JPH0320045B2 - - Google Patents
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- Publication number
- JPH0320045B2 JPH0320045B2 JP59263298A JP26329884A JPH0320045B2 JP H0320045 B2 JPH0320045 B2 JP H0320045B2 JP 59263298 A JP59263298 A JP 59263298A JP 26329884 A JP26329884 A JP 26329884A JP H0320045 B2 JPH0320045 B2 JP H0320045B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnets
- atomic
- permanent magnet
- magnet
- magnetic
- 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 - Lifetime
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- 229910052761 rare earth metal Inorganic materials 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical group [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910017052 cobalt Inorganic materials 0.000 description 7
- 239000010941 cobalt Substances 0.000 description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 7
- 150000002910 rare earth metals Chemical class 0.000 description 7
- 230000004907 flux Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000005347 demagnetization Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- 229910052772 Samarium Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003325 tomography Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910000722 Didymium Inorganic materials 0.000 description 1
- 241000224487 Didymium Species 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Description
【発明の詳細な説明】
利用産業分野
この発明は、Ｒ（ＲはＹを含む希土類元素のう
ち少なくとも１種）、Ｂ、Feを主成分とする焼結
永久磁石材料の着磁組立方法に係り、核磁気共鳴
断層撮影装置の磁気回路等、複数個の永久磁石を
一体に組立た磁石体から構成される大型磁気回路
に用いる高性能永久磁石の着磁組立方法に関す
る。[Detailed description of the invention] Industrial field of application The present invention relates to a method for magnetizing and assembling a sintered permanent magnet material whose main components are R (R is at least one rare earth element including Y), B, and Fe. The present invention relates to a method for magnetizing and assembling high-performance permanent magnets used in large magnetic circuits, such as magnetic circuits of nuclear magnetic resonance tomography apparatuses, which are composed of a magnet body made up of a plurality of permanent magnets assembled together.
背景技術
医学分野において、診断対象物の断層イメージ
を得る装置として、核磁気共鳴断層撮影装置（以
下NMR−CTという）が開発されており、ラン
ニングコストの低減や取り扱い等から、磁気回路
に永久磁石を用いたNMR−Clが望まれている
が、磁気回路の小形化並びに均一磁界を得るため
に、希土類コバルト形永久磁石などの最大エネル
ギー積（BH）maxの大きな永久磁石が要求され
ている。BACKGROUND ART In the medical field, nuclear magnetic resonance tomography (hereinafter referred to as NMR-CT) has been developed as a device for obtaining tomographic images of diagnostic objects.In order to reduce running costs and handling, permanent magnets are used in the magnetic circuit. However, in order to miniaturize the magnetic circuit and obtain a uniform magnetic field, a permanent magnet with a large maximum energy product (BH) max, such as a rare earth cobalt type permanent magnet, is required.
また、かかる磁気回路には磁力の強い永久磁石
が数トン単位で多量に使用されるため、永久磁石
の着磁方法には種々の問題を有している。例え
ば、多量の永久磁石を所要磁気回路及び形状に組
立たのち、着磁する所謂組立着磁方法は、かかる
高性能磁石を用いるNMR−CTには、工業的に
適用したが困難であり、一般に、各永久磁石を着
磁したのち磁石構成体に組立る所謂着磁組立方法
が採用されている。 Further, since such a magnetic circuit uses a large amount of permanent magnets with strong magnetic force in units of several tons, there are various problems in the method of magnetizing the permanent magnets. For example, the so-called assembly magnetization method, in which a large number of permanent magnets are assembled into a desired magnetic circuit and shape and then magnetized, is difficult to apply industrially to NMR-CT using such high-performance magnets, and is generally not used. , a so-called magnetization assembly method is employed in which each permanent magnet is magnetized and then assembled into a magnet structure.
例えば、複数個の希土類コバルト永久磁石を、
個々の永久磁石性に応じて適正配置して一体に組
立るには、まず個々の希土類コバルト永久磁石を
着磁し、サーチコイルの磁束計あるいはホールガ
ウスメータ等を用いて磁気特性（磁界強度）を測
定する必要があるが、一旦着磁した複数個の希土
類コバルト永久磁石を取り扱い保管するには、多
量の磁石同士の吸引、反発作用を考慮する必要が
あり、作業性、安全性上、種々の問題がある。 For example, multiple rare earth cobalt permanent magnets,
In order to properly arrange and assemble the individual permanent magnets according to their properties, first magnetize each rare earth cobalt permanent magnet, and then measure the magnetic properties (magnetic field strength) using a search coil magnetometer or Hall-Gauss meter. However, in order to handle and store multiple rare earth cobalt permanent magnets that have been magnetized, it is necessary to consider the mutual attraction and repulsion between a large number of magnets. There's a problem.
また、NMR−CT用磁気回路は、強い磁界を
得るだけでなく、該磁界が均一でかつ安定してい
ることが要求され、磁気回路を構成する個々の永
久磁石の有する磁気特性のばらつきが直接に磁界
の均一性を損ねる要員となるため、使用する永久
磁石個々の磁気特性を考慮した配置組立が望まれ
ている。 In addition, magnetic circuits for NMR-CT are required not only to obtain a strong magnetic field, but also to have this magnetic field be uniform and stable, and variations in the magnetic properties of individual permanent magnets that make up the magnetic circuit are directly affected. Since these elements impair the uniformity of the magnetic field, it is desirable to arrange and assemble the permanent magnets in consideration of their individual magnetic characteristics.
一方、本発明者は先に、高価なSmやCoを含有
しない新しい高性能永久磁石としてFe−Ｂ−Ｒ
系（ＲはＹを含む希土類元素のうち少なくとも１
種）永久磁石を提案した（特願昭57−145072号）。
さらにFe−Ｂ−Ｒ系の磁気異方性焼結体からな
る永久磁石の温度特性を改善するために、Feの
一部をCoで置換することにより、生成合金のキ
ユリー点を上昇させて温度特性を改善したFe−
Co−Ｂ−Ｒ系磁気異方性焼結体からなる永久磁
石を提案した（特願昭57−166663号）。これらの
永久磁石は、ＲとしてNdやPrを中心とする資源
的に豊富な軽希土類を用い、Feを主成分として
25MGOe以上の極めて高いエネルギー積を示す、
すぐれた永久磁石である。 On the other hand, the present inventor previously developed Fe-B-R as a new high-performance permanent magnet that does not contain expensive Sm or Co.
system (R is at least one rare earth element including Y
proposed a permanent magnet (Japanese Patent Application No. 145072-1982).
Furthermore, in order to improve the temperature characteristics of permanent magnets made of Fe-BR-based magnetically anisotropic sintered bodies, by replacing a portion of Fe with Co, the Curie point of the resulting alloy is raised and the temperature Fe− with improved properties
We proposed a permanent magnet made of a Co-BR-based magnetically anisotropic sintered body (Japanese Patent Application No. 166663/1983). These permanent magnets use resource-rich light rare earths, mainly Nd and Pr, as R, and Fe as the main component.
Showing an extremely high energy product of over 25MGOe,
It is an excellent permanent magnet.
上記Fe−Ｂ−Ｒ系永久磁石は、稀土類コバル
ト系永久磁石に比べて格段にすぐれた最大エネル
ギー積を有するため、NMR−CTの磁気回路用
に最適の永久磁石と考えられるが、磁石体を構成
する複数個の永久磁石の磁気特性に応じて適正配
置する目的で前記着磁組立方法を採用すること
は、前記の希土類コバルト系永久磁石の場合より
さらに困難であり、作業性や安全性の点で問題が
ある。 The above Fe-BR-based permanent magnets have a much superior maximum energy product compared to rare earth cobalt-based permanent magnets, so they are considered to be the most suitable permanent magnets for the magnetic circuit of NMR-CT. It is even more difficult to employ the above-mentioned magnetized assembly method for the purpose of appropriately arranging the plurality of permanent magnets that make up the magnet according to their magnetic properties than in the case of rare earth cobalt-based permanent magnets, and the workability and safety are affected. There is a problem with this.
発明の目的
この発明は、すぐれた時気特性を有しNMR−
CT磁気回路用として最適なFe−Ｂ−Ｒ系焼結永
久磁石を用い、複数個の永久磁石からなる磁石体
を組立るに際し、磁気回路の高度な均一磁界と安
全性を得るために個々の時期特性の応じた適正配
置が可能なFe−Ｂ−Ｒ系焼結永久磁石の着磁組
立方法を目的としている。Purpose of the Invention The present invention has excellent timing characteristics and is an NMR-
When assembling a magnet body consisting of multiple permanent magnets using Fe-B-R sintered permanent magnets, which are optimal for CT magnetic circuits, individual The purpose of this invention is to provide a method for magnetizing and assembling Fe-B-R based sintered permanent magnets that can be properly arranged according to the timing characteristics.
発明の構成と効果
この発明は、Fe−Ｂ−Ｒ系永久磁石の着磁組
立方法を目的に種々検討した結果、着磁後に所定
温度範囲で脱磁すると、組織変化が全くなく、再
着磁時の磁気特性の再現性にすぐれていることを
知見し、事前に着磁して測定した磁気特性に基づ
いて複数個の永久磁石を再現磁しその磁気特性に
応じて適正配置できる着磁組立方法を知見したも
のである。Structure and Effects of the Invention As a result of various studies aimed at the method of magnetizing and assembling Fe-B-R permanent magnets, the present invention found that when demagnetized in a predetermined temperature range after magnetization, there is no change in structure, and when re-magnetized. We found that the reproducibility of magnetic properties is excellent at the time of use, and based on the magnetic properties that have been magnetized and measured in advance, we have created a magnetization assembly that can reproduce multiple permanent magnets and arrange them appropriately according to their magnetic properties. This is what I learned about the method.
すなわち、この発明は、Ｒ（但しＲはＹを含む
希土類元素のうち少なくとも１種）８原子％〜30
原子％、B2原子％〜28原子％、Fe42原子％〜90
原子％を主成分とし主相が正方晶からなる複数個
の永久磁石を、一体に組立た磁石体の着磁組立方
法において、磁石体の各部位における所要磁気特
性を満足する永久磁石を適正配置するため、各永
久磁石を着磁して各々磁気特性を測定し、その
後、各永久磁石をそのキユリー温度以上でかつ
550℃以下の温度範囲にて加熱脱磁し、組立に際
して各永久磁石を上記の磁気特性測定値に応じて
再着磁して磁石体に組立ることを特徴とする永久
磁石の着磁組立方法である。 That is, the present invention provides R (where R is at least one kind of rare earth elements including Y) from 8 atomic % to 30
atomic%, B2 atomic% ~ 28 atomic%, Fe42 atomic% ~ 90
In a method of magnetizing and assembling a magnet body in which a plurality of permanent magnets whose main component is atomic percent and whose main phase is tetragonal are assembled, the permanent magnets are properly arranged to satisfy the required magnetic properties in each part of the magnet body. In order to
A method for magnetizing and assembling permanent magnets, which is characterized by heating and demagnetizing in a temperature range of 550°C or less, re-magnetizing each permanent magnet according to the above-mentioned magnetic property measurement values during assembly, and assembling it into a magnet body. It is.
この発明における永久磁石の限定理由は後述す
るとおりである。 The reasons for limiting the permanent magnet in this invention are as described below.
また、この発明において、脱磁処理温度をその
キユリー温度〜550℃としたのは、磁石材料のキ
ユリー温度未満では必要な脱磁ができず、550℃
を越えると、組織変化が発生する恐れがあり、再
着磁時の磁気特性の再現性が劣化するためであ
る。 In addition, in this invention, the demagnetization treatment temperature is set to 550℃ from the Curie temperature of the magnet material because the necessary demagnetization cannot be performed below the Curie temperature of the magnet material.
This is because if it exceeds this, there is a risk of structural changes occurring and the reproducibility of magnetic properties upon re-magnetization will deteriorate.
上記Fe−Ｂ−Ｒ系永久磁石のキユリー温度は、
300℃前後で、最高370℃程度であるが、Feの
一部を20原子％程度のCoで置換すると、キユリ
ー温度は500℃程度となる。 The Curie temperature of the Fe-BR permanent magnet mentioned above is around 300℃, with a maximum of about 370℃, but if part of the Fe is replaced with about 20 atomic percent Co, the Curie temperature becomes about 500℃. .
本系永久磁石はいずれの組成においても、650
℃〜700℃程度で組織変化が起るが、キユリー温
度〜550℃の温度範囲で加熱脱磁することにより、
組織変化を全く発生させることなく、脱磁でき、
再度着磁しても脱磁前と同様の磁気特性を発現さ
せることができる。 This permanent magnet has a 650
Tissue changes occur at temperatures between ℃ and 700℃, but by heating and demagnetizing in the temperature range from the Curie temperature to 550℃,
Can be demagnetized without causing any tissue changes,
Even when magnetized again, the same magnetic properties as before demagnetization can be exhibited.
ちなみに、高い保磁力を有する従来の希土類コ
バルト系永久磁石は、脱磁が困難であり、キユリ
ー温度（750℃程度）以上の加熱脱磁により脱磁
ができるが、組織変化が発生し、再度着磁しても
脱磁前の磁気特性を得ることができない。 By the way, it is difficult to demagnetize conventional rare-earth cobalt-based permanent magnets, which have a high coercive force, and can be demagnetized by heating at or above the Curie temperature (approximately 750°C), but this causes structural changes and makes it difficult to re-attach. Even if magnetized, the magnetic properties before demagnetization cannot be obtained.
従つて、この発明は、複数個の永久磁石からな
る磁石体を組立るに際し、磁気回路の高度な均一
磁界と安定性を得るために個々の磁気特性に応じ
た適正配置を可能とするために、事前に着磁して
測定した磁気特性に基づいて、組立時に再着磁し
て組立を行なうことができ、磁石の保管に至便で
あり、作業性並びに安全性にすぐれた着磁組立方
法である。 Therefore, when assembling a magnet body consisting of a plurality of permanent magnets, the present invention aims to enable proper arrangement according to the magnetic characteristics of each individual magnet in order to obtain a highly uniform magnetic field and stability of the magnetic circuit. , it is possible to re-magnetize and assemble at the time of assembly based on the magnetic properties measured by magnetizing in advance, making it convenient to store magnets, and using a magnetized assembly method with excellent workability and safety. be.
永久磁石の限定理由
この発明の永久磁石材料に用いる希土類元素Ｒ
は、８原子％〜30原子％のＹを含む希土類元素の
うち少なくとも１種であればよく、Nd、Pr、
Dy、Tdのうち少なくとも１種、あるいはさらに
La、Ce、Sm、Gd、Er、Eu、Pm、Tm、Yb、
Ｙのうち少なくとも１種を含むものが好ましい。Reason for limitation of permanent magnet Rare earth element R used in permanent magnet material of this invention
may be at least one of the rare earth elements containing 8 at% to 30 at% Y, such as Nd, Pr,
At least one of Dy, Td, or more
La, Ce, Sm, Gd, Er, Eu, Pm, Tm, Yb,
Those containing at least one type of Y are preferred.
又、通例Ｒのうち１種をもつて足りるが、実用
上は２種以上の混合物（ミツシユメタル、ジジム
等）を入手上の便宜等の理由により用いることが
できる。 Further, although it is usually sufficient to use one type of R, in practice, a mixture of two or more types (Mitsushimetal, didymium, etc.) can be used for reasons such as convenience of availability.
なお、このＲは純希土類元素でなくてもよく、
工業上入手可能な範囲で製造上不可避な不純物を
含有するものでも差支えない。 Note that this R may not be a pure rare earth element,
It may contain impurities that are unavoidable during production within an industrially available range.
Ｒ（Ｙを含む希土類元素のうち少なくとも１種）
は、新規な上記系永久磁石を製造する合金におけ
る、必須元素であつて、８原子％未満では、結晶
構造がα−鉄の同一構造の立方晶組織となるた
め、後磁気特性、特に高保磁力が得られず、30原
子％を越えると、Ｒリツチな非磁性相が多くな
り、残留磁束密度Brが低下して、すぐれた特性
の永久磁石が得られない。よつて、稀土類元素
は、８原子％〜30原子％の範囲とする。 R (at least one rare earth element including Y)
is an essential element in the alloy used to manufacture the new above-mentioned permanent magnets, and if it is less than 8 atomic %, the crystal structure becomes a cubic crystal structure with the same structure as α-iron, so the post-magnetic properties, especially high coercive force cannot be obtained, and if it exceeds 30 at %, the R-rich nonmagnetic phase increases, the residual magnetic flux density Br decreases, and a permanent magnet with excellent characteristics cannot be obtained. Therefore, the rare earth elements are in the range of 8 at.% to 30 at.%.
Ｂは、新規な上記系永久磁石における、必須元
素であつて、２原子％未満では、菱面体組織とな
り、高い保持力iHcは得られず、28原子％を越え
ると、Ｂリツチな非磁性相が多くなり、残留磁束
密度Brが低下するため、すぐれた永久磁石が得
られない。よつて、Ｂは、２原子％〜28原子％の
範囲とする。 B is an essential element in the new above-mentioned permanent magnet. If it is less than 2 atomic %, it will form a rhombohedral structure and a high coercive force iHc will not be obtained, and if it exceeds 28 atomic %, a B-rich nonmagnetic phase will occur. increases, and the residual magnetic flux density Br decreases, making it impossible to obtain an excellent permanent magnet. Therefore, B is in the range of 2 atomic % to 28 atomic %.
Feは、新規な上記系永久磁石において、必須
元素であり、42原子％未満では残留磁束密度Br
が低下し、80原子％を越えると、高い保磁力が得
られないので、Feは42原子％〜90原子％の含有
とする。 Fe is an essential element in the new above-mentioned permanent magnet, and if it is less than 42 at%, the residual magnetic flux density Br
If Fe decreases and exceeds 80 at%, high coercive force cannot be obtained, so the content of Fe is set to be 42 at% to 90 at%.
また、この発明による永久磁石用合金におい
て、Feの一部をCoで置換することにより、得ら
れる磁石の磁気特性を損うことなく、温度特性を
改善することができる。 Furthermore, in the alloy for permanent magnets according to the present invention, by replacing a portion of Fe with Co, the temperature characteristics can be improved without impairing the magnetic characteristics of the resulting magnet.
この発明の永久磁石において、高い残留磁束密
度と高保磁力を得るためには、R12.5原子％〜15
原子％、B6原子％〜14原子％、Fe71原子％〜82
原子％が好ましい。 In the permanent magnet of this invention, in order to obtain high residual magnetic flux density and high coercive force, R12.5 atomic% to 15
atomic%, B6 atomic% ~ 14 atomic%, Fe71 atomic% ~ 82
Atomic % is preferred.
この発明における永久磁石の結晶相は主相が少
なくとも50vol％以上の正方晶、少なとも1vol％
以上の非磁性金属間化合物であることが、すぐれ
た磁気特性を有する焼結永久磁石を作製するのに
不可欠である。 The crystalline phase of the permanent magnet in this invention is tetragonal with a main phase of at least 50 vol% or more, and at least 1 vol%
The above nonmagnetic intermetallic compound is essential for producing a sintered permanent magnet having excellent magnetic properties.
この発明の磁気異方性永久磁石材料は、残留磁
束密度Br＞10.5KG、を示し、最大エネルギー積
（BH）max≧25MGoeを示し、最大値は40MGoe
以上に達する。 The magnetically anisotropic permanent magnet material of the present invention exhibits a residual magnetic flux density Br>10.5KG, and a maximum energy product (BH) max≧25MGo e , with a maximum value of 40MGo e
reach more than that.
Claims (1)
くとも１種）８原子％〜30原子％、B2原子％〜
28原子％、Fe42原子％〜90原子％を主成分とし
主相が正方晶からなる複数個の永久磁石を、一体
に組立た磁石体の着磁組立方法において、磁石体
の各部位における所要磁気特性を満足する永久磁
石を適正配置するため、各永久磁石を着磁して
各々磁気特性を測定し、その後、各永久磁石をそ
のキユリー温度以上でかつ550℃以下の温度範囲
にて加熱脱磁し、組立に際して各永久磁石を上記
の磁気特性測定値に応じて再着磁して磁石体に組
立ることを特徴とする永久磁石の着磁組立方法。1 R (where R is at least one rare earth element including Y) 8 atomic% to 30 atomic%, B2 atomic% to
In a method for magnetizing and assembling a magnet body in which a plurality of permanent magnets whose main components are 28 at% Fe, Fe42 at% to 90 at% and the main phase is tetragonal are assembled together, the required magnetism in each part of the magnet body is determined. In order to properly arrange the permanent magnets that satisfy the characteristics, each permanent magnet is magnetized and its magnetic characteristics are measured, and then each permanent magnet is heated and demagnetized in a temperature range above its Curie temperature and below 550℃. A method for magnetizing and assembling permanent magnets, which comprises re-magnetizing each permanent magnet in accordance with the above-mentioned magnetic property measurement values and assembling the permanent magnet into a magnet body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59263298A JPS61140106A (en) | 1984-12-13 | 1984-12-13 | Method for magnetizing and assembling permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59263298A JPS61140106A (en) | 1984-12-13 | 1984-12-13 | Method for magnetizing and assembling permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61140106A JPS61140106A (en) | 1986-06-27 |
| JPH0320045B2 true JPH0320045B2 (en) | 1991-03-18 |
Family
ID=17387527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59263298A Granted JPS61140106A (en) | 1984-12-13 | 1984-12-13 | Method for magnetizing and assembling permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61140106A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0277416A3 (en) * | 1987-02-04 | 1990-05-16 | Crucible Materials Corporation | Permanent magnet alloy for elevated temperature applications |
| EP1069575B1 (en) | 1999-07-15 | 2008-05-14 | Neomax Co., Ltd. | Dismantling method for magnetic field generator |
| CN101089649B (en) | 2002-02-15 | 2010-06-02 | 日立金属株式会社 | Magnetic field generating apparatus manufacturing method |
| US7794142B2 (en) * | 2006-05-09 | 2010-09-14 | Tsi Technologies Llc | Magnetic element temperature sensors |
-
1984
- 1984-12-13 JP JP59263298A patent/JPS61140106A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61140106A (en) | 1986-06-27 |
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