WO2002029431A3 - Ensemble aimants permanents - Google Patents

Ensemble aimants permanents Download PDF

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Publication number
WO2002029431A3
WO2002029431A3 PCT/GB2001/003297 GB0103297W WO0229431A3 WO 2002029431 A3 WO2002029431 A3 WO 2002029431A3 GB 0103297 W GB0103297 W GB 0103297W WO 0229431 A3 WO0229431 A3 WO 0229431A3
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnets
plates
magnet assembly
permanent magnet
air gap
Prior art date
Application number
PCT/GB2001/003297
Other languages
English (en)
Other versions
WO2002029431A2 (fr
Inventor
Neil Marks
Original Assignee
Council Cent Lab Res Councils
Neil Marks
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 Council Cent Lab Res Councils, Neil Marks filed Critical Council Cent Lab Res Councils
Priority to AU2001270911A priority Critical patent/AU2001270911A1/en
Publication of WO2002029431A2 publication Critical patent/WO2002029431A2/fr
Publication of WO2002029431A3 publication Critical patent/WO2002029431A3/fr

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

L'invention concerne un ensemble aimants permanents s'utilisant par exemple dans un dispositif d'imagerie par résonance magnétique, qui comporte deux aimants (1,2) permanents espacés s'étendant entre deux plaques (3,4) constituées d'une matière à perméabilité élevée. Les aimants permanents et les plaques définissent une structure s'étendant autour d'un entrefer (5) dans lequel un flux magnétique homogène doit être produit. Les aimants (1,2) permanents définissent des surfaces d'extrémité qui appuient contre des surfaces correspondantes des plaques, et les pôles des aimants permanents de même polarité se situent face à la même plaque. Les surfaces d'extrémité des aimants permanents ne sont pas planes, et sont façonnées de sorte que les longueurs des surfaces (10,11) latérales intérieures des aimants permanents, qui forment les côtés de l'entrefer (5), sont inférieures à celles des surfaces (12,13) latérales extérieures.
PCT/GB2001/003297 2000-10-06 2001-07-23 Ensemble aimants permanents WO2002029431A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001270911A AU2001270911A1 (en) 2000-10-06 2001-07-23 Permanent magnet assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0024495.4 2000-10-06
GB0024495A GB0024495D0 (en) 2000-10-06 2000-10-06 Permanent magnet assembly

Publications (2)

Publication Number Publication Date
WO2002029431A2 WO2002029431A2 (fr) 2002-04-11
WO2002029431A3 true WO2002029431A3 (fr) 2002-05-10

Family

ID=9900783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/003297 WO2002029431A2 (fr) 2000-10-06 2001-07-23 Ensemble aimants permanents

Country Status (3)

Country Link
AU (1) AU2001270911A1 (fr)
GB (1) GB0024495D0 (fr)
WO (1) WO2002029431A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706057A (en) * 1985-05-23 1987-11-10 Siemens Aktiengesellschaft Magnet of a nuclear spin tomograph
WO1994020971A1 (fr) * 1993-03-09 1994-09-15 Commissariat A L'energie Atomique Structure d'aimant permanent a haute efficacite et a faibles fuites

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706057A (en) * 1985-05-23 1987-11-10 Siemens Aktiengesellschaft Magnet of a nuclear spin tomograph
WO1994020971A1 (fr) * 1993-03-09 1994-09-15 Commissariat A L'energie Atomique Structure d'aimant permanent a haute efficacite et a faibles fuites

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JONES R.E. ET AL.: "Directionally Homogenous Magnets for Vacuum Deposition Apparatus. October 1976.", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 19, no. 5, 1 October 1976 (1976-10-01), New York, US, pages 1856 - 1857, XP002179705 *

Also Published As

Publication number Publication date
AU2001270911A1 (en) 2002-04-15
WO2002029431A2 (fr) 2002-04-11
GB0024495D0 (en) 2000-11-22

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