JPH0366802B2 - - Google Patents
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- Publication number
- JPH0366802B2 JPH0366802B2 JP4953287A JP4953287A JPH0366802B2 JP H0366802 B2 JPH0366802 B2 JP H0366802B2 JP 4953287 A JP4953287 A JP 4953287A JP 4953287 A JP4953287 A JP 4953287A JP H0366802 B2 JPH0366802 B2 JP H0366802B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- magnetization
- rare earth
- frequency magnetic
- magnetizing
- 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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- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
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、従来のフエラ
イト系、アルニコ系磁石に比べて優れた磁気特性
を有しいるため、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.
これらの希土類磁石は、通常極めて高い保磁力
（iHc）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 earth magnets usually have an extremely high coercive force (iHc), so 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, and the magnetizing yoke generates heat due to such a large current, 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を内容とする。 That is, the present invention provides a permanent magnet made of an intermetallic compound whose main components are rare earth metals and transition metals.
The content is a method of magnetizing a permanent magnet, which comprises applying a high frequency magnetic field of ~50 MHz and then applying a pulsed magnetic field 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。かかる高周波損失は熱に変換
されるため、高周波磁界の印加によつて希土類磁
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 loss is converted into heat, the rare earth magnet self-heats when a high frequency magnetic field is applied.
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つてiHc
は低下する。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
発熱によつて実現せしめたものである。しかる
後、希土類磁石のiHcが低い状態の間に着磁磁場
を印加することによつて、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 rare earth magnets has a negative temperature coefficient, and as the temperature rises, iHc
decreases. The present invention achieves such a reduction in iHc of the rare earth magnet by self-heating due to the application of a high frequency magnetic field as described above. Thereafter, by applying a magnetizing magnetic field while the iHc 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磁界は10KHz〜50MHzの
範囲のものが用いられる。高周波磁界の周波数が
10KHzが下回ると、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50MHzを越える
と、磁界強度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ツトがなくな
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、うず電流損等の高周波損失が、
高周波磁界の周波数が高くなつたとしても大きく
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エルステツ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エルステツド以上であることがより望ましい。 The high frequency magnetic field used in the present invention is in the range of 10 KHz to 50 MHz. The frequency of the high frequency magnetic field is
If it is below 10 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 MHz, it is not only difficult to obtain a high-frequency magnetic field with a high magnetic field strength, but also the power source for generating the high-frequency magnetic field becomes large and expensive, which eliminates the industrial merit, which is undesirable. . Furthermore, when the strength of the high-frequency magnetic field in the present invention is less than 1 oersted, high-frequency losses such as the hysteresis loss and eddy current loss described above,
Even if the frequency of the high-frequency magnetic field increases, it does not increase and it takes a long time to raise the rare earth magnet to the desired temperature, so it is preferable that the strength of the high-frequency magnetic field is 1 oersted or more. Furthermore, in order to increase the self-heating rate and reach the specified temperature in a short time, the strength of the high-frequency magnetic field is increased.
More preferably, it is 10 oersted 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、Sm2、Co17あるいは
Nd−Fe−Ｂ系合金磁石として知られている希土
類磁石、その他である。これらの中でも高い磁気
性能を有する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ツクモールド
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 magnet of the present invention whose main components are rare earth metals and transition metals is SmCo 5 , Sm 2 , Co 17 or
These include rare earth magnets known as Nd-Fe-B alloy magnets, and others. Among these, it is preferable to use it as a method for magnetizing Nd-Fe-B alloy magnets having 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12.5mm、高さ8.5mmの円柱状のNd−Fe−Ｂ
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1MHz、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
よつてパルス着磁を行つた。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ツクス
メーターを用いて行つた。Example 1 Cylindrical Nd-Fe-B with an outer diameter of 12.5 mm and a height of 8.5 mm
A sintered magnet is inserted into a high-frequency magnetic field generating coil as shown in Figure 1, and the frequency is 1MHz and the excitation magnetic field strength is 50.
Immediately after applying a high-frequency magnetic field under Oersted conditions for 5 seconds, pulse magnetization was performed using an air-core coil as shown in FIG. FIG. 3 shows the change in the total magnetic flux of the Nd-Fe-B sintered magnet with respect to the strength of the pulsed magnetic field. 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 2 The operation was performed in exactly the same manner 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 performed 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
空心コイルによつてパルス着磁を行つた。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、従来の着磁方法である比較例に比
べてより低いパルス着磁磁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, Example 1 of the present invention
According to 3 to 3, it is possible to perform saturation magnetization with a lower pulsed magnetizing magnetic field than in the comparative example, which is a conventional magnetizing method. 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
ことによつて、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
磁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/Effect" As detailed above, by using the magnetization method of the present invention, rare earth magnets that conventionally required a high magnetization field to be saturated can be magnetized with a lower magnetization field. It becomes possible to perform saturation magnetization without reducing the efficiency of magnetization work.
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。
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.
Claims (1)
化合物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エルステツド以上であ
る特許請求の範囲第１項記載の着磁方法。[Scope of Claims] 1. After applying a high frequency magnetic field of 10 KHz to 50 MHz to a permanent magnet made of an intermetallic compound whose main components are rare earth metals and transition metals, the permanent magnet is magnetized by applying a pulsed magnetic field. A permanent magnet magnetization method characterized by: 2. The magnetization method according to claim 1, wherein the strength of the high-frequency magnetic field is 1 oersted 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 JPS63213907A (en) | 1988-09-06 |
| JPH0366802B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0346205A (en) * | 1989-07-01 | 1991-02-27 | Jionkoo Kantee Guufun Yousenkonsuu | Method of improving magnetizing properties by ac or pulse currents |
| JPH0346204A (en) * | 1989-07-01 | 1991-02-27 | Jionkoo Kantee Guufun Yousenkonsuu | Method of improving magnetizing properties by high frequency magne- tic field |
| JP4899761B2 (en) * | 2006-09-29 | 2012-03-21 | Ｔｄｋ株式会社 | Magnet body magnetizing method and magnetizing apparatus |
-
1987
- 1987-03-03 JP JP4953287A patent/JPS63213907A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63213907A (en) | 1988-09-06 |
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