GB863272A - Improvements relating to magnet assemblies - Google Patents
Improvements relating to magnet assembliesInfo
- Publication number
- GB863272A GB863272A GB32652/57A GB3265257A GB863272A GB 863272 A GB863272 A GB 863272A GB 32652/57 A GB32652/57 A GB 32652/57A GB 3265257 A GB3265257 A GB 3265257A GB 863272 A GB863272 A GB 863272A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polepiece
- yoke
- faces
- polepieces
- electromagnets
- 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.)
- Expired
Links
Classifications
-
- 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
-
- 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
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)
- Surgical Instruments (AREA)
Abstract
863,272. Magnets; electromagnets; magnetizing apparatus. FAIREY CO. Ltd. Oct. 14, 1958 [Oct. 18, 1957; Feb. 13, 1958], Nos. 32652/57 and 4775/58. Class 35. [Also in Group XXXVI] To ensure that the pole faces of a magnet assembly, e.g. in a nuclear magnetic resonance detector (see Group XXXVI), are accurately parallel, one of them is freely movable relative to the other and they are spaced apart by non- magnetic slip-gauges. The assembly comprises two sets of stacked rings 15, permanently magnetized in situ by coils 18, and connected by yokes 11, 12 to the polepieces, one of which, 20, is fixed while the other, 30, is a sliding fit in yoke 11. The polepiece 30 has a movable portion 32 connected to the remainder at a spherical seating 33, whose centre of curvature is near the middle of the air gap. The polepieces have lapped faces, either flat or curved; in the latter case the arcs are concentric, one convex, the other concave. The faces are spaced apart by one or more identical non-magnetic slips 40 of glass, quartz or bronze. If one slip only is used it is of horeseshoe shape, or annular with radial holes for the insertion of probes. Coils 48 on each polepiece enable the field strength to be varied. In alternative arrangements electromagnets may replace the permanent ones, and one polepiece may be connected to its yoke at a spherical surface while the other is slidable to set the gap length. According to the second Provisional Specification the movable polepiece is located in the yoke by two sets of balls in recesses in the yoke, each ball being adjusted radially with respect to the polepiece by a screw. In the first Provisional Specification flexibility of one polepiece is obtained by mounting it in a rubber or iron-loaded grease bush instead of employing the spherical seating arrangement previously described.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB32652/57A GB863272A (en) | 1957-10-18 | 1957-10-18 | Improvements relating to magnet assemblies |
| US767435A US3030556A (en) | 1957-10-18 | 1958-10-15 | Nuclear magnetic resonance detectors |
| FR776908A FR1220798A (en) | 1957-10-18 | 1958-10-17 | Improvements in nuclear magnetic resonance detectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB32652/57A GB863272A (en) | 1957-10-18 | 1957-10-18 | Improvements relating to magnet assemblies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB863272A true GB863272A (en) | 1961-03-22 |
Family
ID=10341966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32652/57A Expired GB863272A (en) | 1957-10-18 | 1957-10-18 | Improvements relating to magnet assemblies |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB863272A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1297246B (en) * | 1963-10-24 | 1969-06-12 | Newport Instr Scient And Mobil | Permanent or electromagnet with two axially aligned pole pieces |
| US4943774A (en) * | 1989-06-01 | 1990-07-24 | General Atomics | Magnetic field control apparatus |
| WO2008052616A1 (en) * | 2006-10-28 | 2008-05-08 | Smiths Heimann Gmbh | Betatron comprising a removable accelerator block |
| EP2449412A1 (en) * | 2009-06-30 | 2012-05-09 | Aspect Magnet Technologies Ltd. | A cage in an mrd with a fastening/attenuating system |
| US10224135B2 (en) | 2016-08-08 | 2019-03-05 | Aspect Imaging Ltd. | Device, system and method for obtaining a magnetic measurement with permanent magnets |
| US10750973B2 (en) | 2010-07-07 | 2020-08-25 | Aspect Imaging Ltd. | Devices and methods for a neonate incubator, capsule and cart |
| US10847294B2 (en) | 2017-07-10 | 2020-11-24 | Aspect Imaging Ltd. | System for generating a magnetic field |
| CN112967857A (en) * | 2020-04-17 | 2021-06-15 | 北京中科三环高技术股份有限公司 | Permanent magnet device |
| US11278461B2 (en) | 2010-07-07 | 2022-03-22 | Aspect Imaging Ltd. | Devices and methods for a neonate incubator, capsule and cart |
| US11287497B2 (en) | 2016-08-08 | 2022-03-29 | Aspect Imaging Ltd. | Device, system and method for obtaining a magnetic measurement with permanent magnets |
-
1957
- 1957-10-18 GB GB32652/57A patent/GB863272A/en not_active Expired
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1297246B (en) * | 1963-10-24 | 1969-06-12 | Newport Instr Scient And Mobil | Permanent or electromagnet with two axially aligned pole pieces |
| US4943774A (en) * | 1989-06-01 | 1990-07-24 | General Atomics | Magnetic field control apparatus |
| RU2479168C2 (en) * | 2006-10-28 | 2013-04-10 | Смитс Хайманн Гмбх | Betatron having removable accelerator block |
| WO2008052616A1 (en) * | 2006-10-28 | 2008-05-08 | Smiths Heimann Gmbh | Betatron comprising a removable accelerator block |
| CN101530002B (en) * | 2006-10-28 | 2011-08-03 | 史密斯海曼有限公司 | Betatron comprising a removable accelerator block |
| US7994740B2 (en) | 2006-10-28 | 2011-08-09 | Smiths Heimann Gmbh | Betatron with a removable accelerator block |
| US9448294B2 (en) * | 2009-06-30 | 2016-09-20 | Aspect Imaging Ltd. | Cage in an MRD with a fastening/attenuating system |
| US10996297B2 (en) | 2009-06-30 | 2021-05-04 | Aspect Imaging Ltd. | Method of assembling a magnetic resonance device |
| EP2449412A4 (en) * | 2009-06-30 | 2013-08-14 | Aspect Magnet Technologies Ltd | A cage in an mrd with a fastening/attenuating system |
| EP2453250A3 (en) * | 2009-06-30 | 2013-09-04 | Aspect Magnet Technologies Ltd. | A cage in an magnetic resonance device with a fastening/attenuating system |
| EP2449412A1 (en) * | 2009-06-30 | 2012-05-09 | Aspect Magnet Technologies Ltd. | A cage in an mrd with a fastening/attenuating system |
| US10094896B2 (en) | 2009-06-30 | 2018-10-09 | Aspect Imaging Ltd. | Method of fastening a cage with a fastening system in an MRD |
| US20120119742A1 (en) * | 2009-06-30 | 2012-05-17 | Aspect Magnet Technologies Ltd. | Cage in an mrd with a fastening/attenuating system |
| EP3605131A1 (en) * | 2009-06-30 | 2020-02-05 | Aspect Imaging Ltd. | Cage for generating a magnetic field in a magnetic resonance device |
| US11278461B2 (en) | 2010-07-07 | 2022-03-22 | Aspect Imaging Ltd. | Devices and methods for a neonate incubator, capsule and cart |
| US10750973B2 (en) | 2010-07-07 | 2020-08-25 | Aspect Imaging Ltd. | Devices and methods for a neonate incubator, capsule and cart |
| US10847295B2 (en) | 2016-08-08 | 2020-11-24 | Aspect Imaging Ltd. | Device, system and method for obtaining a magnetic measurement with permanent magnets |
| US10224135B2 (en) | 2016-08-08 | 2019-03-05 | Aspect Imaging Ltd. | Device, system and method for obtaining a magnetic measurement with permanent magnets |
| US11287497B2 (en) | 2016-08-08 | 2022-03-29 | Aspect Imaging Ltd. | Device, system and method for obtaining a magnetic measurement with permanent magnets |
| US10847294B2 (en) | 2017-07-10 | 2020-11-24 | Aspect Imaging Ltd. | System for generating a magnetic field |
| US11887778B2 (en) | 2017-07-10 | 2024-01-30 | Aspect Imaging Ltd. | System for generating a magnetic field |
| CN112967857A (en) * | 2020-04-17 | 2021-06-15 | 北京中科三环高技术股份有限公司 | Permanent magnet device |
| CN112967857B (en) * | 2020-04-17 | 2023-12-15 | 北京中科三环高技术股份有限公司 | Permanent magnet device |
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