JP3389637B2 - Stepping motor - Google Patents
Stepping motorInfo
- Publication number
- JP3389637B2 JP3389637B2 JP15322893A JP15322893A JP3389637B2 JP 3389637 B2 JP3389637 B2 JP 3389637B2 JP 15322893 A JP15322893 A JP 15322893A JP 15322893 A JP15322893 A JP 15322893A JP 3389637 B2 JP3389637 B2 JP 3389637B2
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- yoke
- stepping motor
- coil
- teeth
- 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
Links
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はビデオカメラやスチルカ
メラ等に用いられる小型ステッピングモータに関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small stepping motor used in video cameras, still cameras and the like.
【０００２】[0002]
【従来の技術】近年、ステッピングモータはカメラ用レ
ンズの駆動等の民生用の新しい用途にも使用され、これ
に伴い小型化，軽量化がなおいっそう要求されている。2. Description of the Related Art In recent years, stepping motors have been used for new consumer applications such as driving a lens for a camera, and accordingly, further miniaturization and weight reduction have been required.
【０００３】以下に従来のステッピングモータについて
説明する。図４は従来のステッピングモータの断面を示
すものである。図４において、シャフト１にラジアル方
向に等ピッチに着磁されたマグネット２が固定され、ロ
ータを構成している。そのマグネット２の外周に対面す
る位置に、外ヨーク４と内ヨーク５がコイル６を挟んで
それぞれ２組がカップ状のフレーム３に収められ、ステ
ータ部が構成している。シャフト１は、フレーム３およ
びブラケット７に圧入固定されている軸受８によって自
在に回転できるようになっている。A conventional stepping motor will be described below. FIG. 4 shows a cross section of a conventional stepping motor. In FIG. 4, magnets 2 magnetized at equal pitches in the radial direction are fixed to a shaft 1 to form a rotor. At a position facing the outer periphery of the magnet 2, two sets of an outer yoke 4 and an inner yoke 5 are housed in a cup-shaped frame 3 with a coil 6 in between, and a stator portion is formed. The shaft 1 can freely rotate by a bearing 8 which is press-fitted and fixed to the frame 3 and the bracket 7.
【０００４】[0004]
【発明が解決しようとする課題】しかし上記の従来の構
造では、マグネット２の外周に対向する外ヨーク４およ
び内ヨーク５の外側にコイル６が設置されているため、
モータの小型化のためにはコイル外径とマグネット外径
を小さくする必要があった。However, in the above-mentioned conventional structure, the coil 6 is installed outside the outer yoke 4 and the inner yoke 5 facing the outer circumference of the magnet 2.
In order to miniaturize the motor, it was necessary to reduce the outer diameter of the coil and the outer diameter of the magnet.
【０００５】コイル外径を小さくした場合、コイル断面
積の減少をきたし、十分な起磁力が得られなくなるため
性能低下が生じていた。When the outer diameter of the coil is reduced, the cross-sectional area of the coil is reduced and a sufficient magnetomotive force cannot be obtained, resulting in deterioration of performance.
【０００６】さらにマグネット外径を小さくした場合、
マグネット外周へ多極着磁を行う際に着磁ピッチが微小
となるため着磁ヨークの磁気飽和によって十分な着磁力
が得られず、高性能のマグネットを使用してもトルクの
低下が生じるという問題点があった。When the outer diameter of the magnet is further reduced,
When the multi-pole magnetizing is performed on the outer circumference of the magnet, the magnetizing pitch becomes very small, so that sufficient magnetic force cannot be obtained due to the magnetic saturation of the magnetizing yoke, and even if a high-performance magnet is used, the torque decreases. There was a problem.
【０００７】たとえば、ステップ角１８度のステッピン
グモータを得ようとした場合、マグネットに１０極の着
磁を行うためマグネット外径４mmが限界であり、その外
側にヨーク，コイルを設置した従来構造ではモータ外径
８mmが小型化の限界であった。For example, when a stepping motor having a step angle of 18 degrees is to be obtained, the magnet has 10 poles, so that the outer diameter of the magnet is limited to 4 mm. The outer diameter of the motor was 8 mm, which was the limit for downsizing.
【０００８】本発明は上記従来の問題を解決し、小型，
軽量で高性能のステッピングモータを提供するものであ
る。The present invention solves the above problems of the prior art,
It provides a lightweight and high-performance stepping motor.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明のステッピングモータは、マグネットとコイ
ルと外ヨークおよび内ヨークを備え、前記コイルを前記
内ヨークと前記外ヨークで挟むように構成されたクロー
ポール型のステッピングモータであって、前記マグネッ
トは外周面および軸方向側面において回転方向等間隔の
ピッチで多極着磁され、前記コイルは前記マグネットの
軸方向側面側に配置され、前記外ヨークの極歯が前記マ
グネットの外周面に、前記内ヨークの極歯が前記マグネ
ットの軸方向側面に対向し、前記マグネット外周面から
前記外ヨークの極歯そして前記内ヨークの極歯を経て前
記マグネットの軸方向側面に至る磁気回路を形成する構
成を有している。In order to achieve the above object, a stepping motor according to the present invention comprises a magnet, a coil, an outer yoke and an inner yoke, and the coil is sandwiched between the inner yoke and the outer yoke. A claw pole type stepping motor configured, wherein the magnet is multi-pole magnetized at pitches at equal intervals in the rotation direction on the outer peripheral surface and the axial side surface, and the coil is arranged on the axial side surface side of the magnet, The pole teeth of the outer yoke face the outer peripheral surface of the magnet, and the pole teeth of the inner yoke face the axial side surface of the magnet.
Through the pole teeth of the outer yoke and the pole teeth of the inner yoke
The magnetic circuit is formed so as to reach the side surface in the axial direction of the magnet .
【００１０】[0010]
【作用】上記構造によれば、コイルをマグネットの側面
に配置することが可能となり、コイル内径を小さくする
ことができるため、モータ外径が小さくなりコイル外径
がさらに小さくなっても十分なコイル断面積が確保でき
る。According to the above structure, the coil can be arranged on the side surface of the magnet, and the inner diameter of the coil can be reduced, so that the outer diameter of the motor is reduced and the outer diameter of the coil is further reduced. The cross-sectional area can be secured.
【００１１】また、マグネットの外周面に対面した外ヨ
ークの外径そのものがモータ外径と同一となるため、着
磁の容易な従来品と同じ外径のマグネットを流用してス
テップ角度を変更することなくモータ外径の小型化がで
きる。Further, since the outer diameter of the outer yoke facing the outer peripheral surface of the magnet is the same as the outer diameter of the motor, the step angle is changed by diverting the magnet having the same outer diameter as the conventional product which is easily magnetized. It is possible to reduce the outer diameter of the motor.
【００１２】[0012]
【実施例】以下、本発明の一実施例について図１および
図２を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【００１３】図１において、フレーム３は内部にコイル
６を挟んで内ヨーク５が挿入結合されており、もう一組
のフレーム，コイル，内ヨークとステップ角だけずれて
背中合わせに結合されている。ロータマグネット２には
シャフト１が固定され、外周には等間隔のピッチでＮ
極，Ｓ極がそれぞれ同数着磁されている。シャフト１は
フレーム３に取りつけられた軸受８によって、自在に回
転できるようになっている。In FIG. 1, a frame 3 has an inner yoke 5 inserted therein with a coil 6 sandwiched therebetween, and is joined back to back with another set of frame, coil and inner yoke displaced by a step angle. The shaft 1 is fixed to the rotor magnet 2, and the outer circumference is N at equal pitches.
The same number of poles and S poles are magnetized. The shaft 1 can freely rotate by a bearing 8 attached to the frame 3.
【００１４】フレーム３の端部には、図２に示すよう
に、櫛歯状にロータマグネット２の着磁ピッチと同じ間
隔で欠き取り部分と極歯Ａ４ａが交互に設けられてい
る。また、内ヨーク５にはロータマグネット２の着磁ピ
ッチと同じ間隔で欠き取り部と花びら状の極歯Ｂ５ａが
交互に設けられている。さらに、フレーム３の端部の極
歯Ａ４ａは内ヨーク５の極歯Ｂ５ａと交互に位置して干
渉しないようになっている。As shown in FIG. 2, at the end of the frame 3, cutout portions and pole teeth A4a are alternately provided in a comb-like shape at the same intervals as the magnetizing pitch of the rotor magnet 2. Further, the inner yoke 5 is provided with cutout portions and petal-shaped pole teeth B5a alternately at the same intervals as the magnetizing pitch of the rotor magnet 2. Further, the pole teeth A4a at the end of the frame 3 are alternately positioned with the pole teeth B5a of the inner yoke 5 so as not to interfere with each other.
【００１５】ここで、フレーム３の端部の極歯Ａ４ａは
マグネット２の外周面の磁束発生部分に対してエアギャ
ップを挟んで向かい合っているので、コイル６で発生さ
れる磁束の向きによって従来例の外ヨーク４の極歯と同
様にマグネット２の外周面との間で吸引反発作用を行
う。Here, since the pole teeth A4a at the end of the frame 3 face the magnetic flux generating portion on the outer peripheral surface of the magnet 2 with an air gap interposed therebetween, the conventional example depends on the direction of the magnetic flux generated by the coil 6. Similar to the pole teeth of the outer yoke 4 of FIG.
【００１６】一方、マグネット２の側面においても外周
面より０．５〜１mmの深さ部分まで外周面と同様に磁束
を発生しており、内ヨーク５の極歯Ｂ５ａはこの側面に
対してエアギャップを挟んで向かい合っているので、コ
イル６で発生される磁束の向きによって従来例の内ヨー
ク５の極歯と同様にマグネット２の側面の間で吸引反発
作用を行う。On the other hand, also on the side surface of the magnet 2, magnetic flux is generated from the outer peripheral surface up to a depth of 0.5 to 1 mm in the same manner as the outer peripheral surface, and the pole teeth B5a of the inner yoke 5 are formed on this side surface by air. Since they face each other across the gap, the attraction and repulsion action is performed between the side surfaces of the magnet 2 in the same manner as the pole teeth of the inner yoke 5 of the conventional example depending on the direction of the magnetic flux generated in the coil 6.
【００１７】このように、従来例とまったく同様のコイ
ル励磁方法でステッピングモータとして動作させること
ができる。As described above, the stepping motor can be operated by the same coil excitation method as in the conventional example.
【００１８】マグネット外周に対しエアギャップを隔て
たヨーク外径がそのままモータ外径となるため、従来構
造に対して同じ外径のマグネットを使用しても本実施例
によれば同じステップ角度のまま、より小型化が可能に
なる。Since the outer diameter of the yoke, which is separated from the outer circumference of the magnet by the air gap, becomes the outer diameter of the motor as it is, even if a magnet having the same outer diameter is used as in the conventional structure, the step angle remains the same according to the present embodiment. , More compact size is possible.
【００１９】図３のようにフレーム３の側面の外周にリ
ブを設けた構造とすれば、フレーム３端部の櫛歯状の部
分からの異物の侵入を防止したり、櫛歯状の部分の極歯
強度の不足を補うことができる。When the ribs are provided on the outer periphery of the side surface of the frame 3 as shown in FIG. 3, foreign matter can be prevented from entering from the comb-teeth portion of the end of the frame 3 and the comb-teeth portion can be prevented. The lack of pole tooth strength can be compensated.
【００２０】[0020]
【発明の効果】以上の実施例から明らかなように、本発
明によれば外ヨークの極歯がマグネットの外周面に、内
ヨークの極歯がマグネット側面に対向するように構成さ
れているため、従来と同じ外径のマグネットを使用して
もさらにモータ外径の小型化とコイル断面積の確保が可
能となるので、小型，軽量で高性能な優れたステッピン
グモータを提供することができる。As is apparent from the above embodiments, according to the present invention, the pole teeth of the outer yoke face the outer peripheral surface of the magnet and the pole teeth of the inner yoke face the side surface of the magnet. Even if a magnet having the same outer diameter as the conventional one is used, the outer diameter of the motor can be further reduced and the coil cross-sectional area can be secured, so that it is possible to provide an excellent stepping motor that is small in size and lightweight and has high performance.
【図１】本発明の一実施例におけるステッピングモータ
の軸方向断面図FIG. 1 is an axial sectional view of a stepping motor according to an embodiment of the present invention.
【図２】本発明の一実施例におけるステッピングモータ
断面図FIG. 2 is a sectional view of a stepping motor according to an embodiment of the present invention.
【図３】本発明の他の実施例におけるステッピングモー
タ断面図FIG. 3 is a sectional view of a stepping motor according to another embodiment of the present invention.
【図４】従来のステッピングモータの軸方向断面図FIG. 4 is an axial sectional view of a conventional stepping motor.
１ シャフト ２ マグネット ３ フレーム ４ 外ヨーク ４ａ 極歯Ａ ５ 内ヨーク ５ａ 極歯Ｂ ６ コイル ７ ブラケット ８ 軸受 1 shaft 2 magnets 3 frames 4 outer yoke 4a pole tooth A 5 Inner yoke 5a pole tooth B 6 coils 7 bracket 8 bearings
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H02K 37/14,37/12 ─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. 7 , DB name) H02K 37 / 14,37 / 12
Claims (5)
ヨークを備え、前記コイルを前記内ヨークと前記外ヨー
クで挟むように構成されたクローポール型のステッピン
グモータであって、前記マグネットは外周面および軸方
向側面において回転方向等間隔のピッチで多極着磁さ
れ、前記コイルは前記マグネットの軸方向側面側に配置
され、前記外ヨークの極歯が前記マグネットの外周面
に、前記内ヨークの極歯が前記マグネットの軸方向側面
に対向し、前記マグネット外周面から前記外ヨークの極
歯そして前記内ヨークの極歯を経て前記マグネットの軸
方向側面に至る磁気回路を形成していることを特徴とす
るステッピングモータ。1. A claw pole type stepping motor comprising a magnet, a coil, an outer yoke and an inner yoke, wherein the coil is sandwiched between the inner yoke and the outer yoke, wherein the magnet has an outer peripheral surface and The poles of the inner yoke are arranged on the outer peripheral surface of the magnet, and the pole teeth of the outer yoke are arranged on the outer peripheral surface of the magnet. The teeth face the axial side surface of the magnet, and the poles of the outer yoke extend from the outer peripheral surface of the magnet.
Through the teeth and the pole teeth of the inner yoke, the shaft of the magnet
A stepping motor characterized by forming a magnetic circuit extending to the side surface in the direction .
端部を櫛歯状に切り欠いて極歯を形成してなる、請求項
１記載のステッピングモータ。2. The stepping motor according to claim 1, wherein the outer yoke is cup-shaped, and its cylindrical end is cut out in a comb-teeth shape to form pole teeth.
端部に外周方向に凸の複数のリブを設けて極歯を形成し
てなる、請求項１記載のステッピングモータ。3. The stepping motor according to claim 1, wherein the outer yoke is cup-shaped, and a plurality of ribs convex in the outer peripheral direction are provided on the cylindrical end portion of the outer yoke to form pole teeth.
載のステッピングモータを使用したビデオカメラ。4. A video camera using the stepping motor according to any one of claims 1 to 3.
載のステッピングモータを使用したスチルカメラ。5. A still camera using the stepping motor according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15322893A JP3389637B2 (en) | 1993-06-24 | 1993-06-24 | Stepping motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15322893A JP3389637B2 (en) | 1993-06-24 | 1993-06-24 | Stepping motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0715939A JPH0715939A (en) | 1995-01-17 |
| JP3389637B2 true JP3389637B2 (en) | 2003-03-24 |
Family
ID=15557860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15322893A Expired - Fee Related JP3389637B2 (en) | 1993-06-24 | 1993-06-24 | Stepping motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3389637B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5831356A (en) * | 1996-04-08 | 1998-11-03 | Canon Kabushiki Kaisha | Compact cylindrical stepping motor and advancing device |
| KR20030046763A (en) * | 2001-12-06 | 2003-06-18 | 삼성전기주식회사 | Stepping motor |
| KR100455262B1 (en) * | 2002-07-10 | 2004-11-06 | 삼성전기주식회사 | Step motor |
| KR100431414B1 (en) * | 2002-07-10 | 2004-05-13 | 삼성전기주식회사 | Step motor |
| KR100512342B1 (en) | 2003-12-09 | 2005-09-05 | 엘지이노텍 주식회사 | Structure of Stepping Motor |
| JP4531463B2 (en) * | 2004-07-05 | 2010-08-25 | 株式会社鷺宮製作所 | Electromagnetic actuator |
| JP4629100B2 (en) * | 2005-04-06 | 2011-02-09 | ミネベアモータ株式会社 | Stepping motor |
| US7639938B2 (en) | 2006-09-08 | 2009-12-29 | Foxconn Technology Co., Ltd. | Two-step focus lens of auto-focusing camera |
-
1993
- 1993-06-24 JP JP15322893A patent/JP3389637B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0715939A (en) | 1995-01-17 |
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