DE102011115260A1 - Device for detecting angular position of shaft of servomotor, has Hall-sensor detecting angular position of magnets, where magnets are arranged on rotation element e.g. toothed wheel, which finds rotation during rotation of shaft - Google Patents
Device for detecting angular position of shaft of servomotor, has Hall-sensor detecting angular position of magnets, where magnets are arranged on rotation element e.g. toothed wheel, which finds rotation during rotation of shaft Download PDFInfo
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- DE102011115260A1 DE102011115260A1 DE201110115260 DE102011115260A DE102011115260A1 DE 102011115260 A1 DE102011115260 A1 DE 102011115260A1 DE 201110115260 DE201110115260 DE 201110115260 DE 102011115260 A DE102011115260 A DE 102011115260A DE 102011115260 A1 DE102011115260 A1 DE 102011115260A1
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- shaft
- rotation
- angular position
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- 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
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- 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
Description
Die Erfindung betrifft eine Vorrichtung zur Erfassung der Winkelposition einer Welle mit einem Magneten, der bei Drehung der Welle ebenfalls seine Winkelposition verändert, und mit einem Hall-Sensor zur Erfassung der Winkelposition des Magneten.The invention relates to a device for detecting the angular position of a shaft with a magnet, which also changes its angular position upon rotation of the shaft, and with a Hall sensor for detecting the angular position of the magnet.
Solche Sensorvorrichtungen zur Erfassung der Winkelposition einer Welle, beispielsweise der Welle eines Stellmotors, sind bereits bekannt. Der Magnet wird bei diesen Vorrichtungen auf dem Wellenende und koaxial zur Welle befestigt. Anschließend wird das Wellenende in ein Lager eines Sensorgehäuses eingesetzt, in dem der Hall-Sensor sowie in der Regel auch die Auswerteelektronik angeordnet sind.Such sensor devices for detecting the angular position of a shaft, for example the shaft of a servomotor, are already known. The magnet is fixed in these devices on the shaft end and coaxial with the shaft. Subsequently, the shaft end is inserted into a bearing of a sensor housing, in which the Hall sensor and, as a rule, also the evaluation electronics are arranged.
Die bisher bekannten Sensorvorrichtungen haben den Nachteil, dass bei einem leicht schrägen Einsetzen der Welle mit dem Magneten in die Lagerbuchse des Gehäuses der Hall-Sensor fehlerhafte Signale liefert. Darüber hinaus ist die Auflösung der Sensorvorrichtung insbesondere bei Wellen mit kleinem Durchmesser relativ gering.The previously known sensor devices have the disadvantage that with a slightly oblique insertion of the shaft with the magnet in the bearing bush of the housing of the Hall sensor provides erroneous signals. In addition, the resolution of the sensor device is relatively low, especially in the case of small-diameter shafts.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zur Erfassung der Winkelposition bereitzustellen, die weniger empfindlich gegenüber Fertigungstoleranzen ist und zudem eine höhere Auflösung aufweist als die bisher bekannten Vorrichtungen.The present invention is therefore based on the object to provide a device for detecting the angular position, which is less sensitive to manufacturing tolerances and also has a higher resolution than the previously known devices.
Die Aufgabe wird gelöst durch eine Vorrichtung zur Erfassung der Winkelposition einer Welle, mit einem Magneten, der bei Drehung der Welle ebenfalls seine Winkelposition verändert, und mit einem Hall-Sensor zur Erfassung der Winkelposition des Magneten, die dadurch gekennzeichnet ist, dass der Magnet auf einem Drehelement angeordnet ist, das bei Drehung der Welle ebenfalls eine Drehung erfährt.The object is achieved by a device for detecting the angular position of a shaft, with a magnet which also changes its angular position upon rotation of the shaft, and with a Hall sensor for detecting the angular position of the magnet, which is characterized in that the magnet a rotary member is arranged, which also undergoes rotation upon rotation of the shaft.
Dadurch, dass der Magnet bei der erfindungsgemäßen Vorrichtung nicht mehr auf der Welle sondern auf einem separaten Drehelement angeordnet ist, kann er in einem festen Abstand zum Hall-Sensor und parallel zu diesem in der Vorrichtung angeordnet werden. Ein leicht schräges Einsetzen der Welle hat dann keinen Einfluss auf die Relativposition von Magnet und Hall-Sensor und beeinflusst somit die Messgenauigkeit nicht.Because the magnet in the device according to the invention is no longer arranged on the shaft but on a separate rotary element, it can be arranged at a fixed distance from the Hall sensor and parallel to it in the device. A slightly oblique insertion of the shaft then has no influence on the relative position of the magnet and Hall sensor and thus does not affect the measurement accuracy.
Zur Übertragung der Drehbewegung der Welle auf das Drehelement mit dem Magneten gibt es verschiedene denkbare Ausführungsmöglichkeiten. Bei einer bevorzugten Ausgestaltung ist das Drehelement als Zahnrad ausgebildet und die Welle mit einem Zahnelement drehfest verbindbar, dessen Verzahnung mit dem Zahnrad kämmt. Die Übertragung der Drehung der Welle könnte jedoch auch über einen Riemen oder dergleichen erfolgen. Durch eine entsprechende Dimensionierung des Zahnelements und des Zahnrades kann ein Übersetzungsverhältnis zwischen der Drehung der Welle und der Drehung des Magneten realisiert werden, das eine hohe Auflösung der Vorrichtung ergibt.For transmitting the rotational movement of the shaft to the rotary member with the magnet, there are various conceivable design options. In a preferred embodiment, the rotary member is formed as a gear and the shaft rotatably connected to a toothed element whose teeth mesh with the gear. However, the transmission of the rotation of the shaft could also be via a belt or the like. By a corresponding dimensioning of the toothed element and the gear, a transmission ratio between the rotation of the shaft and the rotation of the magnet can be realized, which results in a high resolution of the device.
Das Zahnelement kann beispielsweise eine Scheibe sein, deren Umfang zumindest teilweise mit einer Verzahnung versehen ist. Das Zahnrad kann dabei aus zwei gegeneinander vorgespannten Scheiben gebildet sein, um ein Spiel ausschließen zu können.The toothed element may for example be a disc whose circumference is at least partially provided with a toothing. The gear can be formed from two mutually prestressed discs to exclude a game can.
Weiter ist es möglich, den Magnet und das Zahnrad einteilig auszubilden, wobei das Zahnrad aus Kunststoff gefertigt ist und der Magnet kunststoffgebunden ist. Dabei kann das Zahnrad direkt an den Magneten angespritzt werden.Further, it is possible to form the magnet and the gear in one piece, wherein the gear is made of plastic and the magnet is plastic-bonded. The gear can be molded directly onto the magnet.
Bei dieser Ausgestaltung ist es außerdem möglich, den Magneten axial zu magnetisieren. Insgesamt erhält dadurch der Magnet mit dem angefügten Zahnrad die gleichen Eigenschaften wie ein diametral magnetischer Ringmagnet.In this embodiment, it is also possible to magnetize the magnet axially. Overall, this gives the magnet with the attached gear the same properties as a diametrically magnetic ring magnet.
Weitere Vorteile ergeben sich, wenn der Hall-Sensor in einem Gehäuse durch einen Luftspalt beabstandet zum Magneten angeordnet ist. Das Gehäuse schirmt die Magnet-Hall-Sensor-Anordnung nach außen ab und vermeidet somit Störeinflüsse auf das Messergebnis.Further advantages arise when the Hall sensor is arranged in a housing spaced by an air gap to the magnet. The housing shields the magnetic Hall sensor arrangement to the outside and thus avoids interference on the measurement result.
Der Hall-Sensor kann dabei vorzugsweise auf einer Platine angeordnet sein, die zumindest im Wesentlichen parallel zum Zahnrad ausgerichtet ist. Auf der Platine kann die Auswerteelektronik der Vorrichtung sitzen, sodass insgesamt eine kompakte Bauweise der Vorrichtung erreicht werden kann.The Hall sensor can preferably be arranged on a circuit board, which is aligned at least substantially parallel to the gear. On the board, the evaluation of the device can sit, so that a total of a compact design of the device can be achieved.
Zur Erhöhung der Präzision kann außerdem das Zahnrad von zwei gegeneinander vorgespannten gezahnten Scheiben gebildet sein.To increase the precision, the gear can also be formed by two counter-toothed discs.
Weitere Vorteile ergeben sich, wenn die Welle zusätzlich in der Platine gelagert ist. Auf diese Weise wird die Welle an zwei Stellen, in der Hauptlagerbuchse und in der Platine gelagert, wodurch eine deutlich bessere Führung der Welle und damit auch eine höhere Messgenauigkeit erzielbar sind.Further advantages arise when the shaft is additionally stored in the board. In this way, the shaft is mounted in two places, in the main bearing bush and in the board, whereby a much better management of the shaft and thus a higher measurement accuracy can be achieved.
Nachfolgend wird elf bevorzugtes Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung anhand der Zeichnung näher beschrieben.In the following, eleven preferred embodiments of a device according to the invention will be described in more detail with reference to the drawing.
Es zeigen:Show it:
Gemäß
Die Winkelposition der in die Lagerbuchse
Dadurch, dass der Magnet
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110115260 DE102011115260A1 (en) | 2011-09-29 | 2011-09-29 | Device for detecting angular position of shaft of servomotor, has Hall-sensor detecting angular position of magnets, where magnets are arranged on rotation element e.g. toothed wheel, which finds rotation during rotation of shaft |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE201110115260 DE102011115260A1 (en) | 2011-09-29 | 2011-09-29 | Device for detecting angular position of shaft of servomotor, has Hall-sensor detecting angular position of magnets, where magnets are arranged on rotation element e.g. toothed wheel, which finds rotation during rotation of shaft |
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DE102011115260A1 true DE102011115260A1 (en) | 2013-04-04 |
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DE201110115260 Ceased DE102011115260A1 (en) | 2011-09-29 | 2011-09-29 | Device for detecting angular position of shaft of servomotor, has Hall-sensor detecting angular position of magnets, where magnets are arranged on rotation element e.g. toothed wheel, which finds rotation during rotation of shaft |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106871852A (en) * | 2017-04-27 | 2017-06-20 | 深圳市矩阵动力科技开发有限公司 | A kind of angular transducer with torque output |
-
2011
- 2011-09-29 DE DE201110115260 patent/DE102011115260A1/en not_active Ceased
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106871852A (en) * | 2017-04-27 | 2017-06-20 | 深圳市矩阵动力科技开发有限公司 | A kind of angular transducer with torque output |
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Representative=s name: KOHLER SCHMID MOEBUS PATENTANWAELTE PARTNERSCH, DE Representative=s name: KOHLER SCHMID MOEBUS, DE |
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Effective date: 20150317 |