EP1379840A1 - Vorrichtung zur erkennung der position, bewegungsrichtung und/oder geschwindigkeit eines körpers mit ferromagnetischen eigenschaften - Google Patents
Vorrichtung zur erkennung der position, bewegungsrichtung und/oder geschwindigkeit eines körpers mit ferromagnetischen eigenschaftenInfo
- Publication number
- EP1379840A1 EP1379840A1 EP02737799A EP02737799A EP1379840A1 EP 1379840 A1 EP1379840 A1 EP 1379840A1 EP 02737799 A EP02737799 A EP 02737799A EP 02737799 A EP02737799 A EP 02737799A EP 1379840 A1 EP1379840 A1 EP 1379840A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic field
- speed
- movement
- ferromagnetic
- actuator
- 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.)
- Withdrawn
Links
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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
Definitions
- the invention relates to a device for detecting the position, direction of movement and / or speed of a body with ferromagnetic properties according to the preamble of patent claim 1 and to use of the device according to patent claims 10 and 12
- marking with a strong magnetic field can be used.
- a sufficiently strong permanent magnet is placed in the hydraulic piston.
- this combination is used when using conventional magnetic sensors (reed contact, Hall sensor etc) only effective to a limited extent because the magnetic field of the magnet in the piston is almost completely shielded or short-circuited by the ferromagnetic cylinder wall.
- DE 1971 1781 C2 has disclosed a device which requires the placement of several permanent magnets as close as possible to the ferromagnetic wall in order to to detect the position of an actuator via stray field influences Another application is in the field of so-called pig technology.
- a batch of cleaning fluid may then occur, again followed by a pig, after which the line is then sufficiently cleaned for other, further chemical transports.
- the transport measure shown above alone requires 3 such pigs Being able to assign them objectively and unambiguously is of particular importance here the observation and tracking of the pigs in the sense of preventive maintenance for possible changes and impairments of the functionality. This can be done by statistical evaluation of the distances traveled by the respective pig in order to calculate wear and tear based on experience is the unambiguous identification of the individual pig in order to register positions, distances traveled etc. in a higher-level host computer. To do this, the wall of a ferromagnetic or stainless steel tube must be hi n can be clearly differentiated from one another by a certain number of newts
- the invention has for its object to ensure a position determination or identification of ferromagnetic bodies in a simple manner with simple means
- a device in which a magnetic field sensor is present, the position, direction of movement and / or speed of the body being recognizable by the change in the magnetic field due to the changes in position of the body
- the position, direction of movement and / or speed of movable ferromagnetic bodies can thus be detected through the wall of ferromagnetic or non-ferromagnetic materials by using appropriately sensitive magnetic sensors to change the overall magnetic field at the measurement location, consisting of an earth field and superimposed static and dynamic ones Background fields, which are partly generated by the ferromagnetic body itself, is detected by the entry of a ferromagnetic body into the measuring field of the sensor.
- the overall field at the measuring location can also contain a static, periodically pulsed or periodic component, which is specifically generated externally and whose change at the location of the sensor due to the presence of the movable ferromagnetic body is detected
- this material can be, for example, stainless steel, aluminum, brass or ceramic or plastic
- the senor does not have to be attached to the wall of the ferromagnetic or non-ferromagnetic housing or a cylinder tube or a pipeline, but can be freely and freely positioned in a separate sensor housing Magnetoresistance sensors (AMR and preferably GMR), as well as the CMR sensors, which were previously only available as prototypes
- the body has a surface structure.
- the position of the body can be detected in the sense of a path measurement.
- the direction of movement and / or the speed of the body can be recognized
- the surface structure results in influences of different magnitudes on the magnetic field depending on the position of the body.
- the position of the body can be inferred from an evaluation of the magnetic field at a certain point. By evaluating the time course of the signal, the direction of movement and / or the speed of the body can be recognized As an alternative to determining the position in the sense of a continuous path measurement, an evaluation can also be carried out in the sense of reaching one or more target positions as threshold values
- the surface structure can be step-shaped according to claim 3 or also have a continuously differentiable course according to claim 4
- a plurality of sensors are present, the sensor signals with regard to the detection of the position of the body in the sense of a path measurement, the detection of the direction of movement of the body and / or the detection of the speed of the sensor due to the spatial distribution of the sensors Body can be evaluated
- the sensor signals can be evaluated over time so that the corresponding sizes can be identified
- the magnetic field sensor or the magnetic field sensors can be produced in screen printing technology with a magnetically sensitive printing paste
- This screen printing technology is basically known from thick film hybrid technology
- a permanent magnet is provided for determining an operating point of the magnetic field sensor
- This can be given a magnetic field of suitable strength, which can be evaluated with regard to its changes due to the change in position of the body
- the magnetic field sensor is connected gradiometrically in the first or second order
- the magnetic field sensors can preferably be connected alternatively or additionally in a bridge circuit
- a stationary, periodically pulse-shaped magnetic field can be generated
- such a magnetic field may be more suitable for performing the position detection according to the invention
- Claim 10 relates to a use of the device for detecting the position, direction of movement and / or speed of an actuator of an actuator, the actuator being made of ferromagnetic material
- the wall of the actuator can consist of ferromagnetic material or of non-magnetic or non-magnetizable material.
- the device can be used to detect the position, direction of movement and / or speed of a pig body for transporting liquids, gases, pasty substances or dust within piping systems, the pig body consisting at least partially of a ferromagnetic substance
- different pig bodies can be distinguished by different geometric structures of the ferromagnetic substances
- a particular advantage of the sensor technology according to the invention is the possibility of differentiation of different ferromagnetic materials without permanent magnetic properties and the combination with permanent magnets of different strengths for position determination (hydraulic cylinder) or identification (pigging technology).
- a sensor 101 can be seen, which is attached to the outer surface of a wall 102 of an actuator.
- This wall 102 can consist, for example, of ferromagnetic material.
- an actuator 103 can be seen that consists of a ferromagnetic material.
- This actuator 103 can be a hydraulic piston.
- FIG. 2 shows a corresponding example of a position determination with an additional improvement in the spatial resolution by the detection of differently sized ferromagnetic masses as a result of a structured front of the actuator 203 Magnetic field, the position of the actuator 103 can be determined more accurately
- FIG. 3 shows an inversely structured front of the actuator 303 in relation to the exemplary embodiment of the actuator in FIG. 2
- FIG. 4 shows a sensor arrangement according to the invention, in which an additional position and position determination of a hydraulic piston can be carried out with the aid of a linear sensor array, which consists of several sensors 401, 402, 403.
- the actuator 404 is again shown with a straight front
- a "coding" of the actuator can also be carried out, for example in accordance with the representation and description of FIGS. 2 and 3
- FIG. 5 shows an example according to the invention for simple pig detection.
- a pig 501 can be seen running along a pipe 502. This pig has a component 503 in its interior made of a ferromagnetic material.
- a magnetic field sensor 504 attached to the outside of the pipe 502 can in turn be used the position of the newt can be recognized
- FIG. 6 shows an example according to the invention for pig detection, but with a structured arrangement of a coding body for individual identification of the respective pig body
- calibration can advantageously be carried out on site by moving the movable body at a defined speed or moving it in defined positions.
- the strength of the magnetic field can then be determined, which is assigned to the respective defined condition a characteristic curve or a characteristic field for the change of the magnetic field at the measurement location are determined, on the basis of which the corresponding size of the movable body can be determined on the basis of the measured magnetic field during operation
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001119703 DE10119703A1 (de) | 2001-04-20 | 2001-04-20 | Vorrichtung zur Erkennung der Position, Bewegungsrichtung und/oder Geschwindigkeit eines Körpers mit ferromagnetischen Eigenschaften sowie Verwendung der Vorrichtung |
DE10119703 | 2001-04-20 | ||
PCT/DE2002/001399 WO2002086423A1 (de) | 2001-04-20 | 2002-04-15 | Vorrichtung zur erkennung der position, bewegungsrichtung und/oder geschwindigkeit eines körpers mit ferromagnetischen eigenschaften |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1379840A1 true EP1379840A1 (de) | 2004-01-14 |
Family
ID=7682311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02737799A Withdrawn EP1379840A1 (de) | 2001-04-20 | 2002-04-15 | Vorrichtung zur erkennung der position, bewegungsrichtung und/oder geschwindigkeit eines körpers mit ferromagnetischen eigenschaften |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1379840A1 (de) |
DE (1) | DE10119703A1 (de) |
WO (1) | WO2002086423A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10250846B4 (de) * | 2002-10-24 | 2006-04-20 | Balluff Gmbh | Positionssensoranordnung |
DE102005020876B4 (de) * | 2004-05-14 | 2010-02-18 | Komatsu Ltd. | Wegmessvorrichtung |
DE102007054969B4 (de) * | 2007-11-17 | 2015-07-16 | Eisenmann Ag | Einrichtung und Verfahren zur berührungslosen Bestimmung einer Zustandsgröße, insbesondere der Position, wenigstens eines Molches |
DE102008052267B4 (de) | 2008-10-18 | 2014-12-24 | Festo Ag & Co. Kg | Messanordnung zur Erfassung der Geschwindigkeit und/oder Relativposition eines Körpers |
EP3816586B1 (de) * | 2019-11-04 | 2023-03-22 | Grant Prideco, Inc. | Magnetisches molchpositionierungssystem und -verfahren |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1282139C (en) * | 1987-06-22 | 1991-03-26 | Mohan Kurup | Monitoring system for position sensing and reciprocating rod used therein |
FR2640530B1 (fr) * | 1988-12-20 | 1992-01-31 | Fmc Europe | Racleur pour conduite de distribution de liquide, notamment pour produits petroliers |
GB9121367D0 (en) * | 1991-10-09 | 1991-11-20 | Emhart Glass Mach Invest | Hall sensor movement detection device |
DE19842719A1 (de) * | 1998-09-18 | 2000-03-23 | Eduard Bautz Gmbh & Co Kg | Anordnung von magnetflußempfindlichen Halbleitern zum Abtasten der Magnetspur von Linearmotoren |
-
2001
- 2001-04-20 DE DE2001119703 patent/DE10119703A1/de not_active Ceased
-
2002
- 2002-04-15 EP EP02737799A patent/EP1379840A1/de not_active Withdrawn
- 2002-04-15 WO PCT/DE2002/001399 patent/WO2002086423A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO02086423A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10119703A1 (de) | 2002-10-31 |
WO2002086423A1 (de) | 2002-10-31 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ZOELLER, K., WILH. Inventor name: KREKOW, GERHARD Inventor name: HARTMANN, UWE |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20051001 |