JP2692834B2 - Dust core - Google Patents
Dust coreInfo
- Publication number
- JP2692834B2 JP2692834B2 JP63046041A JP4604188A JP2692834B2 JP 2692834 B2 JP2692834 B2 JP 2692834B2 JP 63046041 A JP63046041 A JP 63046041A JP 4604188 A JP4604188 A JP 4604188A JP 2692834 B2 JP2692834 B2 JP 2692834B2
- Authority
- JP
- Japan
- Prior art keywords
- dust core
- rust
- rust preventive
- molded body
- iron
- 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 - Fee Related
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- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
- Soft Magnetic Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、モータやトランス等の電気機器の磁心や、
磁石等に用いられる圧粉磁心に係り、特に、防錆能力が
向上された圧粉磁心に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a magnetic core of an electric device such as a motor and a transformer,
The present invention relates to a dust core used for a magnet or the like, and particularly to a dust core having an improved rust prevention ability.
（従来の技術） 従来より、鉄若しくは鉄合金よりなる磁性粉をバイン
ダー樹脂を用いて結合させ成形した圧粉磁心が良く知ら
れている（例えば、特公昭47−22514号、特公昭50−142
07号、特開昭49−4197号等）。(Prior Art) Conventionally, a powder magnetic core formed by binding magnetic powder made of iron or an iron alloy using a binder resin and molding the same has been well known (for example, Japanese Patent Publication No. 47-22514 and Japanese Patent Publication No. 50-142).
07, JP-A-49-4197, etc.).
この種の圧粉磁心は、鉄若しくは鉄合金よりなる磁性
粉と、エポキシ樹脂等のバインダー樹脂とを混合した
後、圧縮成形して形成されるか、若しくは、磁性粉にエ
ポキシ樹脂等のバインダー樹脂を被覆した後、圧縮成形
して形成されている。This kind of dust core is formed by mixing magnetic powder made of iron or an iron alloy with a binder resin such as an epoxy resin and then compression-molding the magnetic powder, or by binding the magnetic powder to a binder resin such as an epoxy resin. After being coated, it is formed by compression molding.
（発明が解決しようとする課題） しかしながら、前記圧粉磁心は、鉄や鉄合金を磁性材
料に用いているため、高温多湿の環境に置かれると、赤
錆が発生しやすいという欠点を有する。(Problems to be Solved by the Invention) However, since the dust core uses iron or an iron alloy as a magnetic material, it has a drawback that red rust easily occurs when placed in a hot and humid environment.
特に、圧粉磁心の表面部においては、圧縮成形時にお
ける擦れや、成形後の傷付等により樹脂被覆層が剥げや
すく、鉄や鉄合金からなる磁性粉の表面が剥き出しとな
ることが多く、赤錆が発生しやすくなる。In particular, in the surface portion of the dust core, rubbing during compression molding, the resin coating layer is easily peeled off by scratches after molding, and the surface of the magnetic powder made of iron or iron alloy is often exposed, Red rust is likely to occur.
また、圧粉磁心では、圧縮成形後の成形体内部に空隙
が残りやすく、このため、空隙内に水分が侵入して赤錆
発生の原因となることもあり問題であった。Further, in the dust core, voids are likely to remain inside the molded body after compression molding, so that moisture may enter the voids and cause red rust, which is a problem.
本発明は上記事情に鑑みてなされたものであって、鉄
若しくは鉄合金を磁性粉として用いた圧粉磁心の防錆能
力を向上し、錆の発生を防止することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the rust preventive ability of a dust core using iron or an iron alloy as magnetic powder and prevent rust from occurring.
（課題を解決するための手段） 上記目的を達成するため、本発明では、鉄若しくは鉄
合金よりなる磁性粉どうしをバインダー樹脂で結合させ
ると共に圧縮成形した成形体に、防錆剤を含浸して防錆
処理を施したことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, in the present invention, a magnetic powder made of iron or an iron alloy is bonded with a binder resin and compression-molded into a molded body, which is impregnated with a rust preventive agent. It is characterized by being subjected to rust prevention treatment.
また、本発明は、上記防錆剤として、 ・アクリル樹脂 ・ベンゾトリアゾール及びその誘導体 ・ソルビタンモノオレエート及びその誘導体 ・オレイン酸ナトリウム ・エチルアミン及びその誘導体 の何れかを用いたことを特徴とする。 Further, the present invention is characterized in that any one of: an acrylic resin, benzotriazole and a derivative thereof, sorbitan monooleate and a derivative thereof, sodium oleate, ethylamine and a derivative thereof, is used as the rust preventive agent.
（作用） 本発明では、鉄若しくは鉄合金よりなる磁性粉どうし
をバインダー樹脂で結合させると共に圧縮成形した成形
体に、防錆剤を含浸して防錆処理を施こしたことによ
り、磁性粉の腐食が防止され錆の発生が防止される。(Function) In the present invention, the magnetic powder made of iron or an iron alloy is bonded with a binder resin, and a molded body obtained by compression molding is impregnated with a rust preventive agent and subjected to a rust preventive treatment. Corrosion is prevented and rust is prevented from occurring.
（実 施 例） 以下、本発明を図示の実施例に基づいて詳細に説明す
る。Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
第１図に本発明による圧粉磁心の製造工程の一例を示
す。尚、第１図では圧粉磁心の成形体形成後に防錆処理
を施した例を示し、磁性粉に還元鉄粉、バインダー樹脂
にエポキシ樹脂を用い、配合比を、還元鉄粉97重量％に
対してエポキシ樹脂３重量％とした場合について示す。FIG. 1 shows an example of a manufacturing process of a dust core according to the present invention. Fig. 1 shows an example of rustproofing after forming a powder magnetic core compact, using reduced iron powder as the magnetic powder and epoxy resin as the binder resin, and adjusting the compounding ratio to 97% by weight of the reduced iron powder. In contrast, the case where the epoxy resin is 3% by weight is shown.
同図において、先ず、夫々の配合比で秤量された還元
鉄粉とエポキシ樹脂とを、撹拌機で１時間混合撹拌した
後（S2）、金型内に流し込み、圧縮圧力２トン/cm2で圧
縮成形する（S3）。圧縮成形によって形成された成形体
は150℃の温度の下で約１時間加熱処理され硬化される
（S4）。次に、加熱硬化後の成形体に防錆剤、例えばア
クリル系防錆樹脂を塗布、含浸し、防錆処理を施す（S
5）。そして、防錆処理後の成形体を乾燥し（S6）、圧
粉磁心が完成される。In the figure, first, the reduced iron powder and the epoxy resin, which are weighed in respective mixing ratios, are mixed and stirred by a stirrer for 1 hour (S2), and then poured into a mold at a compression pressure of 2 ton / cm 2 . Perform compression molding (S3). The compact formed by compression molding is heat-treated and cured at a temperature of 150 ° C. for about 1 hour (S4). Next, a rust preventive agent, such as an acrylic rust preventive resin, is applied to the heat-cured molded body, impregnated, and subjected to a rust preventive treatment (S
Five). Then, the molded body after the anticorrosion treatment is dried (S6), and the dust core is completed.
ここで、上記圧粉磁心の成形体形成後の防錆処理につ
いて、例を掲げてより詳細に説明する。Here, the rustproofing treatment after forming the molded body of the dust core will be described in more detail with reference to examples.
1.防錆剤として第１図に示す如くアクリル系防錆樹脂、
例えばアクリル塗料を用いた場合の処理剤。1. As a rust preventive agent, as shown in Fig. 1, acrylic rust preventive resin,
For example, a treating agent using acrylic paint.
（１）先ず、アクリル塗料（粘度260cps at 25℃）を等
重量のメチルエチルケトンで希釈する。(1) First, an acrylic paint (viscosity 260 cps at 25 ° C) is diluted with an equal weight of methyl ethyl ketone.
（２）次に、第４図に示す如く、浸漬タンク３内に満た
されたアクリル塗料の希釈液４中にバスケット２等を用
いて加熱硬化後の成形体１を約30秒間浸漬し、成形体１
にアクリル塗料を塗布、含浸する。(2) Next, as shown in FIG. 4, the molded body 1 after heat curing is immersed for about 30 seconds in a diluting solution 4 of acrylic paint filled in the dipping tank 3 by using a basket 2 and the like, and molded. Body 1
Apply acrylic paint to and impregnate.
（３）浸漬後の成形体を取りだし、60℃の温度で約１時
間放置し、乾燥させる。(3) The molded body after immersion is taken out, left at a temperature of 60 ° C. for about 1 hour, and dried.
（４）乾燥後の成形体を再びアクリル塗料の希釈液中に
浸漬する。(4) The dried molded body is again immersed in a diluting solution of acrylic paint.
（５）再浸漬後の成形体を再度乾燥させる。尚、塗料の
塗りむらを防ぐため、前回（３）の乾燥時において下面
側になっていた面を上面側として乾燥させる。(5) The molded body after the re-immersion is dried again. In addition, in order to prevent uneven coating of the paint, the surface which was the lower surface side in the previous drying step (3) is dried as the upper surface side.
（６）乾燥後常温に冷却し、圧粉磁心が完成する。(6) After drying, the powder magnetic core is completed by cooling to room temperature.
2.防錆剤としてソルビタンモノオレエートを使用した場
合の処理例。2. Example of processing when sorbitan monooleate is used as a rust preventive agent.
（１）先ず、処理に先立ってソルビタンモノオレエート
を等重量のアセトンで希釈する。(1) First, sorbitan monooleate is diluted with an equal weight of acetone prior to treatment.
（２）次に、第４図に示す如く前記加熱硬化後の成形体
１をバスケット２等を用いてソルビタンモノオレエート
の希釈液４中に約１分間浸漬する。(2) Next, as shown in FIG. 4, the heat-cured molded body 1 is immersed in a sorbitan monooleate diluent 4 for about 1 minute using a basket 2 or the like.
（３）浸漬後の成形体１を取り出し、60℃の温度で１時
間放置し、乾燥させる。(3) The molded body 1 after the immersion is taken out, left at 60 ° C. for 1 hour and dried.
（４）乾燥後常温に冷却し、圧粉磁心が完成する。(4) After drying, the powder magnetic core is completed by cooling to room temperature.
以上、圧粉磁心成形後の防錆処理の具体例を２例示し
たが、成形後の防錆処理としては、この他、真空容器内
で成形体を脱気した後、防錆剤溶液を真空容器内に満た
し、成形体を防錆剤溶液中に浸漬して含浸する真空含浸
法を用いることもできる。As mentioned above, two specific examples of the rust-preventing treatment after the molding of the dust core have been exemplified. In addition to this, as the rust-preventing treatment after the molding, after degassing the molded body in the vacuum container, the rust preventive agent solution is vacuumed. It is also possible to use a vacuum impregnation method in which the container is filled and the molded product is immersed in a rust preventive agent solution for impregnation.
この、真空含浸法により、成形体に防錆剤を含浸した
場合には、防錆剤が成形体の表面のみならず内部の空隙
内にまで入り込むことができ、防錆能力を依り向上する
ことができる。When the molded body is impregnated with a rust preventive agent by this vacuum impregnation method, the rust preventive agent can penetrate not only into the surface of the molded body but also into the internal voids, thereby improving the rust preventive ability. You can
さて、第１図に示す製造工程によって製作され防錆処
理が施された本発明による圧粉磁心と、成形後防錆油に
浸漬した圧粉磁心と、防錆処理を施さない圧粉磁心とに
ついて、温度60℃，湿度90％，放置時間200時間の環境
条件の下で耐湿試験を行なったところ、次の結果を得
た。Now, the dust core according to the present invention manufactured by the manufacturing process shown in FIG. 1 and subjected to the rust prevention treatment, the dust core immersed in the rust prevention oil after molding, and the dust core not subjected to the rust prevention treatment The following results were obtained when a humidity resistance test was conducted under the environmental conditions of temperature 60 ° C., humidity 90%, and standing time 200 hours.
この結果から明らかなように、第１図に示した製造工
程により製作された本発明による圧粉磁心においては、
高温高湿度の環境下においても発錆せず、防錆能力が優
れていることが確認された。 As is clear from this result, in the dust core according to the present invention manufactured by the manufacturing process shown in FIG.
It was confirmed that even in an environment of high temperature and high humidity, it does not rust and has excellent rust prevention ability.
第２図は、本発明との比較例であって圧粉磁心の別の
製造工程例を示し、防錆処理を磁性粉自体に施した時の
例を示す。FIG. 2 is a comparative example of the present invention, showing another example of the manufacturing process of the dust core, and showing an example when the magnetic powder itself is subjected to rust prevention treatment.
尚、この例では、磁性粉に還元鉄粉、バインダー樹脂
にエポキシ樹脂を用い、配合比を、還元鉄粉85体積％に
対してエポキシ樹脂15体積％とした場合の例について示
す。In this example, an example is shown in which reduced iron powder is used as the magnetic powder, epoxy resin is used as the binder resin, and the compounding ratio is 85% by volume of the reduced iron powder and 15% by volume of the epoxy resin.
第２図において、先ず、上記配合比の還元鉄粉を秤量
した後（S1）、第５図Ｉに示す如く、還元鉄粉５を容器
７内の防錆液６、例えばベンゾトリアゾール溶液中に浸
漬（S2）。次に、第５図IIに示すように、浸漬により防
錆剤６が塗布された還元鉄粉５をロート８等を用いて取
り出し、第５図IIIに示す如く乾燥し（S3）、還元鉄粉
５の表面に防錆剤の被覆膜を形成する。次に、防錆剤の
被覆膜が形成された還元鉄粉と前記配合比に従って秤量
されたエポキシ樹脂とを撹拌機内に入れて約１時間撹拌
し、均一に混合した後（S5）、金型内に流し込み、圧縮
圧力２トン/cm2で圧縮成形する（S6）。圧縮成形によっ
て形成された成形体は150℃の温度の下で約１時間加熱
処理され硬化される（S7）。そして、加熱硬化後の成形
体は常温に冷却され、圧粉磁心が完成する（S8）。In FIG. 2, first, after the reduced iron powder having the above-mentioned mixing ratio is weighed (S1), the reduced iron powder 5 is placed in a rust preventive liquid 6 in a container 7, for example, a benzotriazole solution, as shown in FIG. 5I. Immersion (S2). Next, as shown in FIG. 5 II, the reduced iron powder 5 coated with the rust preventive agent 6 is taken out by using a funnel 8 or the like, and dried as shown in FIG. 5 III (S3) to obtain reduced iron. A coating film of a rust preventive agent is formed on the surface of the powder 5. Next, the reduced iron powder on which the coating film of the rust preventive agent was formed and the epoxy resin weighed according to the above mixing ratio were put in a stirrer and stirred for about 1 hour to uniformly mix (S5), and then gold. It is poured into a mold and compression molded at a compression pressure of 2 ton / cm 2 (S6). The compact formed by compression molding is heat-treated and cured at a temperature of 150 ° C. for about 1 hour (S7). Then, the heat-cured compact is cooled to room temperature to complete the dust core (S8).
以上、第２図に基づいて磁性粉自体に防錆処理を施し
た場合について示したが、磁性粉に防錆処理を施した場
合、圧縮成形時に金型との擦れが生じた面で防錆剤の被
覆膜が剥離する場合があり、その被覆膜の剥離した面で
錆が発生する場合があるが、成形体内の磁性粉は防錆剤
によって被覆された状態にあるので錆の成形体内部への
進行は阻止される。しかしながら、表面での錆の発生は
圧粉磁心の磁気特性に悪影響を及ぼすため、好ましくな
い。The case where the magnetic powder itself has been subjected to rust-prevention treatment based on FIG. 2 has been described above. The coating film of the coating agent may peel off, and rust may occur on the peeled surface of the coating film.However, since the magnetic powder in the molded body is covered with a rust preventive agent, rust formation Progression into the body is blocked. However, the generation of rust on the surface adversely affects the magnetic characteristics of the dust core, which is not preferable.
従って、本発明では第１図に示したように、加熱硬化
後の成形体に防錆する方法をとる。Therefore, in the present invention, as shown in FIG. 1, a method of preventing corrosion on the molded body after heat curing is adopted.
また、さらに十分な防錆力を得るために、第３図の工
程図（S1）〜（S3）に示すように、磁性粉（例えば還元
鉄粉）に防錆処理を施し、同工程図（S4）〜（S7）に従
って成形体を形成した後、この成形体にさらに防錆剤を
塗布、含浸して防錆処理を施して（S8）〜（S10）、二
重に防錆処理が施された圧粉磁心を形成しても良い。Further, in order to obtain a more sufficient rust preventive power, magnetic powder (for example, reduced iron powder) is subjected to rust preventive treatment as shown in the process charts (S1) to (S3) of FIG. After forming a molded body according to S4) to (S7), apply a rust preventive agent to this molded body and impregnate it to perform rust prevention treatment (S8) to (S10), and then perform double rust prevention treatment. It is also possible to form a compressed dust core.
このように二重に防錆処理が施された圧粉磁心では、
圧粉磁心表面のみならず内部の個々の磁性粉自体にも防
錆被覆がなされているため、圧粉磁心の表面に傷が生じ
たような場合にも防錆能力がほとんど低下しないという
効果を奏する。In this way, in the dust core that has been subjected to double rust prevention treatment,
Since the rustproof coating is applied not only to the surface of the dust core but also to the individual magnetic powders inside, the effect that the rustproof ability hardly decreases even if scratches occur on the surface of the dust core Play.
以上、第１図乃至第５図を参照して説明したように、
本発明による圧粉磁心では、鉄若しくは鉄合金よりなる
磁性粉どうしをバインダー樹脂で結合させると共に圧縮
成形した成形体に、防錆剤が含浸され防錆処理が施され
ているため、磁性粉の腐食が防止され、高温多湿の環境
下に置かれた場合にも錆びる虞れが無い。As described above with reference to FIGS. 1 to 5,
In the dust core according to the present invention, the magnetic powder made of iron or an iron alloy is bonded together with the binder resin, and the molded body is compression-molded, and the rust preventive is impregnated to prevent rust treatment. Corrosion is prevented and there is no risk of rusting even when placed in a hot and humid environment.
尚、圧粉磁心の防錆処理に用いる防錆剤として最適な
ものとしては、前述した、アクリル樹脂、ベンゾトリア
ゾール及びその誘導体、ソルビタンモノオレエート及び
その誘導体の他、オレイン酸ナトリウム、エチルアミン
及びその誘導体などがある。Incidentally, as the most suitable rust preventive agent used for the rust preventive treatment of the powder magnetic core, the above-mentioned acrylic resin, benzotriazole and its derivative, sorbitan monooleate and its derivative, sodium oleate, ethylamine and its There are derivatives.
また、第１図乃至第３図に示した例では、磁性粉とし
て、還元鉄粉を用いて圧粉磁心を形成した例について示
したが、鉄系合金を磁性粉として用いた場合にも同様に
実施可能である。In addition, in the example shown in FIGS. 1 to 3, an example in which a dust core is formed by using reduced iron powder as the magnetic powder is shown, but the same applies when an iron-based alloy is used as the magnetic powder. Can be implemented in
例えば、Nd−Fe−Ｂ磁性粉を使用して圧粉磁心を形成
した場合、防錆能力の優れたボンド磁石を形成すること
ができる。For example, when a dust core is formed by using Nd-Fe-B magnetic powder, a bonded magnet having excellent rust preventive ability can be formed.
（発明の効果） 以上説明したように、本発明による圧粉磁心では、鉄
若しくは鉄合金よりなる磁性粉どうしをバインダー樹脂
で結合させると共に圧縮成形した成形体に、防錆剤が含
浸され防錆処理が施されているため、防錆効果を発揮し
磁性粉の腐食が防止され、高温多湿の環境下に置かれた
場合にも錆びる虞が無い。(Effects of the Invention) As described above, in the dust core according to the present invention, the magnetic powder made of iron or iron alloy is bonded with the binder resin and the molded body is compression-molded and the rust preventive is impregnated to prevent rust. Since it has been treated, it has an anticorrosive effect, prevents the magnetic powder from corroding, and does not rust even when placed in a hot and humid environment.
また、本発明による圧粉磁心では、表面のみならず内
部の空隙内にも防錆剤が含浸されているため、発錆の原
因となる空隙内への水の侵入を未然に防止することがで
きる。Further, in the dust core according to the present invention, since the rust preventive agent is impregnated not only in the surface but also in the voids inside, it is possible to prevent water from entering the voids that cause rusting. it can.
したがって、本発明によれば、防錆能力、耐久性に優
れ、発錆による磁気特性の劣化も防止された圧粉磁心を
提供することができる。Therefore, according to the present invention, it is possible to provide a dust core having excellent rust prevention ability and durability, and preventing deterioration of magnetic characteristics due to rusting.
第１図は本発明による圧粉磁心の製造工程の一例を示す
工程図、第２図は本発明との比較例であって圧粉磁心の
製造工程の別の例を示す工程図、第３図は本発明による
圧粉磁心の製造工程の別の例を示す工程図、第４図は成
形体へ防錆剤を塗布、含浸する際に用いられる浸漬法に
よる防錆処理方法の説明図、第５図は磁性粉に防錆剤を
被覆する際に用いられる防錆処理方法の説明図である。 １……成形体、２……バスケット、３……浸漬用タン
ク、4,6……防錆剤、５……磁性粉、７……浸漬用容
器、８……ロート。FIG. 1 is a process diagram showing an example of a manufacturing process of a dust core according to the present invention, and FIG. 2 is a process diagram showing another example of a manufacturing process of a dust core, which is a comparative example with the present invention. FIG. 4 is a process diagram showing another example of the process for producing a dust core according to the present invention, and FIG. 4 is an explanatory diagram of a rust preventive treatment method by a dipping method used for coating and impregnating a molded product with a rust preventive agent, FIG. 5 is an explanatory view of a rust preventive treatment method used when the magnetic powder is coated with a rust preventive agent. 1 ... Molded body, 2 ... Basket, 3 ... Immersion tank, 4,6 ... Rust preventive agent, 5 ... Magnetic powder, 7 ... Immersion container, 8 ... Funnel.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−20153（ＪＰ，Ａ) 特開 昭62−174903（ＪＰ，Ａ) 特開 昭62−174904（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-57-20153 (JP, A) JP-A-62-174903 (JP, A) JP-A-62-174904 (JP, A)
Claims (2)
バインダー樹脂で結合させると共に圧縮成形した成形体
に、防錆剤を含浸して防錆処理を施したことを特徴とす
る圧粉磁心。1. A dust core, characterized in that magnetic powders made of iron or iron alloy are bound together by a binder resin and compression molded, and the molded product is impregnated with a rust preventive agent to prevent rusting.
として、 ・アクリル樹脂 ・ベンゾトリアゾール及びその誘導体 ・ソルビタンモノオレエート及びその誘導体 ・オレイン酸ナトリウム ・エチルアミン及びその誘導体 の何れかを用いたことを特徴とする圧粉磁心。2. The dust core according to claim 1, wherein as an anticorrosive agent, any one of an acrylic resin, benzotriazole and its derivative, sorbitan monooleate and its derivative, sodium oleate, ethylamine and its derivative are used. A dust core characterized by being used.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63046041A JP2692834B2 (en) | 1988-02-29 | 1988-02-29 | Dust core |
| US07/313,612 US5160447A (en) | 1988-02-29 | 1989-02-21 | Compressed powder magnetic core and method for fabricating same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63046041A JP2692834B2 (en) | 1988-02-29 | 1988-02-29 | Dust core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01220407A JPH01220407A (en) | 1989-09-04 |
| JP2692834B2 true JP2692834B2 (en) | 1997-12-17 |
Family
ID=12735944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63046041A Expired - Fee Related JP2692834B2 (en) | 1988-02-29 | 1988-02-29 | Dust core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2692834B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2887295B2 (en) * | 1990-07-02 | 1999-04-26 | 株式会社 三協精機製作所 | Rare earth bonded magnet sheet |
| JPH0478106A (en) * | 1990-07-20 | 1992-03-12 | Sankyo Seiki Mfg Co Ltd | Rare earth bonded magnet |
| DE69717718T2 (en) | 1996-05-28 | 2003-11-13 | Hitachi Ltd | Soft magnetic powder composite core made of particles with insulating layers |
| JP4091349B2 (en) * | 2002-06-11 | 2008-05-28 | Ｄｏｗａホールディングス株式会社 | Method for improving weather resistance of rare earth magnet alloys |
| JP4661268B2 (en) * | 2005-02-28 | 2011-03-30 | Ｔｄｋ株式会社 | Surface treatment method |
| US7824324B2 (en) | 2005-07-27 | 2010-11-02 | Neuronetics, Inc. | Magnetic core for medical procedures |
| JP4523620B2 (en) * | 2007-05-30 | 2010-08-11 | Ｄｏｗａホールディングス株式会社 | Rare earth magnet alloy |
| JP6117504B2 (en) * | 2012-10-01 | 2017-04-19 | Ntn株式会社 | Manufacturing method of magnetic core |
| JP2015012273A (en) * | 2013-07-02 | 2015-01-19 | Tdk株式会社 | Dust core and electronic component |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5720153A (en) * | 1980-07-08 | 1982-02-02 | Toshiba Chem Corp | Continuous coil impregnation of small-sized motor and core rust prevention |
| JPS62174903A (en) * | 1986-01-28 | 1987-07-31 | Taiyo Yuden Co Ltd | Anticorrosive treatment of magnetic metal powder for magnetic recording |
-
1988
- 1988-02-29 JP JP63046041A patent/JP2692834B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01220407A (en) | 1989-09-04 |
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