EP3218613A1 - Système avec cible magnétique et capteur - Google Patents
Système avec cible magnétique et capteurInfo
- Publication number
- EP3218613A1 EP3218613A1 EP15817931.7A EP15817931A EP3218613A1 EP 3218613 A1 EP3218613 A1 EP 3218613A1 EP 15817931 A EP15817931 A EP 15817931A EP 3218613 A1 EP3218613 A1 EP 3218613A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnets
- magnetic field
- sliding
- target
- magnetic
- 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- Withdrawn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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
Definitions
- the present invention relates to a magnetic target, in particular arranged to be mounted on a component capable of sliding.
- the aim of the invention is to improve this type of magnetic target.
- the invention thus relates in particular to a magnetic target, in particular arranged to be mounted on a component capable of sliding along an axis, this component notably being a piston, this target comprising:
- having the two separate magnets reduces the magnetic field in the space between the magnets, which allows to have a more intense magnetic field near the axial ends of the target. Due to these higher fields in the useful areas, the target and an associated sensor are less susceptible to external magnetic interference. Moreover, the amount of magnet to be used is reduced, which makes it possible to be more economical.
- the invention makes it possible to have a strong magnetic slope, which is favorable in the case of commutation or "switch" by allowing a better precision of the commutation.
- the invention can thus allow to have a single type of magnets for two types of applications, namely in linear and switching.
- two short magnets are generally easier to manufacture than a long magnet.
- the magnets are arranged to produce a magnetic field at least a portion of the field lines is perpendicular to the axis of sliding of the component.
- one of the magnets is arranged to produce a magnetic field with a first sense of magnetization and the other magnet is arranged to produce a magnetic field with a second sense of magnetization opposite the first direction of magnetization, the first and second sense of magnetization. magnetization being notably parallel and opposite.
- At least one of the magnets preferably has a radially outer wall substantially in a portion of a cylinder, in particular in a portion of a cylinder of revolution.
- the magnets can have identical shapes and dimensions.
- the accumulated magnetic field advantageously produced by the two magnets has a minimum amplitude in a space between the two magnets.
- this minimum amplitude is between 20 milliTesIa and 30mT, in particular between 20 mT and 25 mT.
- the magnetic field advantageously has two maxima each associated with one of the magnets.
- one of the maxima is between 30 mT and 35 mT.
- the magnetic field has minimum values at the ends and in the middle of the sliding component stroke.
- the minimum values at the ends of the stroke can optimize the volume of the magnets and thus reduce the cost.
- the target may include a spacer arranged in the nonmagnetic space.
- the spacer is made of plastic.
- the spacer advantageously has a wall portion of a cylinder. Where appropriate the spacer has an outer wall in the extension of outer walls of the magnets.
- the space between the two magnets is formed by air.
- At least one of the magnets has a cylindrical shape, in particular of revolution, of axis parallel to the axis of sliding.
- At least one of the magnets may have a semi-cylindrical shape of revolution, with an axis parallel to the sliding axis.
- the at least one of the magnets comprises a flat face, in particular parallel to the sliding axis, in particular two parallel plane faces.
- At least one of magnets is made of ferrite.
- At least one magnet is made of rare earth.
- the target comprises at least three magnets including substantially aligned.
- the invention also relates to a component capable of sliding along a sliding axis comprising a target as described above.
- the component advantageously forms a piston.
- This piston is in particular able to move on a predetermined stroke.
- the target is for example at least partially inserted into a piston body.
- the piston is advantageously arranged to operate with a clutch system, in particular operating by hydraulic pressure.
- the invention further relates to a system, in particular for a motor vehicle, comprising:
- a sensor arranged to be sensitive to the magnetic field generated by the target, in particular so as to provide a information representative of the position or speed of the sliding component.
- the position or speed could be replaced by another parameter of the sliding component.
- the magnetic field produced by the magnets is maximum at the ends of the race of the sliding component, in places where a measurement by the sensor must be made accurately.
- the sensor is for example Hall effect.
- the senor and the target are associated with a clutch system, in particular by hydraulic pressure, with a brake pedal, a turbo actuator or a valve, in particular an exhaust gas recirculation valve.
- FIG. 1 is a schematic and partial sectional view of a system according to an exemplary embodiment of the invention
- FIG. 2 represents, schematically and partially, a target of the system of FIG. 1, and
- FIG. 3 illustrates the variation of the magnetic field produced by the target of FIG. 2 as a function of the travel of the sliding component.
- FIG. 1 shows a system 1 for a motor vehicle, comprising:
- a component 2 capable of sliding along an axis of sliding X and comprising a magnetic target 3,
- a sensor 4 arranged to be sensitive to the magnetic field generated by the target 3, so as to provide information representative of the position or speed of the sliding component 2.
- Component 2 is a piston capable of moving on a predetermined path S.
- the target 3 is carried by a body 6 of the piston 2.
- the piston 2 is, in the example described, arranged to operate with a clutch system operating by hydraulic pressure.
- the sensor 4 is mounted on a printed circuit board 7, for example by welding.
- the sensor 4 is Hall effect.
- This sensor may be a linear or switching sensor ("Switch").
- the magnetic target 3 comprises two magnets 10 and 1 1 separated by non-magnetic space 12.
- the sensor 4 is positioned centrally, in a direction perpendicular to the axis X, with respect to the magnets 10 and 11.
- the magnets 10 and 11 are arranged to produce a magnetic field M whose field lines are perpendicular to the sliding axis X of the piston 2.
- field lines make an angle with the X axis greater or smaller than 90 °.
- the magnet 10 is arranged to produce a magnetic field with a first sense of magnetization and the other magnet 11 is arranged to produce a magnetic field with a second direction of magnetization opposite to the first direction of magnetization.
- the first and second sense of magnetization being in particular parallel and opposite.
- the fact of having the two magnets 10 and 1 1 separated makes it possible to reduce the magnetic field in the space between the magnets 10 and 1 1, which makes it possible to have a stronger magnetic field near the axial ends 14 and 15 of the target 3. Thanks to these higher fields in the useful zones, the target 3 and the associated sensor 4 are less sensitive to external magnetic interference and the measurements are more precise.
- the cumulative magnetic field produced by the two magnets 10 and 1 1 has a minimum amplitude in a space 12 between the two magnets, as visible on the curve C1.
- This minimum amplitude is between 20 mT and 25 mT.
- the magnetic field has two maxima on both sides of this minima.
- maxima are in particular substantially equal and are between 30 mT and 35 mT.
- the invention makes it possible in particular to reduce the volume of the magnets with respect to the case of the curve C2 with a long single magnet.
- the magnets 10 and 1 1 each have a radially outer wall 20 substantially in the form of a cylinder of revolution.
- Magnets 10 and 1 1 have identical shapes and dimensions.
- the target 3 comprises a spacer 22 arranged in the non-magnetic space 12.
- the spacer 22 is made of plastic and has a cylinder-shaped wall 23 in the extension of outer walls 24 of the magnets 10 and 11.
- the magnets 10 and 1 1 have a semi-cylindrical shape of revolution, of axis parallel to the axis of sliding X.
- the magnets 10 and 1 1 are made of ferrite.
- the piston may be equipped with an anti-rotation system, if necessary.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Actuator (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1460996A FR3028613A1 (fr) | 2014-11-14 | 2014-11-14 | Cible magnetique |
PCT/FR2015/053075 WO2016075420A1 (fr) | 2014-11-14 | 2015-11-16 | Système avec cible magnétique et capteur |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3218613A1 true EP3218613A1 (fr) | 2017-09-20 |
Family
ID=52684356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15817931.7A Withdrawn EP3218613A1 (fr) | 2014-11-14 | 2015-11-16 | Système avec cible magnétique et capteur |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3218613A1 (fr) |
FR (1) | FR3028613A1 (fr) |
WO (1) | WO2016075420A1 (fr) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07113524B2 (ja) * | 1985-08-09 | 1995-12-06 | 株式会社東海理化電機製作所 | 磁気抵抗素子を用いた位置検出装置 |
DE3644979A1 (de) * | 1986-12-24 | 1988-07-07 | Pav Praezisions Apparatebau Ag | Messkluppe |
DE3720524A1 (de) * | 1987-06-20 | 1988-12-29 | Pav Praezisions Apparatebau Ag | Messkluppe |
JPH0656302B2 (ja) * | 1988-11-18 | 1994-07-27 | 株式会社マコメ研究所 | 磁気スケール |
DE19711781C2 (de) * | 1997-03-12 | 2000-05-31 | Pepperl & Fuchs | Vorrichtung zur Positionserfassung eines beweglich angeordneten Magneten zum Erzeugen eines magnetischen Feldes durch eine Wandung aus ferromagnetischem Material hindurch, insbesondere Stellantrieb mit bewegbarem Stellglied |
DE10053995A1 (de) * | 2000-10-31 | 2002-05-08 | Continental Teves Ag & Co Ohg | In einen Hauptzylinder integrierter Signalgeber mit Hall-Sensor |
DE10304551A1 (de) * | 2003-02-04 | 2004-08-12 | Mann + Hummel Gmbh | Stellelement mit Lageerkennung |
US8742632B1 (en) * | 2010-06-29 | 2014-06-03 | Moticont | Linear motor with two magnets and a coil carrier having multiple winding areas with each area having a section of a coil wound with one continuous wire, or separate coils respectively wound around each area with all coils wound in the same direction |
-
2014
- 2014-11-14 FR FR1460996A patent/FR3028613A1/fr active Pending
-
2015
- 2015-11-16 EP EP15817931.7A patent/EP3218613A1/fr not_active Withdrawn
- 2015-11-16 WO PCT/FR2015/053075 patent/WO2016075420A1/fr active Application Filing
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2016075420A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR3028613A1 (fr) | 2016-05-20 |
WO2016075420A1 (fr) | 2016-05-19 |
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17Q | First examination report despatched |
Effective date: 20180613 |
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17Q | First examination report despatched |
Effective date: 20180718 |
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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: 20190129 |