JP6104335B2 - Electric equipment equipped with an electric motor - Google Patents

Electric equipment equipped with an electric motor Download PDF

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JP6104335B2
JP6104335B2 JP2015174602A JP2015174602A JP6104335B2 JP 6104335 B2 JP6104335 B2 JP 6104335B2 JP 2015174602 A JP2015174602 A JP 2015174602A JP 2015174602 A JP2015174602 A JP 2015174602A JP 6104335 B2 JP6104335 B2 JP 6104335B2
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pair
permanent magnet
rotor
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JP2015216845A (en
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浩二 矢部
浩二 矢部
直弘 桶谷
直弘 桶谷
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Mitsubishi Electric Corp
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Description

本発明は、電動機を搭載した電気機器に関する。   The present invention relates to an electric device equipped with an electric motor.

永久磁石埋込型の電動機の回転子は、永久磁石が回転子内部に埋込まれた形状であり、永久磁石端部に空隙を設けることで永久磁石からの漏れ磁束を抑制している。この構成では、回転子外周と空隙との間に存在する薄肉部の径方向幅が小さいほど漏れ磁束が低減されることから、薄肉部の径方向幅をできる限り小さくするよう設計することが多い。   The rotor of the permanent magnet embedded type electric motor has a shape in which the permanent magnet is embedded in the rotor, and suppresses leakage magnetic flux from the permanent magnet by providing a gap at the end of the permanent magnet. In this configuration, since the leakage magnetic flux is reduced as the radial width of the thin portion existing between the outer periphery of the rotor and the gap is smaller, it is often designed to make the radial width of the thin portion as small as possible. .

また、永久磁石は回転子表面に存在すると永久磁石内部に発生する渦電流が大きくなり、損失が増加することから、回転子内周側に埋込む場合がある。この場合は、薄肉部の径方向幅を小さくするために、空隙は永久磁石端部から回転子外周方向に向かって延びる形状となる。   In addition, if the permanent magnet is present on the rotor surface, an eddy current generated inside the permanent magnet is increased and loss is increased. Therefore, the permanent magnet may be embedded on the inner peripheral side of the rotor. In this case, in order to reduce the radial width of the thin wall portion, the air gap has a shape extending from the end of the permanent magnet toward the outer periphery of the rotor.

また、特許文献１では、永久磁石埋込型電動機の回転子において、永久磁石端部の空隙を回転子内周方向に屈曲させることで、回転時の遠心力による応力集中を低減している。   Moreover, in patent document 1, in the rotor of a permanent magnet embedded type electric motor, the stress concentration by the centrifugal force at the time of rotation is reduced by bending the space | gap of a permanent magnet edge part to a rotor inner peripheral direction.

特開２０１０−０８８２１９号公報JP 2010-088219 A

しかしながら、上記永久磁石埋込型の電動機の回転子において、薄肉部の径方向幅を小さくした場合、電動機の運転中の電磁加振力および遠心力に対する強度が弱くなるなど、その強度が弱くなるという課題がある。   However, in the rotor of the embedded permanent magnet type motor, when the radial width of the thin portion is reduced, the strength against electromagnetic excitation force and centrifugal force during operation of the motor is weakened. There is a problem.

また、永久磁石を回転子内周側に埋込む構成とした場合、永久磁石よりも外周側に存在する回転子コアの量が大きくなることから、遠心力が大きくなり、薄肉部に掛かる応力が大きくなり、強度が弱くなってしまうという課題がある。   In addition, when the permanent magnet is embedded in the inner circumferential side of the rotor, the amount of the rotor core existing on the outer circumferential side of the permanent magnet is increased, so that the centrifugal force is increased and the stress applied to the thin portion is increased. There is a problem that it becomes large and the strength becomes weak.

また、特許文献１に記載の永久磁石埋込型電動機の回転子では、回転時の遠心力による応力集中は低減されるが、永久磁石の両端部の空隙が回転子中心に向かって屈曲させているため、空隙と回転子外周との間にある薄肉部の径方向幅が大きくなり、漏れ磁束が大きくなるという課題がある。   In the rotor of the permanent magnet embedded motor described in Patent Document 1, stress concentration due to centrifugal force during rotation is reduced, but the gaps at both ends of the permanent magnet are bent toward the rotor center. Therefore, there is a problem that the radial width of the thin portion between the gap and the outer periphery of the rotor is increased, and the leakage magnetic flux is increased.

この発明は、上記に鑑みてなされたものであって、永久磁石端部の空隙と回転子外周との間の薄肉部に発生する応力を緩和し、薄肉部の強度を向上させることが可能な永久磁石埋込型の電動機を搭載した電気機器を提供することを目的とする。   The present invention has been made in view of the above, and can relieve the stress generated in the thin portion between the gap at the end of the permanent magnet and the outer periphery of the rotor and improve the strength of the thin portion. It is an object of the present invention to provide an electric device equipped with a permanent magnet embedded motor.

上述した課題を解決し、目的を達成するために、本発明に係る電動機を搭載した電気機器は、周方向に沿って等間隔で配列された複数個の永久磁石挿入穴を有する回転子鉄心と、前記複数個の永久磁石挿入穴内にそれぞれ配置された複数個の永久磁石と、を備え、前記複数個の永久磁石の各々の前記周方向の両側には、当該永久磁石が前記永久磁石挿入穴内に配置された状態で、当該永久磁石挿入穴の一部として前記回転子鉄心の外周側に向かって延びる１対の空隙が設けられ、前記１対の空隙と前記回転子鉄心の外周との間には１対の薄肉部が設けられ、前記１対の空隙の各々には、前記外周側の二か所に丸みを帯びた一対の角部が設けられ、前記１対の空隙の各々では、前記一対の角部は異なる曲率半径であり、前記１対の空隙の各々では、前記一対の角部のいずれか一方の曲率半径が当該空隙の周方向幅の半分以上であり、前記一対の角部のいずれか一方での前記薄肉部の径方向幅は、前記一対の角部のいずれか他方での前記薄肉部の径方向幅よりも大きい。   In order to solve the above-described problems and achieve the object, an electric device equipped with the electric motor according to the present invention includes a rotor core having a plurality of permanent magnet insertion holes arranged at equal intervals along the circumferential direction. A plurality of permanent magnets respectively disposed in the plurality of permanent magnet insertion holes, and the permanent magnets are disposed in the permanent magnet insertion holes on both sides in the circumferential direction of the plurality of permanent magnets. A pair of gaps extending toward the outer peripheral side of the rotor core as a part of the permanent magnet insertion hole, and between the pair of gaps and the outer circumference of the rotor core. Is provided with a pair of thin-walled portions, and each of the pair of gaps is provided with a pair of rounded corners at two locations on the outer peripheral side, and in each of the pair of gaps, The pair of corners have different radii of curvature, and each of the pair of gaps The radius of curvature of one of the pair of corners is half or more of the circumferential width of the gap, and the radial width of the thin portion of either of the pair of corners is the pair of corners. It is larger than the radial width of the thin portion at the other of the portions.

本発明によれば、永久磁石端部の空隙と回転子外周との間の薄肉部に発生する応力を緩和し、薄肉部の強度を向上させることができる、という効果を奏する。   According to the present invention, there is an effect that the stress generated in the thin portion between the gap at the end of the permanent magnet and the outer periphery of the rotor can be relieved and the strength of the thin portion can be improved.

図１は、実施の形態に係る永久磁石埋込型の電動機の回転子の横断面図である。FIG. 1 is a cross-sectional view of a rotor of an embedded permanent magnet motor according to an embodiment. 図２は、図１の磁極部の拡大図である。FIG. 2 is an enlarged view of the magnetic pole portion of FIG. 図３は、磁極部と固定子ティースの一部を示した拡大図である。FIG. 3 is an enlarged view showing a part of the magnetic pole part and the stator teeth. 図４は、実施の形態の変形例に係る永久磁石埋込型の電動機の回転子の横断面図である。FIG. 4 is a cross-sectional view of a rotor of an embedded permanent magnet electric motor according to a modification of the embodiment.

以下に、本発明の実施の形態に係る電動機を搭載した電気機器を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Below, the electric equipment carrying the electric motor which concerns on embodiment of this invention is demonstrated in detail based on drawing. Note that the present invention is not limited to the embodiments.

実施の形態．
図１は、本実施の形態に係る永久磁石埋込型の電動機の回転子１の横断面図、図２は、図１の磁極部の拡大図である。以下、図１および図２を参照して、回転子１の構成について説明する。 Embodiment.
FIG. 1 is a cross-sectional view of a rotor 1 of an embedded permanent magnet electric motor according to the present embodiment, and FIG. 2 is an enlarged view of a magnetic pole portion of FIG. Hereinafter, the configuration of the rotor 1 will be described with reference to FIGS. 1 and 2.

回転子１は、回転子鉄心２と、回転子鉄心２に埋め込まれた永久磁石４とを備えている。回転子１は、図示しない固定子の内側に回転自在に配置されている。   The rotor 1 includes a rotor core 2 and a permanent magnet 4 embedded in the rotor core 2. The rotor 1 is rotatably arranged inside a stator (not shown).

回転子鉄心２は、横断面形状が略円形である。回転子鉄心２は、例えば薄板の電磁鋼板を金型で打ち抜き、この電磁鋼板を複数枚積層して形成することができる。   The rotor core 2 has a substantially circular cross section. The rotor core 2 can be formed by, for example, punching a thin electromagnetic steel sheet with a mold and laminating a plurality of the electromagnetic steel sheets.

回転子鉄心２の外周部には、周方向に沿って例えば略等間隔で複数個（例えば６個）の永久磁石挿入穴３が形成されている。永久磁石挿入穴３には、永久磁石４が挿入される。永久磁石４は例えば平板状であり、永久磁石挿入穴３の横断面形状も永久磁石４の形状に応じた形となっている。永久磁石４はＮ極とＳ極とが周方向に交互になるように配置されており、これにより６極の回転子１を構成している。   A plurality of (for example, six) permanent magnet insertion holes 3 are formed in the outer peripheral portion of the rotor core 2 along the circumferential direction, for example, at substantially equal intervals. The permanent magnet 4 is inserted into the permanent magnet insertion hole 3. The permanent magnet 4 has a flat plate shape, for example, and the shape of the cross section of the permanent magnet insertion hole 3 is also in accordance with the shape of the permanent magnet 4. The permanent magnets 4 are arranged so that the N poles and the S poles are alternately arranged in the circumferential direction, thereby constituting a 6-pole rotor 1.

永久磁石挿入穴３よりも外周側の回転子鉄心２には、複数個のスリット６が周方向に所定の間隔で形成されている。スリット６は、磁極ごとに、磁極中心８に対して例えば左右対称に３個ずつ形成されている。なお、磁極中心８は、永久磁石４の磁極の周方向の中心、または、永久磁石挿入穴３の周方向の中心を表す。極間９は、隣り合う永久磁石４の磁極間、または、隣り合う永久磁石挿入穴３間を表す。   A plurality of slits 6 are formed at predetermined intervals in the circumferential direction in the rotor core 2 on the outer peripheral side of the permanent magnet insertion hole 3. For example, three slits 6 are formed symmetrically with respect to the magnetic pole center 8 for each magnetic pole. The magnetic pole center 8 represents the center in the circumferential direction of the magnetic pole of the permanent magnet 4 or the center in the circumferential direction of the permanent magnet insertion hole 3. The inter-pole 9 represents between the magnetic poles of the adjacent permanent magnets 4 or between the adjacent permanent magnet insertion holes 3.

永久磁石挿入穴３の両端部には、永久磁石４が永久磁石挿入穴３に挿入された状態で、空隙５がそれぞれ形成されている。すなわち、空隙５は、永久磁石挿入穴３の一部であり、永久磁石端部空隙を構成する。空隙５は、永久磁石４の端部から回転子外周方向に向かって延びており、周方向幅は略一定（幅ｔ２）である。ここで、回転子外周方向は、回転子鉄心２の外周方向（外径方向）である。このように、空隙５は、永久磁石挿入穴３のうち永久磁石４が挿入される部分に対して、回転子鉄心２の外周側（外径側）に向かって折れ曲がり、回転子鉄心２の径方向に沿って外側に向かって延びている。空隙５は、永久磁石４からの漏れ磁束を抑制する。回転子鉄心２の外周と空隙５との間には、薄肉部７が形成される。   At both ends of the permanent magnet insertion hole 3, gaps 5 are formed in a state where the permanent magnet 4 is inserted into the permanent magnet insertion hole 3. That is, the gap 5 is a part of the permanent magnet insertion hole 3 and constitutes a permanent magnet end part gap. The gap 5 extends from the end of the permanent magnet 4 toward the outer periphery of the rotor, and the circumferential width is substantially constant (width t2). Here, the outer circumferential direction of the rotor is the outer circumferential direction (outer diameter direction) of the rotor core 2. Thus, the gap 5 is bent toward the outer peripheral side (outer diameter side) of the rotor core 2 with respect to the portion of the permanent magnet insertion hole 3 where the permanent magnet 4 is inserted, and the diameter of the rotor core 2 is increased. It extends outward along the direction. The air gap 5 suppresses leakage magnetic flux from the permanent magnet 4. A thin portion 7 is formed between the outer periphery of the rotor core 2 and the gap 5.

空隙５は、上記のように回転子外周方向に向かって延びており、外周側の二か所に丸みを帯びた角部Ｐ１，Ｐ２を有する。角部Ｐ１は曲率半径Ｒ１の丸取りされた形状であり、角部Ｐ２は曲率半径Ｒ２の丸取りされた形状である。角部Ｐ１，Ｐ２は、薄肉部７の角部でもある。本実施の形態では、角部Ｐ１，Ｐ２に対して、Ｒ１≧ｔ２／２またはＲ２≧ｔ２／２とする。ここで、ｔ２は空隙５の周方向幅である。図示例では、例えば、Ｒ１＞ｔ２／２としている。これにより、角部Ｐ１では、薄肉部７の径方向幅が他の箇所よりも大きくなっている。   The gap 5 extends toward the outer periphery of the rotor as described above, and has rounded corners P1 and P2 at two locations on the outer periphery side. The corner portion P1 has a rounded shape with a radius of curvature R1, and the corner portion P2 has a rounded shape with a radius of curvature R2. The corner portions P1 and P2 are also corner portions of the thin portion 7. In the present embodiment, R1 ≧ t2 / 2 or R2 ≧ t2 / 2 with respect to the corner portions P1 and P2. Here, t2 is the circumferential width of the gap 5. In the illustrated example, for example, R1> t2 / 2. Thereby, in the corner | angular part P1, the radial direction width | variety of the thin part 7 is larger than another location.

回転子１が回転すると、遠心力が働き、回転子鉄心２の外周部に存在する薄肉部７に応力が発生する。その応力は薄肉部７の一点に集中するため、角部Ｐ１，Ｐ２のうち応力が集中する部分に近い方の曲率半径を大きくすることで薄肉部７の径方向幅が大きくなり、薄肉部７に発生する応力を緩和し、その強度を改善することができる。また、応力が薄肉部７の集中部分が薄肉部７の中心であるｔ２／２の位置まで広がる場合がある。この時は薄肉部７の中心も応力緩和する必要がある。そのため、角部Ｐ１，Ｐ２に対して、Ｒ１＞ｔ２／２またはＲ２＞ｔ２／２とすることで角部Ｐ１と角部Ｐ２との間における空隙５の中心側の形状も円弧で形成でき、中心側まで広がる薄肉部７に発生する応力を緩和することができる。   When the rotor 1 rotates, centrifugal force works, and stress is generated in the thin portion 7 existing on the outer peripheral portion of the rotor core 2. Since the stress is concentrated at one point of the thin portion 7, the radial width of the thin portion 7 is increased by increasing the radius of curvature of the corner portions P1, P2 closer to the portion where the stress is concentrated. It is possible to relieve the stress generated in the film and improve its strength. Further, the concentrated portion of the thin portion 7 may spread to a position t2 / 2 that is the center of the thin portion 7 in some cases. At this time, it is necessary to relieve stress at the center of the thin portion 7 as well. Therefore, by setting R1> t2 / 2 or R2> t2 / 2 with respect to the corner portions P1 and P2, the shape of the center side of the gap 5 between the corner portion P1 and the corner portion P2 can be formed as an arc. The stress generated in the thin portion 7 extending to the center side can be relaxed.

また、本実施の形態では、極間９により近い角部Ｐ１と磁極中心８により近い角部Ｐ２とに対し、Ｒ１＞Ｒ２としている。すなわち、極間９により近い方の角部Ｐ１の曲率半径Ｒ１をより大きくしている。薄肉部７の応力が集中する箇所は、極間部に近い部分に発生することが多く、そのような回転子においては、Ｒ２＜Ｒ１とすることで応力緩和が可能となる。   In the present embodiment, R1> R2 is satisfied for the corner P1 closer to the pole 9 and the corner P2 closer to the magnetic pole center 8. That is, the radius of curvature R1 of the corner P1 closer to the gap 9 is made larger. The portion where the stress of the thin portion 7 is concentrated often occurs in a portion close to the interpolar portion, and in such a rotor, the stress can be relaxed by setting R2 <R1.

また、角部Ｐ１と角部Ｐ２との間における空隙５の形状は、例えば曲線とすることができる。角部Ｐ１と角部Ｐ２との間における当該曲線上の任意の点をＰ３とし、点Ｐ３における曲線の曲率半径をＲ３としたときに、例えば、Ｒ２＜Ｒ３かつＲ１＜Ｒ３とすることができる。Ｒ１，Ｒ２に対してＲ３を最も大きくすることで、薄肉部７の径方向幅の変化が小さくなる。その結果、永久磁石４から薄肉部７を通って漏れる漏れ磁束が小さくなり、磁束を有効に使用することができる。   Moreover, the shape of the space | gap 5 between the corner | angular part P1 and the corner | angular part P2 can be made into a curve, for example. When an arbitrary point on the curve between the corner portion P1 and the corner portion P2 is P3 and the curvature radius of the curve at the point P3 is R3, for example, R2 <R3 and R1 <R3 can be satisfied. . By making R3 the largest with respect to R1 and R2, the change in the radial width of the thin portion 7 is reduced. As a result, the leakage magnetic flux leaking from the permanent magnet 4 through the thin portion 7 is reduced, and the magnetic flux can be used effectively.

なお、角部Ｐ１と角部Ｐ２との間における空隙５の形状を直線とすることもできる。この場合は、曲線の場合と比べて、回転子鉄心２の製造に用いる金型の摩耗が小さくなり、金型の寿命を延ばすことができる。   Note that the shape of the gap 5 between the corner portion P1 and the corner portion P2 may be a straight line. In this case, compared to the case of the curve, the wear of the mold used for manufacturing the rotor core 2 is reduced, and the life of the mold can be extended.

また、角部Ｐ１と角部Ｐ２との間における空隙５の形状を曲線とした場合において、薄肉部７の径方向幅が周方向に略一定となる領域を設けるようにすることもできる。薄肉部７の径方向の寸法が略一定である領域を設けることで、漏れ磁束を低減することができ、磁束を有効に利用することができる。   In addition, when the shape of the gap 5 between the corner portion P1 and the corner portion P2 is a curve, a region where the radial width of the thin portion 7 is substantially constant in the circumferential direction can be provided. By providing the region where the radial dimension of the thin portion 7 is substantially constant, the leakage magnetic flux can be reduced and the magnetic flux can be used effectively.

また、回転子鉄心２の（最大）半径Ｒに対して、永久磁石４の埋込深さＬ１が０．１×Ｒ≦Ｌ１の関係を満たすものとすることができる。ここで、永久磁石４の埋込深さＬ１は、磁極中心８において、回転子鉄心２の外周面から永久磁石４に至る距離である。永久磁石４の埋込深さＬ１が大きいと、永久磁石４の外周側鉄心が大きくなり、薄肉部７にかかる応力が大きくなるため、本実施の形態をより効果的に適用することができる。   Further, the embedded depth L1 of the permanent magnet 4 can satisfy the relationship of 0.1 × R ≦ L1 with respect to the (maximum) radius R of the rotor core 2. Here, the embedded depth L1 of the permanent magnet 4 is the distance from the outer peripheral surface of the rotor core 2 to the permanent magnet 4 at the magnetic pole center 8. If the embedding depth L1 of the permanent magnet 4 is large, the outer peripheral side iron core of the permanent magnet 4 becomes large, and the stress applied to the thin portion 7 becomes large, so that this embodiment can be applied more effectively.

また、永久磁石４の厚さｔ１に対して、空隙５の周方向幅ｔ２がｔ１＞ｔ２の関係を満たすものとすることができる。ｔ２が大きいと薄肉部７が大きくなり、応力が集中するため、ｔ２の寸法を永久磁石４の厚さｔ１よりも小さくすることが望ましい。   Further, the circumferential width t2 of the air gap 5 can satisfy the relationship of t1> t2 with respect to the thickness t1 of the permanent magnet 4. If t2 is large, the thin-walled portion 7 becomes large and stress concentrates. Therefore, it is desirable to make the dimension of t2 smaller than the thickness t1 of the permanent magnet 4.

また、固定子ティースの先端と回転子１との間に存在する空隙の径方向寸法をＧとしたとき、１．５×Ｇ≦ｔ２とすることができる。ｔ２が小さいと、磁束漏れが発生するため、ｔ２を空隙の例えば１．５倍以上の大きくすることで磁束漏れを抑制することができる。なお、図３は、磁極部と固定子ティースの一部を示した拡大図である。図３では、図２で示した構成に加えて、固定子ティース１０の一部と空隙の径方向寸法Ｇを示している。   Further, when the radial dimension of the gap existing between the tip of the stator tooth and the rotor 1 is G, 1.5 × G ≦ t2. When t2 is small, magnetic flux leakage occurs. Therefore, magnetic flux leakage can be suppressed by increasing t2 to, for example, 1.5 times or more of the gap. FIG. 3 is an enlarged view showing a part of the magnetic pole part and the stator teeth. 3, in addition to the configuration shown in FIG. 2, a part of the stator tooth 10 and the radial dimension G of the gap are shown.

図４は、本実施の形態の変形例に係る永久磁石埋込型の電動機の回転子１の横断面図である。なお、図４では、図２と同一の構成要素には同一の符号を付している。図４に示すように、本変形例では、空隙５が回転子外周に向かって広がっている形状である。すなわち、空隙５は、磁極中心８側および極間９側の各形状が略直線状であり、かつ、周方向幅が回転子外周に向かって増大している。また、空隙５は、角部Ｐ１と角部Ｐ２との間の形状が略直線状である。このような形状においては、空隙５の極間９側の直線および磁極中心８側の直線の各延長線と、角部Ｐ１と角部Ｐ２との間に存在する直線の延長線との交点間の周方向幅をｔ２とする。なお、角部Ｐ１と角部Ｐ２との間の形状が略円弧状である場合は、空隙５の極間９側の直線および磁極中心８側の直線の各延長線と、角部Ｐ１と角部Ｐ２との間に存在する円弧の延長線との交点間の周方向幅をｔ２とする。また、空隙５の極間９側または磁極中心８側の形状がすべて円弧などで形成される場合には、空隙５の周方向の最大幅をｔ２とする。また、空隙５の回転子外周側に存在する形状は、例えば３つ以上の曲線または１つの直線を含む２つ以上の曲線で構成される。   FIG. 4 is a cross-sectional view of the rotor 1 of the permanent magnet embedded type electric motor according to a modification of the present embodiment. In FIG. 4, the same components as those in FIG. 2 are denoted by the same reference numerals. As shown in FIG. 4, in this modification, the gap 5 has a shape that widens toward the outer periphery of the rotor. In other words, the gap 5 has a substantially linear shape on the magnetic pole center 8 side and the inter-pole 9 side, and the circumferential width increases toward the outer periphery of the rotor. Moreover, the space | gap 5 is a substantially linear shape between the corner | angular part P1 and the corner | angular part P2. In such a shape, between the intersections between the straight lines on the gap 9 side of the gap 5 and the straight lines on the magnetic pole center 8 side and the straight line of extension existing between the corners P1 and P2. Let t2 be the circumferential width. In addition, when the shape between corner | angular part P1 and corner | angular part P2 is substantially circular arc shape, each extension line of the straight line of the space | interval 9 side of the space | gap 5 and the straight line of the magnetic pole center 8 side, and corner | angular part P1 and corner | angular Let t2 be the circumferential width between the intersection points with the extension line of the arc existing between the part P2. Further, when the shape of the gap 5 between the poles 9 or the magnetic pole center 8 is all formed by an arc or the like, the maximum width in the circumferential direction of the gap 5 is t2. Moreover, the shape which exists in the rotor outer peripheral side of the space | gap 5 is comprised by two or more curves including 3 or more curves or one straight line, for example.

以上のように、本実施の形態によれば、薄肉部７に発生する応力を緩和し、薄肉部７の強度を向上させることが可能な回転子１を得ることができる。   As described above, according to the present embodiment, it is possible to obtain the rotor 1 that can relieve the stress generated in the thin portion 7 and improve the strength of the thin portion 7.

また、本実施の形態によれば、回転子１を備えた電動機、およびこの電動機を搭載した電気機器（例えば、冷凍サイクル装置の圧縮機、空気調和機の送風機等）を得ることができる。   Moreover, according to this Embodiment, the electric motor provided with the rotor 1 and the electric equipment (for example, the compressor of a refrigerating cycle device, the air blower of an air conditioner, etc.) carrying this electric motor can be obtained.

なお、本実施の形態では、回転子１の形状を円形状としたが、これに限定されず、例えば楕円形状とすることもできる。また、極数は６極以外でもよい。いずれの場合も、本実施の形態と同様の効果を奏する。   In the present embodiment, the shape of the rotor 1 is circular, but is not limited to this, and may be, for example, elliptical. The number of poles may be other than six. In either case, the same effects as in the present embodiment can be obtained.

また、本実施の形態では、永久磁石４の外周側に複数個のスリット６を設けている。スリット６は、誘起電圧の高調波低減、およびトルクリップル低減に用いられる。このように、回転子鉄心２の外周部にスリット６を設けることで更に効果的である。すなわち、スリット６は空隙であることから、回転子鉄心２よりも軽く、遠心力の影響を低減することができる。   In the present embodiment, a plurality of slits 6 are provided on the outer peripheral side of the permanent magnet 4. The slit 6 is used to reduce harmonics of the induced voltage and torque ripple. As described above, it is more effective to provide the slit 6 on the outer peripheral portion of the rotor core 2. That is, since the slit 6 is a gap, it is lighter than the rotor core 2 and the influence of centrifugal force can be reduced.

本実施の形態のその他の効果は既に説明したとおりである。   Other effects of the present embodiment are as described above.

以上のように、本発明は、永久磁石埋込型の電動機の回転子として有用である。   As described above, the present invention is useful as a rotor of a permanent magnet embedded type electric motor.

１ 回転子、２ 回転子鉄心、３ 永久磁石挿入穴、４ 永久磁石、５ 空隙、６ スリット、７ 薄肉部、８ 磁極中心、９ 極間、１０ 固定子ティース。   DESCRIPTION OF SYMBOLS 1 Rotor, 2 Rotor core, 3 Permanent magnet insertion hole, 4 Permanent magnet, 5 Space | gap, 6 Slit, 7 Thin part, 8 Magnetic pole center, Between 9 poles, 10 Stator teeth.

Claims (2)

周方向に沿って等間隔で配列された複数個の永久磁石挿入穴を有する回転子鉄心と、
前記複数個の永久磁石挿入穴内にそれぞれ配置された複数個の永久磁石と、
を備え、
前記複数個の永久磁石の各々の前記周方向の両側には、当該永久磁石が前記永久磁石挿入穴内に配置された状態で、当該永久磁石挿入穴の一部として前記回転子鉄心の外周側に向かって延びる１対の空隙が設けられ、
前記１対の空隙と前記回転子鉄心の外周との間には１対の薄肉部が設けられ、
前記１対の空隙の各々には、前記外周側の二か所に丸みを帯びた一対の角部が設けられ、
前記１対の空隙の各々では、前記一対の角部のうち極間により近い方の曲率半径が、前記一対の角部のうち磁極中心により近い方の曲率半径よりも大きく、
前記１対の空隙の各々では、前記一対の角部のいずれか一方の曲率半径が当該空隙の周方向幅の半分以上であり、
前記一対の角部のいずれか一方での前記薄肉部の径方向幅は、前記一対の角部のいずれか他方での前記薄肉部の径方向幅よりも大きく、
前記１対の空隙の各々が、周方向幅が一定である領域を有する電動機を搭載した電気機器。 A rotor core having a plurality of permanent magnet insertion holes arranged at equal intervals along the circumferential direction;
A plurality of permanent magnets respectively disposed in the plurality of permanent magnet insertion holes;
With
On both sides of each of the plurality of permanent magnets in the circumferential direction, the permanent magnets are disposed in the permanent magnet insertion holes and are disposed on the outer peripheral side of the rotor core as part of the permanent magnet insertion holes. A pair of gaps extending toward the
A pair of thin portions are provided between the pair of gaps and the outer periphery of the rotor core,
Each of the pair of gaps is provided with a pair of rounded corners at two locations on the outer peripheral side,
In each of the pair of gaps, the radius of curvature closer to the poles of the pair of corners is larger than the radius of curvature closer to the magnetic pole center of the pair of corners ,
In each of the pair of gaps, the radius of curvature of any one of the pair of corners is more than half of the circumferential width of the gap,
The radial width of the thin portion at one of the pair of corner portions is much larger than the radial width of the thin portion at the other of the pair of corner portions,
An electric device equipped with an electric motor in which each of the pair of gaps has a region having a constant circumferential width . 前記１対の空隙の各々は、前記回転子鉄心の径方向に沿って延びている請求項１に記載の電動機を搭載した電気機器。   2. The electric device on which the electric motor according to claim 1 is mounted, wherein each of the pair of gaps extends along a radial direction of the rotor core.
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