensitive sensor ( 3 ) at the perpendicular to the axis of rotation of the magnet ( 1 ) facing end face of the magnet ( 1 ) is arranged. Sensoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Magnetfeldgeber (2) aus einem Spritzgegossenen Kunststoff besteht.Sensor arrangement according to one of the preceding claims, characterized in that the magnetic field transmitter ( 2 ) consists of a injection-molded plastic. Sensoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Magnetfeldgeber (2) ein separates Bauteil bildet oder Bestandteil des Messobjektes ist.Sensor arrangement according to one of the preceding claims, characterized in that the magnetic field transmitter ( 2 ) forms a separate component or is part of the measurement object.
DE102007020158A 2006-04-27 2007-04-26 Rotation angle-sensor arrangement for detecting rotatary movements of measuring object, has magnet with cross section that constantly changes in circumferential direction, and magneto-sensitive sensor arranged at front surface of magnet Withdrawn DE102007020158A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102007020158A DE102007020158A1 (en) 2006-04-27 2007-04-26 Rotation angle-sensor arrangement for detecting rotatary movements of measuring object, has magnet with cross section that constantly changes in circumferential direction, and magneto-sensitive sensor arranged at front surface of magnet

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006020254 2006-04-27
DE102006020254.6 2006-04-27
DE102007020158A DE102007020158A1 (en) 2006-04-27 2007-04-26 Rotation angle-sensor arrangement for detecting rotatary movements of measuring object, has magnet with cross section that constantly changes in circumferential direction, and magneto-sensitive sensor arranged at front surface of magnet

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DE102007020158A1 true DE102007020158A1 (en) 2007-12-13

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DE102007020158A Withdrawn DE102007020158A1 (en) 2006-04-27 2007-04-26 Rotation angle-sensor arrangement for detecting rotatary movements of measuring object, has magnet with cross section that constantly changes in circumferential direction, and magneto-sensitive sensor arranged at front surface of magnet

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010083007A3 (en) * 2009-01-19 2011-04-07 Allegro Microsystems, Inc. Direction detection sensor
CN109256905A (en) * 2017-07-13 2019-01-22 罗斯蒙特航天公司 Toroidal magnet for rotor position estimate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010083007A3 (en) * 2009-01-19 2011-04-07 Allegro Microsystems, Inc. Direction detection sensor
US8022692B2 (en) 2009-01-19 2011-09-20 Allegro Microsystems, Inc. Direction detection sensor
CN109256905A (en) * 2017-07-13 2019-01-22 罗斯蒙特航天公司 Toroidal magnet for rotor position estimate
EP3431932A1 (en) * 2017-07-13 2019-01-23 Rosemount Aerospace Inc. Annular magnets for rotor position estimation
US10389195B2 (en) 2017-07-13 2019-08-20 Rosemount Aerospace Inc. Annular magnets for rotor position estimation
CN109256905B (en) * 2017-07-13 2022-04-05 罗斯蒙特航天公司 Ring magnet for rotor position estimation

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