JP2000308287A - Permanent magnet embedded reluctance motor - Google Patents
Permanent magnet embedded reluctance motorInfo
- Publication number
- JP2000308287A JP2000308287A JP11110843A JP11084399A JP2000308287A JP 2000308287 A JP2000308287 A JP 2000308287A JP 11110843 A JP11110843 A JP 11110843A JP 11084399 A JP11084399 A JP 11084399A JP 2000308287 A JP2000308287 A JP 2000308287A
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- magnetic flux
- permanent magnet
- rotor core
- core blocks
- 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.)
- Withdrawn
Links
Landscapes
- Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ロータ軸方向に複
数個の永久磁石あるいは複数個のスリットを設けること
で、リラクタンストルクを利用するモータに関するもの
である。The present invention relates to a motor utilizing reluctance torque by providing a plurality of permanent magnets or a plurality of slits in a rotor axial direction.
【０００２】[0002]
【従来の技術】従来から鉄など高透磁率材からなるロー
タ本体に永久磁石を埋設したロータ本体が知られてい
る。図６は、リラクタンストルクを有効に利用するた
め、本発明者らが開発した２層構造の永久磁石付ロータ
を示している（特第２８３８１７号）。2. Description of the Related Art Conventionally, a rotor main body in which a permanent magnet is embedded in a rotor main body made of a material having high magnetic permeability such as iron is known. FIG. 6 shows a rotor with a permanent magnet of a two-layer structure developed by the present inventors in order to effectively use reluctance torque (Japanese Patent No. 283817).
【０００３】この先行発明に係わるロータ１は中心にロ
ータ軸２を有し、鉄製ロータコア３にロータ半径方向に
１極当たり２層に間隔を置いて配置された４組の永久磁
石４ａ，４ｂを埋設してなり、各組の永久磁石４ａ，４
ｂはＳ極，Ｎ極が交互となるように隣接して配置され、
いずれもロータの求心方向へ凸形をなす円弧形状に形成
されている。The rotor 1 according to the prior invention has a rotor shaft 2 at the center, and four sets of permanent magnets 4a and 4b arranged at intervals in two layers per pole in the rotor radial direction on a rotor core 3 made of iron. The permanent magnets 4a, 4
b is adjacently arranged so that the S pole and the N pole are alternately arranged;
Each of them is formed in an arc shape that is convex in the centripetal direction of the rotor.
【０００４】この鉄製ロータコア３は多数の有穴のコア
シートを積層して構成されるが、穴の位置を合わせて積
層し、上述の円弧状の永久磁石を挿入埋め込むことにな
る。The iron rotor core 3 is formed by laminating a large number of core sheets having holes. The iron rotor core 3 is laminated by aligning the positions of the holes, and the above-described arc-shaped permanent magnet is inserted and embedded.
【０００５】[0005]
【発明が解決しようとする課題】上記先行発明の構成に
おいては、ロータ組み付け工数としては最も少なく、低
コストで製作可能であるが、ロータに設けたスリット部
分がロータ軸と平行に真っ直ぐに構成されているため、
ステータとの位置関係でロータが回転中のコギングトル
ク変動が大きくなってしまう不具合点があった。In the structure of the above-mentioned prior invention, the number of man-hours for assembling the rotor is the smallest, and the rotor can be manufactured at low cost. However, the slit provided in the rotor is straight and parallel to the rotor shaft. Because
There was a problem that the cogging torque fluctuation during rotation of the rotor became large due to the positional relationship with the stator.
【０００６】この課題を解決するために、特開平１０−
８００７９号公報に示すように、ロータを回転軸方向に
複数個のコアブロックに分割し、各ブロックを回転方向
に所定の角度ずらして軸方向に一体構成されているモー
タが発明されている。In order to solve this problem, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 80079, there has been invented a motor in which a rotor is divided into a plurality of core blocks in a rotation axis direction and each block is shifted by a predetermined angle in a rotation direction to be integrally formed in an axial direction.
【０００７】しかしながら、この方法ではコギングトル
クを小さくできるが、各ブロック間で、軸方向に永久磁
石の発生する磁束が短絡するループができるため、ステ
ータに鎖交する磁束が減少し、発生トルクが小さくなる
という課題があった。However, in this method, the cogging torque can be reduced. However, a loop in which the magnetic flux generated by the permanent magnet is short-circuited in the axial direction between each block, so that the magnetic flux linked to the stator is reduced, and the generated torque is reduced. There was a problem of becoming smaller.
【０００８】簡単な一例として、図７をもとに説明す
る。図７はロータの内部に平板状の永久磁石を４個埋め
込んだ、埋め込み磁石型のロータであり、このロータを
２個のブロックに分割し、上下のブロックを回転方向に
ずらして、一体構成している。A simple example will be described with reference to FIG. FIG. 7 shows an embedded magnet type rotor in which four permanent magnets in the form of a plate are embedded in the rotor. This rotor is divided into two blocks, and the upper and lower blocks are shifted in the rotation direction to be integrally formed. ing.
【０００９】この図において、図示するように、上側の
Ｎ極から出た磁束が、下側のＳ極に入ってしまい、ロー
タ外部のステータに鎖交することなくロータ内部で短絡
ループを形成してしまい、トルク低下を起こしてしま
う。In this figure, as shown in the figure, the magnetic flux from the upper N pole enters the lower S pole and forms a short-circuit loop inside the rotor without linking to the stator outside the rotor. This causes a decrease in torque.
【００１０】[0010]
【課題を解決するための手段】本発明は上記先行発明の
問題点を解決するため、ロータの内部に永久磁石を軸方
向に埋設してなる永久磁石埋込型同期モータで、軸方向
に複数に分割した永久磁石を、軸方向に薄板状の電磁鋼
板を積層した複数個のロータコアブロックに個々に埋設
し、これら複数個のロータコアブロック完成品を、ロー
タの回転方向にずらして軸方向に一体構成してなるロー
タにおいて、これら複数個のロータコアブロック間に非
磁性体からなる薄板をはさみ込んで、一体構成したもの
である。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior invention, the present invention relates to a permanent magnet embedded synchronous motor having a permanent magnet embedded in the rotor in the axial direction. The permanent magnets divided into two parts are individually embedded in a plurality of rotor core blocks, each of which is made of laminated electromagnetic steel sheets in the axial direction, and these completed rotor core blocks are shifted in the direction of rotor rotation and integrated in the axial direction. In the rotor thus configured, a thin plate made of a non-magnetic material is sandwiched between the plurality of rotor core blocks to be integrally formed.
【００１１】この発明によれば、各ロータブロック間あ
る非磁性体の薄板が磁束の短絡を防ぐため、トルクの減
少なしにコギングトルクを低減することが可能となる。According to the present invention, the cogging torque can be reduced without reducing the torque because the thin plate of the non-magnetic material between the rotor blocks prevents short-circuit of the magnetic flux.
【００１２】本願第２発明は上記先行発明の問題点を解
決するため、第１の発明のロータにおいて、非磁性体か
らなる薄板の外径がロータコアの外径より小さいことを
特徴とする永久磁石埋込型リラクタンスモータである。According to a second aspect of the present invention, there is provided a rotor according to the first aspect, wherein the outer diameter of the thin plate made of a non-magnetic material is smaller than the outer diameter of the rotor core. It is an embedded type reluctance motor.
【００１３】この発明によれば、各ロータブロック間あ
る非磁性体の薄板が磁束の短絡を防ぎ、非磁性体の外径
がロータコアの外径より小さいため、非磁性体に発生す
る渦電流損失を最小限に抑えることが可能となる。According to the present invention, since the thin plate of the non-magnetic material between the rotor blocks prevents short-circuit of magnetic flux, and the outer diameter of the non-magnetic material is smaller than the outer diameter of the rotor core, eddy current loss generated in the non-magnetic material Can be minimized.
【００１４】[0014]
【発明の実施の形態】上記の課題を解決するために本発
明は、ロータの内部に永久磁石を軸方向に埋設してなる
永久磁石埋込型同期モータで、軸方向に複数に分割した
永久磁石を、軸方向に薄板状の電磁鋼板を積層した複数
個のロータコアブロックに個々に埋設し、これら複数個
のロータコアブロック完成品を、ロータの回転方向にず
らして軸方向に一体構成してなるロータにおいて、これ
ら複数個のロータコアブロック間に非磁性体からなる薄
板を挟み込んで、一体構成したものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, the present invention relates to a permanent magnet embedded type synchronous motor having a permanent magnet embedded in a rotor in an axial direction. The magnets are individually buried in a plurality of rotor core blocks in which laminated electromagnetic steel sheets are laminated in the axial direction, and the completed plurality of rotor core blocks are integrally formed in the axial direction while being shifted in the rotation direction of the rotor. In the rotor, a thin plate made of a non-magnetic material is sandwiched between the plurality of rotor core blocks to be integrally formed.
【００１５】[0015]
【実施例】（実施例１）図１に示すように、ロータ１は
図に示すような、複数に積層された電磁鋼板からなる、
ロータコアブロック２，３からなり、ロータコアブロッ
ク２，３の内部には永久磁石４が埋め込まれている。ロ
ータコアブロック２，３は薄板状の非磁性体５を挟み込
んで軸方向配置されており、さらにロータコアブロック
２，３は所定の角度ずらして一体構成されている。この
時、ロータコアブロック２に埋め込んだＮ極と、ロータ
コアブロック３に埋め込んだＳ極は回転軸方向に重なっ
ているが、非磁性体５によりＮ極からＳ極に流れる磁束
を抑えることができる。(Embodiment 1) As shown in FIG. 1, a rotor 1 is composed of a plurality of laminated electromagnetic steel sheets as shown in FIG.
The rotor core blocks 2 and 3 have permanent magnets 4 embedded therein. The rotor core blocks 2 and 3 are arranged in the axial direction with the thin plate-shaped non-magnetic member 5 interposed therebetween, and the rotor core blocks 2 and 3 are integrally formed at a predetermined angle. At this time, although the N pole embedded in the rotor core block 2 and the S pole embedded in the rotor core block 3 overlap in the direction of the rotation axis, the magnetic flux flowing from the N pole to the S pole can be suppressed by the nonmagnetic material 5.
【００１６】ロータコアブロック２とロータコアブロッ
ク３は、同一の回転軸に、圧入又は焼嵌めにより固定さ
れている。非磁性体５はロータコアブロック２とロータ
コアブロック３に挟まれ、ロータ１に固定されている。
薄板状の非磁性体は図３に示すような形状をしている。
非磁性体の材質としては、真鍮、アルミ、ステンレス等
の材質が挙げられる。The rotor core block 2 and the rotor core block 3 are fixed to the same rotating shaft by press fitting or shrink fitting. The non-magnetic material 5 is sandwiched between the rotor core blocks 2 and 3 and is fixed to the rotor 1.
The thin non-magnetic material has a shape as shown in FIG.
Examples of the material of the non-magnetic material include materials such as brass, aluminum, and stainless steel.
【００１７】このような構成にすることで、永久磁石４
から発生する磁束が、ロータ内部を軸方向に進んで短絡
磁束を構成することが無くなるため、永久磁束による鎖
交磁束を最大限に利用することが可能となる。With such a configuration, the permanent magnet 4
Since the magnetic flux generated from the magnetic flux does not travel in the rotor in the axial direction to form a short-circuit magnetic flux, it is possible to make maximum use of the interlinkage magnetic flux due to the permanent magnetic flux.
【００１８】（実施例２）図４は第２の実施例を示す図
である。第２の実施例は、第１の実施例の薄板状からな
る非磁性体の外径がロータコアの外径より小さいため、
非磁性体に発生する渦電流損失を最小限に抑えて、第１
の実施例と同様の効果を得ることができる。(Embodiment 2) FIG. 4 is a diagram showing a second embodiment. In the second embodiment, since the outer diameter of the thin plate-shaped non-magnetic material of the first embodiment is smaller than the outer diameter of the rotor core,
By minimizing the eddy current loss generated in the non-magnetic material, the first
The same effect as that of the embodiment can be obtained.
【００１９】（実施例３）第３の実施例は第１の実施例
のロータにおいて、非磁性体からなる薄板が、ロータコ
アを構成する電磁鋼板の板厚ｔに対して、０．５＜ｔ＜
１．５であることを特徴とする永久磁石埋込型リラクタ
ンスモータである。非磁性体の薄板の厚みは厚くなるほ
ど、ロータ内部の短絡磁束を防ぐ効果が大きくなるが、
非磁性体部で発生する渦電流損失が大きくなる。そこ
で、非磁性体部の厚みを電磁鋼板の板板厚ｔに対して、
０．５＜ｔ＜１．５にすることで、短絡磁束を防ぐとと
もに、渦電流損失も小さくすることが可能である。(Embodiment 3) The third embodiment is directed to the rotor of the first embodiment, wherein the thin plate made of a non-magnetic material is 0.5 <t with respect to the thickness t of the electromagnetic steel plate constituting the rotor core. <
It is a permanent magnet embedded type reluctance motor characterized in that the ratio is 1.5. The effect of preventing short-circuit magnetic flux inside the rotor increases as the thickness of the nonmagnetic thin plate increases,
Eddy current loss generated in the non-magnetic part increases. Therefore, the thickness of the non-magnetic material part is set to the thickness t of the electromagnetic steel sheet.
By setting 0.5 <t <1.5, it is possible to prevent short-circuit magnetic flux and reduce eddy current loss.
【００２０】（実施例４）第３の実施例は第１の実施例
のロータにおいて、非磁性体部が図５に示すように、薄
板状のものを複数枚重ねたことを特徴とする永久磁石埋
込型リラクタンスモータである。永久磁石に希土類磁石
のような起磁力の大きな永久磁石を用いた場合、非磁性
体部の厚みを厚くしなければならないが、ロータコアに
使用する電磁鋼板と同等の厚みをもつ非磁性体を複数枚
重ねることで短絡磁束を防ぐとともに、渦電流損失も小
さくすることが可能である。(Embodiment 4) A third embodiment is characterized in that the rotor of the first embodiment is characterized in that a plurality of thin non-magnetic members are stacked as shown in FIG. It is a magnet embedded type reluctance motor. When a permanent magnet with a large magnetomotive force, such as a rare earth magnet, is used as the permanent magnet, the thickness of the nonmagnetic material must be increased.However, there are multiple nonmagnetic materials having the same thickness as the electromagnetic steel sheet used for the rotor core. By stacking the sheets, short-circuit magnetic flux can be prevented and eddy current loss can be reduced.
【００２１】（実施例５）第１の実施例において、複数
個のロータコアブロック完成品を、ロータの回転方向に
ずらして軸方向に一体構成してなるロータにおいて、こ
れら複数個のロータコアブロック間に一定間隔のギャッ
プを設けることを特徴とした永久磁石埋込型リラクタン
スモータである。この構成では、非磁性体の代わりにギ
ャップを設けているが、空気も非磁性体であり、しかも
電気抵抗が非常に大きいので、渦電流損失を発生させる
ことなく、磁束の短絡を防ぐ効果を得ることが可能であ
る。(Embodiment 5) In the first embodiment, in a rotor in which a plurality of completed rotor core blocks are integrally formed in the axial direction while being shifted in the rotation direction of the rotor, the rotor core blocks are interposed between the plurality of rotor core blocks. This is a permanent magnet embedded type reluctance motor characterized by providing gaps at regular intervals. In this configuration, a gap is provided in place of a non-magnetic material.However, air is also a non-magnetic material and has a very high electric resistance. It is possible to get.
【００２２】[0022]
【発明の効果】上記実施例の記載から明らかなように、
本発明はロータの内部に永久磁石を軸方向に埋設してな
る永久磁石埋込型同期モータで、軸方向に複数に分割し
た永久磁石を、軸方向に薄板状の電磁鋼板を積層した複
数個のロータコアブロックに個々に埋設し、これら複数
個のロータコアブロック完成品を、ロータの回転方向に
ずらして軸方向に一体構成してなるロータにおいて、こ
れら複数個のロータコアブロック間に非磁性体からなる
薄板を挟み込んで、一体構成したものであり、ロータコ
アコアブロック間に非磁性体からなる薄板を設けること
で、永久磁石から発生する磁束が軸方向に短絡ループを
構成するのを防止して、鎖交磁束の減小を最小限にする
ことが可能になる。As is clear from the description of the above embodiment,
The present invention is a permanent magnet embedded synchronous motor in which permanent magnets are embedded in the rotor in the axial direction, and a plurality of permanent magnets divided into a plurality in the axial direction are laminated with a thin electromagnetic steel sheet in the axial direction. A plurality of rotor core block finished products which are individually buried in the rotor core block, and are integrally formed in the axial direction by shifting the rotor core block in the direction of rotation of the rotor. A thin plate is sandwiched and integrally formed.By providing a thin plate made of a non-magnetic material between the rotor core and the core block, the magnetic flux generated from the permanent magnet is prevented from forming a short-circuit loop in the axial direction, and the chain is formed. It is possible to minimize the reduction of the magnetic flux.
【図１】本願第１の実施例を示すロータの斜視図FIG. 1 is a perspective view of a rotor showing a first embodiment of the present invention.
【図２】（ａ）（ｂ）は本願第１の実施例を示すロータ
コアシートを示す図FIGS. 2A and 2B are views showing a rotor core sheet according to a first embodiment of the present invention.
【図３】本願第１の実施例による非磁性体からなる薄板
を示す図FIG. 3 is a view showing a thin plate made of a non-magnetic material according to the first embodiment of the present invention;
【図４】本願第２の実施例を示すロータの斜視図FIG. 4 is a perspective view of a rotor showing a second embodiment of the present invention.
【図５】本願第４の実施例による非磁性体からなる薄板
を示す図FIG. 5 is a view showing a thin plate made of a non-magnetic material according to a fourth embodiment of the present invention;
【図６】従来のロータの斜視図FIG. 6 is a perspective view of a conventional rotor.
１ ロータ ２，３ ロータコアブロック ４ 永久磁石 ５ 非磁性体 Reference Signs List 1 rotor 2, 3 rotor core block 4 permanent magnet 5 nonmagnetic material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 本田 幸夫 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 5H619 AA01 BB01 BB13 BB15 BB24 PP02 PP06 PP08 5H621 AA02 BB07 GA01 GA04 HH01 HH08 JK02 5H622 AA02 AA03 CA02 CA07 CA13 CB01 CB03 CB05 CB06 PP03 PP10 PP11 PP16 PP19 QB03 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yukio Honda 1006 Kazuma Kadoma, Kazuma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 5H622 AA02 AA03 CA02 CA07 CA13 CB01 CB03 CB05 CB06 PP03 PP10 PP11 PP16 PP19 QB03
Claims (5)
してなる、永久磁石埋込型同期モータで、軸方向に複数
に分割した永久磁石を、軸方向に薄板状の電磁鋼板を積
層した複数個のロータコアブロックに個々に埋設し、こ
れら複数個のロータコアブロック完成品を、ロータの回
転方向にずらして軸方向に一体構成してなるロータにお
いて、これら複数個のロータコアブロック間に非磁性体
からなる薄板をはさみ込んで、一体構成したロータを有
することを特徴とした永久磁石埋込型リラクタンスモー
タ。1. A permanent magnet embedded type synchronous motor in which permanent magnets are embedded in a rotor in an axial direction, wherein a plurality of permanent magnets divided in the axial direction are laminated with a thin electromagnetic steel sheet in the axial direction. Embedded in each of the plurality of rotor core blocks, and the completed rotor core blocks are integrally formed in the axial direction while being shifted in the rotation direction of the rotor. An embedded permanent magnet reluctance motor having a rotor integrally formed by sandwiching a thin plate made of a body.
径より小さいことを特徴とする請求項１記載の永久磁石
埋込型リラクタンスモータ。2. The permanent magnet embedded type reluctance motor according to claim 1, wherein the thin plate made of a non-magnetic material is smaller than the outer diameter of the rotor core.
構成する電磁鋼板の板厚ｔに対して、０．５＜ｔ＜１．
５であることを特徴とする請求項１記載の永久磁石埋込
型リラクタンスモータ。3. The thin plate made of a non-magnetic material has a thickness of 0.5 <t <1.
5. The permanent magnet embedded type reluctance motor according to claim 1.
とを特徴とする請求項１記載の永久磁石埋込型リラクタ
ンスモータ。4. The permanent magnet embedded type reluctance motor according to claim 1, wherein a plurality of thin plates made of a non-magnetic material are stacked.
ロータの回転方向にずらして軸方向に一体構成してなる
ロータにおいて、これら複数個のロータコアブロック間
に一定間隔のギャップを設けることを特徴とした請求項
１記載の永久磁石埋込型リラクタンスモータ。5. A plurality of completed rotor core blocks,
2. A permanent magnet embedded type reluctance motor according to claim 1, wherein a fixed gap is provided between said plurality of rotor core blocks in a rotor which is integrally formed in the axial direction shifted from the rotation direction of the rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11110843A JP2000308287A (en) | 1999-04-19 | 1999-04-19 | Permanent magnet embedded reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11110843A JP2000308287A (en) | 1999-04-19 | 1999-04-19 | Permanent magnet embedded reluctance motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000308287A true JP2000308287A (en) | 2000-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11110843A Withdrawn JP2000308287A (en) | 1999-04-19 | 1999-04-19 | Permanent magnet embedded reluctance motor |
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- 1999-04-19 JP JP11110843A patent/JP2000308287A/en not_active Withdrawn
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| JP2014128116A (en) * | 2012-12-26 | 2014-07-07 | Toyota Industries Corp | Permanent magnet embedded rotary electric machine |
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