JPH0454364B2 - - Google Patents
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- Publication number
- JPH0454364B2 JPH0454364B2 JP63142018A JP14201888A JPH0454364B2 JP H0454364 B2 JPH0454364 B2 JP H0454364B2 JP 63142018 A JP63142018 A JP 63142018A JP 14201888 A JP14201888 A JP 14201888A JP H0454364 B2 JPH0454364 B2 JP H0454364B2
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- magnetization
- coil
- magnetic field
- current
- 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
Links
- 230000005415 magnetization Effects 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、比較的小さなパルス磁場強さで保磁
力が大きな永久磁石や形状的に着磁が困難だつた
永久磁石を十分に着磁できるパルス着磁技術に関
し、更に詳しくは、独立した複数系統のコイルに
僅かな時間差をおいてパルス電流を順次供給して
着磁するパルス着磁方法及びそれに用いる着磁装
置に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention can sufficiently magnetize permanent magnets with a large coercive force or permanent magnets that are difficult to magnetize due to their shape with a relatively small pulsed magnetic field strength. The present invention relates to pulse magnetization technology, and more specifically relates to a pulse magnetization method in which a plurality of independent systems of coils are magnetized by sequentially supplying pulsed currents with slight time differences, and a magnetization device used therein.
［従来の技術］
永久磁石を着磁する方法として、電磁石による
方法とパルス磁場による方法とがある。[Prior Art] There are two methods of magnetizing a permanent magnet: a method using an electromagnet and a method using a pulsed magnetic field.
電磁石による方法ではコイルと磁気回路とを組
み合わせた着磁装置を用い、コイルに通電するこ
とによつて生じる磁束を狭い空間に集中させ、発
生する磁場により永久磁石を着磁する方法であ
る。通常、通電時間は秒オーダーであり、通電電
流は最大約600A程度である。 The electromagnetic method uses a magnetizing device that combines a coil and a magnetic circuit, concentrates the magnetic flux generated by energizing the coil in a narrow space, and magnetizes a permanent magnet using the generated magnetic field. Normally, the energizing time is on the order of seconds, and the energizing current is about 600 A at maximum.
パルス磁場による方法は、空心コイル又はコイ
ルと磁気回路とを組み合わせた着磁装置を用い、
コイルにパルス電流を供給し、発生する磁場によ
り永久磁石を着磁する。従来技術では第３図に示
すように、コイル１０は１系統であり、パルス電
源１２は単発パルス電流を発生しコイル１０に供
給する。通常、通電時間はミリ秒オーダー以下で
あり、通電電流は使用するコイル径によるが約
8000A程度以上である。 The method using a pulsed magnetic field uses an air-core coil or a magnetizing device that combines a coil and a magnetic circuit,
A pulse current is supplied to the coil, and the generated magnetic field magnetizes the permanent magnet. In the prior art, as shown in FIG. 3, the coil 10 has one system, and the pulse power source 12 generates a single pulse current and supplies it to the coil 10. Normally, the energizing time is on the order of milliseconds or less, and the energizing current depends on the diameter of the coil used, but it is approximately
It is about 8000A or more.
この種のパルス電源１２としては、コンデンサ
を有し、それに充電して貯えた電気エネルギーを
瞬間大電流としてコイル１０に流す方式が一般的
である。例えば1kV、2000μFのコンデンサを備
えたパルス電源により６ターンの空心コイルに通
電したとき、その中央での磁場は第４図に示すよ
うなものとなる。 This type of pulse power source 12 generally includes a capacitor, and stores electrical energy that is charged in the capacitor and causes the electrical energy to flow through the coil 10 as an instantaneous large current. For example, when a 6-turn air-core coil is energized by a pulse power source equipped with a 1kV, 2000μF capacitor, the magnetic field at its center will be as shown in Figure 4.
［発明が解決しようとする課題］
電磁石による着磁方法では、フル着磁するには
永久磁石の保磁力の２倍程度の磁場で済む利点が
ある反面、着磁に要する時間がパルス着磁に比べ
て長い欠点がある。このため生産性が悪く、量産
の時には専らパルス着磁が使用されている。[Problem to be solved by the invention] Although the magnetization method using an electromagnet has the advantage that a magnetic field of about twice the coercive force of a permanent magnet is required for full magnetization, on the other hand, the time required for magnetization is longer than pulse magnetization. There are long disadvantages in comparison. For this reason, productivity is poor, and pulse magnetization is exclusively used for mass production.
パルス着磁方法は量産に適するが、フル着磁す
るには永久磁石の保磁力の３倍以上の磁場強さが
必要であるとされ、コイルに流す電流はコイル発
熱のためコイル径により決定されるから十分な磁
場強さが得られない欠点がある。このため特に保
磁力の大きな永久磁石や形状的に着磁が困難な永
久磁石では十分に着磁されず、その状態のまま使
用しているのが現状である。 The pulse magnetization method is suitable for mass production, but it is said that a magnetic field strength three times or more than the coercive force of a permanent magnet is required for full magnetization, and the current flowing through the coil is determined by the coil diameter because the coil generates heat. The disadvantage is that sufficient magnetic field strength cannot be obtained. For this reason, permanent magnets with a particularly large coercive force or permanent magnets whose shape makes it difficult to magnetize are not sufficiently magnetized and are currently used in that state.
本発明の目的は、上記のような従来技術の欠点
を解消し、比較的小さなパルス磁場強さでも保磁
力の大きな永久磁石等を十分に着磁することがで
きるようなパルス着磁方法とそれに用いる着磁装
置を提供することにある。 The purpose of the present invention is to provide a pulse magnetization method that eliminates the drawbacks of the prior art as described above and can sufficiently magnetize a permanent magnet with a large coercive force even with a relatively small pulse magnetic field strength. An object of the present invention is to provide a magnetizing device for use in the present invention.
［課題を解決するための手段］
上記の目的を達成できる本発明は、独立した複
数系統のコイルを備えた着磁器を用い、各系統の
コイルに僅かな時間差をおいてパルス電流を順次
供給して着磁するようにしたパルス着磁方法であ
る。ここで僅かな時間差とは、先行するパルス電
流と次のパルス電流とが時間的に一部分重なり合
うタイミングを言う。より好ましくは先行するパ
ルス電流による磁場強さが最大磁場強さの半分程
度に下降した時に次のパルス電流による磁場強さ
がその最大磁場強さの半分程度まで上昇するよう
なタイミングとする。[Means for Solving the Problems] The present invention, which can achieve the above object, uses a magnetizer equipped with multiple independent coil systems, and sequentially supplies pulsed current to the coils of each system with a slight time difference. This is a pulse magnetization method in which magnetization is performed using Here, the slight time difference refers to the timing at which the preceding pulse current and the next pulse current partially overlap in time. More preferably, the timing is such that when the magnetic field strength due to the preceding pulse current drops to about half of the maximum magnetic field strength, the magnetic field strength due to the next pulse current increases to about half of the maximum magnetic field strength.
従つて本発明では上記のように独立した複数系
統のコイルを備えた着磁器と、前記各コイルにそ
れぞれ接続されてパルス電流を供給する複数のパ
ルス電源と、各パルス電源が僅かな（パルス電流
継続時間未満の）時間差をおいて順次放電するよ
うに各パルス電源の放電のタイミングを制御する
制御回路からなるパルス着磁装置を用いる。 Therefore, in the present invention, as described above, a magnetizer is provided with a plurality of independent coil systems, a plurality of pulse power supplies are connected to each of the coils and supply pulse current, and each pulse power supply has a small (pulse current) A pulse magnetizing device is used that includes a control circuit that controls the discharge timing of each pulse power source so that the discharges are performed sequentially with a time difference (less than the duration).
［作用］
独立した複数系統のコイルに僅かな時間差をお
いてパルス電流を順次供給すると、発生する磁場
が合成され、事実上、通電時間が長くなつたのと
等価となり電磁石による着磁技術に近づく。[Effect] When pulsed currents are sequentially supplied to multiple independent coil systems with slight time differences, the generated magnetic fields are combined, and this is effectively equivalent to a longer energization time, approaching magnetization technology using electromagnets. .
従つて、ある保磁力を有する永久磁石を着磁す
るのに要する磁場強さは、従来の単発パルス電流
による場合よりも小さくて済む。このため従来、
着磁不足のまま使用されていた永久磁石の着磁が
改善され、従来よりも良好な永久磁石が容易に得
られることになる。 Therefore, the magnetic field strength required to magnetize a permanent magnet having a certain coercive force is smaller than that required using a conventional single pulse current. For this reason, conventionally,
The magnetization of permanent magnets that have been used with insufficient magnetization is improved, and permanent magnets that are better than conventional ones can be easily obtained.
［実施例］
第１図は本発明に係るパルス着磁方法の説明図
である。本発明では独立した複数系統（この実施
例では２系統）のコイル２０ａ，２０ｂを備えた
着磁器２２を用い、各系統のコイル２０ａ，２０
ｂに僅かな時間差をおいてパルス電流を順次供給
して着磁するように構成されている。[Example] FIG. 1 is an explanatory diagram of a pulse magnetization method according to the present invention. In the present invention, a magnetizer 22 having multiple independent systems (two systems in this embodiment) of coils 20a, 20b is used, and the coils 20a, 20 of each system are
It is configured to magnetize by sequentially supplying pulsed currents with a slight time difference between the points b and b.
各コイル２０ａ，２０ｂにはそれぞれパルス電
源２４ａ，２４ｂが接続されておりそれらは制御
回路２６に接続されて通電動作のタイミングが制
御される。各コイル２０ａ，２０ｂはここでは６
ターンであり、着磁器２２は空心コイル構造にな
つている。 Pulse power sources 24a and 24b are connected to each coil 20a and 20b, respectively, and these are connected to a control circuit 26 to control the timing of the energization operation. Each coil 20a, 20b is 6 here.
The magnetizer 22 has an air-core coil structure.
第１のコイル２０ａ及び第２のコイル２０ｂの
２系統に僅かな時間差をおいてパルス電流を供給
する。このパルス電源は、例えば従来同様、大容
量のコンデンサを使用し、それに充電して貯えた
エネルギーを瞬間大電流として各コイルに供給す
る方式である。放電のタイミングは制御回路２６
によつて制御される。両コイル２０ａ，２０ｂに
僅かな時間差をおいてパルス電流を供給すると、
着磁器２２に発生する磁場は重ね合わされ、事実
上、発生磁場の継続時間が長くなる。例えば
1kV、2000μFのコンデンサを使用する２系統の
パルス電源２４ａ，２４ｂに0.3ｍsecの時間差を
おいて通電した場合には、第２図Ａに示すような
パルス磁場が生じる。これらそれぞれのパルス磁
場H1，H2は第４図に示す従来技術と同程度のも
のである。ところが僅かな時間差をおいて順次各
コイル２０ａ，２０ｂに供給されるため、それら
が合成されて第２図Ｂに示すような磁場となる。 Pulse current is supplied to two systems, the first coil 20a and the second coil 20b, with a slight time difference. This pulse power supply, for example, uses a large-capacity capacitor, and the energy stored in the capacitor is charged and supplied to each coil as an instantaneous large current. The timing of discharge is determined by the control circuit 26.
controlled by. When pulsed current is supplied to both coils 20a and 20b with a slight time difference,
The magnetic fields generated in the magnetizer 22 are superimposed, and the duration of the generated magnetic fields is effectively increased. for example
When two pulse power sources 24a and 24b using 1kV and 2000μF capacitors are energized with a time difference of 0.3msec, a pulsed magnetic field as shown in FIG. 2A is generated. These respective pulsed magnetic fields H 1 and H 2 are comparable to those of the prior art shown in FIG. However, since they are sequentially supplied to each coil 20a, 20b with a slight time difference, they are combined to form a magnetic field as shown in FIG. 2B.
このようなパルス着磁方法を用いてBr＝
11.0kG、iHc＝9.0kOeの永久磁石の着磁を行い、
その表面磁束密度Bsを測定したところ、第３図
及び第４図に示すような従来方法では1200Gであ
つたのに対して、第１図及び第２図に示すような
本発明方法によれば1300Gとなり磁石特性は向上
した。 Using such a pulse magnetization method, Br=
Magnetize the permanent magnet at 11.0kG, iHc=9.0kOe,
When we measured the surface magnetic flux density Bs, it was 1200G in the conventional method as shown in Figures 3 and 4, but in the method of the present invention as shown in Figures 1 and 2. 1300G and improved magnetic properties.
このように本発明によれば従来技術では保磁力
が大きかつたり、あるいは形状的理由から着磁不
足で使用されていた永久磁石の着磁が改善され、
従来技術よりも大きな表面磁束密度が得られるこ
とになる。 As described above, according to the present invention, the magnetization of permanent magnets, which were used in the prior art due to large coercive force or insufficient magnetization due to shape reasons, has been improved.
A larger surface magnetic flux density can be obtained than in the prior art.
本発明の着磁方法は永久磁石であればどのよう
な材質のものにでも適用することができ、例えば
サマリウム−コバルト系、フエライト系、アルニ
コ系、ネオジウム−鉄−ボロン系等の永久磁石
や、それらを用いたボンド磁石の着磁にも適用可
能である。また異方性や等方性の如何に関わらず
適用でき、特に希土類系の保磁力の大きな等方性
磁石を着磁するのに有効である。 The magnetization method of the present invention can be applied to permanent magnets made of any material, such as permanent magnets made of samarium-cobalt, ferrite, alnico, neodymium-iron-boron, etc. It is also applicable to magnetizing bonded magnets using them. Furthermore, it can be applied regardless of whether it is anisotropic or isotropic, and is particularly effective for magnetizing isotropic rare earth magnets with a large coercive force.
以上本発明の好ましい一実施例について詳述し
たが、本発明はこのような構成のみに限定される
ものではない。上記の実施例では２系統のコイル
を用いているが、３系統以上のコイルを備えてい
るものにも同様に適用できるし、空心コイル型の
みならず着磁ヨークを使用してコイルと磁気回路
とを組み合わせる構造のものにも適用することが
できる。また軸方向着磁のみならず、ラジアル方
向多極着磁や極着磁等任意の着磁パターンにも対
応できる。 Although a preferred embodiment of the present invention has been described above in detail, the present invention is not limited to only such a configuration. In the above embodiment, two systems of coils are used, but it can be similarly applied to systems equipped with three or more systems of coils. It can also be applied to structures that combine. Furthermore, it is possible to support not only axial magnetization but also arbitrary magnetization patterns such as radial multi-pole magnetization and polar magnetization.
［発明の効果］
本発明は上記のように独立した複数系統のコイ
ルを備えた着磁器を用い各系統のコイルに僅かな
時間差をおいてパルス電流を順次供給して着磁す
るように構成したパルス着磁方法であるから、量
産化に適すると言うパルス着磁の利点を生かしつ
つ、ある保磁力を有する磁石を着磁するのに要す
る磁場強さは従来技術よりも小さくて済むし、ま
た従来技術では保磁力が大きかつたり形状的理由
から着磁不足の状態で使用されていた永久磁石で
あつても、その着磁状態が改善され従来品よりも
良好な磁石特性が得られる効果がある。[Effects of the Invention] As described above, the present invention uses a magnetizer equipped with multiple independent coil systems, and is configured to sequentially supply pulsed current to the coils of each system with a slight time difference for magnetization. Since it is a pulse magnetization method, while taking advantage of the advantage of pulse magnetization that is suitable for mass production, the magnetic field strength required to magnetize a magnet with a certain coercive force is smaller than that of conventional technology. With conventional technology, even if a permanent magnet is used with a large coercive force or with insufficient magnetization due to its shape, the magnetization state is improved and better magnetic properties can be obtained than with conventional products. be.
また本発明では独立した複数系統のコイルを備
えた着磁器を使用し、それらにそれぞれ別個のパ
ルス電源を接続し、制御回路によつて任意のタイ
ミングでそれらの通電動作タイミングを制御させ
るため、系統数が多くなつても装置構成は複雑に
ならず、また電流値を可変したりパルス電流供給
の時間差を容易に可変することができ、永久磁石
に適した着磁状態を容易に設定することができる
効果もある。 In addition, in the present invention, a magnetizer equipped with multiple independent systems of coils is used, each of which is connected to a separate pulse power source, and the control circuit controls the energization operation timing of each system at an arbitrary timing. Even if the number of magnets increases, the device configuration will not become complicated, and the current value and pulse current supply time difference can be easily varied, making it easy to set the magnetization state suitable for permanent magnets. There are some effects that can be achieved.
第１図は本発明に係るパルス着磁方法の説明
図、第２図Ａ，Ｂはそれにより得られるパルス磁
場を示すグラフである。また第３図は従来のパル
ス着磁方法を示す説明図、第４図はそれにより得
られるパルス磁場の一例を示すグラフである。
２０ａ，２０ｂ……コイル、２２……着磁器、
２４ａ，２４ｂ……パルス電源、２６……制御回
路。
FIG. 1 is an explanatory diagram of the pulsed magnetization method according to the present invention, and FIGS. 2A and 2B are graphs showing the pulsed magnetic field obtained thereby. Further, FIG. 3 is an explanatory diagram showing a conventional pulsed magnetization method, and FIG. 4 is a graph showing an example of a pulsed magnetic field obtained by the method. 20a, 20b...Coil, 22...Magnetizer,
24a, 24b...Pulse power supply, 26...Control circuit.
Claims (1)
用い、先行するパルス電流と次のパルス電流とが
時間的に一部分重なり合うようなタイミングで各
系統のコイルにパルス電流を順次供給して着磁す
ることを特徴とするパルス着磁方法。 ２ 独立した複数系統のコイルを備えた着磁器
と、前記各コイルにそれぞれ接続されてパルス電
流を供給する複数のパルス電源と、各パルス電源
がパルス電流継続時間未満の時間差をおいて順次
放電するように各パルス電源の放電のタイミング
を制御する制御回路を具備しているパルス着磁装
置。[Claims] 1. Using a magnetizer equipped with multiple independent coil systems, a pulse current is sequentially applied to the coils of each system at a timing such that the preceding pulse current and the next pulse current partially overlap in time. A pulse magnetization method characterized by supplying and magnetizing. 2. A magnetizer equipped with multiple independent coil systems, a plurality of pulse power supplies each connected to each of the coils and supplying a pulse current, and each pulse power supply discharging sequentially with a time difference less than the pulse current duration time. A pulse magnetizing device is equipped with a control circuit that controls the discharge timing of each pulse power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14201888A JPH01310516A (en) | 1988-06-09 | 1988-06-09 | Method for pulse magnetization and magnetizer used for it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14201888A JPH01310516A (en) | 1988-06-09 | 1988-06-09 | Method for pulse magnetization and magnetizer used for it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01310516A JPH01310516A (en) | 1989-12-14 |
| JPH0454364B2 true JPH0454364B2 (en) | 1992-08-31 |
Family
ID=15305458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14201888A Granted JPH01310516A (en) | 1988-06-09 | 1988-06-09 | Method for pulse magnetization and magnetizer used for it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01310516A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3172611B2 (en) * | 1992-11-30 | 2001-06-04 | 株式会社イムラ材料開発研究所 | Superconductor magnetizer |
| JP4899761B2 (en) * | 2006-09-29 | 2012-03-21 | Ｔｄｋ株式会社 | Magnet body magnetizing method and magnetizing apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5814577U (en) * | 1981-07-21 | 1983-01-29 | 三菱重工業株式会社 | Assembly type dresser cutter spring |
-
1988
- 1988-06-09 JP JP14201888A patent/JPH01310516A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5814577U (en) * | 1981-07-21 | 1983-01-29 | 三菱重工業株式会社 | Assembly type dresser cutter spring |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01310516A (en) | 1989-12-14 |
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