WO2009127237A1 - Sensoranordnung zur erfassung des drehwinkels einer um eine rotationsachse rotierenden anordnung - Google Patents
Sensoranordnung zur erfassung des drehwinkels einer um eine rotationsachse rotierenden anordnung Download PDFInfo
- Publication number
- WO2009127237A1 WO2009127237A1 PCT/EP2008/003142 EP2008003142W WO2009127237A1 WO 2009127237 A1 WO2009127237 A1 WO 2009127237A1 EP 2008003142 W EP2008003142 W EP 2008003142W WO 2009127237 A1 WO2009127237 A1 WO 2009127237A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotation
- sensor
- arrangement according
- axis
- permanent magnet
- Prior art date
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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
Definitions
- the invention relates to a sensor arrangement for detecting the angle of rotation of a rotating about a rotation axis arrangement, for example, the axis of rotation of a valve member of a process valve, as described in WO 00/50796.
- two Hall sensors are provided for detecting the angle of rotation or the angular position, among other solutions, which are offset by an angle to each other and are used to detect the magnetic field of a arranged on a rotating shaft permanent magnet.
- the detected magnetic field components depend on many geometric conditions and parameters, so that an evaluation of the sensor signals to an angle signal, in particular to a linear angle signal is very complicated and expensive. Even then, the accuracy of the measurement result leaves something to be desired.
- the present invention has for its object to provide a sensor arrangement for detecting the rotation angle of a rotating about an axis rotation arrangement using at least a 2-dimensional Hall sensor, wherein the two field components to achieve a linear angle signal in a simple manner and without complex electronic measures together can be linked.
- the sensor arrangement according to the invention has the particular advantage that the magnetic field geometry, in particular in the case of permanent magnets which deviate from the circular structure, is compensated by the arrangement of the at least one Hall sensor at an angle of substantially 45 ° to the radial direction. This improves the linearity of the measurement result and the amplitudes of the radial and axial field adapt to each other. Without further adaptation of the two acquired sensor curves for the two field directions (sinusoidal curve and cosine curve), all angles of the rotating arrangement can be exactly detected by combining these two curves into a linear function.
- the permanent magnet arrangement is expediently arranged in the region of the axis of rotation or at this points as a whole a radial or diametrical magnetization and preferably has the shape of one or more rods, circular or oval cylinder, rings, partial rings, cones or double cone.
- the permanent magnet arrangement can be mounted directly on the axis of rotation or shaft in the axis of rotation or be arranged on or on a support which is rotatably formed with the axis of rotation or shaft by frictional engagement, positive engagement or a clamping connection.
- the permanent magnet arrangement may be designed as a ring magnet arranged around the axis of rotation.
- this permanent magnet arrangement may also have at least one pair of bar magnets arranged opposite one another on both sides of the rotation axis.
- the permanent magnet assembly In an expedient structural embodiment carries a connected to the rotating assembly or connectable shaft, the permanent magnet assembly.
- This shaft expediently extends through a sensor housing containing the at least one Hall sensor or protrudes into this housing.
- the sensor arrangement can be placed as a compact, self-contained unit on a rotating arrangement to be detected angularly, for example coupled or plugged.
- the sensor arrangement according to the invention is particularly suitable, for example, for the angle detection of the valve member of a process valve.
- the at least one Hall sensor is expediently arranged on a circuit board in this housing.
- This can expediently a through opening for the shaft and a electrical connection arrangement for connecting the sensor arrangement, for example, to an external control device or control device of the rotating arrangement serve.
- the housing expediently has a removable cover, which is advantageously transparent or one
- This display element is expediently arranged at the free end region of the shaft.
- the magnetic field of the permanent magnet arrangement can be influenced by the geometry of the environment, in particular in an environment containing ferromagnetic components, optimal adjustment angles for the Hall sensor may result in the individual case, which deviates slightly from the ideal angle of 45 °.
- means are advantageously provided for the angular adjustment of the at least one Hall element to an angle at which the linearity is best.
- the Hall sensor signals (sine signal and cosine signal) which detect the two magnetic field components which are perpendicular to one another are expediently linked by an arctan function in order to achieve a linear angular function.
- Fig. 1 as a first embodiment of the invention, the perspective view of a sensor arrangement in a housing with lid removed, in which a ring magnet interacts with a Hall sensor,
- FIG. 3 shows a schematic arrangement for explaining the association between the permanent magnet formed as a ring magnet and the Hall sensor
- Fig. 4 shows a second embodiment of the invention in a perspective arrangement similar to the first embodiment shown in Fig. 1, wherein now two oppositely arranged on a shaft bar magnet with a Hall element and interact
- Fig. 5 is a block diagram for explaining an evaluation circuit.
- a sensor housing 12 consisting of a base part 10 and a cover 11 contains a printed circuit board or board 13, through which a shaft 14 extends.
- This shaft 14 protrudes on the underside of the base part 10 and can be coupled to a rotating arrangement, not shown, whose rotation angle or its angular position to be measured.
- a rotating arrangement may be, for example, the shaft connected to a valve member of a process valve.
- the coupling between the rotating assembly and the shaft 14 can be done in a conventional manner by Georgiastekken, screwing, jamming and the like.
- a radially magnetized, designed as a ring magnet permanent magnet 15 is rotatably fixed in the height of the board 13, which surrounds the shaft 14.
- a 2-dimensional Hall sensor 16 can detect two mutually perpendicular field components Hx and Hy. Furthermore, an electrical connection arrangement 17 is fixed on the circuit board 13, via which the electrical connections of the 2-dimensional Hall sensor 16, which are connected via printed conductors, not shown, on the circuit board 13 to the electrical connection arrangement 17, are connected to an electrical cable can be clamped to the electrical connection assembly 17. The signals can be fed to an external control device, for example to the control device for a process valve.
- the shaft 14 has at its free upper end portion of a display element 18 which is formed by indentations in the shaft 14, and the angular position of the shaft 14 optically
- a display element can be attached to the free end of the shaft 14 or attached in any other way.
- the lid 11 of the sensor housing 12 is either transparent or has a window through which the display element 18 can be observed.
- the two mutually perpendicular field components Hx and Hy are detected as sinusoidal signal and cosine signal.
- the o Hall sensor 16 is positioned at an angle of 45 ° to the radial direction of the shaft 14, as clearly shown for example in FIG. That is, the two acquisition Directions for the two field components Hx and Hy occupy an angle of 45 ° to the radial direction. In this position, the two amplitudes are the same size.
- the Hall sensor 16 may also be arranged adjustable on the circuit board 13, for example, by being arranged on an adjustable rotary member.
- the second embodiment shown in FIG. 4 largely corresponds to the first embodiment, so that the same or equivalent components and assemblies are provided with the same reference numerals and are not described again.
- the annular permanent magnet 15 is replaced by a rod-shaped permanent magnet 21 consisting of two partial areas 19, 20.
- the two partial regions 19, 20 are arranged on opposite sides of the shaft 14 at this.
- the magnetic field distribution is similar to the first embodiment.
- Other arrangements for permanent magnets are also possible which generate a corresponding magnetic field.
- a plurality of Hall sensors 16 may be arranged in a corresponding manner around the shaft 14 around in individual cases and it is also possible to arrange a plurality of permanent magnet arrangements 21, for example according to the second embodiment, around the shaft 14 around.
- FIG. 5 shows a basic block diagram of an evaluation device.
- such an evaluation circuit can be integrated at the Hall sensor 16, which can also be designed, for example, as a programmable microcontroller s.
- the two signals of the Hall sensor 16 offset by 90 °, ie the sine signal and the cosine signal are combined by an arctan function in a corresponding evaluation block 22 in order to achieve a linear angle signal.
- This can be further amplified in a downstream amplifier arrangement 23 so that it can be transmitted less susceptible to interference from the sensor arrangement to a control device.
- the permanent magnet assembly may also have the shape of one or more rods, circular or oval cylinder, rings, partial rings, cones or double cone in each case a total of radial or diametral 20 diametrically. It can also be arranged on or on a support which is non-rotatably connected to the axis of rotation or shaft by frictional engagement, positive engagement or a clamping connection.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/003142 WO2009127237A1 (de) | 2008-04-18 | 2008-04-18 | Sensoranordnung zur erfassung des drehwinkels einer um eine rotationsachse rotierenden anordnung |
DE112008003812T DE112008003812A5 (de) | 2008-04-18 | 2008-04-18 | Sensoranordnung zur Erfassung des Drehwinkels einer um eine Rotationsachse rotierenden Anordnung |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/003142 WO2009127237A1 (de) | 2008-04-18 | 2008-04-18 | Sensoranordnung zur erfassung des drehwinkels einer um eine rotationsachse rotierenden anordnung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009127237A1 true WO2009127237A1 (de) | 2009-10-22 |
Family
ID=40300201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/003142 WO2009127237A1 (de) | 2008-04-18 | 2008-04-18 | Sensoranordnung zur erfassung des drehwinkels einer um eine rotationsachse rotierenden anordnung |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112008003812A5 (de) |
WO (1) | WO2009127237A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113167599A (zh) * | 2018-11-30 | 2021-07-23 | 采埃孚股份公司 | 利用平行于印刷电路板的3-d传感器和旋转轴线捕获旋转角度 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000050796A1 (en) * | 1999-02-23 | 2000-08-31 | Spx Corporation | Position detection for rotary control valves |
EP1821072A2 (de) * | 2006-02-18 | 2007-08-22 | Festo Ag & Co. | Vorrichtung zur Erfassung der Axialposition und/oder Winkelposition eines Körpers |
-
2008
- 2008-04-18 DE DE112008003812T patent/DE112008003812A5/de not_active Withdrawn
- 2008-04-18 WO PCT/EP2008/003142 patent/WO2009127237A1/de active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000050796A1 (en) * | 1999-02-23 | 2000-08-31 | Spx Corporation | Position detection for rotary control valves |
EP1821072A2 (de) * | 2006-02-18 | 2007-08-22 | Festo Ag & Co. | Vorrichtung zur Erfassung der Axialposition und/oder Winkelposition eines Körpers |
Non-Patent Citations (1)
Title |
---|
DIBBERN U: "MAGNETIC FIELD SENSORS USING THE MAGNETORESISTIVE EFFECT", SENSORS AND ACTUATORS, ELSEVIER, vol. 10, 1 January 1986 (1986-01-01), pages 127 - 140, XP007900937, ISSN: 0250-6874 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113167599A (zh) * | 2018-11-30 | 2021-07-23 | 采埃孚股份公司 | 利用平行于印刷电路板的3-d传感器和旋转轴线捕获旋转角度 |
Also Published As
Publication number | Publication date |
---|---|
DE112008003812A5 (de) | 2011-02-10 |
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