JP2010183800A - Rotor of electric motor, electric motor, air blower and compressor - Google Patents

Rotor of electric motor, electric motor, air blower and compressor Download PDF

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JP2010183800A
JP2010183800A JP2009027384A JP2009027384A JP2010183800A JP 2010183800 A JP2010183800 A JP 2010183800A JP 2009027384 A JP2009027384 A JP 2009027384A JP 2009027384 A JP2009027384 A JP 2009027384A JP 2010183800 A JP2010183800 A JP 2010183800A
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rotor
electric motor
shape
permanent magnet
air hole
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Koji Yabe
浩二 矢部
Isato Yoshino
勇人 吉野
Kazuhiko Baba
和彦 馬場
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of an electric motor having an air hole that is efficiently arranged without blocking the flow of magnetic flux of a permanent magnet even if the air hole is arranged between electrodes. <P>SOLUTION: The rotor 200 of the electric motor includes: a rotor iron core 1 configured by laminating a predetermined number of electromagnetic steel plates punched in a predetermined shape; a shaft hole 4 provided at the approximately center part of the rotor iron core 1; a permanent magnet 2 provided on the rotor iron core 1, having one pole formed in the shape of V with its apex side facing the shaft hole, and having the V shapes corresponding to the number of the poles arranged at approximately equal intervals in the circumferential direction; and an air hole 3 provided between the electrodes of the permanent magnet 2 including a shape which is at least longer in the circumferential direction than in the radial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、電動機の回転子に関する。具体的には、永久磁石埋込型電動機の回転子の極間に存在する風穴の形状に関する。また、その電動機の回転子を用いる電動機及び送風機及び圧縮機に関する。   The present invention relates to a rotor of an electric motor. Specifically, the present invention relates to the shape of an air hole existing between the rotor poles of an embedded permanent magnet electric motor. The present invention also relates to an electric motor, a blower, and a compressor that use the rotor of the electric motor.

従来、高速回転に耐えうる回転子強度を確保しつつ冷却性能を向上させ、小型で高トルク、高出力を得ることができると共に、信頼性の向上を図った回転電機を提供するために、環状の固定子と、この固定子の内側に回転自在に配置された環状の回転子とを備え、固定子は、電機子巻線を持つ固定子鉄心を有し、回転子は、複数個の永久磁石が外周部に沿って装着されると共に冷媒が通る冷却穴が形成された回転子鉄心を有し、冷却穴は、回転子鉄心の外周側に向かって凸となる断面形状を有するように形成されている回転電機が提案されている（例えば、特許文献１参照）。   Conventionally, in order to provide a rotating electrical machine that can improve the cooling performance while ensuring the rotor strength that can withstand high-speed rotation, and can obtain a small size, high torque, and high output, and improved reliability. And an annular rotor rotatably disposed inside the stator, the stator having a stator core having an armature winding, and the rotor having a plurality of permanent A magnet is mounted along the outer periphery and has a rotor core formed with a cooling hole through which a refrigerant passes. The cooling hole is formed to have a cross-sectional shape that protrudes toward the outer periphery of the rotor core. A rotating electrical machine has been proposed (see, for example, Patent Document 1).

特開２００７−１０４８８８号公報JP 2007-104888 A

しかしながら、上記特許文献１の回転電機（埋込磁石型電動機）は、風穴（冷却穴）形状を外周に向かって凸となる形状としている。そのため、磁束の流れを阻害する形状であり、風穴（冷却穴）形状を大きくすると磁束の流れを阻害し、磁力を有効に使用できない。従って、効率が低下するという課題があった。   However, the rotating electrical machine (embedded magnet type electric motor) disclosed in Patent Document 1 has an air hole (cooling hole) shape that is convex toward the outer periphery. For this reason, it is a shape that obstructs the flow of magnetic flux, and if the air hole (cooling hole) shape is increased, the flow of magnetic flux is obstructed and magnetic force cannot be used effectively. Therefore, there is a problem that efficiency is lowered.

この発明は、上記のような課題を解決するためになされたもので、極間に風穴を配置しても永久磁石の磁束の流れを阻害することなく効率よく風穴を配置できる電動機の回転子及び電動機及び送風機及び圧縮機を提供することを目的とする。   The present invention has been made to solve the above-described problems, and even when an air hole is arranged between poles, an electric motor rotor capable of efficiently arranging an air hole without hindering the flow of magnetic flux of the permanent magnet and An object is to provide an electric motor, a blower, and a compressor.

この発明に係る電動機の回転子は、
所定の形状に打ち抜いた電磁鋼板を所定の枚数積層することにより構成される回転子鉄心と、
回転子鉄心の略中心部に設けられる軸孔と、
回転子鉄心に設けられ、頂点側を軸孔に向けてＶ字形状に配置されて一極を形成し、Ｖ字形状を極数分だけ円周方向に略等間隔に配置される永久磁石と、
永久磁石の極間に設けられ、少なくとも径方向よりも周方向に長い形状のものを含む風穴と、を備えたものである。 The rotor of the electric motor according to this invention is
A rotor core constructed by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape;
A shaft hole provided at substantially the center of the rotor core;
A permanent magnet provided on the rotor core, arranged in a V shape with the apex side toward the shaft hole to form one pole, and the V shape is arranged at substantially equal intervals in the circumferential direction by the number of poles; ,
The air hole is provided between the poles of the permanent magnet and includes at least a shape having a shape longer in the circumferential direction than in the radial direction.

この発明に係る電動機の回転子は、所定の形状に打ち抜いた電磁鋼板を所定の枚数積層することにより構成される回転子鉄心と、回転子鉄心の略中心部に設けられる軸孔と、回転子鉄心に設けられ、頂点側を軸孔に向けてＶ字形状に配置されて一極を形成し、Ｖ字形状を極数分だけ円周方向に略等間隔に配置される永久磁石と、永久磁石の極間に設けられ、少なくとも径方向よりも周方向に長い形状のものを含む風穴とを備えた構成にしたので、極間において永久磁石の磁束の流れを阻害しないため、効率を低下させることなく風穴の面積を拡大することができる。   A rotor of an electric motor according to the present invention includes a rotor core configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape, a shaft hole provided at a substantially central portion of the rotor core, and the rotor A permanent magnet provided on the iron core, arranged in a V shape with the apex side facing the shaft hole to form one pole, and the V shape is arranged at substantially equal intervals in the circumferential direction by the number of poles; Since it is provided between the poles of the magnet and has at least an air hole including a shape that is longer in the circumferential direction than the radial direction, the flow of the magnetic flux of the permanent magnet is not hindered between the poles, thus reducing the efficiency. The area of the air hole can be enlarged without any problem.

比較のために示す図で、一般的な永久磁石をＶ字配置した永久磁石埋込型電動機の回転子１００の横断面図。It is a figure shown for comparison and is a cross-sectional view of a rotor 100 of a permanent magnet embedded type motor in which general permanent magnets are arranged in a V shape. 図１の風穴１０３付近の要部拡大図。The principal part enlarged view of the air hole 103 vicinity of FIG. 図１の風穴１０３を大きくした場合の風穴１０３付近の要部拡大図。The principal part enlarged view of the air hole 103 vicinity at the time of enlarging the air hole 103 of FIG. 実施の形態１を示す図で、永久磁石埋込型電動機の回転子２００の横断面図。FIG. 3 shows the first embodiment, and is a cross-sectional view of a rotor 200 of a permanent magnet embedded electric motor. 図４の風穴３付近の要部拡大図。The principal part enlarged view of the wind hole 3 vicinity of FIG. 実施の形態１を示す図で、変形例１の永久磁石埋込型電動機の回転子３００の部分横断面図。FIG. 5 shows the first embodiment, and is a partial cross-sectional view of a rotor 300 of a permanent magnet embedded motor according to a first modification. 図６の風穴３ａ，３ｂ付近の要部拡大図。FIG. 7 is an enlarged view of a main part in the vicinity of the air holes 3a and 3b in FIG. 実施の形態１を示す図で、変形例２の永久磁石埋込型電動機の回転子４００の部分横断面図。FIG. 5 shows the first embodiment, and is a partial cross-sectional view of a rotor 400 of a permanent magnet embedded electric motor according to a second modification. 図８の風穴３ａ，３ｂ付近の要部拡大図。The principal part enlarged view of the air holes 3a and 3b vicinity of FIG. 実施の形態１を示す図で、変形例３の永久磁石埋込型電動機の回転子５００の部分横断面図。FIG. 6 shows the first embodiment, and is a partial cross-sectional view of a rotor 500 of a permanent magnet embedded electric motor according to a third modification. 図１０の風穴３ａ，３ｂ付近の要部拡大図。Fig. 11 is an enlarged view of a main part in the vicinity of the air holes 3a and 3b in Fig. 10.

実施の形態１．
本実施の形態を説明する前に、一般的な永久磁石埋込型電動機の回転子について説明する。 Embodiment 1 FIG.
Before describing this embodiment, a rotor of a general permanent magnet embedded motor will be described.

図１乃至図３は比較のために示す図で、図１は一般的な永久磁石をＶ字配置した永久磁石埋込型電動機の回転子１００の横断面図、図２は図１の風穴１０３付近の要部拡大図、図３は図１の風穴１０３を大きくした場合の風穴１０３付近の要部拡大図である。   FIGS. 1 to 3 are views for comparison. FIG. 1 is a cross-sectional view of a rotor 100 of a permanent magnet embedded motor in which general permanent magnets are arranged in a V shape, and FIG. 2 is an air hole 103 of FIG. FIG. 3 is an enlarged view of a main part in the vicinity of the air hole 103 when the air hole 103 in FIG. 1 is enlarged.

図１に示す一般的な永久磁石埋込型電動機の回転子１００は、４極のものである。回転子１００は、円筒状で中央部に軸孔１０４を有する回転子鉄心１０１、平板状の永久磁石１０２、図示しない永久磁石１０２の抜け止め用の端板等で構成される。永久磁石１０２を挿入した回転子鉄心１０１の軸方向両端に端板を配置し、全体を例えばリベット等により固定する。   The rotor 100 of the general permanent magnet embedded electric motor shown in FIG. The rotor 100 is configured by a rotor core 101 having a cylindrical shape and having a shaft hole 104 in the center, a plate-like permanent magnet 102, an end plate for preventing the permanent magnet 102 not to be removed, and the like. End plates are arranged at both axial ends of the rotor core 101 into which the permanent magnets 102 are inserted, and the whole is fixed by, for example, rivets.

円筒状の回転子鉄心１０１は、厚さ０．１〜１．０ｍｍ程度の薄い電磁鋼板を一枚一枚所定の形状に打ち抜いて、所定の枚数を積層することで構成される。   The cylindrical rotor core 101 is configured by punching out thin electromagnetic steel sheets having a thickness of about 0.1 to 1.0 mm into a predetermined shape one by one and laminating a predetermined number.

円筒状の回転子鉄心１０１は、後述するＶ字配置の永久磁石１０２が挿入される磁石挿入穴（図示せず）、回転子鉄心１０１の中心部に設けられる円形の軸孔１０４、極間に配置される風穴１０３（ここでは、４個）を備える。その他、図示しないが、リベット孔も形成されている。   A cylindrical rotor core 101 includes a magnet insertion hole (not shown) into which a V-shaped permanent magnet 102, which will be described later, is inserted, a circular shaft hole 104 provided in the center of the rotor core 101, and a gap between the poles. Air holes 103 (four in this case) are provided. In addition, although not shown, rivet holes are also formed.

図１に示す一般的な永久磁石埋込型電動機の回転子１００は、一対の断面長方形（平板状）の永久磁石１０２をＶ字形状に配置し、この頂点側を軸孔１０４に向けて永久磁石埋込型電動機の極数（ここでは、４極）分だけ円周方向に等間隔に埋め込んでいる。   A rotor 100 of a general embedded permanent magnet motor shown in FIG. 1 has a pair of rectangular (flat) permanent magnets 102 arranged in a V shape, and the apex side is directed toward a shaft hole 104 to be permanent. The magnet is embedded at equal intervals in the circumferential direction by the number of poles (here, 4 poles) of the magnet-embedded motor.

一対の永久磁石１０２は、断面長方形のｄ軸側を磁極とするため、断面長方形の長辺と直交する方向に着磁している。隣接する一対の永久磁石１０２同士は異極としている。   The pair of permanent magnets 102 are magnetized in a direction orthogonal to the long side of the rectangular cross section because the d axis side of the rectangular cross section is a magnetic pole. A pair of adjacent permanent magnets 102 have different polarities.

上記のように、一対の永久磁石１０２を４極分埋め込んだ永久磁石埋込型電動機の回転子１００により、回転力となるマグネットトルクが発生する。   As described above, a magnet torque serving as a rotational force is generated by the rotor 100 of the embedded permanent magnet electric motor in which the pair of permanent magnets 102 is embedded for four poles.

回転子鉄心１０１において、極間に配置される風穴１０３は、送風機では風を通して冷却する目的で使用される、
また、冷凍空調装置の圧縮機では、風穴１０３は、冷媒、油が通る通路として使用される。 In the rotor core 101, the air holes 103 arranged between the poles are used for the purpose of cooling through the wind in the blower.
Further, in the compressor of the refrigeration air conditioner, the air hole 103 is used as a passage through which refrigerant and oil pass.

即ち、風穴１０３は永久磁石埋込型電動機のトルク（性能）を向上する目的ではなく、流体（空気、冷媒等）を通す目的で用いられることが多い。   That is, the air hole 103 is often used not for the purpose of improving the torque (performance) of the permanent magnet embedded motor but for the purpose of passing a fluid (air, refrigerant, etc.).

そのため、風穴１０３はできるだけ永久磁石埋込型電動機の性能を阻害することない形状と配置とすることが必要となる。   For this reason, the air holes 103 need to be shaped and arranged as much as possible without impeding the performance of the permanent magnet embedded motor.

図２に示すように、永久磁石１０２がＶ字形状に配置され、極間に存在する風穴１０３の形状が円形とすると、磁束（実線矢印）の流れを阻害していることが分かる。   As shown in FIG. 2, when the permanent magnets 102 are arranged in a V shape and the shape of the air hole 103 existing between the poles is circular, it is understood that the flow of magnetic flux (solid arrow) is obstructed.

また、図３に示すように、風穴１０３を円のまま大きくすると、より磁束の流れを阻害し、磁束が流れにくくなり、永久磁石埋込型電動機の効率が低下する。   Moreover, as shown in FIG. 3, if the air hole 103 is enlarged as a circle, the flow of the magnetic flux is further inhibited, the magnetic flux is less likely to flow, and the efficiency of the permanent magnet embedded motor is reduced.

図４乃至図１１は実施の形態１を示す図で、図４は永久磁石埋込型電動機の回転子２００の横断面図、図５は図４の風穴３付近の要部拡大図、図６は変形例１の永久磁石埋込型電動機の回転子３００の部分横断面図、図７は図６の風穴３ａ，３ｂ付近の要部拡大図、図８は変形例２の永久磁石埋込型電動機の回転子４００の部分横断面図、図９は図８の風穴３ａ，３ｂ付近の要部拡大図、図１０は変形例３の永久磁石埋込型電動機の回転子５００の部分横断面図、図１１は図１０の風穴３ａ，３ｂ付近の要部拡大図である。   4 to 11 show the first embodiment. FIG. 4 is a cross-sectional view of the rotor 200 of the permanent magnet embedded motor. FIG. 5 is an enlarged view of the main part in the vicinity of the air hole 3 in FIG. FIG. 7 is a partial cross-sectional view of a rotor 300 of a permanent magnet embedded type electric motor of modification 1, FIG. 7 is an enlarged view of the main part in the vicinity of the air holes 3a and 3b of FIG. 9 is a partial cross-sectional view of the rotor 400 of the electric motor, FIG. 9 is an enlarged view of the main part in the vicinity of the air holes 3a and 3b of FIG. 8, and FIG. 10 is a partial cross-sectional view of the rotor 500 of the permanent magnet embedded type electric motor of the third modification. 11 is an enlarged view of a main part in the vicinity of the air holes 3a and 3b in FIG.

図４に示すように、本実施の形態の永久磁石埋込型電動機の回転子２００は、風穴３以外の構成は図１の一般的な永久磁石埋込型電動機の回転子１００と同じである。   As shown in FIG. 4, the rotor 200 of the permanent magnet embedded motor according to the present embodiment is the same as the rotor 100 of the general permanent magnet embedded motor of FIG. 1 except for the air holes 3. .

即ち、図４に示す本実施の形態の永久磁石埋込型電動機の回転子２００も、４極のものである。回転子２００は、円筒状で中央部に軸孔４を有する回転子鉄心１、平板状の永久磁石２、図示しない永久磁石２の抜け止め用の端板等で構成される。永久磁石２を挿入した回転子鉄心１の軸方向両端に端板を配置し、全体を例えばリベット等により固定する。   That is, the rotor 200 of the permanent magnet embedded type electric motor according to the present embodiment shown in FIG. The rotor 200 includes a rotor core 1 having a cylindrical shape and a shaft hole 4 in the center, a plate-shaped permanent magnet 2, an end plate for preventing the permanent magnet 2 (not shown) from coming off. End plates are arranged at both axial ends of the rotor core 1 in which the permanent magnet 2 is inserted, and the whole is fixed by, for example, rivets.

４極の永久磁石埋込型電動機の回転子２００を一例として説明するが、極数は４極に限定されない。   The rotor 200 of a 4-pole embedded permanent magnet electric motor will be described as an example, but the number of poles is not limited to 4 poles.

円筒状の回転子鉄心１は、厚さ０．１〜１．０ｍｍ程度の薄い電磁鋼板を一枚一枚所定の形状に打ち抜いて、所定の枚数を積層することで構成される。   The cylindrical rotor core 1 is formed by punching thin electromagnetic steel sheets having a thickness of about 0.1 to 1.0 mm into a predetermined shape one by one and laminating a predetermined number.

円筒状の回転子鉄心１は、Ｖ字配置の永久磁石２が挿入される磁石挿入穴（図示せず）、回転子鉄心１の中心部に設けられる円形の軸孔４、極間に配置される風穴３（ここでは、４個）を備える。その他、図示しないが、リベット孔も形成されている。   The cylindrical rotor core 1 is disposed between a magnet insertion hole (not shown) into which a V-shaped permanent magnet 2 is inserted, a circular shaft hole 4 provided at the center of the rotor core 1, and the poles. Air holes 3 (four in this case). In addition, although not shown, rivet holes are also formed.

回転子２００は、一対の断面長方形（平板状）の永久磁石２をＶ字形状に配置し、この頂点側を軸孔４に向けて永久磁石埋込型電動機の極数（ここでは、４極）分だけ円周方向に等間隔に埋め込んでいる。   The rotor 200 has a pair of rectangular permanent magnets 2 (flat plate shape) arranged in a V shape, and the number of poles (in this case, four poles) of the permanent magnet embedded electric motor with the apex side facing the shaft hole 4. ) Are embedded at equal intervals in the circumferential direction.

一対の永久磁石２は、断面長方形のｄ軸側を磁極とするため、断面長方形の長辺と直交する方向に着磁している。隣接する一対の永久磁石２同士は異極としている。   The pair of permanent magnets 2 are magnetized in a direction perpendicular to the long side of the cross-sectional rectangle in order to use the d-axis side of the cross-section rectangle as a magnetic pole. Adjacent pairs of permanent magnets 2 have different polarities.

図４に示すように、極間に存在する風穴３の形状を、永久磁石２から発生する磁束の流れに沿った方向に長い長穴形状にすることにより（図５の拡大図も参照）、図１に示す円形状よりも風穴３の面積が大きく、且つ磁束の流れを阻害しにくい形状にすることができる。   As shown in FIG. 4, by making the shape of the air hole 3 existing between the poles into a long hole shape in the direction along the flow of magnetic flux generated from the permanent magnet 2 (see also the enlarged view of FIG. 5), The area of the air holes 3 is larger than that of the circular shape shown in FIG.

また、別の表現をすれば、極間に存在する風穴３の形状を略円周方向に長い長穴形状とすることにより、磁束の流れを阻害しない形状となり、図１に示す円形状よりも風穴３の面積が大きく、さらに永久磁石埋込型電動機の効率が低下しにくい形状となる。   In other words, by making the shape of the air hole 3 existing between the poles into a long hole shape that is long in the circumferential direction, the shape does not hinder the flow of magnetic flux. The area of the air hole 3 is large, and further, the shape of the permanent magnet embedded electric motor is less likely to decrease.

極間に存在する長穴形状の風穴３は、極間において、回転子鉄心１の外周縁部より離れた軸孔４に近いところに配置する。これにより、永久磁石２の極間における磁束の流れを阻害する恐れが少なくなる。   The long hole-shaped air holes 3 existing between the poles are arranged in the vicinity of the shaft hole 4 far from the outer peripheral edge of the rotor core 1 between the poles. As a result, the possibility of hindering the flow of magnetic flux between the poles of the permanent magnet 2 is reduced.

周方向に長い風穴３の形状を長穴形状で、且つ楕円形状とする事により、永久磁石２の磁束の流れがスムーズになり、より磁束の流れを阻害しない形状となる。   By making the shape of the air hole 3 long in the circumferential direction into a long hole shape and an elliptical shape, the flow of the magnetic flux of the permanent magnet 2 becomes smooth, and the shape does not hinder the flow of the magnetic flux.

さらに周方向両端部が円弧形状であるため（角が面取りされている）、金型の打ち抜き性が向上し、生産性も向上する。   Furthermore, since both ends in the circumferential direction are arc-shaped (the corners are chamfered), the punching performance of the mold is improved and the productivity is also improved.

図６、図７により変形例１の永久磁石埋込型電動機の回転子３００の構成を説明する。   The configuration of the rotor 300 of the permanent magnet embedded electric motor according to the first modification will be described with reference to FIGS.

変形例１の永久磁石埋込型電動機の回転子３００は、図６、図７に示すように、極間に複数の風穴が存在する。例えば、円周方向の長さの長い風穴３ａを軸孔４に近いところに配置する。また、円周方向の長さが風穴３ａより短い風穴３ｂを風穴３ａよりも外側（回転子鉄心１の外周縁部側）に配置する。   As shown in FIGS. 6 and 7, the rotor 300 of the permanent magnet embedded type electric motor of Modification 1 has a plurality of air holes between the poles. For example, the long air hole 3 a in the circumferential direction is disposed near the shaft hole 4. Moreover, the air hole 3b whose circumferential length is shorter than the air hole 3a is arranged outside the air hole 3a (on the outer peripheral edge side of the rotor core 1).

変形例１の回転子３００は、図５に示す回転子２００と比較すると、極間の磁路断面積は小さくなるが、風穴の断面積が大きくなる。そのため、回転子２００を冷却するために風穴を用いる場合は、その冷却効果が高まる。また、圧縮機のように、冷媒の通路として風穴を用いる場合は、冷媒の流路が大きくなる。   Compared with the rotor 200 shown in FIG. 5, the rotor 300 of the first modification has a smaller magnetic path cross-sectional area between the poles but a larger cross-sectional area of the air hole. Therefore, when using an air hole to cool the rotor 200, the cooling effect is enhanced. Further, when the air hole is used as the refrigerant passage as in the compressor, the refrigerant flow path becomes large.

風穴が複数存在する時も、風穴を円周方向に長い長穴形状（例えば、図６、図７の風穴３ａ，３ｂ）とすることにより、磁束の流れを阻害せずに、さらに風穴面積を拡大することができる。   Even when there are a plurality of air holes, by making the air holes have long oblong shapes in the circumferential direction (for example, air holes 3a and 3b in FIGS. 6 and 7), the air hole area can be further increased without hindering the flow of magnetic flux. Can be enlarged.

図８、図９により変形例２の永久磁石埋込型電動機の回転子４００の構成を説明する。   The configuration of the rotor 400 of the permanent magnet embedded motor according to the second modification will be described with reference to FIGS.

変形例２の永久磁石埋込型電動機の回転子４００は、図８、図９に示すように、極間に複数の風穴が存在する。例えば、円周方向の長さの長い風穴３ａを軸孔４に近いところに配置する。また、円形状の風穴３ｃを風穴３ａよりも外側（回転子鉄心１の外周縁部側）に配置する。   As shown in FIGS. 8 and 9, the rotor 400 of the permanent magnet embedded electric motor according to the second modification has a plurality of air holes between the poles. For example, the long air hole 3 a in the circumferential direction is disposed near the shaft hole 4. In addition, the circular air hole 3c is disposed outside the air hole 3a (on the outer peripheral edge side of the rotor core 1).

Ｖ字形状に永久磁石２を配置すると、極間の寸法は回転子内径側（軸孔４側）の方が大きく、回転子内径側に存在する風穴３ａの方が円周方向に長い形状にしやすい。そのため、回転子内径側（軸孔４側）に存在する風穴３ａのみを周方向に長い形状としても、磁束を阻害することなく風穴面積を拡大することが可能である。   When the permanent magnet 2 is arranged in a V shape, the dimension between the poles is larger on the rotor inner diameter side (shaft hole 4 side), and the air holes 3a existing on the rotor inner diameter side are longer in the circumferential direction. Cheap. Therefore, even if only the air hole 3a existing on the rotor inner diameter side (shaft hole 4 side) is formed in a shape that is long in the circumferential direction, the air hole area can be expanded without obstructing the magnetic flux.

変形例２の永久磁石埋込型電動機の回転子４００のように、極間に存在する風穴の一部（風穴３ａ）のみ周方向に長い形状としても、磁束を阻害することなく風穴面積を拡大する効果が得られる。   As with the rotor 400 of the permanent magnet embedded electric motor according to the second modified example, even if only a part of the air holes (air holes 3a) existing between the poles are long in the circumferential direction, the air hole area can be expanded without hindering the magnetic flux. Effect is obtained.

本実施の形態にて説明した周方向に長い風穴３（図４）、風穴３ａ（図６、図８）、風穴３ｂ（図６）は、周方向両端部を円弧形状（角が面取りされている）としたが、角を面取りしないで直線で構成しても同様の効果（生産性も向上を除く）が得られる。   The air holes 3 (FIG. 4), the air holes 3a (FIGS. 6 and 8), and the air holes 3b (FIG. 6) that are long in the circumferential direction described in the present embodiment are arc-shaped (the corners are chamfered). However, the same effect (excluding the improvement in productivity) can be obtained even if it is configured with straight lines without chamfering the corners.

図１０、図１１により変形例３の永久磁石埋込型電動機の回転子５００の構成を説明する。   The structure of the rotor 500 of the permanent magnet embedded type electric motor of Modification 3 will be described with reference to FIGS.

変形例３の永久磁石埋込型電動機の回転子５００は、図１０、図１１に示すように、極間に存在する周方向に長い風穴３ｄの形状を、回転子内径（軸孔４）に沿った円弧形状としている。   As shown in FIGS. 10 and 11, the rotor 500 of the permanent magnet embedded type electric motor of Modification 3 has a shape of the air hole 3 d that is long in the circumferential direction between the poles in the rotor inner diameter (shaft hole 4). It has a circular arc shape along.

極間における磁束の流れは永久磁石２から隣り合う永久磁石２へと流れるため、回転子内径側（軸孔４）は磁束の流れは小さく、風穴を設ける時は内周側に近い方が磁束の流れを妨げる影響が小さい。   Since the flow of magnetic flux between the poles flows from the permanent magnet 2 to the adjacent permanent magnet 2, the flow of magnetic flux is small on the rotor inner diameter side (shaft hole 4). The effect of obstructing the flow is small.

そのため、本実施の形態にて説明した周方向に長い風穴を内径側に近づけることにより、より磁束の流れを阻害しない形状となる。   Therefore, by bringing the long air hole in the circumferential direction described in the present embodiment closer to the inner diameter side, a shape that does not hinder the flow of magnetic flux is obtained.

風穴を内径側に近づけ、より風穴面積を大きくするためには、風穴の形状を内径（軸孔４）に沿った円弧形状（風穴３ｄ）とすればよい。   In order to bring the air hole closer to the inner diameter side and further increase the air hole area, the shape of the air hole may be an arc shape (air hole 3d) along the inner diameter (shaft hole 4).

そのため、風穴３ｄのように内径（軸孔４）に沿った円弧形状とすることにより、より風穴面積の拡大が可能であり、さらに磁束の流れを阻害しにくい形状となる。   Therefore, by making the arc shape along the inner diameter (shaft hole 4) like the air hole 3d, the area of the air hole can be further increased and the flow of the magnetic flux is hardly hindered.

また、風穴３ｄと内径（軸孔４）との間の寸法を円周方向に略一定にして風穴３ｄを配置することにより、より風穴面積の拡大が可能である。   Further, by arranging the air hole 3d with the dimension between the air hole 3d and the inner diameter (shaft hole 4) being substantially constant in the circumferential direction, the air hole area can be further increased.

本実施の形態における回転子２００〜５００の風穴は、極間に存在する風穴の関するものであるが、他の部分（極間以外）に風穴があっても関係しない。また極間以外に存在する風穴の形状や個数に関係なく効果が得られる。   The air holes of the rotors 200 to 500 in the present embodiment relate to the air holes existing between the poles, but are not related even if there are air holes in other parts (other than the gaps). In addition, the effect can be obtained regardless of the shape and number of the air holes other than the gaps.

実施の形態２．
実施の形態１の回転子２００〜５００を電動機（例えば、永久磁石埋込型電動機）に用いることにより、高効率で低コストな電動機を得ることができる。 Embodiment 2. FIG.
By using the rotors 200 to 500 of the first embodiment for an electric motor (for example, an embedded permanent magnet electric motor), a highly efficient and low-cost electric motor can be obtained.

また、永久磁石２に焼結希土類磁石を使用すると、焼結希土類磁石は高磁力のため、回転子の磁束密度が他の磁石を使用した時よりも高くなり、極間に存在する風穴の影響が大きくなる。   In addition, when a sintered rare earth magnet is used for the permanent magnet 2, the sintered rare earth magnet has a high magnetic force, so that the magnetic flux density of the rotor is higher than when other magnets are used, and the influence of the air holes existing between the poles. Becomes larger.

そのため、回転子に焼結希土類磁石を使用する時、実施の形態１の回転子２００〜５００を用いることにより、磁束の流れを阻害せずに風穴面積の拡大する効果が高まる。   Therefore, when using a sintered rare earth magnet for the rotor, by using the rotors 200 to 500 of the first embodiment, the effect of expanding the air hole area without hindering the flow of magnetic flux is enhanced.

また、実施の形態１に示す回転子を用いた電動機（例えば、永久磁石埋込型電動機）は、効率の低下なく風穴面積を増加することが可能であり、流路の確保、冷却性向上が可能となり、経年変化が小さくなり、長寿命な電動機が得られる。   Further, the electric motor using the rotor shown in the first embodiment (for example, a permanent magnet embedded electric motor) can increase the air hole area without lowering the efficiency, and can secure the flow path and improve the cooling performance. It becomes possible, the secular change is reduced, and a long-life motor is obtained.

また、実施の形態１に示す回転子を用いた電動機（例えば、永久磁石埋込型電動機）を、冷凍サイクル装置等の圧縮機、空気調和機等の送風機に搭載することにより、高効率で低コスト、長寿命な圧縮機、送風機が得られる。   In addition, by mounting the electric motor using the rotor shown in the first embodiment (for example, a permanent magnet embedded electric motor) on a compressor such as a refrigeration cycle apparatus or a blower such as an air conditioner, the efficiency is low. Cost, long-life compressor and blower can be obtained.

１ 回転子鉄心、２ 永久磁石、３ 風穴、３ａ 風穴、３ｂ 風穴、３ｃ 風穴、３ｄ 風穴、４ 軸孔、１００ 回転子、１０１ 回転子鉄心、１０２ 永久磁石、１０３ 風穴、１０４ 軸孔、２００ 回転子、３００ 回転子、４００ 回転子、５００ 回転子。   1 Rotor core, 2 permanent magnet, 3 air holes, 3a air hole, 3b air hole, 3c air hole, 3d air hole, 4 shaft hole, 100 rotor, 101 rotor core, 102 permanent magnet, 102 air hole, 104 shaft hole, 200 rotation Child, 300 rotor, 400 rotor, 500 rotor.

Claims (10)

所定の形状に打ち抜いた電磁鋼板を所定の枚数積層することにより構成される回転子鉄心と、
前記回転子鉄心の略中心部に設けられる軸孔と、
前記回転子鉄心に設けられ、頂点側を前記軸孔に向けてＶ字形状に配置されて一極を形成し、前記Ｖ字形状を極数分だけ円周方向に略等間隔に配置される永久磁石と、
前記永久磁石の極間に設けられ、少なくとも径方向よりも周方向に長い形状のものを含む風穴と、を備えたことを特徴とする電動機の回転子。 A rotor core constructed by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape;
A shaft hole provided at a substantially central portion of the rotor core;
Provided on the rotor core, arranged in a V shape with the apex side facing the shaft hole to form one pole, and the V shape is arranged at substantially equal intervals in the circumferential direction by the number of poles. With permanent magnets,
A rotor for an electric motor comprising: an air hole provided between poles of the permanent magnet and including at least a shape longer in the circumferential direction than in the radial direction. 前記径方向よりも周方向に長い形状の風穴を、楕円形状としたことを特徴とする請求項１記載の電動機の回転子。   The rotor for an electric motor according to claim 1, wherein the air hole having a shape longer in the circumferential direction than the radial direction has an elliptical shape. 前記極間に前記風穴が複数存在することを特徴とする請求項１又は請求項２記載の電動機の回転子。   The electric motor rotor according to claim 1, wherein a plurality of the air holes exist between the poles. 前記極間に存在する複数の前記風穴の中、前記軸孔側に位置する前記風穴を径方向よりも周方向に長い形状とし、当該回転子の外径側に位置する前記風穴を円形状とすることを特徴とする請求項３記載の電動機の回転子。   Among the plurality of air holes existing between the poles, the air hole located on the shaft hole side is longer in the circumferential direction than the radial direction, and the air hole located on the outer diameter side of the rotor is circular The rotor of the electric motor according to claim 3, wherein 前記径方向よりも周方向に長い形状の風穴を、前記軸孔に沿った形状とすることを特徴とする請求項１乃至４のいずれかに記載の電動機の回転子。   5. The rotor of an electric motor according to claim 1, wherein an air hole having a shape longer in a circumferential direction than the radial direction is formed along the shaft hole. 前記径方向よりも周方向に長い形状の風穴と前記軸孔との間の寸法を円周方向に略一定にすることを特徴とする請求項５記載の電動機の回転子。   6. The rotor of an electric motor according to claim 5, wherein a dimension between the air hole longer in the circumferential direction than the radial direction and the shaft hole is made substantially constant in the circumferential direction. 前記永久磁石を希土類磁石で構成することを特徴とする請求項１乃至６のいずれかに記載の電動機の回転子。   The rotor of an electric motor according to any one of claims 1 to 6, wherein the permanent magnet is composed of a rare earth magnet. 請求項１乃至７のいずれかに記載の電動機の回転子を備えたことを特徴とする電動機。   An electric motor comprising the rotor of the electric motor according to claim 1. 請求項８に記載の電動機を備えたことを特徴とする送風機。   A blower comprising the electric motor according to claim 8. 請求項８に記載の電動機を備えたことを特徴とする圧縮機。   A compressor comprising the electric motor according to claim 8.
JP2009027384A 2009-02-09 2009-02-09 Rotor of electric motor, electric motor, air blower and compressor Pending JP2010183800A (en)

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