DE102011116910A1 - Device for detecting rotational angle of shaft of servomotor or potentiometer, has rotary element provided with external thread and located in or on screw thread guide, and hall sensor detected at distance between sensor and magnet - Google Patents
Device for detecting rotational angle of shaft of servomotor or potentiometer, has rotary element provided with external thread and located in or on screw thread guide, and hall sensor detected at distance between sensor and magnet Download PDFInfo
- Publication number
- DE102011116910A1 DE102011116910A1 DE102011116910A DE102011116910A DE102011116910A1 DE 102011116910 A1 DE102011116910 A1 DE 102011116910A1 DE 102011116910 A DE102011116910 A DE 102011116910A DE 102011116910 A DE102011116910 A DE 102011116910A DE 102011116910 A1 DE102011116910 A1 DE 102011116910A1
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- Germany
- Prior art keywords
- shaft
- magnet
- rotary element
- hall sensor
- sensor
- 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.)
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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
-
- 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
- G01D2205/20—Detecting rotary movement
- G01D2205/22—Detecting rotary movement by converting the rotary movement into a linear movement
-
- 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
- G01D2205/20—Detecting rotary movement
- G01D2205/26—Details of encoders or position sensors specially adapted to detect rotation beyond a full turn of 360°, e.g. multi-rotation
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Erfassung des Drehwinkels 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 angle of rotation 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 oder Potentiometers, sind bereits bekannt. Der Magnet wird bei diesen Vorrichtungen auf dem Wellenende und koaxial zur Welle befestigt. Anschließend wird das Wellenende mit Magnet 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 or potentiometer, 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 with a magnet in a bearing of a sensor housing in which the Hall sensor and usually also the evaluation are arranged.
Die bisher bekannten Sensorvorrichtungen haben den Nachteil, dass keine Messung von Winkeln > 360° möglich ist. Außerdem liefert bei einem leicht schrägen Einsetzen der Welle mit dem Magneten in die Lagerbuchse des Gehäuses der Hall-Sensor fehlerhafte Signale. Darüber hinaus ist die Auflösung der Sensorvorrichtung insbesondere bei Wellen mit kleinem Durchmesser relativ gering.The previously known sensor devices have the disadvantage that no measurement of angles> 360 ° is possible. In addition, 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 auch von Drehwinkeln > 360° bereitzustellen, die außerdem weniger empfindlich gegenüber Fertigungstoleranzen ist und zudem eine höhere Auflösung aufweist als die bisher bekannten Vorrichtungen.The present invention is therefore an object of the invention to provide a device for detecting angles of rotation> 360 °, which is also 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 des Drehwinkels einer Welle, mit einem Magneten, der bei Drehung der Welle ebenfalls seine Winkelposition verändert, und mit mindestens 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, wobei das Drehelement mit einem Gewinde versehen ist und in oder auf einer Gewindeführung sitzt und wobei der mindestens eine Hall-Sensor auch den Abstand zwischen ihm und dem Magneten erfasst.The object is achieved by a device for detecting the angle of rotation of a shaft, with a magnet which also changes its angular position upon rotation of the shaft, and with at least one Hall sensor for detecting the angular position of the magnet, which is characterized in that the magnet is arranged on a rotary member which also undergoes rotation upon rotation of the shaft, wherein the rotary member is provided with a thread and is seated in or on a thread guide and wherein the at least one Hall sensor also detects the distance between it and the magnet.
Dadurch, dass der Magnet bei der erfindungsgemäßen Vorrichtung nicht mehr auf der Welle sondern auf einem separaten, mit einem Gewinde versehenen Drehelement angeordnet ist, können auch Drehwinkel der Welle > 360° erfasst werden. Der Magnet ändert nicht nur seine Winkelposition sondern auch seine axiale Position, wenn sich die Welle um mehr als 360° dreht. Sowohl die Winkelposition als auch die axiale Position des Magneten können von einem oder mehreren Hall-Sensoren erfasst werden, da sich die Signale der Sensoren auch bei einer Abstandsänderung zwischen ihnen und dem Magneten verändern. Die separate Anordnung von Magnet und Welle hat außerdem den Vorteil, dass ein leicht schräges Einsetzen der Welle dann keinen Einfluss auf die Relativposition von Magnet und Hall-Sensor hat und somit die Messgenauigkeit nicht beeinflusst.Because the magnet in the device according to the invention is no longer arranged on the shaft but on a separate, threaded rotary element, rotational angles of the shaft> 360 ° can also be detected. The magnet changes not only its angular position but also its axial position as the shaft rotates more than 360 °. Both the angular position and the axial position of the magnet can be detected by one or more Hall sensors, since the signals of the sensors change even with a change in distance between them and the magnet. The separate arrangement of magnet and shaft also has the advantage that 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.For transmitting the rotational movement of the shaft to the rotary member with the magnet, there are various conceivable design options.
Bei einer bevorzugten Ausgestaltung ist das Drehelement mit dem Magneten über ein Außengewinde in einem Gehäuse gelagert, wobei durch eine Federvorspannung das Spiel innerhalb des Außengewindes eliminiert wird. In dieses Drehelement ragt das Antriebselement, welches über ein Federspannelement vorgespannt ist. Die Übertragung der Drehung der Welle erfolgt über einen Kraftschluss zwischen Antriebs- und Drehelement.In a preferred embodiment, the rotary member is mounted with the magnet via an external thread in a housing, wherein the play within the external thread is eliminated by a spring bias. In this rotary element protrudes the drive element, which is biased by a spring tensioning element. The transmission of the rotation of the shaft via a frictional connection between the drive and rotary element.
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.
Nachfolgend wird ein bevorzugtes Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung anhand der Zeichnung näher beschrieben.Hereinafter, a preferred embodiment of a device according to the invention will be described in detail with reference to the drawing.
Es zeigen:Show it:
Gemäß
Die Winkelposition der in das Gehäuse
Die Übertragung der Drehbewegung der Welle
Erfährt die Welle eine Drehung um mehr als 360°, so wird das Außengewinde
Wie
Es versteht sich, dass selbstverständlich auch mehrere Hall-Sensoren, insbesondere zwei Hall-Sensoren vorgesehen sein können. Ein Hall-Sensor kann eingesetzt werden, um die Größe des Luftspalts zu messen, der andere um die Winkelposition zu erfassen.It is understood that, of course, a plurality of Hall sensors, in particular two Hall sensors can be provided. A Hall sensor can be used to measure the size of the air gap, the other to detect the angular position.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011116910A DE102011116910A1 (en) | 2011-10-25 | 2011-10-25 | Device for detecting rotational angle of shaft of servomotor or potentiometer, has rotary element provided with external thread and located in or on screw thread guide, and hall sensor detected at distance between sensor and magnet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011116910A DE102011116910A1 (en) | 2011-10-25 | 2011-10-25 | Device for detecting rotational angle of shaft of servomotor or potentiometer, has rotary element provided with external thread and located in or on screw thread guide, and hall sensor detected at distance between sensor and magnet |
Publications (1)
Publication Number | Publication Date |
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DE102011116910A1 true DE102011116910A1 (en) | 2013-04-25 |
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DE102011116910A Withdrawn DE102011116910A1 (en) | 2011-10-25 | 2011-10-25 | Device for detecting rotational angle of shaft of servomotor or potentiometer, has rotary element provided with external thread and located in or on screw thread guide, and hall sensor detected at distance between sensor and magnet |
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DE (1) | DE102011116910A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014213405A1 (en) | 2014-07-10 | 2016-01-14 | Ifm Electronic Gmbh | Proximity switch with a magnetic rotary switch |
EP3088590A1 (en) * | 2015-04-30 | 2016-11-02 | Dürkopp Adler AG | Sewing machine |
DE102016119881A1 (en) * | 2016-10-19 | 2018-04-19 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Sensor device for measuring a linear or rotational movement of a measurement object |
-
2011
- 2011-10-25 DE DE102011116910A patent/DE102011116910A1/en not_active Withdrawn
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014213405A1 (en) | 2014-07-10 | 2016-01-14 | Ifm Electronic Gmbh | Proximity switch with a magnetic rotary switch |
EP3088590A1 (en) * | 2015-04-30 | 2016-11-02 | Dürkopp Adler AG | Sewing machine |
KR20160129732A (en) * | 2015-04-30 | 2016-11-09 | 뒤르콥 아들러 악티엔게젤샤프트 | Sewing machine |
KR102503364B1 (en) | 2015-04-30 | 2023-02-23 | 뒤르콥 아들러 게엠베하 | Sewing machine |
DE102016119881A1 (en) * | 2016-10-19 | 2018-04-19 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Sensor device for measuring a linear or rotational movement of a measurement object |
CN109844461A (en) * | 2016-10-19 | 2019-06-04 | 克诺尔商用车制动系统有限公司 | For to measurement object linear movement or the sensor device that measures of rotary motion |
US10907990B2 (en) | 2016-10-19 | 2021-02-02 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Sensor device for measuring a linear or rotational movement of a measurement object |
CN109844461B (en) * | 2016-10-19 | 2021-06-22 | 克诺尔商用车制动系统有限公司 | Sensor device for measuring linear or rotational movements of a measurement object |
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