DE102008012922B4 - Inductive angle sensor - Google Patents
Inductive angle sensor Download PDFInfo
- Publication number
- DE102008012922B4 DE102008012922B4 DE102008012922.4A DE102008012922A DE102008012922B4 DE 102008012922 B4 DE102008012922 B4 DE 102008012922B4 DE 102008012922 A DE102008012922 A DE 102008012922A DE 102008012922 B4 DE102008012922 B4 DE 102008012922B4
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- winding
- angle sensor
- rotor
- inductive angle
- wings
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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
- G01D5/20—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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Induktiver Winkelsensormit einem Stator in planer Anordnung, der mindestens ein Erregerelement (2) und mindestens ein Empfangselement umfasst,mit einem Rotor (3) undmit einer Steuer- und Auswerteeinheit (4),dadurch gekennzeichnet, dass das Erregerelement (2) als Spule mit einer äußeren ersten Wicklung (5) und einer darin beabstandet angeordneten, gegenläufigen zweiten Wicklung (6) ausgebildet ist,wobei die erste Wicklung (5) mindestens eine Windung aufweist,und dass der Rotor (3) einen kreisförmigen Leiter (7) und an dessen Außenumfang schlaufenförmig angeschlossene, gleichmäßig beabstandete Flügel (8) in Form von Kreisringsegmenten umfasst.Inductive angle sensor with a stator in a planar arrangement comprising at least one excitation element (2) and at least one receiving element, with a rotor (3) and with a control and evaluation unit (4), characterized in that the excitation element (2) as a coil with a outer first winding (5) and a spaced-apart, opposing second winding (6) is formed, wherein the first winding (5) has at least one turn, and that the rotor (3) has a circular conductor (7) and at its outer periphery loop-shaped connected, evenly spaced wings (8) in the form of circular ring segments comprises.
Description
Die Erfindung betrifft einen induktiven Winkelsensor gemäß dem Oberbegriff des Anspruchs 1The invention relates to an inductive angle sensor according to the preamble of
Solche Sensoren werden z.B. in Kraftfahrzeugen eingesetzt, um die Position von Stellgliedern zu bestimmen. Sie sind planar aufgebaut, wobei ein Stator eine Leiterkarte mit Erreger- und Empfängerspulen aufgebaut ist. Ein Rotor ist ober- und/oder unterhalb des Stators angeordnet. Eine Auswerteschaltung erlaubt die Ausgabe entsprechender Signale für die Winkelstellung.Such sensors are e.g. used in motor vehicles to determine the position of actuators. They are planar, with a stator, a printed circuit board with exciter and receiver coils is constructed. A rotor is arranged above and / or below the stator. An evaluation circuit allows the output of corresponding signals for the angular position.
Aus der
Die
Die
Gattungsgemäße induktive Winkelsensoren mit den Merkmalen des Oberbegriffs sind jeweils aus den Dokumenten
Bei den bekannten induktiven Winkelsensoren besteht der Nachteil, dass außerhalb des Sensors relativ große, schmalbandige Störfeldstärken bei der Arbeitsfrequenz bestehen. Wegen des möglichen Einflusses auf andere elektronische Bauteile sind diese Störfelder unerwünscht. Eine Verminderung der Störfelder ist z.B. durch Abschirmung möglich; dies ist aber relativ aufwändig.In the known inductive angle sensors has the disadvantage that outside the sensor relatively large, narrow band interference field strengths exist at the working frequency. Because of the possible influence on other electronic components, these interference fields are undesirable. A reduction of the interference fields is e.g. possible by shielding; but this is relatively expensive.
Aufgabe der Erfindung ist es, Störfelder von Winkelsensoren mit geringem Aufwand auf unkritische Größen zu reduzieren.The object of the invention is to reduce interference fields of angle sensors with little effort to uncritical sizes.
Die Aufgabe ist durch die Merkmale des Anspruchs 1 gelöst. Das Erregerelement ist als Spule mit einer äußeren ersten Wicklung und einer darin beabstandet angeordneten, gegenläufigen zweiten Wicklung ausgebildet. Der Rotor umfasst eine kreisförmige Leiterbahn und an deren Außenumfang gleichmäßig beabstandete Leiterbahnen in Form von Kreisringsegmenten. Hierdurch werden zwei Effekte erzielt: Zum einen addieren sich im Bereich des Umfangs des Sensors die Nutzfelder zu einer Gesamterregung; daher können die Ströme insgesamt genutzt werden. Zum anderen subtrahieren sich außerhalb des Umfangs der Spule die unerwünschten elektromagnetischen Störfelder, so dass diese minimiert werden. Die Reduzierung beträgt in etwa 40 dB, was circa einem Hunderstel gegenüber dem Stand der Technik entspricht.The object is solved by the features of
Die Unteransprüche betreffen die vorteilhafte Ausgestaltung der Erfindung.The subclaims relate to the advantageous embodiment of the invention.
Spiralförmige Wicklungen sind besonders geeignet.Spiral windings are particularly suitable.
Wenn im Betrieb erzeugte Feldstärken der ersten und der zweiten Wicklung in etwa gleich groß sind, wird ein Optimum zwischen den Nutzfeldern und der Reduzierung der Störfelder erzielt. Entsprechendes gilt für den Rotor.When field strengths of the first and second windings generated in operation are approximately equal, an optimum between the payload fields and the reduction of interference fields is achieved. The same applies to the rotor.
Wenn eine von dem Leiter eingeschlossene Fläche gleich der Summe der Flächen der Flügel ist, wird das Optimum zwischen den Nutzfeldem und der Reduzierung der Störfelder erzielt.When an area enclosed by the conductor equals the sum of the areas of the wings, the optimum between the payload fields and the reduction of interference fields is achieved.
Anhand der beigefügten schematischen Zeichnungen wird die Erfindung nachfolgend näher erläutert. Dabei zeigt:
-
1 eine perspektivische Ansicht eines induktiven Winkelsensors, -
2 ein Erregerelement als Detail (perspektivisch), -
3 einen Rotor als Detail (perspektivisch) und -
4 die elektromagnetische Feldstärke in Abhängigkeit vom Abstand.
-
1 a perspective view of an inductive angle sensor, -
2 an excitation element as a detail (in perspective), -
3 a rotor as a detail (in perspective) and -
4 the electromagnetic field strength as a function of the distance.
Wie aus der
Das Erregerelement
Je nach den Anforderungen an die Feldstärken können mehrere parallele Wicklungen
Wie aus der
Die Dimensionierung des Rotors geschieht in der Weise, dass die von dem Leiter (
Die Leiterplatte
Der Betrieb erfolgt wie aus dem Stand der Technik bekannt: Die Steuereinrichtung erzeugt einen Wechselstrom mit einer Frequenz von circa vier Megahertz, der durch das Erregerelement
Dies ist in der
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102008012922.4A DE102008012922B4 (en) | 2008-03-06 | 2008-03-06 | Inductive angle sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102008012922.4A DE102008012922B4 (en) | 2008-03-06 | 2008-03-06 | Inductive angle sensor |
Publications (2)
Publication Number | Publication Date |
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DE102008012922A1 DE102008012922A1 (en) | 2009-09-10 |
DE102008012922B4 true DE102008012922B4 (en) | 2019-05-29 |
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DE102008012922.4A Active DE102008012922B4 (en) | 2008-03-06 | 2008-03-06 | Inductive angle sensor |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013204871A1 (en) | 2013-03-20 | 2014-10-09 | Schaeffler Technologies Gmbh & Co. Kg | Method and angle sensor for contactless measurement of an angle |
CN104217836A (en) * | 2014-09-04 | 2014-12-17 | 天津大学 | Coil structure of angle transducer based on electromagnetic induction |
DE102015216479A1 (en) | 2015-08-28 | 2017-03-02 | Robert Bosch Gmbh | Method and apparatus for determining a sensor coil inductance |
DE102016203234B4 (en) * | 2016-02-29 | 2021-02-11 | Robert Bosch Gmbh | Rotation angle sensor |
DE102016211981A1 (en) * | 2016-06-30 | 2018-01-04 | Robert Bosch Gmbh | Coil arrangement and associated measuring arrangement |
US11698275B2 (en) * | 2018-05-29 | 2023-07-11 | Kyocera Avx Components (Werne) Gmbh | Rotary position sensing apparatus and method |
US12013264B2 (en) | 2018-10-16 | 2024-06-18 | Kyocera Avx Components (Werne) Gmbh | Position sensing apparatus and method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19738836A1 (en) | 1997-09-05 | 1999-03-11 | Hella Kg Hueck & Co | Inductive angle sensor |
EP1020018A1 (en) * | 1997-10-02 | 2000-07-19 | Synaptics (UK) Limited | Motor control system |
EP1078226A1 (en) | 1998-05-22 | 2001-02-28 | Synaptics (UK) Limited | Position sensor |
DE10121870A1 (en) | 2001-05-05 | 2002-11-14 | Hella Kg Hueck & Co | Planar inductive angle sensor for measurement of the angular position of rotating components has a double rotor with section placed above and below the stator card to increase measurement sensitivity |
DE10156238A1 (en) | 2001-11-15 | 2003-06-05 | Hella Kg Hueck & Co Patente Ma | Inductive angle sensor, especially for a motor vehicle |
DE102004027954A1 (en) | 2004-06-08 | 2005-12-29 | Hella Kgaa Hueck & Co. | Inductive angle measurement sensor, e.g. for measuring the torsion angle of a steering column, has inductively coupled rotors mounted at a distance from each other on a torsion bar |
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2008
- 2008-03-06 DE DE102008012922.4A patent/DE102008012922B4/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19738836A1 (en) | 1997-09-05 | 1999-03-11 | Hella Kg Hueck & Co | Inductive angle sensor |
EP1020018A1 (en) * | 1997-10-02 | 2000-07-19 | Synaptics (UK) Limited | Motor control system |
EP1078226A1 (en) | 1998-05-22 | 2001-02-28 | Synaptics (UK) Limited | Position sensor |
DE10121870A1 (en) | 2001-05-05 | 2002-11-14 | Hella Kg Hueck & Co | Planar inductive angle sensor for measurement of the angular position of rotating components has a double rotor with section placed above and below the stator card to increase measurement sensitivity |
DE10156238A1 (en) | 2001-11-15 | 2003-06-05 | Hella Kg Hueck & Co Patente Ma | Inductive angle sensor, especially for a motor vehicle |
DE102004027954A1 (en) | 2004-06-08 | 2005-12-29 | Hella Kgaa Hueck & Co. | Inductive angle measurement sensor, e.g. for measuring the torsion angle of a steering column, has inductively coupled rotors mounted at a distance from each other on a torsion bar |
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DE102008012922A1 (en) | 2009-09-10 |
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