WO2002084221A1 - Detecteur de position magnetique - Google Patents

Detecteur de position magnetique Download PDF

Info

Publication number
WO2002084221A1
WO2002084221A1 PCT/IL2001/000354 IL0100354W WO02084221A1 WO 2002084221 A1 WO2002084221 A1 WO 2002084221A1 IL 0100354 W IL0100354 W IL 0100354W WO 02084221 A1 WO02084221 A1 WO 02084221A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
sensing
sensing element
region
zero
Prior art date
Application number
PCT/IL2001/000354
Other languages
English (en)
Inventor
Alexandru Antonenco
Edward Brook-Levinson
Vladimir Manov
Evgeni Sorkine
Original Assignee
Advanced Coding Systems Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Advanced Coding Systems Ltd. filed Critical Advanced Coding Systems Ltd.
Priority to PCT/IL2001/000354 priority Critical patent/WO2002084221A1/fr
Publication of WO2002084221A1 publication Critical patent/WO2002084221A1/fr

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
    • G01D5/147—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 movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
    • 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
    • G01D5/204—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
    • G01D5/2046—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 ferromagnetic element, e.g. a core

Definitions

  • This invention is generally in the field of position sensors, and relates to a magnetic position sensor, which is particularly useful for non-contact, high precision position detection.
  • a sensing head is capable of detecting a magnetic element located in the vicinity of the sensing head outside the sensing head, and is designed to match a unique response characteristic of the magnetic element material.
  • the elongated magnetic piece of a magnetic element, to be attached to an object that is to be located, is formed of a magnetic material having extremely low coercivity (substantially less than lOA/m) and high permeability (substantially higher than 20000).
  • a magnetic position sensing system for detecting a position of an object having a magnetic element, which is composed of at least one elongated magnetic piece made of a material with a coercivity substantially less than lOA/m and a permeability substantially higher than 20000, the system comprising:
  • extended narrow region signifies a plane-like zone.
  • zero-field plane or "zero-field region” signifies an extended narrow plane-like region or zone characterized in that the two components of a magnetic field vector lying in this plane are substantially equal to zero.
  • This extended zero-field plane presents a sensing area.
  • the elongated magnetic piece is substantially thin, being preferably a glass-coated microwire, which may be produced in a one-stage casting process from an alloy having substantially zero magnetostriction.
  • the microwire has a very small diameter, so that it can be attached to or embedded into any object without causing noticeable changes in the object's form.
  • the microwire element can be embedded also into a separate label attached to the object.
  • a sensing element of the kind producing a response to external magnetic signals the sensing element being located substantially within the zero-field region being thereby responsive to the magnetic signals coming from the vicinity of said narrow region outside the sensing head.
  • Fig. 1 is a schematic illustration of a magnetic position sensing system according to the invention, showing a sensing head and a magnetic element, whose position is to be detected by the sensing head;
  • Fig. 2 graphically illustrates the magnetic characteristics of a magnetic element suitable to be used in the invention
  • Fig. 3 more specifically illustrates the layout of the magnetic element and sensing head in the system of Fig. 1;
  • the microwire 5 may be manufactured, for example, from the Co-Fe-Si-B alloy containing 77.5% Co, 4.5% Fe, 12% Si and 6% B by atomic percentage.
  • the outer diameter of the microwire 5 is about 20 ⁇ _n, and its metal core diameter is about 17 ⁇ m.
  • the microwire material has a high permeability value, i.e., higher than 20000, the hysteresis loop L of such a microwire having a small coercivity value H c which is less than 20A/m (generally less than lOA/m), and the saturation induction value B s being equal to 0.8T.
  • the coercive force values are in the range of 5-10A/m (0.06-0.12 Oe).
  • a glass-coated magnetic microwire material to be used for the preparation of the magnetic element 4 should be characterized by small magnetic coercivity and high permeability values.
  • Such a microwire can be fabricated from amorphous alloys having substantially zero magnetostriction.
  • the techniques of fabricating glass-coated microwires suitable for use in the magnetic element 4 have been developed by the inventors of the present apphcation, and are disclosed, for example, in the article "High Frequency Properties of Glass-Coated Microwire ", A.N. Antonenko, E. Sorkine, A.
  • the sensing head 2 comprises two or more permanent magnets (constituting a magnetic assembly), two such magnets Mi and M2 being shown in the present example.
  • the magnets Mi and M 2 are arranged in a spaced-apart parallel relationship, and are oriented with respect to each other such that their magnetization directions are opposite to each other (perpendicular to the plane of the drawing), namely such that each pole of one magnet faces the opposite pole of the other magnet.
  • Fig. 3 schematically illustrates the layout of the sensor.
  • the permanent magnets Mi and M 2 are preferably identical in size and magnetization value, and are ahgned in a line in a manner to create the zero-field plane 8 between the magnets Mi and M 2 .
  • the sensing element 7 is accommodated such that the zero-field plane preferably coincides with a symmetry plane SP of the sensing element 7.
  • the magnetic field lines configuration for both magnets is partly shown in the figure.
  • Fig. 4 illustrates the main principles of locating the magnetic element 4, i.e., detecting its presence and dete ⁇ nining its position, based on the gradient of the magnetic field vector created by the permanent magnets Mi and M 2 .
  • a graph G presents the distribution of the intensity H of the acting static magnetic field component that is parallel to the zero-field plane, i.e., is directed along the ⁇ -axis of Fig.3, over the x-axis along which the sensing is carried out (i.e., the axis of movement of the sensing head with respect to the object).
  • the intensity H of this acting magnetic field component actually presents a linear function of the distance relative to the plane 8 along the -axis.
  • the microwire of the type selected for the purposes of the present invention is highly anisotropic and provides a noticeable response only to a magnetic field directed along the microwire axis (perpendicular to the jc-axis of displacement). Therefore, only the magnetic field component that is parallel to the microwire axis will affect the microwire. As indicated above, the microwire hysteresis loop is nearly rectangular, and therefore the magnetic core of the microwire will be saturated when the external magnetic field intensity exceeds the microwire coercivity value H c .
  • the gap 16 has the length of 1mm.
  • the coil 12 is supplied with a 100kHz, 3V alternating voltage. It is important to note that the sensing head 2 according to the present invention allows for detecting the magnetic element 4 formed of glass-coated microwire at a considerable distance (0.05 to 1mm) between the sensing head 2 and the magnetic element 4. This is due to the fact that the zero-field region extends along the plane between the magnets, rather than being a small region within a physical gap between the magnets. The magnetic element 4 to be sensed need not be moved through the gap between the magnets, but is to be displaced with respect to the sensing head 2 outside this gap.
  • the amphtude of the output signal decreases by 35%, while the form of the peak remains unchanged.
  • the above performance of the sensing head 2 can be easily understood in terms of the above considerations regarding the microwire response in the vicinity of the zero-field plane 8. Indeed, the measured field gradient of the sensing head 2 at the zero-field plane is approximately 40 Oe/mm, whereas the microwire piece coercivity value H e is less than 0.2Oe.
  • microwire magnetic element 4 is not saturated only if it is located at a distance of 5 ⁇ m or less from the zero-field plane 8, that is, the region of maximum output of the sensing head being about lO ⁇ m, which is clearly seen in the graph.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

La présente invention concerne un système de détection de position magnétique permettant de détecter la position d'un objet (D) pourvu d'un élément magnétique (4). Cet élément magnétique est composé d'au moins une pièce magnétique allongée (5) constituée d'un matériau présentant une coercitivité qui est sensiblement inférieure à 10A/m et une perméabilité qui est sensiblement supérieure à 20 000. Ledit système comprend une tête de détection (2), qui comprend un ensemble magnétique (M1, M2) et un élément de détection (7), ainsi qu'un détecteur (18). Ledit ensemble magnétique (M1, M2) produit un champ magnétique statique à haut gradient et définit une zone de détection se présentant sous forme d'une région étroite et allongée (8), dans laquelle les deux composantes du vecteur de champ magnétique statique sont sensiblement nulles. Ledit élément de détection (7) est situé sensiblement à l'intérieur de ladite région étroite et allongée (8) et est ainsi sensible aux signaux magnétiques externes provenant de la proximité de ladite région, à l'extérieur de la tête de détection (2). Le détecteur (18) reçoit la réponse de l'élément de détection (7) et produit un signal de sortie représentatif de cette réponse. Lorsque ce signal de sortie est représentatif de la réponse de l'élément de détection (7) aux signaux magnétiques externes produits par l'élément magnétique, le signal indique un emplacement de l'objet (D) par rapport à l'élément de détection (7). Ladite pièce magnétique allongée (5) peut consister en un microfil à revêtement de verre.
PCT/IL2001/000354 2001-04-18 2001-04-18 Detecteur de position magnetique WO2002084221A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IL2001/000354 WO2002084221A1 (fr) 2001-04-18 2001-04-18 Detecteur de position magnetique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IL2001/000354 WO2002084221A1 (fr) 2001-04-18 2001-04-18 Detecteur de position magnetique

Publications (1)

Publication Number Publication Date
WO2002084221A1 true WO2002084221A1 (fr) 2002-10-24

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Family Applications (1)

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PCT/IL2001/000354 WO2002084221A1 (fr) 2001-04-18 2001-04-18 Detecteur de position magnetique

Country Status (1)

Country Link
WO (1) WO2002084221A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2475841A (en) * 2009-12-01 2011-06-08 Wireless Fibre Systems Ltd Precision alignment system
CN102322789A (zh) * 2011-07-04 2012-01-18 中北大学 一种基于磁梯度法的水下枪弹着靶参数测量方法
CN114763981A (zh) * 2020-12-31 2022-07-19 株式会社三丰 感应式位置编码器的感测绕组配置
CN114812367A (zh) * 2022-04-26 2022-07-29 北京特倍福电子技术有限公司 一种非接触的外置式磁感应直线位移测量方法
CN115854849A (zh) * 2023-02-03 2023-03-28 江阴天润信息技术有限公司 一种电磁非接触式钢丝在线计米测速方法及其装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299451A (en) * 1991-04-30 1994-04-05 Sagem Allumage First cylinder detector for a gasoline internal combustion engine
DE9412381U1 (de) * 1994-08-01 1994-09-22 Siemens AG, 80333 München Magnetischer Näherungsdetektor
WO1996031790A1 (fr) * 1995-04-04 1996-10-10 Scientific Generics Limited Interrogation spatiale magnetique
US6060881A (en) * 1997-08-06 2000-05-09 Fisher Controls International, Inc. Flux shaping pole pieces for a magnetic displacement sensor
WO2001020568A1 (fr) * 1999-09-10 2001-03-22 Advanced Coding Systems Ltd. Marqueur a micro-fil magnetique amorphe revetu de verre destine a la surveillance d'articles
WO2001029755A1 (fr) * 1999-10-21 2001-04-26 Advanced Coding Systems Ltd. Systeme de securite pour la protection de divers objets et procede de lecture d'une combinaison de codes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299451A (en) * 1991-04-30 1994-04-05 Sagem Allumage First cylinder detector for a gasoline internal combustion engine
DE9412381U1 (de) * 1994-08-01 1994-09-22 Siemens AG, 80333 München Magnetischer Näherungsdetektor
WO1996031790A1 (fr) * 1995-04-04 1996-10-10 Scientific Generics Limited Interrogation spatiale magnetique
US6060881A (en) * 1997-08-06 2000-05-09 Fisher Controls International, Inc. Flux shaping pole pieces for a magnetic displacement sensor
WO2001020568A1 (fr) * 1999-09-10 2001-03-22 Advanced Coding Systems Ltd. Marqueur a micro-fil magnetique amorphe revetu de verre destine a la surveillance d'articles
WO2001029755A1 (fr) * 1999-10-21 2001-04-26 Advanced Coding Systems Ltd. Systeme de securite pour la protection de divers objets et procede de lecture d'une combinaison de codes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2475841A (en) * 2009-12-01 2011-06-08 Wireless Fibre Systems Ltd Precision alignment system
GB2475841B (en) * 2009-12-01 2012-05-30 Wfs Technologies Ltd Precision alignment system
CN102322789A (zh) * 2011-07-04 2012-01-18 中北大学 一种基于磁梯度法的水下枪弹着靶参数测量方法
CN114763981A (zh) * 2020-12-31 2022-07-19 株式会社三丰 感应式位置编码器的感测绕组配置
CN114812367A (zh) * 2022-04-26 2022-07-29 北京特倍福电子技术有限公司 一种非接触的外置式磁感应直线位移测量方法
CN115854849A (zh) * 2023-02-03 2023-03-28 江阴天润信息技术有限公司 一种电磁非接触式钢丝在线计米测速方法及其装置
CN115854849B (zh) * 2023-02-03 2023-09-22 江阴天润信息技术有限公司 一种电磁非接触式钢丝在线计米测速方法及其装置

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