GB2056692A - Magnetic measurement of position and/or speed of a piston - Google Patents
Magnetic measurement of position and/or speed of a piston Download PDFInfo
- Publication number
- GB2056692A GB2056692A GB8026619A GB8026619A GB2056692A GB 2056692 A GB2056692 A GB 2056692A GB 8026619 A GB8026619 A GB 8026619A GB 8026619 A GB8026619 A GB 8026619A GB 2056692 A GB2056692 A GB 2056692A
- Authority
- GB
- United Kingdom
- Prior art keywords
- moving part
- magnetic
- piston
- piston rod
- movement
- 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- Withdrawn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
-
- 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
- F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means
-
- 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
- F15B15/2846—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using detection of markings, e.g. markings on the piston rod
-
- 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
-
- 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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/02—Indicating direction only, e.g. by weather vane
- G01P13/04—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement
- G01P13/045—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement with speed indication
-
- 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
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
- G01P3/54—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring frequency of generated current or voltage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/11—Mounting of sensors thereon
- B60G2204/112—Mounting of sensors thereon on dampers, e.g. fluid dampers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/20—Speed
- B60G2400/202—Piston speed; Relative velocity between vehicle body and wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/25—Stroke; Height; Displacement
- B60G2400/252—Stroke; Height; Displacement vertical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
- B60G2401/17—Magnetic/Electromagnetic
- B60G2401/172—Hall effect
Abstract
A plurality of alternately differing magnetic fields (6, 7) are provided in a piston rod 4 alternating in the direction of movement thereof, and magnetic- field dependent generators (8, 9) are disposed on a stationary part, such as the cylinder or a member which extends within a hollow piston rod Figure 4 (not shown). The magnetic field variation can be of polarity or magnitude. <IMAGE>
Description
SPECIFICATION
Device for the contactless measurement of position and speed
The invention relates to a piston and cylinder device having means for the contactless measurement of the position and/or speed of the moving part of the device.
The control and regulation of piston and cylinder devices, particularly hydraulic and pneumatic units, requires a measuring means by which the instantaneous position and speed of the moving part can be detected. For reasons of wear, it is desirable to be able to sense the measured value in a contactless manner.
In accordance with the invention, this object is achieved in that the moving part carries a plurality of different magnetic fields which alternate in the direction of movemnt of the moving part, and that a magnetic-field-dependent generator is arranged on the stationary part. In a further development of the invention, it is particularly advantageous to dispose north and south poles in an alternating sequence on the surface of the moving part.
Further refinements are disclosed in the illustrated embodiments which will be described hereinafter with reference to the accompanying drawings.
In the drawings:
Figure 1 shows, in accordance with the invention, a hydraulic or pneumatic cylinder in an axial, longitudinal section,
Figure 2 is a graph of the characteristic of a position-dependent voltage U when using a Hall generator as a magnetic field dependent generator,
Figure 3 is a graph relating to another generator, and
Figure 4 shows another embodiment having a hollow-bored piston rod.
Figures 5to 8 are cross sections through a piston rod having magnetic materials arranged in different ways.
In the embodiment of Figure 1, the piston 1 of a hydraulic cylinder 3 is guided in a working bore 2 of the cylinder 3 and is mounted on the end of a piston rod4.
As is shown by the portion of the piston rod drawn to an enlarged scale and indicated at 5, the surface of the piston rod 4 has a plurality of magnetic zones 6 and 7 which are disposed one behind the other in the direction of movement of the piston rod and which are produced in the piston rod, made from magnetizable material, by polarization extending transversely of the longitudinal direction. In the illustrated embodiment, each individual zone 7 is polarized in the opposite direction to that of its adjacent zone 7.
Two magnetic-field-dependent generators 8 and 9, which in the illustrated embodiment can comprise
Hall generators, are located opposite the surface of the piston rod 4 which is magnetically polarized in this manner. Each of the Hall generators generates an output voltage whose magnitude and direction are dependent upon the magnetic field prevailing at the sensing location. The sinusoidal characteristic of the output voltage U (shown in Figure 2) of the Hall generator 8 is then produced in dependence upon the distances covered by the piston.The second Hall generator 9 can be disposed in the cylinder wall 3 so as to be offset in the axial direction of the cylinder, such that its distance from the first Hall generator 8 corresponds to half a pole pitch of the differing magnetic zones 6 and 7, and thus the second Hall generator likewise generates over the distances a sinusoidal voltage which, however, is dephased electrically by 90" relative to that of the first Hall generator and consequently indicates whether the piston 1 is moving forwardly or backwardly.
The pulse-shaped characteristic of the indication voltage Ua illustrated in Figure 3 can be generated by using reed contacts as magnetic-field-dependent generators which close when the magnetic field acting upon them reaches a predetermined minimum intensity. The individual pulses 11, 12, 13 etc.
can be fed in a simple manner to a memory or to a digital counter (not illustrated) which, in accordance with the number of pulses stored, indicates the position reached at any given time.
In the embodiment of Figure 4, the piston rod 4 of the hydraulic device (not otherwise illustrated) incorporates a central longitudinal bore 15 into which extends a stationary sensing rod 16 whose free end carries a magnetic-field-dependent generator, a Hall generator 17 in the illustrated embodiment. A seperately manufactured magnetic strip 18 is disposed on the wall 15 of bore and parallel to the axis (not designated) at the bore. In the same manner as is indicated at 5 in Figure 1, the magnetic strip incorporates north and south magnetic poles which alternate in the direction of movement and which generate in the Hall generator a positive or negative and weak or strong output voltage according to the position of the piston rod.
If it is not possible to make the piston rod from a material in which the magnetization is reliably maintained for the life-time of the device, it is also possible, as is shown by the embodiments of Figure 5 to 8, to introduce into the piston rod 4 a special magnetic material whose fields can be sensed externally by magnetic-field-dependent generators 8 and 9 in the manner shown in Figure 1.
In detail, in the embodiment of Figure 5, a groove 21 is milled along a peripheral surface line of the piston rod 4 which is of circular cross section and which is made from magnetizable or nonmagnetizable material. A magnetic material 22 is placed into the groove 21 and its free outer surface is provided with an alternating magnetic field of the kind indicated at 5 in Figure 1.
In the embodiment of Figure 6, a longitudinal groove 21 is milled in the piston 4 which is also made from magnetizable or non-magnetizable material, although, in contrast to Figure 5, the outside 25 and the longitudinal sides of the magnetic material placed into the groove are additionally encased in non-magnetic material, so that the magnetic material can be better connected to the piston rod and, together therewith, can be ground to obtain a smooth surface. This is particularly advantageous when the magnetic material used is relatively soft as in the case of, for example, plastoferrites.
In the embodiment of Figure 7, a magnetic material 22 is placed into the longitudinal groove 21 in the same manner as in Figure 5, the outside of which magnetic material follows the contour of the cylindrical piston rod 4 and is retained by a shrunk-on, thin-walled tube 26 made from non-magnetic material.
In the embodiment of Figure 8, the piston rod 4 made from non-magnetizable material incorporates a bore 27 which is parallel to the longitudinal axis of the piston rod and which is close to the outer periphery 28 of the piston rod 4 and accommodates an inserted, transversely magnetized magnetic material 29.
In all the embodiments of Figures 5 to 8, the magnetic material is magnetized with alternate polarities at short distances apart and, with respect to one or several magnetic generators of the kind shown at 8 and 9 in Figure 1, results in an alternating magnetic field which, upon adjustment of the piston rod, leads to position-dependent output voltages from the generator or generators. The special advantage of the device in accordance with the invention resides in the fact that it can measure position or speed with a resolution of approximately 1 mum, and that the device can be constructed in a simpie manner and renders it possible to perform measuring operations in a trouble-free manner at locations to which it is difficult to gain access.
It will be understood that instead of using alternatively poled magnetic fields, magnetic fields of different strength could be used i.e. to give relatevly strong and weak fields.
Claims (7)
1. A piston and cylinder device comprising means for the contactless measurement of speed andior position of the moving part of the device, wherein said means comprises a plurality of alternatively differing magnetic fields provided in the moving part of the device and alternating in the direction of movement thereof, and a magnetic-field dependent generator disposed on the stationary part.
2. A device as claimed in claim 1, wherein at least two generators are disposed one behind the other in the direction of movement.
3. A device as claimed in claim 1 or 2, wherein north and south magnetic poles are disposed in an alternating sequence on the surface of the moving part.
4. A device as claimed in claim 1 or 2, wherein the moving part, has a plurality of magnetically relatively weak and strong zones which alternate in the direction of movement of the part.
5. A device as claimed in any of the preceding claims wherein the moving part incorporates a recess which extends in the direction of movement and which accommodates a rod which is made from magnetizable material and which incorporates in its longitudinal direction said magnetic fields.
6. A device according to any of the preceeding claims wherein the moving part is the piston of the device.
7. A piston and cylinder device comprising means for the contactless measurement of the position and/or speed of the moving part of the device, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792933557 DE2933557C2 (en) | 1979-08-18 | 1979-08-18 | Transmitter for non-contact distance or speed measurement |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2056692A true GB2056692A (en) | 1981-03-18 |
Family
ID=6078800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8026619A Withdrawn GB2056692A (en) | 1979-08-18 | 1980-08-15 | Magnetic measurement of position and/or speed of a piston |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS5630602A (en) |
DE (1) | DE2933557C2 (en) |
FR (1) | FR2463933A1 (en) |
GB (1) | GB2056692A (en) |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2503609A1 (en) * | 1979-11-14 | 1982-10-15 | Festo Maschf Stoll G | POSITION DETECTOR FOR WORKING CYLINDER |
FR2513341A1 (en) * | 1981-09-04 | 1983-03-25 | Gewerk Eisenhuette Westfalia | PUSH-PISTON MECHANISM, ESPECIALLY FOR SIZE HYDRAULIC EQUIPMENT, INCLUDING PERMANENT MAGNETS IN THE PISTON ROD, AND METHOD OF MANUFACTURING THE PISTON ROD IN WHICH PERMANENT MAGNETS ARE BORN |
FR2513370A1 (en) * | 1981-09-24 | 1983-03-25 | Gewerk Eisenhuette Westfalia | HYDRAULIC MECHANISM WITH PUSH PISTON, PARTICULARLY FOR USE AS A RIPAGE AND ADVANCING CYLINDER IN UNDERGROUND OPERATIONS, INCLUDING PERMANENT MAGNETS MOUNTED IN THE PISTON ROD |
US4378726A (en) * | 1979-11-24 | 1983-04-05 | Kurt Stoll | Piston designed for use with a magnetic force pickup |
GB2116703A (en) * | 1982-02-25 | 1983-09-28 | Waugh Controls Corp | Position sensor for flowmeter prover |
DE3241525A1 (en) * | 1982-11-10 | 1984-05-10 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | DEVICE FOR DETECTING THE POSITION OR / AND SPEED OF THE PISTON OF A WORK CYLINDER |
GB2131178A (en) * | 1982-11-30 | 1984-06-13 | Peutec Limited | Piston position transducer |
GB2157831A (en) * | 1984-04-06 | 1985-10-30 | Emhart Ind | Magnetically monitoring the movement of a rod |
DE3442879A1 (en) * | 1984-11-24 | 1986-05-28 | Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover | Device for detecting the relative position of two parts which can move with respect to one another |
GB2182151A (en) * | 1985-10-24 | 1987-05-07 | Sokkisha | Coaxial linear magnetic scale apparatus |
US4756229A (en) * | 1986-09-25 | 1988-07-12 | United Technologies Corporation | Digital motor feedback for a position actuator |
US4876945A (en) * | 1987-10-13 | 1989-10-31 | Festo Kg | Piston and cylinder unit |
EP0376496A2 (en) * | 1988-12-28 | 1990-07-04 | Pitney Bowes, Inc. | Mail thickness measuring apparatus |
GB2232770A (en) * | 1989-04-29 | 1990-12-19 | Teves Gmbh Alfred | Travel sensor for measuring mechanical quantities of motion |
EP0421835A1 (en) * | 1989-09-18 | 1991-04-10 | S.N.R. Roulements | High resolution encoder |
US5016519A (en) * | 1984-10-09 | 1991-05-21 | Goedecke Wolf Dieter | Linear drive |
US5024250A (en) * | 1989-01-10 | 1991-06-18 | Nakamura Koki Co., Ltd. | Piston type accumulator for hydraulic system |
WO1991019168A1 (en) * | 1990-05-25 | 1991-12-12 | Remote Marine Systems Limited | Magnetic sensing method and system |
GB2259989A (en) * | 1990-05-25 | 1993-03-31 | Remote Marine Systems Ltd | Magnetic sensing method and system |
EP0559265A1 (en) * | 1992-02-27 | 1993-09-08 | Koninklijke Philips Electronics N.V. | Position sensor system |
EP0578999A1 (en) * | 1992-06-24 | 1994-01-19 | WARREN RUPP, Inc. | Electronic control interface for fluid powered diaphragm pump |
DE9305640U1 (en) * | 1993-04-15 | 1994-08-25 | Hydraulik Techniek | Pressure operated cylinder |
EP0695879A1 (en) * | 1994-08-02 | 1996-02-07 | Festo KG | Power cylinder |
EP0766066A1 (en) * | 1995-09-30 | 1997-04-02 | Dr. Johannes Heidenhain GmbH | Magnetic position measuring device as well as method for operating the same |
FR2746457A1 (en) * | 1996-03-22 | 1997-09-26 | Valeo | Hydraulic slave cylinder for operating clutch thrust bearing for motor vehicles |
FR2795509A1 (en) * | 1999-06-23 | 2000-12-29 | Peugeot Citroen Automobiles Sa | Measurement of the linear displacement of an automobile shock absorber using a simple linear arrangement with a Gray code on one moving part read by a read head on the other moving part |
WO2002001076A3 (en) * | 2000-06-24 | 2002-07-18 | Bosch Gmbh Robert | Hydraulic energy accumulator with metal bellows |
US8857530B2 (en) | 2011-03-07 | 2014-10-14 | Cnh Industrial Canada, Ltd. | Automatic depth control system for an agricultural implement |
WO2023088972A1 (en) * | 2021-11-19 | 2023-05-25 | Université D'evry Val D'essonne | Cylinder with integral position sensor |
Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3014137A1 (en) * | 1980-04-12 | 1981-10-22 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR CONTACTLESS TRAVEL AND / OR SPEED MEASUREMENT |
DE3127116C3 (en) * | 1981-07-09 | 1994-09-01 | Kuhnke Gmbh Kg H | Measuring system for contactless detection of positions in a piston-cylinder unit |
JPS5875023A (en) * | 1981-10-30 | 1983-05-06 | Toshiba Mach Co Ltd | Magnetic scale |
JPS5895202A (en) * | 1981-12-01 | 1983-06-06 | Sony Magnescale Inc | Piston position detector |
DE3227245A1 (en) * | 1982-07-21 | 1984-01-26 | Mannesmann Rexroth GmbH, 8770 Lohr | Displacement sensor |
JPS5935805U (en) * | 1982-08-31 | 1984-03-06 | 日野自動車株式会社 | Shift rod position detection device |
JPS5975101A (en) * | 1982-10-23 | 1984-04-27 | Mitsubishi Heavy Ind Ltd | Stroke measuring device for hydraulic cylinder |
JPS59180425A (en) * | 1983-03-31 | 1984-10-13 | Nec Corp | Magnetic scale and manufacture thereof |
JPS59180424A (en) * | 1983-03-31 | 1984-10-13 | Nec Corp | Magnetic scale and manufacture thereof |
DE3317113A1 (en) | 1983-05-10 | 1984-11-15 | Knorr-Bremse GmbH, 8000 München | POSITIONING DEVICE FOR PISTONLESS CYLINDERS |
JPS60322A (en) * | 1983-06-16 | 1985-01-05 | Nec Corp | Magnetic scale |
DE3417537A1 (en) * | 1984-05-11 | 1985-11-14 | Knorr-Bremse GmbH, 8000 München | Positioning device for a cylinder to which pressure medium can be admitted |
DE3511782A1 (en) * | 1985-03-30 | 1986-10-02 | Daimler-Benz Ag, 7000 Stuttgart | Piston position transmitter |
DE3628278C3 (en) * | 1986-08-20 | 1996-09-26 | Storz E A Kg | Printing cylinder with digital measuring system |
JPS6341706U (en) * | 1986-09-05 | 1988-03-18 | ||
JPS63122902A (en) * | 1986-11-13 | 1988-05-26 | Ckd Controls Ltd | Apparatus for confirming position of moving body |
JPH0736245Y2 (en) * | 1986-12-16 | 1995-08-16 | カヤバ工業株式会社 | Stroke sensor for hydraulic / pneumatic cylinder |
JPH0742082Y2 (en) * | 1986-12-16 | 1995-09-27 | カヤバ工業株式会社 | Hydro-pneumatic cylinder with stroke sensor |
JPS6397805U (en) * | 1986-12-16 | 1988-06-24 | ||
JPH01102701U (en) * | 1987-12-25 | 1989-07-11 | ||
DE3812875C1 (en) * | 1988-04-18 | 1989-04-20 | Deggendorfer Werft Und Eisenbau Gmbh, 8360 Deggendorf, De | Position-data recording system for hydraulic excavators |
DE3826561A1 (en) * | 1988-08-04 | 1990-02-08 | Rexroth Mannesmann Gmbh | Capacitive distance pick-up |
JP2709088B2 (en) * | 1988-08-24 | 1998-02-04 | 株式会社リコー | Rotation amount measurement method |
KR960000342B1 (en) * | 1989-03-14 | 1996-01-05 | 미쯔비시 덴끼 가부시끼가이샤 | Hall-efect sensor with integrally molded frame and plate supported hall element |
DE4234277A1 (en) * | 1992-10-10 | 1994-04-14 | Steingroever Magnet Physik | Magnetic accelerometer and displacement sensor - uses concentric, cylindrical magnets with central Hall sensor giving continued read=out after first displacement |
DE19648335C2 (en) | 1996-11-22 | 2000-05-25 | Daimler Chrysler Ag | Arrangement for position measurement |
DE19726914A1 (en) * | 1997-06-25 | 1999-02-04 | Daimler Benz Ag | Sensor component in hydraulic actuator for power steering in vehicle |
JP4628815B2 (en) * | 2005-02-18 | 2011-02-09 | 株式会社小松製作所 | Cylinder position measuring device |
DE102006010780A1 (en) * | 2006-03-08 | 2007-09-13 | Liebherr-France Sas | Position measuring system for hydraulic cylinders |
DE102008019541A1 (en) * | 2008-04-18 | 2009-10-22 | Wabco Gmbh | Position measuring system |
DE102013205216A1 (en) | 2013-03-25 | 2014-09-25 | Wittenstein Ag | Linear actuator with measuring device for measuring the position of a drive element |
CN103836188B (en) * | 2014-02-27 | 2016-08-24 | 沈阳鑫联石化设备有限公司 | Solar energy safety interlock |
EP3809099B1 (en) * | 2019-10-16 | 2023-03-15 | Ncte Ag | Stroke and velocity measurement on hydraulic, pneumatic and electric cylinders for mobile and stationary applications |
DE102020131245A1 (en) | 2020-11-24 | 2022-05-25 | Inventus Engineering Gmbh | Device with at least one sensor device for acquiring measurement data via a relative movement and scale device |
DE102021100559A1 (en) | 2020-11-24 | 2022-05-25 | Inventus Engineering Gmbh | Device with at least one sensor device for acquiring measurement data via a relative movement and scale device |
DE102021200204A1 (en) | 2021-01-12 | 2022-07-14 | Festo Se & Co. Kg | Fluidic actuator, system and method |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL254347A (en) * | 1959-09-23 |
-
1979
- 1979-08-18 DE DE19792933557 patent/DE2933557C2/en not_active Expired
-
1980
- 1980-08-12 FR FR8017781A patent/FR2463933A1/en active Granted
- 1980-08-15 GB GB8026619A patent/GB2056692A/en not_active Withdrawn
- 1980-08-18 JP JP11276480A patent/JPS5630602A/en active Pending
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2503609A1 (en) * | 1979-11-14 | 1982-10-15 | Festo Maschf Stoll G | POSITION DETECTOR FOR WORKING CYLINDER |
US4378726A (en) * | 1979-11-24 | 1983-04-05 | Kurt Stoll | Piston designed for use with a magnetic force pickup |
FR2513341A1 (en) * | 1981-09-04 | 1983-03-25 | Gewerk Eisenhuette Westfalia | PUSH-PISTON MECHANISM, ESPECIALLY FOR SIZE HYDRAULIC EQUIPMENT, INCLUDING PERMANENT MAGNETS IN THE PISTON ROD, AND METHOD OF MANUFACTURING THE PISTON ROD IN WHICH PERMANENT MAGNETS ARE BORN |
FR2513370A1 (en) * | 1981-09-24 | 1983-03-25 | Gewerk Eisenhuette Westfalia | HYDRAULIC MECHANISM WITH PUSH PISTON, PARTICULARLY FOR USE AS A RIPAGE AND ADVANCING CYLINDER IN UNDERGROUND OPERATIONS, INCLUDING PERMANENT MAGNETS MOUNTED IN THE PISTON ROD |
GB2116703A (en) * | 1982-02-25 | 1983-09-28 | Waugh Controls Corp | Position sensor for flowmeter prover |
DE3241525A1 (en) * | 1982-11-10 | 1984-05-10 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | DEVICE FOR DETECTING THE POSITION OR / AND SPEED OF THE PISTON OF A WORK CYLINDER |
GB2131178A (en) * | 1982-11-30 | 1984-06-13 | Peutec Limited | Piston position transducer |
GB2157831A (en) * | 1984-04-06 | 1985-10-30 | Emhart Ind | Magnetically monitoring the movement of a rod |
US5016519A (en) * | 1984-10-09 | 1991-05-21 | Goedecke Wolf Dieter | Linear drive |
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Also Published As
Publication number | Publication date |
---|---|
DE2933557A1 (en) | 1981-02-26 |
DE2933557C2 (en) | 1982-11-04 |
FR2463933B3 (en) | 1982-06-04 |
JPS5630602A (en) | 1981-03-27 |
FR2463933A1 (en) | 1981-02-27 |
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