JP2011199947A - Permanent magnet embedded rotor for rotary electric machine, and rotary electric machine - Google Patents

Permanent magnet embedded rotor for rotary electric machine, and rotary electric machine Download PDF

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JP2011199947A
JP2011199947A JP2010061082A JP2010061082A JP2011199947A JP 2011199947 A JP2011199947 A JP 2011199947A JP 2010061082 A JP2010061082 A JP 2010061082A JP 2010061082 A JP2010061082 A JP 2010061082A JP 2011199947 A JP2011199947 A JP 2011199947A
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permanent magnet
magnetic pole
slits
rotor
rotor core
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Yoichi Saito
洋一 斉藤
Toshihiko Yoshida
稔彦 吉田
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Toyota Industries Corp
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Toyota Industries Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet embedded rotor capable of improving demagnetization resistance by suppressing magnetic saturation in the proximity of a magnetic pole of a permanent magnet.SOLUTION: Gaps 20A, 20B continue to permanent magnet housings 19A, 19B for housing permanent magnets 17A, 17B, respectively. A plurality of slits 21A, 22A, 23A are disposed in parallel between a magnetic pole surface 170A near to a magnetic pole end 172A and an outer circumferential surface 162 of a rotor core 16. A plurality of slits 21B, 22B, 23B are disposed in parallel between a magnetic pole surface 170B near to a magnetic pole end 172B and the outer circumferential surface 162 of the rotor core 16. The slits 23A, 23B are longer than the slits 22A, 22B, respectively, and the slits 22A, 22B are longer than the slits 21A, 21B, respectively.

Description

本発明は、回転電機の永久磁石埋設型回転子及び回転電機に関する。   The present invention relates to a permanent magnet embedded rotor of a rotating electrical machine and a rotating electrical machine.

回転子のロータコアに埋設された複数の永久磁石によって複数の磁極を構成する永久磁石埋設型回転子では、隣り合う磁極が互いに異なっている。そのため、隣り合う磁極を構成する隣り合う永久磁石の磁石端部間で磁束の短絡が生じやすい。短絡磁束が多くなると、トルクが低下する。   In a permanent magnet embedded rotor in which a plurality of magnetic poles are constituted by a plurality of permanent magnets embedded in the rotor core of the rotor, adjacent magnetic poles are different from each other. Therefore, a short circuit of the magnetic flux is likely to occur between the magnet end portions of the adjacent permanent magnets constituting the adjacent magnetic poles. As the short-circuit magnetic flux increases, the torque decreases.

特許文献１に開示の回転子では、永久磁石の磁石端部に接すると共に、ロータコアの外周面に近接する位置まで延びるフラックスバリア（空隙）がロータコアに設けられている。フラックスバリアは、フラックスバリアとロータコアの外周面との間の部位（ブリッジ部）の幅を狭めるため、隣り合う永久磁石の磁石端部間での磁束の短絡が抑制されて短絡磁束が低減される。   In the rotor disclosed in Patent Document 1, the rotor core is provided with a flux barrier (air gap) that contacts the magnet end of the permanent magnet and extends to a position close to the outer peripheral surface of the rotor core. Since the flux barrier narrows the width of the portion (bridge portion) between the flux barrier and the outer peripheral surface of the rotor core, short-circuiting of the magnetic flux between the magnet end portions of adjacent permanent magnets is suppressed, and the short-circuit magnetic flux is reduced. .

特開２００８−２１１９３４号公報JP 2008-211194 A

しかし、磁極中央部付近から出る磁束が回転子の回転方向側のブリッジ部に向かうため、回転子の回転方向側の磁極端部付近での磁気飽和が生じ易い。このような磁気飽和は、磁石端部におけるパーミアンス係数を低下させて磁石端部の減磁耐量を低下させる。   However, since the magnetic flux emitted from the vicinity of the magnetic pole central portion is directed to the bridge portion on the rotation direction side of the rotor, magnetic saturation is likely to occur near the magnetic pole end portion on the rotation direction side of the rotor. Such magnetic saturation reduces the permeance coefficient at the end of the magnet and reduces the demagnetization tolerance at the end of the magnet.

本発明は、永久磁石の磁極端部付近での磁気飽和を抑制して減磁耐量を向上できる永久磁石埋設型回転子を提供することを目的とする。   An object of the present invention is to provide a permanent magnet embedded type rotor capable of improving the demagnetization resistance by suppressing magnetic saturation in the vicinity of the magnetic pole end of the permanent magnet.

請求項１乃至請求項５の発明は、ロータコアに形成された収容孔に永久磁石が収容されている回転電機の永久磁石埋設型回転子を対象とし、請求項１の発明では、前記収容孔は、少なくとも、前記永久磁石が収容可能な永久磁石収容部及び前記永久磁石収容部のｑ軸側の空隙からなり、前記収容孔と前記ロータコアの外周面との間を始端として前記収容孔に向かう複数のスリットが前記ロータコアに形成されており、前記スリットは、前記永久磁石の磁極面と向き合う前記収容孔の磁極側対向面に沿って前記永久磁石収容部から前記空隙に向かう方向に間隔をおいて配置されており、前記スリットの長さは、前記空隙寄りになるにつれて長くなり、前記スリットの始端は、前記空隙寄りになるにつれて前記磁極側対向面から遠くにある。   The inventions of claims 1 to 5 are directed to a permanent magnet embedded rotor of a rotating electrical machine in which a permanent magnet is accommodated in an accommodation hole formed in a rotor core. In the invention of claim 1, the accommodation hole is A plurality of at least one permanent magnet accommodating portion capable of accommodating the permanent magnet and a gap on the q-axis side of the permanent magnet accommodating portion, and starting from the space between the accommodation hole and the outer peripheral surface of the rotor core. Are formed in the rotor core, and the slits are spaced in a direction from the permanent magnet housing portion toward the gap along the magnetic pole side facing surface of the housing hole facing the magnetic pole surface of the permanent magnet. The length of the slit becomes longer as it approaches the gap, and the starting end of the slit becomes farther from the magnetic pole side facing surface as it approaches the gap.

このような複数のスリットは、磁極面の中央側から出る磁束が空隙とロータコアの外周面との間の部位に向かうのを抑制する。そのため、永久磁石の磁極端部付近での磁気飽和が抑制されて減磁耐量が向上する。   Such a plurality of slits prevents the magnetic flux from the center side of the magnetic pole surface from going to a portion between the air gap and the outer peripheral surface of the rotor core. Therefore, magnetic saturation near the magnetic pole end of the permanent magnet is suppressed, and the demagnetization resistance is improved.

好適な例では、前記スリットは、互いに平行に形成されている。
複数のスリットを平行とする構成は、スリット付きロータコアを形成するための型の形成を容易にする。 In a preferred example, the slits are formed in parallel to each other.
The configuration in which the plurality of slits are parallel facilitates the formation of a mold for forming the rotor core with slits.

好適な例では、前記スリットは、前記磁極側対向面に対して垂直に形成されている。
好適な例では、前記スリットは、前記収容孔から離れた位置に形成されている。
収容孔内の永久磁石と収容孔の形成面との間に樹脂を充填して永久磁石を固定する場合、樹脂がスリット内へ流入することはなく、永久磁石と収容孔の形成面との間の樹脂充填が良好に行なわれる。 In a preferred example, the slit is formed perpendicular to the magnetic pole side facing surface.
In a preferred example, the slit is formed at a position away from the accommodation hole.
When a permanent magnet is fixed by filling a resin between the permanent magnet in the accommodation hole and the formation surface of the accommodation hole, the resin does not flow into the slit, and between the permanent magnet and the formation surface of the accommodation hole. The resin is filled well.

好適な例では、前記複数のスリットと前記収容孔とが繋がっている。
磁極面の中央側から出る磁束が空隙とロータコアの外周面との間の部位に向かうのを抑制する効果が高くなる。 In a preferred example, the plurality of slits and the accommodation hole are connected.
The effect of suppressing the magnetic flux from the center side of the magnetic pole surface from going to the portion between the air gap and the outer peripheral surface of the rotor core is enhanced.

請求項６の発明は、ロータコアに形成された収容孔に永久磁石が収容されている永久磁石埋設型回転子を備えた回転電機を対象とし、前記永久磁石埋設型回転子は、請求項１乃至請求項５のいずれか１項に記載の永久磁石埋設型回転子である。   The invention of claim 6 is directed to a rotating electrical machine including a permanent magnet embedded rotor in which a permanent magnet is accommodated in an accommodation hole formed in a rotor core, and the permanent magnet embedded rotor is defined in claims 1 to 1. The permanent magnet embedded rotor according to claim 5.

本発明の永久磁石埋設型回転子は、永久磁石の磁極端部付近での磁気飽和を抑制して減磁耐量を向上できるという優れた効果を奏する。   The permanent magnet embedded rotor according to the present invention has an excellent effect that the demagnetization resistance can be improved by suppressing magnetic saturation in the vicinity of the magnetic pole end of the permanent magnet.

一実施形態を示し、（ａ）は、回転電機の断面図。（ｂ）は、回転電機の側断面図。One embodiment is shown and (a) is a sectional view of a rotary electric machine. (B) is a sectional side view of the rotating electrical machine. （ａ）は、部分拡大断面図。（ｂ）は、要部拡大断面図。(A) is a partial expanded sectional view. (B) is a principal part expanded sectional view. 別の実施形態を示す部分拡大断面図。The partial expanded sectional view which shows another embodiment. 別の実施形態を示す部分拡大断面図。The partial expanded sectional view which shows another embodiment. 別の実施形態を示す部分拡大断面図。The partial expanded sectional view which shows another embodiment.

以下、本発明を具体化した一実施形態を図１及び図２に基づいて説明する。
図１（ａ）に示すように、永久磁石埋設型回転電機Ｍを構成する固定子１１は、環状のステータコア１２と、ステータコア１２の内周に複数配列されたティース１２１間のスロット１２２に施されたコイル１３とからなる。スロット１２２は、環状の固定子１１の周方向に等ピッチで配列されている。 Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1A, the stator 11 constituting the permanent magnet-buried rotary electric machine M is applied to an annular stator core 12 and a slot 122 between a plurality of teeth 121 arranged on the inner periphery of the stator core 12. Coil 13. The slots 122 are arranged at an equal pitch in the circumferential direction of the annular stator 11.

図１（ｂ）に示すように、ステータコア１２は、磁性体（鋼板）製の複数枚のコア板１４を積層して構成されている。
図１（ａ）に示すように、永久磁石埋設型回転電機Ｍを構成する回転子１５は、ロータコア１６と、ロータコア１６内に埋設された平板形状の複数対（本実施形態では８対）の永久磁石１７Ａ，１７Ｂとからなる。対となるように隣り合う永久磁石１７Ａ，１７Ｂは、全て同形同大である。複数対の永久磁石１７Ａ，１７Ｂは、対単位で回転子１５の回転軸線Ｃを中心とした回転対称に配置されている。 As shown in FIG. 1B, the stator core 12 is formed by laminating a plurality of core plates 14 made of a magnetic material (steel plate).
As shown in FIG. 1A, the rotor 15 constituting the permanent magnet embedded type rotating electrical machine M includes a rotor core 16 and a plurality of flat plate-shaped pairs (8 pairs in the present embodiment) embedded in the rotor core 16. It consists of permanent magnets 17A and 17B. The permanent magnets 17A and 17B adjacent to each other as a pair are all the same shape and size. The plurality of pairs of permanent magnets 17A and 17B are arranged in a rotationally symmetrical manner about the rotation axis C of the rotor 15 in pairs.

図１（ｂ）に示すように、ロータコア１６は、磁性体（鋼板）製の複数枚のコア板１８を積層して構成されている。ロータコア１６の中心部には軸孔１６１が貫設されている。軸孔１６１には出力軸（図示略）が通されて固定される。   As shown in FIG.1 (b), the rotor core 16 is comprised by laminating | stacking the several core board 18 made from a magnetic body (steel plate). A shaft hole 161 is formed through the center of the rotor core 16. An output shaft (not shown) is passed through the shaft hole 161 and fixed.

図２（ａ）に示すように、対の永久磁石１７Ａ，１７Ｂは、軸孔１６１〔図１（ａ）参照〕の方向にロータコア１６に貫設された永久磁石収容部１９Ａ，１９Ｂに嵌入されている。永久磁石収容部１９Ａ，１９Ｂ内の永久磁石１７Ａ，１７Ｂは、永久磁石１７Ａ，１７Ｂと永久磁石収容部１９Ａ，１９Ｂの形成面との間に充填されて固化された樹脂（図示略）によって永久磁石収容部１９Ａ，１９Ｂ内で固定されている。   As shown in FIG. 2A, the pair of permanent magnets 17A and 17B are fitted into permanent magnet accommodating portions 19A and 19B penetrating the rotor core 16 in the direction of the shaft hole 161 (see FIG. 1A). ing. The permanent magnets 17A and 17B in the permanent magnet accommodating portions 19A and 19B are made of a resin (not shown) filled and solidified between the permanent magnets 17A and 17B and the surface where the permanent magnet accommodating portions 19A and 19B are formed. It is fixed in the accommodating portions 19A and 19B.

ロータコア１６の外周面１６２側における永久磁石１７Ａの面１７０Ａと永久磁石１７Ｂの面１７０Ｂとは、同じ磁極の磁極面１７０Ａ，１７０Ｂである。つまり、対の永久磁石１７Ａ，１７Ｂが１つの磁極を構成しており、複数対の永久磁石１７Ａ，１７Ｂは、対単位で周方向に交互に異なる磁極となるようにロータコア１６内に磁極として埋設されている。永久磁石１７Ａにおける外周面１６２に近い方の端面１７１Ａは、対の永久磁石１７Ａ，１７Ｂの一方の磁石端面１７１Ａである。永久磁石１７Ｂにおける外周面１６２に近い方の端面１７１Ｂは、対の永久磁石１７Ａ，１７Ｂの他方の磁石端面１７１Ｂである。磁極面１７０Ａにおける外周面１６２に近い方の端部１７２Ａは、対の永久磁石１７Ａ，１７Ｂの一方の磁極端部１７２Ａである。磁極面１７０Ｂにおける外周面１６２に近い方の端部１７２Ｂは、対の永久磁石１７Ａ，１７Ｂの他方の磁極端部１７２Ｂである。   The surface 170A of the permanent magnet 17A and the surface 170B of the permanent magnet 17B on the outer peripheral surface 162 side of the rotor core 16 are magnetic pole surfaces 170A and 170B having the same magnetic pole. That is, the pair of permanent magnets 17A and 17B constitute one magnetic pole, and the plurality of pairs of permanent magnets 17A and 17B are embedded as magnetic poles in the rotor core 16 so as to be different magnetic poles alternately in the circumferential direction in pairs. Has been. An end surface 171A closer to the outer peripheral surface 162 of the permanent magnet 17A is one magnet end surface 171A of the pair of permanent magnets 17A and 17B. The end surface 171B closer to the outer peripheral surface 162 of the permanent magnet 17B is the other magnet end surface 171B of the pair of permanent magnets 17A and 17B. An end portion 172A closer to the outer peripheral surface 162 of the magnetic pole surface 170A is one magnetic pole end portion 172A of the pair of permanent magnets 17A and 17B. The end 172B of the magnetic pole surface 170B closer to the outer peripheral surface 162 is the other magnetic pole end 172B of the pair of permanent magnets 17A and 17B.

永久磁石収容部１９Ａにおける外周面１６２に近い方の端付近には空隙２０Ａが永久磁石収容部１９Ａに連なるように設けられている。永久磁石収容部１９Ｂにおける外周面１６２に近い方の端付近には空隙２０Ｂが永久磁石収容部１９Ｂに連なるように設けられている。   An air gap 20A is provided in the vicinity of the end closer to the outer peripheral surface 162 of the permanent magnet housing portion 19A so as to continue to the permanent magnet housing portion 19A. An air gap 20B is provided near the end of the permanent magnet housing portion 19B near the outer peripheral surface 162 so as to be continuous with the permanent magnet housing portion 19B.

永久磁石収容部１９Ａ，１９Ｂに永久磁石１７Ａ，１７Ｂが収容された状態では、永久磁石１７Ａ，１７Ｂの両端側に磁束短絡防止用の空隙２０Ａ，２０Ｂが残される。永久磁石１７Ａを収容可能な永久磁石収容部１９Ａと、永久磁石１７Ａの磁極端部１７２Ａ側の空隙２０Ａとは、ロータコア１６に形成された収容孔を構成する。永久磁石１７Ｂを収容可能な永久磁石収容部１９Ｂと、永久磁石１７Ｂの磁極端部１７２Ｂ側の空隙２０Ｂとは、ロータコア１６に形成された収容孔を構成する。   In the state where the permanent magnets 17A and 17B are accommodated in the permanent magnet accommodating portions 19A and 19B, the gaps 20A and 20B for preventing magnetic flux short-circuiting are left on both ends of the permanent magnets 17A and 17B. The permanent magnet accommodating portion 19A capable of accommodating the permanent magnet 17A and the gap 20A on the magnetic pole end 172A side of the permanent magnet 17A constitute an accommodating hole formed in the rotor core 16. The permanent magnet housing part 19B capable of housing the permanent magnet 17B and the gap 20B on the magnetic pole end 172B side of the permanent magnet 17B constitute a housing hole formed in the rotor core 16.

図１（ａ）に示すｄ軸は、磁極がつくる磁束の方向（同磁極の永久磁石間の中心軸）を表し、ｑ軸は、ｄ軸と電気的、磁気的に直交する軸（異磁極の永久磁石間の軸）を表す。永久磁石１７Ａを収容する収容孔は、永久磁石収容部１９Ａ及び永久磁石収容部１９Ａのｑ軸側の空隙２０Ａからなる。永久磁石１７Ｂを収容する収容孔は、永久磁石収容部１９Ｂ及び永久磁石収容部１９Ｂのｑ軸側の空隙２０Ｂからなる。空隙２０Ａ，２０Ｂは、フラックスバリア（磁束障壁）として磁石磁束を効果的にトルクに作用するものである。   The d-axis shown in FIG. 1A represents the direction of the magnetic flux generated by the magnetic pole (the central axis between the permanent magnets of the same magnetic pole), and the q-axis is an axis (different magnetic pole) orthogonal to the d-axis electrically and magnetically. Axis between the permanent magnets). The accommodation hole for accommodating the permanent magnet 17A includes a permanent magnet accommodation portion 19A and a gap 20A on the q-axis side of the permanent magnet accommodation portion 19A. The accommodation hole for accommodating the permanent magnet 17B includes a permanent magnet accommodation portion 19B and a gap 20B on the q-axis side of the permanent magnet accommodation portion 19B. The air gaps 20A and 20B effectively act on the torque of the magnetic flux as a flux barrier (magnetic flux barrier).

図２（ａ）に示すように、一磁極当たりの永久磁石の個数は２個であり、磁極端部１７２Ａ，１７２Ｂは、永久磁石１７Ａ，１７Ｂのｑ軸側の磁極端部である。
永久磁石収容部１９Ａの形成面は、少なくとも、永久磁石１７Ａの磁極面１７０Ａと向き合う磁極側対向面１９１Ａと、永久磁石１７Ａの反磁極面１７３Ａと向き合う反磁極側対向面１９２Ａと、永久磁石１７Ａの磁石端面１７１Ａと向き合う対向端面１９３Ａとから構成されている。永久磁石収容部１９Ｂの形成面は、少なくとも、永久磁石１７Ｂの磁極面１７０Ｂと向き合う磁極側対向面１９１Ｂと、永久磁石１７Ｂの反磁極面１７３Ｂと向き合う反磁極側対向面１９２Ｂと、永久磁石１７Ｂの磁石端面１７１Ｂと向き合う対向端面１９３Ｂとから構成されている。 As shown in FIG. 2A, the number of permanent magnets per magnetic pole is two, and the magnetic pole end portions 172A and 172B are the magnetic pole end portions on the q-axis side of the permanent magnets 17A and 17B.
The formation surface of the permanent magnet housing portion 19A includes at least a magnetic pole side facing surface 191A facing the magnetic pole surface 170A of the permanent magnet 17A, an antimagnetic pole side facing surface 192A facing the antimagnetic pole surface 173A of the permanent magnet 17A, and the permanent magnet 17A. It is comprised from the opposing end surface 193A which faces the magnet end surface 171A. The formation surface of the permanent magnet housing portion 19B includes at least the magnetic pole side facing surface 191B facing the magnetic pole surface 170B of the permanent magnet 17B, the antimagnetic pole side facing surface 192B facing the antimagnetic pole surface 173B of the permanent magnet 17B, and the permanent magnet 17B. It is comprised from the opposing end surface 193B which faces the magnet end surface 171B.

空隙２０Ａ側の磁極端部１７２Ａ付近の磁極面１７０Ａとロータコア１６の外周面１６２との間には複数のスリット２１Ａ，２２Ａ，２３Ａが回転軸線Ｃ〔図１（ｂ）参照〕と平行な方向へロータコア１６を貫通するように形成されている。複数のスリット２１Ａ，２２Ａ，２３Ａは、磁極側対向面１９１Ａに沿って永久磁石収容部１９Ａから空隙２０Ａに向かう方向に間隔をおいて平行に配置されている。   Between the magnetic pole surface 170A near the magnetic pole end 172A on the air gap 20A side and the outer peripheral surface 162 of the rotor core 16, a plurality of slits 21A, 22A, 23A are parallel to the rotation axis C (see FIG. 1B). It is formed so as to penetrate the rotor core 16. The plurality of slits 21A, 22A, 23A are arranged in parallel along the magnetic pole side facing surface 191A at intervals in the direction from the permanent magnet housing portion 19A toward the air gap 20A.

複数のスリット２１Ａ，２２Ａ，２３Ａは、磁極側対向面１９１Ａの空隙２０Ａ側の端１９４Ａを通って磁極側対向面１９１Ａに垂直、且つ回転軸線Ｃと平行な仮想平面Ｓ１と、磁極側対向面１９１Ａの中央１９５Ａを通って磁極側対向面１９１Ａに垂直、且つ回転軸線Ｃと平行な仮想平面Ｓ２との間にある。スリット２３Ａは、仮想平面Ｓ１から離れた位置に形成されている。   The plurality of slits 21A, 22A, 23A pass through an end 194A on the air gap 20A side of the magnetic pole side facing surface 191A, perpendicular to the magnetic pole side facing surface 191A, and parallel to the rotation axis C, and the magnetic pole side facing surface 191A. Imaginary plane S2 perpendicular to the magnetic pole side facing surface 191A and parallel to the rotation axis C. The slit 23A is formed at a position away from the virtual plane S1.

図２（ｂ）に示すように、複数のスリット２１Ａ，２２Ａ，２３Ａは、ロータコア１６の外周面１６２から離れた位置を始端２１０Ａ，２２０Ａ，２３０Ａとして磁極側対向面１９１Ａに向かっている。始端２１０Ａ，２２０Ａ，２３０Ａは、永久磁石１７Ａの収容孔とロータコア１６の外周面１６２との間にある。スリット２３Ａの始端２３０Ａは、スリット２２Ａの始端２２０Ａよりも磁極側対向面１９１Ａから遠くにある。スリット２２Ａの始端２２０Ａは、スリット２１Ａの始端２１０Ａよりも磁極側対向面１９１Ａから遠くにある。つまり、スリット２１Ａ，２２Ａ，２３Ａの始端２１０Ａ，２２０Ａ，２３０Ａは、空隙２０Ａ寄りになるにつれて磁極側対向面１９１Ａから遠くにある。   As shown in FIG. 2B, the plurality of slits 21A, 22A, and 23A are directed toward the magnetic pole side facing surface 191A with the positions separated from the outer peripheral surface 162 of the rotor core 16 being the start ends 210A, 220A, and 230A. The start ends 210 </ b> A, 220 </ b> A, and 230 </ b> A are located between the accommodation hole of the permanent magnet 17 </ b> A and the outer peripheral surface 162 of the rotor core 16. The starting end 230A of the slit 23A is farther from the magnetic pole side facing surface 191A than the starting end 220A of the slit 22A. The starting end 220A of the slit 22A is further from the magnetic pole side facing surface 191A than the starting end 210A of the slit 21A. That is, the starting ends 210A, 220A, and 230A of the slits 21A, 22A, and 23A are farther from the magnetic pole side facing surface 191A as they approach the gap 20A.

スリット２１Ａ，２２Ａ，２３Ａは、磁極側対向面１９１Ａに対して垂直であって磁極側対向面１９１Ａから離れた位置に形成されている。スリット２３Ａ，２２Ａ，２１Ａの長さ（磁極側対向面１９１Ａから遠ざかる方向の長さ）は、空隙２０Ａ寄りになるにつれて長くなる。つまり、スリット２３Ａの長さは、スリット２２Ａよりも長く、スリット２２Ａの長さは、スリット２１Ａよりも長い。つまり、複数のスリット２３Ａ，２２Ａ，２１Ａのうち１つのスリットに対して空隙２０Ａ側で隣り合うスリットの長さは、前記１つのスリットの長さよりも大きい。   The slits 21A, 22A, and 23A are formed at positions perpendicular to the magnetic pole side facing surface 191A and away from the magnetic pole side facing surface 191A. The lengths of the slits 23A, 22A, 21A (the length in the direction away from the magnetic pole side facing surface 191A) become longer as they approach the gap 20A. That is, the length of the slit 23A is longer than the slit 22A, and the length of the slit 22A is longer than the slit 21A. That is, the length of the slit adjacent on the air gap 20A side with respect to one slit among the plurality of slits 23A, 22A, and 21A is larger than the length of the one slit.

図２（ａ）に示すように、空隙２０Ｂ側にも複数のスリット２１Ａ，２２Ａ，２３Ａと同様の複数のスリット２１Ｂ，２２Ｂ，２３Ｂが形成されている。複数のスリット２１Ｂ，２２Ｂ，２３Ｂは、磁極側対向面１９１Ｂに沿って永久磁石収容部１９Ｂから空隙２０Ｂに向かう方向に間隔をおいて平行に配置されている。   As shown in FIG. 2A, a plurality of slits 21B, 22B, and 23B similar to the plurality of slits 21A, 22A, and 23A are also formed on the gap 20B side. The plurality of slits 21B, 22B, and 23B are disposed in parallel along the magnetic pole side facing surface 191B at intervals in the direction from the permanent magnet housing portion 19B toward the air gap 20B.

複数のスリット２１Ｂ，２２Ｂ，２３Ｂは、磁極側対向面１９１Ｂの空隙２０Ｂの端１９４Ｂを通って磁極側対向面１９１Ｂに垂直である。又、複数のスリット２１Ｂ，２２Ｂ，２３Ｂは、回転軸線Ｃ〔図１（ｂ）参照〕と平行な仮想平面Ｓ３と、磁極側対向面１９１Ｂの中央１９５Ｂを通って磁極側対向面１９１Ｂに垂直、且つ回転軸線Ｃと平行な仮想平面Ｓ４との間にある。スリット２３Ｂは、仮想平面Ｓ３から離れた位置に形成されている。   The plurality of slits 21B, 22B, and 23B are perpendicular to the magnetic pole side facing surface 191B through the end 194B of the gap 20B of the magnetic pole side facing surface 191B. The plurality of slits 21B, 22B, and 23B pass through a virtual plane S3 parallel to the rotation axis C [see FIG. 1B] and the center 195B of the magnetic pole side opposing surface 191B, and are perpendicular to the magnetic pole side opposing surface 191B. And between the rotation axis C and a virtual plane S4 parallel to it. The slit 23B is formed at a position away from the virtual plane S3.

複数のスリット２１Ｂ，２２Ｂ，２３Ｂは、ロータコア１６の外周面１６２から離れた位置を始端２１０Ｂ，２２０Ｂ，２３０Ｂとして磁極側対向面１９１Ｂに向かっている。スリット２３Ｂの始端２３０Ｂは、スリット２２Ｂの始端２２０Ｂよりも磁極側対向面１９１Ｂから遠くにある。スリット２２Ｂの始端２２０Ｂは、スリット２１Ｂの始端２１０Ｂよりも磁極側対向面１９１Ｂから遠くにある。つまり、スリット２１Ｂ，２２Ｂ，２３Ｂの始端２１０Ｂ，２２０Ｂ，２３０Ｂは、空隙２０Ｂ寄りになるにつれて磁極側対向面１９１Ｂから遠くにある。   The plurality of slits 21B, 22B, and 23B are directed toward the magnetic pole side facing surface 191B with the positions away from the outer peripheral surface 162 of the rotor core 16 as starting ends 210B, 220B, and 230B. The starting end 230B of the slit 23B is farther from the magnetic pole side facing surface 191B than the starting end 220B of the slit 22B. The starting end 220B of the slit 22B is farther from the magnetic pole side facing surface 191B than the starting end 210B of the slit 21B. That is, the start ends 210B, 220B, and 230B of the slits 21B, 22B, and 23B are farther from the magnetic pole side facing surface 191B as they approach the gap 20B.

スリット２１Ｂ，２２Ｂ，２３Ｂは、磁極側対向面１９１Ｂに対して垂直であって磁極側対向面１９１Ｂから離れた位置に形成されている。スリット２３Ｂ，２２Ｂ，２１Ｂの長さ（磁極側対向面１９１Ｂから遠ざかる方向の長さ）は、空隙２０Ｂ寄りになるにつれて長くなる。   The slits 21B, 22B, and 23B are formed at positions perpendicular to the magnetic pole side facing surface 191B and away from the magnetic pole side facing surface 191B. The lengths of the slits 23B, 22B, and 21B (the length in the direction away from the magnetic pole-side facing surface 191B) become longer as they approach the gap 20B.

コイル１３への通電によって回転子１５が図１（ａ）に矢印Ｒで示す方向に回転するとする。複数のスリット２１Ａ，２２Ａ，２３Ａは、永久磁石１７Ａの磁極面１７０Ａの中央部からの磁束をロータコア１６の外周面１６２へ向けさせる。つまり、永久磁石１７Ａの磁極面１７０Ａの中央部からの磁束は、磁極端部１７２Ａとロータコア１６の外周面１６２との間へ向かうのを複数のスリット２１Ａ，２２Ａ，２３Ａによって抑制される。そのため、空隙２０Ａとロータコア１６の外周面１６２との間での磁気飽和が抑制され、永久磁石１７Ａの減磁耐量が向上する。   It is assumed that the rotor 15 rotates in the direction indicated by the arrow R in FIG. The plurality of slits 21 </ b> A, 22 </ b> A, 23 </ b> A direct the magnetic flux from the central portion of the magnetic pole surface 170 </ b> A of the permanent magnet 17 </ b> A toward the outer peripheral surface 162 of the rotor core 16. That is, the magnetic flux from the central portion of the magnetic pole surface 170A of the permanent magnet 17A is suppressed by the plurality of slits 21A, 22A, and 23A from moving between the magnetic pole end portion 172A and the outer peripheral surface 162 of the rotor core 16. Therefore, magnetic saturation between the air gap 20A and the outer peripheral surface 162 of the rotor core 16 is suppressed, and the demagnetization resistance of the permanent magnet 17A is improved.

コイル１３への通電によって回転子１５が図１（ａ）に矢印Ｒで示す方向とは反対方向に回転するとする。複数のスリット２１Ｂ，２２Ｂ，２３Ｂは、永久磁石１７Ｂの磁極面１７０Ｂの中央部からの磁束をロータコア１６の外周面１６２へ向けさせる。つまり、永久磁石１７Ｂの磁極面１７０Ｂの中央部からの磁束は、磁極端部１７２Ｂとロータコア１６の外周面１６２との間へ向かうのを複数のスリット２１Ｂ，２２Ｂ，２３Ｂによって抑制される。そのため、空隙２０Ｂとロータコア１６の外周面１６２との間での磁気飽和が抑制され、永久磁石１７Ｂの減磁耐量が向上する。   It is assumed that the rotor 15 rotates in a direction opposite to the direction indicated by the arrow R in FIG. The plurality of slits 21 </ b> B, 22 </ b> B, and 23 </ b> B direct the magnetic flux from the central portion of the magnetic pole surface 170 </ b> B of the permanent magnet 17 </ b> B toward the outer peripheral surface 162 of the rotor core 16. That is, the magnetic flux from the central portion of the magnetic pole surface 170B of the permanent magnet 17B is suppressed by the plurality of slits 21B, 22B, and 23B from moving toward the gap between the magnetic pole end 172B and the outer peripheral surface 162 of the rotor core 16. Therefore, magnetic saturation between the air gap 20B and the outer peripheral surface 162 of the rotor core 16 is suppressed, and the demagnetization resistance of the permanent magnet 17B is improved.

本実施形態では以下の効果が得られる。
（１）複数のスリット２１Ａ，２２Ａ，２３Ａは、永久磁石１７Ａの磁極面１７０Ａの中央側から出る磁束が磁極端部１７２Ａとロータコア１６の外周面１６２との間の部位に向かうのを抑制する。同様に、複数のスリット２１Ｂ，２２Ｂ，２３Ｂは、永久磁石１７Ｂの磁極面１７０Ｂの中央側から出る磁束が磁極端部１７２Ｂとロータコア１６の外周面１６２との間の部位に向かうのを抑制する。そのため、対の永久磁石１７Ａ，１７Ｂの磁極端部１７２Ａ，１７２Ｂ付近での磁気飽和が抑制されて減磁耐量が向上する。 In the present embodiment, the following effects can be obtained.
(1) The plurality of slits 21 </ b> A, 22 </ b> A, and 23 </ b> A suppress the magnetic flux that exits from the center side of the magnetic pole surface 170 </ b> A of the permanent magnet 17 </ b> A toward the portion between the magnetic pole end 172 </ b> A and the outer peripheral surface 162 of the rotor core 16. Similarly, the plurality of slits 21 </ b> B, 22 </ b> B, 23 </ b> B suppress the magnetic flux emitted from the center side of the magnetic pole surface 170 </ b> B of the permanent magnet 17 </ b> B from going to the portion between the magnetic pole end 172 </ b> B and the outer peripheral surface 162 of the rotor core 16. Therefore, magnetic saturation near the magnetic pole end portions 172A and 172B of the pair of permanent magnets 17A and 17B is suppressed, and the demagnetization resistance is improved.

（２）複数のスリット２１Ａ，２２Ａ，２３Ａは、磁極側対向面１９１Ａから離れた位置に形成されており、複数のスリット２１Ｂ，２２Ｂ，２３Ｂは、磁極側対向面１９１Ｂから離れた位置に形成されている。そのため、永久磁石１７Ａ，１７Ｂと永久磁石収容部１９Ａ，１９Ｂの形成面との間に充填された樹脂がスリット２１Ａ，２２Ａ，２３Ａ，２１Ｂ，２２Ｂ，２３Ｂ内へ流入することはない。その結果、永久磁石１７Ａ，１７Ｂと永久磁石収容部１９Ａ，１９Ｂの形成面との間の樹脂充填が良好に行なわれる。   (2) The plurality of slits 21A, 22A, and 23A are formed at positions separated from the magnetic pole side facing surface 191A, and the plurality of slits 21B, 22B, and 23B are formed at positions separated from the magnetic pole side facing surface 191B. ing. Therefore, the resin filled between the permanent magnets 17A and 17B and the formation surface of the permanent magnet housing portions 19A and 19B does not flow into the slits 21A, 22A, 23A, 21B, 22B, and 23B. As a result, the resin filling between the permanent magnets 17A and 17B and the surfaces on which the permanent magnet housing portions 19A and 19B are formed is favorably performed.

（３）複数のスリット２１Ａ，２２Ａ，２３Ａ，２１Ｂ，２２Ｂ，２３Ｂは、ロータコア１６を構成するコア板１８をプレス成形することによって形成される。複数のスリット２１Ａ，２２Ａ，２３Ａ，２１Ｂ，２２Ｂ，２３Ｂを平行とする構成は、コア板１８をプレス成形するためのプレス型の形成を容易にする。   (3) The plurality of slits 21 </ b> A, 22 </ b> A, 23 </ b> A, 21 </ b> B, 22 </ b> B, 23 </ b> B are formed by press-molding the core plate 18 constituting the rotor core 16. The configuration in which the plurality of slits 21A, 22A, 23A, 21B, 22B, and 23B are parallel facilitates formation of a press die for press-molding the core plate 18.

（４）磁石端部付近における磁気飽和は、回転子１５の回転方向側の磁石端部とロータコア１６の外周面１６２との間に生じ易い。空隙２０Ａ，２０Ｂのいずれの側にも複数のスリット２１Ａ，２２Ａ，２３Ａ及び複数のスリット２１Ｂ，２２Ｂ，２３Ｂを設ける構成は、回転子１５を両方に回転して使用する場合に好適である。   (4) Magnetic saturation near the magnet end tends to occur between the magnet end on the rotation direction side of the rotor 15 and the outer peripheral surface 162 of the rotor core 16. The configuration in which the plurality of slits 21A, 22A, 23A and the plurality of slits 21B, 22B, 23B are provided on either side of the gaps 20A, 20B is suitable when the rotor 15 is rotated and used in both.

本発明では以下のような実施形態も可能である。
○図３あるいは図４に示すように、複数のスリット２１Ｃ，２２Ｃ，２３Ｃが磁極側対向面１９１Ａに対して傾いていてもよく、複数のスリット２１Ｄ，２２Ｄ，２３Ｄが磁極側対向面１９１Ｂに対して傾いていてもよい。 In the present invention, the following embodiments are also possible.
As shown in FIG. 3 or 4, the plurality of slits 21C, 22C, and 23C may be inclined with respect to the magnetic pole side facing surface 191A, and the plurality of slits 21D, 22D, and 23D are formed with respect to the magnetic pole side facing surface 191B. It may be inclined.

○図５に示すように、複数のスリット２１Ｅ，２２Ｅ，２３Ｅが磁極側対向面１９１Ａ上に開口していてもよく、複数のスリット２１Ｆ，２２Ｆ，２３Ｆが磁極側対向面１９１Ｂ上に開口していてもよい。つまり、スリット２１Ｅ，２２Ｅ，２３Ｅは、空隙２０Ａ側の収容孔と繋がっていてもよく、スリット２１Ｆ，２２Ｆ，２３Ｆは、空隙２０Ｂ側の収容孔と繋がっていてもよい。このようにすれば、磁極中央部付近から出る磁束が磁極端部１７２Ａ，１７２Ｂとロータコア１６の外周面１６２との間の部位に向かうのを抑制する効果が更に高くなる。その結果、磁極端部１７２Ａ，１７２Ｂとロータコア１６の外周面１６２との間での磁気飽和の抑制効果が更に高くなる。   As shown in FIG. 5, a plurality of slits 21E, 22E, 23E may be opened on the magnetic pole side facing surface 191A, and a plurality of slits 21F, 22F, 23F are opened on the magnetic pole side facing surface 191B. May be. That is, the slits 21E, 22E, and 23E may be connected to the accommodation holes on the gap 20A side, and the slits 21F, 22F, and 23F may be connected to the accommodation holes on the gap 20B side. In this way, the effect of suppressing the magnetic flux from the vicinity of the magnetic pole central portion from being directed to the portion between the magnetic pole end portions 172A and 172B and the outer peripheral surface 162 of the rotor core 16 is further enhanced. As a result, the effect of suppressing magnetic saturation between the magnetic pole end portions 172A and 172B and the outer peripheral surface 162 of the rotor core 16 is further enhanced.

○最も長いスリット２３Ａ，２３Ｂが仮想平面Ｓ１，Ｓ３上にあってもよい。
○回転子１５が一方向にのみ回転される場合には、回転子１５の回転方向側の空隙側にのみ複数のスリットを設けてもよい。 The longest slits 23A and 23B may be on the virtual planes S1 and S3.
In the case where the rotor 15 is rotated only in one direction, a plurality of slits may be provided only on the gap side on the rotation direction side of the rotor 15.

○同じ磁極面を有する永久磁石の組み合わせは、1個であってもよいし、３個以上で一組であってもよい。
○単一の平板形状の永久磁石によって磁極を構成するようにした回転子に本発明を適用してもよい。この場合、仮想平面Ｓ２，Ｓ４は、単一の平板形状の永久磁石を収容する収容孔の磁極側対向面の端から磁極側対向面の長さの１／４の位置にある。この場合にも、（１）〜（４）項と同様の効果が得られる。 The number of combinations of permanent magnets having the same magnetic pole surface may be one, or three or more may be a set.
The present invention may be applied to a rotor in which a magnetic pole is constituted by a single flat plate-shaped permanent magnet. In this case, the imaginary planes S2 and S4 are located at 1/4 of the length of the magnetic pole side opposing surface from the end of the magnetic pole side opposing surface of the accommodation hole that accommodates a single flat plate-shaped permanent magnet. Also in this case, the same effects as the items (1) to (4) can be obtained.

１５…回転子。１６…ロータコア。１７Ａ，１７Ｂ…対の永久磁石。１７０Ａ，１７０Ｂ…磁極面。１７２Ａ，１７２Ｂ…磁極端部。１９Ａ，１９Ｂ…収容孔を構成する永久磁石収容部。１９１Ａ，１９１Ｂ…磁極側対向面。１９２Ａ，１９２Ｂ…反磁極側対向面。２０Ａ，２０Ｂ…収容孔を構成する空隙。２１Ａ，２２Ａ，２３Ａ，２１Ｂ，２２Ｂ，２３Ｂ，２１Ｃ，２２Ｃ，２３Ｃ，２１Ｄ，２２Ｄ，２３Ｄ，２３Ｅ，２３Ｆ…スリット。２１０Ａ，２２０Ａ，２３０Ａ，２１０Ｂ，２２０Ｂ，２３０Ｂ…始端。Ｍ…永久磁石埋設型回転電機。   15 ... Rotor. 16 ... Rotor core. 17A, 17B ... A pair of permanent magnets. 170A, 170B: Magnetic pole surface. 172A, 172B ... Magnetic pole ends. 19A, 19B... Permanent magnet housing portions that form housing holes. 191A, 191B ... Magnetic pole side facing surface. 192A, 192B ... Anti-magnetic pole side facing surface. 20A, 20B: gaps that form the accommodation holes. 21A, 22A, 23A, 21B, 22B, 23B, 21C, 22C, 23C, 21D, 22D, 23D, 23E, 23F... Slit. 210A, 220A, 230A, 210B, 220B, 230B... M: Permanent magnet buried type rotating electric machine.

Claims (6)

ロータコアに形成された収容孔に永久磁石が収容されている回転電機の永久磁石埋設型回転子において、
前記収容孔は、少なくとも、前記永久磁石が収容可能な永久磁石収容部及び前記永久磁石収容部のｑ軸側の空隙からなり、
前記収容孔と前記ロータコアの外周面との間を始端として前記収容孔に向かう複数のスリットが前記ロータコアに形成されており、
前記スリットは、前記永久磁石の磁極面と向き合う前記収容孔の磁極側対向面に沿って前記永久磁石収容部から前記空隙に向かう方向に間隔をおいて配置されており、前記スリットの長さは、前記空隙寄りになるにつれて長くなり、前記スリットの始端は、前記空隙寄りになるにつれて前記磁極側対向面から遠くにある回転電機の永久磁石埋設型回転子。 In the permanent magnet embedded rotor of the rotating electrical machine in which the permanent magnet is accommodated in the accommodation hole formed in the rotor core,
The accommodation hole is composed of at least a permanent magnet accommodation portion capable of accommodating the permanent magnet and a gap on the q-axis side of the permanent magnet accommodation portion,
A plurality of slits are formed in the rotor core starting from the space between the housing hole and the outer peripheral surface of the rotor core toward the housing hole,
The slits are arranged at intervals in the direction from the permanent magnet housing portion toward the gap along the magnetic pole side facing surface of the housing hole facing the magnetic pole surface of the permanent magnet, and the length of the slit is The permanent magnet embedded rotor of a rotating electrical machine that becomes longer as it approaches the gap, and the starting end of the slit becomes farther from the magnetic pole side facing surface as it approaches the gap. 前記スリットは、互いに平行に形成されている請求項１に記載の回転電機の永久磁石埋設型回転子。   The permanent magnet embedded rotor of a rotating electrical machine according to claim 1, wherein the slits are formed in parallel to each other. 前記スリットは、前記磁極側対向面に対して垂直に形成されている請求項２に記載の回転電機の永久磁石埋設型回転子。   The permanent magnet embedded rotor of a rotating electrical machine according to claim 2, wherein the slit is formed perpendicular to the magnetic pole side facing surface. 前記スリットは、前記収容孔から離れた位置に形成されている請求項１乃至請求項３のいずれか１項に記載の回転電機の永久磁石埋設型回転子。   4. The permanent magnet embedded rotor of a rotating electrical machine according to claim 1, wherein the slit is formed at a position away from the accommodation hole. 5. 前記スリットと前記収容孔とが繋がっている請求項１乃至請求項３のいずれか１項に記載の回転電機の永久磁石埋設型回転子。   The permanent magnet embedded type rotor of the rotary electric machine according to any one of claims 1 to 3, wherein the slit and the accommodation hole are connected to each other. ロータコアに形成された収容孔に永久磁石が収容されている永久磁石埋設型回転子を備えた回転電機において、
前記永久磁石埋設型回転子は、請求項１乃至請求項５のいずれか１項に記載の永久磁石埋設型回転子である回転電機。 In a rotating electrical machine including a permanent magnet embedded rotor in which a permanent magnet is housed in a housing hole formed in a rotor core,
6. The rotating electrical machine according to claim 1, wherein the permanent magnet embedded rotor is a permanent magnet embedded rotor according to claim 1.
JP2010061082A 2010-03-17 2010-03-17 Permanent magnet embedded rotor for rotary electric machine, and rotary electric machine Pending JP2011199947A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014226008A (en) * 2013-05-17 2014-12-04 本田技研工業株式会社 Rotor of rotary electric machine
JP2017123779A (en) * 2017-03-09 2017-07-13 本田技研工業株式会社 Rotor for rotary electric machine
US9735632B2 (en) 2012-04-10 2017-08-15 Honda Motor Co., Ltd. Rotating electric machine rotor
CN108206596A (en) * 2016-12-16 2018-06-26 福特全球技术公司 For the slotted rotor bridge of motor
WO2019043850A1 (en) * 2017-08-30 2019-03-07 三菱電機株式会社 Rotor, electric motor, compressor, and air conditioning device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9735632B2 (en) 2012-04-10 2017-08-15 Honda Motor Co., Ltd. Rotating electric machine rotor
JP2014226008A (en) * 2013-05-17 2014-12-04 本田技研工業株式会社 Rotor of rotary electric machine
CN108206596A (en) * 2016-12-16 2018-06-26 福特全球技术公司 For the slotted rotor bridge of motor
CN108206596B (en) * 2016-12-16 2022-06-17 福特全球技术公司 Slotted rotor bridge for an electric machine
JP2017123779A (en) * 2017-03-09 2017-07-13 本田技研工業株式会社 Rotor for rotary electric machine
WO2019043850A1 (en) * 2017-08-30 2019-03-07 三菱電機株式会社 Rotor, electric motor, compressor, and air conditioning device
CN111033947A (en) * 2017-08-30 2020-04-17 三菱电机株式会社 Rotor, motor, compressor, and air conditioner
CN111033947B (en) * 2017-08-30 2022-02-25 三菱电机株式会社 Rotor, motor, compressor, and air conditioner

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