EP0203952A1 - Eisenkernloser elektromagnet. - Google Patents

Eisenkernloser elektromagnet.

Info

Publication number
EP0203952A1
EP0203952A1 EP85905842A EP85905842A EP0203952A1 EP 0203952 A1 EP0203952 A1 EP 0203952A1 EP 85905842 A EP85905842 A EP 85905842A EP 85905842 A EP85905842 A EP 85905842A EP 0203952 A1 EP0203952 A1 EP 0203952A1
Authority
EP
European Patent Office
Prior art keywords
magnet
rods
coil
discs
magnet according
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
EP85905842A
Other languages
English (en)
French (fr)
Other versions
EP0203952B1 (de
Inventor
Guy Aubert
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.)
General Electric CGR SA
Original Assignee
Thomson CGR
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 Thomson CGR filed Critical Thomson CGR
Publication of EP0203952A1 publication Critical patent/EP0203952A1/de
Application granted granted Critical
Publication of EP0203952B1 publication Critical patent/EP0203952B1/de
Expired 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
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/20—Electromagnets; Actuators including electromagnets without armatures
    • H01F7/202—Electromagnets for high magnetic field strength

Definitions

  • FIG. 2 is a detail view of two adjacent turns illustrating one of the modifications of the Bitter coil
  • the coil of Bitter 111 therefore has a central hole 112, conductive discs 113 and insulating discs 115.
  • the discs 113 and 115 have the same configuration of holes 120 and the stack of discs 113 and 115 is tight by tie rods
  • the magnet comprises one or more conductors ensuring the return of the current to one of the axial ends of the magnet, shaped (s) and / or arranged (s) to distribute the flow of said current longitudinally on a cylindrical surface coaxial with the coil or coils constituting the magnet.
  • the configuration which, in theory, best meets this definition is a cylindrical tubular envelope 0, external to the coil, coaxial with the latter and connected by one of its axial ends to one of the end plates, for example the tray 118b. It is shown that the flow of current in this tubular envelope does not create a disturbing magnetic field in the central hole 112.
  • the tie rods are connected to the end plate 118b if the coil 111 is single or to the corresponding plate of the coil closest to the axial end of the magnet to which no cable power supply is not connected. In this case, the plate 118b ensures the
  • each pair the conductive wires are arranged parallel to one another so as not to produce a stray field and in the example described, each pair of conductive wires in question forms a cable 126 with a coaxial structure.
  • any disturbing magnetic field (which could have been created by a "loop" including the magnet and its connection wires if these had been respectively connected to the axial ends of the magnet) is eliminated in the vicinity of the magnet.
  • the fact of using the tie rods (or the tubular casing) to bring the current towards an axial end of the magnet has the additional advantage of compensating for the axial component of the current which circulates in the Bitter coil, due to the pitch d winding propeller. This component is weak and does not create any field along the axis zz '. It modifies little the module of the field but only its orientation. The compensation of this longitudinal component of current by the currents which circulate in the tie rods thus brings back the orientation of the magnetic field along the axis zz '.
  • connection structure illustrated in Figure 3 can be used for the passage of current between the coils if the magnet has more than one.
  • all the end plates of the coils are similar to the plate il 8a and two neighboring coils are connected by as many coaxial cables as there , there are tie rods.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
EP85905842A 1984-12-14 1985-11-29 Eisenkernloser elektromagnet Expired EP0203952B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419193A FR2574982B1 (fr) 1984-12-14 1984-12-14 Aimant solenoidal sans fer
FR8419193 1984-12-14

Publications (2)

Publication Number Publication Date
EP0203952A1 true EP0203952A1 (de) 1986-12-10
EP0203952B1 EP0203952B1 (de) 1989-11-02

Family

ID=9310627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905842A Expired EP0203952B1 (de) 1984-12-14 1985-11-29 Eisenkernloser elektromagnet

Country Status (5)

Country Link
US (1) US4808956A (de)
EP (1) EP0203952B1 (de)
DE (1) DE3574073D1 (de)
FR (1) FR2574982B1 (de)
WO (1) WO1986003881A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618016A1 (fr) * 1987-07-10 1989-01-13 Thomson Cgr Dispositif de refroidissement d'un aimant resistif
FR2621731B1 (fr) * 1987-10-09 1990-02-09 Thomson Cgr Bobine, aimant comprenant une telle bobine, dispositif d'imagerie par rmn comportant un tel aimant et procede de realisation d'un tel aimant
JPH0245902A (ja) * 1988-08-08 1990-02-15 Kanazawa Univ 交流強磁場用成層渦電流型コイル
US4965521A (en) * 1989-08-11 1990-10-23 Spectroscopy Imaging Systems Method and apparatus for compensating eddy current effects in a magnetic resonance device having pulsed magnetic field gradients
US6876288B2 (en) * 2002-03-29 2005-04-05 Andrey V. Gavrilin Transverse field bitter-type magnet
DE102009016042B4 (de) * 2009-04-02 2011-02-10 Randolf Hoche Voice-Coil-Actuator und Verfahren zum Herstellen desselben
ITRM20130711A1 (it) * 2013-12-20 2015-06-21 Imaging Technology Abruzzo S R L Apparato e metodo di imaging simultaneo tramite risonanza di spin elettronico e risonanza di spin nucleare
CN113539638A (zh) * 2021-07-06 2021-10-22 辽宁意思德电气有限公司 一种大容量电感

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281737A (en) * 1963-09-26 1966-10-25 Gen Electric Superconductive solenoid
DE3133432A1 (de) * 1981-08-24 1983-03-03 Siemens AG, 1000 Berlin und 8000 München Hochfrequenzfeld-einrichtung in einer kernspinresonanz-apparatur
WO1983002522A1 (en) * 1982-01-15 1983-07-21 Fdx Associates L P Composite coils for toroidal field coils and method of using same
US4517516A (en) * 1983-04-08 1985-05-14 Varian Associates, Inc. NMR Probe coil form structure
US4694255A (en) * 1983-11-04 1987-09-15 General Electric Company Radio frequency field coil for NMR
GB8334374D0 (en) * 1983-12-23 1984-02-01 Picker Int Ltd Coil arrangements
GB8405066D0 (en) * 1984-02-27 1984-04-04 Picker Int Ltd Coil arrangements
US4500860A (en) * 1984-07-05 1985-02-19 General Electric Company Winding support and method for NMR magnet axisymmetric correction coils
FR2567647B1 (fr) * 1984-07-10 1987-12-18 Thomson Cgr Dispositif de creation et/ou de reception d'un champ magnetique alternatif pour appareil exploitant la resonance magnetique nucleaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8603881A1 *

Also Published As

Publication number Publication date
WO1986003881A1 (fr) 1986-07-03
FR2574982B1 (fr) 1987-01-16
US4808956A (en) 1989-02-28
DE3574073D1 (de) 1989-12-07
FR2574982A1 (fr) 1986-06-20
EP0203952B1 (de) 1989-11-02

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