JPH01126146A - Rotor structure of small-sized motor - Google Patents

Rotor structure of small-sized motor

Info

Publication number
JPH01126146A
JPH01126146A JP63265151A JP26515188A JPH01126146A JP H01126146 A JPH01126146 A JP H01126146A JP 63265151 A JP63265151 A JP 63265151A JP 26515188 A JP26515188 A JP 26515188A JP H01126146 A JPH01126146 A JP H01126146A
Authority
JP
Japan
Prior art keywords
rotor
yoke
fixed
hole
rotor shaft
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
Application number
JP63265151A
Other languages
Japanese (ja)
Inventor
Satoshi Hayashi
敏 林
Kazuhiro Fujimori
藤森 一弘
Ryoichi Matsuda
良一 松田
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP63265151A priority Critical patent/JPH01126146A/en
Publication of JPH01126146A publication Critical patent/JPH01126146A/en
Pending legal-status Critical Current

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  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

PURPOSE:To contrive to lighten an apparatus while preventing the precession of a rotor by forming a yoke into a cylinder, in which a central wall having a through hole in the longitudinally central part is formed. CONSTITUTION:The rotor of a PM type stepping motor is formed by fitting a yoke 2 to a rotor shaft 1 and by arrangement of ring-shaped permanent magnets 3, 4 at the outer periphery of said yoke 2. A stator 5 and a fixed coil 6 are arranged at the outer periphery of said rotor. The rotor yoke 2 is formed into a cylinder in which a central wall is formed in the longitudinally central part, a through hole is formed in the central part of said central wall, and the rotor shaft 1 is fitted into and fixed in said through hole. Said yoke is light because it is hollow and the fixed position of the rotor shaft is at the position of the center of gravity of the rotor so that the precession of said rotor is controlled.

Description

【発明の詳細な説明】 本発明は、永久磁石をローターとして用いたPM型ステ
ッピングモータなどの小形モーターのローター構造に関
する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor structure for a small motor such as a PM stepping motor using a permanent magnet as a rotor.

従来の小形モーターの一例として、第1図にPM型ステ
ッピングモーターの概略断面図を示す。
As an example of a conventional small motor, FIG. 1 shows a schematic cross-sectional view of a PM type stepping motor.

1はローター軸であり、2は中心部に貫通孔を有し、こ
の貫通孔にローター軸1を嵌入固定してなる円柱状の継
鉄である。継鉄2の外周部には多極着磁されたリング状
の永久磁石3および4が固定されており、さらに、その
外周部には、エアーギャップを介してステーター5およ
び固定コイル6が配置されている。7はローター軸1を
回転可能に支持する軸受である。
1 is a rotor shaft, and 2 is a cylindrical yoke having a through hole in the center and having the rotor shaft 1 fitted and fixed into the through hole. Multi-pole magnetized ring-shaped permanent magnets 3 and 4 are fixed to the outer periphery of the yoke 2, and a stator 5 and a fixed coil 6 are arranged on the outer periphery via an air gap. ing. 7 is a bearing that rotatably supports the rotor shaft 1.

このようなモーターの性能を向上させるためには、一般
に永久磁石の磁気性能を強くするか、もしくはローター
の慣性モーメントを小さくする必要がある。しかし、第
1図に示すような従来のローター構造では、磁気性能を
強くすることもローターを軽量化して慣性モーメントを
小さくすることも、いずれも限界であり、特に多極着磁
の極数を多くしようとすると、必然的に永久磁石の径を
大きくしなければならず、これと同時に軽量化を実現す
ることは極めて困難であった。
In order to improve the performance of such motors, it is generally necessary to increase the magnetic performance of the permanent magnets or to reduce the moment of inertia of the rotor. However, with the conventional rotor structure shown in Figure 1, there are limits to both increasing magnetic performance and reducing the moment of inertia by reducing the weight of the rotor. If you try to increase the number, you will inevitably have to increase the diameter of the permanent magnet, and it is extremely difficult to achieve weight reduction at the same time.

このような従来の欠点を解決する手段として、第2図に
示すようなローター構造が提案されている。第2図に示
すように、継鉄2は円筒面部分と底面部分とを備えたコ
ツプ状に形成されており、その底面部分の中心部に設け
られた貫通孔に、ローター軸lが嵌入固定されている。
As a means to solve these conventional drawbacks, a rotor structure as shown in FIG. 2 has been proposed. As shown in Fig. 2, the yoke 2 is formed into a pot shape with a cylindrical surface portion and a bottom surface portion, and the rotor shaft l is fitted and fixed into a through hole provided at the center of the bottom surface portion. has been done.

第2図に示すような継鉄を用いることにより、永久磁石
の径にかかわらずローターを軽量化することができ、非
常に慣性モーメントの小さなローターを提供することが
できるが、第2図に示すようなローター構造には以下の
ような欠点がある。
By using a yoke as shown in Fig. 2, the weight of the rotor can be reduced regardless of the diameter of the permanent magnet, and a rotor with a very small moment of inertia can be provided. Such a rotor structure has the following drawbacks.

すなわち、第2図に示すような継鉄の形状では、ロータ
ー軸1が継鉄の一方の端部である底面部分でのみ固定さ
れており、他方の端部すなわち第2図における下端部は
フリーな状態であるため、重量バランスが悪くなり、ロ
ーターを回転させた時にこの下端部が振動しやすく、こ
まが傾いて回転するような、いわゆるすりこぎ運動をし
て、スムーズな回転が得られないという欠点がある。特
にエアーギャップすなわち永久磁石3の外周面とステー
ター5との間の空隙の幅が小さかったり、継鉄が外径に
比べて長手方向の長さがかなり大き(細長い形状だった
りすると、下端部が振動した時に永久磁石3がステータ
5に衝突して永久磁石3が割れたり欠けたりするという
、致命的な問題が発注する可能性が大きくなる。
That is, in the shape of the yoke as shown in Fig. 2, the rotor shaft 1 is fixed only at one end of the yoke, which is the bottom part, and the other end, that is, the lower end in Fig. 2, is free. Because of this condition, the weight balance is poor, and when the rotor rotates, this lower end tends to vibrate, causing a so-called grinding motion in which the top rotates at an angle, making it difficult to rotate smoothly. There is a drawback. In particular, if the air gap, that is, the width of the air gap between the outer circumferential surface of the permanent magnet 3 and the stator 5, is small, or if the length of the yoke in the longitudinal direction is considerably larger than the outer diameter (if the yoke is elongated), the lower end may be When the permanent magnet 3 vibrates, the permanent magnet 3 collides with the stator 5 and the permanent magnet 3 is cracked or chipped, which is a potentially fatal problem.

本発明は、このような欠点を解決するためになされたも
のであり、ローターがすりこぎ運動することがなく、か
つ軽量化が可能となるローター構造を提供するものであ
る。
The present invention has been made to solve these drawbacks, and provides a rotor structure that does not cause the rotor to grind and can be made lighter.

すなわち本発明のローター構造は、継鉄がその長手方向
の中央部に中央壁が形成された円筒状に形成されており
、この中央壁の中心部には貫通孔が形成されていて、こ
の貫通孔にローター軸を嵌入固定したことを特徴とする
ものである。
That is, in the rotor structure of the present invention, the yoke is formed into a cylindrical shape with a central wall formed at the center in the longitudinal direction, and a through hole is formed at the center of the central wall. The feature is that the rotor shaft is fitted and fixed into the hole.

第3図は、本発明の一例を示すPM型ステッピングモー
タの概略断面図であり、1はローター軸、2は本発明に
よる継鉄、3および4は従来と同じように多極着磁され
た永久磁石、5はステーター、6は固定コイル、7は軸
受である。
FIG. 3 is a schematic cross-sectional view of a PM type stepping motor showing an example of the present invention, in which 1 is a rotor shaft, 2 is a yoke according to the present invention, and 3 and 4 are multi-pole magnetized as in the conventional case. A permanent magnet, 5 a stator, 6 a fixed coil, and 7 a bearing.

継鉄2は、円柱の原料を両側の端面から中心部に向かっ
て中ぐり加工することにより、長手方向の中央部に中央
壁が形成された円筒状に形成されている。ローター軸1
は、中央壁の中央部に設けられた貫通孔に嵌入され固定
されている。
The yoke 2 is formed into a cylindrical shape with a center wall formed in the center in the longitudinal direction by boring a cylindrical raw material from both end faces toward the center. Rotor shaft 1
is fitted into and fixed in a through hole provided in the center of the center wall.

本発明による継鉄は、外周壁の肉厚は第2図に示す継鉄
の外周壁の肉厚と同じでよく、中央壁の肉厚も第2図に
示す継鉄の底面部分の肉厚と同じでよいため、第2図に
示す継鉄と同じだけの軽量化が実現できる。一方、第2
図に示す継鉄とは異なり、ローター軸の固定位置が長手
方向の中央部すなわちローグーの重心位置にあるため、
第2図に示す継鉄に比べて、重量バランスが大幅に改善
され、第2図に示すローターのようにすりこぎ運動する
可能性が小さくなり、永久磁石がステーターに衝突して
破損する恐れもほとんどない。
In the yoke according to the present invention, the thickness of the outer circumferential wall may be the same as that of the outer circumferential wall of the yoke shown in FIG. Since it can be the same as the yoke shown in Fig. 2, it is possible to realize the same weight reduction as the yoke shown in Fig. 2. On the other hand, the second
Unlike the yoke shown in the figure, the fixed position of the rotor shaft is at the center of the longitudinal direction, that is, at the center of gravity of the Rogue.
Compared to the yoke shown in Figure 2, the weight balance is greatly improved, reducing the possibility of grinding motion like the rotor shown in Figure 2, and the risk of permanent magnets colliding with the stator and being damaged. rare.

以上述べた如く、本発明によれば、ローターの軽量化を
実現すると同時に、回転振動が少なくスムーズな回転が
得られるローターを提供することができ、小形モーター
の性能を向上させるうえで多大の効果を有するものであ
る。
As described above, according to the present invention, it is possible to reduce the weight of the rotor and at the same time provide a rotor that provides smooth rotation with little rotational vibration, which has a great effect on improving the performance of small motors. It has the following.

なお、これまでの説明ではPM型ステッピングモーター
を例にとって説明したが、もちろん本発明はこれに限ら
れるものではな(、永久磁石をローターとして用いる小
形モーターであれば、同様の効果が得られるものである
Although the explanation so far has been given using a PM type stepping motor as an example, the present invention is of course not limited to this (the same effect can be obtained with any small motor using a permanent magnet as a rotor It is.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図および第2図は、従来のPM型ステッピングモー
ターの概略断面図。 第3図は、本発明の一例を示すPM型ステッピングモー
ターの概略断面図。 1・・・・・・ローター軸 2・・・・・・継鉄 3.4・・・・・・永久磁石 5・・・・・・ステーター 6・・・・・・固定コイル 7・・・・・・軸受 以  上 代理人  鈴木喜三部(他1名) 才イri 第3q
1 and 2 are schematic cross-sectional views of a conventional PM type stepping motor. FIG. 3 is a schematic sectional view of a PM type stepping motor showing an example of the present invention. 1...Rotor shaft 2...Yoke 3.4...Permanent magnet 5...Stator 6...Fixed coil 7... ... Bearing agent and above Kizobe Suzuki (and 1 other person) Saiiri 3rd q

Claims (1)

【特許請求の範囲】[Claims] ¥ローター軸に固定された継鉄の外周部に永久磁石を固
定してなる小形モーターのローター構造において、前記
継鉄は長手方向の中央部に貫通孔を有する中央壁が形成
された円筒状に形成されており、前記貫通孔に前記ロー
ター軸が嵌入され固定されていることを特徴とする小形
モーターのローター構造。¥
In the rotor structure of a small motor in which a permanent magnet is fixed to the outer periphery of a yoke fixed to the rotor shaft, the yoke has a cylindrical shape with a central wall having a through hole in the center in the longitudinal direction. A rotor structure for a small motor, characterized in that the rotor shaft is fitted into and fixed in the through hole. ¥
JP63265151A 1988-10-20 1988-10-20 Rotor structure of small-sized motor Pending JPH01126146A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63265151A JPH01126146A (en) 1988-10-20 1988-10-20 Rotor structure of small-sized motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63265151A JPH01126146A (en) 1988-10-20 1988-10-20 Rotor structure of small-sized motor

Publications (1)

Publication Number Publication Date
JPH01126146A true JPH01126146A (en) 1989-05-18

Family

ID=17413341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63265151A Pending JPH01126146A (en) 1988-10-20 1988-10-20 Rotor structure of small-sized motor

Country Status (1)

Country Link
JP (1) JPH01126146A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005113A1 (en) * 1996-07-26 1998-02-05 Nippon Seiki Co., Ltd. Stepping motor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5841073B2 (en) * 1973-04-23 1983-09-09 カンガル−・プロダクツ・コムパニ− mobile phone golf cart

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5841073B2 (en) * 1973-04-23 1983-09-09 カンガル−・プロダクツ・コムパニ− mobile phone golf cart

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005113A1 (en) * 1996-07-26 1998-02-05 Nippon Seiki Co., Ltd. Stepping motor
US6031305A (en) * 1996-07-26 2000-02-29 Nippon Seiki Co., Ltd. Stepping motor with rotor and stator having related axial width

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