JPS5846856A - Permanent magnet rotor - Google Patents
Permanent magnet rotorInfo
- Publication number
- JPS5846856A JPS5846856A JP56142233A JP14223381A JPS5846856A JP S5846856 A JPS5846856 A JP S5846856A JP 56142233 A JP56142233 A JP 56142233A JP 14223381 A JP14223381 A JP 14223381A JP S5846856 A JPS5846856 A JP S5846856A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- metal cover
- eddy current
- circumferential direction
- metallic cover
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は非磁性金属カバーを備えた永久磁石回転子に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a permanent magnet rotor with a non-magnetic metal cover.
近時、高効率可変速モータが望まれ、永久磁石モータを
インバータで回転させるシステムが増大している。しか
るに、この種の永久磁石モータの永久磁石回転子の強度
を確保するカバー材としては、金属製と非金属製のもの
とが考えられる。このうち、非金属製カバー材に関して
は、例えばガラスバイ°シト等が考えられるが、強度の
面では金属製材料にほぼ匹敵する反面、使用する接着剤
によって温度限界が決まる（例えば回転子の焼きばめが
できない）という欠点とか、バインド材の接着工程等に
手間がかかる等の欠点があった。一方、金属材を用いた
カバーは、アルミダイカスト等との組合わせによって高
温に耐えられ、しかも生産性が高いという利点を有する
反面、材質が導電性であるため、渦電流による損失を発
生して効率を低下させるという欠点があった。Recently, highly efficient variable speed motors have been desired, and the number of systems in which a permanent magnet motor is rotated by an inverter is increasing. However, the cover material for ensuring the strength of the permanent magnet rotor of this type of permanent magnet motor may be made of metal or non-metal. Regarding non-metallic cover materials, for example, glass bicarbonate can be considered, but while it is almost comparable to metal materials in terms of strength, the temperature limit is determined by the adhesive used (for example, when rotor There were disadvantages such as the fact that the binding material could not be painted) and the process of adhering the binder material was time-consuming. On the other hand, covers made of metal have the advantage of being able to withstand high temperatures and have high productivity when combined with aluminum die-casting, etc. However, since the material is conductive, they can cause losses due to eddy currents. This had the disadvantage of reducing efficiency.
これを、図を用いて説明するに、第１図、第２図は永久
磁石回転子の構造を示す断面図である。To explain this using figures, FIGS. 1 and 2 are cross-sectional views showing the structure of a permanent magnet rotor.
永久磁石回転子１は、回転子軸２と、該回転子軸２の外
周に配置された継鉄３と、該継鉄３の外周に配置された
円筒状永久磁石４と、該永久磁石４の外周に配置された
非磁性金属カバー５とから構成されており、前記継鉄３
と永久磁石４、及び該永久磁石４と金属カバー５の固定
手段には、接着剤等が使用されている。The permanent magnet rotor 1 includes a rotor shaft 2, a yoke 3 disposed on the outer periphery of the rotor shaft 2, a cylindrical permanent magnet 4 disposed on the outer periphery of the yoke 3, and the permanent magnet 4. and a non-magnetic metal cover 5 disposed around the outer periphery of the yoke 3.
An adhesive or the like is used for fixing the permanent magnet 4 and the permanent magnet 4 to the metal cover 5.
第３図は前記金属カバー５に渦電流が発生する原理を示
す図で、同図（イ）は永久磁石の配置状−態を示す図で
、また同図（ロ）は巻線に流れる電流による起磁力分布
図であり、位置検出器を備えたブラシレスモータでは直
流機とほぼ同様、永久磁石４に対して図に示すようにｑ
軸成分として表われる。FIG. 3 is a diagram showing the principle of generation of eddy current in the metal cover 5, FIG. 3(A) is a diagram showing the arrangement of permanent magnets, and FIG. This is a magnetomotive force distribution diagram based on the graph, and in a brushless motor equipped with a position detector, almost the same as a DC motor, the permanent magnet 4 is
It appears as an axial component.
そして、起磁力分布によって作られる磁束は、電機子電
流ｔ Ｐ Ｗ Ｍ （ハルスワイドモジュレーション）
制御することによって脈動する。同図（ハ）は前記金属
カバー５の周方向への展開図を示したもので、前記脈動
する磁束によって該金属カバー５の表面には、図中の矢
印で示す経路の電流が流れ、これによって該金属カバー
５中に渦電流を生ぜしめていた。The magnetic flux created by the magnetomotive force distribution is the armature current t P W M (Hulls wide modulation)
Pulsate by controlling. Figure (c) shows a developed view of the metal cover 5 in the circumferential direction, and the pulsating magnetic flux causes current to flow on the surface of the metal cover 5 along the path indicated by the arrow in the figure. This caused an eddy current to be generated in the metal cover 5.
本発明の目的は、渦電流損失を極力小さくした永久磁石
回転子を提供するにある。An object of the present invention is to provide a permanent magnet rotor in which eddy current loss is minimized.
このような目的を達成するために、本発明は、非磁性金
属カバーに、回転子軸の軸方向と直交する方向であって
かつカバーの円周方向に沿って表リット部を設けるよう
構成したものである。In order to achieve such an object, the present invention is configured such that a non-magnetic metal cover is provided with a front recess in a direction perpendicular to the axial direction of the rotor shaft and along the circumferential direction of the cover. It is something.
以下、図に示す実施例を用いて本発明の詳細な説明する
−
第４図は本発明に係る永久磁石回転子の一実施例を示す
斜視図である。本実施例は従来と同様の、回転子軸２、
継鉄３、永久磁石４を備えた永久磁石回転子６において
、前記永久磁石４の外周に配置された非磁性金属カバー
７に、回転子軸２の軸方向と直交する方向であって、か
つ金属カバー７の円周方向に沿って一定間隔おきにスリ
ット部。The present invention will be described in detail below with reference to the embodiments shown in the figures. Fig. 4 is a perspective view showing an embodiment of the permanent magnet rotor according to the present invention. In this embodiment, the rotor shaft 2,
In a permanent magnet rotor 6 equipped with a yoke 3 and a permanent magnet 4, a non-magnetic metal cover 7 disposed around the outer periphery of the permanent magnet 4 is provided with a metal cover 7 in a direction orthogonal to the axial direction of the rotor shaft 2, and Slit portions are formed at regular intervals along the circumferential direction of the metal cover 7.
７ａを設けた構成としたものである。ところで、該スリ
ット部７ａは、前記第３図に破線で示すように、渦電流
の主要通路上に設けられており、このような社リット部
７ａを設けた場合の渦電流の通路は第５図（Ｑで示すよ
うになる。なお、第５図囚は永久磁石４の配置状態を示
し、また同図■は巻線（図示せず）に流れる電流による
起磁力分布図である。該スリット部７ａの存在によって
、渦電流は流れにくくな、つて第５図０のように渦電流
の通路は細分化され、その結果全体として見た場合の渦
電流の通路の長さは長くなる。このことは、の式で表わ
される渦電流損失の値を小さくできることを意味する。7a is provided. By the way, the slit portion 7a is provided on the main path of the eddy current, as shown by the broken line in FIG. Figure (shown as Q). Figure 5 shows the arrangement of the permanent magnets 4, and Figure 5 shows the magnetomotive force distribution due to the current flowing through the winding (not shown). The presence of the portion 7a makes it difficult for eddy currents to flow, and the eddy current path is subdivided as shown in FIG. This means that the value of eddy current loss expressed by the equation can be reduced.
また、前記金属カバー７は、スリット部７ａを回転子軸
２の軸方向と直向する方向であってかつ金属カバー７の
円周方向に沿って設けた構成としであるので、金属カバ
−７自体の機械的な強度を大きくそこなうことなく、渦
電流損失を小さくできるという利点を有する。ｉだ、金
属力・く−７は、スリット部７ａ間にブリッジ部７ｂを
有する構造となっているので、軸方向に対する強度面及
び該スリット部７ａ切削時における磁石損傷等のおそれ
がない点で第６図に示すものよりも有利である。Further, since the metal cover 7 has a structure in which the slit portion 7a is provided in a direction perpendicular to the axial direction of the rotor shaft 2 and along the circumferential direction of the metal cover 7, the metal cover 7 It has the advantage that eddy current loss can be reduced without significantly impairing its mechanical strength. i. Since the Metallic Power Coupler 7 has a structure with a bridge part 7b between the slit parts 7a, it is strong in the axial direction and there is no risk of damage to the magnet when cutting the slit part 7a. This is advantageous over that shown in FIG.
更に、前記ブリッジ部７ｂを周方向１極対に対して１個
の構造では、該ブリッジ部７ｂに発生する電圧の方向が
同一となり、ブリッジ部７ｂをまたがる渦電流の発生を
抑制できるので、渦電流損失をさらに小さくなさしめる
ことができる。Furthermore, in the structure in which one bridge portion 7b is provided for one pole pair in the circumferential direction, the direction of the voltage generated in the bridge portion 7b is the same, and the generation of eddy current across the bridge portion 7b can be suppressed. Current loss can be further reduced.
第６図は本発明の他の実施例を示すもので、上述した第
一実施例の永久磁石回転子と異なるところは、金属カバ
ー７に設けたスリット部７ａを、回転子軸２の軸方向と
直交する方向であってかつ該金属カバー７の円周方向に
沿って連続して設けるように構成したものである。した
がって、このように円周方向全周にわたってスリット部
７ａを設けた構成によっては、第５図（０に二点鎖線Ａ
で示すよ・うな渦電流（第一実施例構造においてブリッ
ジ部７ｂに発生していた渦電流）をなくすことができる
ので、渦電流損失をさらに小さくできるという効果を奏
する。FIG. 6 shows another embodiment of the present invention, and the difference from the permanent magnet rotor of the first embodiment described above is that the slit portion 7a provided in the metal cover 7 is arranged in the axial direction of the rotor shaft 2. The metal cover 7 is arranged in a direction perpendicular to the metal cover 7 and continuously along the circumferential direction of the metal cover 7. Therefore, depending on the configuration in which the slit portion 7a is provided over the entire circumferential direction, as shown in FIG.
Since the eddy current shown in (the eddy current generated in the bridge portion 7b in the structure of the first embodiment) can be eliminated, it is possible to further reduce the eddy current loss.
なお、第７図に示すように、前記スリット部１７ａを金
属カバー７に形成する際、該金属カバー７が平板状の状
態において打ち抜き加工すると、製作上有利である。As shown in FIG. 7, when forming the slit portion 17a in the metal cover 7, it is advantageous in manufacturing if the metal cover 7 is punched out in a flat state.
以上説明したように本発明によれば、非磁性金属カバー
に、回転子軸の軸方向と直交する方向であってかつカバ
ーの円周方向に沿ってスリット部を設けた構成としたこ
とにより、渦電流損失を極力小さくでき、効率の低下を
防止できるので、量産性に向いた金属カバーを永久磁石
回転子カレ＜−材として適用できるという効果を奏する
。As explained above, according to the present invention, the non-magnetic metal cover is provided with a slit section in a direction perpendicular to the axial direction of the rotor shaft and along the circumferential direction of the cover. Since the eddy current loss can be minimized and a decrease in efficiency can be prevented, the metal cover suitable for mass production can be used as the permanent magnet rotor curvature material.
第１図は従来の永久磁石回転子の縦断面図、第２図は同
永久磁石回転子の横断面図、第３図は金属カバーに渦電
流が発生する原理を示す図、第４図は本発明に係る永久
磁石回転子の一実施例番示す斜視図、第５図は本発明の
金属カバーに渦電流が発生する原理を示す図、第６図は
本発明の他の実施例を示す永久磁石回転子の斜視図、第
７図は金属カバーの平板状の状態を示す図である。Figure 1 is a longitudinal cross-sectional view of a conventional permanent magnet rotor, Figure 2 is a cross-sectional view of the same permanent magnet rotor, Figure 3 is a diagram showing the principle of eddy current generation in a metal cover, and Figure 4 is a diagram showing the principle of generation of eddy current in a metal cover. A perspective view showing one embodiment of the permanent magnet rotor according to the present invention, FIG. 5 is a diagram showing the principle of generation of eddy current in the metal cover of the present invention, and FIG. 6 shows another embodiment of the present invention. FIG. 7, a perspective view of the permanent magnet rotor, is a diagram showing the flat state of the metal cover.
Claims (1)
る継鉄と、該継鉄の外周に配置された永久磁石と、該永
久磁石の外周に配置された非磁性金属カバーとを備えた
永久磁石回転子において、前記非磁炸金属カバーに、回
転子軸の軸方向と直交する方向であってかつカバーの円
周方向に沿ってスリット部を設けたことを特徴とする永
久磁石回転子。 ２、前記非磁性金属カバーにおいて、スリット部を非磁
性金属カバーの周方向に一定間隔おきに設けると共に、
該スリット部間に位置するブリッジ部の周方向の間隔が
、１極対の整数倍であるように形成された特許請求の範
囲第１項記載の永久磁石回転子。 ３、前記スリット部を非磁性金属カバーの周方向に連続
して設けた特許請求の範囲第１項記載の永久磁石回転子
。[Claims] 1. A yoke arranged on the outer periphery of the rotor shaft and forming a rotor magnetic path, a permanent magnet arranged on the outer periphery of the yoke, and a yoke arranged on the outer periphery of the permanent magnet. In the permanent magnet rotor equipped with a non-magnetic metal cover, a slit portion is provided in the non-magnetic metal cover in a direction perpendicular to the axial direction of the rotor shaft and along the circumferential direction of the cover. A permanent magnet rotor featuring: 2. In the non-magnetic metal cover, slits are provided at regular intervals in the circumferential direction of the non-magnetic metal cover, and
The permanent magnet rotor according to claim 1, wherein the circumferential distance between the bridge portions located between the slit portions is an integral multiple of one pole pair. 3. The permanent magnet rotor according to claim 1, wherein the slit portion is continuously provided in the circumferential direction of the non-magnetic metal cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56142233A JPS5846856A (en) | 1981-09-11 | 1981-09-11 | Permanent magnet rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56142233A JPS5846856A (en) | 1981-09-11 | 1981-09-11 | Permanent magnet rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5846856A true JPS5846856A (en) | 1983-03-18 |
| JPS6326623B2 JPS6326623B2 (en) | 1988-05-31 |
Family
ID=15310516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56142233A Granted JPS5846856A (en) | 1981-09-11 | 1981-09-11 | Permanent magnet rotor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5846856A (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60103641A (en) * | 1983-11-11 | 1985-06-07 | Nippon Telegr & Teleph Corp <Ntt> | Semiconductor device and manufacture thereof |
| JPS61126778U (en) * | 1985-01-28 | 1986-08-08 | ||
| JPH0297244A (en) * | 1988-10-03 | 1990-04-09 | Hitachi Ltd | Permanent magnet type rotor |
| JPH0294441U (en) * | 1989-01-12 | 1990-07-26 | ||
| WO1997018613A1 (en) * | 1995-11-13 | 1997-05-22 | Empresa Brasileira De Compressores S/A Embraco | A rotor cover for an electric motor |
| US5744887A (en) * | 1995-04-14 | 1998-04-28 | Matsushita Electric Industrial Co., Ltd. | Permanent magnet rotor and manufacturing method thereof |
| US6291919B1 (en) * | 2000-01-26 | 2001-09-18 | General Electric Company | Conductive structural interface for a non-metallic rotor enclosure |
| WO2002095907A1 (en) * | 2001-05-22 | 2002-11-28 | Lg Electronics Inc. | Reciprocating motor |
| US6900571B2 (en) | 2002-03-27 | 2005-05-31 | Mitsubishi Denki Kabushiki Kaisha | Rotor for synchronous induction motor, including slots and slits, and compressor |
| US7791237B2 (en) * | 2006-12-19 | 2010-09-07 | General Electric Company | Fault-tolerant synchronous permanent magnet machine |
| JP2011166952A (en) * | 2010-02-10 | 2011-08-25 | Fuji Electric Co Ltd | Permanent magnet rotary machine |
| US20130043756A1 (en) * | 2011-08-18 | 2013-02-21 | Ge Energy Power Conversion Technology Ltd. | Retaining bands |
| JP2013115899A (en) * | 2011-11-28 | 2013-06-10 | Mitsubishi Electric Corp | Rotor of permanent magnet type motor, manufacturing method of the same, and permanent magnet type motor |
| CN103166351A (en) * | 2011-12-19 | 2013-06-19 | 罗伯特·博世有限公司 | Rotor for an electric motor |
| EP2658095A1 (en) * | 2012-04-25 | 2013-10-30 | Siemens Aktiengesellschaft | Electric machine with slit rotor shaft |
| CN104917318A (en) * | 2015-06-16 | 2015-09-16 | 哈尔滨工业大学 | Sheath of high-speed permanent magnet motor rotor |
| KR20190033823A (en) * | 2017-09-22 | 2019-04-01 | 엘지이노텍 주식회사 | Motor |
| CN110022011A (en) * | 2019-05-06 | 2019-07-16 | 哈尔滨工业大学 | A kind of novel high speed motor sheath structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4945305A (en) * | 1972-09-07 | 1974-04-30 | ||
| JPS5058208U (en) * | 1973-09-26 | 1975-05-30 | ||
| JPS5140715U (en) * | 1974-09-20 | 1976-03-26 | ||
| US4117360A (en) * | 1977-04-15 | 1978-09-26 | General Electric Company | Self-supporting amortisseur cage for high-speed synchronous machine solid rotor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5140715B2 (en) * | 1971-08-27 | 1976-11-05 |
-
1981
- 1981-09-11 JP JP56142233A patent/JPS5846856A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4945305A (en) * | 1972-09-07 | 1974-04-30 | ||
| JPS5058208U (en) * | 1973-09-26 | 1975-05-30 | ||
| JPS5140715U (en) * | 1974-09-20 | 1976-03-26 | ||
| US4117360A (en) * | 1977-04-15 | 1978-09-26 | General Electric Company | Self-supporting amortisseur cage for high-speed synchronous machine solid rotor |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60103641A (en) * | 1983-11-11 | 1985-06-07 | Nippon Telegr & Teleph Corp <Ntt> | Semiconductor device and manufacture thereof |
| JPS61126778U (en) * | 1985-01-28 | 1986-08-08 | ||
| JPH0297244A (en) * | 1988-10-03 | 1990-04-09 | Hitachi Ltd | Permanent magnet type rotor |
| JPH0294441U (en) * | 1989-01-12 | 1990-07-26 | ||
| US5744887A (en) * | 1995-04-14 | 1998-04-28 | Matsushita Electric Industrial Co., Ltd. | Permanent magnet rotor and manufacturing method thereof |
| WO1997018613A1 (en) * | 1995-11-13 | 1997-05-22 | Empresa Brasileira De Compressores S/A Embraco | A rotor cover for an electric motor |
| US6291919B1 (en) * | 2000-01-26 | 2001-09-18 | General Electric Company | Conductive structural interface for a non-metallic rotor enclosure |
| CN100454730C (en) * | 2001-05-22 | 2009-01-21 | Lg电子株式会社 | Reciprocating motor |
| US6900558B1 (en) | 2001-05-22 | 2005-05-31 | Lg Electronics Inc. | Reciprocating motor |
| WO2002095907A1 (en) * | 2001-05-22 | 2002-11-28 | Lg Electronics Inc. | Reciprocating motor |
| US6900571B2 (en) | 2002-03-27 | 2005-05-31 | Mitsubishi Denki Kabushiki Kaisha | Rotor for synchronous induction motor, including slots and slits, and compressor |
| US7791237B2 (en) * | 2006-12-19 | 2010-09-07 | General Electric Company | Fault-tolerant synchronous permanent magnet machine |
| JP2011166952A (en) * | 2010-02-10 | 2011-08-25 | Fuji Electric Co Ltd | Permanent magnet rotary machine |
| CN102957246A (en) * | 2011-08-18 | 2013-03-06 | Ge能源能量变换技术有限公司 | Retaining band of a rotor |
| US20130043756A1 (en) * | 2011-08-18 | 2013-02-21 | Ge Energy Power Conversion Technology Ltd. | Retaining bands |
| US9018817B2 (en) * | 2011-08-18 | 2015-04-28 | Ge Energy Power Conversion Technology Limited | Retaining bands |
| JP2013115899A (en) * | 2011-11-28 | 2013-06-10 | Mitsubishi Electric Corp | Rotor of permanent magnet type motor, manufacturing method of the same, and permanent magnet type motor |
| CN103166351A (en) * | 2011-12-19 | 2013-06-19 | 罗伯特·博世有限公司 | Rotor for an electric motor |
| EP2658095A1 (en) * | 2012-04-25 | 2013-10-30 | Siemens Aktiengesellschaft | Electric machine with slit rotor shaft |
| CN104917318A (en) * | 2015-06-16 | 2015-09-16 | 哈尔滨工业大学 | Sheath of high-speed permanent magnet motor rotor |
| KR20190033823A (en) * | 2017-09-22 | 2019-04-01 | 엘지이노텍 주식회사 | Motor |
| CN110022011A (en) * | 2019-05-06 | 2019-07-16 | 哈尔滨工业大学 | A kind of novel high speed motor sheath structure |
| CN110022011B (en) * | 2019-05-06 | 2021-04-13 | 哈尔滨工业大学 | High-speed motor sheath structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6326623B2 (en) | 1988-05-31 |
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