JPH08228447A - Synchronous motor equipped with rotor having permanent magnet - Google Patents
Synchronous motor equipped with rotor having permanent magnetInfo
- Publication number
- JPH08228447A JPH08228447A JP7034844A JP3484495A JPH08228447A JP H08228447 A JPH08228447 A JP H08228447A JP 7034844 A JP7034844 A JP 7034844A JP 3484495 A JP3484495 A JP 3484495A JP H08228447 A JPH08228447 A JP H08228447A
- Authority
- JP
- Japan
- Prior art keywords
- axial direction
- magnetic flux
- permanent magnet
- permanent magnets
- rotor
- 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
Landscapes
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、サーボモータのよう
な円柱状の軸の外周に円筒状の永久磁石を固着した永久
磁石付回転子を備える同期電動機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous motor having a rotor with a permanent magnet having a cylindrical permanent magnet fixed to the outer periphery of a cylindrical shaft such as a servomotor.
【０００２】[0002]
【従来の技術】永久磁石の材料の種類によっては、寸法
のあまり大きいものは製造が難しく、円筒状の永久磁石
は直径より軸方向長さがあまり大きくない。このため、
軸方向長さが大きい回転子は、短い永久磁石を軸方向に
突き合わせて固着する。一方、永久磁石付回転子を備え
る同期電動機では、固定子のスロット数と極数の最小公
倍数の数だけ、回転子の１回転のうちにコギングトルク
による回転むらが発生する。このため、永久磁石に軸方
向のスキュー着磁をさせてコギングトルクの発生を防止
しようとする。スキューは固定子の、例えば１／２スロ
ットピッチ以上とされる。2. Description of the Related Art Depending on the type of permanent magnet material, it is difficult to manufacture a permanent magnet having an excessively large size, and a cylindrical permanent magnet has an axial length not much larger than its diameter. For this reason,
A rotor having a large axial length has short permanent magnets butted and fixed in the axial direction. On the other hand, in a synchronous motor including a rotor with a permanent magnet, uneven rotation due to cogging torque occurs in one rotation of the rotor by the number of slots, which is the least common multiple of the number of slots of the stator. Therefore, the permanent magnet is skew-magnetized in the axial direction to prevent generation of cogging torque. The skew is, for example, 1/2 slot pitch or more of the stator.
【０００３】図２は従来例の回転子の表面磁束グラフを
付記した断面図である。図において、円柱状の軸３の外
周に２個の円筒状の永久磁石１１、１２を軸方向に突き
合わせて接着などで固着し、永久磁石１１、１２に軸方
向の図示しないスキュー着磁をさせる。FIG. 2 is a sectional view showing a surface magnetic flux graph of a conventional rotor. In the figure, two cylindrical permanent magnets 11 and 12 are axially butted and fixed to each other on the outer periphery of a cylindrical shaft 3 by adhesion or the like, and the permanent magnets 11 and 12 are skew-magnetized in the axial direction (not shown). .
【０００４】[0004]
【発明が解決しようとする課題】前記の従来例の電動機
を試験すると、正しいスキュー着磁をしたにもかかわら
ず、コギングトルクが残存して運転中の回転むらを起こ
していた。分析すると、図に付記した表面磁束グラフの
ように、表面磁束の両端の漏洩磁束の結果、両永久磁石
１１、１２の軸方向両端に表面磁束の低下ｃが見られて
軸方向に不均一である。固定子との関係における磁気回
路内において軸方向の磁束分布が一定でなく、逆起電圧
波形に高調波の変形がみられる。このため、コギングト
ルクによる回転むらが発生する。When the electric motor of the above-mentioned conventional example was tested, it was found that the cogging torque remained and uneven rotation occurred during operation, although the skew was magnetized correctly. As a result of the analysis, as shown in the surface magnetic flux graph attached to the figure, as a result of the leakage magnetic flux at both ends of the surface magnetic flux, a decrease c in the surface magnetic flux is observed at both axial ends of both permanent magnets 11 and 12, and the magnetic flux is uneven in the axial direction. is there. In the magnetic circuit in relation to the stator, the magnetic flux distribution in the axial direction is not constant, and harmonic deformation is observed in the back electromotive voltage waveform. Therefore, uneven rotation occurs due to the cogging torque.
【０００５】この発明の目的は、磁気回路内における軸
方向の磁束分布を均一に近づけてスキュー効果を発揮さ
せ、コギングトルクによる回転むらを減少させることが
できる永久磁石付回転子を備える同期電動機を提供する
ことにある。An object of the present invention is to provide a synchronous motor having a rotor with a permanent magnet, which can make the magnetic flux distribution in the axial direction in the magnetic circuit evenly close to exhibit the skew effect and reduce the uneven rotation due to the cogging torque. To provide.
【０００６】[0006]
【課題を解決するための手段】この発明の永久磁石付回
転子を備える同期電動機は、円柱状又は円筒状の軸の外
周に円筒状の永久磁石を固着し、永久磁石に軸方向のス
キュー着磁をさせる永久磁石付回転子を備える同期電動
機において、永久磁石を中央部で軸方向に分割し、分割
された永久磁石の間に軸方向の隙間を設けるものであ
る。A synchronous motor including a rotor with a permanent magnet according to the present invention has a cylindrical permanent magnet fixed to the outer circumference of a cylindrical or cylindrical shaft, and skewed in the axial direction to the permanent magnet. In a synchronous motor including a rotor with a permanent magnet for magnetizing, a permanent magnet is axially divided at a central portion, and an axial gap is provided between the divided permanent magnets.
【０００７】[0007]
【作用】この発明によれば、永久磁石の軸方向の中央部
に隙間があるので、隙間を含む中央部近傍に表面磁束の
低下があり、両端の表面磁束の低下も減少し、磁気回路
内における軸方向の磁束分布を均一に近づけてスキュー
効果が発揮され、コギングトルクによる回転むらが減少
する。According to the present invention, since there is a gap in the central portion in the axial direction of the permanent magnet, the surface magnetic flux is reduced in the vicinity of the central portion including the gap, and the reduction of the surface magnetic flux at both ends is also reduced. The magnetic flux distribution in the axial direction is uniformly brought close to the skew effect, and the rotational unevenness due to the cogging torque is reduced.
【０００８】[0008]
【実施例】図１は実施例の回転子の表面磁束グラフを付
記した断面図である。図において、円柱状の軸３の外周
に２個の円筒状の永久磁石１、２を接着などで固着し、
永久磁石１、２に軸方向の図示しないスキュー着磁をさ
せる。そして、永久磁石１、２は中央部で軸方向に分割
された形なので、分割された永久磁石の間に軸方向の隙
間Ｐを設ける。永久磁石は２個以上にも適用でき、例え
ば、３個のときには全長の１／２のもの１個と１／４の
もの２個にするとか、１／４のもの４個にするなどでき
る。永久磁石の材料の種類によっては、寸法のあまり大
きいものは製造が難しく、軸方向に短いので、分割は価
格を高くすることがない。EXAMPLE FIG. 1 is a sectional view showing a surface magnetic flux graph of a rotor of an example. In the figure, two cylindrical permanent magnets 1 and 2 are fixed to the outer circumference of a columnar shaft 3 by adhesion,
The permanent magnets 1 and 2 are skew-magnetized in the axial direction (not shown). Since the permanent magnets 1 and 2 are divided in the central portion in the axial direction, an axial gap P is provided between the divided permanent magnets. The permanent magnets can be applied to two or more pieces. For example, when the number of the permanent magnets is three, it can be one half of the total length and two pieces of the quarter, or four pieces of the quarter. Depending on the type of permanent magnet material, too large dimensions are difficult to manufacture and axially short, so splitting does not add cost.
【０００９】この実施例によれば、永久磁石１、２の軸
方向の中央部に隙間Ｐがあるので、図に付記した表面磁
束グラフのように、隙間Ｐを含む中央部近傍に表面磁束
の低下ａがあり、両端の表面磁束の低下ｂも減少し、磁
気回路内における軸方向の磁束分布を均一に近づけてス
キュー効果が発揮され、コギングトルクによる回転むら
が減少する。According to this embodiment, since there is a gap P at the central portion in the axial direction of the permanent magnets 1 and 2, the surface magnetic flux near the central portion including the gap P is shown in the surface magnetic flux graph shown in the figure. There is a decrease a, the decrease b of the surface magnetic flux at both ends is also reduced, the axial magnetic flux distribution in the magnetic circuit is brought closer to uniform, the skew effect is exhibited, and rotational unevenness due to cogging torque is reduced.
【００１０】[0010]
【発明の効果】この発明の永久磁石付回転子を備える同
期電動機によれば、永久磁石の軸方向の中央部に隙間が
あるので、隙間を含む中央部近傍に表面磁束の低下があ
り、両端の表面磁束の低下も減少し、磁気回路内におけ
る軸方向の磁束分布を均一に近づけてスキュー効果が発
揮され、コギングトルクによる回転むらが減少するとい
う効果がある。According to the synchronous motor having the rotor with a permanent magnet of the present invention, since there is a gap in the central portion in the axial direction of the permanent magnet, the surface magnetic flux is reduced in the vicinity of the central portion including the gap. The decrease in the surface magnetic flux is also reduced, the magnetic flux distribution in the axial direction in the magnetic circuit is brought closer to uniform, and the skew effect is exerted, so that the rotation unevenness due to the cogging torque is reduced.
【図１】実施例の回転子の表面磁束グラフを付記した断
面図FIG. 1 is a sectional view showing a surface magnetic flux graph of a rotor of an example.
【図２】従来例の回転子の表面磁束グラフを付記した断
面図FIG. 2 is a sectional view showing a surface magnetic flux graph of a conventional rotor.
１ 永久磁石 ２ 永久磁石 ３ 軸 Ｐ 隙間 1 permanent magnet 2 permanent magnet 3 axis P gap
Claims (1)
久磁石を固着し、永久磁石に軸方向のスキュー着磁をさ
せる永久磁石付回転子を備える同期電動機において、 永久磁石を中央部で軸方向に分割し、分割された永久磁
石の間に軸方向の隙間を設けることを特徴とする永久磁
石付回転子を備える同期電動機。1. A synchronous motor having a rotor with a permanent magnet, wherein a cylindrical permanent magnet is fixed to the outer periphery of a cylindrical or cylindrical shaft, and the permanent magnet is skew-magnetized in the axial direction. A synchronous motor provided with a rotor with a permanent magnet, characterized in that an axial gap is provided between the divided permanent magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7034844A JPH08228447A (en) | 1995-02-23 | 1995-02-23 | Synchronous motor equipped with rotor having permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7034844A JPH08228447A (en) | 1995-02-23 | 1995-02-23 | Synchronous motor equipped with rotor having permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08228447A true JPH08228447A (en) | 1996-09-03 |
Family
ID=12425507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7034844A Pending JPH08228447A (en) | 1995-02-23 | 1995-02-23 | Synchronous motor equipped with rotor having permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08228447A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2397678A2 (en) | 2010-06-15 | 2011-12-21 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Internal Combustion Engine |
| JP2013099111A (en) * | 2011-10-31 | 2013-05-20 | Taiho Kogyo Co Ltd | Motor |
-
1995
- 1995-02-23 JP JP7034844A patent/JPH08228447A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2397678A2 (en) | 2010-06-15 | 2011-12-21 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Internal Combustion Engine |
| JP2013099111A (en) * | 2011-10-31 | 2013-05-20 | Taiho Kogyo Co Ltd | Motor |
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