JP4758629B2 - 極片のないマルチリング式永久磁石並びにその製作方法 - Google Patents
極片のないマルチリング式永久磁石並びにその製作方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title description 13
- 238000004519 manufacturing process Methods 0.000 title description 10
- 238000003384 imaging method Methods 0.000 claims description 71
- 239000000463 material Substances 0.000 claims description 50
- 239000000696 magnetic material Substances 0.000 claims description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 7
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 150000003624 transition metals Chemical class 0.000 claims description 4
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- 229910018125 Al-Si Inorganic materials 0.000 claims description 2
- 229910018520 Al—Si Inorganic materials 0.000 claims description 2
- 229910020516 Co—V Inorganic materials 0.000 claims description 2
- 229910017061 Fe Co Inorganic materials 0.000 claims description 2
- 229910017082 Fe-Si Inorganic materials 0.000 claims description 2
- 229910017133 Fe—Si Inorganic materials 0.000 claims description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 2
- 239000002243 precursor Substances 0.000 description 58
- 239000010410 layer Substances 0.000 description 48
- 238000002595 magnetic resonance imaging Methods 0.000 description 25
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- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- 150000002910 rare earth metals Chemical class 0.000 description 7
- 238000005481 NMR spectroscopy Methods 0.000 description 5
- 238000009189 magnetic resonance therapy Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical group [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical group [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 239000004830 Super Glue Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical group [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Chemical group 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Chemical group 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical group [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical group [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Chemical group 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Chemical group 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical group [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical group [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Chemical group 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical group [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Classifications
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- 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
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/128—Encapsulating, encasing or sealing
-
- 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
- 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
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
-
- 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
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
- H01F41/028—Radial anisotropy
-
- 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
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- 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)
Description
3 リング
5 リング
7 非磁性材料のリング
9 穴
11 磁石アセンブリ
13 軟磁性材料層
15 永久磁石本体
17 背側表面、第1の表面
18 リング高さ
19 撮像表面、第2の表面
21 ステップ、リング
22 永久磁石片
23 ステップ、リング
24 開口
25 ステップ、リング
26 永久磁石プラグ
27 ステップ、リング
28 アクチュエータ
29 金属裏当て
31 基礎セクション
33 ポケット
35 中空リング・セクション
41 基礎セクションの第1の主表面、背側表面
42 基礎セクションの第2の主表面
43 基礎セクションの縁部表面
48 リング・セクションの第1の主表面
49 リング・セクションの第2の主表面
50 リング・セクションの縁部表面
51 開口
52 接着剤層
54 永久磁石ブロック
60 MRIシステム
61 継鉄、支持体
62 底部プレート
63 上部プレート
65 撮像ボリューム
66 管状体
67 RFコイル
68 画像処理装置
69 患者
70 寝台、患者支持体
71 拘束具
73 ハウジング
75 前駆体
81 支持体
82 カバー
83 接着材料
84 エポキシ・パン
111 第2の磁石アセンブリ
113 軟磁性材料層
115 永久磁石本体
117 永久磁石の背側表面
119 撮像表面
Claims (7)
- イメージング装置(60)のための永久磁石アセンブリ(11)であって、
第1の表面(17)と、イメージング装置の撮像ボリューム(65)に対面するように適合させた階段状の第2の表面(19)とを有する永久磁石本体(15)を備えており、前記階段状の第2の表面は少なくとも4つのステップ(21、23、25、27)を含んでおり、
前記永久磁石本体(15)が、
前記少なくとも1層の軟磁性材料に取り付けられた第1の主表面(41)と、該第1の表面の反対側にあり、少なくとも3つのステップ(21、23、25)を有する第2の主表面(42)とを有する円筒状の基礎セクション(31)と、
前記基礎セクションの第2の主表面(42)の外側部分に取り付けられた中空のリング・セクション(35)とを備え、
前記基礎セクション(31)の第1及び第2の表面(41、42)と、前記中空リング・セクションの第1及び第2の表面(48、49)は、該磁石アセンブリの磁場の方向(20)と実質的に直交するように配列されていること、
前記基礎セクション(31)は少なくとも2層の永久磁石ブロック(54)を備えていること、
前記基礎セクションの第2の主表面にあるステップ(21、23、25)のうちの少なくとも2つが前記第2の表面(42)になるように機械加工されており、
前記基礎セクション(31)は少なくとも2層の永久磁石ブロック(54)を備え、
前記少なくとも1層の軟磁性材料は、前記永久磁石本体(15)の実質的に平坦な前記第1の主表面(41)に取り付けられ、
前記基礎セクション(31)の第1及び第2の表面(41、42)と、前記中空リング・セクションの第1及び第2の表面(48、49)は、該磁石アセンブリの磁場の方向(20)と実質的に直交するように配列され、
前記永久磁石本体の前記階段状の第2の撮像表面は、前記中空リング・セクションの前記第2の表面と、該リング・セクションによって覆われていない前記基礎セクションの前記第2の表面の一部分と、を備えており、
該中空リング・セクションの第2の主表面(49)は、1つのポケットを形成するように前記基礎セクションの第2の主表面(42)の隣接部分の上に少なくとも0.05メートルだけ延びている、
永久磁石アセンブリ(11)。 - 前記基礎セクション(31)の前記少なくとも3つのステップ(21、23、25)の高さは、0.03メートル未満である、請求項1に記載のアセンブリ。
- イメージング装置(60)のための永久磁石アセンブリ(11)であって、
第1の表面(17)と、イメージング装置の撮像ボリューム(65)に対面するように適合させた階段状の第2の表面(19)とを有する永久磁石本体(15)を備えており、
前記階段状の第2の表面の中央ステップ(21)は1つの突起部を形成しており、
前記永久磁石本体(15)が、
前記少なくとも1層の軟磁性材料に取り付けられた第1の主表面(41)と、該第1の表面の反対側にあり、少なくとも3つのステップ(21、23、25)を有する第2の主表面(42)とを有する円筒状の基礎セクション(31)と、
前記基礎セクションの第2の主表面(42)の外側部分に取り付けられた中空のリング・セクション(35)とを備え、
前記基礎セクション(31)の第1及び第2の表面(41、42)と、前記中空リング・セクションの第1及び第2の表面(48、49)は、該磁石アセンブリの磁場の方向(20)と実質的に直交するように配列されていること、
前記基礎セクション(31)は少なくとも2層の永久磁石ブロック(54)を備えていること、
前記基礎セクションの第2の主表面にあるステップ(21、23、25)のうちの少なくとも2つが前記第2の表面(42)になるように機械加工されており、
前記基礎セクション(31)は少なくとも2層の永久磁石ブロック(54)を備え、
前記少なくとも1層の軟磁性材料は、前記永久磁石本体(15)の実質的に平坦な前記第1の主表面(41)に取り付けられ、
前記基礎セクション(31)の第1及び第2の表面(41、42)と、前記中空リング・セクションの第1及び第2の表面(48、49)は、該磁石アセンブリの磁場の方向(20)と実質的に直交するように配列され、
前記永久磁石本体の前記階段状の第2の撮像表面は、前記中空リング・セクションの前記第2の表面と、該リング・セクションによって覆われていない前記基礎セクションの前記第2の表面の一部分と、を備えており、
該中空リング・セクションの第2の主表面(49)は、1つのポケットを形成するように前記基礎セクションの第2の主表面(42)の隣接部分の上に少なくとも0.05メートルだけ延びており、
前記基礎セクション(31)の前記少なくとも3つのステップ(21、23、25)の高さは、0.03メートル未満である、永久磁石アセンブリ(11)。 - 前記永久磁石本体(15)がRMB永久磁石材料を含んでおり、
ここで、Rは少なくとも1種の希土類元素を含み、かつMは少なくとも1種の遷移金属を含むことを特徴とする請求項1乃至3のいずれかに記載のアセンブリ。 - 前記RMB永久磁石材料が、13〜19原子百分率のR;4〜20原子百分率のホウ素;並びに残部Mを含み、
前記Rが、50%を超えるプラセオジム、0.1〜10原子百分率のCe、Y及びLaの少なくとも1種、及び残部のNdを含み、
前記Mが、鉄を含み、
前記少なくとも1層の軟磁性材料が、Fe−Si、Fe−Co、Fe−Ni、Fe−Al、Fe−Al−Si、Fe−Co−V、Fe−Cr−Ni、もしくは非晶質のFeベースまたはCoベースの合金の任意の1層または複数層を備える請求項4に記載のアセンブリ。 - 前記ポケットに配置された複数のシムをさらに含む、請求項1乃至5のいずれかに記載のアセンブリ。
- 前記階段状の第2の表面(19)は複数のリング(21、23、25、27)を備えること、
前記中央ステップ(21)は中実の中央リングを備えること、
外側のステップ(23、25、27)は複数の中空のリングを備えること、
前記中実の中央リング(21)は、該中実中央リングに隣接する第1の中空リング(23)の高さと比べてより大きいが、その他の複数の中空リング(25、27)高さと比べてより小さいような高さを有すること、
を特徴とする請求項3に記載のアセンブリ。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/672,658 | 2003-09-29 | ||
US10/672,658 US7423431B2 (en) | 2003-09-29 | 2003-09-29 | Multiple ring polefaceless permanent magnet and method of making |
Publications (3)
Publication Number | Publication Date |
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JP2005109487A JP2005109487A (ja) | 2005-04-21 |
JP2005109487A5 JP2005109487A5 (ja) | 2009-11-12 |
JP4758629B2 true JP4758629B2 (ja) | 2011-08-31 |
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JP (1) | JP4758629B2 (ja) |
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-
2003
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-
2004
- 2004-08-31 IT IT001679A patent/ITMI20041679A1/it unknown
- 2004-09-22 CN CNB2004100824436A patent/CN100444290C/zh not_active Expired - Fee Related
- 2004-09-28 JP JP2004280787A patent/JP4758629B2/ja not_active Expired - Fee Related
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CN1602805A (zh) | 2005-04-06 |
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US20050068138A1 (en) | 2005-03-31 |
CN100444290C (zh) | 2008-12-17 |
US7423431B2 (en) | 2008-09-09 |
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