JPS63213907A - Magnetization of permanent magnet - Google Patents
Magnetization of permanent magnetInfo
- Publication number
- JPS63213907A JPS63213907A JP4953287A JP4953287A JPS63213907A JP S63213907 A JPS63213907 A JP S63213907A JP 4953287 A JP4953287 A JP 4953287A JP 4953287 A JP4953287 A JP 4953287A JP S63213907 A JPS63213907 A JP S63213907A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- rare earth
- high frequency
- magnetizing
- becomes
- 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
Links
- 230000005415 magnetization Effects 0.000 title claims abstract description 27
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 21
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 20
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 8
- 150000003624 transition metals Chemical class 0.000 claims abstract description 8
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 14
- 229920006395 saturated elastomer Polymers 0.000 abstract 2
- 230000004907 flux Effects 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、希土類金属と遷移金属を主成分とする金属間
化合物からなる永久磁石の着磁方法に関する。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of magnetizing a permanent magnet made of an intermetallic compound containing rare earth metals and transition metals as main components.
「従来技術と問題点」
希土類金属と遷移金属とを主成分とする合金磁石（以下
、希土類磁石という）は、従来のフェライト系、アルニ
コ系磁石に比べて優れた磁気特性を存しいるため、近年
小型モーターを中心として多方面に利用されている。"Prior Art and Problems" Alloy magnets whose main components are rare earth metals and transition metals (hereinafter referred to as rare earth magnets) have superior magnetic properties compared to conventional ferrite and alnico magnets. In recent years, it has been used in a variety of fields, mainly in small motors.
これらの希±Ｍ＆１１石は、通常極めて高い保磁力（ｉ
ＨＣ）を有しいるため、飽和着磁をするためには相当大
なる着磁磁場が必要である。しかし乍ら、このように高
い着磁磁場を発生させるためには大容量の着磁電源を必
要とし、着磁ヨークの構・造も複雑となり、着磁装置そ
のものが高価なものになる。且つ、高い着磁磁場を発生
させるためには着磁ヨークに大電流を流す必要があり、
かかる大電流のために着磁ヨークが発熱してしまい、連
続着磁ができなくなる。These rare ±M&11 stones usually have extremely high coercivity (i
HC), a considerably large magnetizing magnetic field is required for saturation magnetization. However, in order to generate such a high magnetizing magnetic field, a large-capacity magnetizing power source is required, the structure of the magnetizing yoke becomes complicated, and the magnetizing device itself becomes expensive. In addition, in order to generate a high magnetizing magnetic field, it is necessary to flow a large current through the magnetizing yoke.
Such a large current causes the magnetizing yoke to generate heat, making continuous magnetization impossible.
「問題点を解決するための手段」
本発明は上記の従来技術の問題点に鑑み、希土類磁石に
関して、着磁作業の能率を低下させることなく、より低
い着磁磁場で飽和着磁が可能となる着磁方法を提供する
ことを目的とする。"Means for Solving the Problems" In view of the problems of the prior art described above, the present invention aims to achieve saturation magnetization of rare earth magnets with a lower magnetization magnetic field without reducing the efficiency of magnetization work. The purpose of this invention is to provide a magnetization method.
即ち、本発明は、希土類金属と遷移金属を主成分とする
金属間化合物からなる永久磁石にｌ０ＫＨｚ〜５０ＭＨ
ｚの高周波磁界を印加した後に、前記永久磁石にパルス
磁界を印加して着磁することを特徴とする永久磁石の着
磁方法を内容とする。That is, the present invention provides a permanent magnet made of an intermetallic compound containing rare earth metals and transition metals as main components.
The method of magnetizing a permanent magnet is characterized in that after applying a high frequency magnetic field of z, a pulsed magnetic field is applied to the permanent magnet to magnetize it.
希土類磁石に高周波磁界を印加した場合、ヒステリシス
損失及びうず電流損失等のいわゆる高周波損失が発生す
る。かかる高周波を置火は熱に変換されるため、高周波
磁界の印加によって希±ｖ１磁石は自己発熱する。When a high frequency magnetic field is applied to a rare earth magnet, so-called high frequency losses such as hysteresis loss and eddy current loss occur. Since such high frequency waves are converted into heat, the rare ±v1 magnet self-heats due to the application of the high frequency magnetic field.
通常、希土類磁石の保磁力（ｉＨＣ）は負の温度係数を
有しており、温度の上昇にともなってｉＨｃは低下する
０本発明はかかる希土類磁石のｉＨｃの低下を、前記の
如く高周波磁界の印加による自己発熱によって実現せし
めたものである。しかる後、希土類磁石のｉ Ｈｃが低
い状態の間に着磁磁場を印加することによって、より低
い着磁磁場で飽和着磁を可能とさせることができる。Normally, the coercive force (iHC) of a rare earth magnet has a negative temperature coefficient, and iHc decreases as the temperature rises. This was achieved by self-heating due to the applied voltage. Thereafter, by applying a magnetizing magnetic field while the i Hc of the rare earth magnet is low, saturation magnetization can be made possible with a lower magnetizing magnetic field.
又、本発明の如き着磁方法によれば、パルス着磁装置の
電源を充電している間に高周波磁界を印加することがで
きるため、従来法の如きパルス着磁方法に比べて着磁作
業の能率を何ら低下させない利点がある。Furthermore, according to the magnetization method of the present invention, a high-frequency magnetic field can be applied while the power supply of the pulse magnetization device is being charged, so the magnetization work is faster than that of the conventional pulse magnetization method. This has the advantage of not reducing efficiency in any way.
本発明における高周波（ｄ界は１０ＫＨｚ〜５０ＭＨｚ
の範囲のものが用いられる。高周波磁界の周波数が１０
ＫＨｚを下回ると、高周波損失が小さくなり、自己発熱
による希土類磁石の温度上昇が緩慢になり、着磁作業の
能率が低下するため好ましくない。一方、高周波磁界の
周波数が５０ＫＨｚを越えると、磁界強慶大なる高周波
磁界を得るのが困難となるばかりでなく、高周波磁界発
生用電源が大型且つ高価となるため工業上のメリットが
なくなり、好ましくない。又、本発明における高周波磁
界の強さが１エルステツドを下回ると、前記したヒステ
リシス損、うず電流積等の高周波損失が、高周波磁界の
周波数が高（なったとしても大きくならず希土類磁石を
所望の温度まで上昇させるために長時間を要するため、
好ましくは高周波磁界の強さを１エルステッド以上とす
るのが望ましい。更に、自己発熱速度を大きくし、短時
間で所定温度に到達させるために、高周波磁界の強さが
１０エルステッド以上であることがより望ましい。High frequency (d field is 10KHz to 50MHz) in the present invention
Those within the range of are used. The frequency of the high frequency magnetic field is 10
If it is lower than KHz, the high frequency loss becomes small, the temperature rise of the rare earth magnet due to self-heating becomes slow, and the efficiency of magnetization work decreases, which is not preferable. On the other hand, if the frequency of the high-frequency magnetic field exceeds 50 KHz, it is not only difficult to obtain a high-frequency magnetic field with a strong magnetic field, but also the power source for generating the high-frequency magnetic field becomes large and expensive, which eliminates the industrial advantage. do not have. Furthermore, if the strength of the high-frequency magnetic field in the present invention is less than 1 oersted, the above-mentioned high-frequency losses such as hysteresis loss and eddy current product will not increase even if the frequency of the high-frequency magnetic field becomes high (even if the frequency becomes high), and the rare earth magnet cannot be Because it takes a long time to raise the temperature,
Preferably, the strength of the high frequency magnetic field is 1 Oe or more. Further, in order to increase the self-heating rate and reach the predetermined temperature in a short time, it is more desirable that the strength of the high frequency magnetic field is 10 Oe or more.
本発明の希土類金属と遷移金属とを主成分とする合金磁
石とは、ＳｍＣｏ５ 、Ｓｍ−、Ｃｏｔ？あるいはＮｄ
−Ｆｅ−Ｂ系合金磁石として知られている希土ＩＨｆｆ
石、その他である。これらの中でも高い磁気性能を存す
るＮｄ−Ｆｅ−Ｂ系合金磁石の着磁方法として用いるこ
とが好ましい。更には、希土類金属と遷移金属とを主成
分とする合金磁石粉を有機バインダーで固着せしめたプ
ラスチックモールド磁石の着磁方法としても本発明を用
いることができる。The alloy magnets of the present invention whose main components are rare earth metals and transition metals include SmCo5, Sm-, Cot? Or Nd
-Rare earth IHff known as Fe-B alloy magnet
Stones, etc. Among these, it is preferable to use the method for magnetizing Nd-Fe-B alloy magnets, which have high magnetic performance. Furthermore, the present invention can also be used as a method for magnetizing a plastic molded magnet in which alloy magnet powder containing rare earth metals and transition metals as main components is fixed with an organic binder.
「実施例」
以下、本発明を実施例により、説明するが本発明はこれ
らにより何ら制限されるものではない。"Examples" The present invention will be explained below with reference to Examples, but the present invention is not limited to these in any way.
実施例１
外径１２．５龍、高さ８．５ ｍの円柱状のＮｄ−Ｆａ
−１３焼結磁石を第１図に示した如き高周波磁界発生コ
イルに挿入し、周波数ＩＭＨｚ、励磁磁界の強さ５０エ
ルステツドの条件の高周波磁界を５秒間印加した後に、
すぐに第２図に示した如き空心コイルによってパルス着
磁を行った。第３図に、パルス磁界の強さに対するＮｄ
−Ｆｅ−Ｂ焼結磁石の総磁束量の変化を示した。総磁束
量の測定はフラックスメーターを用いて行った。Example 1 Cylindrical Nd-Fa with an outer diameter of 12.5 mm and a height of 8.5 m
-13 A sintered magnet was inserted into a high-frequency magnetic field generating coil as shown in Fig. 1, and after applying a high-frequency magnetic field with a frequency of IMHz and an excitation magnetic field strength of 50 oersteds for 5 seconds,
Pulse magnetization was immediately performed using an air-core coil as shown in FIG. Figure 3 shows the relationship between Nd and the strength of the pulsed magnetic field.
-The change in total magnetic flux of the Fe-B sintered magnet is shown. The total amount of magnetic flux was measured using a flux meter.
実施例２
高周波磁界の印加時間を１０秒とする以外は実施例１と
全（同様に操作して、パルス磁界の強さに対する総磁束
量の変化を第３図に示した。Example 2 The procedure was the same as in Example 1 except that the high-frequency magnetic field was applied for 10 seconds, and the changes in the total magnetic flux with respect to the strength of the pulsed magnetic field are shown in FIG.
実施例３
高周波磁界の強さが０．５エルステツドであること以外
は実施例１と全く同様に操作して、パルス磁界の強さに
対する総磁束量の変化を第３図に示した。Example 3 The operation was carried out in exactly the same manner as in Example 1 except that the strength of the high-frequency magnetic field was 0.5 oersted, and the change in the total magnetic flux amount with respect to the strength of the pulsed magnetic field is shown in FIG. 3.
比較例
実施例１と同様のＮｄ−Ｆｅ−Ｂ焼結磁石を用い、高周
波磁界を印加しないで、第２図に示した空心コイルによ
ってパルス着磁を行った。パルス磁界の強さに対する総
磁束量の変化を第３図に示した。Comparative Example Using the same Nd-Fe-B sintered magnet as in Example 1, pulse magnetization was performed using the air-core coil shown in FIG. 2 without applying a high-frequency magnetic field. Figure 3 shows the change in total magnetic flux with respect to the strength of the pulsed magnetic field.
第３図から明らかなように、本発明の実施例１〜３によ
れば、従来の着磁力法である比較例に比ベてより低いパ
ルス着Ｉｎ Ｔｆｆ場で飽和着磁することが可能となる
。又、高周波磁界の強さを大きくするか、印加時間を長
くすることで、より低い磁場での飽和着磁が可能となる
。As is clear from FIG. 3, according to Examples 1 to 3 of the present invention, it is possible to achieve saturation magnetization with a lower pulsed In Tff field than in the comparative example using the conventional magnetizing force method. Become. Furthermore, by increasing the strength of the high-frequency magnetic field or lengthening the application time, saturation magnetization can be achieved with a lower magnetic field.
「作用・効果」
以上詳述した如く、本発明の着磁方法を用いることによ
って、従来、飽和着磁するために高い着磁磁場を必要と
していた希土類磁石をより低い着は磁場でしかも着磁作
業の能率を低下させることなく飽和着磁をすることが可
能となる。"Function/Effects" As detailed above, by using the magnetization method of the present invention, rare earth magnets that conventionally required a high magnetization magnetic field for saturation magnetization can be magnetized with a lower magnetic field. It becomes possible to perform saturation magnetization without reducing work efficiency.
第１図は本発明に用いる高周波磁界印加方法を示す説明
図、第２図は通常のパルス着磁法を示す説明図、第３図
は本発明の実施例と比較例のパルス着磁磁場の強さに対
する総磁束量の変化を示すグラフである。
１・・・Ｎｄ−Ｆｅ−Ｂ焼結磁石
２・・・高周波磁界発生用コイル
３・・・パルス着磁用コイル
第１ 図
零２図
第３図Fig. 1 is an explanatory diagram showing the high frequency magnetic field application method used in the present invention, Fig. 2 is an explanatory diagram showing the normal pulse magnetization method, and Fig. 3 is an explanatory diagram showing the pulse magnetization magnetic field of the example of the present invention and the comparative example. It is a graph showing changes in total magnetic flux amount with respect to strength. 1... Nd-Fe-B sintered magnet 2... High-frequency magnetic field generation coil 3... Pulse magnetization coil 1 Figure 0 2 Figure 3
Claims (1)
からなる永久磁石に１０ＫＨｚ〜５０ＭＨｚの高周波磁
界を印加した後に、前記永久磁石にパルス磁界を印加し
て着磁することを特徴とする永久磁石の着磁方法。 ２、高周波磁界の強さが１エルステッド以上である特許
請求の範囲第１項記載の着磁方法。[Claims] 1. After applying a high frequency magnetic field of 10 KHz to 50 MHz to a permanent magnet made of an intermetallic compound containing rare earth metals and transition metals as main components, a pulsed magnetic field is applied to the permanent magnet to magnetize it. A method of magnetizing a permanent magnet, characterized by: 2. The magnetization method according to claim 1, wherein the strength of the high-frequency magnetic field is 1 Oe or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4953287A JPS63213907A (en) | 1987-03-03 | 1987-03-03 | Magnetization of permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4953287A JPS63213907A (en) | 1987-03-03 | 1987-03-03 | Magnetization of permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63213907A true JPS63213907A (en) | 1988-09-06 |
| JPH0366802B2 JPH0366802B2 (en) | 1991-10-18 |
Family
ID=12833767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4953287A Granted JPS63213907A (en) | 1987-03-03 | 1987-03-03 | Magnetization of permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63213907A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0346204A (en) * | 1989-07-01 | 1991-02-27 | Jionkoo Kantee Guufun Yousenkonsuu | Method of improving magnetizing properties by high frequency magne- tic field |
| JPH0346205A (en) * | 1989-07-01 | 1991-02-27 | Jionkoo Kantee Guufun Yousenkonsuu | Method of improving magnetizing properties by ac or pulse currents |
| JP2008091443A (en) * | 2006-09-29 | 2008-04-17 | Tdk Corp | Method and apparatus for magnetizing magnet material |
-
1987
- 1987-03-03 JP JP4953287A patent/JPS63213907A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0346204A (en) * | 1989-07-01 | 1991-02-27 | Jionkoo Kantee Guufun Yousenkonsuu | Method of improving magnetizing properties by high frequency magne- tic field |
| JPH0346205A (en) * | 1989-07-01 | 1991-02-27 | Jionkoo Kantee Guufun Yousenkonsuu | Method of improving magnetizing properties by ac or pulse currents |
| JP2008091443A (en) * | 2006-09-29 | 2008-04-17 | Tdk Corp | Method and apparatus for magnetizing magnet material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0366802B2 (en) | 1991-10-18 |
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