JPS6146153A - Rotor for stepping motor - Google Patents
Rotor for stepping motorInfo
- Publication number
- JPS6146153A JPS6146153A JP59167644A JP16764484A JPS6146153A JP S6146153 A JPS6146153 A JP S6146153A JP 59167644 A JP59167644 A JP 59167644A JP 16764484 A JP16764484 A JP 16764484A JP S6146153 A JPS6146153 A JP S6146153A
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- magnets
- poles
- grooves
- magnetic
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は入力パルスをステップ波形に変換し、このステ
ップ波形で駆動されるステッピングモータのロータ構造
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotor structure of a stepping motor that converts an input pulse into a step waveform and is driven by the step waveform.
従来の技術
ステッピングモータは励磁コイル（ステータ）の内部に
ロータを配設したものであるが、ロータの構造によって
永久磁石型（ロータの外周面に沿って交互に異極を設け
る）と、可変リアクタンス型（ロータを凸極性による磁
気異方性を有する軟磁性体で形成する）と、ノ・イブリ
ット型（前二者を組合わせロータを用いる）とに大別さ
れるが、高効率でしかも小型・軽量であるなどの利点を
有する永久磁石型の使用が増加している。Conventional technology stepping motors have a rotor placed inside an excitation coil (stator), but depending on the rotor structure, there are permanent magnet types (different poles are alternately provided along the outer circumference of the rotor) and variable reactance type stepping motors. They are broadly divided into two types: the rotor (the rotor is made of a soft magnetic material with magnetic anisotropy due to convex polarity) and the no-brit type (the rotor is a combination of the former two).・The use of permanent magnet type magnets, which have advantages such as light weight, is increasing.
一般に、永久磁石型のステッピングモータ（以下ＰＭ型
ステッピングモータという）のロータは、表面に多極着
磁を施した円筒状永久磁石をブツシュを介して回転軸に
固定するか、あるいは上記永久磁石の内側に樹脂製ホル
ダーを射出成形し、ホルダーに回転軸を圧入（もしくは
インサート成形）して組立てられる。円筒状永久磁石と
しては、フェライト磁石（例えば特公昭５７−３８００
５号、特開昭５６−１０７６８号、特開昭５７−１９９
２０５号）、あるいはフェライト系のボンド磁石（特開
昭５７−１３０４０７号。In general, the rotor of a permanent magnet stepping motor (hereinafter referred to as a PM stepping motor) has a cylindrical permanent magnet whose surface is multipole magnetized and is fixed to the rotating shaft via a bushing, or It is assembled by injection molding a resin holder inside and press-fitting (or insert molding) the rotating shaft into the holder. As the cylindrical permanent magnet, ferrite magnets (for example, Japanese Patent Publication No. 57-3800
No. 5, JP-A-56-10768, JP-A-57-199
No. 205), or a ferrite bonded magnet (Japanese Patent Application Laid-open No. 130407/1983).
特公昭５６−５１４８１号）が一般に採用されている。Japanese Patent Publication No. 56-51481) is generally adopted.
発明の解決すべき問題点
上述したように、ＰＭ！ステッピングモータでは、ロー
タ用永久磁石として円筒状永久磁石を用いているが、振
動トルクの低減のために回転磁界の速度を低くすること
が必要であることから、永久磁石の磁極数は増加する傾
向にある。Problems to be Solved by the Invention As mentioned above, PM! In stepping motors, cylindrical permanent magnets are used as permanent magnets for the rotor, but since it is necessary to lower the speed of the rotating magnetic field to reduce vibration torque, the number of magnetic poles of the permanent magnet tends to increase. It is in.
しかし円筒状永久磁石に多極着磁を施す場合、磁極数が
多くなると次の理由により十分な磁気特性が得られなく
なる。表面磁束密度は着磁磁場強度（但し、常用対数の
時）に直線的に比例し、着磁磁場強度は起磁力に比例す
る。ところが磁極数が多くなると、コイルの巻数や線径
を小さくする必要があるので、十分な起磁力が得られな
くなる。However, when a cylindrical permanent magnet is subjected to multi-pole magnetization, if the number of magnetic poles increases, sufficient magnetic properties cannot be obtained for the following reasons. The surface magnetic flux density is linearly proportional to the magnetizing magnetic field strength (when it is a common logarithm), and the magnetizing magnetic field strength is proportional to the magnetomotive force. However, when the number of magnetic poles increases, it is necessary to reduce the number of coil turns and the wire diameter, making it impossible to obtain sufficient magnetomotive force.
ここで着磁可能な磁極数は、磁石寸法によっても異なる
が、例えば磁石外径が３Ｑｉｘφの時は４８極、磁石外
径が４０朋φの時でｌＯＯ極位であり、１００極を越え
る磁極数を得ることは殆ど不可能であった。The number of magnetic poles that can be magnetized here varies depending on the magnet dimensions, but for example, when the magnet outer diameter is 3Qixφ, it is 48 poles, and when the magnet outer diameter is 40 mmφ, it is 100 poles, and there are more than 100 magnetic poles. It was almost impossible to obtain numbers.
問題点を解決するための手段
本発明の目的は、上述した従来技術の問題点を解消し、
磁極数が大で（１００極以上）しかも表面磁束密度の高
いステッピングモータ用ロータヲ提供することである。Means for Solving the Problems The purpose of the present invention is to solve the problems of the prior art described above,
To provide a rotor for a stepping motor having a large number of magnetic poles (100 or more) and a high surface magnetic flux density.
本発明のステッピングモータ用ロータは、円筒状の磁性
コアの外周面に等間隔で複数個の溝を形成し、上記溝の
各々に円周方向に磁化されたブロック状の永久磁石を相
隣る磁極が同極性となるように嵌装し、上記コアの内側
に回転軸を同心状に固着した構成を有している。In the stepping motor rotor of the present invention, a plurality of grooves are formed at equal intervals on the outer peripheral surface of a cylindrical magnetic core, and block-shaped permanent magnets magnetized in the circumferential direction are arranged adjacent to each other in each of the grooves. The magnetic poles are fitted so that they have the same polarity, and the rotating shaft is fixed concentrically inside the core.
作用
本発明のステッピングモータ用ロータにおいては、磁性
コアに設けられた溝の中に互に隣接する磁石間で同極性
の磁極が対向しているため、コアの外周面には見掛上交
互に異極性の磁極が現出することになり、表面に多極着
磁した永久磁石と同等の磁気回路が得られる。しかもブ
ロック状の永久磁石を用いているため、磁石の厚さを変
えることにより、磁極数の調節ができ、薄くすることに
よって１００極以上の磁極を有するロータを充分に得る
ことができる。Function: In the stepping motor rotor of the present invention, since magnetic poles of the same polarity face each other between adjacent magnets in the grooves provided in the magnetic core, there are apparently alternating magnetic poles on the outer peripheral surface of the core. Magnetic poles of different polarity appear, and a magnetic circuit equivalent to that of a permanent magnet whose surface is magnetized with multiple poles is obtained. Moreover, since block-shaped permanent magnets are used, the number of magnetic poles can be adjusted by changing the thickness of the magnet, and by making the magnet thinner, a rotor having 100 or more magnetic poles can be obtained.
実施例 以下本発明の詳細を図面により説明する。。Example The details of the present invention will be explained below with reference to the drawings. .
第１図は本発明の一実施例に係るステッピングモータ用
ロータの正面図、第２図は第１図のＡ部拡大展開図であ
る。FIG. 1 is a front view of a stepping motor rotor according to an embodiment of the present invention, and FIG. 2 is an enlarged development view of section A in FIG. 1.
まず、第１図において、１は磁性体からなる円筒状のコ
アで、非磁性体（Ａｊ、Ｂｓ、プラスチック等）からな
るブツシュ２が嵌装され、該ブツシュの内面には回転軸
３が挿入・固定されている。またコア１の外周面には円
周方向に沿って等間隔に複数個の溝４が形成されている
。溝３の各々にはブロック状の永久磁石５が固着されて
いる。First, in FIG. 1, 1 is a cylindrical core made of a magnetic material, into which a bushing 2 made of a non-magnetic material (Aj, Bs, plastic, etc.) is fitted, and a rotating shaft 3 is inserted into the inner surface of the bushing.・Fixed. Further, a plurality of grooves 4 are formed on the outer peripheral surface of the core 1 at equal intervals along the circumferential direction. A block-shaped permanent magnet 5 is fixed to each of the grooves 3.
次に、３ｇ１図に示すロータの磁気回路を第２図により
説明する。Next, the magnetic circuit of the rotor shown in Fig. 3g1 will be explained with reference to Fig. 2.
同図において、永久磁石５は円周方向に磁化されており
、各永久磁石は同視性磁極同志が対向するように配列さ
れている。従ってロータの外周面には、図中破線で示す
ような磁束線が生じ、コアの凸部表面に見掛上Ｎ、Ｓの
磁極が交互に現出することになる。In the figure, the permanent magnets 5 are magnetized in the circumferential direction, and each permanent magnet is arranged so that isotropic magnetic poles face each other. Therefore, lines of magnetic flux as shown by broken lines in the figure are generated on the outer peripheral surface of the rotor, and apparently N and S magnetic poles appear alternately on the surface of the convex portion of the core.
ここで、第２図においては、ブロック状の永久磁石５を
用いているため、各永久磁石５の厚ｔを薄くすることに
より、１００極以上の磁極数を有するロータが容易に得
られる。永久磁石としては、フェライト磁石に限らずボ
ンド磁石を用いてもよいが、Ｂｒが４０００Ｇ以ヒ、Ｉ
Ｈｃが４００００ｅ以上の磁気特性を有するものが好ま
しい。このような磁気特性であれば、ロータ表面での磁
束密度は高くなり（例えば外径４０１！ＩＩφで７００
Ｇ以上）、高性能のステッピングモータが得られる。Here, in FIG. 2, since block-shaped permanent magnets 5 are used, by reducing the thickness t of each permanent magnet 5, a rotor having 100 or more magnetic poles can be easily obtained. As the permanent magnet, not only ferrite magnets but also bonded magnets may be used.
It is preferable to have magnetic properties with Hc of 40,000e or more. With such magnetic properties, the magnetic flux density on the rotor surface will be high (for example, with an outer diameter of 401!IIφ and 700
G or higher), a high-performance stepping motor can be obtained.
またギャップｇは、磁気特性を高めるためには、できる
だけ小さい方がよい。Further, the gap g is preferably as small as possible in order to improve the magnetic properties.
なお、磁石の固定は、磁石の寸法が小さいため、少量（
数■）の接着剤により容易に行うことができ、生産性の
点でも十分実用性はある。Please note that fixing the magnet requires a small amount (
It can be easily done using several adhesives, and is sufficiently practical in terms of productivity.
具体例
外径４Ｑｔｌｌ’、内径３Ｑｘｘ’、長さ１５關の鋼製
；ア１の内周面にアルミ合金製ブツシュ２を圧入し、さ
らにブツシュ２にＳＵＳ製の回転軸３を圧入し、このコ
アの外周に厚さＱ、６５ ｍ＜ 、高さ３１冨、長さ１
５朋のフェライト磁石（日立金属製ＹＢＭ−２ＢＢ）１
００個を固着して、外径４Ｑｔｎｔｎ□磁極数１００の
ロータ（ギャップｇ ＝ Ｑ、ｌ ｗ ）を製作した。Specifically made of steel with an exception diameter of 4Qtll', an inner diameter of 3Qxx', and a length of 15 mm; an aluminum alloy bushing 2 is press-fitted into the inner peripheral surface of A1, and a SUS rotating shaft 3 is press-fitted into the bushing 2. The outer circumference has a thickness Q, 65 m<, a height of 31 m, and a length of 1
5. Ferrite magnet (YBM-2BB manufactured by Hitachi Metals) 1
A rotor with an outer diameter of 4Qtntn□ and 100 magnetic poles (gap g = Q, lw) was manufactured by fixing 00 pieces.
このロータの表面磁束密度は１００ＯＧであった。The surface magnetic flux density of this rotor was 100OG.
比較のために、外径４０ノ、長さ１５朋のフェライト磁
石（ＹＢＭ−４Ｂ）を用いて磁極数１００のロータを製
作したが、その表面磁束密度は６５０ Ｇであっ〔発明
の効果〕
以上に記述の如く、本発明のステッピングモータ用ロー
タは、１００極を越える磁極数を有しかつ高い表面磁束
密度を有しているため、高性能のステッピングモータを
得ることができる。For comparison, a rotor with 100 magnetic poles was manufactured using ferrite magnets (YBM-4B) with an outer diameter of 40 mm and a length of 15 mm, and its surface magnetic flux density was 650 G. [Effects of the Invention] As described in , since the stepping motor rotor of the present invention has more than 100 magnetic poles and a high surface magnetic flux density, a high-performance stepping motor can be obtained.
第１図は本発明の一実施例に係゛るステッピングモータ
用ロータの正面図、第２図は第１図のＡ部拡大展開図で
ある。
１：コア、３：回転軸、４：溝、５：永久磁石。
第１ 図
＋５１FIG. 1 is a front view of a stepping motor rotor according to an embodiment of the present invention, and FIG. 2 is an enlarged development view of section A in FIG. 1. 1: Core, 3: Rotating shaft, 4: Groove, 5: Permanent magnet. Figure 1 +51
Claims (1)
成し、上記溝の各々に円周方向に磁化されたブロック状
の永久磁石を相隣る磁極が同極性となるように嵌装し、
上記コアの内側に回転軸を同心状に固着したことを特徴
とするステッピングモータ用ロータ。1. A plurality of grooves are formed at equal intervals on the outer peripheral surface of a cylindrical magnetic core, and a block-shaped permanent magnet magnetized in the circumferential direction is placed in each groove so that adjacent magnetic poles have the same polarity. fitted,
A rotor for a stepping motor, characterized in that a rotating shaft is fixed concentrically to the inside of the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59167644A JPS6146153A (en) | 1984-08-10 | 1984-08-10 | Rotor for stepping motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59167644A JPS6146153A (en) | 1984-08-10 | 1984-08-10 | Rotor for stepping motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6146153A true JPS6146153A (en) | 1986-03-06 |
Family
ID=15853585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59167644A Pending JPS6146153A (en) | 1984-08-10 | 1984-08-10 | Rotor for stepping motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6146153A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04200261A (en) * | 1990-11-28 | 1992-07-21 | Shinko Electric Co Ltd | Outer rotor type pulse motor |
| JP2010259309A (en) * | 2008-09-30 | 2010-11-11 | Fuji Electric Holdings Co Ltd | Electromagnetic unit and ring coil motor |
| WO2011076740A1 (en) * | 2009-12-21 | 2011-06-30 | Höganäs Ab (Publ) | Rotor for modulated pole machine |
-
1984
- 1984-08-10 JP JP59167644A patent/JPS6146153A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04200261A (en) * | 1990-11-28 | 1992-07-21 | Shinko Electric Co Ltd | Outer rotor type pulse motor |
| JP2576286B2 (en) * | 1990-11-28 | 1997-01-29 | 神鋼電機株式会社 | Outer rotor type pulse motor |
| JP2010259309A (en) * | 2008-09-30 | 2010-11-11 | Fuji Electric Holdings Co Ltd | Electromagnetic unit and ring coil motor |
| WO2011076740A1 (en) * | 2009-12-21 | 2011-06-30 | Höganäs Ab (Publ) | Rotor for modulated pole machine |
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