JPH07308057A - Permanent magnet type synchronous motor - Google Patents
Permanent magnet type synchronous motorInfo
- Publication number
- JPH07308057A JPH07308057A JP6123095A JP12309594A JPH07308057A JP H07308057 A JPH07308057 A JP H07308057A JP 6123095 A JP6123095 A JP 6123095A JP 12309594 A JP12309594 A JP 12309594A JP H07308057 A JPH07308057 A JP H07308057A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- tooth portion
- tooth
- tip
- circular arc
- 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
- 230000001360 synchronised effect Effects 0.000 title claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract description 6
- 230000004907 flux Effects 0.000 description 4
- 238000005245 sintering Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、マイクロロボットなど
を駆動する超小形で高トルクを発生する永久磁石形同期
電動機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-compact permanent magnet type synchronous motor for driving a microrobot or the like, which generates high torque.
【０００２】[0002]
【従来の技術】従来、永久磁石形同期電動機は、中空円
筒状のヨーク部の内側に電機子巻線によって励磁される
歯部と、歯部の内側に空隙を介して対向する永久磁石か
らなる回転子とを備え、永久磁石は円周方向に複数の極
性の異なる磁極を交互に形成してある。ところで、空隙
長さを一定にして、歯部の先端の円周方向の位置におけ
る空隙磁束密度をほぼ一定しにておくと、コギングトル
クが発生するので、永久磁石の端部の厚さを中央部の厚
さより小さくして、中央部の空隙磁束密度を増やし、両
端部の空隙磁束密度を低減して、歯部の先端と永久磁石
との間の空隙磁束密度が円周方向に正弦波状に分布する
ようにしたものが開示されている（例えば、特開昭６３
−１６２８５３号、特開昭６３−１４０６４４号）。2. Description of the Related Art Conventionally, a permanent magnet type synchronous motor is composed of a tooth portion which is excited by an armature winding inside a hollow cylindrical yoke portion, and a permanent magnet which is opposed to the inside of the tooth portion with a gap. The permanent magnet is provided with a rotor and a plurality of magnetic poles having different polarities are alternately formed in the circumferential direction. By the way, if the air gap magnetic flux density is kept almost constant at the circumferential position of the tip of the tooth with the air gap length kept constant, cogging torque is generated. The air gap magnetic flux density at the center is increased and the air gap magnetic flux density at both ends is reduced to make the air gap magnetic flux density between the tip of the tooth and the permanent magnet into a sinusoidal shape in the circumferential direction. Distributors are disclosed (for example, Japanese Patent Laid-Open No. Sho 63-63).
-162853, JP-A-63-140644).
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記従来技
術では、永久磁石の厚みが変化するので永久磁石の成形
金型が複雑となるが、焼結などの製作工程が必要な永久
磁石の成形金型は形状が複雑になるると、燒結後の寸法
精度を出すのに多くの手間がかかり、製作費が高価とな
るという欠点があった。本発明は、歯部の先端形状を特
定することにより、コギングトルクを低減し、永久磁石
の製作費を安価にすることを目的とするものである。However, in the above-mentioned prior art, the molding die of the permanent magnet is complicated because the thickness of the permanent magnet changes, but the molding die of the permanent magnet that requires a manufacturing process such as sintering is required. When the shape of the mold becomes complicated, it takes a lot of time and effort to obtain the dimensional accuracy after sintering, and the manufacturing cost becomes high. An object of the present invention is to reduce the cogging torque and specify the manufacturing cost of the permanent magnet by specifying the tip shape of the tooth portion.
【０００４】[0004]
【課題を解決するための手段】上記問題を解決するた
め、本発明は、積層鉄心からなる中空円筒状のヨーク部
と前記ヨーク部の内側に突出する複数の歯部と前記歯部
に巻回した電機子コイルとからなるステータと、前記歯
部の先端部に空隙を介して対向し、かつ円周方向に複数
の極性の異なる磁極を交互に形成した円筒状の永久磁石
からなるロータとを備えた永久磁石形同期電動機におい
て、前記歯部の先端部は円弧状に突出するように形成
し、前記円弧の曲率半径ｒを、歯部の幅をＷとしたと
き、０．８Ｗから１．１Ｗの範囲としたものである。In order to solve the above problems, the present invention provides a hollow cylindrical yoke portion made of a laminated iron core, a plurality of tooth portions projecting inward of the yoke portion, and winding around the tooth portions. And a rotor composed of a cylindrical permanent magnet that is opposed to the tip of the tooth portion with a gap and that has a plurality of magnetic poles of different polarities alternately formed in the circumferential direction. In the provided permanent magnet type synchronous motor, the tips of the teeth are formed so as to project in an arc shape, and the radius of curvature r of the arc is 0.8 W to 1. W when the width of the teeth is W. The range is 1 W.
【０００５】[0005]
【作用】上記手段により、永久磁石に対向する歯部の先
端部を円弧状に突出するように形成し、永久磁石を円筒
状に形成するので、歯部と永久磁石の間のパーミアンス
分布を正弦波状に分布させ、コギングトルクを低減で
き、かつ永久磁石の成形金型が簡単になり、製作費用の
コストを低減できる。With the above means, the tip of the tooth portion facing the permanent magnet is formed so as to project in an arc shape, and the permanent magnet is formed into a cylindrical shape. Therefore, the permeance distribution between the tooth portion and the permanent magnet is sinusoidal. The wavy distribution can reduce the cogging torque, the molding die for the permanent magnet can be simplified, and the manufacturing cost can be reduced.
【０００６】[0006]
【実施例】以下、本発明を図に示す実施例について説明
する。図１は本発明の実施例を示す側断面図である。図
において、中空円筒状のヨーク部１の内側に突出する２
個の歯部２を設けた積層鉄心からなるステータ３を形成
し、歯部２の先端部２１は突出する方向に円弧状に形成
してある。歯部２には電機子コイル４を巻回してある。
歯部２の内側には、円筒状の永久磁石５からなるロータ
６を歯部２の先端に空隙Ｇを介して対向するように回転
自在に支持し、円周方向に複数の極性の異なる磁極を交
互に形成してある。円筒状の永久磁石５と、永久磁石５
に向かって突出するように円弧状に形成した歯部２の先
端部２１との間には、円周方向に沿ってほぼ正弦波状に
変化する空隙Ｇが形成される。ここで、歯部２の先端部
２１の形状を決定する場合について説明する。磁界解析
によって先端部２１の曲率半径ｒと歯部２の幅Ｗとの比
率を変えた時の空隙のパーミアンス分布を調べた。すな
わち、歯部２の先端部２１の円弧の曲率半径ｒを、歯部
２の幅をＷとしたとき、０．１Ｗピッチで０．５Ｗから
１．５Ｗの範囲のものを作成して、先端部がロータ外周
と均一な空隙を備えた場合を１としたときの空隙Ｇにお
けるパーミアンス分布の高調波成分の割合を調べた。そ
の結果、図２に示すように、０．８Ｗ≦ｒ≦１．１Ｗの
範囲で高調波成分の割合が小さくなっており、この範囲
で最もコギングトルクを低減できることを示している。
したがって、先端部２１の円弧の曲率半径ｒを、歯部の
幅をＷとしたとき、０．８Ｗから１．１Ｗの範囲とすれ
ばよい。なお、永久磁石５は円筒状に形成してあるの
で、永久磁石の成形金型が簡単となり、製作費が極めて
安価となる。なお、歯部２の形状は円弧状に形成する
が、ヨーク部１および歯部２を一体に積層鉄心で構成し
てあるのでプレス金型の製作は容易であり、プレス加工
では寸法精度を高めるために多くの手間を必要としない
ので問題はない。また、本実施例では、歯部２の数を４
個としたが、６個、８個など２個以上の複数個に増して
もよく、磁極数も歯部の数に応じて増やしてもよい。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of the present invention. In the drawing, 2 which protrudes inside the hollow cylindrical yoke portion 1
A stator 3 formed of a laminated iron core provided with individual tooth portions 2 is formed, and a tip portion 21 of the tooth portion 2 is formed in an arc shape in a protruding direction. An armature coil 4 is wound around the tooth portion 2.
Inside the tooth portion 2, a rotor 6 composed of a cylindrical permanent magnet 5 is rotatably supported so as to face the tip of the tooth portion 2 via a gap G, and a plurality of magnetic poles having different polarities in the circumferential direction. Are formed alternately. Cylindrical permanent magnet 5 and permanent magnet 5
A gap G that changes in a substantially sinusoidal shape along the circumferential direction is formed between the end portion 21 of the tooth portion 2 that is formed in an arc shape so as to project toward. Here, a case where the shape of the tip portion 21 of the tooth portion 2 is determined will be described. The permeance distribution of the air gap when the ratio of the radius of curvature r of the tip portion 21 to the width W of the tooth portion 2 was changed was examined by magnetic field analysis. That is, when the radius of curvature r of the arc of the tip portion 21 of the tooth portion 2 is W, where the width of the tooth portion 2 is W, one having a range of 0.5 W to 1.5 W at 0.1 W pitch is created, and The ratio of the harmonic component of the permeance distribution in the air gap G, where the case where the part has a uniform air gap with the outer circumference of the rotor is 1, was examined. As a result, as shown in FIG. 2, the proportion of harmonic components is small in the range of 0.8 W ≦ r ≦ 1.1 W, which shows that the cogging torque can be reduced most in this range.
Therefore, the radius of curvature r of the arc of the tip portion 21 may be in the range of 0.8 W to 1.1 W, where W is the width of the tooth portion. Since the permanent magnet 5 is formed into a cylindrical shape, the molding die for the permanent magnet is simple and the manufacturing cost is extremely low. The tooth portion 2 is formed in an arc shape, but since the yoke portion 1 and the tooth portion 2 are integrally formed of a laminated iron core, the press die can be easily manufactured, and the dimensional accuracy is increased by the press working. There is no problem because it does not require much effort. In addition, in the present embodiment, the number of tooth portions 2 is 4
However, the number may be increased to two or more such as six and eight, and the number of magnetic poles may be increased according to the number of teeth.
【０００７】[0007]
【発明の効果】以上述べたように、本発明によれば、永
久磁石を円筒状に形成し、永久磁石に対向する歯部の先
端部を円弧状に形成して、歯部と永久磁石の間のパーミ
アンス分布を正弦波状に分布するようにしてあるので、
コギングトルクを少さくすることができる。また、永久
磁石の形状および成形金型が簡単になり、安価な永久磁
石形同期電動機を提供できる効果がある。As described above, according to the present invention, the permanent magnet is formed in a cylindrical shape, and the tip of the tooth portion facing the permanent magnet is formed in an arc shape so that the tooth portion and the permanent magnet can be formed. Since the permeance distribution between is distributed in a sinusoidal shape,
The cogging torque can be reduced. Further, the shape of the permanent magnet and the molding die are simplified, and there is an effect that an inexpensive permanent magnet type synchronous motor can be provided.
【図１】本発明の実施例を示す正断面図である。FIG. 1 is a front sectional view showing an embodiment of the present invention.
【図２】本発明の実施例のパーミアンス分布を示す説明
図である。FIG. 2 is an explanatory diagram showing a permeance distribution according to the embodiment of this invention.
１ ヨーク部、２ 歯部、２１ 先端部、３ ステー
タ、４ 電機子コイル、５ 永久磁石、６ ロータ1 yoke part, 2 tooth part, 21 tip part, 3 stator, 4 armature coil, 5 permanent magnet, 6 rotor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浅沼 毅 福岡県北九州市八幡西区黒崎城石２番１号 株式会社安川電機内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Asanuma 2-1, Kurosaki Shiroishi, Hachimansai-ku, Kitakyushu, Fukuoka Prefecture Yasukawa Electric Co., Ltd.
Claims (1)
と前記ヨーク部の内側に突出する複数の歯部と前記歯部
に巻回した電機子コイルとからなるステータと、前記歯
部の先端部に空隙を介して対向し、かつ円周方向に複数
の極性の異なる磁極を交互に形成した円筒状の永久磁石
からなるロータとを備えた永久磁石形同期電動機におい
て、前記歯部の先端部は円弧状に突出するように形成
し、前記円弧の曲率半径ｒを、歯部の幅をＷとしたと
き、０．８Ｗから１．１Ｗの範囲としたことを特徴とす
る永久磁石形同期電動機。1. A stator comprising a hollow cylindrical yoke portion made of a laminated iron core, a plurality of tooth portions projecting inward of the yoke portion, and an armature coil wound around the tooth portion, and a tip of the tooth portion. A permanent magnet synchronous motor having a rotor made of a cylindrical permanent magnet having a plurality of magnetic poles having different polarities alternately formed in the circumferential direction, the distal end portion of the tooth portion Is formed so as to project in an arc shape, and the radius of curvature r of the arc is in the range of 0.8 W to 1.1 W, where W is the width of the tooth portion. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6123095A JPH07308057A (en) | 1994-05-11 | 1994-05-11 | Permanent magnet type synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6123095A JPH07308057A (en) | 1994-05-11 | 1994-05-11 | Permanent magnet type synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07308057A true JPH07308057A (en) | 1995-11-21 |
Family
ID=14852084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6123095A Pending JPH07308057A (en) | 1994-05-11 | 1994-05-11 | Permanent magnet type synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07308057A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982425A3 (en) * | 1998-08-17 | 2000-03-08 | Miele & Cie. GmbH & Co. | Laundry treatment apparatus |
| WO2004088819A1 (en) * | 2003-03-31 | 2004-10-14 | Robert Bosch Gmbh | Permanent magnetically excited electric machine |
| WO2005043723A1 (en) * | 2003-10-22 | 2005-05-12 | Emerson Electric Co. | Brushless permanent magnet motor with high power density, low cogging and low vibration |
| EP1793482A1 (en) | 2005-12-02 | 2007-06-06 | Moteurs Leroy-Somer | Rotary electric machine with reduced torque ripple |
| JP2007209186A (en) * | 2006-02-06 | 2007-08-16 | Mitsubishi Electric Corp | Synchronous motor and manufacturing method therefor |
| JP2009089546A (en) * | 2007-10-02 | 2009-04-23 | Hitachi Appliances Inc | Permanent magnet type rotating electric machine for washing machine |
| JP2012527210A (en) * | 2009-05-11 | 2012-11-01 | ムービング マグネット テクノロジーズ | Three-phase motor with low detent torque |
| CN106505764A (en) * | 2016-11-18 | 2017-03-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure, motor and compressor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60121949A (en) * | 1983-12-05 | 1985-06-29 | Fanuc Ltd | Rotor of permanent magnet type synchronous motor |
| JPH0230270U (en) * | 1988-08-12 | 1990-02-26 |
-
1994
- 1994-05-11 JP JP6123095A patent/JPH07308057A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60121949A (en) * | 1983-12-05 | 1985-06-29 | Fanuc Ltd | Rotor of permanent magnet type synchronous motor |
| JPH0230270U (en) * | 1988-08-12 | 1990-02-26 |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982425A3 (en) * | 1998-08-17 | 2000-03-08 | Miele & Cie. GmbH & Co. | Laundry treatment apparatus |
| WO2004088819A1 (en) * | 2003-03-31 | 2004-10-14 | Robert Bosch Gmbh | Permanent magnetically excited electric machine |
| WO2005043723A1 (en) * | 2003-10-22 | 2005-05-12 | Emerson Electric Co. | Brushless permanent magnet motor with high power density, low cogging and low vibration |
| US6946760B2 (en) | 2003-10-22 | 2005-09-20 | Emerson Electric Co. | Brushless permanent magnet motor with high power density, low cogging and low vibration |
| US7692354B2 (en) | 2005-12-02 | 2010-04-06 | Moteurs Leroy-Somer | Rotary electric machine with reduced torque ripple |
| EP1793482A1 (en) | 2005-12-02 | 2007-06-06 | Moteurs Leroy-Somer | Rotary electric machine with reduced torque ripple |
| FR2894403A1 (en) * | 2005-12-02 | 2007-06-08 | Leroy Somer Moteurs | ROTATING ELECTRICAL MACHINE WITH REDUCED TORQUE CORDS |
| JP2007209186A (en) * | 2006-02-06 | 2007-08-16 | Mitsubishi Electric Corp | Synchronous motor and manufacturing method therefor |
| JP2009089546A (en) * | 2007-10-02 | 2009-04-23 | Hitachi Appliances Inc | Permanent magnet type rotating electric machine for washing machine |
| JP2012527210A (en) * | 2009-05-11 | 2012-11-01 | ムービング マグネット テクノロジーズ | Three-phase motor with low detent torque |
| JP2015149893A (en) * | 2009-05-11 | 2015-08-20 | ムービング マグネット テクノロジーズ | Three-phase electric motor with low detent torque |
| CN106505764A (en) * | 2016-11-18 | 2017-03-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure, motor and compressor |
| CN106505764B (en) * | 2016-11-18 | 2023-07-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure, motor and compressor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5465019A (en) | High-efficiency, low-noise electronically commutated motor having improved starting capability | |
| JP4284981B2 (en) | Permanent magnet motor | |
| WO2004093298A1 (en) | Permanent magnet type motor | |
| JP3928297B2 (en) | Electric motor and manufacturing method thereof | |
| JP2003092863A (en) | Permanent magnet embedded synchronous motor | |
| JPH07308057A (en) | Permanent magnet type synchronous motor | |
| JP2002345224A (en) | Permanent-magnet synchronous motor | |
| JP2003299342A (en) | Linear motor | |
| US6870291B2 (en) | Stepping motor | |
| JP2006304594A (en) | Grooved part of electric motor | |
| JP5082241B2 (en) | Linear motor and method of manufacturing stator included therein | |
| JP2001231240A (en) | Stepping motor | |
| JPS62230346A (en) | Winding method of brushless motor | |
| JP2001314071A (en) | Stepping motor | |
| JP2002034230A (en) | Armature of linear motor | |
| JPH07231587A (en) | Magnetic member of rotating machine | |
| JPH05316677A (en) | Stator of ac generator for vehicle | |
| JPH04121359U (en) | small motor | |
| JP3594731B2 (en) | Stepping motor | |
| JPH0731121A (en) | Step motor | |
| JP2002300740A (en) | Electric motor | |
| KR0155408B1 (en) | Step motor | |
| JPH0684785U (en) | Step motor stator | |
| JPH0721102Y2 (en) | Stepping motor | |
| JPS6043061A (en) | Permanent magnet motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040130 |