DE102007018238A1 - Device for detecting the rotational speed of a rotatable part - Google Patents
Device for detecting the rotational speed of a rotatable part Download PDFInfo
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- DE102007018238A1 DE102007018238A1 DE200710018238 DE102007018238A DE102007018238A1 DE 102007018238 A1 DE102007018238 A1 DE 102007018238A1 DE 200710018238 DE200710018238 DE 200710018238 DE 102007018238 A DE102007018238 A DE 102007018238A DE 102007018238 A1 DE102007018238 A1 DE 102007018238A1
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- sensor
- pole wheel
- sensor elements
- magnetic field
- pole
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
Die Erfindung bezieht sich auf eine Vorrichtung zur Erfassung der Drehzahl eines rotierbaren Teils, die ein mit dem rotierbaren Teil koppelbares drehbewegliches magnetisches Polrad mit über den Umfang alternierend angeordneten magnetischen Nordpolen und Südpolen und Sensormittel umfasst, die ein magnetfeldempfindliches Sensorelement aufweisen, das das von dem Polrad erzeugte Magnetfeld erfasst. Es wird vorgeschlagen, dass die Sensormittel zwei in einem Abstand angeordnete magnetfeldempfindliche Sensorelemente und einen ferromagnetischen Flussleiter aufweisen.The invention relates to a device for detecting the rotational speed of a rotatable member comprising a rotatable magnetic coupling wheel rotatable with the rotatable member with circumferentially arranged alternately arranged magnetic north poles and south poles and sensor means having a magnetic field sensitive sensor element, that of the pole wheel detected magnetic field detected. It is proposed that the sensor means comprise two spaced magnetic field sensitive sensor elements and a ferromagnetic flux guide.
Description
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zur Erfassung der Drehzahl eines rotierbaren Teils nach der Gattung des unabhängigen Anspruchs 1.The The invention is based on a device for detecting the rotational speed a rotatable part after the genus of the independent Claim 1.
Vorrichtungen zur Erfassung der Drehzahl von rotierbaren Teilen kommen in der Kraftfahrzeugindustrie in vielfältiger Form beispielsweise als Raddrehzahlsensoren, Nockenwellensensoren oder Kurbelwellensensoren zum Einsatz. Die dabei verwandten Messprinzipien sind vielfältig, wobei sich berührungslos arbeitende Systeme als robust gegenüber hohen Temperaturen und Verschmutzungen und damit als besonders vorteilhaft erwiesen haben. In der Kraftfahrzeugtechnik werden hierzu auch Vorrichtungen eingesetzt, die magnetfeldempfindliche Sensorelemente wie beispielsweise Hallsensorelemente, Feldplattensensoren oder magnetoresistive Sensoren wie AMR- oder GMR-Sensoren verwenden. Das magnetfeldempfindliche Sensorelement wird in der Nähe eines Rotors angeordnet, der mit der Drehzahl desjenigen Teiles rotiert, dessen Drehzahl erfasst werden soll. Neben den überwiegend eingesetzten magnetisch passiven Rotoren, beispielsweise Zahnrädern, werden auch magnetisch aktive Polräder mit alternierend angeordneten Nordpolen und Südpolen als Rotoren verwandt, da aufgrund des eigenen Magnetismus der Polräder das Sensorelement in einem größeren Abstand zum Rotor angeordnet werden kann, was vielfältigere Anwendungen erlaubt. Die Sensoren erfassen die Änderung der magnetischen Flussdichte oder Feldrichtung und ermitteln hieraus eine Drehzahl.devices for detecting the rotational speed of rotatable parts come in the Automotive industry in many forms, for example as wheel speed sensors, camshaft sensors or crankshaft sensors for use. The related measurement principles are manifold, where non-contact systems are robust against high temperatures and soiling and thus have proved to be particularly advantageous. In automotive engineering For this purpose, devices are used which are sensitive to magnetic fields Sensor elements such as Hall sensor elements, field plate sensors or magnetoresistive sensors such as AMR or GMR sensors. The magnetic field-sensitive sensor element is in the vicinity a rotor arranged at the speed of that part rotates whose speed is to be detected. In addition to the predominantly used magnetically passive rotors, for example gears, are also magnetically active Polräder with alternating North Poles and South Poles are used as rotors, because of the magnetism's own magnetism of the sensor element arranged at a greater distance from the rotor can be, which allows more diverse applications. The sensors capture the change in magnetic flux density or Field direction and determine a speed from this.
Eine
Vorrichtung zur Erfassung der Drehzahl eines rotierbaren Teils mit
den Merkmalen des Oberbegriffs des Anspruchs 1 ist beispielsweise
bekannt aus der Fachzeitschrift
Aus der oben zitierten Veröffentlichung sind auch Differentialhallsensoren bekannt, die zwei in einem Abstand zueinander angeordnete Hallsensorelemente aufweisen, die in Kombination mit einem magnetisch passiven Rotor, insbesondere einem Zahnrad als Drehzahlgeber verwandt werden. Der Abstand der Hallsensoren entspricht dabei dem halben Zahnabstand des Zahnrades. Die hier als Sensormittel eingesetzten Differentialhallsensoren, weisen einen Dauermagneten auf, der mit einem dünnen ferromagnetischen Plättchen homogenisiert wird, das einen Pol des Dauermagneten vollständig abdeckt und auf dessen Oberfläche zwei magnetfeldempfindliche Sensoren angeordnet sind.Out The publications cited above also include differential Hall sensors known, the two spaced apart Hall sensor elements which, in combination with a magnetically passive rotor, in particular a gear as a speed sensor are used. Of the Distance of the Hall sensors corresponds to half the tooth spacing of the gear. The differential Hall sensors used here as sensor means, have a permanent magnet with a thin ferromagnetic Platelet is homogenized, which is one pole of the permanent magnet completely covering and on its surface two magnetic field sensitive sensors are arranged.
Offenbarung der ErfindungDisclosure of the invention
Die erfindungsgemäße Vorrichtung mit den kennzeichnenden Merkmalen des unabhängigen Anspruchs 1 kombiniert die Vorteile von Sensormitteln, die zwei magnetfeldempfindlichen Sensorelemente aufweisen, die durch Erfassung des magnetischen Feldstärkenunterschiedes am Ort der beiden Sensorelemente eine zuverlässige Ermittlung der Drehzahl erlauben, mit den Vorteilen eines magnetisch aktiven Polrades, welches eine Magnetfelderfassung in größerem Abstand vom Polrad gestattet. Um das Drehzahlsignal zuverlässig erfassen zu können, ist es erforderlich, dass an am Ort der Sensorelemente eine ausreichend große Feldstärke vorhanden ist. Die Sensormittel werden daher in Bezug auf die Drehachse des Polrades in einem radialen Abstand vom Polrad angeordnet, der mindestens so groß bemessen ist, das eine Berührung des Polrades ausgeschlossen ist, und der höchstens so groß sein darf, dass die Sensorelemente noch eine ausreichend große Feldstärke erfassen. Der maximale Abstand der Sensormittel vom Polrad stellt eine Begrenzung der Gestaltungsfreiheit dar, die dem Entwickler aufgegeben ist.The inventive device with the characterizing Features of independent claim 1 combines the advantages of sensor means comprising two magnetic field-sensitive sensor elements, by detecting the magnetic field strength difference at the location of the two sensor elements a reliable determination allow the speed, with the benefits of a magnetically active pole wheel, which a magnetic field detection at a greater distance allowed by the flywheel. To the speed signal reliable It is necessary to be able to capture on location the sensor elements a sufficiently large field strength is available. The sensor means are therefore in relation to the axis of rotation of the pole wheel is arranged at a radial distance from the pole wheel, the is at least as large, that a touch of the pole wheel is excluded, and the maximum be so large may, that the sensor elements still a sufficiently large Capture field strength. The maximum distance of the sensor means from the pole wheel represents a limitation of the freedom of design, the abandoned to the developer.
Der Erfindung liegt die Erkenntnis zugrunde, dass der Verlauf der Feldlinien eines magnetischen Polrades am Ort der beiden Sensorelemente eines Sensormittels, welches nach dem Differentialmessprinzip arbeitet, ohne weitere Maßnahmen nicht optimal ist. Dies ist darauf zurückzuführen, dass einerseits der Abstand einer magnetischen Nordpolmitte von einer benachbarten Südpolmitte auf dem Umfang des Polrades einen durch die Obergrenze der Polanzahl vorgegebenen Mindestabstand von typischerweise 10 mm nicht unterschreiten sollte und andererseits die beiden magnetfeldempfindlichen Sensorelemente nicht in einem beliebig großen Abstand voneinander angeordnet sei können. Letzteres ist darauf zurückzuführen, dass die Sensorelemente preisgünstig auf einem gemeinsamen Chip hergestellt werden, beziehungsweise am Markt erhältliche Sensormittel verwandt werden, die zwei auf einem gemeinsamen Chip, beispielsweise einem Hall-IC-Chip angeordnete Hallsensoren verwenden. Aufgrund der Beschränkung der Chipgröße auf ein wirtschaftlich herstellbares Maximalmaß ist auch der Abstand der beiden Sensorelemente beschränkt. Typische Abstände der magnetfeldempfindlichen Sensorelemente liegen daher in der Größenordung von 2,5 mm und sind deutlich kleiner als der Abstand einer Nordpolmitte von einer benachbarten Südpolmitte des Polrades.The invention is based on the finding that the course of the field lines of a magnetic pole wheel at the location of the two sensor elements of a sensor means, which operates on the differential measuring principle, is not optimal without further measures. This is due to the fact that one on the other hand, the distance between a magnetic north pole center of an adjacent Südpolmitte on the circumference of the pole wheel should not fall below a predetermined by the upper limit of the number of poles minimum distance of typically 10 mm and on the other hand, the two magnetic field sensitive sensor elements can not be arranged at an arbitrarily large distance from each other. The latter is due to the fact that the sensor elements are inexpensively manufactured on a common chip, or on the market available sensor means are used which use two arranged on a common chip, such as a Hall IC chip Hall sensors. Due to the limitation of the chip size to an economically producible maximum dimension and the distance of the two sensor elements is limited. Typical distances of the magnetic field-sensitive sensor elements are therefore in the order of magnitude of 2.5 mm and are significantly smaller than the distance of a north pole center of an adjacent Südpolmitte the pole wheel.
Aus diesem Grund verlaufen die magnetischen Feldlinien in einer Drehstellung des Polrades, in welcher das erste Sensorelemente einem Nordpol gewandt ist und das zweite Sensorelement einen benachbarten Südpol zugewandt ist, relativ flach. Das heißt, die in radialer Richtung verlaufende, senkrecht zur Sensorfläche der Sensorelemente orientierte und daher für die Auswertung relevante Magnetfeldkomponente ist relativ klein, wohingegen die tangential zum Polrad verlaufende Magnetfeldkomponente, die parallel zur Sensorfläche orientiert ist und für die Auswertung weniger relevant ist, relativ groß ist. Da es aus den genannten Gründen nicht möglich ist, die Pole zu verkleinern oder aber die Sensorelement weiter beabstandet voneinander auf dem Chip anzuordnen, so dass die Sensorelemente den Polmitten eines benachbarten Nordpols und Südpols genau gegenüberliegen und die magnetischen Feldlinien senkrecht zu den Sensorflächen verlaufen, ist das von den Sensormitteln ausgewertete Signal nicht optimal, da der tangentiale Feldanteil am Ort der beiden Sensormittel gerade bei derjenigen Drehstellung am größten ist, die für die Signalauswertung eigentlich den größten Signalhub liefern sollte.Out For this reason, the magnetic field lines run in a rotational position of the pole wheel, in which the first sensor elements turned to a north pole and the second sensor element is an adjacent south pole facing, relatively flat. That is, in the radial Direction extending, perpendicular to the sensor surface of the sensor elements oriented and therefore relevant for the evaluation magnetic field component is relatively small, whereas the tangential to the flywheel Magnetic field component oriented parallel to the sensor surface and is less relevant for the evaluation, relatively is great. As it does not for the reasons mentioned it is possible to reduce the poles or continue the sensor element spaced from each other on the chip, so that the sensor elements exactly opposite the pole centers of a neighboring North Pole and South Pole and the magnetic field lines perpendicular to the sensor surfaces run, the signal evaluated by the sensor means is not optimal, since the tangential field share at the location of the two sensor means especially at that rotational position largest is, which is actually the largest for the signal evaluation Signal should deliver.
Es wurde gefunden, dass durch einen an den Sensormitteln angeordneten ferromagnetischen Flussleiter der Feldlinienverlauf vorteilhaft derart veränderbar ist, dass die senkrecht zur Sensorfläche der beiden Sensorelemente verlaufende Magnetfeldkomponente im Vergleich zu einem Sensorsmittel ohne ferromagnetischen Flussleiter deutlich vergrößert ist. Aus diesem Grund liefert ein Sensormittel, das zwei in einem Abstand angeordnete magnetfeldempfindliche Sensorelemente und einen ferromagnetischen Flussleiter aufweist, ein größeres Signal als ohne den ferromagnetischen Flussleiter. Die verbesserte Signalerfassung hat vielfältige vorteilhafte Auswirkungen auf Freiheitsgrade bei der anwendungsspezifischen Ausgestaltung der Vorrichtung.It was found that by one at the sensor means arranged ferromagnetic flux guides the field line course advantageous is variable such that the perpendicular to the sensor surface the two sensor elements extending magnetic field component in comparison to a sensor means without ferromagnetic flux guide clearly is enlarged. For this reason, a sensor means that provides two spaced magnetic field sensitive sensor elements and has a ferromagnetic flux guide, a larger one Signal as without the ferromagnetic flux guide. The improved Signal acquisition has many beneficial effects on degrees of freedom in the application-specific design the device.
Vorteilhafte Ausbildungen und Weiterentwicklungen der Erfindung werden durch die in den abhängigen Ansprüchen angegebenen Maßnahmen ermöglicht.advantageous Training and developments of the invention are by allows the measures specified in the dependent claims.
Vorzugsweise bilden die Sensormittel ein Differenzsignal, insbesondere ein Differenzspannungssignal, der von den beiden Sensorelementen erzeugten Ausgangssignale, wobei die Sensorelemente vorzugsweise Hallsensorelemente sind. Vorteilhaft wird durch die Differenzsignalbildung vermieden, dass Schwankungen des Abstands der Sensormittel vom Polrad zu einer Signalverfälschung führen.Preferably the sensor means form a difference signal, in particular a differential voltage signal, the output signals generated by the two sensor elements, wherein the sensor elements are preferably Hall sensor elements. Advantageous is avoided by the difference signal formation that fluctuations the distance of the sensor means from the pole wheel to a signal distortion to lead.
Besonders vorteilhaft weisen die Sensorelemente jeweils eine dem Polrad zugewandte Sensorfläche auf, wobei das von dem Polrad erzeugte Magnetfeld wenigstens bei einer ersten Drehstellung des Polrades eine senkrecht zu der jeweiligen Sensorfläche verlaufende und eine parallel zu der Sensorfläche verlaufende Magnetfeldkomponente aufweist und wobei durch den ferromagnetischen Flussleiter die senkrecht zu der jeweiligen Sensorfläche verlaufende Magnetfeldkomponente zumindest in der ersten Drehstellung vergrößert wird. Hierdurch wird erreicht, dass der für die Signalauswertung relevante Signalhub vergrößert wird. In der ersten Drehstellung des Polrades ist das erste Sensorelement vorzugsweise einem magnetischen Nordpol und das zweite Sensorelement einem benachbarten magnetischen Südpol des Polrades zugewandt.Especially Advantageously, the sensor elements each have a pole wheel facing Sensor surface, wherein the magnetic field generated by the flywheel at least at a first rotational position of the pole wheel a vertical to the respective sensor surface extending and a parallel has magnetic field component extending to the sensor surface and wherein through the ferromagnetic flux guide perpendicular to the respective magnetic field extending magnetic field component enlarged at least in the first rotational position becomes. This ensures that the signal for the evaluation relevant signal swing is increased. In the first The rotational position of the pole wheel is preferably the first sensor element a magnetic north pole and the second sensor element an adjacent facing south magnetic pole of the pole wheel.
Die Sensormittel umfassen vorteilhaft einen Sensorkörper, beispielsweise einen Chip mit integriertem Schaltkreis, an dem die beiden Sensorelemente angeordnet sind.The Sensor means advantageously comprise a sensor body, for example a chip with integrated circuit, on which the two sensor elements are arranged.
In einem vorteilhaften Ausführungsbeispiel der Erfindung sind die Sensorelemente räumlich zwischen dem Polrad und dem Flussleiter angeordnet. Hierdurch werden die Feldlinien nahezu senkrecht durch die Sensorelemente geleitet und die Signalerfassung verbessert. Weiterhin kann der Abstand zwischen Polrad und Sensormitteln vergrößert werden, was eine größere Freiheit bei der konstruktiven Ausgestaltung der Vorrichtung zur Erfassung der Drehzahl erlaubt.In an advantageous embodiment of the invention the sensor elements spatially between the pole wheel and the Arranged flux conductor. As a result, the field lines are almost vertical passed the sensor elements and improves the signal detection. Furthermore, the distance between the rotor and sensor means can be increased What greater freedom in the constructive Design of the device for detecting the speed allowed.
In einem anderen Ausführungsbeispiel der Erfindung ist das ferromagnetische Flussleitstück räumlich zwischen dem Polrad und den Sensorelementen angeordnet. Hierdurch wird vorteilhaft erreicht, dass die Richtung der Feldlinien relativ zu den Sensorelementen umgekehrt wird. Dadurch kann bei Sensorelementen mit Drehrichtungsausgabe eine Umstellung der Signalauswertung von Linkslauf auf Rechtslauf oder umgekehrt durch Anordnung des ferromagnetischen Flussleitstückes angepasst werden. Eine Drehung der Sensormittel in Bezug auf das Polrad ist hierzu nicht erforderlich.In another embodiment of the invention, the ferromagnetic flux guide is arranged spatially between the pole wheel and the sensor elements. In this way, it is advantageously achieved that the direction of the field lines is reversed relative to the sensor elements. As a result, sensor elements with direction output can have a Conversion of the signal evaluation from left to right rotation or vice versa by arranging the ferromagnetic flux guide to be adjusted. A rotation of the sensor means with respect to the pole wheel is not required for this purpose.
Als besonders geeignet haben sich plattenförmige Flussleiter erwiesen, die in einer zu einer gemeinsamen Ebene der Sensorelemente parallelen Ebene angeordnet ist.When plate-shaped flux conductors are particularly suitable proved in one to a common plane of the sensor elements arranged parallel plane.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigenembodiments The invention are illustrated in the drawings and in the following description. Show it
Ausführungsformen der Erfindungembodiments the invention
Es
wird angenommen, dass das Polrad mit einer Drehzahl φ rotiert.
In
In
Bei
einer Vergrößerung des Abstandsmaßes a
der beiden Sensorelemente
Erfindungsgemäß wird
das Sensormittel
Das
Ergebnis ist in
Ein
zweites Ausführungsbeispiel der Erfindung ist in
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte Nicht-PatentliteraturCited non-patent literature
- - „Bosch–Gelbe Reihe, Technische Unterrichtung, Elektrik und Elektronik für Kraftfahrzeuge, Sensoren im Kraftfahrzeug", 1. Ausgabe, Juni 2001, ISBN-3-7782-2031-4, Seite 47 [0003] - "Bosch Yellow Series, Technical Briefing, Electricity and Electronics for Motor Vehicles, Automotive Sensors", 1st Edition, June 2001, ISBN-3-7782-2031-4, page 47 [0003]
Claims (10)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE200710018238 DE102007018238A1 (en) | 2007-04-18 | 2007-04-18 | Device for detecting the rotational speed of a rotatable part |
EP08735644A EP2137498A2 (en) | 2007-04-18 | 2008-04-01 | Device for recording the rotational speed of a rotatable part |
PCT/EP2008/053871 WO2008128857A2 (en) | 2007-04-18 | 2008-04-01 | Device for recording the rotational speed of a rotatable part |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE200710018238 DE102007018238A1 (en) | 2007-04-18 | 2007-04-18 | Device for detecting the rotational speed of a rotatable part |
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DE102007018238A1 true DE102007018238A1 (en) | 2008-10-23 |
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DE200710018238 Withdrawn DE102007018238A1 (en) | 2007-04-18 | 2007-04-18 | Device for detecting the rotational speed of a rotatable part |
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DE (1) | DE102007018238A1 (en) |
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Cited By (45)
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DE102009026531A1 (en) | 2009-05-28 | 2010-12-02 | Robert Bosch Gmbh | Method for detecting a rotation of a rotatable part |
US8143169B2 (en) | 2007-03-29 | 2012-03-27 | Allegro Microsystems, Inc. | Methods for multi-stage molding of integrated circuit package |
DE102011081222A1 (en) | 2011-08-19 | 2013-02-21 | Zf Friedrichshafen Ag | Method for producing sensor assembly e.g. rotational speed sensor assembly mounted in motor vehicle, involves placing magnetic field sensor in receptacle of housing that is arranged adjacent to magnetic flux collector |
US8461677B2 (en) | 2008-12-05 | 2013-06-11 | Allegro Microsystems, Llc | Magnetic field sensors and methods for fabricating the magnetic field sensors |
US8629539B2 (en) | 2012-01-16 | 2014-01-14 | Allegro Microsystems, Llc | Methods and apparatus for magnetic sensor having non-conductive die paddle |
WO2015062592A1 (en) * | 2013-10-29 | 2015-05-07 | Schaeffler Technologies AG & Co. KG | Sensor system for rotational speed measurement having a pole wheel with a linearized magnetic field |
US9411025B2 (en) | 2013-04-26 | 2016-08-09 | Allegro Microsystems, Llc | Integrated circuit package having a split lead frame and a magnet |
US9494660B2 (en) | 2012-03-20 | 2016-11-15 | Allegro Microsystems, Llc | Integrated circuit package having a split lead frame |
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US9720054B2 (en) | 2014-10-31 | 2017-08-01 | Allegro Microsystems, Llc | Magnetic field sensor and electronic circuit that pass amplifier current through a magnetoresistance element |
US9719806B2 (en) | 2014-10-31 | 2017-08-01 | Allegro Microsystems, Llc | Magnetic field sensor for sensing a movement of a ferromagnetic target object |
US9810519B2 (en) | 2013-07-19 | 2017-11-07 | Allegro Microsystems, Llc | Arrangements for magnetic field sensors that act as tooth detectors |
US9812588B2 (en) | 2012-03-20 | 2017-11-07 | Allegro Microsystems, Llc | Magnetic field sensor integrated circuit with integral ferromagnetic material |
US9817078B2 (en) | 2012-05-10 | 2017-11-14 | Allegro Microsystems Llc | Methods and apparatus for magnetic sensor having integrated coil |
US9823092B2 (en) | 2014-10-31 | 2017-11-21 | Allegro Microsystems, Llc | Magnetic field sensor providing a movement detector |
US9823090B2 (en) | 2014-10-31 | 2017-11-21 | Allegro Microsystems, Llc | Magnetic field sensor for sensing a movement of a target object |
DE102016215635A1 (en) | 2016-08-19 | 2018-02-22 | Robert Bosch Gmbh | Apparatus and method for determining a rotational speed of a rotating roller body |
US10012518B2 (en) | 2016-06-08 | 2018-07-03 | Allegro Microsystems, Llc | Magnetic field sensor for sensing a proximity of an object |
US10041810B2 (en) | 2016-06-08 | 2018-08-07 | Allegro Microsystems, Llc | Arrangements for magnetic field sensors that act as movement detectors |
US10145908B2 (en) | 2013-07-19 | 2018-12-04 | Allegro Microsystems, Llc | Method and apparatus for magnetic sensor producing a changing magnetic field |
US10215550B2 (en) | 2012-05-01 | 2019-02-26 | Allegro Microsystems, Llc | Methods and apparatus for magnetic sensors having highly uniform magnetic fields |
US10234513B2 (en) | 2012-03-20 | 2019-03-19 | Allegro Microsystems, Llc | Magnetic field sensor integrated circuit with integral ferromagnetic material |
US10260905B2 (en) | 2016-06-08 | 2019-04-16 | Allegro Microsystems, Llc | Arrangements for magnetic field sensors to cancel offset variations |
US10310028B2 (en) | 2017-05-26 | 2019-06-04 | Allegro Microsystems, Llc | Coil actuated pressure sensor |
US10324141B2 (en) | 2017-05-26 | 2019-06-18 | Allegro Microsystems, Llc | Packages for coil actuated position sensors |
US10495699B2 (en) | 2013-07-19 | 2019-12-03 | Allegro Microsystems, Llc | Methods and apparatus for magnetic sensor having an integrated coil or magnet to detect a non-ferromagnetic target |
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GB2542144A (en) * | 2015-09-08 | 2017-03-15 | Airbus Operations Ltd | Determining rotational speed or direction of a body |
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Also Published As
Publication number | Publication date |
---|---|
WO2008128857A2 (en) | 2008-10-30 |
EP2137498A2 (en) | 2009-12-30 |
WO2008128857A3 (en) | 2009-02-05 |
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