EP0134792A1 - Dispositif produisant des impulsions magneto-electriques - Google Patents

Dispositif produisant des impulsions magneto-electriques

Info

Publication number
EP0134792A1
EP0134792A1 EP19840900464 EP84900464A EP0134792A1 EP 0134792 A1 EP0134792 A1 EP 0134792A1 EP 19840900464 EP19840900464 EP 19840900464 EP 84900464 A EP84900464 A EP 84900464A EP 0134792 A1 EP0134792 A1 EP 0134792A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
devices
equal
wire
magnetic field
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Withdrawn
Application number
EP19840900464
Other languages
German (de)
English (en)
Inventor
Ho-Sou Chen
Akihisa Inoue
Sungho Jin
Richard Curry Sherwood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of EP0134792A1 publication Critical patent/EP0134792A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0304—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions adapted for large Barkhausen jumps or domain wall rotations, e.g. WIEGAND or MATTEUCCI effect
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices

Definitions

  • the invention is concerned with magneto-electric devices for generating an electrical signal in response to a change in a magnetic field, such as sensors and control devices.
  • Magneto-electric pulse generating devices play a role, e.g., as switches, flowmeters, tachometers, automotive ignition distributors, and proximity sensors in a variety of commercial and industrial applications. Electrical pulses generated by such devices may depend on the rate of change of magnetic flux or, as may be preferred in certain applications, pulses may be velocity- independent.
  • devices of the latter type are devices based on the so-called iegand effect, i.e., on the fact that a suitably processed magnetic wire possesses a cylindrical, magnetically hard outer region and a magnetically soft core portion. Such a wire may be in one of two stable magnetic states, one in which magnetization in outer and inner portions is parallel, and the other in which such magnetizations are antiparallel.
  • the invention is a device for generating an electrical signal in response to a change in a magnetic field, and the device comprises a magnetic element which is essentially a body of a metallic ferromagnetic material having an essentially amorphous structure and having been plastically deformed.
  • the device further comprises an electrical conductor in proximity to the magnetic element, typically in the form of a pickup coil surrounding or adjacent to the magnetic element. In the course of device operation a voltage signal is available at electrical conductor terminals.
  • FIG. 1 is a schematic of a magneto-electric device in accordance with the invention
  • FIG. 2 is a schematic of an alternate magneto- electric device in accordance with the invention.
  • FIGS. 3-6 are graphs depicting magnetic hysteresis loops realized by magnetic elements of the invention.
  • FIG. 1 shows permanent magnet or electromagnet 11 on shaft 12, amorphous magnetic element 13, and pickup coil 14 having terminals 15 and 16.
  • voltage pulses are produced at terminals 15 and 16.
  • Such pulses are attributed to one or several large Barkhausen jumps which, in turn, may be due to a re-entrant loop magnetic effect in magnetic element 13.
  • This effect is characterized in that field strength required to propagate a magnetic domain is less than field strength required to nucleate a domain. Accordingly, once an element is exposed to a field which is sufficient to nucleate a magnetic domain, speed of domain expansion is independent of field strength, and uniform electrical pulses are induced independent of the rate of change of the magnetic field.
  • FIG. 2 shows platform 21 attached to shaft 22 and supporting permanent magnets 23 and 24.
  • Magnetic element 25 is inside pickup coil 26 which has terminals 27 and 28.
  • voltage pulses are produced at terminals 27 and 28.
  • one and the same magnet serves for setting and resetting the magnetic element 13; in FIG. 2 these functions are performed by separate magnets 23 and 24.
  • Magnetic elements 13 and 25 are made, in accordance with the invention, as bodies of a metallic, ferromagnetic, essentially amorphous material which is plastically deformed, preferably in a preferred direction such as, e.g., by wire drawing, swaging, or rolling.
  • Preferred plastic deformation results in cross-sectional area reduction of 1 percent or greater; in the interest of enhanced magnetic squareness and coercive force of the material, such deformation preferably results in 10 percent or greater area reduction. (Alternatively, deformation may be by flattening, in which case preferred thickness reduction is at least 1 percent and preferably at least 10 percent.)
  • Resulting enhanced coercive force is desirable for the sake of safeguarding against accidental switching due to stray magnetic fields.
  • Preferred coercive force is greater than or equal to 39.789 A/m (0.5 oersted) and preferably greater than or equal to 119.366 A/m (1.5 oersted) .
  • compositions suitable for the manufacture of magnetic elements in accordance with the invention can essentially be represented by the formula
  • OMPI greater than or equal to 0 and less than or equal to 1
  • iron content being specified by values of a parameter b_ greater than or equal to 0 and less than or equal to 1
  • one or several transition elements being represented by T and selected from Ni , Cr, Be, Mn, V, Ti, Mo, W, Nb, Zr, Hf, Pd, Pt, Cu, Ag, Au, Ta, Ir, Ru, and Rh and included in the composition in an amount specified by values of the parameter c_ less than or equal to 0.6 and such that a_ plus b plus £ equals 1.
  • X represents one or several glass forming elements selected from the group consisting of P, Si, B, C, As, Ge, Al, Ga, In, Sb, Bi, and Sn.
  • the parameters _i_ and j_ are such that _i_ plus j_ equals 1.
  • Magnetic elements of the- invention are conveniently made in the form of ribbon or wire by quenching from a melt, e.g., by roller quenching or by pressure expulsion into a quenching bath, in contrast to conventional wire making by extensive processing starting with an ingot.
  • Cold deformation of the resulting ribbon or wire is conveniently effected by drawing, rolling, swaging, or flattening, or by any combination thereof; preferred deformation is carried out at temperatures below the recrystallization temperature of an alloy and preferably at a temperature which is less than or equal to 400 degrees C depending on alloy composition.
  • described processing is relatively simple, and relatively small amounts of ordinary wire drawing are sufficient in many instances for desired magnetic squareness and coercive force.
  • high saturation magnetization as is desired in the interest of a strong electrical output signal is readily realized depending on alloy composition, and values greater than or equal to 0.2, 1.0 or even 1.4T (2000, 10,000, or even 14,000 gauss, respectively) can be realized.
  • Devices of the invention typically include the metallic, ferromagnetic, essentially amorphous, plastically deformed element in the form of a wire inside a pickup coil as shown in FIGS. 1 and 2.
  • Such wire has high tensile strength (typically in the range of 200-500 kg/mm") , high stiffness, and high electrical resistivity (typically in the range of 100-300 micro-ohm-cm, thus being relatively free of eddy currents as may be induced especially when a device operates at high frequency.
  • Enhanced mechanical strength and stiffness of the deformed amorphous alloy facilitates device handling and manufacturing involving coil winding and results in ruggedness of a device in operation.
  • Example 1 An amorphous metallic wire having a diameter of approximately 0.13 mm was made by pressure expulsion of a melt through an orifice into water; the melt material had an approximate composition represented by the formula Fe- cSi-, Q B-J 5. The coercive force of the quenched wire was approximately 3.98 A/m (0.05 oersted) . A section of the wire was drawn at room temperature to effect an area reduction of approximately 20 percent, resulting in a diameter of approximately 0.115 mm. A hysteresis loop was determined using a variable magnetic field having a maximum strength of 4464.3 A/m (56.1 oersteds); the resulting hysteresis graph is shown in FIG. 3.
  • Coercive force was 912 A/m (19 oersteds) .
  • the element was tested in a coil having 500 turns. Exposure to a field of approximately 15,915.4 A/m (200 oersteds) produced a voltage pulse of approximately 130 mV at the terminals of the coil, corresponding to a voltage per cross-sectional area per turn of approximately 2.5V/cm .
  • Example 2 Another section of the wire made as described above in Example 1 was wire drawn to effect an area reduction of 80 percent, resulting in a diameter of approximately 0.06 mm. The corresponding hysteresis loop is shown in FIG. 4. Coercive force was 832.4 A/m
  • Example 3 An amorphous metallic wire having a diameter of approximately 0.13 mm was made by pressure expulsion of a melt through an orifice; the melt material had an approximate composition as represented by the formula Co- 5 S ⁇ i2 5 B 15* ⁇ ⁇ e quenched wire had a coercive force of approximately 1.59 A/m (0.02 oersted). A section of the wire was drawn to effect an area reduction of approximately 20 percent, resulting in a diameter of approximately
  • a hysteresis loop was recorded using a variable magnetic field having a maximum strength of 439.27 A/m (5.52 oersteds).
  • the resulting hysteresis graph is shown in FIG. 5.
  • Coercive force was 135.28 A/m (1.7 oersted). The element was tested in a coil having
  • Example 4 Another section of the wire made as described above in Example 3 was wire drawn to effect an area reduction of 60 percent, resulting in a diameter of approximately 0.08 mm. The corresponding hysteresis loop is shown in FIG. 6. The coercive force was approximately 278.52 A/m (3.5 oersteds). Testing in the coil gave approximately 4.8V/cm per turn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Des dispositifs magnéto-électriques produisant un signal électrique en réponse à une variation dans un champ magnétique peuvent produire de préférence des impulsions uniformes indépendantes de la vitesse des variations du champ magnétique. On a réalisé des dispositifs de ce type, ayant recours à ce que l'on appelle l'effet Wiegand, mais ces dispositifs ne sont pas aussi sensibles que ceux qui utilisent un matériau magnétique amorphe. Des dispositifs composés d'un élément métallique ferro-magnétique (13) possèdent généralement une structure essentiellement amorphe qui a subi une déformation plastique à froid. Ces dispositifs ont tendance à limiter leurs réactions à des champs magnétiques intenses, ce qui les rendent plus sensibles. Ces dispositifs possèdant un élément ferro-magnétique peuvent être utilisés dans des clefs, des cartes de crédit et des capteurs de proximité.
EP19840900464 1983-01-24 1983-12-23 Dispositif produisant des impulsions magneto-electriques Withdrawn EP0134792A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46040183A 1983-01-24 1983-01-24
US460401 1983-01-24

Publications (1)

Publication Number Publication Date
EP0134792A1 true EP0134792A1 (fr) 1985-03-27

Family

ID=23828557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840900464 Withdrawn EP0134792A1 (fr) 1983-01-24 1983-12-23 Dispositif produisant des impulsions magneto-electriques

Country Status (4)

Country Link
EP (1) EP0134792A1 (fr)
JP (1) JPS60500356A (fr)
GB (1) GB2137820A (fr)
WO (1) WO1984003010A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009147778A (ja) * 2007-12-17 2009-07-02 Mabuchi Motor Co Ltd パルス信号発生装置、回転機、制御装置およびパワーウィンド制御装置

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774180A (en) * 1971-07-22 1973-11-20 J Wiegand Ferromagnetic memory readout device
US3780313A (en) * 1972-06-23 1973-12-18 Velinsky M Pulse generator
US3893059A (en) * 1974-03-13 1975-07-01 Veeder Industries Inc Pulse generator with asymmetrical multi-pole magnet
US4053332A (en) * 1974-09-20 1977-10-11 University Of Pennsylvania Enhancing magnetic properties of amorphous alloys by rolling
SE7511398L (sv) * 1974-10-21 1976-04-22 Western Electric Co Magnetisk anordning
NL182182C (nl) * 1974-11-29 1988-01-18 Allied Chem Inrichting met amorfe metaallegering.
US4056411A (en) * 1976-05-14 1977-11-01 Ho Sou Chen Method of making magnetic devices including amorphous alloys
US4187128A (en) * 1978-09-26 1980-02-05 Bell Telephone Laboratories, Incorporated Magnetic devices including amorphous alloys
NL7900921A (nl) * 1979-02-06 1980-08-08 Philips Nv Thermomagnetische informatiedrager en optische geheu- geninrichting voorzien van een dergelijke informatie- drager.
US4309628A (en) * 1980-02-22 1982-01-05 The Echlin Manufacturing Company Pulse generation by changing magnetic field
JPS5754251A (en) * 1980-09-15 1982-03-31 Tdk Corp Amorphous magnetic alloy material
JPS5779157A (en) * 1980-10-31 1982-05-18 Sony Corp Manufacture of amorphous magnetic alloy
JPS57160513A (en) * 1981-03-31 1982-10-02 Takeshi Masumoto Maunfacture of amorphous metallic fine wire
US4433474A (en) * 1981-10-08 1984-02-28 Electric Power Research Institute, Inc. Amorphous magnetic core and process for manufacturing to improve efficiency

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8403010A1 *

Also Published As

Publication number Publication date
JPS60500356A (ja) 1985-03-14
GB2137820A (en) 1984-10-10
GB8401559D0 (en) 1984-02-22
WO1984003010A1 (fr) 1984-08-02

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Inventor name: CHEN, HO-SOU

Inventor name: INOUE, AKIHISA

Inventor name: JIN, SUNGHO

Inventor name: SHERWOOD, RICHARD, CURRY