JP5679695B2 - Permanent magnet rotating electric machine - Google Patents

Permanent magnet rotating electric machine Download PDF

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JP5679695B2
JP5679695B2 JP2010110369A JP2010110369A JP5679695B2 JP 5679695 B2 JP5679695 B2 JP 5679695B2 JP 2010110369 A JP2010110369 A JP 2010110369A JP 2010110369 A JP2010110369 A JP 2010110369A JP 5679695 B2 JP5679695 B2 JP 5679695B2
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permanent magnet
rotating electrical
rotor
electrical machine
opening
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JP2011239609A (en
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則雄 高橋
則雄 高橋
徳増　正
正 徳増
堺　和人
和人 堺
豊 橋場
豊 橋場
新　政憲
政憲 新
佑将 松岡
佑将 松岡
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Toshiba Corp
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本発明は、回転電機のトルク、出力特性を低下させることなく、高速回転（高周波数領域）における鉄損を抑制することにより、高効率で、回転電機の温度上昇を低減し、且つ回転子鉄心の強度を確保した永久磁石式回転電機に関し、特に車両に搭載される永久磁石式回転電機に関する。   The present invention suppresses the iron loss in high-speed rotation (high frequency region) without reducing the torque and output characteristics of the rotating electrical machine, thereby reducing the temperature rise of the rotating electrical machine with high efficiency and the rotor core. In particular, the present invention relates to a permanent magnet type rotating electrical machine mounted on a vehicle.

近年、永久磁石の目覚しい研究開発により、高磁気エネルギー積の永久磁石が開発され、回転電機の小型・高出力化が進められている。特にハイブリッド自動車向けのような車両用を用途とする回転電機では、排出ガスの抑制、燃費向上のため、高効率化を強く求められている。特に、回転電機をハイブリッド自動車に搭載する場合には、搭載スペースが小さく、その限られた空間の中で、高トルク、高出力化を要求される。この要求に応えるために、これまでになく高エネルギー密度の回転電機とする必要がある。しかしながら、高エネルギー密度の回転電機では、固定子と回転子との磁気変動に起因するコギングトルクが生じ、スムーズな回転を妨げるという問題点がある。そこで、図９に示すように、回転子鉄心表面、且つ磁極中心に対応する位置に溝を配置することで、コギングトルクを抑制する方法が知られている（例えば、特許文献１参照）。   In recent years, permanent magnets with a high magnetic energy product have been developed by remarkable research and development of permanent magnets, and miniaturization and high output of rotating electric machines are being promoted. In particular, a rotating electrical machine that is used for a vehicle such as a hybrid vehicle is strongly required to be highly efficient in order to suppress exhaust gas and improve fuel efficiency. In particular, when a rotating electrical machine is mounted on a hybrid vehicle, the mounting space is small, and high torque and high output are required in the limited space. In order to meet this demand, it is necessary to use a rotating electrical machine with a higher energy density than ever before. However, in a rotating machine with high energy density, there is a problem that cogging torque resulting from magnetic fluctuations between the stator and the rotor is generated, preventing smooth rotation. Therefore, as shown in FIG. 9, there is known a method of suppressing cogging torque by disposing a groove at a position corresponding to the surface of the rotor core and the center of the magnetic pole (see, for example, Patent Document 1).

それだけでなく、高エネルギー密度の回転電機では、電磁加振力も増加し、振動、騒音の増加が問題となる。特に、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。そこで、図１０に示すように、回転子の外周に溝を形成し、外周表面から深さが最も深い底点と回転子中心とを結ぶ直線を磁極の中心に対し４０°以上４４°未満の電気角とすることにより、トルクリプルを低下させ、回転電機の振動、騒音を抑制し、且つ鉄損を低減する回転電機が知られている（例えば、特許文献２参照）。   In addition, in a high energy density rotating electrical machine, the electromagnetic excitation force also increases, and the increase in vibration and noise becomes a problem. Particularly for hybrid vehicles, quietness in the passenger compartment and noise reduction outside the vehicle are strictly required. Therefore, as shown in FIG. 10, a groove is formed on the outer periphery of the rotor, and a straight line connecting the bottom point having the deepest depth from the outer peripheral surface and the center of the rotor is not less than 40 ° and less than 44 ° with respect to the center of the magnetic pole. There is known a rotating electrical machine that reduces torque ripple, suppresses vibration and noise of the rotating electrical machine, and reduces iron loss by using an electrical angle (see, for example, Patent Document 2).

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

また、近年では、ハイブリッド自動車に加え、回転電機のみで駆動する電気自動車（ＥＶ）の開発、普及が進められており、この場合は、これまではエンジンとの併用で中低速時の駆動を主に担っていた回転電機が、高速域を含む全領域を駆動する必要がある。更には小型、高出力化による高速回転が必要となっている。高速回転（高周波数領域）の運転では、回転電機の損失は、鉄損が大幅に増加するため、損失の増加、並びに発熱により、回転電機温度が上昇し、連続運転が困難となる問題が生じている。   In recent years, in addition to hybrid vehicles, electric vehicles (EVs) driven only by rotating electrical machines have been developed and spread. In this case, driving at medium and low speeds has been mainly used in combination with engines. It is necessary for the rotating electrical machine that has been responsible for driving the entire region including the high speed region. Furthermore, high-speed rotation is required due to the small size and high output. In high-speed rotation (high frequency range) operation, the loss of the rotating electrical machine greatly increases the iron loss. Therefore, the increase in the loss and the heat generation cause a problem that the temperature of the rotating electrical machine rises and makes continuous operation difficult. ing.

しかしながら、特許文献１の発明では、コギングトルクを低減することは可能であるが、更なる高速回転（高周波数領域）では、回転子の磁極中央部に配置する溝だけでは、十分に鉄損を抑制することができず、損失の増大、回転電機の温度上昇という問題が発生する。加えて、磁束が集中する回転子の磁極中央部に溝を配置するため、磁束の流れを阻害するため、トルクが大幅に低下する。従って、低速運転時に必要なトルクを十分に発生することが困難となる。同様に、特許文献２における外周の溝だけでは、十分な鉄損低減の効果を得ることが不可能である。   However, in the invention of Patent Document 1, it is possible to reduce the cogging torque, but in the case of further high-speed rotation (high frequency region), sufficient iron loss can be achieved with only the groove arranged at the center of the magnetic pole of the rotor. It cannot be suppressed, and problems such as an increase in loss and a rise in temperature of the rotating electrical machine occur. In addition, since the groove is disposed in the central part of the magnetic pole of the rotor where the magnetic flux is concentrated, the flow of magnetic flux is obstructed, and the torque is greatly reduced. Therefore, it is difficult to generate sufficient torque necessary for low speed operation. Similarly, it is impossible to obtain a sufficient iron loss reduction effect using only the outer peripheral grooves in Patent Document 2.

そこで、本発明は前記のような従来技術の問題点を解決するために提案されたものであって、回転電機のトルク、出力特性を低下させることなく、高速回転（高周波数領域）における鉄損を抑制し、高効率で、回転電機の温度上昇を低減し、且つ回転子鉄心の強度を確保できる高信頼性の永久磁石式回転電機を提供することを目的とする。   Therefore, the present invention has been proposed in order to solve the above-described problems of the prior art, and the iron loss at high speed rotation (high frequency region) without reducing the torque and output characteristics of the rotating electrical machine. An object of the present invention is to provide a highly reliable permanent magnet type rotating electrical machine that can suppress the temperature rise, reduce the temperature rise of the rotating electrical machine, and secure the strength of the rotor core.

前記の目的を達成するために、本発明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、前記複数の永久磁石を外周部に内蔵した回転子とを備え、前記固定子鉄心の内周には、電機子巻線の巻回用のスロットに挟まれた固定子ティースが設けられ、前記回転子鉄心の外周部分に、２つの溝からなる開口部を複数配置し、前記開口部における１つの溝と他方の溝との間隔が、前記固定子ティース先端部の一端と他端との間隔で配置され、前記開放部の間隔をスロットピッチ角度の間隔で配置することを特徴とする。
In order to achieve the above object, a permanent magnet type rotating electrical machine of the present invention includes a stator having armature windings in a stator core, and a rotor having the plurality of permanent magnets incorporated in an outer peripheral portion thereof. Stator teeth sandwiched between slots for winding the armature winding are provided on the inner periphery of the stator core, and a plurality of openings made of two grooves are disposed on the outer periphery of the rotor core. In addition, the gap between one groove and the other groove in the opening is arranged at a distance between one end and the other end of the stator tooth tip, and the opening is arranged at a slot pitch angle. It is characterized by that.

なお、高速運転時の鉄損を低減し、回転電機の温度上昇を抑制、並びに回転遠心力による応力を低減するために、
（１）開口部を回転子鉄心の外周部分のｄ軸の周辺領域に配置したり、
（２）回転子鉄心の外周部分のｄ軸の周辺領域の端部に配置する開口部の幅を、ｄ軸の周辺領域の中心部に配置する開口部の幅よりも拡大したり、
（３）回転子鉄心の外周部分のｄ軸の周辺領域の最端部に配置する開口部を、隣接する開口部と結合することで、横長にしたり、
（４）開口部を回転子鉄心の外周部分に設けられた磁気障壁である空隙としたりすることも本発明の一態様である。
In order to reduce the iron loss during high-speed operation, suppress the temperature rise of the rotating electrical machine, and reduce the stress caused by the rotational centrifugal force,
( 1 ) The opening is arranged in the peripheral area of the d-axis of the outer peripheral portion of the rotor core,
( 2 ) The width of the opening disposed at the end of the peripheral region of the d-axis of the outer peripheral portion of the rotor core is made larger than the width of the opening disposed at the central portion of the peripheral region of the d-axis,
( 3 ) By connecting an opening disposed at the outermost end of the peripheral area of the d-axis of the outer peripheral part of the rotor core with an adjacent opening,
( 4 ) It is also one aspect of the present invention that the opening is a gap that is a magnetic barrier provided in the outer peripheral portion of the rotor core.

以上のような構成を有する本発明によれば、高速運転時の鉄損を低減し、回転電機の温度上昇を抑制することができる。また、開口部を回転子の外周部分のｄ軸の周辺領域に配置することにより、回転遠心力による応力を低減でき、回転電機の効率、信頼性が向上する。   According to the present invention having the above-described configuration, it is possible to reduce the iron loss during high-speed operation and suppress the temperature rise of the rotating electrical machine. Further, by arranging the opening in the peripheral region of the d-axis on the outer peripheral portion of the rotor, the stress due to the rotational centrifugal force can be reduced, and the efficiency and reliability of the rotating electrical machine are improved.

実施例１における永久磁石式回転電機の回転子径方向断面図Sectional view in the rotor radial direction of the permanent magnet type rotating electric machine in Embodiment 1 実施例１における永久磁石式回転電機の回転子径方向断面拡大図The rotor radial direction cross-section enlarged view of the permanent magnet type rotary electric machine in Example 1 実施例１における溝の有無の効果を示すグラフThe graph which shows the effect of the presence or absence of the groove | channel in Example 1. 実施例２における永久磁石式回転電機の回転子径方向断面拡大図Rotor radial direction cross-sectional enlarged view of a permanent magnet type rotating electrical machine in Embodiment 2 実施例２における溝幅拡大の効果を示すグラフThe graph which shows the effect of the groove width expansion in Example 2 実施例３における永久磁石式回転電機の回転子径方向断面拡大図Rotor radial direction cross-sectional enlarged view of the permanent magnet type rotating electric machine in Example 3 実施例４における永久磁石式回転電機の回転子径方向断面拡大図Rotor radial direction cross-sectional enlarged view of a permanent magnet type rotating electrical machine in Example 4 実施例５における永久磁石式回転電機の回転子径方向断面拡大図Rotor radial direction cross-sectional enlarged view of a permanent magnet type rotating electrical machine in Example 5 従来技術における回転子の径方向断面図Radial sectional view of the rotor in the prior art 従来技術におけるの回転子の径方向断面拡大図Radial cross-sectional enlarged view of the rotor in the prior art

以下、本発明に係る永久磁石式回転電機の実施例について、図面を参照して説明する。本実施例の回転電機は８極の場合で説明しており、他の極数でも同様に適用できる。なお各実施例において、同一の構成には同一の符号を付し、重複する説明は省略する。   Embodiments of a permanent magnet type rotating electrical machine according to the present invention will be described below with reference to the drawings. The rotary electric machine of the present embodiment is described in the case of 8 poles, and can be similarly applied to other pole numbers. Note that, in each embodiment, the same reference numerals are given to the same components, and duplicate descriptions are omitted.

［１−１．構成］
図１，２を用いて本発明の実施例１を説明する。図１は本発明の実施例１における永久磁石式回転電機の展開断面図である。本実施例の回転電機は、図１に示すとおり、固定子１と電機子巻線２とを有し、その内側には回転子３が設けられている。この固定子１は、電磁鋼板の積層構成した固定子鉄心１ａからなり、その内周側には電機子巻線２を収容する固定子スロット４と、回転子３に面する固定子ティース５が具備されている。 [1-1. Constitution]
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a developed cross-sectional view of a permanent magnet type rotating electrical machine in Embodiment 1 of the present invention. As shown in FIG. 1, the rotating electrical machine of this embodiment has a stator 1 and an armature winding 2, and a rotor 3 is provided on the inside thereof. The stator 1 is composed of a stator core 1a formed by laminating electromagnetic steel sheets. A stator slot 4 for accommodating an armature winding 2 and a stator tooth 5 facing the rotor 3 are provided on the inner peripheral side thereof. It is equipped.

回転子３は、固定子ティース５との間隙（エアギャップ）を介して、固定子１の内側に配置され、回転子３と複数の永久磁石６とが備えられている。回転子３は、電磁鋼板の積層構造からなる回転子鉄心３ａからなり、回転軸を中心とした円周方向に磁化容易方向と磁化困難方向が交互に形成されている。また、回転子３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を磁化容易方向に形成され、永久磁石６がその永久磁石埋め込み穴に嵌め込まれ、接着剤などにより固定されている。すなわち、この永久磁石６は、磁気的な凸部を形成するような配置で、回転子鉄心３ａ内部に配置され、回転子３の磁極部８を構成する。この磁極部８の中心軸方向がｄ軸、磁極間の中心軸方向がｑ軸となる。   The rotor 3 is disposed inside the stator 1 through a gap (air gap) with the stator teeth 5, and includes the rotor 3 and a plurality of permanent magnets 6. The rotor 3 is composed of a rotor core 3a having a laminated structure of electromagnetic steel plates, and easy magnetization directions and difficult magnetization directions are alternately formed in a circumferential direction around the rotation axis. Further, in order to form magnetic irregularities on the outer peripheral surface of the rotor 3, a permanent magnet embedded hole is formed in the easy magnetization direction, and the permanent magnet 6 is fitted into the permanent magnet embedded hole and fixed by an adhesive or the like. ing. In other words, the permanent magnet 6 is arranged inside the rotor core 3 a so as to form a magnetic convex portion, and constitutes the magnetic pole portion 8 of the rotor 3. The central axis direction of the magnetic pole portion 8 is the d axis, and the central axis direction between the magnetic poles is the q axis.

図２は、本発明の実施例１における永久磁石６を略Ｖ字型に配置することにより、回転子の磁極部８を形成した場合の磁極部の１極分の拡大断面図である。図中に示すように、固定子鉄心１ａに設けたティース５は、一定のスロットピッチ角を保つような間隔で設けられている。このティース５の先端部のそれぞれの端をティース５の先端両端５ａ，５ｂとする。   FIG. 2 is an enlarged cross-sectional view of one pole of the magnetic pole portion when the magnetic pole portion 8 of the rotor is formed by arranging the permanent magnet 6 in the first embodiment of the present invention in a substantially V shape. As shown in the drawing, the teeth 5 provided on the stator core 1a are provided at intervals so as to maintain a constant slot pitch angle. The ends of the tip of the tooth 5 are referred to as both ends 5a and 5b of the tip of the tooth 5, respectively.

回転子鉄心１ａの外周部分には、ティース５の先端両端５ａと５ｂとの間隔と同じ間隔で、一組の開口部の溝７ａ，７ｂを配置する。すなわち、ティース先端両端５ａと向かい合う回転子鉄心１ａの外周部分には開口部である溝７ａを配置し、ティース先端両端５ｂと向かい合う外周部分には、開口部である溝７ｂを配置する。この溝７ａと溝７ｂは、２つで１つのペア溝を形成する。   On the outer peripheral portion of the rotor core 1a, a pair of opening grooves 7a and 7b are arranged at the same interval as the interval between the tip ends 5a and 5b of the tooth 5. That is, the groove 7a that is an opening is disposed in the outer peripheral portion of the rotor core 1a that faces both ends 5a of the teeth, and the groove 7b that is an opening is disposed in an outer periphery that faces both ends 5b of the teeth. Two grooves 7a and 7b form one pair groove.

また、開口部の溝７ａ，７ｂの寸法は、それぞれ同一とし、この開口部の溝７ａ，７ｂを設ける位置は、回転子鉄心１ａの外周部分のｄ軸の周辺領域のみとする。すなわち、回転子鉄心１ａの外周部分でも、ｑ軸の周辺領域には、開口部７を配置しない。このため、回転子のｄ軸の周辺領域の端部では、ペア溝の一方のみの溝７を配置する場合もある。   The dimensions of the grooves 7a and 7b in the opening are the same, and the positions where the grooves 7a and 7b in the opening are provided are only in the peripheral area of the d-axis in the outer peripheral portion of the rotor core 1a. That is, the opening 7 is not arranged in the peripheral region of the q axis even in the outer peripheral portion of the rotor core 1a. For this reason, only one of the paired grooves 7 may be arranged at the end of the peripheral region of the d-axis of the rotor.

このｄ軸及びｑ軸の周辺領域とは、隣り合うｄ軸とｑ軸との中心角の中央を通る軸により分割される領域であり、その軸で分割されるｄ軸側をｄ軸の周辺領域とし、ｑ軸側をｑ軸の周辺領域とする。   The peripheral area of the d-axis and the q-axis is an area divided by an axis passing through the center of the central angle between the adjacent d-axis and the q-axis, and the d-axis side divided by the axis is the periphery of the d-axis. The region is the q-axis side and the q-axis peripheral region.

［１−２．作用］
次に、前記のような構成を有する本実施形態の永久磁石式回転電機の作用について説明する。 [1-2. Action]
Next, the operation of the permanent magnet type rotating electrical machine of the present embodiment having the above-described configuration will be described.

図３は、本実施例の回転電機における回転子の外周部分の開口部の溝７の有無と各次数おける鉄損の関係を比較した図である。図３からは、回転基本周波数に対する５次、７次成分の鉄損は、外周部に開口部７を設けることにより低減されることがわかる。   FIG. 3 is a graph comparing the relationship between the presence or absence of the groove 7 in the opening in the outer peripheral portion of the rotor and the iron loss at each order in the rotating electrical machine of the present embodiment. From FIG. 3, it can be seen that the iron losses of the fifth and seventh components with respect to the rotation fundamental frequency are reduced by providing the opening 7 on the outer peripheral portion.

さらに、回転子ｄ軸の周辺領域の回転子外周部のみに溝を配置するため、ｑ軸部側の回転遠心力による応力が集中する外周部薄肉部、及びその付近に溝が配置されないため、外周部薄肉部の応力集中を抑制することができる。   Furthermore, since the groove is disposed only in the outer periphery of the rotor in the peripheral region of the rotor d-axis, the groove is not disposed in the outer peripheral thin portion where stress due to the rotational centrifugal force on the q-axis portion side is concentrated, and in the vicinity thereof, Stress concentration in the outer peripheral thin portion can be suppressed.

［１−３．効果］
以上のような構成を有する本発明の実施例１によれば、溝７を回転子の外周部分のｄ軸の周辺領域に配置することにより、回転子鉄心表面に溝を設けない場合や、従来技術である回転子鉄心表面で、且つ磁極中心に対応する位置に溝を配置する場合に比べて、高速運転時の鉄損を低減し、回転電機の温度上昇を抑制した永久磁石式回転電機を提供できる。 [1-3. effect]
According to the first embodiment of the present invention having the above-described configuration, by arranging the groove 7 in the peripheral region of the d-axis on the outer peripheral portion of the rotor, a case where no groove is provided on the surface of the rotor core, Compared to the case where a groove is arranged on the surface of the rotor core that is the technology and corresponding to the center of the magnetic pole, a permanent magnet type rotating electric machine that reduces iron loss during high-speed operation and suppresses the temperature rise of the rotating electric machine. Can be provided.

さらに、本発明の永久磁石式回転電機においては、回転子ｑ軸の周辺領域には、開口部である溝７を配置しないため、その領域への回転子の遠心力による応力を低減できるため、回転電機の効率、信頼性が向上する。   Furthermore, in the permanent magnet type rotating electrical machine of the present invention, since the groove 7 that is an opening is not disposed in the peripheral region of the rotor q-axis, the stress due to the centrifugal force of the rotor to the region can be reduced. The efficiency and reliability of rotating electrical machines are improved.

［２−１．構成］
本発明の実施例２は、実施例１の永久磁石式回転電機において、回転子のｄ軸の周辺領域の端部に配置する開口部７の幅を拡大したものである。図４を用いて本発明の実施例２を説明する。 [2-1. Constitution]
In the permanent magnet type rotating electrical machine of the first embodiment, the second embodiment of the present invention is obtained by enlarging the width of the opening 7 arranged at the end of the peripheral region of the d-axis of the rotor. A second embodiment of the present invention will be described with reference to FIG.

図４は本発明の実施例２における永久磁石式回転電機の展開断面図である。本実施例の回転電機は、図４に示すとおり、回転子鉄心１ａの外周部分のｄ軸の周辺領域の中心部に配置する開口部の溝７の幅をＷ１とし、ｄ軸の周辺領域の端部に配置する開口部の溝７の幅をＷ２とする。この溝の幅Ｗ１，Ｗ２は、Ｗ１よりもＷ２の幅の方が広くなるようにする。   FIG. 4 is a developed cross-sectional view of a permanent magnet type rotating electrical machine in Embodiment 2 of the present invention. As shown in FIG. 4, the rotating electrical machine of the present embodiment has a width of the groove 7 of the opening disposed at the center of the peripheral region of the d-axis in the outer peripheral portion of the rotor core 1 a as W <b> 1, The width of the groove 7 of the opening disposed at the end is defined as W2. The widths W1 and W2 of the grooves are set so that the width of W2 is wider than W1.

幅をＷ２とする溝７は、回転子鉄心１ａの外周部分のｄ軸の周辺領域の端部に配置されていれば良く、永久磁石６の配置や磁極の数によっては、ｄ軸の周辺領域の最端部の溝のみとすることも、端部に配置する複数の溝とすることもできる。また、ペア溝を構成する溝７ａと溝７ｂのうち、片方の溝のみの幅をＷ２としても良い。   The groove 7 having a width W2 only needs to be disposed at the end of the peripheral region of the d-axis of the outer peripheral portion of the rotor core 1a. Depending on the arrangement of the permanent magnets 6 and the number of magnetic poles, the peripheral region of the d-axis It is possible to use only the most end groove or a plurality of grooves arranged at the end. Moreover, it is good also considering the width | variety of only one groove | channel among the groove | channel 7a and the groove | channel 7b which comprise a pair groove | channel as W2.

［２−２．作用］
次に、前記のような構成を有する本実施形態の永久磁石式回転電機の作用について説明する。 [2-2. Action]
Next, the operation of the permanent magnet type rotating electrical machine of the present embodiment having the above-described configuration will be described.

図５は、本実施例の回転電機における回転子の外周部分の開口部の溝７の有無と各次数おける鉄損の関係を比較した図である。図５からは、回転基本周波数に対する５次、７次成分の鉄損は、ｄ軸の周辺領域の端部の溝７の幅を拡大した場合には、回転基本周波数に対する５次、７次成分の鉄損が低減されることが判る。   FIG. 5 is a diagram comparing the relationship between the presence or absence of the groove 7 in the opening in the outer peripheral portion of the rotor and the iron loss in each order in the rotating electrical machine of the present embodiment. From FIG. 5, the iron loss of the fifth-order and seventh-order components with respect to the rotation fundamental frequency is the fifth-order and seventh-order components with respect to the rotation fundamental frequency when the width of the groove 7 at the end of the peripheral region of the d-axis is enlarged. It can be seen that the iron loss is reduced.

［２−３．効果］
以上のような構成を有する本発明の実施例２によれば、前記実施例１の効果に加えて、回転子のｄ軸の周辺領域の端部に配置する開口部の溝７の幅を拡大することにより、実施例１以上に、高速運転時の鉄損を低減し、回転電機の温度上昇を抑制した永久磁石式回転電機を提供できる。 [2-3. effect]
According to the second embodiment of the present invention having the above-described configuration, in addition to the effects of the first embodiment, the width of the groove 7 of the opening disposed at the end of the peripheral region of the d-axis of the rotor is enlarged. By doing so, it is possible to provide a permanent magnet type rotating electrical machine that reduces the iron loss during high-speed operation and suppresses the temperature rise of the rotating electrical machine.

［３−１．構成］
本発明の実施例３は、実施例２の永久磁石式回転電機において、回転子のｄ軸の周辺領域の端部に配置する開口部の幅をＷ２とした近接する溝７同士を結合したものである。図６を用いて本発明の実施例３を説明する。 [3-1. Constitution]
Example 3 of the present invention is a permanent magnet type rotating electrical machine according to Example 2 in which adjacent grooves 7 having a width W2 of an opening arranged at the end of the peripheral region of the d-axis of the rotor are combined. It is. A third embodiment of the present invention will be described with reference to FIG.

図６は本発明の実施例３における永久磁石式回転電機の展開断面図である。本実施例の回転電機は、図６に示すとおり、回転子のｄ軸の周辺領域の再端部に配置された溝７と、その溝７に隣接する他のペア溝を構成する溝７を結合し、１つの横長の開口部７とする。   FIG. 6 is a developed cross-sectional view of a permanent magnet type rotating electrical machine in Embodiment 3 of the present invention. As shown in FIG. 6, the rotating electrical machine according to the present embodiment includes a groove 7 disposed at a re-end portion of the peripheral region of the d-axis of the rotor and a groove 7 constituting another pair groove adjacent to the groove 7. These are combined into one horizontally long opening 7.

回転子のｄ軸の周辺領域の再端部に配置された溝７と、結合する溝７は、回転子鉄心１ａの外周部分のｄ軸の周辺領域の端部に配置されていれば良く、再端部に配置された溝７に隣接する他のペア溝を構成する溝７のみでなくとも良い。すなわち、永久磁石６の配置や磁極の数によっては、再端部に配置された溝７と隣接する他のペア溝の両方と結合しても良い。   The groove 7 arranged at the re-end part of the peripheral area of the d-axis of the rotor and the groove 7 to be coupled may be arranged at the end of the peripheral area of the d-axis of the outer peripheral part of the rotor core 1a. It is not limited to the groove 7 constituting another pair groove adjacent to the groove 7 disposed at the re-end portion. That is, depending on the arrangement of the permanent magnet 6 and the number of magnetic poles, the permanent magnet 6 may be coupled to both the groove 7 disposed at the re-end portion and another adjacent pair groove.

［３−２．作用］
次に、前記のような構成を有する本実施形態の永久磁石式回転電機の作用について説明する。 [3-2. Action]
Next, the operation of the permanent magnet type rotating electrical machine of the present embodiment having the above-described configuration will be described.

回転子のｄ軸の周辺領域の端部に配置する開口部の溝７の幅を拡大することにより、実施例２と同様に、鉄損が低減され、回転子より固定子ティース先端部に流れる高調波磁束が更に抑制される。   By enlarging the width of the groove 7 of the opening disposed at the end of the peripheral region of the d-axis of the rotor, the iron loss is reduced and flows from the rotor to the tip of the stator teeth as in the second embodiment. Harmonic magnetic flux is further suppressed.

［３−３．効果］
以上のような構成を有する本発明の実施例３によれば、前記実施例１の効果に加えて、回転子のｄ軸の周辺領域の端部に配置する開口部の溝７を結合、横長にすることにより、実施例１の構成以上に、高速運転時の鉄損を低減し、回転電機の温度上昇を抑制した永久磁石式回転電機を提供できる。さらに、本実施例でも、回転子のｑ軸上の外周部には溝を配置せず、回転子ｄ軸の周辺領域の回転子の外周部のみに溝を配置するため、回転子の遠心力による応力を低減でき、回転電機の効率、信頼性が向上する。 [3-3. effect]
According to the third embodiment of the present invention having the above-described configuration, in addition to the effects of the first embodiment, the groove 7 of the opening disposed at the end of the peripheral region of the d-axis of the rotor is coupled and horizontally long. By doing so, it is possible to provide a permanent magnet type rotating electrical machine that reduces the iron loss during high-speed operation and suppresses the temperature rise of the rotating electrical machine more than the configuration of the first embodiment. Further, also in this embodiment, since grooves are not arranged in the outer peripheral portion on the q-axis of the rotor but only in the outer peripheral portion of the rotor in the peripheral region of the rotor d-axis, the centrifugal force of the rotor This can reduce the stress caused by the rotation and improve the efficiency and reliability of the rotating electrical machine.

［４−１．構成］
本発明の実施例４は、実施例１の永久磁石式回転電機において、回転子の開口部７の形状を変更したものである。図７を用いて本発明の実施例４を説明する。 [4-1. Constitution]
Example 4 of the present invention is a permanent magnet type rotating electrical machine of Example 1 in which the shape of the opening 7 of the rotor is changed. A fourth embodiment of the present invention will be described with reference to FIG.

図７は本発明の実施例４における永久磁石式回転電機の展開断面図である。本実施例の回転電機は、図７に示すとおり、回転子鉄心１ａの外周部分には、ティース５の先端両端５ａと５ｂとの間隔と同じ間隔で、一組の開口部７として磁気障壁である空隙７ａ，７ｂを配置する。すなわち、ティース先端両端５ａと向かい合う回転子鉄心１ａの外周部分には開口部である空隙７ａを配置し、ティース先端両端５ｂと向かい合う外周部分には、開口部である空隙７ｂを配置する。この空隙７ａと空隙７ｂは、２つで１つのペア溝を形成する。   FIG. 7 is a developed cross-sectional view of a permanent magnet type rotating electric machine according to Embodiment 4 of the present invention. As shown in FIG. 7, the rotating electrical machine of the present embodiment has a magnetic barrier as a set of openings 7 on the outer peripheral portion of the rotor core 1 a at the same interval as the interval between the tip ends 5 a and 5 b of the tooth 5. A certain gap 7a, 7b is arranged. That is, a gap 7a as an opening is disposed in the outer peripheral portion of the rotor core 1a facing both ends of the tooth tip 5a, and a gap 7b as an opening is disposed in the outer peripheral portion facing both ends 5b of the teeth. Two gaps 7a and 7b form one pair groove.

この開口部の空隙７ａ，７ｂの形状は、それぞれ同一とし、この開口部の空隙７ａ，７ｂを設ける位置は、回転子鉄心１ａの外周部分のｄ軸の周辺領域のみとする。すなわち、回転子鉄心１ａの外周部分でも、ｑ軸の周辺領域には、開口部７を配置しない。このため、回転子のｄ軸の周辺領域の端部では、ペア空隙の一方のみの溝７を配置する場合もある。   The shapes of the gaps 7a and 7b in the opening are the same, and the positions where the gaps 7a and 7b in the opening are provided are only in the peripheral area of the d-axis in the outer peripheral portion of the rotor core 1a. That is, the opening 7 is not arranged in the peripheral region of the q axis even in the outer peripheral portion of the rotor core 1a. For this reason, only one groove 7 of the pair gap may be arranged at the end of the peripheral area of the d-axis of the rotor.

この開口部７の形状は、固定子ティース先端部に流れる高調波磁束を抑制する形状とする。また、全ての開口部の空隙７の形状を同一のものとする必要はなく、回転子のｄ軸の周辺領域の端部に配置する開口部７の形状を拡大したりしても良い。すなわち、使用する永久磁石６の保磁力や磁化電流によって生じる磁界の強さなどに応じて、適宜変更することができる。   The shape of the opening 7 is a shape that suppresses the harmonic magnetic flux that flows to the tip of the stator teeth. Moreover, it is not necessary to make the shape of the space | gap 7 of all the opening parts the same, and the shape of the opening part 7 arrange | positioned in the edge part of the periphery area | region of d axis | shaft of a rotor may be expanded. That is, it can be appropriately changed according to the coercive force of the permanent magnet 6 to be used and the strength of the magnetic field generated by the magnetizing current.

［４−２．作用］
次に、前記のような構成を有する本実施形態の永久磁石式回転電機の作用について説明する。開口部７として磁気障壁である空隙を回転子内に配置した場合にでも、前記各実施例と同様に鉄損が低減され、回転子より固定子ティース先端部に流れる高調波磁束が更に抑制される。 [4-2. Action]
Next, the operation of the permanent magnet type rotating electrical machine of the present embodiment having the above-described configuration will be described. Even when a gap, which is a magnetic barrier, is arranged in the rotor as the opening 7, the iron loss is reduced as in the above embodiments, and the harmonic magnetic flux that flows from the rotor to the tip of the stator teeth is further suppressed. The

［４−３．効果］
以上のような構成を有する本発明の実施例４によれば、固定子ティース先端の間隔で一組の回転子鉄心内に開口部として磁気障壁である空隙７を配置することにより、前記各実施例と同様に、高速運転時の鉄損を低減し、回転電機の温度上昇を抑制した永久磁石式回転電機を提供できる。さらに、本実施例でも、回転子のｑ軸上の外周部には空隙７を配置せず、回転子鉄心１ａの外周部分のｄ軸の周辺領域のみに空隙７を配置するため、回転子の遠心力による応力を低減でき、回転電機の効率、信頼性が向上する。 [4-3. effect]
According to the fourth embodiment of the present invention having the above-described configuration, the gaps 7 as magnetic barriers are arranged as openings in a pair of rotor cores at intervals between the stator teeth, and each of the above-described embodiments. Similar to the example, it is possible to provide a permanent magnet type rotating electrical machine that reduces iron loss during high-speed operation and suppresses the temperature rise of the rotating electrical machine. Furthermore, also in this embodiment, the gap 7 is not arranged in the outer peripheral portion on the q-axis of the rotor, and the gap 7 is arranged only in the peripheral area of the d-axis in the outer peripheral portion of the rotor core 1a. Stress due to centrifugal force can be reduced, improving the efficiency and reliability of rotating electrical machines.

［５−１．構成］
本発明の実施例５は、実施例１の永久磁石式回転電機において、永久磁石６の配置場所と数を変更したものである。図８を用いて本発明の実施例５を説明する。 [5-1. Constitution]
The fifth embodiment of the present invention is a permanent magnet type rotating electrical machine of the first embodiment in which the location and number of permanent magnets 6 are changed. A fifth embodiment of the present invention will be described with reference to FIG.

図８は本発明の実施例５における永久磁石式回転電機の展開断面図である。本実施例の回転電機は、図８に示すとおり、回転子の磁極部８を構成する永久磁石６として、板状の永久磁石６を１つ配置するものである。   FIG. 8 is a developed cross-sectional view of a permanent magnet type rotating electric machine according to Embodiment 5 of the present invention. As shown in FIG. 8, the rotating electrical machine of the present embodiment has one plate-like permanent magnet 6 arranged as the permanent magnet 6 constituting the magnetic pole portion 8 of the rotor.

図８では、板状の永久磁石６を１つ配置し磁極部８を構成したが、磁極部８を１個の永久磁石６のみで構成するのではなく、複数の永久磁石６を磁気的に組み合わせることにより構成しても良い。具体的には、複数の板状の永久磁石６を複数個並べることにより、１つの板状の永久磁石６とすることもできる。   In FIG. 8, one plate-like permanent magnet 6 is arranged to form the magnetic pole portion 8, but the magnetic pole portion 8 is not composed of only one permanent magnet 6, but a plurality of permanent magnets 6 are magnetically arranged. You may comprise by combining. Specifically, one plate-like permanent magnet 6 can be obtained by arranging a plurality of plate-like permanent magnets 6.

［５−２．作用］
次に、前記のような構成を有する本実施形態の永久磁石式回転電機の作用について説明する。回転子の磁極を１つの板状の永久磁石６とした場合にでも、前記各実施例と同様に鉄損が低減され、回転子より固定子ティース先端部に流れる高調波磁束が更に抑制される。 [5-2. Action]
Next, the operation of the permanent magnet type rotating electrical machine of the present embodiment having the above-described configuration will be described. Even when the magnetic pole of the rotor is a single plate-like permanent magnet 6, the iron loss is reduced as in the above embodiments, and the harmonic magnetic flux flowing from the rotor to the tip of the stator teeth is further suppressed. .

［５−３．効果］
以上のような構成を有する本発明の実施例４によれば、回転子の磁極部８を１つの板状の永久磁石により構成した場合でも、前記各実施例と同様に、高速運転時の鉄損を低減し、回転電機の温度上昇を抑制した永久磁石式回転電機を提供できる。さらに、本実施例でも、回転子のｑ軸上の外周部には空隙７を配置せず、回転子ｄ軸周辺領域の回転子の外周部のみに空隙７を配置するため、回転子の遠心力による応力を低減でき、回転電機の効率、信頼性が向上する。 [5-3. effect]
According to the fourth embodiment of the present invention having the above-described configuration, even when the magnetic pole portion 8 of the rotor is configured by a single plate-like permanent magnet, the iron during high-speed operation is the same as in the above-described embodiments. It is possible to provide a permanent magnet type rotating electrical machine in which loss is reduced and temperature rise of the rotating electrical machine is suppressed. Furthermore, also in this embodiment, since the gap 7 is not arranged in the outer peripheral portion on the q-axis of the rotor, but only in the outer peripheral portion of the rotor in the region around the rotor d-axis, the rotor centrifuge is arranged. Stress due to force can be reduced, improving the efficiency and reliability of rotating electrical machines.

１…固定子
１ａ…固定子鉄心
２…電機子巻線
３…回転子
３ａ…回転子鉄心
４…スロット
５…ティース
６…永久磁石
７…開口部
８…磁極部 DESCRIPTION OF SYMBOLS 1 ... Stator 1a ... Stator iron core 2 ... Armature winding 3 ... Rotor 3a ... Rotor iron core 4 ... Slot 5 ... Teeth 6 ... Permanent magnet 7 ... Opening 8 ... Magnetic pole part

Claims (5)

固定子鉄心に電機子巻線を有する固定子と、前記複数の永久磁石を外周部に内蔵した回転子鉄心を有する回転子とを備える永久磁石式回転電機において、
前記固定子鉄心の内周には、電機子巻線の巻回用のスロットに挟まれた固定子ティースが設けられ、
前記回転子鉄心の外周部分に、２つの溝からなる開口部を複数配置し、
前記開口部における１つの溝と他方の溝との間隔が、前記固定子ティース先端部の一端と他端との間隔で配置され、
前記開放部の間隔をスロットピッチ角度の間隔で配置することを特徴とする永久磁石式回転電機。 In a permanent magnet type rotating electrical machine comprising a stator having an armature winding in a stator core, and a rotor having a rotor core in which the plurality of permanent magnets are built in an outer periphery,
On the inner circumference of the stator core, there is provided a stator tooth sandwiched between slots for winding the armature winding,
A plurality of openings composed of two grooves are arranged on the outer periphery of the rotor core ,
An interval between one groove and the other groove in the opening is arranged at an interval between one end and the other end of the stator tooth tip,
A permanent magnet type rotating electrical machine characterized in that the intervals between the open portions are arranged at intervals of slot pitch angles . 前記開口部は、前記回転子鉄心の外周部分のｄ軸の周辺領域に配置した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 opening is disposed in a peripheral region of the d-axis of the outer peripheral portion of the rotor core. 前記回転子鉄心の外周部分のｄ軸の周辺領域の端部に配置する開口部の幅を、ｄ軸の周辺領域の中心部に配置する開口部の幅よりも拡大したことを特徴とする請求項１または請求項２に記載の永久磁石式回転電機。 The width of the opening arranged at the end of the peripheral area of the d-axis in the outer peripheral portion of the rotor core is larger than the width of the opening arranged at the center of the peripheral area of the d-axis. The permanent magnet type rotating electrical machine according to claim 1 or 2 . 前記回転子鉄心の外周部分のｄ軸の周辺領域の最端部に配置する開口部を、隣接する開口部と結合することで、横長にしたことを特徴とする請求項１〜３のいずれか１項に記載の永久磁石式回転電機。 An opening to be placed at the end of the peripheral region of the d-axis of the outer peripheral portion of the rotor core, by combining with the adjacent opening, claim 1-3, characterized in that the horizontal The permanent magnet type rotating electrical machine according to item 1. 前記開口部が、回転子鉄心の外周部分に設けられた磁気障壁である空隙であることを特徴とする請求項１〜４のいずれか１項に記載の永久磁石式回転電機。
The opening is, the permanent magnet rotating electrical machine according to any one of claims 1 to 4, characterized in that a gap is a magnetic barrier provided in the outer peripheral portion of the rotor core.
JP2010110369A 2010-05-12 2010-05-12 Permanent magnet rotating electric machine Active JP5679695B2 (en)

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