JP2013255326A - Permanent magnet synchronous machine - Google Patents
Permanent magnet synchronous machine Download PDFInfo
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- JP2013255326A JP2013255326A JP2012128786A JP2012128786A JP2013255326A JP 2013255326 A JP2013255326 A JP 2013255326A JP 2012128786 A JP2012128786 A JP 2012128786A JP 2012128786 A JP2012128786 A JP 2012128786A JP 2013255326 A JP2013255326 A JP 2013255326A
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
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Abstract
Description
本発明は永久磁石同期機に関するものである。 The present invention relates to a permanent magnet synchronous machine.
永久磁石同期機では、回転子に永久磁石を埋設するInterior Permanent Magnet（以下「ＩＰＭ」という。）構造が広く採用されている。ＩＰＭ構造の永久磁石同期機に埋設する永久磁石に、安価でかつ安定調達が可能なフェライト磁石が採用され始めている。 In the permanent magnet synchronous machine, an interior permanent magnet (hereinafter referred to as “IPM”) structure in which a permanent magnet is embedded in a rotor is widely adopted. Ferrite magnets that are inexpensive and can be stably procured have begun to be used for permanent magnets embedded in permanent magnet synchronous machines having an IPM structure.
しかしながら、永久磁石の性能は残留磁束密度と保持力という２つの物理量で表され、フェライト磁石の残留磁束密度及び保持力は、ネオジウム磁石の約１／３である。従って、現在広く使用されているネオジウム磁石をフェライト磁石に置き換えた場合、著しい性能の低下を招くことになる。 However, the performance of a permanent magnet is expressed by two physical quantities, ie, residual magnetic flux density and coercive force, and the residual magnetic flux density and coercive force of a ferrite magnet are about 1/3 of a neodymium magnet. Therefore, when a neodymium magnet that is widely used at present is replaced with a ferrite magnet, the performance is significantly reduced.
特許文献１は、記永久磁石を埋め込む収容孔が略凹字状であって、回転子外周面側を広く回転子内径側に向い狭くした収容孔を有する永久磁石埋め込み回転子を開示している。特許文献１によれば、磁石磁束の発生面積を大きくするとともに、永久磁石の径方向外周部の鉄心断面積を大きくすることで、リラクタンストルクを積極的に活用して性能の向上を図っている。 Patent Document 1 discloses a permanent magnet-embedded rotor having an accommodation hole in which the permanent magnet is embedded in a substantially concave shape, and has an accommodation hole in which the outer peripheral surface of the rotor is widened toward the inner diameter of the rotor. . According to Patent Literature 1, while increasing the magnetic flux generation area and increasing the core cross-sectional area of the radial outer periphery of the permanent magnet, the reluctance torque is actively utilized to improve performance. .
ＩＰＭ構造の永久磁石同期機は、回転子で永久磁石を保持するために、リブと呼ばれる継鉄部を永久磁石収容孔の外周側に設けられている。 In the permanent magnet synchronous machine having the IPM structure, a yoke portion called a rib is provided on the outer peripheral side of the permanent magnet accommodation hole in order to hold the permanent magnet by the rotor.
回転子が回転すると、永久磁石及び回転子鉄心に遠心力が働く。この遠心力が曲げモーメントとなってリブに作用する。従って、回転時に破断及び変形しない強度をリブに持たせるために、リブの幅を広くする必要がある。 When the rotor rotates, centrifugal force acts on the permanent magnet and the rotor core. This centrifugal force acts as a bending moment on the rib. Therefore, in order to give the rib strength that does not break or deform during rotation, it is necessary to widen the width of the rib.
一方、永久磁石の磁束には、リブへと漏れて、トルクを発生させない漏れ磁束が存在する。この漏れ磁束の量はリブが磁気飽和するまで増大する。言い換えると、リブが磁気飽和を引き起こす磁束が漏れ磁束となる。永久磁石にフェライト磁石のような残留磁束密度の低い磁石を採用した場合、リブが磁気飽和を引き起こすまでに比較的大きな割合の漏れ磁束が必要となり、相対的に主磁束が減少する。そのため、リブへの漏れ磁束の割合を減らすためには、リブの幅を狭くする必要がある。 On the other hand, in the magnetic flux of the permanent magnet, there exists a leakage magnetic flux that leaks to the rib and does not generate torque. The amount of leakage flux increases until the rib is magnetically saturated. In other words, the magnetic flux that causes the magnetic saturation of the rib becomes the leakage magnetic flux. When a magnet having a low residual magnetic flux density such as a ferrite magnet is adopted as the permanent magnet, a relatively large proportion of leakage magnetic flux is required before the rib causes magnetic saturation, and the main magnetic flux is relatively reduced. Therefore, in order to reduce the ratio of the leakage magnetic flux to the rib, it is necessary to narrow the width of the rib.
つまり、リブの強度を確保するためにリブの幅を広くすることと、リブへの漏れ磁束の割合を減らすためにリブの幅を狭くすることとは相反する関係にある。そのため、特許文献１の回転子の構造では、リブの強度を確保するためにリブの幅を広くしなければならず、漏れ磁束が増加する。 That is, there is a contradictory relationship between increasing the width of the rib to ensure the strength of the rib and decreasing the width of the rib to reduce the ratio of leakage magnetic flux to the rib. Therefore, in the structure of the rotor of Patent Document 1, in order to ensure the strength of the rib, the width of the rib has to be widened, and the leakage magnetic flux increases.
本発明は、リブの強度を確保しつつ、漏れ磁束を低減することを目的とする。 An object of this invention is to reduce a leakage magnetic flux, ensuring the intensity | strength of a rib.
本発明の永久磁石同期機は、径方向内側に凸となるよう構成され、永久磁石が配設される磁石収容孔と、磁石収容孔の径方向外周側に位置する回転子鉄心と、回転子鉄心の極間側、且つ、磁石収容孔の径方向外周側に位置するリブと、磁石収容孔及びリブの極間側に位置する連結部と、を備え、リブは、連結部側に位置する連結部側リブと、回転子鉄心側に位置する回転子鉄心側リブと、連結部側リブ及び回転子鉄心側リブの間に位置する中央リブと、から構成され、連結部側リブの幅は中央リブの幅より広い。 A permanent magnet synchronous machine according to the present invention is configured to protrude radially inward, a magnet housing hole in which a permanent magnet is disposed, a rotor core positioned on the radially outer side of the magnet housing hole, and a rotor A rib positioned on the inter-electrode side of the iron core and on the outer peripheral side in the radial direction of the magnet housing hole; and a connecting portion positioned on the inter-electrode side of the magnet housing hole and the rib. The rib is positioned on the connecting portion side. It is composed of a connecting part side rib, a rotor core side rib located on the rotor core side, and a central rib located between the connecting part side rib and the rotor core side rib, and the width of the connecting part side rib is It is wider than the width of the central rib.
本発明によれば、リブの強度を確保しつつ、漏れ磁束を低減することができる。 According to the present invention, it is possible to reduce the leakage magnetic flux while ensuring the strength of the rib.
以下、本発明の実施例について図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図１は、本発明の第１の実施例における永久磁石同期機の全体図である。永久磁石同期機は回転子１と固定子３０とから構成される。回転子１は、径方向内側に凸となるよう構成された永久磁石収容孔４と、永久磁石収容孔４の径方向外周側に位置する回転子鉄心２と、回転子鉄心２の極間側で、且つ、永久磁石収容孔４の径方向外周側に位置するリブ６を有している。 FIG. 1 is an overall view of a permanent magnet synchronous machine according to a first embodiment of the present invention. The permanent magnet synchronous machine includes a rotor 1 and a stator 30. The rotor 1 includes a permanent magnet housing hole 4 configured to protrude radially inward, a rotor core 2 located on the radially outer side of the permanent magnet housing hole 4, and a pole-to-pole side of the rotor core 2. And the rib 6 located in the radial direction outer peripheral side of the permanent magnet accommodation hole 4 is provided.
図２は、本発明の第１の実施例における永久磁石同期機の１極分の部分断面図である。永久磁石収容孔４には永久磁石３が配設される。永久磁石収容孔４と隣の極の永久磁石収容孔４とは、連結部１１で連結される。 FIG. 2 is a partial cross-sectional view of one pole of the permanent magnet synchronous machine in the first embodiment of the present invention. The permanent magnet 3 is disposed in the permanent magnet accommodation hole 4. The permanent magnet accommodation hole 4 and the adjacent permanent magnet accommodation hole 4 are connected by a connecting portion 11.
通常、永久磁石３から発生する磁束は、回転子鉄心２を透過し、回転子１と固定子３０との間の空間（以下「ギャップ３１」という。）３１を介して固定子３０へ透過して、トルクを発生させる。このトルクの発生に寄与する磁束は主磁束または有効磁束と呼ばれる。 Normally, the magnetic flux generated from the permanent magnet 3 passes through the rotor core 2, and passes through the space (hereinafter referred to as “gap 31”) 31 between the rotor 1 and the stator 30 to the stator 30. To generate torque. The magnetic flux that contributes to the generation of this torque is called the main magnetic flux or effective magnetic flux.
一方、リブ６に隣接する永久磁石の磁束は、ギャップ３１と比較して磁気抵抗が相対的に小さいリブ６へと漏れて、トルクを発生させない。このため、トルクの発生に寄与しない磁束は漏れ磁束と呼ばれる。 On the other hand, the magnetic flux of the permanent magnet adjacent to the rib 6 leaks to the rib 6 having a relatively small magnetic resistance compared to the gap 31 and does not generate torque. For this reason, the magnetic flux that does not contribute to the generation of torque is called leakage magnetic flux.
リブ６が漏れ磁束９によって磁気飽和するとギャップ３１と同程度の磁気抵抗となる。すなわち、漏れ磁束９が一定の水準に達すると残りの磁束はギャップ３１を透過する主磁束１０となる。 When the rib 6 is magnetically saturated by the leakage magnetic flux 9, the magnetic resistance becomes the same as that of the gap 31. That is, when the leakage magnetic flux 9 reaches a certain level, the remaining magnetic flux becomes the main magnetic flux 10 that passes through the gap 31.
永久磁石３は、１極につき周方向に分割されることなく一体で構成され、１極につき周方向に少なくとも２ヶ所の屈曲点４２ａ、４２ｂを有する。側部４１ａ、４１ｂは、屈曲点４２ａ、４２ｂを始端として磁化方向に対して垂直方向かつ極の端部側に向けて伸びる。 The permanent magnet 3 is integrally formed without being divided in the circumferential direction per pole, and has at least two bending points 42a and 42b in the circumferential direction per pole. The side portions 41a and 41b extend from the bending points 42a and 42b as the starting ends in a direction perpendicular to the magnetization direction and toward the end portions of the poles.
ここで、永久磁石収容孔４の極間側の端部において、極中央側の永久磁石収容孔４の外周側端部から回転子１の端までの長さ（以下「リブ６ｂの幅」という。）Ｌ１、極間側の永久磁石収容孔４の外周側端部から回転子１の外周側端までの長さ（以下「リブ６ｃの幅」という。）Ｌ２、リブ６の直線方向の中点における永久磁石収容孔４の外周側端部から回転子１の外周側端までの長さ（以下「リブ６ａの幅」という。）Ｌ０とする。 Here, at the end portion between the poles of the permanent magnet housing hole 4, the length from the outer peripheral side end portion of the permanent magnet housing hole 4 on the pole center side to the end of the rotor 1 (hereinafter referred to as “the width of the rib 6 b”). .) L1, the length from the outer peripheral side end of the permanent magnet housing hole 4 on the pole-to-pole side to the outer peripheral side end of the rotor 1 (hereinafter referred to as “width of the rib 6c”) L2, in the linear direction of the rib 6 The length from the outer peripheral side end of the permanent magnet housing hole 4 to the outer peripheral side end of the rotor 1 at the point (hereinafter referred to as “the width of the rib 6a”) L0.
回転子１が回転すると、永久磁石３及び回転子鉄心２に遠心力が働く。この遠心力に対し、両端に位置する連結部１１が支点、両端に位置するリブ６が梁として機能する。リブ６ｃはリブ６ａ、６ｂに比べて支点である連結部１１に近いため、リブ６ｃに加わる曲げモーメントはリブ６ａ、６ｂに比べて大きい。従って、図４に示すようにリブ６ｃでの応力集中はリブ６ａよりも大きい。 When the rotor 1 rotates, centrifugal force acts on the permanent magnet 3 and the rotor core 2. With respect to this centrifugal force, the connecting portions 11 located at both ends function as fulcrums and the ribs 6 located at both ends function as beams. Since the rib 6c is closer to the connecting portion 11 as a fulcrum than the ribs 6a and 6b, the bending moment applied to the rib 6c is larger than that of the ribs 6a and 6b. Therefore, as shown in FIG. 4, the stress concentration on the rib 6c is larger than that of the rib 6a.
本実施例では、リブ６に作用する曲げモーメントの分布に応じて、リブ６ｃの幅Ｌ２をリブ６ａの幅Ｌ０よりも広くすることで、リブ６ｃの剛性をリブ６ａよりも高めている。 In the present embodiment, the rigidity of the rib 6c is made higher than that of the rib 6a by making the width L2 of the rib 6c wider than the width L0 of the rib 6a according to the distribution of the bending moment acting on the rib 6.
一方、リブ６ｂは回転子鉄心２と連結する位置にあるため、幅が急激に変化する。そのため、リブ６ｂ付近に応力が集中し、局所的に高い応力が加わる。従って、図４に示すようにリブ６ｂでの応力集中はリブ６ａよりも大きい。 On the other hand, since the rib 6b is in a position where it is connected to the rotor core 2, the width changes abruptly. Therefore, stress concentrates near the rib 6b, and high stress is locally applied. Therefore, as shown in FIG. 4, the stress concentration in the rib 6b is larger than that in the rib 6a.
そこで、本実施例では、リブ６ｂの幅Ｌ１をリブ６ａの幅Ｌ０よりも広くしているため、リブ６の形状が急激に変化することを防止し、応力集中を避けている。 Therefore, in the present embodiment, since the width L1 of the rib 6b is wider than the width L0 of the rib 6a, the shape of the rib 6 is prevented from changing suddenly and stress concentration is avoided.
このように、リブ６に作用する力に応じてリブ６の幅を調節することで、必要以上にリブ６の全体の幅を広げることを避け、リブ６の幅を一律にするよりも漏れ磁束の割合を低減することができる。 In this way, by adjusting the width of the rib 6 according to the force acting on the rib 6, it is possible to avoid widening the entire width of the rib 6 more than necessary, and to leak the magnetic flux more than to make the width of the rib 6 uniform. Can be reduced.
なお、リブ６ｂの幅Ｌ１をリブ６ａの幅Ｌ０よりも広くすることと、リブ６ｃの幅Ｌ２をリブ６ａの幅Ｌ０よりも広くすることのどちらか一方のみを採用してもよい。 Only one of the width L1 of the rib 6b larger than the width L0 of the rib 6a and the width L2 of the rib 6c larger than the width L0 of the rib 6a may be employed.
さらに、本実施例で採用した径方向内側に凸となる永久磁石収容孔４は、直線形状の磁石収容孔に比べて、回転子鉄心２の径方向における幅は大きい。そのため、回転子鉄心２とリブ６との間では径方向における幅が急激に変化するので、６ｂ付近により応力が集中する。従って、本実施例では、リブ６ｂの幅Ｌ１をリブ６ｃの幅Ｌ２よりも広くし、リブ６の直線方向の中点から極中央側までのリブ６の面積Ａ１をリブ６の直線方向の中点から極間側までのリブ６の面積Ａ２よりも大きくしている。 Furthermore, the width of the rotor core 2 in the radial direction of the permanent magnet housing hole 4 that is convex inward in the radial direction employed in this embodiment is larger than that of the linear magnet housing hole. For this reason, since the width in the radial direction changes abruptly between the rotor core 2 and the rib 6, the stress is concentrated in the vicinity of 6b. Therefore, in this embodiment, the width L1 of the rib 6b is made larger than the width L2 of the rib 6c, and the area A1 of the rib 6 from the midpoint of the rib 6 in the linear direction to the pole center side is It is larger than the area A2 of the rib 6 from the point to the inter-electrode side.
さらに、永久磁石収容孔４の極間側の端部において、極中央側を半径Ｒ１の円弧とし、極間側を半径Ｒ２の円弧とすることで、曲げモーメント及び応力集中に応じてリブ６の幅を調節している。 Further, at the end portion between the poles of the permanent magnet housing hole 4, the pole center side is an arc having a radius R1, and the pole side is an arc having a radius R2, so that the rib 6 The width is adjusted.
また、半径Ｒ１と半径Ｒ２の合計値を磁石の磁化方向厚みＴ２よりも小さくすることで、リブ６に直線部分を設け、リブ６ａへの応力集中を避けている。 Further, by making the total value of the radius R1 and the radius R2 smaller than the magnetization direction thickness T2 of the magnet, a straight portion is provided in the rib 6 to avoid stress concentration on the rib 6a.
また、回転子１には、回転子鉄心２の径方向外周側に突出部１２が設けられている。突出部１２を設けることで、リブ６ｂの幅Ｌ１をさらに広げることができ、応力が集中するリブ６ｂの剛性を高めている。突出部１２の径方向外周側の幅はリブ６ｂの幅Ｌ１の半分以下としており、突出部１２を設けたことにより、リブ６ｂに応力が集中するのを避けている。 Further, the rotor 1 is provided with a protruding portion 12 on the radially outer peripheral side of the rotor core 2. By providing the protruding portion 12, the width L1 of the rib 6b can be further increased, and the rigidity of the rib 6b where stress concentrates is increased. The width of the projecting portion 12 on the outer peripheral side in the radial direction is set to be equal to or less than half of the width L1 of the rib 6b, and by providing the projecting portion 12, it is avoided that stress is concentrated on the rib 6b.
また、突出部１２を設けることで、鉄心断面積が大きくなり、リラクタンストルクを増加させることもできる。 Moreover, by providing the protrusion part 12, an iron core cross-sectional area becomes large and a reluctance torque can also be increased.
なお、さらなるリラクタンストルクの増加を図るために、突出部１２の径方向外周側の幅をリブ６ｂの幅Ｌ１の半分以上にしてもよい。 In order to further increase the reluctance torque, the width of the protruding portion 12 on the outer peripheral side in the radial direction may be made more than half the width L1 of the rib 6b.
また、回転子鉄心２は、軸方向に積み重ねた積層鋼板、圧粉磁心、又は、アモルファス金属などで構成される。 The rotor core 2 is composed of laminated steel plates, dust cores, or amorphous metals stacked in the axial direction.
また、永久磁石３の側部４１ａ、４１ｂは磁化方向に対して垂直方向かつ極の端部側に向けて伸びる構造である場合について説明したが、径方向内側に凸となるよう湾曲させる湾曲構造としてもよい。又は、側部４１ａ、４１ｂは径方向内側に凸となるよう複数の側部で構成するようにしてもよい。 Moreover, although the side parts 41a and 41b of the permanent magnet 3 demonstrated the case where it was a structure perpendicular | vertical with respect to a magnetization direction and extended toward the edge part side of a pole, the curved structure curved so that it may become convex inside radial direction It is good. Or you may make it comprise the side parts 41a and 41b by a some side part so that it may protrude in the radial direction inner side.
また、永久磁石３の屈曲点４２と回転子鉄心２との接触点４５、４６は、円弧で構成してもよいし、折れ線状に構成しても良い。 In addition, the contact points 45 and 46 between the bending point 42 of the permanent magnet 3 and the rotor core 2 may be formed in an arc or a polygonal line.
また、永久磁石３としてフェライト磁石を例に挙げているが、フェライト磁石のみに限定されるものではない。 Moreover, although the ferrite magnet is mentioned as an example as the permanent magnet 3, it is not limited only to a ferrite magnet.
また、内転型回転子について説明したが、外転型回転子にも適用可能である。 Moreover, although the inner rotation type rotor has been described, the present invention can also be applied to an outer rotation type rotor.
図３は、本発明の第２の実施例による永久磁石同期機の１極分の部分断面図である。 FIG. 3 is a partial cross-sectional view of one pole of a permanent magnet synchronous machine according to a second embodiment of the present invention.
極の中央部４０における磁化方向クリアランス８ａの幅Ｔ１は、側部４１ａ、４１ｂにおける磁化方向クリアランス８ｂの幅Ｔ２よりも広い。 The width T1 of the magnetization direction clearance 8a in the central portion 40 of the pole is wider than the width T2 of the magnetization direction clearance 8b in the side portions 41a and 41b.
永久磁石３には遠心力が働き、曲げモーメントとなってリブ６に作用する。磁化方向クリアランス８ａの幅Ｔ１を磁化方向クリアランス８ｂの幅Ｔ２よりも広くすることで、永久磁石３の中央部４０に働く遠心力は、側部４１ａ、４１ｂを介して回転子鉄心２に働く。 Centrifugal force acts on the permanent magnet 3 and acts on the rib 6 as a bending moment. By making the width T1 of the magnetization direction clearance 8a wider than the width T2 of the magnetization direction clearance 8b, the centrifugal force acting on the central portion 40 of the permanent magnet 3 acts on the rotor core 2 via the side portions 41a and 41b.
側部４１ａ、４１ｂは中央部４０よりも連結部１１に近い位置にある。そのため、永久磁石３の中央部４０の遠心力によるリブ６に働く曲げモーメントを弱めることができる。従って、リブ６の強度に余裕ができるため、リブ幅を狭くして、リブ６への漏れ磁束の割合を低減することができる。 The side portions 41 a and 41 b are located closer to the connecting portion 11 than the central portion 40. Therefore, the bending moment acting on the rib 6 due to the centrifugal force of the central portion 40 of the permanent magnet 3 can be weakened. Therefore, since the strength of the rib 6 can be afforded, the rib width can be narrowed and the ratio of the leakage magnetic flux to the rib 6 can be reduced.
さらに、永久磁石３の側部４１ａ、４１ｂの直線長さＷ２を中央部４０の直線長さＷ１よりも長くすることで、連結部１１に近い場所に位置する永久磁石３の割合を増やすことができる。そのため、永久磁石３の遠心力によるリブ６に働く曲げモーメントを弱めることができ、リブ幅を狭くしてリブ６への漏れ磁束の割合を低減することができる。 Furthermore, by increasing the linear length W2 of the side portions 41a and 41b of the permanent magnet 3 to be longer than the linear length W1 of the central portion 40, the proportion of the permanent magnet 3 located near the connecting portion 11 can be increased. it can. Therefore, the bending moment acting on the rib 6 due to the centrifugal force of the permanent magnet 3 can be weakened, the rib width can be narrowed, and the ratio of the leakage magnetic flux to the rib 6 can be reduced.
なお、磁化方向クリアランス８ａの幅Ｔ１を磁化方向クリアランス８ｂの幅Ｔ２よりも広くすることと、永久磁石３の側部４１ａ、４１ｂの直線長さＷ２を中央部４０の直線長さＷ１よりも長くすることとは併用せずに、どちらかのみを採用する構造としてもよい。 The width T1 of the magnetization direction clearance 8a is made wider than the width T2 of the magnetization direction clearance 8b, and the linear length W2 of the side portions 41a and 41b of the permanent magnet 3 is longer than the linear length W1 of the central portion 40. It is good also as a structure which employ | adopts only either, without using together.
以上説明したとおり、本発明の永久磁石同期機は、径方向内側に凸となるよう構成され、永久磁石が配設される磁石収容孔と、磁石収容孔の径方向外周側に位置する回転子鉄心と、回転子鉄心の極間側、且つ、磁石収容孔の径方向外周側に位置するリブと、磁石収容孔及びリブの極間側に位置する連結部と、を備え、リブは、連結部側に位置する連結部側リブと、回転子鉄心側に位置する回転子鉄心側リブと、連結部側リブ及び回転子鉄心側リブの間に位置する中央リブと、から構成され、連結部側リブの幅は中央リブの幅より広い。 As described above, the permanent magnet synchronous machine of the present invention is configured to protrude radially inward, and includes a magnet housing hole in which the permanent magnet is disposed, and a rotor located on the radially outer side of the magnet housing hole. An iron core, a rotor core and a rib positioned on the outer peripheral side in the radial direction of the magnet housing hole, and a connecting portion positioned on the magnet housing hole and the interelectrode side of the rib, the rib being connected A connecting part side rib located on the part side, a rotor core side rib located on the rotor core side, and a central rib located between the connecting part side rib and the rotor core side rib, the connecting part The width of the side rib is wider than the width of the central rib.
また、本発明の永久磁石同期機は、回転子鉄心側リブの幅は中央リブの幅より広い。 In the permanent magnet synchronous machine of the present invention, the width of the rotor core side rib is wider than the width of the central rib.
また、本発明の永久磁石同期機は、回転子鉄心側リブの幅は連結部側リブの幅よりも広い。 In the permanent magnet synchronous machine of the present invention, the width of the rotor core side rib is wider than the width of the connecting portion side rib.
また、本発明の永久磁石同期機は、磁石収容孔の極間側端部において、極中央側の形状を半径Ｒ１の円弧とし、極間側の形状を半径Ｒ２の円弧とし、半径Ｒ１と半径Ｒ２の合計値が永久磁石の磁化方向厚みよりも小さい。 Further, in the permanent magnet synchronous machine of the present invention, at the end portion between the poles of the magnet accommodation hole, the shape at the pole center side is an arc with a radius R1, the shape between the poles is an arc with a radius R2, and the radius R1 and the radius The total value of R2 is smaller than the thickness in the magnetization direction of the permanent magnet.
また、本発明の永久磁石同期機は、回転子鉄心側リブ及び回転子鉄心の径方向外径側に位置する突出部を備える。 Moreover, the permanent magnet synchronous machine of this invention is provided with the protrusion part located in the radial direction outer-diameter side of a rotor core side rib and a rotor core.
また、本発明の永久磁石同期機は、永久磁石は、中央部と、中央部の両端に位置する側部と、を有し、中央部の磁化方向のクリアランスが側部の磁化方向のクリアランスよりも大きい。 In the permanent magnet synchronous machine of the present invention, the permanent magnet has a central portion and side portions located at both ends of the central portion, and the clearance in the magnetization direction of the central portion is larger than the clearance in the magnetization direction of the side portion. Is also big.
また、本発明の永久磁石同期機は、永久磁石は、中央部と、中央部の両端に位置する側部と、を有し、側部の磁化方向と垂直方向の長さが中央部の直線長さよりも長い。 In the permanent magnet synchronous machine of the present invention, the permanent magnet has a central portion and side portions located at both ends of the central portion, and the length in the direction perpendicular to the magnetization direction of the side portion is a straight line with the central portion. Longer than the length.
１ 回転子
２ 回転子鉄心
３ 永久磁石
４ 永久磁石挿入孔
５ シャフト孔
６ リブ
７ 極間側端部クリアランス
８ 磁化方向クリアランス
９ 漏れ磁束
１０ 主磁束
１１ 連結部
３０ 固定子
３１ ギャップ
４１ 側部
４２ 屈曲点
４５、４６ 屈曲点４２と回転子鉄心２との接触点
７１ 遠心力７０の作用点
７２ 応力集中部７３から作用点７１までの距離
７３ 応力集中部
DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor core 3 Permanent magnet 4 Permanent magnet insertion hole 5 Shaft hole 6 Rib 7 Electrode side end clearance 8 Magnetization direction clearance 9 Leakage magnetic flux 10 Main magnetic flux 11 Connection part 30 Stator 31 Gap 41 Side part 42 Bending Points 45 and 46 Contact point 71 between the bending point 42 and the rotor core 2 Action point 72 of the centrifugal force 70 Distance 73 from the stress concentration part 73 to the action point 71 Stress concentration part
Claims (7)
前記磁石収容孔の径方向外周側に位置する回転子鉄心と、
前記回転子鉄心の極間側、且つ、前記磁石収容孔の径方向外周側に位置するリブと、
前記磁石収容孔及び前記リブの極間側に位置する連結部と、を備え、
前記リブは、
前記連結部側に位置する連結部側リブと、
前記回転子鉄心側に位置する回転子鉄心側リブと、
前記連結部側リブ及び前記回転子鉄心側リブの間に位置する中央リブと、
から構成され、
前記連結部側リブの幅は前記中央リブの幅より広い永久磁石同期機。 A magnet housing hole configured to be convex radially inward and having a permanent magnet disposed thereon;
A rotor core located on the radially outer side of the magnet housing hole;
A rib located between the poles of the rotor core and the radially outer periphery of the magnet housing hole;
A coupling portion located on the inter-electrode side of the magnet accommodation hole and the rib,
The rib is
A connecting portion side rib located on the connecting portion side;
A rotor core side rib located on the rotor core side;
A central rib located between the connecting portion side rib and the rotor core side rib;
Consisting of
The width of the connecting part side rib is a permanent magnet synchronous machine wider than the width of the central rib.
半径Ｒ１と半径Ｒ２の合計値が前記永久磁石の磁化方向厚みよりも小さいことを特徴とする請求項１乃至３のいずれかに記載の永久磁石同期機。 At the end portion between the poles of the magnet accommodation hole, the shape on the pole center side is an arc having a radius R1, and the shape on the pole side is an arc having a radius R2.
4. The permanent magnet synchronous machine according to claim 1, wherein a total value of the radius R <b> 1 and the radius R <b> 2 is smaller than a thickness in the magnetization direction of the permanent magnet.
前記中央部の磁化方向のクリアランスが前記側部の磁化方向のクリアランスよりも大きいことを特徴とする請求項１乃至５のいずれかに記載の永久磁石同期機。 The permanent magnet has a central part and side parts located at both ends of the central part,
The permanent magnet synchronous machine according to any one of claims 1 to 5, wherein a clearance in the magnetization direction of the central portion is larger than a clearance in the magnetization direction of the side portion.
前記側部の磁化方向と垂直方向の長さが前記中央部の直線長さよりも長いことを特徴とする請求項１乃至５のいずれかに記載の永久磁石同期機。 The permanent magnet has a central part and side parts located at both ends of the central part,
The permanent magnet synchronous machine according to any one of claims 1 to 5, wherein a length of the side portion in a direction perpendicular to the magnetization direction is longer than a linear length of the central portion.
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