JPH02154402A - Magnet assembly - Google Patents
Magnet assemblyInfo
- Publication number
- JPH02154402A JPH02154402A JP30844988A JP30844988A JPH02154402A JP H02154402 A JPH02154402 A JP H02154402A JP 30844988 A JP30844988 A JP 30844988A JP 30844988 A JP30844988 A JP 30844988A JP H02154402 A JPH02154402 A JP H02154402A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- magnet assembly
- thermal expansion
- support
- expansion coefficient
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 13
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 3
- 239000000057 synthetic resin Substances 0.000 claims abstract description 3
- 229910052723 transition metal Inorganic materials 0.000 claims description 13
- 150000003624 transition metals Chemical class 0.000 claims description 13
- 229910052796 boron Inorganic materials 0.000 claims description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 6
- 150000002910 rare earth metals Chemical class 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims 1
- 230000008646 thermal stress Effects 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 2
- 238000006731 degradation reaction Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 1
- 238000005336 cracking Methods 0.000 description 7
- 230000008602 contraction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000001351 cycling effect Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- FRWDHMWMHYXNLW-UHFFFAOYSA-N boron(3+) Chemical compound [B+3] FRWDHMWMHYXNLW-UHFFFAOYSA-N 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、希土類、遷移金属，ほう素から実質的になる
磁石（Ｒ−ＴＭ−Ｂ系永久磁石）組立体の改良に関し、
特に磁石と支持体との間に磁石の熱膨張係数と相反する
熱膨張係数を有する緩衝材料を配設してヒートサイクル
中の割れを防１１−シたものに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a magnet (R-TM-B permanent magnet) assembly consisting essentially of rare earths, transition metals, and boron.
In particular, the present invention relates to a structure in which a buffer material having a thermal expansion coefficient opposite to that of the magnet is disposed between the magnet and the support to prevent cracking during heat cycles.
［従来の技術］
希土類（Ｒ）、遷移金属（ＴＭ），ほう素（＋３）から
実質的になる永久磁石（以下Ｒ−ＴＭ−Ｂ系永久磁石と
呼ぶ。）は安価で且つ高磁気特性髪有するものとして注
目を集めている。Ｒ−ＴＭ−Ｂ系磁石は優れた磁気特性
に加えて、Ｒ−Ｃｏ系磁石と比べて機械的強度が大きい
という優れた性質を持っている。[Prior Art] Permanent magnets (hereinafter referred to as R-TM-B permanent magnets) consisting essentially of rare earth (R), transition metal (TM), and boron (+3) are inexpensive and have high magnetic properties. It is attracting attention as a property. In addition to excellent magnetic properties, R-TM-B magnets have superior properties such as greater mechanical strength than R-Co magnets.
即ち、Ｒ−Ｃｏ系磁石の曲げ強度１２０ ｋ ｇａｍｍ
′に対して２５０ ｋ、 ｇ／ｍ ｍ 、 Ｒ−Ｃｏ系
磁石の引っ張り強さ４５ ｋ ｇ／ｍｍ７′に対して８
０に、ｇ／ｍｍ２と倍近いものである。また、Ｒ−Ｃｏ
系磁石に対して脆くなく焼結の収縮に伴う内部応力にも
耐え得る。That is, the bending strength of the R-Co magnet is 120 k gamm.
250 k, g/mm for R-Co magnet, 8 for tensile strength of R-Co magnet 45 kg g/mm7'
0, g/mm2, which is almost double that. Also, R-Co
It is not brittle with respect to magnets and can withstand internal stress caused by shrinkage during sintering.
従って、従来Ｒ−Ｃｏ系では割れのために実際−１−不
可能視されていたラジアル異方性や多極異方性（ｇに極
異方性と呼ばれることもある。）などの磁石組立体の製
造か容易となり、ステンピングモータの高出力化、小型
化が実現できるようになった（特開昭６１−２８４９０
７号公報参照）。Therefore, magnet combinations such as radial anisotropy and multipolar anisotropy (sometimes referred to as polar anisotropy in g), which were considered impossible in the conventional R-Co system due to cracks. It became easier to manufacture three-dimensional parts, and it became possible to achieve higher output and smaller size stamping motors (Japanese Patent Application Laid-Open No. 61-28490).
(See Publication No. 7).
［発明が解決しようとする問題点コ
しかし、Ｒ−ＴＭ−Ｆ３系異方性磁石においては、異方
性方向とそれに直角方向では熱膨張係数に大きな差異が
あり、従来の物ではヒートサイクル中に割れを発生して
しまい製造歩留りを著しく低下したり、使用中の信頼性
を低下していた。即ち、リング状磁石と支持体の接着加
熱工程、或いはステラピンクモータ等に組み込まれた後
での温度変化によるリング状磁石のヒートサイクル中の
割れが問題となっていた。[Problems to be solved by the invention] However, in R-TM-F3 anisotropic magnets, there is a large difference in the coefficient of thermal expansion between the anisotropic direction and the direction perpendicular to it. This caused cracks to occur, significantly reducing manufacturing yield and reducing reliability during use. That is, there has been a problem of cracking of the ring-shaped magnet during a heat cycle due to a temperature change during the bonding and heating process between the ring-shaped magnet and the support, or after being incorporated into a Stellar Pink motor or the like.
事実、異方性方向の熱膨張係数と相反する熱膨張は約５
ｘ １０−’（１／’Ｃ）であるのに対して、異方性
方向に直角方向の熱膨張係数は約−２ｘ千〇−’（１／
℃）と大きく異なっている。ここで、Ｒ−ＴＭ−Ｂ系異
方性磁石において注目すべきは異方性方向とそれに直角
方向とでは熱膨張係数の符号が相反することである。In fact, the thermal expansion coefficient in the anisotropic direction and the opposite thermal expansion are approximately 5
x 10-'(1/'C), whereas the coefficient of thermal expansion in the direction perpendicular to the anisotropy direction is approximately -2 x 10-'(1/'C).
℃). Here, what should be noted in the R-TM-B anisotropic magnet is that the sign of the coefficient of thermal expansion is opposite in the anisotropic direction and in the direction perpendicular to the anisotropic direction.
更に、従来の磁石組立体では磁石と支持体との熱膨張係
数の著しい相違によっても磁石にビー１〜サイクル中の
割れが入り、磁気特性の急激な低下が生じたり、あるい
は信頼性の点で問題があった。Furthermore, in conventional magnet assemblies, due to the significant difference in thermal expansion coefficient between the magnet and the support, the magnet may crack during the bee cycle, resulting in a rapid deterioration of magnetic properties or reliability issues. There was a problem.
従って、本発明はＲ−ＴＭ−Ｂ系の磁石組立体に於いて
磁気特性が良好で磁石のピー１−サイクル中の割れがな
いものを提供することを目的とする。Accordingly, it is an object of the present invention to provide an R-TM-B magnet assembly that has good magnetic properties and is free from cracking during the P1-cycle of the magnet.
［問題点を解決するための手段］
本発明は、希土類（Ｒ）、遷移金属（ＴＭ），ほう素（
Ｂ）から実質的になるＲ−ＴＭ−Ｂ系の磁石と支持体と
からなる磁石組立体において、前記磁石と前記支持体と
の間に磁石の熱膨張係数と相反する熱膨張係数を持つ緩
衝材料を配設したことを特徴とする磁石組立体である。[Means for solving the problems] The present invention provides rare earth (R), transition metal (TM), boron (
B) In a magnet assembly consisting of an R-TM-B magnet and a support consisting essentially of B), a buffer having a thermal expansion coefficient opposite to that of the magnet is provided between the magnet and the support. This is a magnet assembly characterized by disposing a material.
本発明は、前記磁石の形状がリング状である場合に特に
顕著な効果があり、多極異方性、ラジアル異方性を有す
る磁石組立体に効果が大きい。The present invention is particularly effective when the magnet has a ring shape, and is particularly effective for magnet assemblies having multipolar anisotropy and radial anisotropy.
即ち、本発明は磁石の熱膨張係数とは相反する熱膨張係
数を有する材料を磁石と支持体の間に配設することによ
って、異方性方向とそれに直角方向の熱膨張係数の相違
、磁石と支持体の熱膨張係数の相違等による熱応力を緩
衝することによって、ヒートサイクル中の割れを防止す
るものである。That is, the present invention has the advantage that by disposing a material having a thermal expansion coefficient opposite to that of the magnet between the magnet and the support, the difference between the thermal expansion coefficient in the anisotropic direction and the direction perpendicular to the anisotropic direction, and the magnet This prevents cracking during heat cycles by buffering thermal stress caused by the difference in coefficient of thermal expansion between the support and the support.
本発明の作用は下記の通りである。即ち、熱膨張係数に
も異方性を有する磁石が接着剤を介して金属シャフト等
の支持体に接続されるときにヒートサイクルが加わると
磁石の膨張する部分は支持体に拘束されて圧縮応力が、
磁石の収縮部分は支持体に拘束されて引張応力が加わる
ためこれ等の熱応力によって磁石に割れが入る。そこで
、本発明者は磁石の熱膨張係数とは相反する熱膨張係数
を有する材料を配設することによって磁石の熱応力によ
る割れを防止できることを見出したものである。The effects of the present invention are as follows. In other words, when a magnet, which also has anisotropic thermal expansion coefficient, is connected to a support such as a metal shaft via an adhesive and a heat cycle is applied, the expanding portion of the magnet is restrained by the support and compressive stress occurs. but,
Since the contracted portion of the magnet is restrained by the support and tensile stress is applied thereto, the magnet cracks due to these thermal stresses. Therefore, the inventor of the present invention has discovered that it is possible to prevent the magnet from cracking due to thermal stress by disposing a material having a thermal expansion coefficient opposite to that of the magnet.
本発明において、磁石の熱膨張係数と相反する熱膨張係
数を有する材料としては、ある種の合成樹脂を選釈する
ことも出来るし、あるいは金属シャフトを零下の低温で
保持したものをリング状態の磁石の内径部に挿入した後
にこの磁石組立体を加熱すると締まりばめ効果をも発揮
して接着剤を不要とすることもでき、ヒートサイクル時
の磁石の熱膨張・収縮に対する拘束を避けることができ
る。第１図と第２図に、一実施例を示す。即ち、熱膨張
係数の小さい又は大きい材料（３）を使用し磁石（１）
を高温又は低温で組立し、使用温度範囲で接着剤を用い
ずにヨーク（２）に固定することができる。In the present invention, a certain type of synthetic resin may be selected as the material having a thermal expansion coefficient opposite to that of the magnet, or a metal shaft held at a low temperature below zero may be used in the form of a ring. Heating this magnet assembly after inserting it into the magnet's inner diameter also creates an interference fit effect, eliminating the need for adhesives and avoiding restraint from thermal expansion and contraction of the magnet during heat cycling. can. One embodiment is shown in FIGS. 1 and 2. That is, the magnet (1) is made of a material (3) with a small or large coefficient of thermal expansion.
can be assembled at high or low temperatures and fixed to the yoke (2) without using adhesive within the operating temperature range.
また、本発明の別の実施態様として、磁石体の磁路を形
成する磁性体及び／又は非磁性体のヨークにスリットを
入れヒー１へサイクル時の熱膨張・収縮を吸収すること
もできる。この場合、スリットを入れる位置は磁石の磁
極間の実質的に中間が磁気特性の乱れを発生せずに好ま
しい。第３図と第４図に一実施例を示す。即ち、磁石（
１）をヨク（２）に接着して固定する時にスリット（４
）を入れることによって、ヒー１へサイクル時の熱膨張
・収縮に起因する割れを防止できる。Further, as another embodiment of the present invention, a slit may be provided in the yoke of the magnetic material and/or non-magnetic material forming the magnetic path of the magnet body, so that thermal expansion and contraction during the cycle of the heater 1 can be absorbed. In this case, it is preferable that the slit be inserted substantially in the middle between the magnetic poles of the magnet so as not to cause any disturbance in the magnetic properties. One embodiment is shown in FIGS. 3 and 4. That is, a magnet (
When gluing and fixing 1) to the yoke (2), use the slit (4)
), it is possible to prevent cracks caused by thermal expansion and contraction during cycling into Heater 1.
あるいは、本発明において磁石組立体の支持体またはヨ
ークを磁石の極数に対応する多角体であって、磁極に対
応する箇所を多角体の辺部とし、磁極間に対応する箇所
を多角体の稜部とすることによって、磁気異方性方向で
の熱膨張を逃げ、磁気異方性方向と直角方向の熱収縮を
少なくすることもできる。Alternatively, in the present invention, the support or yoke of the magnet assembly is a polygon corresponding to the number of poles of the magnet, where the portions corresponding to the magnetic poles are the sides of the polygon, and the portions corresponding between the magnetic poles are the sides of the polygon. By forming the ridge, it is possible to escape thermal expansion in the magnetic anisotropy direction and reduce thermal contraction in a direction perpendicular to the magnetic anisotropy direction.
以下、実施例に依って本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to Examples.
［実施例］
（実施例１）
原子％でＮｄ ］５％、Ｂ １２％、残部Ｆｅなる合
金組成の溶湯を低周波溶解炉を用いてアルゴンガス雰囲
気下で溶解・鋳造した合金をスタンプミルとボールミル
で微粉砕し磁粉を得た。この磁粉を金型に充填し８極の
極異方性配向させた後、２トン／Ｃｌ１１の成形圧で圧
縮成形し外径３５ｍｍ、内径１６ｍｍ、高さ２０ｍｍの
焼形体を作製し、アルゴンガス雰囲気中で１１２０℃で
３時間焼結した。[Example] (Example 1) A molten metal having an alloy composition of 5% Nd, 12% B, and the balance Fe was melted and cast in a low frequency melting furnace under an argon gas atmosphere using a stamp mill. The powder was pulverized using a ball mill to obtain magnetic powder. This magnetic powder was filled into a mold and oriented in a polar anisotropic manner with 8 poles, and then compression molded at a molding pressure of 2 tons/Cl11 to produce a sintered body with an outer diameter of 35 mm, an inner diameter of 16 mm, and a height of 20 mm. Sintering was carried out at 1120° C. for 3 hours in an atmosphere.
その後、３４５Ｃ製の外径１５．８ｍｍ、内径６ｍｍの
円筒形ヨークであって、一部にスリン１−を磁極のほぼ
中間位置にいれたものを挿入した。次ｔ）で、この組立
体を１６０°Ｃ，０，５時間乾燥炉中で加熱した。Thereafter, a cylindrical yoke made of 345C and having an outer diameter of 15.8 mm and an inner diameter of 6 mm, in which Surin 1- was partially positioned approximately in the middle of the magnetic poles, was inserted. At step t), the assembly was heated in a drying oven at 160° C. for 0.5 hours.
比較例として、従来通りにスリットがなし１同一形状の
ヨークをエポキシ系の接着剤で接着したキ）のを作製し
た。As a comparative example, a yoke of the same shape (1) without slits was bonded with an epoxy adhesive in the conventional manner.
このようにして得られた磁石組立体を恒温槽の中に同時
に入れて８０℃の高温で１時間保持した後、−４０℃の
低温で１１時間保持するビー１〜サイクルを与えた。The magnet assemblies thus obtained were placed in a constant temperature bath at the same time and held at a high temperature of 80°C for 1 hour, and then subjected to a cycle of Bee 1 to held at a low temperature of -40°C for 11 hours.
第１表に、これら極異方性磁石の外観と磁気特性の試験
結果を示す。ここで、外観試験におし１て分母は試験片
の総数９分子はビー１−サイクル中の割が発生した試験
片の数を示す。この表から、本発明によるとヒートサイ
クル中の割がなく且つ磁気特性も優れた磁石組立体が得
られることがわかる。Table 1 shows the appearance and magnetic property test results of these polar anisotropic magnets. Here, in the appearance test, the denominator is the total number of test pieces (9), and the numerator is the number of test pieces in which breakage occurred during the Bee 1 cycle. From this table, it can be seen that according to the present invention, a magnet assembly that is not susceptible to heat cycling and has excellent magnetic properties can be obtained.
（実施例２）
実施例１におけるヨークに、磁極間のほぼ中間位置に一
部スリットを入れたものを作成し、実施例１と同様にし
てヒートサイクルを付与して試験したところ、第２表に
示す通りスリットの効果が更に相乗的に作用して割れが
更に減少することがわかる。(Example 2) A yoke in Example 1 with a partial slit approximately midway between the magnetic poles was created and tested by applying a heat cycle in the same manner as in Example 1. Table 2 shows the results. As shown in Figure 2, it can be seen that the effects of the slits act synergistically to further reduce cracking.
彰１図 ［発明の効果］ 以上述べたように、 本発明によれば、 温度変化 によるヒートサイクル中の割れがないＲＭ 系の磁石組立体が得られる。Akira 1 diagram [Effect of the invention] As mentioned above, According to the invention, temperature change RM without cracking during heat cycle due to A system magnet assembly is obtained.
第１〜４図は、 各々本発明の一実施例を示す図 である。 ７３）国 Figures 1 to 4 are Diagrams each showing an embodiment of the present invention It is. 73) Country
Claims (9)
から実質的になるＲ−ＴＭ−Ｂ系の磁石と支持体とから
なる磁石組立体において、前記磁石と前記支持体との間
に磁石の熱膨張係数と相反する熱膨張係数を持つ緩衝材
料を配設したことを特徴とする磁石組立体。(1) Rare earth (R), transition metal (TM), boron (B)
A magnet assembly comprising an R-TM-B magnet and a support consisting essentially of the following, wherein a buffer material having a thermal expansion coefficient opposite to that of the magnet is provided between the magnet and the support. A magnet assembly characterized in that:
の磁石組立体。(2) The magnet assembly according to claim 1, wherein the magnet has a ring shape.
磁石組立体。(3) The magnet assembly according to claim 2, wherein the magnet has multipolar anisotropy.
載の磁石組立体。(4) The magnet assembly according to claim 2, wherein the magnet has radial anisotropy.
１から４のいずれかの請求項に記載の磁石組立体。(5) The magnet assembly according to any one of claims 1 to 4, wherein the buffer material is a thermally expandable synthetic resin.
って、且つ支持体を兼ねる請求項１から４のいずれかの
請求項に記載の磁石組立体。(6) The magnet assembly according to any one of claims 1 to 4, wherein the buffer material is a metal material contracted at low temperature and also serves as a support.
から実質的になるＲ−ＴＭ−Ｂ系の磁石と支持体とから
なる磁石組立体において、磁石組立体の磁性及び／又は
非磁性のヨークの一部であって磁極の極間の実質的に中
間位置にスリットを設けたことを特徴とする磁石組立体
。(7) Rare earth (R), transition metal (TM), boron (B)
In a magnet assembly consisting of an R-TM-B magnet and a support consisting essentially of A magnet assembly characterized by having a slit at an intermediate position.
から実質的になるＲ−ＴＭ−Ｂ系の磁石と支持体とから
なる磁石組立体において、磁石組立体の支持体または磁
性及び／又は非磁性のヨークを磁石と相反する熱膨張係
数を有する材料を用いて実質的に接着剤を不要としたこ
とを特徴とする磁石組立体。(8) Rare earth (R), transition metal (TM), boron (B)
In a magnet assembly consisting of an R-TM-B magnet and a support, the support or magnetic and/or non-magnetic yoke of the magnet assembly is made of a material having a coefficient of thermal expansion opposite to that of the magnet. A magnet assembly characterized by substantially eliminating the need for adhesive.
から実質的になるＲ−ＴＭ−Ｂ系の磁石と支持体とから
なる磁石組立体において、磁石組立体の支持体または磁
性及び／又は非磁性のヨークを磁石の極数に対応する多
角体であって、磁極に対応する箇所を多角体の辺部とし
、磁極間に対応する箇所を多角体の稜部としたことを特
徴とする磁石組立体。(9) Rare earth (R), transition metal (TM), boron (B)
In a magnet assembly consisting of an R-TM-B magnet and a support, the support or magnetic and/or non-magnetic yoke of the magnet assembly is made of a polygon corresponding to the number of poles of the magnet. A magnet assembly characterized in that the portions corresponding to the magnetic poles are the sides of the polygon, and the portions corresponding between the magnetic poles are the edges of the polygon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30844988A JPH02154402A (en) | 1988-12-06 | 1988-12-06 | Magnet assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30844988A JPH02154402A (en) | 1988-12-06 | 1988-12-06 | Magnet assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02154402A true JPH02154402A (en) | 1990-06-13 |
Family
ID=17981158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30844988A Pending JPH02154402A (en) | 1988-12-06 | 1988-12-06 | Magnet assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02154402A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013531964A (en) * | 2010-07-06 | 2013-08-08 | フォンダツィオーネ・イスティトゥート・イタリアーノ・ディ・テクノロジャ | Device for generating power from a source of air or other gas or liquid under pressure |
-
1988
- 1988-12-06 JP JP30844988A patent/JPH02154402A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013531964A (en) * | 2010-07-06 | 2013-08-08 | フォンダツィオーネ・イスティトゥート・イタリアーノ・ディ・テクノロジャ | Device for generating power from a source of air or other gas or liquid under pressure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8839505B2 (en) | Method of manufacturing a magnet assembly | |
| US20190238016A1 (en) | Rotor for an electric machine, electric machine with the rotor and to method for producing the rotor | |
| EP0418304A1 (en) | Method of forming a permanent magnet rotor. | |
| JPH02154402A (en) | Magnet assembly | |
| JP2017157738A (en) | Manufacturing method of Mn-Al permanent magnet and Mn-Al permanent magnet | |
| JP2615844B2 (en) | Permanent magnet rotor | |
| US20050000083A1 (en) | Method of attaching a rotor to a shaft | |
| JP2011199116A (en) | Manufacturing method of bonded magnet | |
| JP2002329628A (en) | Method for manufacturing annular magnet structure and motor | |
| JPS59148302A (en) | Manufacturing method of cylindrical permanent magnet | |
| JPH0237703A (en) | Ring anisotropic magnet assembly | |
| JP2024007080A (en) | Rotor manufacturing method for rotating electric machines | |
| Strnat | A REVIEW OF RARE-EARTH PERMANENT MAGNETS, APPLICATIONS AND PROSPECTS | |
| JPS6437811A (en) | Voice coil type yoke frame and manufacture thereof | |
| JPS5854602A (en) | Manufacture of intermetallic compound magnet | |
| JPH01238109A (en) | Manufacture of composite magnetic substance | |
| JPS61284907A (en) | Radial anisotropic sintered magnet | |
| JPS62196802A (en) | Superconducting coil manufacturing method | |
| JPS5932527B2 (en) | Manufacturing method of anisotropic permanent magnet | |
| JPS60220908A (en) | Ferromagnetic resin composition | |
| JPH01310512A (en) | magnetic stand | |
| JPH0423403A (en) | Inclined oriented ring-shaped permanent magnet and its manufacturing method | |
| KR100237928B1 (en) | Metal tube for manufacturing a permanent magnet | |
| JPH01112716A (en) | Manufacture of ring magnet with special inside-diameter configuration | |
| JPH0434804B2 (en) |