JP2018082562A - Rotor for magnet-embedded motor and magnet-embedded motor - Google Patents

Rotor for magnet-embedded motor and magnet-embedded motor Download PDF

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JP2018082562A
JP2018082562A JP2016223338A JP2016223338A JP2018082562A JP 2018082562 A JP2018082562 A JP 2018082562A JP 2016223338 A JP2016223338 A JP 2016223338A JP 2016223338 A JP2016223338 A JP 2016223338A JP 2018082562 A JP2018082562 A JP 2018082562A
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magnet
rotor
rotor core
gap
embedded motor
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JP6886803B2 (en
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忠 薗部
Tadashi Sonobe
忠 薗部
翔太 植田
Shota Ueda
翔太 植田
公通 麻生
Kimimichi Aso
公通 麻生
尚哉 吉廣
Naoya Yoshihiro
尚哉 吉廣
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Mayekawa Manufacturing Co
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Abstract

PROBLEM TO BE SOLVED: To enhance durability against centrifugal force of a rotor, and suppress an occurrence of stress concentration to a rotor core, thereby preventing a deformation of the rotor core and a dispersion of a permanent magnet.SOLUTION: A rotor 10 for magnet-embedded motor in which a permanent magnet 16 is embedded in a rotor core 12 where a plurality of rotor core plates 12a are laminated along a rotor axis direction has a reinforcing plate 18 interposed between a plurality of rotor core plates, and a permanent magnet stored in a magnet attaching space formed in the rotor axis direction by a first magnet attaching hole 14 formed in a plurality of rotor core plates and a second magnet attaching hole 20 formed in the reinforcing plate. Both ends of the first magnet attaching hole and the second magnet attaching hole have border lines composed of continuous curve lines, a first gap s1 is formed between both ends of the permanent magnet and the border line of the first magnet attaching hole, and a second gap s2 is formed between both ends of the permanent magnet and the border line of the second magnet attaching hole.SELECTED DRAWING: Figure 2

Description

本開示は、磁石埋め込み型モータ用ロータ及び該ロータを備える磁石埋め込み型モータに関する。   The present disclosure relates to a rotor for an embedded magnet motor and an embedded magnet motor including the rotor.

近年、電動モータは取り付けられる装置の性能アップのため、小型化及び高速化が求められている。電動モータの高速化によって遠心力が増大するため、遠心力に対する耐久性が求められる。ロータコアに永久磁石を埋め込む磁石埋め込み型モータ（ＩＰＭモータ）は、ロータコアの表面に永久磁石を配置する磁石表面貼り付け型モータ（ＳＰＭモータ）と比べて、遠心力に対する耐久性が優れている。
また、磁石埋め込み型モータは、マグネットトルク（固定子と永久磁石間に発生する吸引力又は反発力）に加えて、固定子の回転磁界によって発生するリラクタンストルクを利用できるという利点がある。永久磁石の取付孔にはリラクタンストルクを増大させるために空隙を形成する場合があるが、この空隙の形成によって遠心力に対する耐久性が弱まるおそれがある。 In recent years, electric motors are required to be smaller and faster in order to improve the performance of devices to which they are attached. Since the centrifugal force increases as the speed of the electric motor increases, durability against the centrifugal force is required. A magnet-embedded motor (IPM motor) in which a permanent magnet is embedded in a rotor core is more durable against centrifugal force than a magnet surface-attached motor (SPM motor) in which a permanent magnet is disposed on the surface of a rotor core.
In addition, the magnet-embedded motor has an advantage that reluctance torque generated by the rotating magnetic field of the stator can be used in addition to magnet torque (attraction force or repulsive force generated between the stator and the permanent magnet). In some cases, a gap is formed in the mounting hole of the permanent magnet in order to increase the reluctance torque, but the formation of the gap may weaken the durability against centrifugal force.

特許文献１には、ＳＭＰモータにおいて、高速回転時の永久磁石の浮き上がりと飛散を防止するため、永久磁石を円管状の保護リングで覆う手段が開示されている。
特許文献２には、ロータコアを形成する複数の積層されたロータコア板の間に介装された中間板と、ロータコアの軸方向両端に設けられた固定板とで、永久磁石の飛散を防止する手段が開示されている。 Patent Document 1 discloses means for covering a permanent magnet with a circular protective ring in order to prevent the permanent magnet from floating and scattering during high-speed rotation in an SMP motor.
Patent Document 2 discloses a means for preventing scattering of permanent magnets by using an intermediate plate interposed between a plurality of laminated rotor core plates forming a rotor core and fixed plates provided at both axial ends of the rotor core. Has been.

特開２００５−３１２２５０号公報JP 2005-312250 A 特開２００８−０９９４７９号公報JP 2008-099479 A

特許文献１に開示された円管状の保護リングで永久磁石を覆う手段は、固定子とロータコアとの間のギャップを広げるため、ロータコアに発生するトルクを減少させる問題がある。
特許文献２に開示された磁石埋め込み型モータは、永久磁石を取り付ける取付孔の輪郭線が矩形を有するため、高速回転では不連続な輪郭を形成する部位で応力集中が起こり、変形や破損が発生するおそれがある。 The means for covering the permanent magnet with the circular tubular protective ring disclosed in Patent Document 1 has a problem of reducing the torque generated in the rotor core in order to widen the gap between the stator and the rotor core.
The magnet-embedded motor disclosed in Patent Document 2 has a rectangular outline of a mounting hole for attaching a permanent magnet, so stress concentration occurs at a portion where a discontinuous outline is formed at high speed rotation, and deformation or breakage occurs. There is a risk.

幾つかの実施形態は、磁石埋め込み型モータにおいて、ロータの遠心力に対する耐久性を向上させ、かつロータコアに応力集中が発生するのを抑制し、これによって、ロータコアの変形や永久磁石の飛散を防止することを目的とする。   Some embodiments improve durability of the rotor against centrifugal force and suppress stress concentration in the rotor core in an embedded magnet motor, thereby preventing deformation of the rotor core and scattering of permanent magnets. The purpose is to do.

（１）少なくとも一実施形態に係る磁石埋め込み型モータ用ロータは、
複数のロータコア板をロータ軸方向に沿って積層したロータコアに永久磁石を埋設した磁石埋め込み型モータ用ロータであって、
前記複数のロータコア板の間に介装される補強板と、
前記複数のロータコア板に形成された第１磁石取付孔及び前記補強板に形成された第２磁石取付孔によって前記ロータ軸方向に形成された磁石取付空間に収容された前記永久磁石と、
を備え、
前記第１磁石取付孔及び前記第２磁石取付孔の両端部は連続的な湾曲線で構成された輪郭線を有し、
前記永久磁石の両端と前記第１磁石取付孔の前記輪郭線との間に第１空隙が形成されると共に、前記永久磁石の両端と前記第２磁石取付孔の前記輪郭線との間に第２空隙が形成される。 (1) The rotor for an embedded magnet motor according to at least one embodiment,
A rotor for a magnet-embedded motor in which a permanent magnet is embedded in a rotor core obtained by laminating a plurality of rotor core plates along the rotor axial direction,
A reinforcing plate interposed between the plurality of rotor core plates;
The permanent magnet accommodated in the magnet mounting space formed in the rotor axial direction by the first magnet mounting hole formed in the plurality of rotor core plates and the second magnet mounting hole formed in the reinforcing plate;
With
Both ends of the first magnet mounting hole and the second magnet mounting hole have a contour line constituted by a continuous curved line,
A first gap is formed between both ends of the permanent magnet and the contour line of the first magnet mounting hole, and a first gap is formed between both ends of the permanent magnet and the contour line of the second magnet mounting hole. Two voids are formed.

上記（１）の構成によれば、積層された複数のロータコア板間に上記補強板を介装することで、ロータコアの遠心力に対する耐久性を向上できる。これによって、ロータコアの変形や永久磁石の飛散を防止できる。
また、第１磁石取付孔及び第２磁石取付孔の両端部の輪郭線は、連続的な湾曲線を有し、不連続線を有しないため、第１磁石取付孔及び第２磁石取付孔の周囲で、ロータコア板及び補強板は応力集中を抑制でき、これによって、ロータコアの変形や永久磁石の飛散を抑制できる。
なお、補強板は、薄く、硬い鋼板や非金属であれば繊維強化プラスチック（ＦＲＰ）のような高強度材料を含むことが望ましい。また、補強板は渦電流を流しにくい材質、例えば、電気抵抗が大きいＦＲＰ、金属ではステンレス鋼、チタン等であることが望ましい。渦電流の発生を抑制することで発熱を抑制できる。 According to the configuration of (1) above, the durability against the centrifugal force of the rotor core can be improved by interposing the reinforcing plate between the plurality of laminated rotor core plates. Thereby, deformation of the rotor core and scattering of the permanent magnet can be prevented.
Moreover, since the outline of the both ends of a 1st magnet attachment hole and a 2nd magnet attachment hole has a continuous curve line and does not have a discontinuous line, a 1st magnet attachment hole and a 2nd magnet attachment hole Around the periphery, the rotor core plate and the reinforcing plate can suppress stress concentration, thereby suppressing the deformation of the rotor core and the scattering of the permanent magnets.
The reinforcing plate preferably includes a high-strength material such as fiber reinforced plastic (FRP) if it is a thin, hard steel plate or non-metal. Further, it is desirable that the reinforcing plate is made of a material that does not allow eddy current to flow, such as FRP having a large electric resistance, and stainless steel, titanium or the like as a metal. Heat generation can be suppressed by suppressing the generation of eddy currents.

（２）一実施形態では、前記（１）の構成において、
前記第２空隙の断面積は前記第１空隙の断面積より小さく形成される。
ロータコア板の両端部に形成される第１空隙はリラクタンストルクを発生させるためであり、断面積を比較的大きく形成することで、リラクタンストルクを増加できる。他方、補強板の両端部に形成される第２空隙は、第２磁石取付孔の両端部の輪郭線を連続的な湾曲線とするために形成され、必要以上に断面積を大きくすると、補強板の強度が低下し、永久磁石の飛散防止目的を達成できない。そのため、第２空隙の断面積は第１空隙の断面積より小さく形成される。
こうして、第１空隙及び第２空隙は夫々の目的にかなった独自設計が可能になる。 (2) In one embodiment, in the configuration of (1),
The cross-sectional area of the second gap is smaller than the cross-sectional area of the first gap.
The first gap formed at both ends of the rotor core plate is for generating reluctance torque, and the reluctance torque can be increased by forming the cross-sectional area relatively large. On the other hand, the 2nd space | gap formed in the both ends of a reinforcement board is formed in order to make the outline of the both ends of a 2nd magnet attachment hole into a continuous curve line, and if cross-sectional area is enlarged more than necessary, it will reinforce. The strength of the plate is lowered, and the purpose of preventing the permanent magnets from scattering cannot be achieved. Therefore, the cross-sectional area of the second gap is formed smaller than the cross-sectional area of the first gap.
In this way, the first gap and the second gap can be uniquely designed for each purpose.

（３）一実施形態では、前記（１）又は（２）の構成において、
複数の前記磁石取付空間が前記ロータコアの外周部で前記ロータコアの周方向に形成され、複数の前記永久磁石が前記複数の磁石取付空間の各々に取り付けられる
上記（３）の構成によれば、ロータコアの外周部にロータコアの周方向に複数の永久磁石が配置されるので、マグネットトルク及びリラクタンストルクを共に増大できる。また、永久磁石を複数に分割することで、渦電流の発生を抑制でき、渦電流による発熱を抑制できる。 (3) In one embodiment, in the configuration of (1) or (2),
The plurality of magnet mounting spaces are formed in the circumferential direction of the rotor core at the outer peripheral portion of the rotor core, and the plurality of permanent magnets are mounted in each of the plurality of magnet mounting spaces. Since a plurality of permanent magnets are disposed in the circumferential direction of the rotor core on the outer peripheral portion of the rotor, both the magnet torque and the reluctance torque can be increased. Further, by dividing the permanent magnet into a plurality of parts, generation of eddy current can be suppressed and heat generation due to eddy current can be suppressed.

（４）一実施形態では、前記（１）〜（３）の何れかの構成において、
前記磁石取付空間において、複数の前記永久磁石が前記ロータ軸方向に沿って分割し直列に配置される。
上記（４）の構成によれば、複数の永久磁石をロータ軸方向に沿って分割し直列に配置するので、渦電流の発生を抑制でき、渦電流による発熱を抑制できる。 (4) In one embodiment, in any one of the configurations (1) to (3),
In the magnet mounting space, the plurality of permanent magnets are divided along the rotor axial direction and arranged in series.
According to the configuration of (4) above, since the plurality of permanent magnets are divided along the rotor axial direction and arranged in series, the generation of eddy currents can be suppressed and heat generation due to eddy currents can be suppressed.

（５）一実施形態では、前記（１）〜（４）の何れかの構成において、
複数の前記補強板が前記ロータ軸方向の異なる位置において複数のロータコア板の間に介装される。
上記（５）の構成によれば、複数の補強板をロータ軸方向に分散配置することで、遠心力に対する耐久性をロータコア全体に均一に付与できると共に、補強板の数を調整することで、ロータコアに必要にして十分な耐久性を付与できる。 (5) In one embodiment, in any one of the configurations (1) to (4),
The plurality of reinforcing plates are interposed between the plurality of rotor core plates at different positions in the rotor axial direction.
According to the configuration of (5) above, by distributing a plurality of reinforcing plates in the rotor axial direction, durability against centrifugal force can be uniformly imparted to the entire rotor core, and by adjusting the number of reinforcing plates, Sufficient durability can be imparted to the rotor core as required.

（６）一実施形態では、前記（５）の構成において、
１個の前記永久磁石ごとに、前記ロータ軸方向に２枚以上の前記補強板が配置される。
上記（６）の構成によれば、各ロータコア板に付加される遠心力をロータコア板の降伏点未満に抑えることができる。 (6) In one embodiment, in the configuration of (5),
For each of the permanent magnets, two or more reinforcing plates are arranged in the rotor axial direction.
According to the configuration of (6) above, the centrifugal force applied to each rotor core plate can be suppressed below the yield point of the rotor core plate.

（７）一実施形態では、前記（１）〜（６）の何れかの構成において、
前記第１空隙が半楕円形を有する。
上記（７）の構成によれば、第１空隙を半楕円形とすることで、第１空隙を形成するロータコア板で応力集中が発生するのを回避でき、かつロータコア板に発生するリラクタンストルクを増加できる。 (7) In one embodiment, in any one of the configurations (1) to (6),
The first gap has a semi-elliptical shape.
According to the configuration of (7) above, by making the first gap a semi-elliptical shape, it is possible to avoid stress concentration in the rotor core plate forming the first gap, and to reduce the reluctance torque generated in the rotor core plate. Can be increased.

（８）一実施形態では、前記（１）〜（７）の何れかの構成において、
前記第２空隙の断面が半円形又は半楕円形を有する。
上記（８）の構成によれば、第２空隙の断面を半円形又は半楕円形とすることで、第１空隙を形成する補強板で応力集中が発生するのを回避でき、かつロータコア板に加わる遠心力を降伏点未満に抑えることができる。 (8) In one embodiment, in any one of the configurations (1) to (7),
The cross section of the second gap has a semicircular shape or a semielliptical shape.
According to the configuration of (8) above, by making the cross section of the second gap semi-circular or semi-elliptical, it is possible to avoid stress concentration in the reinforcing plate that forms the first gap, and to the rotor core plate. The applied centrifugal force can be suppressed below the yield point.

（９）幾つかの実施形態に係る磁石埋め込み型モータは、
（１）〜（８）の何れかの構成を有する前記磁石埋め込み型モータ用ロータを備える。
上記（９）の構成によれば、積層された複数のロータコア板間に上記補強板を介装するため、ロータコアの遠心力に対する耐久性を向上でき、これによって、ロータコアの変形や永久磁石の飛散を防止できる。
また、第１磁石取付孔及び第２磁石取付孔の両端部の輪郭線は、連続的な湾曲線を有し、不連続線を有しないため、ロータコア板及び補強板に応力集中が発生するのを抑制できる。 (9) A magnet-embedded motor according to some embodiments includes:
The magnet-embedded motor rotor having any one of the constitutions (1) to (8) is provided.
According to the configuration of (9), since the reinforcing plate is interposed between the plurality of laminated rotor core plates, the durability against the centrifugal force of the rotor core can be improved, whereby the deformation of the rotor core and the scattering of the permanent magnets can be achieved. Can be prevented.
In addition, the contour lines at both ends of the first magnet mounting hole and the second magnet mounting hole have continuous curved lines and no discontinuous lines, so stress concentration occurs in the rotor core plate and the reinforcing plate. Can be suppressed.

（１０）一実施形態では、前記（９）の構成において、
前記磁石埋め込み型モータ用ロータの回転数が１０，０００ｒｐｍ以上である。
上記（１０）の構成によれば、上記（９）の構成を有する磁石埋め込み型モータのロータ回転数が１０，０００ｒｐｍ以上の高速回転となっても、ロータに発生する遠心力に対する耐久性を向上させ、かつロータコア及び補強板に応力集中が発生するのを抑制し、これによって、ロータコアの破損や永久磁石の飛散を防止できる。 (10) In one embodiment, in the configuration of (9),
The rotational speed of the magnet-embedded motor rotor is 10,000 rpm or more.
According to the configuration of (10), the durability against centrifugal force generated in the rotor is improved even when the rotor rotation speed of the embedded magnet motor having the configuration of (9) is high speed rotation of 10,000 rpm or more. In addition, it is possible to suppress the occurrence of stress concentration in the rotor core and the reinforcing plate, thereby preventing damage to the rotor core and scattering of the permanent magnets.

幾つかの実施形態によれば、磁石埋め込み型モータにおいて、高速回転時に発生する遠心力に対する耐久性を向上させ、かつロータコア及び補強板に応力集中が発生するのを抑制することで、ロータコアの破損や永久磁石の飛散を防止できる。   According to some embodiments, in a magnet-embedded motor, damage to the rotor core is improved by improving durability against centrifugal force generated during high-speed rotation and suppressing stress concentration from occurring in the rotor core and the reinforcing plate. And scattering of permanent magnets can be prevented.

一実施形態に係る磁石埋め込み型モータの断面図である。It is sectional drawing of the magnet embedded type motor which concerns on one Embodiment. 一実施形態に係る磁石埋め込み型モータの一部を示す斜視図である。It is a perspective view which shows a part of magnet embedded motor which concerns on one Embodiment. 一実施形態に係る補強板を示す斜視図である。It is a perspective view which shows the reinforcement board which concerns on one Embodiment. 主応力の測定に供した補強板の枚数及び形状を示す図表である。It is a chart which shows the number of sheets and shape of a reinforcing board which were used for measurement of principal stress. 一実施形態に係るロータコア板に加わる主応力を示す線図である。It is a diagram which shows the main stress added to the rotor core board which concerns on one Embodiment. 一実施形態に係るロータコア板に加わる主応力を示す線図である。It is a diagram which shows the main stress added to the rotor core board which concerns on one Embodiment. 一実施形態に係る永久磁石に加わる主応力を示す線図である。It is a diagram which shows the main stress added to the permanent magnet which concerns on one Embodiment. 比較例としての磁石埋め込み型モータの断面図である。It is sectional drawing of the magnet embedded type motor as a comparative example. 比較例としての補強板を示す斜視図である。It is a perspective view which shows the reinforcement board as a comparative example.

以下、添付図面を参照して本発明の幾つかの実施形態について説明する。ただし、実施形態として記載され又は図面に示されている構成部品の寸法、材質、形状、その相対的配置等は、本発明の範囲をこれに限定する趣旨ではなく、単なる説明例にすぎない。
例えば、「ある方向に」、「ある方向に沿って」、「平行」、「直交」、「中心」、「同心」或いは「同軸」等の相対的或いは絶対的な配置を表す表現は、厳密にそのような配置を表すのみならず、公差、若しくは、同じ機能が得られる程度の角度や距離をもって相対的に変位している状態も表すものとする。
例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。
例えば、四角形状や円筒形状等の形状を表す表現は、幾何学的に厳密な意味での四角形状や円筒形状等の形状を表すのみならず、同じ効果が得られる範囲で、凹凸部や面取り部等を含む形状も表すものとする。
一方、一つの構成要素を「備える」、「具える」、「具備する」、「含む」、又は「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。 Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of other constituent elements.

少なくとも一実施形態に係る磁石埋め込み型モータ用ロータ（以下「ＩＰＭロータ」とも言う。）１０は、図１及び図２に示すように、複数のロータコア板１２ａをロータ軸方向に沿って積層したロータコア１２に永久磁石１６を埋設した構成を有する。積層された複数のロータコア板１２ａの間に介装される非磁性の補強板１８が介装される。
各ロータコア板１２ａには第１磁石取付孔１４が形成され、補強板１８には第２磁石取付孔２０が形成される。第１磁石取付孔１４及び第２磁石取付孔２０はこれらの輪郭線がロータ軸方向（図２の矢印ａ方向）に重なるように、ロータ軸方向（図１中の矢印ａ方向）と直交する面上で同じ位置に形成され、ロータ軸方向に磁石取付空間が形成される。 As shown in FIG. 1 and FIG. 2, a rotor for a magnet-embedded motor (hereinafter also referred to as “IPM rotor”) 10 according to at least one embodiment is a rotor core in which a plurality of rotor core plates 12 a are stacked along the rotor axial direction. 12 has a configuration in which a permanent magnet 16 is embedded. A nonmagnetic reinforcing plate 18 is interposed between the plurality of laminated rotor core plates 12a.
Each rotor core plate 12 a is formed with a first magnet mounting hole 14, and the reinforcing plate 18 is formed with a second magnet mounting hole 20. The first magnet mounting hole 14 and the second magnet mounting hole 20 are orthogonal to the rotor axial direction (arrow a direction in FIG. 1) so that these contour lines overlap with the rotor axial direction (arrow a direction in FIG. 2). Formed at the same position on the surface, a magnet mounting space is formed in the rotor axial direction.

第１磁石取付孔１４及び第２磁石取付孔２０の両端部は連続的な湾曲線で構成された輪郭線を有し、永久磁石１６の両端と第１磁石取付孔１４の輪郭線との間に第１空隙ｓ１が形成される。また、永久磁石１６の両端と第２磁石取付孔２０の輪郭線との間に第２空隙ｓ２が形成される。   Both ends of the first magnet mounting hole 14 and the second magnet mounting hole 20 have a contour line constituted by a continuous curved line, and between the both ends of the permanent magnet 16 and the contour line of the first magnet mounting hole 14. A first gap s1 is formed in the first. A second gap s <b> 2 is formed between both ends of the permanent magnet 16 and the contour line of the second magnet mounting hole 20.

上記構成によれば、積層された複数のロータコア板１２ａの間に補強板１８を介装することで、ロータコア１２は、ロータコア１２の回転によって発生する遠心力に対する耐久性を向上できる。これによって、ロータコア１２の変形や永久磁石１６の飛散を防止できる。また、補強板１８は、前述のように、ロータコア１２における渦電流の発生を抑制でき、渦電流による発熱を抑制できる材質であることが望ましい。
また、第１磁石取付孔１４及び第２磁石取付孔２０の両端部の輪郭線、即ち、第１空隙ｓ１及び第２空隙ｓ２を形成する輪郭線は、連続的な湾曲線を有し、不連続線を有しない。従って、第１磁石取付孔１４及び第２磁石取付孔２０の周囲で、ロータコア板１２ａ及び補強板１８は応力集中を抑制でき、ロータコア１２の変形や永久磁石１６の飛散を抑制できる。 According to the above configuration, the rotor core 12 can improve durability against the centrifugal force generated by the rotation of the rotor core 12 by interposing the reinforcing plate 18 between the plurality of laminated rotor core plates 12a. Thereby, deformation of the rotor core 12 and scattering of the permanent magnet 16 can be prevented. Further, as described above, the reinforcing plate 18 is desirably made of a material that can suppress the generation of eddy currents in the rotor core 12 and can suppress the heat generation due to the eddy currents.
Further, the contour lines at both ends of the first magnet mounting hole 14 and the second magnet mounting hole 20, that is, the contour lines forming the first air gap s1 and the second air gap s2, have a continuous curved line, Does not have a continuous line. Therefore, the rotor core plate 12a and the reinforcing plate 18 can suppress stress concentration around the first magnet mounting hole 14 and the second magnet mounting hole 20, and the deformation of the rotor core 12 and the scattering of the permanent magnet 16 can be suppressed.

一実施形態では、ロータコア板１２ａは、例えば板厚が０．３５ｍｍ以下の磁性金属でで構成され、ロータコア１２はロータコア板１２ａの積層で構成される。磁性金属として、例えば、ケイ素鋼、純鉄、合金鋼、等の鉄系金属が用いられる。ロータコア１２は多数のロータコア板１２ａの積層で構成されることで、渦電流の発生による発熱を抑制できる。
一実施形態では、補強板１８は、例えば、非磁性体であるチタン、ステンレス鋼、等で構成される。 In one embodiment, the rotor core plate 12a is made of, for example, a magnetic metal having a plate thickness of 0.35 mm or less, and the rotor core 12 is made of a laminate of the rotor core plates 12a. As the magnetic metal, for example, an iron-based metal such as silicon steel, pure iron, alloy steel, or the like is used. Since the rotor core 12 is configured by stacking a large number of rotor core plates 12a, heat generation due to generation of eddy currents can be suppressed.
In one embodiment, the reinforcing plate 18 is made of, for example, titanium or stainless steel that is a non-magnetic material.

一実施形態では、多数のロータコア板１２ａ及び補強板１８の各々に取付孔２２が形成され、ロータコア板１２ａが積層されることで、ロータ軸方向に取付孔が形成される。この取付孔２２に挿入される取付具（不図示）によって一体に固定される。
一実施形態では、ロータコア１２は回転軸２４の外周側に回転軸２４と一体に固定される。
一実施形態では、磁石埋め込み型モータ１は、図１及び図２に示すように、回転軸２４と、ロータコア１２と、ロータコア１２の外周側に配置されるステータコア２６と、ステータコア２６にロータ軸方向に沿って形成された多数の溝に埋設されたコイル２８と、を備える。ステータコア２６は多数の磁性体の薄板が積層されて構成される。 In one embodiment, the attachment holes 22 are formed in each of the large number of rotor core plates 12a and the reinforcing plates 18, and the attachment holes are formed in the rotor axial direction by stacking the rotor core plates 12a. It is fixed integrally by a fixture (not shown) inserted into the mounting hole 22.
In one embodiment, the rotor core 12 is fixed integrally with the rotary shaft 24 on the outer peripheral side of the rotary shaft 24.
In one embodiment, as shown in FIGS. 1 and 2, the magnet-embedded motor 1 includes a rotating shaft 24, a rotor core 12, a stator core 26 disposed on the outer peripheral side of the rotor core 12, and the stator core 26 in the rotor axial direction. And a coil 28 embedded in a number of grooves formed along the line. The stator core 26 is configured by laminating a number of thin magnetic plates.

一実施形態では、第２空隙ｓ２の断面積は第１空隙ｓ１の断面積より小さく形成される。
ロータコア板１２ａの両端部に形成される第１空隙ｓ１はリラクタンストルクを発生させるためであり、断面積を比較的大きく形成することでリラクタンストルクを増加できる。他方、補強板１８の両端部に形成される第２空隙ｓ２は、第２磁石取付孔２０の両端部の輪郭線を連続的な湾曲線とするために形成され、必要以上に大きく形成すると、補強板１８の強度が低下し、永久磁石１６の飛散防止目的を達成できない。そのため、第２空隙ｓ２の断面積は第１空隙ｓ１の断面積より小さく形成される。
また、第２空隙ｓ２の断面積は第１空隙ｓ１の断面積より小さく形成することで、第１空隙と第２空隙とを夫々の目的にかなった独自設計が可能になる。 In one embodiment, the cross-sectional area of the second gap s2 is smaller than the cross-sectional area of the first gap s1.
The first gap s1 formed at both ends of the rotor core plate 12a is for generating reluctance torque, and the reluctance torque can be increased by forming the cross-sectional area relatively large. On the other hand, the second gap s2 formed at both ends of the reinforcing plate 18 is formed so that the contour lines at both ends of the second magnet mounting hole 20 are continuous curved lines. The strength of the reinforcing plate 18 is lowered, and the purpose of preventing the permanent magnets 16 from being scattered cannot be achieved. Therefore, the cross-sectional area of the second gap s2 is formed smaller than the cross-sectional area of the first gap s1.
Further, by forming the cross-sectional area of the second air gap s2 smaller than the cross-sectional area of the first air gap s1, it is possible to uniquely design the first air gap and the second air gap for each purpose.

一実施形態では、図１及び図２に示すように、複数の第１磁石取付孔１４及び第２磁石取付孔２０によって形成される磁石取付空間がロータコア１２の外周部でロータコア１２の周方向に形成され、複数の永久磁石１６が複数の磁石取付空間の各々に取り付けられる。
ロータコア１２とステータコア２６とに跨って形成される磁力線Ｌｍによって表される磁束によってマグネットトルクが発生し、永久磁石１６間に跨って形成される磁力線Ｌｍによって表される磁束によってリラクタンストルクが発生する。
ロータコア１２の外周部にロータコア１２の周方向に沿って複数の永久磁石１６が配置されるので、マグネットトルク及びリラクタンストルクを共に増大できる。 In one embodiment, as shown in FIGS. 1 and 2, the magnet mounting space formed by the plurality of first magnet mounting holes 14 and the second magnet mounting holes 20 is the outer peripheral portion of the rotor core 12 in the circumferential direction of the rotor core 12. The plurality of permanent magnets 16 are formed and attached to each of the plurality of magnet mounting spaces.
Magnet torque is generated by the magnetic flux expressed by the magnetic force lines Lm formed across the rotor core 12 and the stator core 26, and reluctance torque is generated by the magnetic flux expressed by the magnetic force lines Lm formed between the permanent magnets 16.
Since the plurality of permanent magnets 16 are arranged along the circumferential direction of the rotor core 12 on the outer periphery of the rotor core 12, both the magnet torque and the reluctance torque can be increased.

一実施形態では、図２及び図３に示すように、永久磁石１６は直方体を有し、モータ径方向に短辺を有し、モータ周方向に長辺が配置される。第１磁石取付孔１４及び第２磁石取付孔２０は永久磁石１６の断面形状に合わせてモータ周方向に延在し、両端部に第１空隙ｓ１及び第２空隙ｓ２が形成される。   In one embodiment, as shown in FIGS. 2 and 3, the permanent magnet 16 has a rectangular parallelepiped shape, has a short side in the motor radial direction, and a long side is arranged in the motor circumferential direction. The first magnet mounting hole 14 and the second magnet mounting hole 20 extend in the circumferential direction of the motor in accordance with the cross-sectional shape of the permanent magnet 16, and a first gap s1 and a second gap s2 are formed at both ends.

図８は、比較例としての磁石埋め込み型モータ１００を示し、図９は、比較例としての補強板１１８を示す。
図８に示すＩＰＭモータ１００において、磁石取付孔１０６の両端部に形成された磁石取付空間Ｓ０は広い断面積の疑似円形を有する。この磁石取付空間Ｓ０を有する場合、電磁解析上リラクタンストルクを最大限に引き出せ、永久磁石単独での磁力線短絡も抑えられる。ロータコア１０２とステータコア１０４との間のエアギャップを通してステータコア１０４と交差する磁力線の歪みがトルクを生み出す。 FIG. 8 shows a magnet-embedded motor 100 as a comparative example, and FIG. 9 shows a reinforcing plate 118 as a comparative example.
In IPM motor 100 shown in FIG. 8, the magnet mounting space S 0 which are formed at the two ends of the magnet mounting hole 106 has a pseudo-circular wide cross-sectional area. If having the magnet mounting space S 0, provides optimal electromagnetic analysis on reluctance torque, it is also suppressed magnetic lines short circuit the permanent magnet alone. The distortion of the magnetic field lines intersecting the stator core 104 through the air gap between the rotor core 102 and the stator core 104 generates torque.

しかし、磁石取付空間Ｓ０の径方向外側領域を繋ぐ横方向に延在する橋部１０８と、橋部１０８の周方向中間部からロータコア１０２の軸心側へ延在する支柱部１１０とが細くなり、高速回転時に発生する遠心力がこれらの引張強度を超えるおそれがある。そのため、橋部１０８及び支柱部１１０が変形又は破損し、磁石取付孔１０６に取り付けられた永久磁石１１４を保持できないおそれがある。
従って、好ましくは、第１空隙ｓ１を半円形よりリラクタンストルクを増加できる半楕円形とする。半楕円形とすることで、橋部１０８を太くでき、橋部１０８の引張強度を増加できる。また、半楕円形とし、永久磁石単独での磁力線の短絡路を長くすることで、該短絡路を減らしロータコア１２に加わるトルクを増加できる。 However, thin and bridge portion 108 that extends laterally connecting the radially outer region of the magnet mounting space S 0, a post portion 110 extending from the circumferential direction intermediate portion of the bridge portion 108 on the shaft center side of the rotor core 102 Therefore, the centrifugal force generated during high-speed rotation may exceed these tensile strengths. Therefore, the bridge part 108 and the support | pillar part 110 may deform | transform or break, and there exists a possibility that the permanent magnet 114 attached to the magnet attachment hole 106 cannot be hold | maintained.
Therefore, the first gap s1 is preferably a semi-elliptical shape that can increase the reluctance torque from a semi-circular shape. By making it semi-elliptical, the bridge part 108 can be thickened and the tensile strength of the bridge part 108 can be increased. Moreover, by making it a semi-elliptical shape and lengthening the short circuit path of the magnetic field lines of the permanent magnet alone, the short circuit path can be reduced and the torque applied to the rotor core 12 can be increased.

また、図９に示す比較例において、ロータコア板間に介装される補強板１１８に形成される磁石取付孔１２０は永久磁石１１４の断面形状に合わせた矩形を有する。そのため、角部に応力集中が発生しやすく、変形又は破損するおそれがある。   In the comparative example shown in FIG. 9, the magnet mounting hole 120 formed in the reinforcing plate 118 interposed between the rotor core plates has a rectangular shape that matches the cross-sectional shape of the permanent magnet 114. Therefore, stress concentration tends to occur at the corners, and there is a risk of deformation or damage.

一実施形態では、複数の第１磁石取付孔１４及び第２磁石取付孔２０によってロータ軸方向に沿って形成される磁石取付空間に、複数の永久磁石１６がロータ軸方向に沿って直列に配置される。図２では、ＩＰＭモータ１がロータ軸方向で部分的に図示され、ロータ軸方向に１個の永久磁石１６のみが配置されているが、実際は、磁石取付空間において複数の永久磁石１６がロータ軸方向に沿って直列に配置される。
このように、１個の永久磁石１６をロータ軸方向に沿って延在させるのではなく、複数の永久磁石１６をロータ軸方向に沿って直列に配置することで、渦電流の発生を抑制でき、渦電流による発熱を抑制できる。 In one embodiment, a plurality of permanent magnets 16 are arranged in series along the rotor axial direction in a magnet mounting space formed along the rotor axial direction by the plurality of first magnet mounting holes 14 and the second magnet mounting holes 20. Is done. In FIG. 2, the IPM motor 1 is partially illustrated in the rotor axis direction, and only one permanent magnet 16 is disposed in the rotor axis direction. In practice, however, a plurality of permanent magnets 16 are arranged in the rotor mounting direction. Arranged in series along the direction.
In this way, the generation of eddy currents can be suppressed by arranging a plurality of permanent magnets 16 in series along the rotor axial direction instead of extending one permanent magnet 16 along the rotor axial direction. Heat generation due to eddy current can be suppressed.

一実施形態では、複数の補強板１８がロータ軸方向の異なる位置において複数のロータコア板１２ａの間に介装される。即ち、複数の補強板１８がロータ軸方向でロータコア板１２ａの間に分散して配置される。
上記構成によれば、複数の補強板１８をロータ軸方向に分散配置することで、遠心力に対する耐久性をロータコア全体で均一に付与できると共に、補強板１８の数を調整することで、ロータコア１２に必要にして十分な強度を付与できる。 In one embodiment, the plurality of reinforcing plates 18 are interposed between the plurality of rotor core plates 12a at different positions in the rotor axial direction. That is, the plurality of reinforcing plates 18 are arranged in a distributed manner between the rotor core plates 12a in the rotor axial direction.
According to the above configuration, the plurality of reinforcing plates 18 are distributed and arranged in the rotor axial direction, whereby durability against centrifugal force can be uniformly imparted to the entire rotor core, and the number of reinforcing plates 18 can be adjusted to adjust the rotor core 12. Sufficient strength can be imparted if necessary.

一実施形態では、図２及び図３に示すように、１個の永久磁石ごとに、ロータ軸方向に２枚以上の補強板１８が配置される。
これによって、ロータコア１２に付加される遠心力を各ロータコア板１２ａの降伏点未満に抑えることができる。 In one embodiment, as shown in FIGS. 2 and 3, two or more reinforcing plates 18 are disposed in the rotor axial direction for each permanent magnet.
As a result, the centrifugal force applied to the rotor core 12 can be suppressed below the yield point of each rotor core plate 12a.

一実施形態では、第１空隙ｓ１の断面が半楕円形を有する。第１空隙ｓ１の断面を半楕円形とすることで、第１空隙ｓ１を形成するロータコア板１２ａで応力集中が発生するのを回避できる。また、ロータコア板１２ａに加わる遠心力をロータコア板１２ａの降伏点未満に抑えることができる。また、第１空隙ｓ１の断面を半楕円形とすることで、リラクタンストルクを増加できる。   In one embodiment, the cross section of the first gap s1 has a semi-elliptical shape. By making the cross section of the first gap s1 a semi-elliptical shape, it is possible to avoid stress concentration in the rotor core plate 12a that forms the first gap s1. Further, the centrifugal force applied to the rotor core plate 12a can be suppressed to less than the yield point of the rotor core plate 12a. In addition, the reluctance torque can be increased by making the cross section of the first gap s1 a semi-elliptical shape.

一実施形態では、第２空隙ｓ２の断面が半円形又は半楕円形を有する。第２空隙ｓ２の断面を半円形又は半楕円形とすることで、第２空隙ｓ２を形成する補強板１８で応力集中が発生するのを回避でき、かつ補強板１８板に加わる遠心力を降伏点未満に抑えることができる。また、第２空隙ｓ２の断面を半楕円形とすることで、リラクタンストルクを増加でき、半円形とすることで、永久磁石１６の両端方向へのずれを防止できる。   In one embodiment, the cross section of the second gap s2 has a semicircular shape or a semielliptical shape. By making the cross section of the second gap s2 semi-circular or semi-elliptical, it is possible to avoid stress concentration at the reinforcing plate 18 forming the second gap s2, and yield the centrifugal force applied to the reinforcing plate 18 It can be kept below the point. In addition, the reluctance torque can be increased by making the cross section of the second gap s2 a semi-elliptical shape, and the displacement of the permanent magnet 16 in both end directions can be prevented by making the semi-circular shape.

図４〜図７は、ロータコア板１２ａとして磁性の鋼板（電磁鋼板）を用い、補強板１８としてステンレス鋼板を用い、第１空隙ｓ１を半楕円形とし、第２空隙ｓ２を方形、半円形又は半楕円形とした場合に、各ロータコア板１２ａ及び各補強板１８に加わる主応力、及び永久磁石１６に加わる圧縮応力を求めたものである。
図５〜図７の横軸は図４に示す各供試体の番号を示し、図５及び図６の縦軸は、各ロータコア板１２ａに加わる主応力を示し、図７の縦軸は永久磁石１６に加わる圧縮応力を示している。図４において、例えば、補強板１８の枚数／磁石が３個というのは、図３に示すように、永久磁石１個当たりロータ軸方向に永久磁石１６が３個配置される場合を示す。 4-7, a magnetic steel plate (electromagnetic steel plate) is used as the rotor core plate 12a, a stainless steel plate is used as the reinforcing plate 18, the first gap s1 is semi-elliptical, and the second gap s2 is square, semi-circular or The main stress applied to each rotor core plate 12a and each reinforcing plate 18 and the compressive stress applied to the permanent magnet 16 in the case of a semi-elliptical shape are obtained.
The horizontal axis of FIGS. 5-7 shows the number of each test body shown in FIG. 4, the vertical axis | shaft of FIG.5 and FIG.6 shows the main stress added to each rotor core board 12a, and the vertical axis | shaft of FIG. The compressive stress applied to 16 is shown. In FIG. 4, for example, the number of reinforcing plates 18 / three magnets means that three permanent magnets 16 are arranged in the rotor axial direction per permanent magnet as shown in FIG.

図５において、ラインＡはロータコア板１２ａに加わる主応力を示し、点Ｄは、第１磁石取付孔１４及び第２磁石取付孔２０の両端部に図８に示す疑似円形の空隙を有する場合に、ロータコア板１２ａに加わる主応力を示す。ロータコア板１２ａに加わる主応力がロータコア板１２ａの降伏点未満となるのは、番号２、３、５、６及び８である。
従って、図５から、第１空隙ｓ１が半楕円形のとき、補強板１８に形成される第２空隙ｓ２は半円形又は半楕円形とするのがよいことがわかる。また、補強板１８を永久磁石１個当たりロータ軸方向に２枚以上配置するのがよいことがわかる。 In FIG. 5, line A indicates the main stress applied to the rotor core plate 12 a, and point D indicates when the pseudo-circular gap shown in FIG. 8 is provided at both ends of the first magnet mounting hole 14 and the second magnet mounting hole 20. The main stress applied to the rotor core plate 12a is shown. The main stress applied to the rotor core plate 12a is less than the yield point of the rotor core plate 12a in numbers 2, 3, 5, 6, and 8.
Therefore, it can be seen from FIG. 5 that when the first gap s1 is semi-elliptical, the second gap s2 formed in the reinforcing plate 18 is preferably semicircular or semi-elliptical. It can also be seen that two or more reinforcing plates 18 are preferably arranged in the rotor axial direction per permanent magnet.

図６において、ラインＢは補強板１８に加わる主応力を示す。補強板１８に加わる主応力が補強板１８の降伏点未満となるのは、番号２、３、５、６、８及び１０である。
従って、図６から、補強板１８に形成される第２空隙ｓ２の断面は半円形又は半楕円形とするのがよいことがわかる。 In FIG. 6, line B indicates the main stress applied to the reinforcing plate 18. Numbers 2, 3, 5, 6, 8, and 10 are the main stresses applied to the reinforcing plate 18 being less than the yield point of the reinforcing plate 18.
Therefore, it can be seen from FIG. 6 that the cross section of the second gap s2 formed in the reinforcing plate 18 is preferably semicircular or semielliptical.

図７において、ラインＣは永久磁石１６に加わる主応力を示す。永久磁石１６に加わる圧縮応力が磁石抗折力を下回るのは番号２から９までである。従って、図９から、磁石抗折力を下回るために、補強板１８に形成される第２空隙ｓ２の断面は半円形、半楕円形又は方形でもよいことがわかる。また、番号１及び１０で永久磁石１６に加わる主応力が磁石抗折力を上回るので、永久磁石１個当たりロータ軸方向に配置される永久磁石１６の数は２〜４枚とするのがよいことがわかる。   In FIG. 7, line C indicates the main stress applied to the permanent magnet 16. The numbers 2 to 9 indicate that the compressive stress applied to the permanent magnet 16 is lower than the magnet bending force. Therefore, it can be seen from FIG. 9 that the cross section of the second gap s2 formed in the reinforcing plate 18 may be semicircular, semielliptical, or rectangular in order to be less than the magnet bending force. In addition, since the main stress applied to the permanent magnets 16 with numbers 1 and 10 exceeds the magnet bending force, the number of permanent magnets 16 arranged in the rotor axial direction per permanent magnet should be 2 to 4. I understand that.

幾つかの実施形態によれば、磁石埋め込み型モータにおいて、ロータの遠心力に対する耐久性を向上させ、かつロータコアに応力集中が発生するのを抑制し、これによって、ロータコアの変形や永久磁石の飛散を防止できる。   According to some embodiments, in a magnet-embedded motor, durability of the rotor against centrifugal force is improved and stress concentration is suppressed from occurring in the rotor core, thereby preventing deformation of the rotor core and scattering of permanent magnets. Can be prevented.

１、１００ 磁石埋め込み型モータ
１０ 磁石埋め込み型モータ用ロータ
１２、１０２ ロータコア
１２ａ ロータコア板
１４ 第１磁石取付孔
１６、１１４ 永久磁石
１８、１１８ 補強板
２０ 第２磁石取付孔
２２ 取付孔
２４ 回転軸
２６、１０４ ステータコア
２８ コイル
１０２ ロータコア
１０６ 磁石取付孔
１０８ 橋部
１１０ 支柱部
Ｌｍ 磁力線
Ｓ０ 磁石取付空間
ｓ１ 第１空隙
ｓ２ 第２空隙 DESCRIPTION OF SYMBOLS 1,100 Embedded magnet motor 10 Rotor for embedded magnet motors 12, 102 Rotor core 12a Rotor core plate 14 First magnet mounting hole 16, 114 Permanent magnet 18, 118 Reinforcement plate 20 Second magnet mounting hole 22 Mounting hole 24 Rotating shaft 26 , 104 Stator core 28 Coil 102 Rotor core 106 Magnet mounting hole 108 Bridge section 110 Post section Lm Magnetic field line S 0 Magnet mounting space s1 First gap s2 Second gap

Claims (10)

複数のロータコア板をロータ軸方向に沿って積層したロータコアに永久磁石を埋設した磁石埋め込み型モータ用ロータであって、
前記複数のロータコア板の間に介装される補強板と、
前記複数のロータコア板に形成された第１磁石取付孔及び前記補強板に形成された第２磁石取付孔によって前記ロータ軸方向に形成された磁石取付空間に収容された前記永久磁石と、
を備え、
前記第１磁石取付孔及び前記第２磁石取付孔の両端部は連続的な湾曲線で構成された輪郭線を有し、
前記永久磁石の両端と前記第１磁石取付孔の前記輪郭線との間に第１空隙が形成されると共に、前記永久磁石の両端と前記第２磁石取付孔の前記輪郭線との間に第２空隙が形成されることを特徴とする磁石埋め込み型モータ用ロータ。 A rotor for a magnet-embedded motor in which a permanent magnet is embedded in a rotor core obtained by laminating a plurality of rotor core plates along the rotor axial direction,
A reinforcing plate interposed between the plurality of rotor core plates;
The permanent magnet accommodated in the magnet mounting space formed in the rotor axial direction by the first magnet mounting hole formed in the plurality of rotor core plates and the second magnet mounting hole formed in the reinforcing plate;
With
Both ends of the first magnet mounting hole and the second magnet mounting hole have a contour line constituted by a continuous curved line,
A first gap is formed between both ends of the permanent magnet and the contour line of the first magnet mounting hole, and a first gap is formed between both ends of the permanent magnet and the contour line of the second magnet mounting hole. A rotor for a magnet-embedded motor, wherein two gaps are formed. 前記第２空隙の断面積は前記第１空隙の断面積より小さく形成されることを特徴とする請求項１に記載の磁石埋め込み型モータ用ロータ。   The rotor for a magnet-embedded motor according to claim 1, wherein a cross-sectional area of the second air gap is smaller than a cross-sectional area of the first air gap. 複数の前記磁石取付空間が前記ロータコアの外周部で前記ロータコアの周方向に形成され、複数の前記永久磁石が前記複数の磁石取付空間の各々に取り付けられることを特徴とする請求項１又は２に記載の磁石埋め込み型モータ用ロータ。   The plurality of magnet mounting spaces are formed in the circumferential direction of the rotor core at an outer peripheral portion of the rotor core, and the plurality of permanent magnets are mounted in each of the plurality of magnet mounting spaces. The rotor for motors with embedded magnets as described. 前記磁石取付空間において、複数の前記永久磁石が前記ロータ軸方向に沿って直列に配置されることを特徴とする請求項１乃至３の何れか１項に記載の磁石埋め込み型モータ用ロータ。   4. The magnet-embedded motor rotor according to claim 1, wherein a plurality of the permanent magnets are arranged in series along the rotor axial direction in the magnet mounting space. 5. 複数の前記補強板が前記ロータ軸方向の異なる位置において複数のロータコア板の間に介装されることを特徴とする請求項１乃至４の何れか１項に記載の磁石埋め込み型モータ用ロータ。   5. The magnet-embedded motor rotor according to claim 1, wherein the plurality of reinforcing plates are interposed between the plurality of rotor core plates at different positions in the rotor axial direction. １個の前記永久磁石ごとに、前記ロータ軸方向に２枚以上の前記補強板が配置されることを特徴とする請求項５に記載の磁石埋め込み型モータ用ロータ。   6. The rotor for a magnet-embedded motor according to claim 5, wherein two or more reinforcing plates are arranged in the rotor axial direction for each of the permanent magnets. 前記第１空隙が半楕円形を有することを特徴とする請求項１乃至６の何れか１項に記載の磁石埋め込み型モータ用ロータ。   The rotor for a magnet-embedded motor according to any one of claims 1 to 6, wherein the first gap has a semi-elliptical shape. 前記第２空隙の断面が半円形又は半楕円形を有することを特徴とする請求項１乃至７の何れか１項に記載の磁石埋め込み型モータ用ロータ。   8. The rotor for a magnet-embedded motor according to claim 1, wherein a cross section of the second gap has a semicircular shape or a semielliptical shape. 請求項１乃至８の何れか１項に記載の前記磁石埋め込み型モータ用ロータを備えることを特徴とする磁石埋め込み型モータ。   9. A magnet-embedded motor comprising the rotor for a magnet-embedded motor according to any one of claims 1 to 8. 前記磁石埋め込み型モータ用ロータの回転数が１０，０００ｒｐｍ以上であることを特徴とする請求項９に記載の磁石埋め込み型モータ。   10. The magnet-embedded motor according to claim 9, wherein the rotation speed of the magnet-embedded motor rotor is 10,000 rpm or more.
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