WO2016041976A1 - Magnetischer sensor, sensoranordnung und verfahren zur bestimmung der position eines magnetisch wirksamen elements - Google Patents
Magnetischer sensor, sensoranordnung und verfahren zur bestimmung der position eines magnetisch wirksamen elements Download PDFInfo
- Publication number
- WO2016041976A1 WO2016041976A1 PCT/EP2015/071114 EP2015071114W WO2016041976A1 WO 2016041976 A1 WO2016041976 A1 WO 2016041976A1 EP 2015071114 W EP2015071114 W EP 2015071114W WO 2016041976 A1 WO2016041976 A1 WO 2016041976A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- active element
- magnetically active
- path
- sensor
- magnetic sensor
- Prior art date
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000005294 ferromagnetic effect Effects 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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
- G01D5/20—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
- G01D5/2006—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 by influencing the self-induction of one or more coils
- G01D5/2013—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 by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
-
- 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
- G01D5/2006—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 by influencing the self-induction of one or more coils
- G01D5/2033—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 by influencing the self-induction of one or more coils controlling the saturation of a magnetic circuit by means of a movable element, e.g. a magnet
Definitions
- the invention relates to a magnetic sensor for detecting a magnetically active element.
- the invention further relates to a sensor arrangement which has such a magnetic sensor.
- the invention relates to a method for determining the position of a magnetically active element.
- Magnetic sensors can be designed in different ways and used for different detection tasks. They can in particular be used to detect the presence of a magnetically active element, which is typi cally ⁇ is in a magnetically active element is an element, which can change magnetic and / or electrical properties of components disposed in its vicinity.
- the invention relates to a magnetic sensor for detecting a magnetically active element.
- the magnetic sensor has a plurality of measuring coils. This may be a number of, for example, two, three, four, five, eight or any other number of measuring coils, wherein at least two measuring coils are present.
- Each measuring coil has a magnetic core assigned to it.
- the respective magnetic cores are preferably each disposed within a measuring coil which is associated with the magnetic core.
- the measuring coils are arranged along a path. This can for example be straight or curved. Along the path, the measuring coils are electrically connected in series. Furthermore, the measuring coils have respective inductances which increase along the path in one direction. This may in particular mean that a respective inductance of a measuring coil arranged in a certain direction behind another measuring coil is greater than the inductance of the other measuring coil.
- the measuring coils are preferably SMD-mountable and / or compatible with SMD placement machines.
- the magnetic sensor is the ⁇ according to means of surface mounted device (SMD) technology equipped.
- SMD surface mounted device
- the magnetic sensor is configured to generate a common output signal depending on a position of the magnetically active element along the path.
- the common output signal is a total inductance. This is a total inductance of the measuring coils connected in series.
- common output signals may be used, for example, a resonant frequency at an addition to the series-connected sensing coil with a capacitor to form a resonant circuit, or even a loss angle of the ge ⁇ series connected sensing coils. It should be understood that also two such common output signals can be used to read out the magnetic sensor.
- the magnetically active element is preferably a ferromagnetic high-permeability body, an electrically conductive body or a permanent magnet.
- a ferromagnetic, highly permeable body When a ferromagnetic, highly permeable body is arranged in the vicinity of a measuring coil, the body acts as a flux conductor ⁇ . The flow through the body depends on the position and / or angle of the body relative to the inductance. This will change the inductance value.
- an electrically conductive body is placed in the vicinity of a measuring coil, an eddy current flows through the body by induction, this eddy current depending on the position and / or angle of the body relative to the inductance. As a result, the inductance value and the loss resistance are changed.
- the magnet When a permanent magnet is placed in the vicinity of a sensor inductance, the magnet generates a flux that can saturate a ferromagnetic high-permeability body arranged to act as a core of a measuring coil.
- the flow through the body for example through the core A measuring coil depends on the position and / or angle of the magnet relative to the inductance. As a result, the inductance value is predominantly changed.
- the respective magnetic cores preferably have no remanent magnetization. This may mean, for example, that they have only a magnetization of a negligible value, which is irrelevant to a measurement. If the respective magnetic cores have no magnetization, they have a particularly high permeability, since the curve of magnetic flux density B as a function of a magnetic ⁇ field strength H at this point has a particularly high slope. This allows a particularly good and accurate measurement.
- the measuring coils are preferably arranged on a printed circuit board, a leadframe or a Molded Interconnected Devices (MID) carrier.
- MID Molded Interconnected Devices
- An MID carrier is understood in particular to be a spatially injection-molded circuit carrier. Such embodiments have proved to be advantageous.
- each measuring coil is made of deposited and structured and / or laminated layers of a metal, in particular a light metal, copper or an alloy with nickel and / or palladium and a ferromagnetic material.
- a metal in particular a light metal, copper or an alloy with nickel and / or palladium and a ferromagnetic material.
- a technology such as a multilayer ceramic capacitor (MLCC) may be used.
- the ferromagnetic material is preferably a high permeability material.
- Such measuring coils can also be designed, for example, as SMD ferrite beads, SMD multilayer inductors or as wire-wound SMD inductors. These SMD devices typically also include a core.
- the measuring coils are spaced so close to each other that when moving a magnetically active element along the path results in a characteristic of the total inductance, which is at least over half of the path, preferably over at least three quarters of the path, monotonically increasing or decreasing.
- a characteristic of the total inductance which is at least over half of the path, preferably over at least three quarters of the path, monotonically increasing or decreasing.
- the invention further relates to a sensor arrangement.
- the sensor arrangement has a magnetic sensor according to the invention. It can be used on all described versions and variants. Illustrated benefits apply accordingly.
- the sensor assembly further includes a magnetically active element as well as a guide for the like ⁇ genetically active element.
- the guide is designed such that the magnetically active element is movable along the path.
- the magnetically active element preferably comprises a supply ⁇ Actuate the limb, by means of which it is movable from outside the guide along the path.
- This actuator can then be connected for example outside the sensor with a component whose movement is to be measured relative to another component. If the remaining part of the sensor arrangement is connected to the other component, the movement of the component to be measured can be transmitted via the actuator to the magnetically active element, the position of which can in turn be measured in the manner described above.
- the magnetically active element is preferably a ferromagnetic high-permeability body, an electrically conductive body or a permanent magnet. Regarding the possible details and functions referred to further above from ⁇ guides this.
- SMD inductors In the case of using a ferromagnetic high-permeability body or an electrically conductive body, conventional SMD inductors have proven to be particularly advantageous as open-loop sensing coils. SMD ferrite beads and SMD multilayer inductors with ge ⁇ patentedem magnetic circuit have, however, be particularly proven advantageous for use in conjunction with a permanent magnet.
- the sensor arrangement further preferably has a measuring circuit for determining a total inductance of the measuring coils. This allows an integrated readout of the sensor arrangement by the own measuring circuit. It can be used in particular on proven designs.
- the total inductance can be understood as a complex impedance with two real parameters. For example, this may be inductance and series resistance, the amount of impedance and loss angle, or inductance and quality.
- a measuring circuit is preferably able to determine at least one of these parameters or both together.
- the invention further relates to a method for determining the position of a magnetically active element, the method comprising the following steps:
- a magnetic sensor according OF INVENTION ⁇ -making can be preferably used to determine a position of a magnetically active element.
- the magnetic sensor to all embodiments and variants described above may be resorted back ⁇ . Illustrated benefits apply accordingly.
- the magnetically active element may in particular be designed according to ⁇ least one of the embodiments as explained above.
- the method preferably further comprises a step of changing the position of the magnetically active element along the path.
- a step of changing the position of the magnetically active element along the path In such a step, the resulting new position of the magnetically active element in the manner described above can be particularly advantageously measured.
- the magnetically active element is preferably a ferromagnetic high-permeability body, an electrically conductive body or a permanent magnet. Further details and workings of this is ver ⁇ pointed to the above statements.
- the senor is part of a sensor arrangement according to the invention.
- versions and variants of Sensoran ⁇ properly described all the above can be drawn. Illustrated benefits apply accordingly.
- the advantages of a sensor arrangement according to the invention described above for the inventive method can be utilized.
- FIG. 2 shows a characteristic of the sensor of FIG. 1.
- the sensor arrangement 10 has a sensor 5.
- the sensor 5 has a total of six measuring coils L I, L2, L3, L4, L5, L6, which are mounted on a printed circuit board, not shown.
- Each of the measuring coils has a respective associated core K1, K2, K3, K4, K5, K6.
- the nuclei Kl, K2, K3, K4, K5, K6 are not magnetized in the ground state.
- the measuring coils L I, L2, L3, L4, L5, L6 are electrically connected in series as shown. They are geometrically arranged along a path given by their arrangement, which is straight.
- the relation L I ⁇ L2 ⁇ L3 ⁇ L4 ⁇ L5 ⁇ L6 applies.
- the inductances thus increase from left to right.
- each measuring coil has an inductance, which is increased by 50% compared to the inductance of the measuring coil immediately to the left of it.
- the sensor arrangement 10 also has a guide 20.
- the guide 20 is arranged directly above the path predetermined by the measuring coils LI, L2, L3, L4, L5, L6.
- a magnetically active element is arranged in the form of a Perma ⁇ mag- nets 30th
- the permanent magnet 30 can be displaced in the guide 20 along the path.
- the permanent magnet 30 is connected to an actuator in the form of a rod 35.
- the rod 35 can be connected to a component whose movement relative to the sensor 5 is to be measured. A movement of the component, not shown, is then transmitted via the rod 35 to the permanent magnet 30, which moves along the path in the guide 20 accordingly.
- the sensor arrangement 10 also has a measuring circuit 40, which is designed in a known manner.
- the measuring circuit 40 is designed to measure a total inductance of the series-connected measuring coils LI, L2, L3, L4, L5, L6.
- FIG. 2 shows a typical characteristic curve of the sensor 5 of FIG. 1.
- a dimensionless variable s is indicated on the horizontal axis as a measure of a displacement of the permanent magnet 30 along the path.
- an equally dimensionless quantity M is given as a measure of a value measured by the measuring circuit 40. This is a value which is calculated from the total inductance of the sensor 5.
- a position of a component connected to the permanent magnet 30 via the rod 35 can also be concluded. This allows the sensor 5 are used as part of the sensor assembly 10 for measuring relative movements.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15766129.9A EP3194895A1 (de) | 2014-09-18 | 2015-09-15 | Magnetischer sensor, sensoranordnung und verfahren zur bestimmung der position eines magnetisch wirksamen elements |
US15/504,755 US20170276517A1 (en) | 2014-09-18 | 2015-09-15 | Magnetic sensor, sensor arrangement and method for determining the position of a magnetically active element |
KR1020177007493A KR20170043618A (ko) | 2014-09-18 | 2015-09-15 | 자기 센서, 센서 배열체, 및 자기 능동 소자의 위치 결정 방법 |
CN201580047396.8A CN107076579A (zh) | 2014-09-18 | 2015-09-15 | 磁传感器、传感器装置和用于确定磁有效元件的位置的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014218754.0A DE102014218754A1 (de) | 2014-09-18 | 2014-09-18 | Magnetischer Sensor, Sensoranordnung und Verfahren zur Bestimmung der Position eines magnetisch wirksamen Elements |
DE102014218754.0 | 2014-09-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016041976A1 true WO2016041976A1 (de) | 2016-03-24 |
Family
ID=54147188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2015/071114 WO2016041976A1 (de) | 2014-09-18 | 2015-09-15 | Magnetischer sensor, sensoranordnung und verfahren zur bestimmung der position eines magnetisch wirksamen elements |
Country Status (6)
Country | Link |
---|---|
US (1) | US20170276517A1 (de) |
EP (1) | EP3194895A1 (de) |
KR (1) | KR20170043618A (de) |
CN (1) | CN107076579A (de) |
DE (1) | DE102014218754A1 (de) |
WO (1) | WO2016041976A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016202402A1 (de) | 2016-02-17 | 2017-08-17 | Continental Teves Ag & Co. Ohg | Sensor |
DE102016202403A1 (de) * | 2016-02-17 | 2017-08-17 | Continental Teves Ag & Co. Ohg | Sensor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10227425A1 (de) * | 2002-06-20 | 2004-01-08 | Werner Turck Gmbh & Co. Kg | Induktives Wegmessgerät |
DE10342473A1 (de) * | 2003-09-15 | 2005-05-04 | Sick Ag | Magnetischer Wegsensor |
DE102006061771A1 (de) * | 2006-12-28 | 2008-07-03 | Sick Ag | Magnetischer Wegsensor mit linearer Kennlinie des Ausgangssignals |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1272568B (de) * | 1964-03-14 | 1968-07-11 | Philips Patentverwaltung | Aufnehmer zur induktiven Wegmessung mit zwei koaxial angeordneten Spulen |
DE1284101B (de) * | 1966-11-16 | 1968-11-28 | Philips Patentverwaltung | Anordnung zur beruehrungslosen Verschiebungsmessung |
DE2300945A1 (de) * | 1973-01-10 | 1974-07-11 | Gerdts Gustav F Kg | Vorrichtung zur hubkontrolle |
GB2121182B (en) * | 1981-07-10 | 1985-07-24 | Lucas Ind Plc | Linear inductive transducer |
JPH02116712A (ja) * | 1988-10-27 | 1990-05-01 | Makome Kenkyusho:Kk | 変位測定装置 |
CN2083740U (zh) * | 1991-01-18 | 1991-08-28 | 杭州高联传感技术公司 | 磁效应位移传感器 |
DE4128159A1 (de) * | 1991-08-24 | 1993-02-25 | Bosch Gmbh Robert | Messeinrichtung zur beruehrungsfreien bestimmung des wegs oder des drehwinkels eines bauteils |
US6512360B1 (en) * | 1999-03-15 | 2003-01-28 | Amiteq Co., Ltd | Self-induction-type stroke sensor |
JP2001272201A (ja) * | 2000-03-27 | 2001-10-05 | Sony Precision Technology Inc | 位置検出装置 |
JP3888427B2 (ja) * | 2001-10-30 | 2007-03-07 | 学校法人日本大学 | 変位センサ |
DE102010042408A1 (de) * | 2010-07-29 | 2012-02-02 | Ebe Elektro-Bau-Elemente Gmbh | Elektrische Weggeberanordnung |
EP2951536A1 (de) * | 2013-02-01 | 2015-12-09 | Continental Teves AG & Co. oHG | Verfahren zum herstellen eines messaufnehmers |
US9291648B2 (en) * | 2013-08-07 | 2016-03-22 | Texas Instruments Incorporated | Hybrid closed-loop/open-loop magnetic current sensor |
-
2014
- 2014-09-18 DE DE102014218754.0A patent/DE102014218754A1/de not_active Withdrawn
-
2015
- 2015-09-15 US US15/504,755 patent/US20170276517A1/en not_active Abandoned
- 2015-09-15 KR KR1020177007493A patent/KR20170043618A/ko not_active Application Discontinuation
- 2015-09-15 CN CN201580047396.8A patent/CN107076579A/zh active Pending
- 2015-09-15 EP EP15766129.9A patent/EP3194895A1/de not_active Ceased
- 2015-09-15 WO PCT/EP2015/071114 patent/WO2016041976A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10227425A1 (de) * | 2002-06-20 | 2004-01-08 | Werner Turck Gmbh & Co. Kg | Induktives Wegmessgerät |
DE10342473A1 (de) * | 2003-09-15 | 2005-05-04 | Sick Ag | Magnetischer Wegsensor |
DE102006061771A1 (de) * | 2006-12-28 | 2008-07-03 | Sick Ag | Magnetischer Wegsensor mit linearer Kennlinie des Ausgangssignals |
Also Published As
Publication number | Publication date |
---|---|
EP3194895A1 (de) | 2017-07-26 |
CN107076579A (zh) | 2017-08-18 |
DE102014218754A1 (de) | 2016-03-24 |
US20170276517A1 (en) | 2017-09-28 |
KR20170043618A (ko) | 2017-04-21 |
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