WO2006045210A1 - Induktiver wegaufnehmer (lvdt) mit kurzgeschlossner kopplunggsspule - Google Patents
Induktiver wegaufnehmer (lvdt) mit kurzgeschlossner kopplunggsspule Download PDFInfo
- Publication number
- WO2006045210A1 WO2006045210A1 PCT/CH2005/000604 CH2005000604W WO2006045210A1 WO 2006045210 A1 WO2006045210 A1 WO 2006045210A1 CH 2005000604 W CH2005000604 W CH 2005000604W WO 2006045210 A1 WO2006045210 A1 WO 2006045210A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- coils
- lvdt
- short
- inductive displacement
- Prior art date
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
- G01D5/20—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
- G01D5/204—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 mutual induction between two or more coils
- G01D5/2053—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 mutual induction between two or more coils by a movable non-ferromagnetic conductive element
- G01D5/206—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 mutual induction between two or more coils by a movable non-ferromagnetic conductive element constituting a short-circuiting element
-
- 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
- G01D5/22—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 differentially influencing two coils
- G01D5/225—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 differentially influencing two coils by influencing the mutual induction between the two coils
- G01D5/2275—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 differentially influencing two coils by influencing the mutual induction between the two coils by a movable non-ferromagnetic conductive element
- G01D5/2283—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 differentially influencing two coils by influencing the mutual induction between the two coils by a movable non-ferromagnetic conductive element constituting a short-circuiting element
-
- 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
- G01D5/22—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 differentially influencing two coils
- G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
Definitions
- the invention relates to a position transducer, which is based on the principle of "Linear Variable Differential Transformer” - known under the abbreviation "LVDT".
- LVDT Linear Variable Differential Transformer
- it consists of one or more primary windings and one or more secondary windings, which are usually magnetically coupled to each other via a movable core of ferromagnetic material.
- the mutual inductance between primary and secondary windings is a function of the position of the core relative to the windings.
- the mutual inductance - and thus indirectly a path, a position or a path change - can be measured.
- the detour via the ferromagnetic core is thus avoided: the mutual inductance between the stationary coil (s) and the movable coil or coils is used directly.
- the coils are in ferromagnetic yokes or
- the subject of the present invention is an LVDT which manages without electrical connections to the moving part and, if desired, without ferromagnetic materials.
- the basic idea is to accomplish the coupling between fixed primary and secondary coils via a movable, short-circuited coil.
- the primary coils which are supplied with an alternating current, initially generate an alternating voltage in the moving coil. Because this coil is short-circuited, it generates a short-circuit alternating current. This in turn generates a voltage in the secondary coils, which can then be evaluated.
- the drawing no. 1 shows a system according to the invention.
- the inductive displacement sensor consists of a primary, for example, cylindrical coil (1). To the left and right of it, on a common axis, a secondary coil (2) and (3) are each arranged. Inside these three Coils is an axially displaceable coil (4), which is short-circuited via the conductor (5) in itself.
- the coil (1) is connected to an AC power source. In the coil (4) therefore an AC voltage is induced.
- This alternating voltage has an alternating current in the short-circuited coil (4). Therefore, the coil (4) induces an AC voltage both in the coil (2) and in the coil (3).
- the magnitudes of these two alternating voltages depend on the position of the coil (4). If it is shifted towards the coil (3), the AC voltage in the coil (3) increases while it decreases in the coil (2). If coil (4) is displaced in the direction of coil (2), then the AC voltage in coil (2) increases while it decreases in coil (3).
- the difference of the alternating voltages in the coils (2) and (3) is a measure of the position of the coil (4) and can therefore be converted by the known means into a path signal.
- the LVDT according to the invention works without ferromagnetic parts.
- the LVDT can be screened against foreign, alternating magnetic fields at most without ferromagnetic parts.
- Good conductive screens for example, have the effect that alternating magnetic fields cause eddy currents, which counteract the generating alternating field and weaken it in this way. With this type of umbrellas, the advantages according to the invention are retained.
- Such screens can also be used to prevent the propagation of systemic magnetic fields; this would allow the operation of closely spaced LVDTs operating at the same frequency.
- elements such as resistors, coils and capacitors can be connected in series with the coil (4).
- the material of the coil (4) itself or the material of the associated bobbin can be chosen so that they have favorable, temperature-dependent properties. In order to For example, it can be achieved that the transfer function of the sensor is largely independent of the temperature.
- the linearity of the LVDT can be influenced or improved by making the winding density or the winding diameter of one or more coils into functions of the coordinates of the coil axes.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH17642004 | 2004-10-25 | ||
CH1764/04 | 2004-10-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006045210A1 true WO2006045210A1 (de) | 2006-05-04 |
Family
ID=35519993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2005/000604 WO2006045210A1 (de) | 2004-10-25 | 2005-10-18 | Induktiver wegaufnehmer (lvdt) mit kurzgeschlossner kopplunggsspule |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2006045210A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2000297C2 (nl) * | 2006-11-01 | 2008-05-06 | Bravilor Holding Bv | Drankautomaat met inductieve vloeistof-niveaumeting. |
EP1990610A1 (de) * | 2007-05-08 | 2008-11-12 | Honeywell International Inc. | Positionssensor eines Trockentransformators |
US20150145507A1 (en) * | 2013-11-26 | 2015-05-28 | Honeywell International Inc. | Transformer position sensor with shorted coil |
US10422659B2 (en) | 2014-03-31 | 2019-09-24 | Bombardier Inc. | System for detecting mechanical disconnect of a sensor from a controlled element |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE872404C (de) * | 1943-12-28 | 1953-03-30 | Versuchsanstalt Fuer Luftfahrt | Elektrischer Dehnungs- und Verschiebungsmesser |
DE2224124A1 (de) * | 1972-05-17 | 1973-12-06 | Siemens Ag | Induktiver wegabgriff |
DE8206747U1 (de) * | 1982-03-11 | 1982-09-16 | Robert Bosch Gmbh, 7000 Stuttgart | Lagesensor |
US4723446A (en) * | 1985-04-04 | 1988-02-09 | Kanto Seiki Co., Ltd. | Device for measuring displacement |
DE3918185A1 (de) * | 1989-06-03 | 1990-12-06 | Bosch Gmbh Robert | Wegmesssystem |
US5047715A (en) * | 1987-12-22 | 1991-09-10 | Morgenstern Juergen | Electromagnetic device for position measurement having multiple coils with equal area of turn cross-section |
-
2005
- 2005-10-18 WO PCT/CH2005/000604 patent/WO2006045210A1/de active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE872404C (de) * | 1943-12-28 | 1953-03-30 | Versuchsanstalt Fuer Luftfahrt | Elektrischer Dehnungs- und Verschiebungsmesser |
DE2224124A1 (de) * | 1972-05-17 | 1973-12-06 | Siemens Ag | Induktiver wegabgriff |
DE8206747U1 (de) * | 1982-03-11 | 1982-09-16 | Robert Bosch Gmbh, 7000 Stuttgart | Lagesensor |
US4723446A (en) * | 1985-04-04 | 1988-02-09 | Kanto Seiki Co., Ltd. | Device for measuring displacement |
US5047715A (en) * | 1987-12-22 | 1991-09-10 | Morgenstern Juergen | Electromagnetic device for position measurement having multiple coils with equal area of turn cross-section |
DE3918185A1 (de) * | 1989-06-03 | 1990-12-06 | Bosch Gmbh Robert | Wegmesssystem |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2000297C2 (nl) * | 2006-11-01 | 2008-05-06 | Bravilor Holding Bv | Drankautomaat met inductieve vloeistof-niveaumeting. |
EP1990610A1 (de) * | 2007-05-08 | 2008-11-12 | Honeywell International Inc. | Positionssensor eines Trockentransformators |
US7605585B2 (en) | 2007-05-08 | 2009-10-20 | Honeywell International Inc. | Air-core transformer position sensor |
US20150145507A1 (en) * | 2013-11-26 | 2015-05-28 | Honeywell International Inc. | Transformer position sensor with shorted coil |
US9952064B2 (en) * | 2013-11-26 | 2018-04-24 | Honeywell International Inc. | Transformer position sensor with shorted coil |
US10422659B2 (en) | 2014-03-31 | 2019-09-24 | Bombardier Inc. | System for detecting mechanical disconnect of a sensor from a controlled element |
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