CA2108157A1 - Aimant permanent - Google Patents

Aimant permanent

Info

Publication number
CA2108157A1
CA2108157A1 CA 2108157 CA2108157A CA2108157A1 CA 2108157 A1 CA2108157 A1 CA 2108157A1 CA 2108157 CA2108157 CA 2108157 CA 2108157 A CA2108157 A CA 2108157A CA 2108157 A1 CA2108157 A1 CA 2108157A1
Authority
CA
Canada
Prior art keywords
pole pieces
permanent magnets
magnet assembly
permanent magnet
central spacer
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.)
Granted
Application number
CA 2108157
Other languages
English (en)
Other versions
CA2108157C (fr
Inventor
Uri Rapoport
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.)
Qualion Ltd
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE69116172T priority Critical patent/DE69116172T2/de
Priority to PCT/EP1991/000716 priority patent/WO1992018993A1/fr
Priority to CA002108157A priority patent/CA2108157C/fr
Priority to EP91907658A priority patent/EP0579598B1/fr
Publication of CA2108157A1 publication Critical patent/CA2108157A1/fr
Application granted granted Critical
Publication of CA2108157C publication Critical patent/CA2108157C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

Ensemble à aimants permanents utilisé notamment dans les études de résonance magnétique et doté d'une pièce centrale d'écartement (C) dans laquelle sont ménagés des évidements opposés et peu profonds (96, 98) dans lesquels s'engagent les parties terminales de pièces polaires afin d'assurer l'alignement de celles-ci. Les aimants permanents principaux (F, G) butent contre les pièces polaires au niveau des faces de celles-ci qui sont opposées à la pièce centrale d'écartement (C). Lesdits aimants permanents principaux chevauchent dans le sens de l'extérieur une interface périphérique (38, 48) entre les pièces polaires et une pluralité d'aimants permanents latéraux (32a, e, 42a, e) afin de minimiser les fuites de flux au niveau de ladite interface.
CA002108157A 1991-04-12 1991-04-12 Aimant permanent Expired - Fee Related CA2108157C (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69116172T DE69116172T2 (de) 1991-04-12 1991-04-12 Permanentmagnetanordnung
PCT/EP1991/000716 WO1992018993A1 (fr) 1991-04-12 1991-04-12 Ensemble a aimants permanents
CA002108157A CA2108157C (fr) 1991-04-12 1991-04-12 Aimant permanent
EP91907658A EP0579598B1 (fr) 1991-04-12 1991-04-12 Ensemble a aimants permanents

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP1991/000716 WO1992018993A1 (fr) 1991-04-12 1991-04-12 Ensemble a aimants permanents
CA002108157A CA2108157C (fr) 1991-04-12 1991-04-12 Aimant permanent

Publications (2)

Publication Number Publication Date
CA2108157A1 true CA2108157A1 (fr) 1992-10-13
CA2108157C CA2108157C (fr) 2000-07-18

Family

ID=25676726

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002108157A Expired - Fee Related CA2108157C (fr) 1991-04-12 1991-04-12 Aimant permanent

Country Status (2)

Country Link
CA (1) CA2108157C (fr)
WO (1) WO1992018993A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI93060C (fi) * 1992-07-03 1995-02-10 Picker Nordstar Oy Laitteisto ja menetelmä magneettikuvaukseen
US5978694A (en) * 1997-02-27 1999-11-02 Uri Rapoport Method and apparatus for detecting a magnetically responsive substance

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611223A (en) * 1968-09-11 1971-10-05 Hitachi Ltd Magnetic apparatus for producing homogeneous field
US4707663A (en) * 1985-08-15 1987-11-17 Fonar Corporation Nuclear magnetic resonance apparatus using low energy magnetic elements
US4675609A (en) * 1985-09-18 1987-06-23 Fonar Corporation Nuclear magnetic resonance apparatus including permanent magnet configuration
US4692732A (en) * 1986-05-30 1987-09-08 The United States Of America As Represented By The Secretary Of The Army Remanence varying in a leakage free permanent magnet field source
US4998976A (en) * 1987-10-07 1991-03-12 Uri Rapoport Permanent magnet arrangement

Also Published As

Publication number Publication date
CA2108157C (fr) 2000-07-18
WO1992018993A1 (fr) 1992-10-29

Similar Documents

Publication Publication Date Title
FR2534511B1 (fr) Porte-piece magnetique a aimants permanents dont l'etat d'aimantation est commutable
EP0760484A3 (fr) Circuit magnétique avec aimants permanents montés en opposition
IT8667180A1 (it) Perfezionamenti a mezzi di chiusura magnetici provvisti di magneti permanenti.
DE3671566D1 (de) Ferromagnetische abschirmung fuer magnetische resonanzmagnete.
CA2369956A1 (fr) Dispositif a rotor
EP0217520A3 (fr) Structure de champ de gradient et procédé d'utilisation dans un appareil d'imagerie par résonance magnétique
DE69921807D1 (de) Magnetisch verankerte aufbausysteme
AU1194199A (en) Single dipole permanent magnet structure with linear gradient magnetic field intensity
DE3467951D1 (en) Electromagnet with yokes and an armature having a permanent magnet with pole pieces at its pole faces protecting beyond the magnet axis, this axis being perpendicular to the direcion of movement
MX9207411A (es) Transductores de armadura balanceada con intervalotransversal.
KR900008082B1 (en) Operating apparatus for objective lens
AU629547B2 (en) Magnetic valve with permanent magnet closing force
TW304005U (en) Radial anisotropic cylinder type ferrite magnets and motors
FR2685144B1 (fr) Transducteur electromagnetique a aimant permanent multipolaire.
EP0232897A3 (fr) Dispositif électromagnétique
EP0709696A3 (fr) Dispositif à aimant permanent muni d'un élément magnétorésistif pour la détection/authentification des documents magnétiques
GB9302496D0 (en) Permanent magnet rotor
CA2108157A1 (fr) Aimant permanent
DE69229352D1 (de) Magnetverschluss
IL108953A0 (en) Super conductive magnet for magnetic resonance systems
TW357287B (en) Two-phase electromechanical transducer and electromechanical device including at least one such transducer
FR2696058B1 (fr) Transducteur électromagnétique polyphasé à aimant permanent multipolaire.
GB2241830B (en) Superconductive magnet coil arrangement
DE69113732D1 (de) Magnetkreis mit Permanentmagnet.
AU3149293A (en) Method for determination of optimum fields of permanent magnet structures with linear magnetic characteristics

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed