JP2014003785A - Permanent magnet type rotary electrical machine - Google Patents

Permanent magnet type rotary electrical machine Download PDF

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JP2014003785A
JP2014003785A JP2012136832A JP2012136832A JP2014003785A JP 2014003785 A JP2014003785 A JP 2014003785A JP 2012136832 A JP2012136832 A JP 2012136832A JP 2012136832 A JP2012136832 A JP 2012136832A JP 2014003785 A JP2014003785 A JP 2014003785A
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magnet
permanent magnet
holding member
rotor
permanent
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Shinya Yamakawa
晋弥 山川
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Fuji Electric Co Ltd
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Fuji Electric Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet type rotary electrical machine capable of preventing or suppressing scattering of a permanent magnet in a magnet insertion slot and breakage of a rotor core.SOLUTION: A plurality of magnet insertion slots 3 penetrating in a rotor core 2 of a rotor 1 in the axial direction are formed, and a pair of permanent magnets 4 are inserted with respect to each magnet insertion slot 3 so that magnetic poles adjoining each other in a circumferential direction may have opposite polarities. The plurality of magnet insertion slots 3 are divided mutually in the same pole side of the magnetic pole of the permanent magnet 4 and arranged in a polygonal shape, and each magnet insertion slot 3 has a dividing part 6a which divides each magnet insertion slot shape into right and left at a magnetic pole center position which is a different pole side of the magnetic pole of the pair of permanent magnets 4, and an inner circumference shape of the corner of the dividing part 6a is made to be a curved surface shape, and a magnet holding member 7 having spring elasticity is interposed between the dividing part 6a and the permanent magnet 4.

Description

本発明は、固定子と、その固定子に対し所定の空隙を有して対向する回転子とを備えた永久磁石式回転電機に関する。   The present invention relates to a permanent magnet type rotating electrical machine including a stator and a rotor facing the stator with a predetermined gap.

永久磁石式回転電機の一例として埋込磁石形の回転電機を例示できる。埋込磁石形の永久磁石式回転電機は、円筒状フレームの内周側に固定子が配置され、この固定子の内周側に所定の空隙を隔てて回転子が配置される。回転子は回転軸に支持されて回転自在とされる。回転子は、その回転子鉄心内に自身軸方向に貫通して形成された複数の磁石挿入スロットを有し、各磁石挿入スロットに永久磁石が装着される。この種の永久磁石式回転電機は、永久磁石から発生する磁束を、固定子に備える励磁コイルとの鎖交磁束量に応じて発生するマグネットトルクと、回転子鉄心の磁気抵抗（リラクタンス）とを利用する。この種の永久磁石式回転電機は、小型で高出力、高効率な回転電機として広く用いられている。   An example of a permanent magnet type rotating electrical machine is an embedded magnet type rotating electrical machine. In the permanent magnet type rotating electric machine of the embedded magnet type, a stator is disposed on the inner peripheral side of the cylindrical frame, and the rotor is disposed on the inner peripheral side of the stator with a predetermined gap. The rotor is supported by a rotating shaft and is rotatable. The rotor has a plurality of magnet insertion slots formed in the rotor iron core so as to penetrate in the axial direction, and a permanent magnet is mounted in each magnet insertion slot. This type of permanent magnet type rotating electrical machine generates a magnetic torque generated from a permanent magnet according to the amount of magnetic flux linkage with an exciting coil provided in a stator, and a magnetic resistance (reluctance) of a rotor core. Use. This type of permanent magnet rotating electric machine is widely used as a rotating electric machine that is small, has a high output, and is highly efficient.

ところで、この種の永久磁石式回転電機において、特に耐振動用途、耐衝撃用途、高速回転用途などでは、回転子鉄心が、外部荷重や、遠心力、シャフトと回転子鉄心の締め代などにより発生する応力に耐えうる構造としなければならない。ここで、上記磁石挿入スロットの横断面形状が、例えば長方形等である場合、その長方形状の角部に応力が集中し、永久磁石の飛散や、回転子鉄心の破損が生じるおそれがある。   By the way, in this type of permanent magnet type rotating electrical machine, especially in vibration-proof applications, shock-proof applications, high-speed rotation applications, etc., the rotor core is generated by external load, centrifugal force, shaft and rotor core tightening margin, etc. The structure must be able to withstand the stress. Here, when the cross-sectional shape of the magnet insertion slot is, for example, a rectangle or the like, stress concentrates on the corners of the rectangle, and the permanent magnet may be scattered or the rotor core may be damaged.

以下、従来の回転子の横断面形状を図１６および図１７に示す例を参照して説明する。なお、図１６、１７では、永久磁石式回転電機のうち、回転子の一極分の図を表し、固定子を含む回転電機全体の図示は省略している。
図１６に示すように、従来の回転子１０１は、磁石挿入スロット１０３内での永久磁石４の動きを拘束する係止部として、周方向に離隔して対向配置された一対の磁石ストッパー部９ａ，９ｂを有する。一対の磁石ストッパー部９ａ，９ｂは、相互の段部間に挿入された永久磁石４を段部で挟持することで永久磁石４を固定するようになっている。そのため、この磁石ストッパー部９ａ，９ｂの段部の角部に応力が集中する。 Hereinafter, the cross-sectional shape of a conventional rotor will be described with reference to the examples shown in FIGS. 16 and 17 show one pole of the rotor among the permanent magnet type rotating electric machines, and the entire rotating electric machine including the stator is not shown.
As shown in FIG. 16, the conventional rotor 101 is a pair of magnet stopper portions 9 a that are opposed to each other in the circumferential direction as locking portions that restrain the movement of the permanent magnet 4 in the magnet insertion slot 103. , 9b. The pair of magnet stopper portions 9a and 9b is configured to fix the permanent magnet 4 by sandwiching the permanent magnet 4 inserted between the step portions between the step portions. Therefore, stress concentrates on the corners of the step portions of the magnet stopper portions 9a and 9b.

ここで、磁石挿入スロット３が回転中心のシャフト５に向かって多角形状に配置されている場合、前記ストッパー部９ａ，９ｂの段部角部での応力集中は、各磁石挿入スロット３における磁極中央のブリッジ（分割部）６の基端部に形成されている磁石ストッパー部９ａの角部に発生する。これは、複数の磁石挿入スロット３が全体として多角形状に配置されることで、磁極中央側の磁石ストッパー部９ａの角部の、回転中心を基準とする径方向の位置Ｒ１が、周方向において反対側の磁石ストッパー部９ｂの角部の、回転中心を基準とする径方向の位置Ｒ２と比べて径方向寸法が小さい配置となり（図１６参照）、Ｒ１＜Ｒ２の関係が成り立つことによる。つまり、円筒形状の周方向締め代（δ）における応力（σ）は、以下の（式１）で概略表わされる。
σ＝Ｅ×（δ／ｒ）×（δ／Ｒ） （式１）
ただし、Ｅ：ヤング率、δ：締め代、ｒ：内径、Ｒ：外径、である。
（式１）から、外径Ｒの値が小さいほど、締め代（δ）により発生する応力（σ）が大きくなることがわかる。 Here, when the magnet insertion slot 3 is arranged in a polygonal shape toward the rotation center shaft 5, the stress concentration at the corners of the step portions of the stopper portions 9a and 9b is the center of the magnetic pole in each magnet insertion slot 3. This occurs at the corner of the magnet stopper portion 9a formed at the base end of the bridge (divided portion) 6. This is because the plurality of magnet insertion slots 3 are arranged in a polygonal shape as a whole, so that the radial position R1 of the corner portion of the magnet stopper portion 9a on the magnetic pole center side with respect to the rotation center is the circumferential direction. This is because the corner portion of the opposite magnet stopper portion 9b has a smaller radial dimension than the radial position R2 with respect to the rotation center (see FIG. 16), and the relationship of R1 <R2 is established. That is, the stress (σ) at the cylindrical circumferential interference (δ) is schematically represented by the following (Equation 1).
σ = E × (δ / r) × (δ / R) (Formula 1)
However, E: Young's modulus, δ: interference, r: inner diameter, R: outer diameter.
From (Equation 1), it can be seen that the smaller the value of the outer diameter R, the greater the stress (σ) generated by the interference (δ).

また、回転子の回転に伴う遠心力（Ｆ）は以下の（式２）で表される。
Ｆ＝ｍ・ｒａ・ω2 （式２）
ただし、ｍ：質量、ｒａ：重心半径、ω：回転速度である。つまり、図１７に示すように、回転子鉄心１０２に加わる遠心力の重心位置Ｇ、およびその重心位置Ｇと極中央側のブリッジ６との位置関係から、純粋な遠心力は極中央側のブリッジ６が負担することとなり、やはり磁石挿入スロット３の磁極中央側の磁石ストッパー部９ａの角部の応力が高くなる。 Moreover, the centrifugal force (F) accompanying rotation of a rotor is represented by the following (Formula 2).
F = m · ra · ω 2 (Formula 2)
Where m is mass, ra is radius of center of gravity, and ω is rotational speed. That is, as shown in FIG. 17, from the position of the center of gravity G of the centrifugal force applied to the rotor core 102 and the positional relationship between the position G of the center of gravity G and the bridge 6 on the pole center side, the pure centrifugal force is 6, the stress at the corner of the magnet stopper portion 9a on the magnetic pole center side of the magnet insertion slot 3 is also increased.

このように、この種の永久磁石式回転電機においては、シャフト５と回転子鉄心１０２の締め代（δ）により発生する応力（σ）が極中央側のブリッジ６の近傍に発生するとともに、回転子の回転に伴う遠心力（Ｆ）から発生する応力が、主に極中央側のブリッジ６の近傍で高くなる。
そこで、近年、永久磁石式回転電機の磁石の固定方法の改良に関する技術が種々提案されている。例えば特許文献１記載の技術では、磁石挿入スロット（同文献では永久磁石埋め込み穴と呼称）の両端部を円弧形状とし、さらに、永久磁石を着磁方向のいずれか一方の面に設けた係止部で支持することにより、応力の軽減を図っている。 As described above, in this type of permanent magnet type rotating electrical machine, the stress (σ) generated by the interference (δ) between the shaft 5 and the rotor core 102 is generated in the vicinity of the bridge 6 on the pole center side, and The stress generated from the centrifugal force (F) accompanying the rotation of the child increases mainly in the vicinity of the bridge 6 on the pole center side.
Therefore, in recent years, various techniques relating to improvement of the magnet fixing method of the permanent magnet type rotating electrical machine have been proposed. For example, in the technique described in Patent Document 1, both ends of a magnet insertion slot (referred to as a permanent magnet embedding hole in the same document) have an arc shape, and the permanent magnet is provided on one surface in the magnetizing direction. The stress is reduced by supporting the part.

また、例えば特許文献２記載の技術では、永久磁石と回転子鉄心（同文献では透磁性積層部材と呼称）との隙間を含浸硬化された樹脂材で埋めて永久磁石を固定する構造としている。
また、例えば特許文献３記載の技術では、磁石挿入スロット（同文献では永久磁石埋め込み穴と呼称）の両端部に円弧形状の空隙部を残し、磁石ストッパー部（同文献では永久磁石位置決め用の突起と呼称）の付根をＲ形状に加工することで、磁石ストッパー部の角部の応力軽減を図っている。
また、例えば特許文献４記載の技術では、永久磁石と磁石挿入スロット（同文献では永久磁石挿入孔と呼称）の接触可能な表面積を、内径側よりも外径側に広くする磁石固定構造としている。 For example, in the technique described in Patent Document 2, the permanent magnet is fixed by filling a gap between the permanent magnet and the rotor core (referred to as a magnetically permeable laminated member in the same document) with an impregnated and cured resin material.
Further, for example, in the technique described in Patent Document 3, an arc-shaped gap is left at both ends of a magnet insertion slot (referred to as a permanent magnet embedding hole in the same document), and a magnet stopper portion (in the same document, a protrusion for positioning a permanent magnet). To reduce the stress in the corners of the magnet stopper.
Further, for example, in the technique described in Patent Document 4, a magnet fixing structure in which a surface area that allows contact between a permanent magnet and a magnet insertion slot (referred to as a permanent magnet insertion hole in the same document) is wider on the outer diameter side than on the inner diameter side is employed. .

特許第３７４０３５３号公報Japanese Patent No. 3740353 特開平１１−１９６５５５号公報JP 11-196555 A 特許第４３６３７４６号公報Japanese Patent No. 4363746 特開２００９−２４７１３号公報JP 2009-24713 A

しかしながら、特許文献１記載の技術では、永久磁石を着磁方向のいずれか一方の面に設けた係止部で永久磁石を支持するため、回転子の回転に伴う遠心力により永久磁石が移動しようとするズレ方向と、永久磁石にかける圧力方向とがほぼ直角方向となる。そのため、磁石ストッパー部の係止部の基部に応力が集中するという問題が依然残されている。したがって、永久磁石の保持力を確保する上で未だ改善の余地がある。
また、特許文献２記載の技術では、樹脂材の含浸時および硬化時の温度と永久磁石の減磁温度との問題や、樹脂材の含浸後に着磁を実施するヨークの限界寸法から回転子外径が制約を受けるという問題、あるいは、含浸とヨークなどの設備投資に関する問題等がある。 However, in the technique described in Patent Document 1, since the permanent magnet is supported by a locking portion provided on either surface in the magnetization direction, the permanent magnet will move due to the centrifugal force accompanying the rotation of the rotor. And the direction of pressure applied to the permanent magnet are substantially perpendicular to each other. Therefore, the problem that stress concentrates on the base part of the locking part of the magnet stopper part still remains. Therefore, there is still room for improvement in securing the holding force of the permanent magnet.
Further, in the technique described in Patent Document 2, there is a problem with the temperature of the impregnation and curing of the resin material and the demagnetization temperature of the permanent magnet, and the limit dimension of the yoke that performs magnetization after the impregnation of the resin material. There is a problem that the diameter is restricted, or a problem related to capital investment such as impregnation and yoke.

また、特許文献３記載の技術では、磁石ストッパー部の係止部の角部をＲ形状にすることから、磁石挿入スロット内における磁石ストッパー部が占める横断面積の割合が大きくなる。そのため、磁石挿入スロットに対して永久磁石の幅を有効的に広げることができないという問題がある。したがって、誘起電圧を高めることが困難である。
また、特許文献４記載のような構成によれば、回転子鉄心の締め代に対する応力は軽減されるものの、遠心力や外部荷重が高い場合には、依然として磁石ストッパー部の係止部の角部に応力が集中するという未解決の問題が残される。 Moreover, in the technique of patent document 3, since the corner | angular part of the latching | locking part of a magnet stopper part is made into R shape, the ratio of the cross-sectional area which the magnet stopper part occupies in a magnet insertion slot becomes large. Therefore, there is a problem that the width of the permanent magnet cannot be effectively increased with respect to the magnet insertion slot. Therefore, it is difficult to increase the induced voltage.
Further, according to the configuration described in Patent Document 4, although the stress with respect to the tightening allowance of the rotor core is reduced, when the centrifugal force or the external load is high, the corner portion of the locking portion of the magnet stopper portion still remains. The unresolved problem of stress concentration remains.

そこで、本発明は、このような問題点に着目してなされたものであって、従来形成されていた磁極中央側の磁石係止部（磁石ストッパー部）を無くすことができ、回転子鉄心に発生する応力集中を防止または緩和し得る永久磁石式回転電機を提供することである。
また、本発明は、永久磁石を支持する部分の応力集中を防止または緩和しつつ、永久磁石の保持力の確保が容易な永久磁石式回転電機を提供することである。さらに、永久磁石を支持する部分の応力集中を防止または緩和しつつも、永久磁石の幅を有効的に広げて誘起電圧を高めることができる永久磁石式回転電機を提供することである。 Therefore, the present invention has been made paying attention to such a problem, and can eliminate the conventionally formed magnet locking portion (magnet stopper portion) on the magnetic pole center side, so that the rotor iron core can be removed. It is an object of the present invention to provide a permanent magnet type rotating electrical machine that can prevent or alleviate the stress concentration that occurs.
Another object of the present invention is to provide a permanent magnet type rotating electrical machine that can easily secure a holding force of a permanent magnet while preventing or alleviating stress concentration in a portion that supports the permanent magnet. It is another object of the present invention to provide a permanent magnet type rotating electrical machine capable of increasing the induced voltage by effectively widening the width of the permanent magnet while preventing or alleviating stress concentration in the portion supporting the permanent magnet.

上記課題を解決するために、本発明の一態様に係る永久磁石式回転電機は、励磁コイルを巻装した固定子と、該固定子に対し所定の空隙を隔てて対向配置される回転子とを備える永久磁石式回転電機であって、前記回転子は、自身の回転子鉄心内に軸方向に貫通して形成された複数の磁石挿入スロットと、各磁石挿入スロットそれぞれに対して周方向で隣り合う磁極が異極性となるように挿入された複数の永久磁石とを有し、前記複数の磁石挿入スロットは、周方向で隣り合う他の磁石挿入スロットに対して前記永久磁石の磁極の同極側で相互に分割され、該相互に分割された複数の磁石挿入スロット全体が前記回転子の中心軸に向けて多角形状に配置されており、前記各磁石挿入スロットは、前記複数の永久磁石の磁極の異極側となる磁極中央の位置に各磁石挿入スロット形状を分割する分割部を有するとともに、前記分割部の角の内周形状が、曲面形状とされるとともに、前記分割部と前記永久磁石との間に、バネ弾性を有する磁石保持部材が介装されていることを特徴とする。   In order to solve the above-described problem, a permanent magnet type rotating electrical machine according to an aspect of the present invention includes a stator around which an exciting coil is wound, and a rotor disposed to face the stator with a predetermined gap therebetween. The rotor includes a plurality of magnet insertion slots formed in the rotor iron core so as to penetrate in the axial direction, and a circumferential direction with respect to each of the magnet insertion slots. A plurality of permanent magnets inserted such that adjacent magnetic poles have different polarities, and the plurality of magnet insertion slots are the same as the magnetic poles of the permanent magnets with respect to other magnet insertion slots adjacent in the circumferential direction. The plurality of magnet insertion slots divided into each other on the pole side are arranged in a polygonal shape toward the central axis of the rotor, and each of the magnet insertion slots includes the plurality of permanent magnets. Magnetic pole on the opposite side of the magnetic pole In addition to having a split portion that divides each magnet insertion slot shape at the center position, the inner peripheral shape of the corner of the split portion is a curved surface shape, and spring elasticity is provided between the split portion and the permanent magnet. The magnet holding member which has is interposed, It is characterized by the above-mentioned.

本発明の一態様に係る永久磁石式回転電機によれば、磁極中央側の分割部（ブリッジ）と永久磁石との間にバネ弾性を有する磁石保持部材を介装したので、従来形成されていた磁極中央側の磁石係止部（磁石ストッパー部）を無くし、回転子鉄心に発生する応力集中を防止または緩和することができる。よって、磁石挿入スロット内の永久磁石の飛散や、回転子鉄心の破損の防止またはその抑制が可能となる。   According to the permanent magnet type rotating electrical machine according to one aspect of the present invention, since the magnet holding member having spring elasticity is interposed between the split portion (bridge) on the magnetic pole center side and the permanent magnet, it has been conventionally formed. By eliminating the magnet locking part (magnet stopper part) on the magnetic pole center side, stress concentration occurring in the rotor core can be prevented or alleviated. Therefore, it is possible to prevent or suppress the scattering of the permanent magnets in the magnet insertion slot and the breakage of the rotor core.

また、本発明の一態様に係る永久磁石式回転電機によれば、遠心力により永久磁石が移動しようとする方向が、磁石保持部材によって永久磁石を保持する力の向きと平行となる。そのため、永久磁石を支持する部分の応力集中を防止または緩和しつつ、永久磁石の保持力を確保することが容易となる。さらに、分割部の角の内周形状を曲面形状としたので、応力集中を防止または緩和しつつも、永久磁石の幅を有効的に広げて誘起電圧を高めることができる。   Further, according to the permanent magnet type rotating electrical machine according to one aspect of the present invention, the direction in which the permanent magnet moves due to the centrifugal force is parallel to the direction of the force that holds the permanent magnet by the magnet holding member. Therefore, it becomes easy to ensure the holding force of the permanent magnet while preventing or alleviating stress concentration at the portion supporting the permanent magnet. Further, since the inner peripheral shape of the corners of the divided portions is a curved surface shape, the induced voltage can be increased by effectively widening the width of the permanent magnet while preventing or alleviating stress concentration.

ここで、本発明の一態様に係る永久磁石式回転電機において、前記磁石保持部材が、前記回転子の軸方向に沿って螺旋形状をなしていることは好ましい。このような構成であれば、螺旋の軸方向に磁石保持部材を引っ張ることで、螺旋の径を細くすることが可能であり、また、軸方向に圧縮することで、螺旋の径を太くすることが可能となる。これにより、永久磁石と分割部（ブリッジ）の隙間に容易に磁石保持部材を挿入し、永久磁石を保持することができる。また、特殊な加工を必要としないため、磁石保持部材の製造コストも抑えることができる。   Here, in the permanent magnet type rotating electrical machine according to one aspect of the present invention, it is preferable that the magnet holding member has a spiral shape along the axial direction of the rotor. With such a configuration, it is possible to reduce the diameter of the spiral by pulling the magnet holding member in the axial direction of the spiral, and to increase the diameter of the spiral by compressing in the axial direction. Is possible. Thereby, a magnet holding member can be easily inserted in the clearance gap between a permanent magnet and a division part (bridge), and a permanent magnet can be held. Further, since no special processing is required, the manufacturing cost of the magnet holding member can be reduced.

また、本発明の一態様に係る永久磁石式回転電機において、前記磁石保持部材が、前記回転子の軸方向に沿って連続する波形形状をなしていることは好ましい。このような構成であれば、波の連続する方向に磁石保持部材を引っ張ることで、波の高さ方向の寸法を小さく（波の幅を薄く）することが可能であり、また、波の連続する方向に圧縮することで、波の高さ方向の寸法を大きく（波の幅を厚く）することができる。これにより、永久磁石と分割部（ブリッジ）の隙間に容易に磁石保持部材を挿入して、永久磁石を保持することができる。また、特殊な加工を必要としないため、磁石保持部材の製造コストも抑えることができる。   In the permanent magnet type rotating electrical machine according to one aspect of the present invention, it is preferable that the magnet holding member has a waveform shape continuous along the axial direction of the rotor. With such a configuration, it is possible to reduce the dimension in the wave height direction (thinning the wave width) by pulling the magnet holding member in the wave continuous direction. By compressing in the direction in which the wave is compressed, the dimension in the wave height direction can be increased (the wave width is increased). Thereby, a permanent magnet can be hold | maintained by inserting a magnet holding member easily in the clearance gap between a permanent magnet and a division part (bridge). Further, since no special processing is required, the manufacturing cost of the magnet holding member can be reduced.

また、本発明の一態様に係る永久磁石式回転電機において、前記磁石保持部材が弾性体であり、前記磁石保持部材の横断面が、円、半円、四角形または三角形状であることは好ましい。このような構成であれば、用途に合わせて磁石保持力を適宜調整する上で好適である。
また、本発明の一態様に係る永久磁石式回転電機において、前記磁石保持部材は、素材が平板状の弾性体であり、該平板状の弾性体が軸方向とは直角方向に折り曲げて成形されていることは好ましい。このような構成であれば、軸方向に磁石保持部材を引っ張ることで、横断面積を狭くすることが可能であり、また、軸方向に圧縮することで、横断面積を広くすることが可能となる。さらに、弾性体は柔軟性に優れているため、複雑な隙間にも挿入できるというメリットがある。これにより、永久磁石と分割部（ブリッジ）の隙間に容易に磁石保持部材を挿入し、永久磁石を保持することが可能となる。また、特殊な加工を必要としないため、磁石保持部材の製造コストも抑えることができる。 In the permanent magnet type rotating electrical machine according to one aspect of the present invention, it is preferable that the magnet holding member is an elastic body, and a cross section of the magnet holding member is a circle, a semicircle, a quadrangle, or a triangle. Such a configuration is suitable for appropriately adjusting the magnet holding force according to the application.
Further, in the permanent magnet type rotating electrical machine according to one aspect of the present invention, the magnet holding member is made of a plate-like elastic body, and the plate-like elastic body is bent in a direction perpendicular to the axial direction. It is preferable. With such a configuration, it is possible to narrow the cross-sectional area by pulling the magnet holding member in the axial direction, and it is possible to widen the cross-sectional area by compressing in the axial direction. . Furthermore, since the elastic body is excellent in flexibility, there is an advantage that it can be inserted into a complicated gap. Thereby, it becomes possible to easily insert the magnet holding member into the gap between the permanent magnet and the divided portion (bridge) to hold the permanent magnet. Further, since no special processing is required, the manufacturing cost of the magnet holding member can be reduced.

また、本発明の一態様に係る永久磁石式回転電機において、前記回転子が、前記回転子鉄心に自身軸方向の両端に装着される端板を有し、該端板によって前記磁石保持部材が前記磁石挿入スロット内で自身軸方向が固定されていることは好ましい。このような構成であれば、磁石保持部材の自身軸方向での移動を拘束する構成として好適である。   Moreover, in the permanent magnet type rotating electrical machine according to one aspect of the present invention, the rotor has end plates attached to both ends of the rotor core in the axial direction, and the magnet holding member is provided by the end plates. It is preferable that the axial direction is fixed in the magnet insertion slot. Such a configuration is suitable as a configuration for restraining the movement of the magnet holding member in the axial direction.

上述のように、本発明によれば、従来形成されていた磁極中央側の磁石係止部（磁石ストッパー部）を無くし、回転子鉄心に発生する応力集中を防止または緩和することができる。また、永久磁石を支持する部分の応力集中を防止または緩和しつつ、永久磁石の保持力の確保が容易である。また、応力集中を防止または緩和しつつも、永久磁石の幅を有効的に広げて誘起電圧を高めることができる。   As described above, according to the present invention, the conventionally formed magnet locking portion (magnet stopper portion) on the magnetic pole center side can be eliminated, and stress concentration generated in the rotor core can be prevented or alleviated. In addition, it is easy to ensure the holding force of the permanent magnet while preventing or alleviating stress concentration at the portion supporting the permanent magnet. In addition, the induced voltage can be increased by effectively expanding the width of the permanent magnet while preventing or alleviating stress concentration.

本発明の一態様に係る永久磁石式回転電機の一実施形態を説明する要部の分解斜視図（模式図）である。It is an exploded perspective view (schematic diagram) of the important section explaining one embodiment of the permanent magnet type rotating electrical machine concerning one mode of the present invention. 本発明の一態様に係る永久磁石式回転電機の回転子の要部拡大図であり、同図では回転子の一極分の図を表している（固定子を含む回転電機全体の図示は省略（以下同様）。1 is an enlarged view of a main part of a rotor of a permanent magnet type rotating electrical machine according to an aspect of the present invention, and shows a diagram of one pole of the rotor (illustration of the entire rotating electrical machine including a stator is omitted). (The same applies hereinafter). 本発明に係るおける永久磁石式回転電機の回転子の変形例（第一変形例）を説明する図であり、同図は図２に対応する図を示している。It is a figure explaining the modification (1st modification) of the rotor of the permanent magnet type rotary electric machine which concerns on this invention, The figure has shown the figure corresponding to FIG. 本発明における磁石保持部材の第一変形例（螺旋形状で線材の断面が円形）である。It is a 1st modification (the spiral shape and the cross section of a wire are circular) of the magnet holding member in this invention. 本発明における磁石保持部材の第二変形例（螺旋形状で線材の断面が矩形）である。It is a 2nd modification of the magnet holding member in this invention (The cross section of a wire is rectangular with a helical shape). 本発明における磁石保持部材の第三変形例（波形状）である。It is a 3rd modification (wave shape) of the magnet holding member in this invention. 本発明における磁石保持部材の第四変形例（波形状で貫通孔あり）である。It is a 4th modification (a wave shape and a through-hole) of the magnet holding member in this invention. 本発明における磁石保持部材の横断面形状の変形例（第五変形例(ａ)〜第十三変形例（ｉ））である。It is the modification (5th modification (a)-13th modification (i)) of the cross-sectional shape of the magnet holding member in this invention. 本発明における磁石保持部材の横断面形状の変形例（第十四変形例(ａ)〜第二十二変形例（ｉ））である。It is a modification (14th modification (a)-22nd modification (i)) of the cross-sectional shape of the magnet holding member in this invention. 本発明における磁石保持部材の横断面形状の変形例（第二十三変形例(ａ)〜第二十五変形例(ｃ)）である。It is a modification (23rd modification (a)-25th modification (c)) of the cross-sectional shape of the magnet holding member in this invention. 本発明における磁石保持部材の横断面形状の変形例（第二十六変形例(ａ)〜第二十八変形例(ｃ)）である。It is the modification (26th modification (a)-28th modification (c)) of the cross-sectional shape of the magnet holding member in this invention. 磁石挿入スロットの構造解析結果（遠心力）を示す図（(ａ)従来形状、(ｂ)本発明適用例）である。It is a figure ((a) conventional shape, (b) this invention application example) which shows the structural-analysis result (centrifugal force) of a magnet insertion slot. 磁石挿入スロットの構造解析結果（締め代）を示す図（(ａ)従来形状、(ｂ)本発明適用例）である。It is a figure ((a) conventional shape, (b) this invention application example) which shows the structural analysis result (tightening allowance) of a magnet insertion slot. 磁石挿入スロットの構造解析結果（遠心力＋締め代）を示す図（(ａ)従来形状、(ｂ)本発明適用例）である。It is a figure ((a) conventional shape, (b) this invention application example) which shows the structural-analysis result (centrifugal force + interference allowance) of a magnet insertion slot. 磁石挿入スロットの構造解析結果（（遠心力）、（締め代）、および（遠心力＋締め代））それぞれの最大応力を比較して示す図である。It is a figure which compares and shows the maximum stress of each structure analysis result ((centrifugal force), (tightening allowance), and (centrifugal force + tightening allowance)) of a magnet insertion slot. 従来の回転子の要部拡大図であり、同図では回転子の一極分の図を表している。It is a principal part enlarged view of the conventional rotor, and the figure shows the figure for one pole of a rotor. 図１６において、回転子鉄心に加わる遠心力およびその重心位置を説明する図である。In FIG. 16, it is a figure explaining the centrifugal force added to a rotor iron core, and its gravity center position.

以下、本発明の一実施形態について、図面を適宜参照しつつ説明する。
この埋込磁石形の永久磁石式回転電機は、図１に要部の分解斜視図を示すように、円筒状フレーム２０の内周側に固定子３０が配置され、この固定子３０の内周側に所定の空隙（エアギャップ）を隔てて回転子１が配置される。回転子１はシャフト５に支持されて回転自在になっている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
In this embedded magnet type permanent magnet type rotating electrical machine, as shown in an exploded perspective view of a main part in FIG. 1, a stator 30 is disposed on the inner peripheral side of the cylindrical frame 20. The rotor 1 is arranged on the side with a predetermined air gap (air gap) therebetween. The rotor 1 is supported by a shaft 5 and is rotatable.

回転子１は、図２に要部を拡大図示するように、回転子鉄心２内に形成された磁石挿入スロット３と、この磁石挿入スロット３に装着された永久磁石４とを備えている。そして、この永久磁石４から発生する磁束を、上記固定子３０に備える励磁コイル（不図示）との鎖交磁束量に応じて発生するマグネットトルクと、回転子鉄心２の磁気抵抗（リラクタンス）とを利用して回転子１を回転させるようになっている。なお、励磁コイルの巻き方については大別すると集中巻と分布巻とに分けられる。本発明は、集中巻及び分布巻の両者において効果を発揮するものであり、巻き方を限定するものではない。   The rotor 1 includes a magnet insertion slot 3 formed in the rotor core 2 and a permanent magnet 4 mounted in the magnet insertion slot 3 as shown in an enlarged view of the main part in FIG. And the magnetic torque which generate | occur | produces the magnetic flux which generate | occur | produces from this permanent magnet 4 according to the amount of magnetic flux linkage with the exciting coil (not shown) with which the said stator 30 is provided, and the magnetic resistance (reluctance) of the rotor core 2; Is used to rotate the rotor 1. In addition, about the winding method of an exciting coil, if it divides roughly, it will be divided into concentrated winding and distributed winding. The present invention is effective in both concentrated winding and distributed winding, and does not limit the winding method.

ここで、この回転子１は、回転子鉄心２内にシャフト５の軸方向（図２での紙面の方向）に貫通して形成された複数の磁石挿入スロット３と、磁石挿入スロット３に周方向に隣り合う磁極が異極性となるように一文字に挿入された一対の永久磁石４とを有する。なお、一対の永久磁石４の磁石配置は一文字に限定されず、例えばＶ字配置でもよい。永久磁石４の種類として、たとえばネオジム磁石やフェライト磁石が適用できるが、これらに限定されるものではない。   Here, the rotor 1 includes a plurality of magnet insertion slots 3 formed in the rotor core 2 so as to penetrate in the axial direction of the shaft 5 (the direction of the paper surface in FIG. 2), and the magnet insertion slots 3. It has a pair of permanent magnets 4 inserted in one character so that magnetic poles adjacent in the direction have different polarities. In addition, the magnet arrangement | positioning of a pair of permanent magnet 4 is not limited to one character, For example, a V-shaped arrangement | positioning may be sufficient. As a kind of permanent magnet 4, for example, a neodymium magnet or a ferrite magnet can be applied, but is not limited thereto.

複数の磁石挿入スロット３は、周方向で隣り合う他の磁石挿入スロット３に対して永久磁石４の磁極の同極側で相互に分割され、該相互に分割された複数の磁石挿入スロット３全体が回転子１の中心軸となるシャフト５に向けて多角形状（本実施形態は、図１に示すように、六角形状とされた６極機の例）に配置されている。なお、本実施形態は６極機の例であるが、これに限定するものではない。   The plurality of magnet insertion slots 3 are divided from each other on the same pole side of the magnetic pole of the permanent magnet 4 with respect to other magnet insertion slots 3 adjacent in the circumferential direction, and the plurality of magnet insertion slots 3 divided as a whole are divided. Are arranged in a polygonal shape (this embodiment is an example of a hexapole machine having a hexagonal shape as shown in FIG. 1) toward the shaft 5 serving as the central axis of the rotor 1. In addition, although this embodiment is an example of a 6 pole machine, it is not limited to this.

各磁石挿入スロット３は、前記一対の永久磁石４の磁極の異極側となる磁極中央の位置に各磁石挿入スロット形状を左右に二分割する分割部であるブリッジ６を有する。なお、本実施形態は、同極内の磁石挿入スロット３が中央のブリッジ６で左右に二分割されている例を示すが、これに限定するものではない。そして、磁石挿入スロット３の磁極中央側のブリッジ６の内周６ｎを曲面形状（この例では略円弧状）とし、前記磁石挿入スロット３の磁極中央側のブリッジ６と永久磁石４の間にバネ弾性を有する磁石保持部材７が介装されている。なお、この例の磁石保持部材７の横断面の形状は、上記内周６ｎの曲面形状に倣う形状とされている。   Each magnet insertion slot 3 has a bridge 6 that is a divided portion that divides the shape of each magnet insertion slot into left and right parts at the position of the center of the magnetic pole on the side opposite to the magnetic pole of the pair of permanent magnets 4. In addition, although this embodiment shows the example in which the magnet insertion slot 3 in the same pole is divided into right and left by the central bridge 6, it is not limited to this. Then, the inner periphery 6n of the bridge 6 on the magnetic pole center side of the magnet insertion slot 3 is formed into a curved surface shape (substantially arcuate in this example), and a spring is interposed between the bridge 6 on the magnetic pole center side of the magnet insertion slot 3 and the permanent magnet 4. An elastic magnet holding member 7 is interposed. In addition, the shape of the cross section of the magnet holding member 7 of this example is a shape that follows the curved shape of the inner periphery 6n.

そして、磁極外周側（中央側とは反対側）には、永久磁石４の外側の端面に係合可能な段部を有する磁石ストッパー部９が形成されている。磁石ストッパー部９の段部の端面は、永久磁石４の外側の端面に対向する位置まで張り出している。これにより、介装された磁石保持部材７のバネ弾性で押圧された永久磁石４が磁石ストッパー部９の段部に突き当てられることで永久磁石４が保持されるようになっている。なお、本実施形態の例では、磁石ストッパー部９が、磁石挿入スロット３の径方向での内径側の角にのみ形成された例である。   A magnet stopper portion 9 having a step portion that can be engaged with the outer end face of the permanent magnet 4 is formed on the outer peripheral side of the magnetic pole (the side opposite to the center side). The end surface of the stepped portion of the magnet stopper portion 9 protrudes to a position facing the outer end surface of the permanent magnet 4. Thus, the permanent magnet 4 is held by the permanent magnet 4 pressed by the spring elasticity of the interposed magnet holding member 7 being abutted against the stepped portion of the magnet stopper portion 9. In the example of the present embodiment, the magnet stopper portion 9 is formed only at the corner on the inner diameter side in the radial direction of the magnet insertion slot 3.

ここで、回転子１は、図１に示すように、回転子鉄心２の軸方向両端にそれぞれ固定される円環状の端板１０を有する。各端板１０は、磁石保持部材７の端部を支持し、磁石保持部材７の取り付け位置を固定する構造を有する。本実施形態の例では、磁石保持部材７の端部を挿入可能に形成された有底の丸溝穴１０ａが、磁石保持部材７の端部に対向するように周方向に等配されている。そして、軸方向の両端に付設された二枚の端板１０により、磁石保持部材７をその軸方向両側から圧縮することで、磁石保持部材７の軸方向の位置が保持され、これにより、磁石保持部材７の磁石挿入スロット３内での軸方向の移動が拘束される。なお、図１では、各端板１０に形成された磁石保持部材７の取り付け構造を有底の丸溝穴１０ａとした例を示したが、これに限定するものではない。また、図１では、１つの磁石挿入スロット３の各永久磁石４当たりに１つの磁石保持部材７を取り付けている例を示しているが、磁石挿入スロット３や永久磁石４当たりの磁石保持部材７の対応する個数についてもこれに限定するものではない。   Here, as shown in FIG. 1, the rotor 1 has annular end plates 10 that are respectively fixed to both axial ends of the rotor core 2. Each end plate 10 has a structure that supports the end of the magnet holding member 7 and fixes the mounting position of the magnet holding member 7. In the example of the present embodiment, the bottomed round slot 10 a formed so that the end of the magnet holding member 7 can be inserted is equally arranged in the circumferential direction so as to face the end of the magnet holding member 7. . And the position of the axial direction of the magnet holding member 7 is hold | maintained by compressing the magnet holding member 7 from the axial direction both sides by the two end plates 10 attached to the both ends of the axial direction. The movement of the holding member 7 in the axial direction within the magnet insertion slot 3 is restricted. In addition, although the example which made the attachment structure of the magnet holding member 7 formed in each end plate 10 the round slot 10a with a bottom was shown in FIG. 1, it is not limited to this. 1 shows an example in which one magnet holding member 7 is attached to each permanent magnet 4 in one magnet insertion slot 3, but the magnet holding member 7 per magnet insertion slot 3 or permanent magnet 4 is shown. The corresponding number of is not limited to this.

次に、上記の永久磁石式回転電機の作用効果について説明する。
上述したように、この永久磁石式回転電機によれば、磁極中央側の分割部であるブリッジ６と永久磁石４との間にバネ弾性を有する磁石保持部材７を介装したので、従来形成されていた磁極中央側の磁石係止部（磁石ストッパー部（図１６参照））を無くすことで、回転子鉄心２に発生する応力集中を防止または緩和することができる。よって、磁石挿入スロット３内の永久磁石４の飛散や、回転子鉄心２の破損の防止またはその抑制が可能となる。 Next, the effect of the permanent magnet type rotating electrical machine will be described.
As described above, according to this permanent magnet type rotating electrical machine, since the magnet holding member 7 having spring elasticity is interposed between the bridge 6 and the permanent magnet 4 which are the divided portions on the magnetic pole center side, it is conventionally formed. By eliminating the magnet locking portion (magnet stopper portion (see FIG. 16)) on the center side of the magnetic pole, stress concentration generated in the rotor core 2 can be prevented or alleviated. Therefore, scattering of the permanent magnet 4 in the magnet insertion slot 3 and damage to the rotor core 2 can be prevented or suppressed.

また、この永久磁石式回転電機によれば、遠心力により永久磁石４が移動しようとする方向（図２の矢印参照）が、磁石保持部材７によって永久磁石４を押圧して保持する力の向きと平行となる。そのため、永久磁石４を支持する部分での応力集中を防止または抑制しつつ、永久磁石４の保持力を確保することが容易となる。さらに、ブリッジ６の角の内周６ａを曲面形状としたので、その部分での応力集中を防止または緩和しつつ、永久磁石４の幅を有効的に広げて誘起電圧を高めることができる。つまり、従来の構成である図１６と、本実施形態の図２とを比較するとわかるように、本実施形態の永久磁石式回転電機によれば、応力の緩和を行うＲ加工を施した磁石ストッパー部９ａ（図１６参照）を形成すること無く永久磁石４の保持が可能なので、磁石幅を十分に広げる自由度が多くなり、誘起電圧を高めることができるという効果がある。   In addition, according to this permanent magnet type rotating electrical machine, the direction in which the permanent magnet 4 tries to move due to centrifugal force (see the arrow in FIG. 2) is the direction of the force that presses and holds the permanent magnet 4 by the magnet holding member 7. It becomes parallel with. Therefore, it becomes easy to ensure the holding force of the permanent magnet 4 while preventing or suppressing the stress concentration at the portion supporting the permanent magnet 4. Furthermore, since the inner periphery 6a of the corner of the bridge 6 is curved, the induced voltage can be increased by effectively expanding the width of the permanent magnet 4 while preventing or alleviating stress concentration at that portion. That is, as can be seen from a comparison between FIG. 16 showing the conventional configuration and FIG. 2 of the present embodiment, according to the permanent magnet type rotating electric machine of the present embodiment, the magnet stopper subjected to the R machining for relaxing the stress. Since the permanent magnet 4 can be held without forming the portion 9a (see FIG. 16), the degree of freedom for sufficiently widening the magnet width is increased and the induced voltage can be increased.

なお、本発明に係る永久磁石式回転電機は、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しなければ種々の変形が可能であることは勿論である。
例えば、上記実施形態では、磁石ストッパー部９が、磁石挿入スロット３の径方向での内径側（図２での磁石挿入スロット３の下側）の角に形成された例で説明したが、これに限らず、例えば図３に変形例を示すように、磁石ストッパー部９を、磁石挿入スロット３の径方向での外径側（図３での磁石挿入スロット３の上側）の角に形成してもよい。なお、図３と図２とは、磁石ストッパー部９の位置のみ異なる。 The permanent magnet type rotating electrical machine according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the magnet stopper portion 9 has been described as an example formed at the corner on the inner diameter side in the radial direction of the magnet insertion slot 3 (below the magnet insertion slot 3 in FIG. 2). For example, as shown in a modification in FIG. 3, the magnet stopper portion 9 is formed at a corner on the outer diameter side (upper side of the magnet insertion slot 3 in FIG. 3) in the radial direction of the magnet insertion slot 3. May be. 3 and FIG. 2 differ only in the position of the magnet stopper portion 9.

また、例えば上記実施形態では、磁極中央側のブリッジ６と永久磁石４の間にバネ弾性を有する磁石保持部材７が介装されている例で説明したが、磁石保持部材７の構成（例えばその形状や磁石挿入スロット３への挿入方法）についても種々の形態を採用することができる。
例えば図４および図５に磁石保持部材７の形状の変形例を示す。
図４、５に示す例は、磁石保持部材７が、回転子１の軸方向に沿って螺旋形状をなしている例であり、図４は磁石保持部材７を形成する素材の横断面が円形状、図５は素材の横断面が長方形状の例である。図４、５に示した螺旋形状の磁石保持部材７は、素材として、例えばピアノ線、バネ鋼、ステンレス材、真鍮材、銅材などの延性金属材料で形成することができる。 Further, for example, in the above-described embodiment, the magnet holding member 7 having spring elasticity is interposed between the bridge 6 on the magnetic pole center side and the permanent magnet 4, but the configuration of the magnet holding member 7 (for example, its Various forms can also be adopted for the shape and the method of insertion into the magnet insertion slot 3).
For example, FIGS. 4 and 5 show modified examples of the shape of the magnet holding member 7.
The examples shown in FIGS. 4 and 5 are examples in which the magnet holding member 7 has a spiral shape along the axial direction of the rotor 1, and FIG. 4 shows a circular cross section of the material forming the magnet holding member 7. FIG. 5 shows an example in which the cross section of the material is rectangular. The helical magnet holding member 7 shown in FIGS. 4 and 5 can be formed of a ductile metal material such as piano wire, spring steel, stainless steel, brass, or copper as a material.

このような構成であれば、磁石保持部材７が回転子１の軸方向に沿って螺旋形状であるため、螺旋の軸方向に磁石保持部材７を引っ張ることで、螺旋の径を細くすることが可能であり、また、軸方向に圧縮することで、螺旋の径を太くすることが可能となる。これにより、永久磁石４とブリッジ６ａの隙間に容易に磁石保持部材７を挿入し、永久磁石４を保持することができる。また、特殊な加工を必要としないため、磁石保持部材７の製造コストも抑えることができる。なお、磁石保持部材７の形状がこれら変形例に限定されるものではない。また、螺旋形状のピッチについても、用途に合わせて磁石保持力を調整する必要があるため、限定されるものではない。   With such a configuration, since the magnet holding member 7 has a spiral shape along the axial direction of the rotor 1, the diameter of the spiral can be reduced by pulling the magnet holding member 7 in the axial direction of the spiral. It is possible to increase the helical diameter by compressing in the axial direction. Thereby, the magnet holding member 7 can be easily inserted into the gap between the permanent magnet 4 and the bridge 6a, and the permanent magnet 4 can be held. Further, since no special processing is required, the manufacturing cost of the magnet holding member 7 can be suppressed. The shape of the magnet holding member 7 is not limited to these modified examples. Also, the helical pitch is not limited because it is necessary to adjust the magnet holding force in accordance with the application.

さらに、図６、７に、磁石保持部材７を回転子１の軸方向に沿って連続する波形形状とした例を示す。図６、７に示す例では、波形形状の断面は長方形をなしている。また、図７に示すように、波形形状の連続する方向に沿って所定の間隔で複数の貫通孔を空けることにより、永久磁石４の保持力を用途に合わせて調整することも可能である。なお、図７の例では、波形形状の幅方向についても複数（この例では二つ）の貫通孔を設けた例である。図６、７で示した波形形状は、素材として、例えばバネ鋼やステンレス材、あるいは真鍮材や銅材などの延性金属材料の平板の折り曲げ加工で形成することができる。なお、図６、７に示す波形形状の断面は長方形の例であるが、これに限定されるものではない。波のピッチについても、用途に合わせて磁石保持力を調整する必要があるため限定するものではない。また、波の形状も種々変形可能である。   Further, FIGS. 6 and 7 show examples in which the magnet holding member 7 has a waveform shape continuous along the axial direction of the rotor 1. In the examples shown in FIGS. 6 and 7, the corrugated cross section is rectangular. Moreover, as shown in FIG. 7, it is also possible to adjust the holding force of the permanent magnet 4 according to the application by opening a plurality of through holes at predetermined intervals along the direction in which the waveform shape continues. 7 is an example in which a plurality of (two in this example) through-holes are provided also in the width direction of the waveform shape. The corrugated shape shown in FIGS. 6 and 7 can be formed by bending a flat plate of a ductile metal material such as spring steel, stainless steel, brass material, or copper material as a material. 6 and 7 are rectangular examples, but the present invention is not limited to this. The wave pitch is not limited because it is necessary to adjust the magnet holding force in accordance with the application. Also, the wave shape can be variously modified.

このような構成であれば、磁石保持部材７が波形形状であるため、波の連続する方向に磁石保持部材７を引っ張ることで、波の高さ方向の寸法を小さく（波の幅を薄く）することが可能であり、また、波の連続する方向に圧縮することで、波の高さ方向の寸法を大きく（波の幅を厚く）することができる。これにより、永久磁石４とブリッジ６ａの隙間に容易に磁石保持部材７を挿入して、永久磁石４を保持することができる。また、特殊な加工を必要としないため、磁石保持部材７の製造コストも抑えることができる。   With such a configuration, since the magnet holding member 7 has a wave shape, by pulling the magnet holding member 7 in the wave continuation direction, the dimension in the wave height direction is reduced (the wave width is reduced). In addition, by compressing in the wave continuation direction, the dimension in the wave height direction can be increased (the wave width is increased). Accordingly, the permanent magnet 4 can be held by easily inserting the magnet holding member 7 into the gap between the permanent magnet 4 and the bridge 6a. Further, since no special processing is required, the manufacturing cost of the magnet holding member 7 can be suppressed.

さらにまた、図８に磁石保持部材７の横断面の形状を円形状（中実、中空）、楕円形状ないし長円形状（中実、中空）及び半円形状やＵ字形状等とした種々の変形例を示す。また、図９に磁石保持部材７の横断面の形状を四角形状（中実、中空）とした種々の例（長方形、台形、ひし形等）を示す。さらに、図１０に、磁石保持部材７の横断面の形状を三角形状やアングル形とした種々の例、図１１に素材が平板であり、その平板を板の厚み方向に折り曲げて成形した磁石保持部材７の形状の例を示す。このように、種々の横断面形状を磁石保持部材７に採用すれば、用途に合わせて磁石保持力を適宜調整する上で好適である。   Furthermore, FIG. 8 shows various shapes in which the cross-sectional shape of the magnet holding member 7 is circular (solid, hollow), elliptical or oval (solid, hollow), semicircular, U-shaped, etc. A modification is shown. FIG. 9 shows various examples (rectangle, trapezoid, rhombus, etc.) in which the cross-sectional shape of the magnet holding member 7 is a quadrilateral (solid, hollow). Further, FIG. 10 shows various examples in which the cross-sectional shape of the magnet holding member 7 is triangular or angled, and FIG. 11 shows that the material is a flat plate, and the magnet holding is formed by bending the flat plate in the thickness direction of the plate. The example of the shape of the member 7 is shown. Thus, if various cross-sectional shapes are adopted for the magnet holding member 7, it is preferable to appropriately adjust the magnet holding force according to the application.

ここで、図８〜１１で示した種々の磁石保持部材７は、例えば耐熱性に優れた弾性体であるゴム材などで製作することができる。このような構成であれば、磁石保持部材７がゴム材なので、軸方向に磁石保持部材７を引っ張ることで、横断面積を狭くすることが可能であり、また、軸方向に圧縮することで、横断面積を広くすることが可能となる。さらに、ゴム材は柔軟性に優れているため、複雑な隙間にも挿入できるというメリットがある。これにより、永久磁石４とブリッジ６ａの隙間に容易に磁石保持部材７を挿入し、永久磁石４を保持することが可能となる。また、特殊な加工を必要としないため、磁石保持部材７の製造コストも抑えることができる。   Here, the various magnet holding members 7 shown in FIGS. 8 to 11 can be made of, for example, a rubber material which is an elastic body excellent in heat resistance. With such a configuration, since the magnet holding member 7 is a rubber material, it is possible to narrow the cross-sectional area by pulling the magnet holding member 7 in the axial direction, and by compressing in the axial direction, The cross-sectional area can be increased. Further, since the rubber material is excellent in flexibility, there is an advantage that it can be inserted into a complicated gap. As a result, the magnet holding member 7 can be easily inserted into the gap between the permanent magnet 4 and the bridge 6 a to hold the permanent magnet 4. Further, since no special processing is required, the manufacturing cost of the magnet holding member 7 can be suppressed.

本発明の効果を確認するために、磁石挿入スロットの構造解析を行った。その結果を図１２〜１５に示す。
本発明によれば、永久磁石と中央の分割部（ブリッジ）の隙間に磁石保持部材を挿入して永久磁石を保持する構成としているので、従来形成されていた磁極中央側の磁石係止部（磁石ストッパー部）を無くすことを可能とした。これにより、図１２〜１５に示す解析結果からもわかるように、回転子鉄心に発生する応力集中を緩和することができることが確認された。 In order to confirm the effect of the present invention, a structural analysis of the magnet insertion slot was performed. The results are shown in FIGS.
According to the present invention, since the permanent magnet is held by inserting the magnet holding member into the gap between the permanent magnet and the central divided portion (bridge), the conventionally formed magnet locking portion ( The magnet stopper part) can be eliminated. Thus, as can be seen from the analysis results shown in FIGS. 12 to 15, it was confirmed that the stress concentration generated in the rotor core can be relaxed.

１ 回転子
２ 回転子鉄心
２ａ 遠心力がブリッジに作用するおよその範囲
３ 磁石挿入スロット
４ 永久磁石
５ シャフト
６、６ａ 極中央側のブリッジ（分割部）
６ｂ 外周側のブリッジ
７ 磁石保持部材
Ｇ ブリッジに加わる遠心力の重心位置
１０９ａ 極中央側の磁石ストッパー部（従来の構成）
９、９ｂ 外周側の磁石ストッパー部
１０ 端板
１０ａ 磁石保持部材の固定溝
２０ フレーム
２１ 固定子鉄心
３０ 固定子 DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor core 2a Approximate range in which centrifugal force acts on a bridge 3 Magnet insertion slot 4 Permanent magnet 5 Shaft 6, 6a The pole center side bridge (dividing part)
6b Bridge on the outer peripheral side 7 Magnet holding member G Center of gravity position 109a of centrifugal force applied to the bridge Magnet stopper portion on the pole center side (conventional configuration)
9, 9b Magnet stopper portion 10 on the outer peripheral side End plate 10a Fixing groove 20 of magnet holding member Frame 21 Stator core 30 Stator

Claims (6)

励磁コイルを巻装した固定子と、該固定子に対し所定の空隙を隔てて対向配置される回転子とを備える永久磁石式回転電機であって、
前記回転子は、自身の回転子鉄心内に軸方向に貫通して形成された複数の磁石挿入スロットと、各磁石挿入スロットそれぞれに対して周方向で隣り合う磁極が異極性となるように挿入された複数の永久磁石とを有し、
前記複数の磁石挿入スロットは、周方向で隣り合う他の磁石挿入スロットに対して前記永久磁石の磁極の同極側で相互に分割され、該相互に分割された複数の磁石挿入スロット全体が前記回転子の中心軸に向けて多角形状に配置されており、
前記各磁石挿入スロットは、前記複数の永久磁石の磁極の異極側となる磁極中央の位置に各磁石挿入スロット形状を分割する分割部を有するとともに、前記分割部の角の内周形状が、曲面形状とされるとともに、前記分割部と前記永久磁石との間に、バネ弾性を有する磁石保持部材が介装されていることを特徴とする永久磁石式回転電機。 A permanent magnet type rotating electrical machine comprising a stator around which an exciting coil is wound, and a rotor arranged to face the stator with a predetermined gap therebetween,
The rotor is inserted such that a plurality of magnet insertion slots formed in the rotor core in the axial direction penetrate through the rotor core and magnetic poles adjacent to each other in the circumferential direction have different polarities. A plurality of permanent magnets,
The plurality of magnet insertion slots are divided from each other on the same pole side of the magnetic pole of the permanent magnet with respect to other magnet insertion slots adjacent in the circumferential direction, and the plurality of magnet insertion slots divided into each other are It is arranged in a polygonal shape toward the center axis of the rotor,
Each of the magnet insertion slots has a division part that divides each magnet insertion slot shape at a position in the center of the magnetic pole on the side opposite to the magnetic pole of the plurality of permanent magnets, and the inner peripheral shape of the corner of the division part is A permanent magnet type rotating electrical machine having a curved surface shape, and a magnet holding member having spring elasticity interposed between the divided portion and the permanent magnet. 前記磁石保持部材は、前記回転子の軸方向に沿って螺旋形状をなしていることを特徴とする請求項１に記載の永久磁石式回転電機。   The permanent magnet type rotating electric machine according to claim 1, wherein the magnet holding member has a spiral shape along an axial direction of the rotor. 前記磁石保持部材は、前記回転子の軸方向に沿って連続する波形形状をなしていることを特徴とする請求項１に記載の永久磁石式回転電機。   The permanent magnet type rotating electrical machine according to claim 1, wherein the magnet holding member has a waveform shape continuous along an axial direction of the rotor. 前記磁石保持部材が弾性体であり、前記磁石保持部材の横断面が、円、半円、四角形または三角形状であることを特徴とする請求項１に記載の永久磁石式回転電機。   The permanent magnet type rotating electrical machine according to claim 1, wherein the magnet holding member is an elastic body, and a cross section of the magnet holding member is a circle, a semicircle, a quadrangle, or a triangle. 前記磁石保持部材は、素材が平板状の弾性体であり、該平板状の弾性体が軸方向とは直角方向に折り曲げて成形されていることを特徴とする請求項１に記載の永久磁石式回転電機。   2. The permanent magnet type according to claim 1, wherein the magnet holding member is a flat plate-like elastic body, and the flat plate-like elastic body is formed by being bent in a direction perpendicular to the axial direction. Rotating electric machine. 前記回転子は、前記回転子鉄心に自身軸方向の両端に装着される端板を有し、該端板によって前記磁石保持部材が前記磁石挿入スロット内で自身軸方向が固定されていることを特徴とする請求項１〜５のいずれか一項に記載の永久磁石式回転電機。   The rotor has end plates attached to both ends in the axial direction of the rotor iron core, and the end plate holds the magnet holding member in the axial direction in the magnet insertion slot. The permanent magnet type rotating electrical machine according to any one of claims 1 to 5, wherein
JP2012136832A 2012-06-18 2012-06-18 Permanent magnet type rotary electrical machine Pending JP2014003785A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015139255A (en) * 2014-01-21 2015-07-30 トヨタ自動車株式会社 rotor
WO2016177970A1 (en) * 2015-05-07 2016-11-10 Valeo Equipements Electriques Moteur Improved rotor for a rotating electrical machine, comprising at least one magnet clamping element
WO2021176823A1 (en) * 2020-03-04 2021-09-10 日立Astemo株式会社 Rotary electric machine and rotor thereof
CN117254639A (en) * 2023-11-20 2023-12-19 张家港华捷电子有限公司 Water-cooling type brushless inner rotor water pump motor and water pump

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Publication number Priority date Publication date Assignee Title
JP2003092846A (en) * 2001-09-19 2003-03-28 Toyoda Mach Works Ltd Embedded magnet motor
JP2009247131A (en) * 2008-03-31 2009-10-22 Fuji Electric Systems Co Ltd Rotor of permanent magnet motor
JP2012029343A (en) * 2010-07-20 2012-02-09 Daikin Ind Ltd Permanent magnet rotor and method of producing the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003092846A (en) * 2001-09-19 2003-03-28 Toyoda Mach Works Ltd Embedded magnet motor
JP2009247131A (en) * 2008-03-31 2009-10-22 Fuji Electric Systems Co Ltd Rotor of permanent magnet motor
JP2012029343A (en) * 2010-07-20 2012-02-09 Daikin Ind Ltd Permanent magnet rotor and method of producing the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015139255A (en) * 2014-01-21 2015-07-30 トヨタ自動車株式会社 rotor
WO2016177970A1 (en) * 2015-05-07 2016-11-10 Valeo Equipements Electriques Moteur Improved rotor for a rotating electrical machine, comprising at least one magnet clamping element
WO2021176823A1 (en) * 2020-03-04 2021-09-10 日立Astemo株式会社 Rotary electric machine and rotor thereof
CN117254639A (en) * 2023-11-20 2023-12-19 张家港华捷电子有限公司 Water-cooling type brushless inner rotor water pump motor and water pump
CN117254639B (en) * 2023-11-20 2024-02-13 张家港华捷电子有限公司 Water-cooling type brushless inner rotor water pump motor and water pump

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