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JPH0324142B2 - - Google Patents
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JPH0324142B2 - - Google Patents

Info

Publication number
JPH0324142B2
JPH0324142B2 JP60157325A JP15732585A JPH0324142B2 JP H0324142 B2 JPH0324142 B2 JP H0324142B2 JP 60157325 A JP60157325 A JP 60157325A JP 15732585 A JP15732585 A JP 15732585A JP H0324142 B2 JPH0324142 B2 JP H0324142B2
Authority
JP
Japan
Prior art keywords
cover case
iron
fiber
steel
case according
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
Application number
JP60157325A
Other languages
Japanese (ja)
Other versions
JPS6218099A (en
Inventor
Yasuo Kishida
Tetsuo Nishikawa
Nobuo Izawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kanebo Ltd
Original Assignee
Kanebo Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kanebo Ltd filed Critical Kanebo Ltd
Priority to JP15732585A priority Critical patent/JPS6218099A/en
Publication of JPS6218099A publication Critical patent/JPS6218099A/en
Publication of JPH0324142B2 publication Critical patent/JPH0324142B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Casings For Electric Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Inorganic Fibers (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Frames (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

(産業上の利用分野) 本発明はステツピングモーター用カバーケース
に関するもので、詳しくはフロツピーデイスク、
ハードデイスク等の駆動用ステツピングモーター
に好適な優れた磁気シールド性を有する樹脂製の
カバーケースの関するものである。 (従来の技術) 近年、OA機器の急速な普及に伴い、フロツピ
ーデイスク、ハードデイスク、プリンタ等の駆動
用モーターとしてステツピングモーターが多用さ
れるようになつてきた。 ステツピングモーターの構造は、回転子のタイ
プによつて、パーマネントマグネツト形、バリア
ブルレラクタンス形、及び、ハイブリツド形とに
分類されるが、何れも磁気を利用して回転子の駆
動を行う。 一方、回転子に直結したモーターシヤフトによ
つて駆動されるフロツピーデイスクやハードデイ
スクも又、磁気を利用した情報記録媒体であり、
不要磁気による記録情報の脱落等のトラブルが起
こり得る。 この不要磁気の最大の発生源として、ステツピ
ングモーター自体が挙げられる。 従つて、フロツピーデイスクやハードデイスク
等の磁気記録媒体の駆動用としてステツピングモ
ーターを使用する場合には、モーターのカバーケ
ースに磁気シールド性に優れた素材を用いる必要
がある。 多くの場合、この素材として、電磁純鉄が使用
され、鍛造、又は、粉末焼結により成形される
((株)工業調査会編、メカトロブツクス、
1984.2.27、P40〜45)。 (発明が解決しようとする問題点) 現在、ステツピングモーターへの要求として、
微少ステツプ化、高効率化と共に、小形軽量化が
挙げられている。 微少ステツプ化、高効率化に対しては構造面か
らの対策が最も有効であり、ハイブリツド形が適
している。 一方、小形軽量化に関しては、カバーケース素
材の影響が大であるが、磁気シールド性を要求さ
れるとこから、かなりの制約を受けている。即
ち、電磁純鉄等の金属を使用することから軽量化
には不利であり、更に、鍛造、或いは、粉末焼結
という成形法を採ることから、デザイン面からも
小形化が困難である。 (問題点を解決するための手段) 本発明者らは、かゝる従来技術の欠点を改良す
べく鋭意研究した結果、本発明を達成した。 即ち、本発明は、鉄繊維を配合した熱可塑性樹
脂を射出成形してなるステツピングモーター用カ
バーケースである。 以下、本発明を詳細に説明する。 本発明に使用する鉄繊維とは鉄分を含有する金
属繊維のことであり、例えば、純鉄、硅素鋼、コ
バルト鋼、パーマロイ、クロム鋼、マンガン鋼、
モリブデン鋼、バナジウム鋼、チタニウム鋼、ス
テンレス鋼、低炭素鋼、ニオブーバナジウム鋼等
の1種、又は、2種以上からなる金属繊維が挙げ
られるが特に純鉄、硅素鋼、コバルト鋼、パーマ
ロイ、ステンレス鋼からなる金属繊維が好まし
い。 又、鉄繊維が非晶質であることは更に好まし
い。 本発明に使用する鉄繊維の製造法としては、例
えば、伸線加工法、溶融紡糸法、びびり振動切削
加工法、スチールウールの製造に用いられる線材
切削加工法、箔からのスリツト加工法等が挙げら
れる。 鉄繊維の形状は特に制限を受けないが、好まし
くは繊維径5〜100μm、繊維長0.5〜5mmのもの
を使用する。 鉄繊維の配合量は、溶融流動性と磁気シールド
性を有する範囲ならば特に制限されないが、好ま
しくは熱可塑性樹脂100重量部に対して、100〜
500重量部とする。又、鉄繊維以外に、非鉄金属
繊維、或いは、フレーク状、粒状、粉末状の導電
性フイラーを併用することも出来る。 本発明に使用する熱可塑性樹脂としては溶融流
動性を有し、射出成形加工出来るものであれば特
に制限されないが、ポリアミド、ポリエステル、
ポリカーボネート、ポリオレフイン、ポリフエニ
レンオキサイド、ポリフエニレンサルフアイドが
好ましい。 本発明にかゝるステツピングモーター用カバー
ケースの製造法としてはカバーケースに射出成形
加工される迄の任意の段階で、鉄繊維と熱可塑性
樹脂が均一に混練されていればよい。例えば、所
定割合の鉄繊維と熱可塑性樹脂とを、単軸押出
機、或いは、多軸押出機を用いて溶融混練してペ
レツトを製造した後、射出成形加工してもよく、
又、鉄繊維と熱可塑性樹脂とを直接混練射出成形
してもよい。 又、得られたカバーケースに対し、アニール処
理や調湿処理を施すことは、寸法安定性向上のた
めに好ましい。 以下、実施例を用いて、本発明の更に詳細な説
明を行う。 実施例 1 ナイロン6樹脂(カネボウ合繊(株)製MC112)
100重量部に対し、びびり振動切削法による繊維
径50μm、繊維長8mm低炭素鋼繊維((株)神戸鋳鉄
所製、S15C、50×3)300重量部を配合し、2軸
混練機を用いて溶融混練し、ペレツトを得た。次
いで、得られたペレツトを用いて、通常、実施さ
れているナイロン6樹脂の射出成形条件で、ハイ
ブリツド形ステツピングモーターに使用されてい
る電磁純鉄製のカバーケースと同寸法のカバーケ
ースを成形した。 得られたカバーケースをステツピングモーター
に実装し、出力軸側の漏洩磁束の測定を行つた。 結果を表−1に示す。尚、表−1には電磁純
鉄、及び、アルミニウム製のカバーケースを実装
した場合の測定結果も併記した。
(Field of Industrial Application) The present invention relates to a cover case for a stepping motor.
The present invention relates to a cover case made of resin and having excellent magnetic shielding properties suitable for stepping motors for driving hard disk drives and the like. (Prior Art) In recent years, with the rapid spread of office equipment, stepping motors have come into widespread use as driving motors for floppy disks, hard disks, printers, and the like. The structure of stepping motors is classified into permanent magnet type, variable reluctance type, and hybrid type depending on the type of rotor, and all of them use magnetism to drive the rotor. On the other hand, floppy disks and hard disks that are driven by a motor shaft directly connected to a rotor are also information recording media that use magnetism.
Troubles such as recording information falling off due to unnecessary magnetism may occur. The stepping motor itself is the biggest source of this unwanted magnetism. Therefore, when a stepping motor is used to drive a magnetic recording medium such as a floppy disk or a hard disk, it is necessary to use a material with excellent magnetic shielding properties for the cover case of the motor. In many cases, electromagnetic pure iron is used as this material, and is formed by forging or powder sintering (edited by Kogyo Kenkyukai Co., Ltd., Mechatronics).
1984.2.27, P40-45). (Problems to be solved by the invention) Currently, the requirements for stepping motors are as follows:
In addition to smaller steps and higher efficiency, smaller size and lighter weight are mentioned. Structural measures are most effective for miniaturizing steps and increasing efficiency, and a hybrid type is suitable. On the other hand, in terms of size and weight reduction, the cover case material has a large influence, but is subject to considerable restrictions due to the requirement for magnetic shielding properties. That is, since a metal such as electromagnetic pure iron is used, it is disadvantageous to reduce the weight.Furthermore, since a forming method such as forging or powder sintering is used, it is difficult to reduce the size from a design standpoint. (Means for Solving the Problems) The present inventors have achieved the present invention as a result of intensive research to improve the drawbacks of the prior art. That is, the present invention is a cover case for a stepping motor made by injection molding a thermoplastic resin containing iron fibers. The present invention will be explained in detail below. The iron fiber used in the present invention refers to a metal fiber containing iron, such as pure iron, silicon steel, cobalt steel, permalloy, chrome steel, manganese steel,
Examples include metal fibers made of one or more of molybdenum steel, vanadium steel, titanium steel, stainless steel, low carbon steel, niobium vanadium steel, etc., but in particular, pure iron, silicon steel, cobalt steel, permalloy, Metallic fibers made of stainless steel are preferred. Further, it is further preferable that the iron fiber is amorphous. Examples of methods for manufacturing the iron fibers used in the present invention include wire drawing, melt spinning, chatter vibration cutting, wire cutting used in the production of steel wool, and slitting from foil. Can be mentioned. The shape of the iron fibers is not particularly limited, but preferably those with a fiber diameter of 5 to 100 μm and a fiber length of 0.5 to 5 mm are used. The amount of iron fiber blended is not particularly limited as long as it has melt fluidity and magnetic shielding properties, but it is preferably 100 to 100 parts by weight of the thermoplastic resin.
500 parts by weight. Furthermore, in addition to iron fibers, nonferrous metal fibers, or conductive fillers in the form of flakes, particles, or powder can also be used in combination. The thermoplastic resin used in the present invention is not particularly limited as long as it has melt flowability and can be processed by injection molding, but polyamide, polyester,
Preferred are polycarbonate, polyolefin, polyphenylene oxide, and polyphenylene sulfide. The method for manufacturing the cover case for a stepping motor according to the present invention may be such that the iron fibers and the thermoplastic resin are uniformly kneaded at any stage before injection molding into the cover case. For example, a predetermined ratio of iron fibers and thermoplastic resin may be melt-kneaded using a single-screw extruder or a multi-screw extruder to produce pellets, and then injection molding may be performed.
Alternatively, iron fibers and thermoplastic resin may be directly kneaded and injection molded. Further, it is preferable to subject the obtained cover case to annealing treatment or humidity control treatment in order to improve dimensional stability. Hereinafter, the present invention will be explained in more detail using Examples. Example 1 Nylon 6 resin (MC112 manufactured by Kanebo Gosen Co., Ltd.)
To 100 parts by weight, 300 parts by weight of low carbon steel fibers (manufactured by Kobe Cast Iron Co., Ltd., S15C, 50 x 3) with a fiber diameter of 50 μm and a fiber length of 8 mm were blended using a two-shaft kneader. The mixture was melted and kneaded to obtain pellets. Next, using the obtained pellets, a cover case with the same dimensions as the electromagnetic pure iron cover case used in a hybrid stepping motor was molded under the commonly used injection molding conditions for nylon 6 resin. . The obtained cover case was mounted on a stepping motor, and leakage magnetic flux on the output shaft side was measured. The results are shown in Table-1. Table 1 also shows the measurement results when a cover case made of electromagnetic pure iron and aluminum was mounted.

【表】 (発明の効果) 本発明にかゝるステツピングモーター用カバー
ケースは、従来使用されてきた鉄ケースと同等の
磁気シールド性を有し、更に射出成形可能、且つ
軽量という長所を有している。
[Table] (Effects of the Invention) The stepping motor cover case according to the present invention has the same magnetic shielding properties as conventionally used iron cases, and also has the advantages of being injection moldable and lightweight. are doing.

Claims (1)

【特許請求の範囲】 1 鉄繊維を配合した熱可塑性樹脂を射出成形し
てなるステツピングモーター用カバーケース。 2 鉄繊維が純鉄、硅素鋼、コバルト鋼、パーマ
ロイ、ステンレス鋼、低炭素鋼である特許請求の
範囲第1項記載のカバーケース。 3 鉄繊維が非晶質である特許請求の範囲第1項
記載のカバーケース。 4 鉄繊維の繊維径が5〜100μm、繊維長が0.5
〜5mmである特許請求の範囲第1項記載のカバー
ケース。 5 鉄繊維の配合量が、熱可塑性樹脂100重量部
に対し、100〜500重量部である特許請求の範囲第
1項記載のカバーケース。 6 熱可塑性樹脂がポリアミド、ポリエステル、
ポリカーボネート、ポリオレフイン、ポリフエニ
レンオキサイド、ポリフエニレンサルフアイドで
ある特許請求の範囲第1項記載のカバーケース。
[Scope of Claims] 1. A cover case for a stepping motor made of injection molded thermoplastic resin mixed with iron fibers. 2. The cover case according to claim 1, wherein the iron fiber is pure iron, silicon steel, cobalt steel, permalloy, stainless steel, or low carbon steel. 3. The cover case according to claim 1, wherein the iron fiber is amorphous. 4 The fiber diameter of the iron fiber is 5 to 100 μm, and the fiber length is 0.5
The cover case according to claim 1, which has a diameter of 5 mm. 5. The cover case according to claim 1, wherein the amount of iron fiber blended is 100 to 500 parts by weight based on 100 parts by weight of the thermoplastic resin. 6 Thermoplastic resin is polyamide, polyester,
The cover case according to claim 1, which is made of polycarbonate, polyolefin, polyphenylene oxide, or polyphenylene sulfide.
JP15732585A 1985-07-16 1985-07-16 Cover case for stepping motor Granted JPS6218099A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15732585A JPS6218099A (en) 1985-07-16 1985-07-16 Cover case for stepping motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15732585A JPS6218099A (en) 1985-07-16 1985-07-16 Cover case for stepping motor

Publications (2)

Publication Number Publication Date
JPS6218099A JPS6218099A (en) 1987-01-27
JPH0324142B2 true JPH0324142B2 (en) 1991-04-02

Family

ID=15647226

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15732585A Granted JPS6218099A (en) 1985-07-16 1985-07-16 Cover case for stepping motor

Country Status (1)

Country Link
JP (1) JPS6218099A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015186416A (en) * 2014-03-26 2015-10-22 多摩川精機株式会社 resolver coil cover

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0744818B2 (en) * 1986-05-19 1995-05-15 三菱マテリアル株式会社 Stepping motor
JPS63274337A (en) * 1987-04-28 1988-11-11 Canon Inc brushless motor
JPH0752793B2 (en) * 1988-10-28 1995-06-05 三菱電機株式会社 Electronic parts storage case
CN103286908B (en) * 2012-02-24 2015-09-30 比亚迪股份有限公司 A kind of metal-resin integrated molding method and a kind of metal-resin composite

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52137601A (en) * 1976-05-12 1977-11-17 Hitachi Ltd Resin mold stator
JPS53108193A (en) * 1977-03-04 1978-09-20 Hitachi Ltd Undaturated polyester resin molding compound and mold motor using the same
JPS53121102A (en) * 1977-03-31 1978-10-23 Hitachi Ltd Preparing motor of synthetic resin
JPS543306U (en) * 1977-06-10 1979-01-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015186416A (en) * 2014-03-26 2015-10-22 多摩川精機株式会社 resolver coil cover

Also Published As

Publication number Publication date
JPS6218099A (en) 1987-01-27

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