JP3398977B2 - Permanent magnet field rotor - Google Patents
Permanent magnet field rotorInfo
- Publication number
- JP3398977B2 JP3398977B2 JP21084292A JP21084292A JP3398977B2 JP 3398977 B2 JP3398977 B2 JP 3398977B2 JP 21084292 A JP21084292 A JP 21084292A JP 21084292 A JP21084292 A JP 21084292A JP 3398977 B2 JP3398977 B2 JP 3398977B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- yoke
- field rotor
- magnet field
- circumferential
- 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
- Brushless Motors (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、回転界磁形ブラシレス
モータにおける永久磁石界磁ロータの構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a permanent magnet field rotor in a rotating field type brushless motor.
【0002】[0002]
【従来の技術】従来、回転界磁形の小形ブラシレスモー
タは、永久磁石の特性が向上するにともなって、高性能
とくに希土類鉄系の母材からなる永久磁石を使用するよ
うになっている。このように、永久磁石を回転界磁形ブ
ラシレスモータの磁束発生部のロータとして使用する場
合は、図4に示すようにフレーム11の内側に、巻線1
2を巻装した固定子鉄心13を固着し、この固定子鉄心
13の内側に空隙を介して対向させる筒状の永久磁石1
4を、シャフト15と一体あるいは別体にした軟磁性材
のヨーク16の外周に、適当な隙間で嵌合させ、この隙
間内に樹脂接着剤17を流し込んで固着させている。1
8はブラケット、19は軸受である。2. Description of the Related Art Conventionally, small-sized brushless motors of the rotating field type have come to use high-performance permanent magnets made of a base material of a rare earth iron type, as the characteristics of the permanent magnets have been improved. As described above, when the permanent magnet is used as the rotor of the magnetic flux generator of the rotating field type brushless motor, the winding 1 is provided inside the frame 11 as shown in FIG.
Cylindrical permanent magnet 1 in which a stator core 13 wound with 2 is fixed and is opposed to the inside of the stator core 13 with a gap.
4 is fitted to the outer circumference of a soft magnetic material yoke 16 which is integral with or separate from the shaft 15 at an appropriate clearance, and a resin adhesive 17 is poured into this clearance and fixed. 1
Reference numeral 8 is a bracket, and 19 is a bearing.
【0003】また、図5に示すように、シャフト21に
段差22を設けて軸受の役割をするカラー23を一体に
形成させ、このカラー相互間の段差中央部に凹みを設け
て、径方向に厚い樹脂永久磁石24を一体に形成する
か、凹部に接着剤を充填して厚い筒状の永久磁石を接着
させるものが、ロータ用永久磁石として実開平2−49
248号に示されている。Further, as shown in FIG. 5, a step 22 is provided on a shaft 21 to integrally form a collar 23 which plays a role of a bearing, and a recess is provided at a central portion of the step between the collars so that the collar 23 can be radially extended. The one in which the thick resin permanent magnet 24 is integrally formed or the recess is filled with an adhesive to adhere the thick cylindrical permanent magnet is a permanent magnet for a rotor.
No. 248.
【0004】[0004]
【発明が解決しようとする課題】しかるに、図4のよう
に筒状の永久磁石をヨーク外周に嵌合させる場合は、永
久磁石の性能を高くするため希土類鉄系磁石が用いら
れ、径方向の厚さが小さくなっており、この磁石の熱膨
張係数が通常−3×10-6/℃ 〜 3×10-6/℃であ
るのに対し、軟磁性材のヨークの熱膨張係数は11×1
0-6/℃で、両者に大きな差があるため、嵌合隙間が小
さい場合は、運転中の発熱によるヨークの熱膨張によっ
>て、永久磁石に内側から大きな熱応力が加わり、永久
磁石の母材強度が弱いため、磁石にキレツや割れを生じ
るおそれがある。このため永久磁石とヨークとの隙間を
磁気特性の許す範囲で大きくすれば、熱応力の影響によ
る永久磁石の割れを防ぐことができるが、図6に示すよ
うに接着時に、永久磁石14とヨーク16間の樹脂接着
剤17の層に片寄りを生じ、ロータ外周が偏心する欠点
がある。However, when a cylindrical permanent magnet is fitted to the outer periphery of the yoke as shown in FIG. 4, a rare earth iron-based magnet is used to improve the performance of the permanent magnet, and the permanent magnet of the radial direction is used. The thickness of the magnet is small, and the thermal expansion coefficient of this magnet is usually −3 × 10 −6 / ° C. to 3 × 10 −6 / ° C., whereas the thermal expansion coefficient of the soft magnetic material yoke is 11 ×. 1
At 0 -6 / ° C, there is a large difference between the two. Therefore, if the fitting gap is small, heat expansion during operation may cause thermal expansion of the yoke.
> Then, a large thermal stress is applied to the permanent magnet from the inside, and the strength of the base material of the permanent magnet is weak, which may cause cracks or cracks in the magnet. Therefore, if the gap between the permanent magnet and the yoke is increased within the range allowed by the magnetic characteristics, cracking of the permanent magnet due to the effect of thermal stress can be prevented. However, as shown in FIG. There is a defect that the layer of the resin adhesive 17 between 16 is offset and the rotor outer periphery is eccentric.
【0005】また、図5のように、厚さが大きい永久磁
石を小径のカラー外周に取り付けるものでは、永久磁石
の強度が大きいので、熱膨張による影響を考慮する必要
がないが、特性が向上し厚さを小さくした希土類鉄系磁
石を用いる場合は、熱膨張係数の差による影響が大きい
ため、このようにシャフト外周に直接形成させることが
できなかった。Further, in the case where a permanent magnet having a large thickness is attached to the outer periphery of the collar having a small diameter as shown in FIG. 5, since the strength of the permanent magnet is large, it is not necessary to consider the influence of thermal expansion, but the characteristics are improved. However, when a rare earth iron-based magnet having a reduced thickness is used, the effect of the difference in the coefficient of thermal expansion is large, and thus it was not possible to form the magnet directly on the outer circumference of the shaft.
【0006】[0006]
【課題を解決するための手段】本発明は上述の課題を解
決して、厚さの小さい希土類鉄系磁石を、軟磁性材から
なるヨークの外周に、接着剤を介して固着させた永久磁
石界磁ロータを提供するもので、ヨーク外周の両端部付
近に、小幅の周方向突起を設けて筒状の永久磁石を嵌合
させ、永久磁石とヨークとの隙間を、前記突起部を除い
て特性の許す範囲で大きくし、この隙間内に接着硬化後
の伸縮が大きな接着剤を充填して接着固定させてある。SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problems and has a permanent magnet in which a rare earth iron-based magnet having a small thickness is fixed to the outer circumference of a yoke made of a soft magnetic material through an adhesive. Provides a field rotor with both ends on the outer circumference of the yoke
A cylindrical permanent magnet is fitted by providing a small circumferential protrusion in the vicinity.
The clearance between the permanent magnet and the yoke, excluding the protrusions.
The size is increased within the range allowed by the characteristics , and an adhesive having a large expansion and contraction after the adhesive is cured is filled in the gap and fixed by adhesion.
【0007】[0007]
【作用】このため、ヨークと永久磁石との嵌合は、周方
向突起による小さな隙間で保持され、永久磁石とヨーク
との偏心を生じることなく嵌合保持されるとともに、こ
の突起と永久磁石との対向面が小さく、熱膨張の差によ
る応力の影響が少なくなり、その他の大部分の嵌合部は
隙間を大きくしてあるので、熱応力を接着剤層で吸収さ
せることができ、永久磁石のキレツや割れを防止する。Therefore, the fitting between the yoke and the permanent magnet is held with a small gap due to the circumferential projection, and the fitting and holding is performed without causing eccentricity between the permanent magnet and the yoke. Since the opposing surfaces of are small, the influence of stress due to the difference in thermal expansion is small, and most of the other fitting parts have large gaps, the thermal stress can be absorbed by the adhesive layer, and the permanent magnet Prevents cracks and cracks.
【0008】[0008]
【実施例】図1は本発明の実施例を示す側断面図で、1
は筒状の希土類鉄系からなる永久磁石、2は軟磁性材か
らなるシャフト、3はヨークで、一般的には前記シャフ
トと一体に形成している。4はヨーク3の両端部近くに
設けた小幅の周方向突起、5は永久磁石内面とヨークと
の隙間で、周方向突起部分はできるだけ小さくし、その
他の部分は特性上に支障がない程度で大きくしてある。
6は前記隙間5に充填した接着剤で、硬化接着した後の
状態で熱による伸縮率が大きいものを用いている。1 is a side sectional view showing an embodiment of the present invention.
Is a cylindrical permanent magnet made of rare earth iron, 2 is a shaft made of a soft magnetic material, 3 is a yoke, and is generally formed integrally with the shaft. Reference numeral 4 is a small circumferential projection provided near both ends of the yoke 3, 5 is a gap between the inner surface of the permanent magnet and the yoke, and the circumferential projection portion is made as small as possible and other portions do not affect the characteristics. It's big.
Reference numeral 6 denotes an adhesive filled in the gap 5, which has a large expansion / contraction rate due to heat after being hardened and adhered.
【0009】ヨーク3に嵌合させた永久磁石1は、両端
部付近を周方向突起4と僅かな隙間で対向させてヨーク
3と同心に保持され、この周方向突起4の幅が小さいた
め、ヨーク3の膨張による永久磁石1への熱応力の影響
が少なく、他の部分は隙間を大きくしてあるので、熱膨
張差を接着剤層で吸収して永久磁石1に加わる応力をな
くし、キレツや割れを防止する。The permanent magnet 1 fitted to the yoke 3 is held concentrically with the yoke 3 with both ends facing the circumferential projection 4 with a slight gap, and the circumferential projection 4 has a small width. The expansion of the yoke 3 has little influence of thermal stress on the permanent magnet 1, and the other portions have large gaps. Therefore, the difference in thermal expansion is absorbed by the adhesive layer to eliminate the stress applied to the permanent magnet 1, and the cracking is prevented. To prevent cracks.
【0010】また、図の実施例では、周方向突起4を周
方向に連続させているが、図2に示すように周方向突起
に切り欠ぎ部7を設け、あるいは、周方向に複数個設け
た小突起として、永久磁石の内面に対向させるように
し、また、図3のように、周方向に分割して相互に軸方
向の位置を変え、突起による径方向の応力を永久磁石の
周方向や軸方向に分散させることによって、永久磁石と
ヨークとの同心保持を有効に保ちながら熱膨張による応
力を少なくすることができる。In the illustrated embodiment, the circumferential protrusions 4 are continuous in the circumferential direction. However, as shown in FIG. 2, the circumferential protrusions are provided with notches 7 or a plurality of them are provided in the circumferential direction. As the small protrusions provided, they are made to face the inner surface of the permanent magnet, and as shown in FIG. 3, they are divided in the circumferential direction and the axial positions are mutually changed so that the radial stress due to the protrusions is reduced. By dispersing in the axial direction and the axial direction, the stress due to thermal expansion can be reduced while effectively maintaining the concentricity of the permanent magnet and the yoke.
【0011】なお、突起の外周面を図3のように、軸方
向の円弧状になるように湾曲させておけば、応力による
永久磁石への影響をさらに小さくでき、実質的に隙間が
なくなり突起が永久磁石の内面に接触しても、頂点部以
外の応力が円弧面から接着剤層に逃がされ、径方向の応
力による影響をさらに小さくすることができる。If the outer peripheral surface of the projection is curved so as to form an arcuate shape in the axial direction as shown in FIG. 3, the influence of stress on the permanent magnet can be further reduced, and there is substantially no gap. Even when is contacted with the inner surface of the permanent magnet, the stress other than the vertex is released from the arc surface to the adhesive layer, and the influence of the radial stress can be further reduced.
【0012】[0012]
【発明の効果】このように、軟磁性材からなるヨークの
外周面に、永久磁石を嵌合させる部分の少なくとも両端
部付近に小幅の周方向突起を設け、この突起外周に永久
磁石を嵌合させるので、突起部により永久磁石をシャフ
トと同心に保持させることができ、突起部以外の隙間を
大きくして熱膨張による応力の影響を無くし、永久磁石
のキレツや割れを防止できる。また、周方向突起を分割
し、永久磁石内面に対向する部分相互の間に間隙を設け
ることによって、応力の影響を小さくするとともに、突
起両側の接着剤層を連結させて接着強度を向上させ、接
着剤の流入を容易にし得る効果がある。As described above, on the outer peripheral surface of the yoke made of a soft magnetic material, a small width circumferential projection is provided at least near both ends of the portion where the permanent magnet is fitted, and the permanent magnet is fitted on the outer circumference of the projection. As a result, the protrusion can hold the permanent magnet concentrically with the shaft, the gap other than the protrusion can be enlarged to eliminate the influence of stress due to thermal expansion, and the permanent magnet can be prevented from cracking or cracking. In addition, by dividing the circumferential protrusion and providing a gap between the portions facing the inner surface of the permanent magnet, the influence of stress is reduced, and the adhesive layers on both sides of the protrusion are connected to improve the adhesive strength, There is an effect that the inflow of the adhesive can be facilitated.
【図1】本発明の実施例を示す側断面図である。FIG. 1 is a side sectional view showing an embodiment of the present invention.
【図2】他の実施例における正断面図である。FIG. 2 is a front sectional view of another embodiment.
【図3】さらに他の実施例を示す側断面図である。FIG. 3 is a side sectional view showing still another embodiment.
【図4】従来の回転界磁形ブラシレスモータの例を示す
上半部の断面図である。FIG. 4 is a cross-sectional view of an upper half portion showing an example of a conventional rotary field type brushless motor.
【図5】従来のロータの他の例を示す上半部を断面にし
た側面図である。FIG. 5 is a side view showing another example of a conventional rotor with its upper half section taken as a cross section.
【図6】従来の例におけるロータの断面図である。FIG. 6 is a sectional view of a rotor in a conventional example.
1 永久磁石 2 シャフト 3 ヨーク 4 周方向突起 5 隙間 6 接着剤 11 フレーム 12 巻線 13 固定子鉄心 14 永久磁石 15 シャフト 16 ヨーク 17 樹脂接着剤 21 シャフト 22 段差 23 カラー 24 樹脂永久磁石 1 permanent magnet 2 shafts 3 York 4 circumferential projection 5 gap 6 adhesive 11 frames 12 windings 13 Stator core 14 permanent magnet 15 shaft 16 York 17 Resin adhesive 21 shaft 22 steps 23 colors 24 Resin permanent magnet
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平3−49543(JP,A) 特開 平2−7841(JP,A) 特開 昭63−114550(JP,A) 実開 昭50−79906(JP,U) (58)調査した分野(Int.Cl.7,DB名) H02K 1/27 501 H02K 29/00 H02K 21/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-49543 (JP, A) JP-A-2-7841 (JP, A) JP-A 63-114550 (JP, A) Actual development Sho-50- 79906 (JP, U) (58) Fields surveyed (Int.Cl. 7 , DB name) H02K 1/27 501 H02K 29/00 H02K 21/00
Claims (4)
剤を介して筒状の希土類鉄系永久磁石を嵌合固着させた
永久磁石界磁ロータにおいて、永久磁石を嵌合させるヨ
ーク外周部分の両端部付近に、外周面を軸と同心にした
小幅の周方向突起を設け、永久磁石を前記周方向突起に
対向して嵌合させ、ヨークと永久磁石との隙間に接着硬
化後の伸縮率が大きい接着剤を充填したことを特徴とす
る永久磁石界磁ロータ。1. A permanent magnet field rotor in which a cylindrical rare earth iron-based permanent magnet is fitted and fixed to the outer circumference of a yoke made of a soft magnetic material with an adhesive, and a yoke outer peripheral portion to which the permanent magnet is fitted. A small width circumferential projection whose outer peripheral surface is concentric with the shaft is provided in the vicinity of both ends of the, and a permanent magnet is fitted to face the circumferential projection and is bonded to the gap between the yoke and the permanent magnet. A permanent magnet field rotor characterized by being filled with an adhesive having a large expansion and contraction rate after curing.
複数個の突起を形成している請求項1記載の永久磁石界
磁ロータ。2. The permanent magnet field rotor according to claim 1, wherein the circumferential projections form a plurality of circumferentially divided projections.
突起相互を軸方向にずらせている請求項2記載の永久磁
石界磁ロータ。3. The permanent magnet field rotor according to claim 2, wherein the circumferential projections axially shift the circumferentially divided projections from each other.
弧状に形成されている請求項1または2または3記載の
永久磁石界磁ロータ。4. The permanent magnet field rotor according to claim 1, wherein an outer peripheral surface of the circumferential projection is formed in an arcuate shape in the axial direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21084292A JP3398977B2 (en) | 1992-07-14 | 1992-07-14 | Permanent magnet field rotor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21084292A JP3398977B2 (en) | 1992-07-14 | 1992-07-14 | Permanent magnet field rotor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0638417A JPH0638417A (en) | 1994-02-10 |
JP3398977B2 true JP3398977B2 (en) | 2003-04-21 |
Family
ID=16596018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21084292A Expired - Fee Related JP3398977B2 (en) | 1992-07-14 | 1992-07-14 | Permanent magnet field rotor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3398977B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101323522B1 (en) * | 2006-08-14 | 2013-10-29 | 브로제 파르초이크타일레 게엠베하 운트 코. 카게, 뷔르츠부르크 | Rotor for an electric motor |
KR101257949B1 (en) * | 2007-08-03 | 2013-04-23 | 삼성테크윈 주식회사 | Rotor assembly with improved response property, and turbo compressor having the same |
JP5501572B2 (en) * | 2008-04-25 | 2014-05-21 | 株式会社ジェイテクト | Motor rotor and electric power steering device |
JP7264238B2 (en) * | 2019-04-10 | 2023-04-25 | 株式会社Ihi | motor rotor |
-
1992
- 1992-07-14 JP JP21084292A patent/JP3398977B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0638417A (en) | 1994-02-10 |
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