JP2007020350A - Magnets-embedded type motor - Google Patents

Magnets-embedded type motor Download PDF

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JP2007020350A
JP2007020350A JP2005201017A JP2005201017A JP2007020350A JP 2007020350 A JP2007020350 A JP 2007020350A JP 2005201017 A JP2005201017 A JP 2005201017A JP 2005201017 A JP2005201017 A JP 2005201017A JP 2007020350 A JP2007020350 A JP 2007020350A
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permanent magnet
rotor
permanent magnets
magnet
space
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Takemi Ueda
雄美 上田
Koichiro Tsuruoka
宏一郎 鶴岡
Satoshi Yasumi
聡 安見
Akira Matsuo
亮 松尾
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnets-embedded type motor which prevents permanent magnets from drifting toward a circumferential direction at rotation of a rotor, while suppressing to the minimum that magnetic flux from the permanent magnets leaks to such portions as between the permanent magnets in a rotor core. <P>SOLUTION: A plurality of insertion holes 23 in which the permanent magnets 22 are inserted and embedded are formed at an inside of a radial direction rather than an outer periphery of the rotor core 21, and space portions 23b and holding wall face portions 23c to hold the permanent magnets 22 are provided at circumferential ends of the insertion holes 23, wherein the space portions are formed so that air gaps may be provided from each end of the permanent magnets 22, in an area from the outer peripheries of the insertion holes 23 up to positions of the inside of the radial direction rather than magnetic pole boundary portions 22a of the permanent magnets 22, and the holding wall face portions are formed at at least a portion between an inside portion of the radial direction of the space portions 23b and inner peripheral portions of the insertion holes 23. Leak of the magnetic flux between the permanent magnets 22 of the rotor core 21 is prevented by the space portions 23b, and the permanent magnets 22 are favorably held to a rotor rotation direction by the holding wall face portions 23c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は磁石埋込型モータに関する。   The present invention relates to a magnet embedded motor.

ブラシレスのモータとして、ロータの表面に永久磁石を配置した表面磁石型モータ（ＳＰＭモータと称す）に代えて、このＳＰＭモータよりも出力特性（トルク特性および加速性）および効率（トルク変換効率）が良い長所を有する磁石埋込型モータ（ＩＰＭモータと称す）が空気調和機の圧縮機や工作機械などにおいて用いられており、電動自転車用モータとしても用いることが検討されている。このＩＰＭモータは、ロータの内部に永久磁石を埋め込む配置としたもので、マグネットトルクに加えて、リラクタンストルクを発生できる性質を有することで、上記長所を発揮できる構成とされている。   As a brushless motor, instead of a surface magnet type motor (referred to as SPM motor) in which permanent magnets are arranged on the surface of the rotor, output characteristics (torque characteristics and acceleration) and efficiency (torque conversion efficiency) are more effective than this SPM motor. A magnet-embedded motor (referred to as an IPM motor) having a good advantage is used in an air conditioner compressor, a machine tool, and the like, and is also considered to be used as an electric bicycle motor. This IPM motor has a configuration in which a permanent magnet is embedded in the rotor, and has a property capable of generating a reluctance torque in addition to a magnet torque, so that the above advantages can be exhibited.

このＩＰＭモータのロータの構造は、図９（ａ）に示すように、板状磁性部材（鉄心）を積層したロータコア１に、永久磁石２を埋め込む挿入孔３を形成し、この挿入孔３に永久磁石２を挿入して埋め込んだ構造である。ここで、永久磁石２を埋め込む挿入孔３の断面形状（モータの軸心に対して直交する面の断面形状）は、永久磁石２の断面形状と同じ形状とされている（例えば、特許文献１等）。   As shown in FIG. 9A, the structure of the rotor of this IPM motor is such that an insertion hole 3 for embedding a permanent magnet 2 is formed in a rotor core 1 in which plate-like magnetic members (iron cores) are laminated. The permanent magnet 2 is inserted and embedded. Here, the cross-sectional shape of the insertion hole 3 for embedding the permanent magnet 2 (the cross-sectional shape of the surface orthogonal to the motor axis) is the same as the cross-sectional shape of the permanent magnet 2 (for example, Patent Document 1). etc).

ところで、ロータコア１をなす鉄心は永久磁石２や空気と比べて極めて高い透磁率を有する。また、永久磁石２はそのロータの外周寄りに位置する面の部分と内周寄りに位置する面の部分とで反対の磁極を有し、また、隣り合う永久磁石２の磁極も異なるように配置されている。したがって、上記のように挿入孔３の形状が永久磁石２の断面形状と同じであると、図９（ｂ）に拡大して示すように、永久磁石２同士が隣接する永久磁石２間のロータコア１の部分（隣接部と称す）１ａで磁気通路が形成されてしまって磁束（磁力線）Φが漏洩し、永久磁石２の外周側部分からの磁束Φが効率的にステータ側に流れず、効率が低下するという課題があった。   Incidentally, the iron core forming the rotor core 1 has extremely high magnetic permeability as compared with the permanent magnet 2 and air. Further, the permanent magnet 2 has opposite magnetic poles in the surface portion located near the outer periphery of the rotor and the surface portion located closer to the inner periphery, and the magnetic poles of the adjacent permanent magnets 2 are also different. Has been. Therefore, if the shape of the insertion hole 3 is the same as the cross-sectional shape of the permanent magnet 2 as described above, the rotor core between the permanent magnets 2 adjacent to each other as shown in FIG. The magnetic path is formed in the portion 1 (referred to as the adjacent portion) 1a, and the magnetic flux (lines of magnetic force) Φ leaks, so that the magnetic flux Φ from the outer peripheral side portion of the permanent magnet 2 does not flow efficiently to the stator side, There has been a problem of lowering.

これに対処する手法として、図１０に示すように、ロータコア１の隣接部１ａにおける挿入孔３のロータ周方向に対する両端部箇所に、挿入孔３に続いて、永久磁石２の厚み方向全幅にわたって空間となるように空間部４を設けることが提案されている（例えば、特許文献２、３等）。   As a technique for coping with this, as shown in FIG. 10, a space is formed across the entire width of the permanent magnet 2 in the thickness direction of the permanent magnet 2 at both ends of the insertion hole 3 in the adjacent portion 1 a of the rotor core 1 with respect to the rotor circumferential direction. It has been proposed to provide the space 4 so as to be (for example, Patent Documents 2 and 3).

この構成によれば、永久磁石２が埋め込まれる挿入孔３に続いて空間部４が設けられるので、この空間部４によりロータコア１の隣接部１ａにおいて磁気通路が形成されなくなって磁束（磁力線）Φの漏洩を防止でき、永久磁石２の外周側部分からの磁束Φが効率的にステータ側に流れて、効率を向上できる。
特開２００２−１０５４１号公報 特開２００４−３２０９８９号公報 特開平５−２３６６８４号公報 According to this configuration, since the space portion 4 is provided following the insertion hole 3 in which the permanent magnet 2 is embedded, a magnetic path is not formed in the adjacent portion 1a of the rotor core 1 by the space portion 4, and the magnetic flux (lines of magnetic force) Φ Leakage can be prevented, and the magnetic flux Φ from the outer peripheral side portion of the permanent magnet 2 efficiently flows to the stator side, thereby improving the efficiency.
JP 2002-10541 A JP 2004-320989 A JP-A-5-236684

しかしながら、図１０に示すように、ロータコア１の隣接部１ａにおいて挿入孔３に続いて空間部４を設けると、磁束（磁力線）Φの漏洩を防止できて効率を向上できるものの、空間部４が永久磁石２の厚み方向全幅にわたって形成されているため、ロータの回転時に永久磁石２が、図１０におけるｃ方向にずれてしまい、ロータとステータとの間に生じる磁気回路の磁気抵抗がばらつき、磁石トルクの変動によるトルクリップルが大きくなる等の不具合を招いてしまう。   However, as shown in FIG. 10, if the space portion 4 is provided in the adjacent portion 1 a of the rotor core 1 following the insertion hole 3, leakage of magnetic flux (lines of magnetic force) Φ can be prevented and efficiency can be improved. Since the permanent magnet 2 is formed over the entire width in the thickness direction, the permanent magnet 2 is displaced in the direction c in FIG. 10 when the rotor is rotated, and the magnetic resistance of the magnetic circuit generated between the rotor and the stator varies. This causes problems such as an increase in torque ripple due to torque fluctuations.

このような不具合を防止する手法としては、前記空間部４に非磁性体と接着剤とを混ぜた充填材を充填することが提案されており（例えば、特許文献３等）、この構成によれば、ロータの回転時でも永久磁石２がずれることを防止できる。しかし、この場合には、非磁性体と接着剤との混合作業や、充填材の充填作業など、多くの手間や時間がかかってしまうとともに、接着剤が硬化するまで、永久磁石を良好な位置に保持しなければならず、この際の位置決めが不良であると、トルクリップルが大きくなる。   As a technique for preventing such a problem, it has been proposed to fill the space portion 4 with a filler mixed with a nonmagnetic material and an adhesive (for example, Patent Document 3). Thus, it is possible to prevent the permanent magnet 2 from shifting even when the rotor rotates. However, in this case, it takes a lot of work and time for mixing the non-magnetic material and the adhesive and filling the filler, and the permanent magnet is placed in a good position until the adhesive is cured. If the positioning at this time is poor, the torque ripple becomes large.

本発明は上記不具合などを解決するもので、永久磁石からの磁束がロータコアにおける永久磁石間の箇所などに漏洩することを最小限に抑えることができながら、ロータの回転時に永久磁石が周方向にずれてしまうことを確実かつ容易に防止することができる磁石埋込型モータを提供することを目的とするものである。   The present invention solves the above-mentioned problems and the like, and it is possible to minimize leakage of magnetic flux from the permanent magnet to a location between the permanent magnets in the rotor core. It is an object of the present invention to provide a magnet-embedded motor that can reliably and easily prevent deviation.

上記課題を解決するために本発明の磁石埋込型モータは、永久磁石を挿入して埋め込む複数の挿入孔をロータコアの外周よりも径方向内側に形成し、前記挿入孔の周方向端部に、挿入孔の外周部から永久磁石の磁極境界部よりも径方向内側の位置まで永久磁石の各端部から空隙をなすように形成された空間部と、この空間部の径方向内側箇所から挿入孔の内周部までの間の少なくとも一部に形成されて、永久磁石を保持する保持壁面部とを設けたことを特徴とする。   In order to solve the above-described problems, an embedded magnet motor according to the present invention has a plurality of insertion holes that are inserted and embedded with permanent magnets radially inward from the outer periphery of the rotor core, and is formed at a circumferential end of the insertion hole. A space part formed so as to form a gap from each end of the permanent magnet from the outer peripheral part of the insertion hole to a position radially inward of the magnetic pole boundary part of the permanent magnet, and inserted from the radially inner part of the space part A holding wall surface portion that is formed in at least a part of the hole up to the inner peripheral portion and holds the permanent magnet is provided.

より具体的には、保持壁面部は、空間部の径方向内側箇所から挿入孔の内周部までにわたって形成され、永久磁石のロータ半径方向に沿って延びる辺の、磁極境界部よりも径方向内側の部分に当接して、永久磁石をロータ回転方向の両側から保持するように構成する。   More specifically, the holding wall surface portion is formed from the radially inner portion of the space portion to the inner peripheral portion of the insertion hole, and is more radial than the magnetic pole boundary portion on the side extending along the rotor radial direction of the permanent magnet. The permanent magnet is configured to be held from both sides in the rotor rotation direction in contact with the inner portion.

この構成により、挿入孔の周方向端部に、挿入孔の外周部から永久磁石の磁極境界部よりも径方向内側の位置まで空間部が形成されているので、この空間部によりロータコアの永久磁石間における、磁極境界部を含めてこの磁極境界部より径方向外側の部分において磁気通路が形成されなくなる。これにより、ロータコアの永久磁石間への磁束の漏洩を防止でき、永久磁石の外周部からの磁束が良好にステータ側に流れて、良好な効率を維持できる。また、挿入孔の周方向端部における空間部の径方向内側箇所から挿入孔の内周部までの間の少なくとも一部に保持壁面部が形成されているので、永久磁石が前記保持壁面部によりロータ回転方向に対して良好に保持され、ロータの回転時でも永久磁石が回転方向にずれることを防止できる。   With this configuration, a space is formed at the circumferential end of the insertion hole from the outer periphery of the insertion hole to a position radially inward from the magnetic pole boundary of the permanent magnet. A magnetic path is not formed in a portion radially outside the magnetic pole boundary portion including the magnetic pole boundary portion. Thereby, the leakage of the magnetic flux between the permanent magnets of the rotor core can be prevented, and the magnetic flux from the outer peripheral portion of the permanent magnet can flow favorably to the stator side, and good efficiency can be maintained. Further, since the holding wall surface portion is formed at least at a part between the radially inner portion of the space portion at the circumferential end portion of the insertion hole and the inner peripheral portion of the insertion hole, the permanent magnet is formed by the holding wall surface portion. It is held well with respect to the rotor rotation direction, and the permanent magnet can be prevented from shifting in the rotation direction even when the rotor rotates.

また、本発明は、永久磁石の表面部から磁極境界部までの寸法をａ、空間部における永久磁石の磁極境界部の周方向端部からの磁極境界線に沿った空隙寸法をｂと設定した場合に、ｂ／ａ≧１であることを特徴とする。   In the present invention, the dimension from the surface part of the permanent magnet to the magnetic pole boundary part is set as a, and the gap dimension along the magnetic pole boundary line from the circumferential end of the magnetic pole boundary part of the permanent magnet in the space part is set as b. In some cases, b / a ≧ 1.

この構成により、永久磁石の磁極境界部の周方向端部での空間部の空隙寸法が大きいので、この空間部が設けられている箇所でのロータコアの永久磁石間の磁束の漏洩を極めて良好に防止することができる。   With this configuration, since the gap size of the space portion at the circumferential end of the magnetic pole boundary portion of the permanent magnet is large, the leakage of magnetic flux between the permanent magnets of the rotor core at the location where this space portion is provided is extremely good. Can be prevented.

以上のように本発明によれば、挿入孔の周方向端部に、挿入孔の外周部から永久磁石の磁極の境界部よりも径方向内側の位置まで永久磁石の端部から空隙をなすように形成された空間部と、この空間部の径方向内側箇所から挿入孔の内周部までの間の少なくとも一部に形成されて、永久磁石を保持する保持壁面部とを設けたので、前記空間部により磁束の漏洩を防止できて、磁石埋込型モータ（ＩＰＭモータ）としての良好な効率を維持することができると同時に、ロータの回転時でも永久磁石が回転方向にずれることを防止できて、磁石トルクの変動によるトルクリップルが生じることを防止でき、良好な出力特性を得ることができる。しかも、前記空間部に接着剤を含む充填材を充填しなくても、永久磁石がロータの回転方向にずれることを防止できるので、充填材の充填作業などを行わなくて済み、これに係る手間や時間を省くできるとともに、接着剤硬化時の位置決め不良によるトルクリップルの発生も防止でき、信頼性も向上する。   As described above, according to the present invention, a gap is formed at the circumferential end of the insertion hole from the end of the permanent magnet from the outer periphery of the insertion hole to the position radially inward from the boundary of the magnetic pole of the permanent magnet. And the holding wall surface portion that holds the permanent magnet is provided at least in part between the radially inner portion of the space portion and the inner peripheral portion of the insertion hole. The space can prevent magnetic flux leakage and maintain good efficiency as a magnet-embedded motor (IPM motor). At the same time, the permanent magnet can be prevented from shifting in the rotational direction even when the rotor is rotating. Thus, it is possible to prevent the occurrence of torque ripple due to fluctuations in magnet torque, and to obtain good output characteristics. In addition, the permanent magnet can be prevented from shifting in the rotational direction of the rotor without filling the space with a filler containing an adhesive, so that it is not necessary to perform a filling operation of the filler. And time can be saved, and torque ripple can be prevented from occurring due to poor positioning when the adhesive is hardened, improving reliability.

また、永久磁石の表面部から磁極境界部までの寸法をａ、空間部における永久磁石の磁極境界部の周方向端部からの磁極境界線に沿った空隙寸法をｂと設定した場合に、ｂ／ａ≧１となるように空間部を形成することで、ロータコアの永久磁石間の磁束の漏洩を極めて良好に防止することができる。   Further, when the dimension from the surface part of the permanent magnet to the magnetic pole boundary part is set to a, and the gap dimension along the magnetic pole boundary line from the circumferential end of the magnetic pole boundary part of the permanent magnet in the space part is set to b, b By forming the space portion so that / a ≧ 1, leakage of magnetic flux between the permanent magnets of the rotor core can be prevented extremely well.

以下、本発明の実施の形態に係る磁石埋込型モータについて、図面を参照しながら説明する。
図１および図２は本発明の実施の形態に係る磁石埋込型モータの概略的な断面図で、図１はモータの回転軸心に沿った面で切断した部分断面外観図、図２は、図１におけるII−II線で切断した断面図である。図３（ａ），（ｂ）は、同磁石埋込型モータのロータの正面図（モータの軸心方向から見た図）および部分切欠側面図である。 Hereinafter, a magnet-embedded motor according to an embodiment of the present invention will be described with reference to the drawings.
1 and 2 are schematic cross-sectional views of a magnet-embedded motor according to an embodiment of the present invention. FIG. 1 is a partial cross-sectional external view taken along a plane along the rotation axis of the motor. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIGS. 3A and 3B are a front view (a view seen from the axial direction of the motor) and a partially cutaway side view of the rotor of the magnet-embedded motor.

図１および図２に示すように、本発明の実施の形態に係るブラシレスＤＣモータでもある磁石埋込型モータは、固定配置されたステータ１０の内側に、回転するロータ２０を配置した構成とされている。ステータ１０は、板状磁性部材（鉄心）を積層した複数（この実施の形態では１２）のステータコア１１にそれぞれステータコイル１２（図１参照）が巻かれて構成されている。また、磁石埋込型モータには、回転軸心方向に対してロータ２０に対向するようにホール素子などからなる位置検出センサ１３が複数設けられ、この位置検出センサ１３によりロータ２０の位置（位相）を検出するようになっている。なお、図１における１５は磁石埋込型モータの回転軸である。   As shown in FIGS. 1 and 2, the embedded magnet motor that is also a brushless DC motor according to the embodiment of the present invention has a configuration in which a rotating rotor 20 is arranged inside a fixedly arranged stator 10. ing. The stator 10 is configured by winding a stator coil 12 (see FIG. 1) around a plurality (12 in this embodiment) of stator cores 11 in which plate-like magnetic members (iron cores) are laminated. In addition, the magnet-embedded motor is provided with a plurality of position detection sensors 13 such as Hall elements so as to face the rotor 20 with respect to the rotational axis direction. ) Is detected. In addition, 15 in FIG. 1 is a rotating shaft of a magnet-embedded motor.

図３、図４（ａ），（ｂ）（図４（ａ）においては、理解しやすいように、一部の挿入孔２３にのみ永久磁石２２が埋め込まれている場合を示しているが、実際には、全ての挿入孔２３に永久磁石２２が埋め込まれている）に示すように、ロータ２０は、板状磁性部材（鉄心）を積層したロータコア２１に、永久磁石２２を埋め込む挿入孔２３を形成し、この挿入孔２３に永久磁石２２を挿入して埋め込んだ構造である。   3, 4 (a), (b) (FIG. 4 (a) shows a case where the permanent magnet 22 is embedded only in a part of the insertion holes 23 for easy understanding. In practice, as shown in FIG. 2, the permanent magnets 22 are embedded in all the insertion holes 23), and the rotor 20 has the insertion holes 23 for embedding the permanent magnets 22 in the rotor core 21 in which plate-like magnetic members (iron cores) are laminated. The permanent magnet 22 is inserted and embedded in the insertion hole 23.

ここで、挿入孔２３には、モータ軸心方向に見て、永久磁石２２の断面形状（この実施の形態では径方向に薄肉で、略回転方向に長い、扁平な長方形状）とほぼ同形状の磁石挿入部２３ａと、この磁石挿入部２３ａの両端部（周方向に対して両端となる箇所）に臨む箇所に、磁石挿入部２３ａと続いてそれぞれ形成された空間部２３ｂと、永久磁石２２を保持する保持壁面部２３ｃとが設けられている。そして、空間部２３ｂは、挿入孔２３の外周部から永久磁石２２の磁極境界部２２ａよりも径方向内側の位置まで形成されており、この空間部２３ｂにより永久磁石２２の端部から略ロータ回転方向に対して空隙をなすように配置されている。また、この空間部２３ｂの径方向内側箇所から挿入孔２３の内周部までの間が保持壁面部２３ｃとされ、この保持壁面部２３ｃが、永久磁石２２のロータ半径方向に沿って延びる辺の、磁極境界部２２ａよりも径方向内側の部分に当接して、永久磁石２２をロータ回転方向の両側から保持するように構成されている。   Here, the insertion hole 23 has substantially the same shape as the cross-sectional shape of the permanent magnet 22 (in this embodiment, a thin rectangular shape in the radial direction and long in the rotation direction). The magnet insertion portion 23a, the space 23b formed respectively following the magnet insertion portion 23a, and the permanent magnet 22 at locations facing both ends of the magnet insertion portion 23a (locations opposite to the circumferential direction). A holding wall surface portion 23c is provided. The space portion 23b is formed from the outer peripheral portion of the insertion hole 23 to a position radially inward of the magnetic pole boundary portion 22a of the permanent magnet 22, and the rotor portion substantially rotates from the end portion of the permanent magnet 22 by the space portion 23b. It arrange | positions so that the space | gap may be made | formed with respect to a direction. A space between the radially inner portion of the space portion 23 b and the inner peripheral portion of the insertion hole 23 is a holding wall surface portion 23 c, and the holding wall surface portion 23 c is a side extending along the rotor radial direction of the permanent magnet 22. The permanent magnet 22 is configured to be held from both sides in the rotor rotational direction by contacting the radially inner portion of the magnetic pole boundary 22a.

なお、図５に示すように、この実施の形態においては、空間部２３ｂが形成されている箇所は、概略的に、永久磁石２２の磁極境界部２２ａに対応する箇所が永久磁石２２の端部から最も離れる円弧形状とされている。   As shown in FIG. 5, in this embodiment, the portion where the space 23 b is formed is roughly the portion corresponding to the magnetic pole boundary 22 a of the permanent magnet 22. The arc shape is farthest from the arc.

また、永久磁石２２の表面部２２ｂから磁極境界部２２ａまでの寸法（すなわち、永久磁石２２の半径方向寸法の半分の幅）をａ、空間部２３ｂにおける永久磁石２２の磁極境界部２２ａの周方向端部から磁極境界部２２ａのラインに沿った空隙寸法をｂと設定した場合に、ｂ／ａ≧１となる形状に空間部２３ｂが形成されている。   Further, a dimension from the surface portion 22b of the permanent magnet 22 to the magnetic pole boundary portion 22a (that is, a width that is half of the radial direction dimension of the permanent magnet 22) is a, and the circumferential direction of the magnetic pole boundary portion 22a of the permanent magnet 22 in the space portion 23b. When the gap dimension along the line of the magnetic pole boundary portion 22a from the end portion is set as b, the space portion 23b is formed in a shape satisfying b / a ≧ 1.

また、図６（ａ），（ｂ）に示すように、この実施の形態においては、磁石挿入部２３における内周寄りの辺２３ｆの一部に僅かに外径方向に突出する突起部２３ｄが形成され（この実施の形態では、ロータコア２１を形成する板状磁性部材に同形状に突起部２３ｄが形成されて積層され、モータ軸心方向に対して突起部２３ｄが繋がるように形成されている）、これにより、磁石挿入部２３に永久磁石２２が挿入された際に、磁石挿入部２３における内周寄りの辺２３ｆに対してはその突起部２３ｄの突出距離ｔ分、永久磁石２２との間に隙間を生じてその磁力が少なめにしか作用しないようになっている一方、磁石挿入部２３における外周寄りの辺２３ｅには永久磁石２２が隙間無く接し、その永久磁石２２の磁力により、ロータコア２１における前記外周寄りの辺２３ｅの箇所に密着して固定されるように構成されている。   Further, as shown in FIGS. 6A and 6B, in this embodiment, a protrusion 23d slightly protruding in the outer diameter direction is formed on a part of the side 23f near the inner periphery of the magnet insertion portion 23. (In this embodiment, the protrusions 23d are formed in the same shape on the plate-like magnetic member forming the rotor core 21 and stacked so that the protrusions 23d are connected to the motor axis direction. Thus, when the permanent magnet 22 is inserted into the magnet insertion portion 23, the protrusion 23d has a protrusion distance t corresponding to the inner peripheral side 23f of the magnet insertion portion 23. On the other hand, a permanent magnet 22 is in contact with the side 23e near the outer periphery of the magnet insertion portion 23 without a gap, and a rotor core is formed by the magnetic force of the permanent magnet 22 while a gap is created between them. 2 And it is configured to be secured in close contact with portions of the outer peripheral side of the side 23e in.

上記構成によれば、周方向に沿う挿入孔２３の両端部に、挿入孔２３の外周部から永久磁石２２の磁極境界部２２ａよりも径方向内側の位置まで空間部２３ｂが形成されているので、図７に示すように、この空間部２３ｂにより、ロータコア２１の永久磁石２２間における磁極境界部２２ａを含めてこの磁極境界部２２ａより径方向外側の部分において磁気通路が形成されなくなって、ロータコア２１の永久磁石間の箇所（隣接部と称す）２１ａへの磁束Φの漏洩を防止できる。したがって、永久磁石２２の外周側部分からの磁束Φが効率的にステータ１０側に流れて、良好な効率を維持できる。   According to the above configuration, the space 23b is formed at both ends of the insertion hole 23 along the circumferential direction from the outer periphery of the insertion hole 23 to a position radially inward from the magnetic pole boundary 22a of the permanent magnet 22. As shown in FIG. 7, the space 23 b prevents a magnetic path from being formed in a portion radially outside the magnetic pole boundary 22 a including the magnetic pole boundary 22 a between the permanent magnets 22 of the rotor core 21. Leakage of the magnetic flux Φ to a portion (referred to as an adjacent portion) 21a between the 21 permanent magnets 21a can be prevented. Therefore, the magnetic flux Φ from the outer peripheral side portion of the permanent magnet 22 efficiently flows to the stator 10 side, and good efficiency can be maintained.

また、この場合に、永久磁石２２の表面部２２ｂから磁極境界部２２ａまでの寸法をａ、空間部２３ｂにおける永久磁石２２の磁極境界部２２ａの周方向端部から磁極境界部２２ａのラインに沿った空隙寸法をｂと設定した場合に、ｂ／ａ≧１となる形状に空間部２３ｂを形成しているので、この空間部２３ｂが設けられている箇所でのロータコア２１の永久磁石間の隣接部２１ａでの磁束の漏洩を極めて良好に防止することができる。   In this case, the dimension from the surface portion 22b of the permanent magnet 22 to the magnetic pole boundary portion 22a is a, and along the line of the magnetic pole boundary portion 22a from the circumferential end of the magnetic pole boundary portion 22a of the permanent magnet 22 in the space portion 23b. When the gap dimension is set to b, the space portion 23b is formed in a shape satisfying b / a ≧ 1, and therefore, adjacent to the permanent magnets of the rotor core 21 at the location where the space portion 23b is provided. Magnetic flux leakage at the portion 21a can be prevented very well.

つまり、永久磁石２２のＮ極とＳ極とを分離する磁極境界部（磁極中立帯部分）２２ａの近傍では、空間部２３ｂの空隙寸法ｂは、永久磁石２２から発せられる総磁束の有効度合いに大きく影響するため、この空隙寸法Ｌとして適正な値を選ぶことが重要である。   That is, in the vicinity of the magnetic pole boundary portion (magnetic pole neutral zone portion) 22 a that separates the N pole and the S pole of the permanent magnet 22, the air gap dimension b of the space portion 23 b corresponds to the effective degree of the total magnetic flux generated from the permanent magnet 22. It is important to select an appropriate value as the gap dimension L because it greatly affects.

ここで、図８は、前記ｂ／ａの値（空隙寸法比率と称す）を横軸にとり、有効磁束量の度合いを縦軸にとった場合の特性を示している。実際には、ロータ２０を外部から回転駆動させることにより、ロータ２０と対となるステータ１０におけるステータコア１１のステータコイル１２に、誘起されて発生する電圧「誘起電圧」を測定して図８に示す相関データを得た。なお、誘起電圧比率は、前記空隙寸法ｂが、永久磁石２２の表面部２２ｂから磁極境界部２２ａまでの寸法ａに比べて、大幅に大きいときの誘起電圧の値（いわゆる飽和値）を１として表現している。   Here, FIG. 8 shows characteristics when the horizontal axis represents the value of b / a (referred to as the gap size ratio) and the vertical axis represents the degree of effective magnetic flux. Actually, by rotating the rotor 20 from the outside, a voltage “induced voltage” induced and generated in the stator coil 12 of the stator core 11 in the stator 10 paired with the rotor 20 is measured and shown in FIG. Correlation data was obtained. The induced voltage ratio is set to 1 when the air gap dimension b is significantly larger than the dimension a from the surface portion 22b of the permanent magnet 22 to the magnetic pole boundary portion 22a (so-called saturation value). expressing.

図８に示すように、ｂ／ａ≧１となる形状に空間部２３ｂを形成することで、空間部２３ｂが設けられている箇所でのロータコア２１の永久磁石間の隣接部２１ａでの磁束の漏洩を極めて良好に防止できることがわかる。   As shown in FIG. 8, by forming the space portion 23b in a shape satisfying b / a ≧ 1, the magnetic flux at the adjacent portion 21a between the permanent magnets of the rotor core 21 at the location where the space portion 23b is provided. It can be seen that leakage can be prevented very well.

また、挿入孔２３の両端部における空間部２３ｂの径方向内側箇所から挿入孔２３の内周部までの間に保持壁面部２３ｃが形成されているので、永久磁石２２が保持壁面部２３ｃによりロータ回転方向に対して良好に保持され、ロータ２０の回転時でも永久磁石２２が回転方向にずれることを防止できる。   Further, since the holding wall surface portion 23c is formed between the radially inner portion of the space portion 23b at the both ends of the insertion hole 23 and the inner peripheral portion of the insertion hole 23, the permanent magnet 22 is rotated by the holding wall surface portion 23c. It is held well with respect to the rotation direction, and the permanent magnet 22 can be prevented from shifting in the rotation direction even when the rotor 20 is rotated.

この結果、磁石埋込型モータ（ＩＰＭモータ）としての良好な効率を維持することができると同時に、ロータ２０の回転時でも永久磁石２２が回転方向にずれることを防止できて、磁石トルクの変動によるトルクリップルが生じることを防止でき、良好な出力特性を得ることができる。   As a result, good efficiency as an embedded magnet motor (IPM motor) can be maintained, and at the same time, the permanent magnet 22 can be prevented from shifting in the rotating direction even when the rotor 20 rotates, and the fluctuation of the magnet torque can be prevented. The torque ripple caused by the above can be prevented and good output characteristics can be obtained.

また、従来のように空間部に接着剤を含む充填材を充填しなくても、永久磁石２２が略ロータ回転方向にずれることを防止できるので、充填材の充填作業などを行わなくて済んで、これに係る手間や時間を省くことができるとともに、接着剤硬化時の位置決め不良によるトルクリップルの発生も防止でき、これによっても磁石埋込型モータとしての信頼性も向上する。   Further, since the permanent magnet 22 can be prevented from shifting substantially in the rotor rotation direction without filling the space with a filler containing an adhesive as in the prior art, it is not necessary to perform a filling operation or the like. In addition, it is possible to save labor and time related to this, and it is possible to prevent the occurrence of torque ripple due to poor positioning during curing of the adhesive, thereby improving the reliability as a magnet-embedded motor.

なお、上記の実施の形態では、挿入孔２３の両端部分における空間部２３ｂの径方向内側箇所から挿入孔２３の内周部までの間の全ての領域に保持壁面部２３ｃが形成されている場合を述べたが、これに限るものではなく、挿入孔２３の両端部分における空間部２３ｂの径方向内側箇所から挿入孔２３の内周部までの間の一部の領域だけに保持壁面部２３ｃを形成しても、永久磁石２２が略ロータ回転方向にずれることを防止できる。しかし、良好に永久磁石２２の位置決めを行って保持するためには、できるだけ、保持壁面部２３ｃの面積が大きいことが望ましい。   In the above-described embodiment, when the holding wall surface portion 23c is formed in the entire region from the radially inner portion of the space portion 23b to the inner peripheral portion of the insertion hole 23 at both end portions of the insertion hole 23. However, the present invention is not limited to this, and the holding wall portion 23c is provided only in a partial region between the radially inner portion of the space portion 23b and the inner peripheral portion of the insertion hole 23 at both end portions of the insertion hole 23. Even if formed, the permanent magnet 22 can be prevented from shifting substantially in the rotor rotation direction. However, in order to satisfactorily position and hold the permanent magnet 22, it is desirable that the area of the holding wall surface portion 23c be as large as possible.

また、上記の実施の形態では、永久磁石２２として断面長方形状のものを用いた場合を述べ、この場合には、永久磁石２２として安価なものを用いることができるとともに、挿入孔２３の形状も比較的単純な形状となって、製造コストの増加を最小限に抑えることができる利点がある。しかし、これに限るものではなく、例えば、永久磁石２２として断面円弧形状のものを用いる場合でも、上記空間部２３ｂや保持壁面部２３ｃの構成を適用することは可能である。   In the above embodiment, the case where a permanent magnet 22 having a rectangular cross section is used is described. In this case, an inexpensive permanent magnet 22 can be used, and the shape of the insertion hole 23 is also set. There is an advantage that a relatively simple shape can be obtained and an increase in manufacturing cost can be minimized. However, the present invention is not limited to this. For example, even when a permanent magnet 22 having a circular arc shape is used, the configuration of the space portion 23b and the holding wall surface portion 23c can be applied.

さらに、上記の実施の形態では、挿入孔２３の周方向両端部に空間部２３ｂを設けた場合を述べ、これにより、ロータコア２１の全ての永久磁石間の隣接部２１ａでの磁束Φの漏洩を防止できるため、極めて良好な効率を維持できる利点を有するが、これに限るものではなく、挿入孔２３の周方向の一方のみの端部に空間部２３ｂを設けてもよく、この場合でも、空間部２３ｂを全く設けない場合と比較すると、ロータコア２１の永久磁石間の隣接部２１ａにおける空間部２３ｂを設けた箇所での磁束Φの漏洩を防止できるため、良好な効率を維持できる効果がある。   Furthermore, in the above embodiment, the case where the space portions 23b are provided at both circumferential ends of the insertion hole 23 is described, and thereby leakage of the magnetic flux Φ at the adjacent portions 21a between all the permanent magnets of the rotor core 21 is described. However, the present invention is not limited to this, and the space 23b may be provided at only one end in the circumferential direction of the insertion hole 23. Compared to the case where no portion 23b is provided, leakage of the magnetic flux Φ at the location where the space portion 23b is provided in the adjacent portion 21a between the permanent magnets of the rotor core 21 can be prevented, so that there is an effect that good efficiency can be maintained.

本発明は、空気調和機の圧縮機や工作機械、さらには電動自転車用モータとしての磁石埋込型モータに最適であるが、その他の用途に用いられる磁石埋込型モータにも適用可能である。   The present invention is most suitable for an air conditioner compressor and machine tool, and also an embedded magnet motor as a motor for an electric bicycle, but can also be applied to an embedded magnet motor used for other purposes. .

本発明の実施の形態に係る磁石埋込型モータの概略的な断面図で、モータの回転軸心に沿った面で切断した部分断面外観図1 is a schematic cross-sectional view of a magnet-embedded motor according to an embodiment of the present invention, and is a partial cross-sectional external view cut along a plane along the rotation axis of the motor. 同磁石埋込型モータの概略的な断面図で、図１におけるII−II線で切断した断面図FIG. 2 is a schematic cross-sectional view of the magnet-embedded motor, taken along line II-II in FIG. （ａ）および（ｂ）は、同磁石埋込型モータのロータの正面図（モータの軸心方向から見た図）および部分切欠側面図(A) And (b) is the front view (figure seen from the axial direction of a motor) of a rotor of the magnet embedding type motor, and a partial notch side view （ａ）および（ｂ）は、同磁石埋込型モータのロータの正面図（モータの軸心方向から見た図）およびその拡大図(A) And (b) is a front view (figure seen from the axial direction of the motor) of the rotor of the magnet embedded motor and its enlarged view 同磁石埋込型モータのロータの要部拡大図Enlarged view of the main part of the rotor of the magnet embedded motor （ａ）および（ｂ）は、同磁石埋込型モータのロータの要部正面図およびその拡大図(A) And (b) is the principal part front view of the rotor of the magnet embedded motor, and its enlarged view 同磁石埋込型モータのロータの要部拡大図Enlarged view of the main part of the rotor of the magnet embedded motor 空隙寸法比率を横軸にとり、有効磁束量の度合いを縦軸にとった場合の特性を示す図Diagram showing characteristics when the gap dimension ratio is on the horizontal axis and the amount of effective magnetic flux is on the vertical axis （ａ）および（ｂ）は、従来の磁石埋込型モータを示す図およびその要部拡大図(A) And (b) is a figure which shows the conventional magnet embedded motor, and its principal part enlarged view 他の従来の磁石埋込型モータの要部を示す図The figure which shows the principal part of another conventional magnet-embedded motor

符号の説明Explanation of symbols

１０ ステータ
１１ ステータコア
１２ ステータコイル
１３ 位置検出センサ
１５ 回転軸
２０ ロータ
２１ ロータコア
２１ａ 隣接部
２２ 永久磁石
２２ａ 磁極境界部
２３ 挿入孔
２３ａ 磁石挿入部
２３ｂ 空間部
２３ｃ 保持壁面部
２３ｄ 突起部 DESCRIPTION OF SYMBOLS 10 Stator 11 Stator core 12 Stator coil 13 Position detection sensor 15 Rotating shaft 20 Rotor 21 Rotor core 21a Adjacent part 22 Permanent magnet 22a Magnetic pole boundary part 23 Insertion hole 23a Magnet insertion part 23b Space part 23c Holding wall part 23d Protrusion part

Claims (3)

永久磁石を挿入して埋め込む複数の挿入孔をロータコアの外周よりも径方向内側に形成し、前記挿入孔の周方向端部に、挿入孔の外周部から永久磁石の磁極境界部よりも径方向内側の位置まで永久磁石の各端部から空隙をなすように形成された空間部と、この空間部の径方向内側箇所から挿入孔の内周部までの間の少なくとも一部に形成されて、永久磁石を保持する保持壁面部とを設けた磁石埋込型モータ。 A plurality of insertion holes for inserting and embedding permanent magnets are formed radially inward from the outer periphery of the rotor core, and at the circumferential end of the insertion hole, the outer periphery of the insertion hole is more radial than the magnetic pole boundary of the permanent magnet. It is formed in at least a part between the space part formed so as to form a gap from each end part of the permanent magnet to the inner position, and the inner peripheral part of the insertion hole from the radially inner position of this space part, A magnet-embedded motor provided with a holding wall portion for holding a permanent magnet. 保持壁面部は、空間部の径方向内側箇所から挿入孔の内周部までにわたって形成され、永久磁石のロータ半径方向に沿って延びる辺の、磁極境界部よりも径方向内側の部分に当接して、永久磁石をロータ回転方向の両側から保持する請求項１に記載の磁石埋込型モータ。 The holding wall surface portion is formed from the radially inner portion of the space portion to the inner peripheral portion of the insertion hole, and abuts against a portion on the radially inner side from the magnetic pole boundary portion of the side extending along the rotor radial direction of the permanent magnet. The permanent magnet motor according to claim 1, wherein the permanent magnet is held from both sides in the rotor rotation direction. 永久磁石の表面部から磁極境界部までの寸法をａ、空間部における永久磁石の磁極境界部の周方向端部からの磁極境界線に沿った空隙寸法をｂと設定した場合に、ｂ／ａ≧１である請求項１または２に記載の磁石埋込型モータ。 When the dimension from the surface part of the permanent magnet to the magnetic pole boundary part is set to a, and the gap dimension along the magnetic pole boundary line from the circumferential end of the magnetic pole boundary part of the permanent magnet in the space part is set to b, b / a The embedded magnet motor according to claim 1, wherein ≧ 1.
JP2005201017A 2005-07-11 2005-07-11 Magnets-embedded type motor Pending JP2007020350A (en)

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JP2009112181A (en) * 2007-11-01 2009-05-21 Nissan Motor Co Ltd Rotator of permanent magnet type motor
JP2010063277A (en) * 2008-09-04 2010-03-18 Aisin Seiki Co Ltd Rotor
CN102222995A (en) * 2010-04-14 2011-10-19 上海日立电器有限公司 Permanent magnet motor stator rotor structure for compressor
CN102222996A (en) * 2010-04-14 2011-10-19 上海日立电器有限公司 A permanent magnet motor rotor used in compressor
KR101221251B1 (en) * 2012-03-30 2013-01-11 하이젠모터 주식회사 Rotor of interior permanent magnet motor
JP2014007925A (en) * 2012-06-27 2014-01-16 Toyota Boshoku Corp Method for manufacturing rotor core
US20150130317A1 (en) * 2013-11-12 2015-05-14 Hon Hai Precision Industry Co., Ltd. Rotor and motor using the same

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JP2000197292A (en) * 1998-10-21 2000-07-14 Mitsubishi Electric Corp Permanent-magnet rotor of permanent-magnet mounted motor
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JP2003309953A (en) * 2002-04-15 2003-10-31 Denso Corp Permanent magnet rotor for inner rotor type rotary electric machine

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JPH10126985A (en) * 1996-10-18 1998-05-15 Hitachi Ltd Permanent magnet dynamo-electric machine and motor-driven vehicle using the same
JPH11355985A (en) * 1998-06-04 1999-12-24 Toshiba Corp Permanent magnet type motor
JP2000197292A (en) * 1998-10-21 2000-07-14 Mitsubishi Electric Corp Permanent-magnet rotor of permanent-magnet mounted motor
JP2001178047A (en) * 2000-10-31 2001-06-29 Hitachi Ltd Permanent-magnet dynamo-electric machine, and motor vehicle using the permanent-magnet dynamo-electric machine
JP2003309953A (en) * 2002-04-15 2003-10-31 Denso Corp Permanent magnet rotor for inner rotor type rotary electric machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009112181A (en) * 2007-11-01 2009-05-21 Nissan Motor Co Ltd Rotator of permanent magnet type motor
JP2010063277A (en) * 2008-09-04 2010-03-18 Aisin Seiki Co Ltd Rotor
CN102222995A (en) * 2010-04-14 2011-10-19 上海日立电器有限公司 Permanent magnet motor stator rotor structure for compressor
CN102222996A (en) * 2010-04-14 2011-10-19 上海日立电器有限公司 A permanent magnet motor rotor used in compressor
KR101221251B1 (en) * 2012-03-30 2013-01-11 하이젠모터 주식회사 Rotor of interior permanent magnet motor
JP2014007925A (en) * 2012-06-27 2014-01-16 Toyota Boshoku Corp Method for manufacturing rotor core
US9755489B2 (en) 2012-06-27 2017-09-05 Toyota Boshoku Kabushiki Kaisha Method for manufacturing rotor core
US20150130317A1 (en) * 2013-11-12 2015-05-14 Hon Hai Precision Industry Co., Ltd. Rotor and motor using the same

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