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JP2014090638A - Permanent magnet type rotary electric machine, rotor, and stator - Google Patents

Permanent magnet type rotary electric machine, rotor, and stator Download PDF

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JP2014090638A
JP2014090638A JP2012240563A JP2012240563A JP2014090638A JP 2014090638 A JP2014090638 A JP 2014090638A JP 2012240563 A JP2012240563 A JP 2012240563A JP 2012240563 A JP2012240563 A JP 2012240563A JP 2014090638 A JP2014090638 A JP 2014090638A
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magnetic
stator
permanent magnet
rotor
magnet type
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JP6189030B2 (en
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Makoto Matsushita
真琴 松下
Norio Takahashi
則雄 高橋
Yutaka Hashiba
豊 橋場
Daisuke Misu
大輔 三須
Katsunori Takeuchi
活徳 竹内
Toshiro Hasebe
寿郎 長谷部
Koji Fujiwara
耕二 藤原
Yasuto Takahashi
康人 高橋
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Toshiba Corp
Doshisha Co Ltd
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Doshisha Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/64Electric machine technologies in electromobility

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  • Permanent Magnet Type Synchronous Machine (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

【課題】トルクを低下させることなく、コギングトルクを低減させることを可能とする。
【解決手段】実施形態の永久磁石式回転電機は、固定子鉄心に電機子巻線を有する固定子と、固定子内に回転可能に配置される回転子鉄心に永久磁石を埋設し、回転子鉄心の外周に複数の磁極部を有する回転子と、回転子鉄心の外周の全周又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部と、を備える。
【選択図】図2
A cogging torque can be reduced without lowering the torque.
A permanent magnet type rotating electrical machine according to an embodiment includes a stator having an armature winding in a stator core, and a permanent magnet embedded in a rotor core disposed rotatably in the stator. A rotor having a plurality of magnetic pole portions on the outer periphery of the iron core, and a magnetic deterioration portion having a magnetic property deteriorated with a predetermined thickness on the entire periphery or a part of the outer periphery of the rotor core.
[Selection] Figure 2

Description

本発明の実施形態は、永久磁石式回転電機、回転子、及び固定子に関する。   Embodiments described herein relate generally to a permanent magnet type rotating electrical machine, a rotor, and a stator.

従来、電車、ハイブリッド自動車、電気自動車向けの回転電機においては、艤装スペースが小さく、限られた空間での高トルク、高出力化の要求がある。この要求を満たす回転電機としては、近年の目覚しい研究開発によって高磁気エネルギー積の永久磁石が開発されたことから、永久磁石式リアクタンス型回転電機(以下、永久磁石式回転電機)が注目されている。   Conventionally, rotating electric machines for trains, hybrid cars, and electric cars have a small equipment space, and there is a demand for high torque and high output in a limited space. As a rotating electrical machine that satisfies this requirement, a permanent magnet with a high magnetic energy product has been developed by remarkable research and development in recent years. Therefore, a permanent magnet type reactance type rotating electrical machine (hereinafter referred to as a permanent magnet type rotating electrical machine) has attracted attention. .

永久磁石式回転電機においては、回転子の磁気変動に起因するコギングトルクがスムーズな回転を妨げる場合がある。また、高エネルギー密度の永久磁石式回転電機では、電磁加振力も増加し、振動、騒音の増加がある。特に電車やハイブリッド自動車向けでは、車室内の静粛性、並びに車外への騒音低減が厳しく求められる。このため、永久磁石式回転電機では、回転子の表面で、且つ磁極中心に対応する位置に溝を配置し、コギングトルクの抑制、振動、騒音の抑制、且つ鉄損の低減を行うものがある。   In a permanent magnet type rotating electrical machine, cogging torque resulting from magnetic fluctuations of the rotor may prevent smooth rotation. In addition, in a high energy density permanent magnet type rotating electrical machine, electromagnetic excitation force increases, and vibration and noise increase. Especially for trains and hybrid cars, quietness in the passenger compartment and noise reduction outside the vehicle are strictly required. For this reason, in some permanent magnet type rotating electrical machines, a groove is disposed on the surface of the rotor and at a position corresponding to the center of the magnetic pole to suppress cogging torque, vibration, noise, and iron loss. .

特開平11−164501号公報Japanese Patent Laid-Open No. 11-164501 特開2004−328956号公報Japanese Patent Laid-Open No. 2004-328956

しかしながら、上述した従来技術では、回転子の表面に配置された溝によって、高速軽負荷時、または無負荷運転の低磁束密度時においてはコギングトルクを抑制することが可能であるが、高トルク運転(低速高負荷時)の高磁束密度では溝で磁束の流れが阻害されるためトルクが大幅に低下する場合があった。したがって、高速域を含む全領域において、トルクを低下させることなく、コギングトルクを低減させることの両立は困難であった。   However, in the above-described prior art, the cogging torque can be suppressed by the groove arranged on the surface of the rotor at high speed and light load or at low magnetic flux density in no load operation. At a high magnetic flux density (at low speed and high load), the flow of magnetic flux is obstructed by the groove, so that the torque may be significantly reduced. Therefore, it has been difficult to reduce the cogging torque without reducing the torque in the entire region including the high speed region.

上述した課題を解決するために、実施形態の永久磁石式回転電機は、固定子鉄心に電機子巻線を有する固定子と、前記固定子内に回転可能に配置される回転子鉄心に永久磁石を埋設し、前記回転子鉄心の外周に複数の磁極部を有する回転子と、前記回転子鉄心の外周の全周又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部と、を備える。   In order to solve the above-described problems, a permanent magnet type rotating electric machine according to an embodiment includes a stator having an armature winding in a stator core, and a permanent magnet in a rotor core that is rotatably arranged in the stator. A rotor having a plurality of magnetic pole portions on the outer periphery of the rotor core, and a magnetically deteriorated portion that has deteriorated magnetic characteristics with a predetermined thickness on the entire periphery or part of the outer periphery of the rotor core. Prepare.

また、実施形態の永久磁石式回転電機は、電機子巻線を収納する固定子スロットに挟まれた固定子ティースを固定子鉄心の内周に有する固定子と、前記固定子内に回転可能に配置される回転子鉄心に永久磁石を埋設し、前記回転子鉄心の外周に複数の磁極部を有する回転子と、前記固定子ティースの前記回転子に面する先端部の全部又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部と、を備える。   In addition, the permanent magnet type rotating electric machine of the embodiment has a stator having stator teeth sandwiched between stator slots for accommodating armature windings on the inner periphery of the stator core, and is rotatable in the stator. A permanent magnet is embedded in a rotor core to be disposed, and a rotor having a plurality of magnetic pole portions on the outer periphery of the rotor core, and a predetermined part in all or a part of the tip of the stator teeth facing the rotor And a magnetically deteriorated portion having a magnetic property deteriorated with a thickness of.

また、実施形態の永久磁石式回転電機の回転子は、固定子内に回転可能に配置される回転子鉄心に永久磁石を埋設し、前記回転子鉄心の外周に複数の磁極部を有し、前記回転子鉄心の外周の全周又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部を備える。   Further, the rotor of the permanent magnet type rotating electrical machine of the embodiment has a permanent magnet embedded in a rotor core disposed rotatably in the stator, and has a plurality of magnetic pole portions on the outer periphery of the rotor core, The magnetic deterioration part which deteriorated the magnetic characteristic by predetermined thickness in the whole periphery or a part of the outer periphery of the said rotor core is provided.

また、実施形態の回転電機の固定子は、電機子巻線を収納する固定子スロットに挟まれた固定子ティースを固定子鉄心の内周に有し、前記固定子ティースの先端部の全部又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部を備える。   Further, the stator of the rotating electric machine according to the embodiment has a stator tooth sandwiched between stator slots for accommodating the armature windings on the inner periphery of the stator core, and all or a front end portion of the stator tooth. The magnetic deterioration part which deteriorated the magnetic characteristic by predetermined thickness in one part is provided.

図1は、第1の実施形態にかかる永久磁石式回転電機の回転子径方向断面図である。FIG. 1 is a rotor radial direction cross-sectional view of the permanent magnet type rotating electrical machine according to the first embodiment. 図2は、図1における拡大領域の拡大図である。FIG. 2 is an enlarged view of the enlarged region in FIG. 図3は、磁気特性の劣化を示すグラフである。FIG. 3 is a graph showing deterioration of magnetic characteristics. 図4は、磁気特性の劣化を示すグラフである。FIG. 4 is a graph showing deterioration of magnetic characteristics. 図5は、磁気特性の劣化の有無におけるコギングトルクを例示するグラフである。FIG. 5 is a graph illustrating the cogging torque with and without the deterioration of the magnetic characteristics. 図6は、第2の実施形態にかかる拡大領域の拡大図である。FIG. 6 is an enlarged view of an enlarged region according to the second embodiment. 図7は、第2の実施形態の変形例にかかる拡大領域の拡大図である。FIG. 7 is an enlarged view of an enlarged region according to a modification of the second embodiment.

以下、添付図面を参照して実施形態にかかる永久磁石式回転電機、回転子、及び固定子を詳細に説明する。なお、本実施形態では極数が8極である場合の永久磁石式回転電機を説明するが、他の極数でも同様に適用できることは言うまでもないことである。また、各実施形態において、同一の構成には同一の符号を付して、重複する説明は省略している。   Hereinafter, a permanent magnet type rotating electrical machine, a rotor, and a stator according to embodiments will be described in detail with reference to the accompanying drawings. In addition, although this embodiment demonstrates the permanent magnet type rotary electric machine in case the number of poles is eight, it cannot be overemphasized that it can apply similarly in other pole numbers. Moreover, in each embodiment, the same code | symbol is attached | subjected to the same structure and the overlapping description is abbreviate | omitted.

[第1の実施形態]
図1は、第1の実施形態にかかる永久磁石式回転電機100の回転子径方向断面図である。図2は、図1における拡大領域Rの拡大図である。図1、2に示すように、永久磁石式回転電機100は、固定子鉄心11に電機子巻線20を有する固定子10と、固定子10内に回転可能に配置される回転子30とを備える。固定子鉄心11は、電磁鋼板を積層(図1に向かった奥行き方向に)した構成である。固定子鉄心11の内周側には、電機子巻線20を収容するスロット40と、スロット40に挟まれたティース50とを具備している。
[First Embodiment]
FIG. 1 is a rotor radial direction cross-sectional view of a permanent magnet type rotating electrical machine 100 according to the first embodiment. FIG. 2 is an enlarged view of the enlarged region R in FIG. As shown in FIGS. 1 and 2, a permanent magnet type rotating electrical machine 100 includes a stator 10 having an armature winding 20 on a stator core 11, and a rotor 30 that is rotatably arranged in the stator 10. Prepare. The stator core 11 has a configuration in which electromagnetic steel plates are laminated (in the depth direction toward FIG. 1). On the inner peripheral side of the stator core 11, a slot 40 for accommodating the armature winding 20 and a tooth 50 sandwiched between the slots 40 are provided.

回転子30は、ティース50の内周側の先端であるティース先端部51との間隙(エアギャップ)を介して固定子10の内側に配置される(図2参照)。回転子30は、回転軸(図示しない)と回転軸受部32を介して接合され、回転軸が中心120を中心に回転することにより、固定子10内で回転する。回転子30は、電磁鋼板を積層(図1に向かった奥行き方向に)した回転子鉄心31に複数の永久磁石60を埋設した構成である。   The rotor 30 is disposed inside the stator 10 through a gap (air gap) with a tooth tip 51 that is a tip on the inner peripheral side of the tooth 50 (see FIG. 2). The rotor 30 is joined to a rotary shaft (not shown) via a rotary bearing portion 32, and rotates in the stator 10 as the rotary shaft rotates around the center 120. The rotor 30 has a configuration in which a plurality of permanent magnets 60 are embedded in a rotor core 31 in which electromagnetic steel plates are laminated (in the depth direction toward FIG. 1).

回転子30の回転子鉄心31には、中心120に対する円周方向に磁化容易方向と磁化困難方向とが交互に形成されている。さらに、回転子30は、外周面に磁気的な凹凸を形成するために、永久磁石埋め込み穴61が磁化容易方向に沿って形成され、永久磁石60が永久磁石埋め込み穴61に埋め込まれて接着剤などにより固定されている。これにより、回転子30では、永久磁石60が磁気的な凸部を複数形成するように回転子鉄心31内部に配置され、具体的には回転子30において8極の磁極部80を構成する。   In the rotor core 31 of the rotor 30, easy magnetization directions and difficult magnetization directions are alternately formed in the circumferential direction with respect to the center 120. Further, in order to form magnetic irregularities on the outer peripheral surface of the rotor 30, permanent magnet embedded holes 61 are formed along the easy magnetization direction, and the permanent magnet 60 is embedded in the permanent magnet embedded holes 61. It is fixed by. Thereby, in the rotor 30, the permanent magnet 60 is arranged inside the rotor core 31 so as to form a plurality of magnetic convex portions, and specifically, the rotor 30 constitutes an 8-pole magnetic pole portion 80.

この回転子30の外周において、中心120から磁極部80の中心位置を通る方向がd軸方向、磁極部80間の中心位置を通る方向がq軸方向となる。なお、図示例では、拡大領域Rで拡大した1極分の磁極部80について、直線121を中心120からd軸方向に沿った直線、直線122を中心120からq軸方向に沿った直線としている。   On the outer periphery of the rotor 30, the direction passing from the center 120 to the center position of the magnetic pole part 80 is the d-axis direction, and the direction passing the center position between the magnetic pole parts 80 is the q-axis direction. In the illustrated example, regarding the magnetic pole portion 80 for one pole expanded in the expansion region R, the straight line 121 is a straight line extending from the center 120 along the d-axis direction, and the straight line 122 is a straight line extending from the center 120 along the q-axis direction. .

図2に示すように、回転子鉄心31の外周には、所定の厚みで磁気特性を劣化させた磁気特性劣化部70が形成されている。この磁気特性劣化部70は、回転子鉄心31の外周から中心120の方向、又は回転子鉄心31の正面方向(図1に向かった奥行き方向)に向けた機械的圧力の印加、局部加熱又はレーザーピーニング等による応力で形成される。なお、機械的圧力を印加して形成する場合は、印加後に略真円となるように予め弾性変形分の形状が考慮されているものとする。また、回転子鉄心31の正面方向に向けた機械的圧力の印加、局部加熱又はレーザーピーニング等による応力で磁気特性劣化部70を形成する場合は、回転子鉄心31の外周面に接することなく、回転子鉄心31の内部に形成可能である。   As shown in FIG. 2, a magnetic property deterioration portion 70 is formed on the outer periphery of the rotor core 31. The magnetic property deterioration portion 70 has a magnetic property deteriorated with a predetermined thickness. The magnetic property deterioration unit 70 is configured to apply a mechanical pressure in the direction from the outer periphery of the rotor core 31 to the center 120 or the front direction of the rotor core 31 (the depth direction toward FIG. 1), local heating, or laser. It is formed by stress due to peening or the like. In addition, when forming by applying a mechanical pressure, the shape for an elastic deformation shall be considered beforehand so that it may become a substantially perfect circle after application. Moreover, when forming the magnetic property degradation part 70 by the stress by application of the mechanical pressure toward the front direction of the rotor core 31, local heating or laser peening, etc., without contacting the outer peripheral surface of the rotor core 31, It can be formed inside the rotor core 31.

具体的には、磁気特性劣化部70は、磁極部80の中心位置を通る直線121に近づくほど薄く、磁極部80間の中心位置を通る直線122に近づくほど厚く形成される。なお、磁気特性劣化部70は、回転子鉄心31の外周の全周にわたって形成されてもよい。回転子鉄心31の外周の全周にわたって形成される場合も、磁極部80の中心位置を通る直線121に近づくほど薄く、磁極部80間の中心位置を通る直線122に近づくほど厚く形成されることが好ましい。このように、磁気特性劣化部70を磁極部80の中心位置を通る直線121に近づくほど薄く、磁極部80間の中心位置を通る直線122に近づくほど厚く形成することで、磁気特性劣化部70によるトルク、出力特性の低下を抑えることができる。   Specifically, the magnetic property degradation portion 70 is formed so as to be thinner as it approaches the straight line 121 passing through the center position of the magnetic pole portion 80 and thicker as it approaches the straight line 122 passing through the center position between the magnetic pole portions 80. Note that the magnetic property deterioration portion 70 may be formed over the entire outer periphery of the rotor core 31. Even when it is formed over the entire outer periphery of the rotor core 31, it is formed so that it is thinner as it approaches the straight line 121 passing through the center position of the magnetic pole part 80 and thicker as it approaches the straight line 122 passing through the center position between the magnetic pole parts 80. Is preferred. As described above, the magnetic property deterioration portion 70 is formed so as to be thinner as it approaches the straight line 121 passing through the center position of the magnetic pole portion 80 and thicker as it approaches the straight line 122 passing through the center position between the magnetic pole portions 80. It is possible to suppress a decrease in torque and output characteristics due to the above.

また、図2に示すように、磁気特性劣化部70は、回転子鉄心31の外周部分において、約8割程度を覆う部分に形成されてもよい。具体的には、磁気特性劣化部70において、d軸側の端から中心120に向かう直線を直線123、q軸側の端から中心120に向かう直線を直線124とした場合、直線121から直線122に至る範囲130に対し、約8割程度の範囲131を覆う部分に形成されてもよい。すなわち、磁気特性劣化部70は、極弧率が8割程度の外周面に形成されてもよい。なお、磁気特性劣化部70は、回転子鉄心31の外周部分において、磁極部80の中心位置を通る直線121を中心に所定幅を除いた範囲に形成されることが好ましい。このように、磁極部80の中心位置を通る直線121を中心に所定幅を除いた範囲に磁気特性劣化部70を形成することで、磁気特性劣化部70によるトルク、出力特性の低下を抑えることができる。   In addition, as shown in FIG. 2, the magnetic property deterioration portion 70 may be formed in a portion covering about 80% in the outer peripheral portion of the rotor core 31. Specifically, in the magnetic property degradation unit 70, when the straight line from the end on the d-axis side to the center 120 is the straight line 123 and the straight line from the end on the q-axis side to the center 120 is the straight line 124, the straight line 121 to the straight line 122 It may be formed in a portion covering about 80% of the range 131 with respect to the range 130 leading to. That is, the magnetic property deterioration part 70 may be formed on the outer peripheral surface having a polar arc rate of about 80%. In addition, it is preferable that the magnetic characteristic deterioration portion 70 is formed in a range excluding a predetermined width around the straight line 121 passing through the center position of the magnetic pole portion 80 in the outer peripheral portion of the rotor core 31. As described above, by forming the magnetic characteristic deterioration portion 70 in a range excluding the predetermined width around the straight line 121 passing through the center position of the magnetic pole portion 80, it is possible to suppress a decrease in torque and output characteristics due to the magnetic characteristic deterioration portion 70. Can do.

ここで、磁気特性劣化部70の磁気特性について説明する。図3、図4は、磁気特性の劣化を示すグラフである。図5は、磁気特性の劣化の有無におけるコギングトルクを例示するグラフである。   Here, the magnetic characteristics of the magnetic characteristic deterioration unit 70 will be described. 3 and 4 are graphs showing the deterioration of the magnetic characteristics. FIG. 5 is a graph illustrating the cogging torque with and without the deterioration of the magnetic characteristics.

図3、図4において、グラフ曲線G1は、応力による磁気特性の劣化がない回転子鉄心31の磁界の強さに対する磁束密度の関係を示している。グラフ曲線G2は、応力により磁気特性を劣化させた磁気特性劣化部70の磁界の強さに対する磁束密度の関係を示している。なお、グラフ曲線G2a…G2nは、加える応力を段階的に調整して得られたグラフである。なお、グラフ曲線G2aは磁気特性の劣化を最小とし、グラフ曲線G2nは磁気特性の劣化を最大としている。   3 and 4, a graph curve G1 indicates the relationship of the magnetic flux density to the magnetic field strength of the rotor core 31 in which the magnetic characteristics are not deteriorated due to stress. A graph curve G2 shows the relationship between the magnetic flux density and the magnetic field strength of the magnetic characteristic deterioration unit 70 whose magnetic characteristics are deteriorated by stress. The graph curves G2a ... G2n are graphs obtained by adjusting the applied stress in stages. The graph curve G2a minimizes the deterioration of magnetic characteristics, and the graph curve G2n maximizes the deterioration of magnetic characteristics.

図3のグラフ曲線G1、G2を比較しても明らかなように、磁気特性劣化部70は、磁界の強さに対する、磁束密度の変化が小さく、低磁束密度の範囲での磁気特性が劣化している。そして、磁界の強さが増すに従って緩やかに磁束密度を増していき、磁束飽和に至る。   As is clear from comparison between the graph curves G1 and G2 in FIG. 3, the magnetic characteristic deterioration unit 70 has a small change in magnetic flux density with respect to the magnetic field strength, and the magnetic characteristic in the range of low magnetic flux density deteriorates. ing. Then, as the strength of the magnetic field increases, the magnetic flux density is gradually increased to reach magnetic flux saturation.

より具体的には、図4に示すように、磁気特性劣化部70では、0〜1.5T近傍までの低磁束密度の範囲で、回転子鉄心31の磁気特性よりも劣化している。また、1.7T程度の磁束飽和以後は、磁気特性を劣化させていない回転子鉄心31と略同じ磁気特性となっている。   More specifically, as shown in FIG. 4, the magnetic property deterioration unit 70 is deteriorated more than the magnetic properties of the rotor core 31 in a low magnetic flux density range from 0 to 1.5 T. Further, after magnetic flux saturation of about 1.7 T, the magnetic characteristics are substantially the same as those of the rotor core 31 that has not deteriorated the magnetic characteristics.

このように、回転子鉄心31の外周部分において、低磁束密度の範囲、すなわち高速軽負荷時、または無負荷運転時に磁気特性が劣化する磁気特性劣化部70を有することから、永久磁石式回転電機100では、図5に示すように、コギングトルク低下の効果を得ることができる。また、高トルク運転(低速高負荷時)の高磁束密度時には、磁気特性劣化部70の磁気特性が回転子鉄心31の磁気特性と略同じになることから、トルクの低下を防止できる。   As described above, since the outer peripheral portion of the rotor core 31 has the magnetic characteristic deterioration portion 70 in which the magnetic characteristic deteriorates during a low magnetic flux density range, that is, at high speed and light load or during no-load operation, the permanent magnet type rotating electrical machine At 100, as shown in FIG. 5, the effect of lowering the cogging torque can be obtained. Further, at the time of high magnetic flux density during high torque operation (at low speed and high load), the magnetic characteristic of the magnetic characteristic deterioration unit 70 is substantially the same as the magnetic characteristic of the rotor core 31, so that a reduction in torque can be prevented.

[第2の実施形態]
次に、第2の実施形態について説明する。上述した第1の実施形態では回転子鉄心31の外周部分に磁気特性を劣化させた磁気特性劣化部70を形成する構成を例示したが、第2の実施形態では、ティースのティース先端部に磁気特性を劣化させた磁気特性劣化部を形成した点が第1の実施形態と異なる。
[Second Embodiment]
Next, a second embodiment will be described. In the first embodiment described above, the configuration in which the magnetic characteristic deterioration portion 70 having a deteriorated magnetic characteristic is formed in the outer peripheral portion of the rotor core 31 is exemplified. However, in the second embodiment, a magnetic force is applied to the tooth tip portion of the tooth. The difference from the first embodiment is that a magnetic characteristic deterioration portion having deteriorated characteristics is formed.

図6は、第2の実施形態にかかる拡大領域Rの拡大図である。図6に示すように、固定子10aのティース50aにおいて回転子30aに面するティース先端部51には、所定の厚みで磁気特性を劣化させた磁気特性劣化部52が形成されている。この磁気特性劣化部52は、固定子10aの内周側から外側に向けた機械的圧力の印加、局部加熱又はレーザーピーニングによる応力で形成される。なお、磁気特性劣化部52の磁気特性については、磁気特性劣化部70と同様である。   FIG. 6 is an enlarged view of the enlarged region R according to the second embodiment. As shown in FIG. 6, in the teeth 50a of the stator 10a, a tooth tip 51 that faces the rotor 30a is formed with a magnetic property deterioration portion 52 that has deteriorated magnetic properties with a predetermined thickness. The magnetic characteristic deterioration portion 52 is formed by application of mechanical pressure from the inner peripheral side to the outer side of the stator 10a, local heating, or stress due to laser peening. The magnetic characteristics of the magnetic characteristic deterioration unit 52 are the same as those of the magnetic characteristic deterioration unit 70.

したがって、低磁束密度の範囲、すなわち高速軽負荷時、または無負荷運転時に磁気特性が劣化する磁気特性劣化部52をティース50aのティース先端部51に有することから、永久磁石式回転電機100では、図5に示すように、コギングトルク低下の効果を得ることができる。また、高トルク運転(低速高負荷時)の高磁束密度時には、磁気特性劣化部52の磁気特性が固定子10aの磁気特性と略同じになることから、トルクの低下を防止できる。   Therefore, the permanent magnet type rotating electrical machine 100 has a magnetic property deterioration portion 52 in which the magnetic property deteriorates in a low magnetic flux density range, that is, at high speed and light load or no load operation, in the tooth tip portion 51 of the tooth 50a. As shown in FIG. 5, the effect of lowering the cogging torque can be obtained. Further, at the time of high magnetic flux density during high torque operation (at low speed and high load), the magnetic characteristic of the magnetic characteristic deterioration unit 52 is substantially the same as the magnetic characteristic of the stator 10a, so that a reduction in torque can be prevented.

図7は、第2の実施形態の変形例にかかる拡大領域Rの拡大図である。図7に示すように、固定子10bのティース50bにおいて回転子30aに面するティース先端部51には、ティース先端部51の中心位置に近づくほど薄く、ティース先端部51の両端に近づくほど厚く磁気特性劣化部52aが形成される。また、図示例に示すように、磁気特性劣化部52aは、ティース先端部51の中心位置を覆わず、ティース先端部51の両端に形成されることがより好ましい。このように磁気特性劣化部52aを形成することで、磁気特性劣化部52aによるトルク、出力特性の低下を抑えることができる。上述した第2の実施形態は、第1の実施形態と別に実施してもよいし、第1の実施形態と組み合わせて実施してもよい。   FIG. 7 is an enlarged view of an enlarged region R according to a modified example of the second embodiment. As shown in FIG. 7, the tooth tip 51 facing the rotor 30 a in the teeth 50 b of the stator 10 b is thinner as it approaches the center position of the tooth tip 51 and thicker as it approaches both ends of the tooth tip 51. A characteristic deterioration portion 52a is formed. Further, as shown in the illustrated example, it is more preferable that the magnetic property deterioration portions 52 a are formed at both ends of the tooth tip portion 51 without covering the center position of the tooth tip portion 51. By forming the magnetic characteristic deterioration part 52a in this way, it is possible to suppress a decrease in torque and output characteristics due to the magnetic characteristic deterioration part 52a. The second embodiment described above may be implemented separately from the first embodiment, or may be implemented in combination with the first embodiment.

なお、本発明は、上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化することができる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合わせにより、種々の発明を形成することができる。例えば、実施形態に示される全構成要素からいくつかの構成要素を削除してもよい。さらに、異なる実施形態にわたる構成要素を適宜組み合わせても良い。   Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be appropriately combined.

100…永久磁石式回転電機、10、10a、10b…固定子、11…固定子鉄心、20…電機子巻線、30、30a…回転子、31…回転子鉄心、32…回転軸受部、40…スロット、50、50a、50b…ティース、51…ティース先端部、52、52a、70…磁気特性劣化部、60…永久磁石、61…永久磁石埋め込み穴、80…磁極部、120…中心、121〜124…直線、130、131…範囲、G1、G2、G2a〜G2n…グラフ曲線、R…拡大領域   DESCRIPTION OF SYMBOLS 100 ... Permanent magnet type rotary electric machine 10, 10a, 10b ... Stator, 11 ... Stator iron core, 20 ... Armature winding, 30, 30a ... Rotor, 31 ... Rotor iron core, 32 ... Rotary bearing part, 40 ... Slot, 50, 50a, 50b ... Teeth, 51 ... Teeth tip, 52, 52a, 70 ... Magnetic property deterioration part, 60 ... Permanent magnet, 61 ... Permanent magnet embedding hole, 80 ... Magnetic pole part, 120 ... Center, 121 -124 ... straight line, 130, 131 ... range, G1, G2, G2a-G2n ... graph curve, R ... enlarged region

Claims (11)

固定子鉄心に電機子巻線を有する固定子と、
前記固定子内に回転可能に配置される回転子鉄心に永久磁石を埋設し、前記回転子鉄心の外周に複数の磁極部を有する回転子と、
前記回転子鉄心の外周の全周又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部と、
を備える永久磁石式回転電機。
A stator having armature windings on the stator core;
A rotor having a permanent magnet embedded in a rotor core disposed rotatably in the stator, and having a plurality of magnetic pole portions on the outer periphery of the rotor core;
A magnetically deteriorated portion that has deteriorated magnetic properties at a predetermined thickness in the entire circumference or part of the outer periphery of the rotor core;
A permanent magnet type rotating electrical machine.
前記磁気劣化部は、前記磁極部の中心位置に近づくほど薄く、前記磁極部間の中心位置に近づくほど厚く形成される、
請求項1に記載の永久磁石式回転電機。
The magnetic degradation part is formed so as to be thinner as it approaches the center position of the magnetic pole part, and thicker as it approaches the center position between the magnetic pole parts.
The permanent magnet type rotating electrical machine according to claim 1.
前記磁気劣化部は、前記回転子鉄心の外周において前記複数の磁極部の中心位置から所定幅を除いた範囲に形成される、
請求項1又は2に記載の永久磁石式回転電機。
The magnetic deterioration portion is formed in a range excluding a predetermined width from the center position of the plurality of magnetic pole portions on the outer periphery of the rotor core.
The permanent magnet type rotating electrical machine according to claim 1 or 2.
前記磁気劣化部の磁気特性は、0〜1.5T近傍までの低磁束密度の範囲で、前記回転子鉄心の磁気特性よりも劣化している、
請求項1乃至3のいずれか一項に記載の永久磁石式回転電機。
The magnetic characteristics of the magnetically deteriorated portion are inferior to the magnetic characteristics of the rotor core in the range of low magnetic flux density from 0 to 1.5 T.
The permanent magnet type rotating electrical machine according to any one of claims 1 to 3.
電機子巻線を収納する固定子スロットに挟まれた固定子ティースを固定子鉄心の内周に有する固定子と、
前記固定子内に回転可能に配置される回転子鉄心に永久磁石を埋設し、前記回転子鉄心の外周に複数の磁極部を有する回転子と、
前記固定子ティースの前記回転子に面する先端部の全部又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部と、
を備える永久磁石式回転電機。
A stator having stator teeth sandwiched between stator slots for accommodating armature windings on the inner periphery of the stator core;
A rotor having a permanent magnet embedded in a rotor core disposed rotatably in the stator, and having a plurality of magnetic pole portions on the outer periphery of the rotor core;
A magnetically deteriorated part having deteriorated magnetic properties with a predetermined thickness at all or a part of a tip part facing the rotor of the stator teeth;
A permanent magnet type rotating electrical machine.
前記磁気劣化部は、前記先端部の中心位置に近づくほど薄く、前記先端部の両端に近づくほど厚く形成される、
請求項5に記載の永久磁石式回転電機。
The magnetic degradation part is formed so as to be thinner as it approaches the center position of the tip part, and thicker as it approaches both ends of the tip part.
The permanent magnet type rotating electrical machine according to claim 5.
前記磁気劣化部は、前記先端部の両端に形成される、
請求項5又は6に記載の永久磁石式回転電機。
The magnetic degradation part is formed at both ends of the tip part,
The permanent magnet type rotating electrical machine according to claim 5 or 6.
前記磁気劣化部の磁気特性は、0〜1.5T近傍までの低磁束密度の範囲で、前記固定子鉄心の磁気特性よりも劣化している、
請求項5乃至7のいずれか一項に記載の永久磁石式回転電機。
The magnetic characteristics of the magnetically deteriorated portion are inferior to the magnetic characteristics of the stator core in the range of low magnetic flux density from 0 to 1.5 T.
The permanent magnet type rotating electrical machine according to any one of claims 5 to 7.
前記磁気劣化部は、機械的圧力の印加、局部加熱、レーザーピーニングによる応力で形成される、
請求項1乃至8のいずれか一項に記載の永久磁石式回転電機。
The magnetic degradation part is formed by application of mechanical pressure, local heating, and stress due to laser peening.
The permanent magnet type rotating electrical machine according to any one of claims 1 to 8.
固定子内に回転可能に配置される回転子鉄心に永久磁石を埋設し、前記回転子鉄心の外周に複数の磁極部を有し、前記回転子鉄心の外周の全周又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部を備える、
永久磁石式回転電機の回転子。
A permanent magnet is embedded in a rotor core that is rotatably arranged in the stator, and has a plurality of magnetic pole portions on the outer periphery of the rotor core. Provided with a magnetically deteriorated part that deteriorates magnetic properties with thickness,
A rotor of a permanent magnet type rotating electrical machine.
電機子巻線を収納する固定子スロットに挟まれた固定子ティースを固定子鉄心の内周に有し、前記固定子ティースの先端部の全部又は一部において所定の厚みで磁気特性を劣化させた磁気劣化部を備える、
回転電機の固定子。
A stator tooth sandwiched between stator slots for accommodating armature windings is provided on the inner periphery of the stator core, and the magnetic properties are deteriorated at a predetermined thickness at all or part of the tip of the stator tooth. With a magnetically degraded part
Stator for rotating electric machine.
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