JP2009050099A - Rotor core, permanent magnet rotor, and permanent magnet synchronous electric rotating machine - Google Patents

Rotor core, permanent magnet rotor, and permanent magnet synchronous electric rotating machine Download PDF

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JP2009050099A
JP2009050099A JP2007214585A JP2007214585A JP2009050099A JP 2009050099 A JP2009050099 A JP 2009050099A JP 2007214585 A JP2007214585 A JP 2007214585A JP 2007214585 A JP2007214585 A JP 2007214585A JP 2009050099 A JP2009050099 A JP 2009050099A
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permanent magnet
rotor
rotor core
rotation axis
rectangular parallelepiped
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JP2009050099A5 (en
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Motomichi Oto
基道 大戸
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Yaskawa Electric Corp
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Yaskawa Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor core, a permanent magnet rotor and a permanent magnet synchronous electric rotating machine, capable of restraining degradation of flux density due to skew and degradation of performance of the electric rotating machine and facilitating manufacture. <P>SOLUTION: A permanent magnet 2 is inserted in a permanent magnet insertion slot 34 obliquely formed to an axial direction of the rotor core 3, and magnets 2 adjacent to each other are placed so that identical poles face each other to form the rotor 1. A stator is placed so as to face the rotor 1 through a clearance, and the rotor 1 and the stator support so as to rotate relatively to each other, thus obtaining the permanent magnet motor with high performance while preventing cogging torque from generating. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は内部に界磁用の永久磁石を配置するための回転子コア、永久磁石回転子および永久磁石形同期回転電機に関する。   The present invention relates to a rotor core, a permanent magnet rotor, and a permanent magnet type synchronous rotating electric machine for arranging a field permanent magnet therein.

本発明は同期電動機および同期発電機に適用できるものであるが、以下では同期電動機の例で説明する。
従来、永久磁石形電動機の回転子コアに設けた内磁形の永久磁石形電動機として、回転子に設けた永久磁石挿入溝に永久磁石を挿入した構造のものがある。
図７は第１従来例を示す内磁形の永久磁石形電動機に用いられる回転子の概略斜視図を示している。図において、１は回転子、２は直方形の永久磁石、３は回転子コア、４はシャフトである。永久磁石２は回転子コア３の端面３１から他端の端面３２に向けて開けられた永久磁石挿入溝３４に挿入されている。
図８は図７の回転子コアにおける永久磁石の配置を示す正面図である。図において、隣り合う永久磁石２ａと２ｂはその同極が対向するように配置され、回転子１の半径方向に向けて放射状に配置されている。モータ軸方向を回転子端面３１から３２（図７）に向かう方向とすると、永久磁石２はモータ軸方向に対し平行（図で紙面に垂直方向）に配置されている。
このような回転子１にスキューを形成する方法として、回転子１をモータ軸方向に分割し、分割した回転子を一定角度づつずらして階段状にしたものがある(例えば、特許文献１参照)。
図９は第２従来例を示す永久磁石形電動機に用いられる回転子の概略斜視図である。
図において、１は回転子、２は永久磁石、３は回転子コアである。１１〜１３はモータ軸方向に複数に分割した回転子コアと永久磁石を配置した分割回転子であり、回転子１は分割回転子１１〜１３を所定の角度でずらせて組み合わせることにより構成されている。
第１従来例は直方体の永久磁石を細長い溝に挿入して成る回転子であったが、第３従来例として、永久磁石挿入穴に樹脂製永久磁石を射出成形することによりスキューを構成したものがある。
図１０は第３従来例を示す永久磁石形電動機に用いられる回転子の概略斜視である。図において、１は回転子、２は永久磁石、３は回転子コアである。回転子コア３には永久磁石挿入溝３４が設けられており、樹脂製の永久磁石２を永久磁石挿入溝３４に射出成形することによって形成している。
図１１は図１０の回転子コア端面における永久磁石の配置を示す正面図であり、回転子コア端面３１，３２をモータ軸方向に見た図である。２１は回転子コア端面３１における永久磁石２の端面（実線）であり、２２は回転子コア端面３２における永久磁石２の端面（点線）である。永久磁石２は回転子コアに対し放射状に配置され、かつ回転子コア端面３１から３２に向けて連続的なスキューを構成しているのが判る。
特開昭６３−１４０６４５号公報（第２ページ、図１） Although the present invention can be applied to a synchronous motor and a synchronous generator, an example of a synchronous motor will be described below.
2. Description of the Related Art Conventionally, there is a structure in which a permanent magnet is inserted into a permanent magnet insertion groove provided in a rotor as an inner magnet type permanent magnet motor provided in a rotor core of a permanent magnet type motor.
FIG. 7 is a schematic perspective view of a rotor used in an internal magnet type permanent magnet motor showing a first conventional example. In the figure, 1 is a rotor, 2 is a rectangular permanent magnet, 3 is a rotor core, and 4 is a shaft. The permanent magnet 2 is inserted into a permanent magnet insertion groove 34 opened from the end face 31 of the rotor core 3 toward the end face 32 at the other end.
FIG. 8 is a front view showing the arrangement of permanent magnets in the rotor core of FIG. In the figure, adjacent permanent magnets 2 a and 2 b are arranged so that the same poles face each other, and are arranged radially toward the radial direction of the rotor 1. Assuming that the motor axis direction is a direction from the rotor end face 31 to 32 (FIG. 7), the permanent magnet 2 is arranged parallel to the motor axis direction (perpendicular to the paper surface in the figure).
As a method of forming a skew in such a rotor 1, there is a method in which the rotor 1 is divided in the motor axis direction, and the divided rotor is shifted by a certain angle to form a staircase (see, for example, Patent Document 1). .
FIG. 9 is a schematic perspective view of a rotor used in a permanent magnet type electric motor showing a second conventional example.
In the figure, 1 is a rotor, 2 is a permanent magnet, and 3 is a rotor core. Reference numerals 11 to 13 denote divided rotors in which a rotor core and permanent magnets divided into a plurality of parts in the motor shaft direction are arranged, and the rotor 1 is configured by combining the divided rotors 11 to 13 at a predetermined angle. Yes.
The first conventional example is a rotor formed by inserting a rectangular parallelepiped permanent magnet into an elongated groove. As a third conventional example, a skew is formed by injection molding a resin permanent magnet into a permanent magnet insertion hole. There is.
FIG. 10 is a schematic perspective view of a rotor used in a permanent magnet type motor showing a third conventional example. In the figure, 1 is a rotor, 2 is a permanent magnet, and 3 is a rotor core. The rotor core 3 is provided with a permanent magnet insertion groove 34, which is formed by injection molding the resin permanent magnet 2 into the permanent magnet insertion groove 34.
FIG. 11 is a front view showing the arrangement of the permanent magnets on the end surface of the rotor core of FIG. 10, and is a view of the end surfaces 31 and 32 of the rotor core viewed in the motor axis direction. 21 is an end surface (solid line) of the permanent magnet 2 on the rotor core end surface 31, and 22 is an end surface (dotted line) of the permanent magnet 2 on the rotor core end surface 32. It can be seen that the permanent magnets 2 are arranged radially with respect to the rotor core and constitute a continuous skew from the rotor core end faces 31 to 32.
Japanese Patent Laid-Open No. 63-140645 (second page, FIG. 1)

従来の内磁形の永久磁石モータでは、回転子と固定子間にコギングトルクが発生する。コギングトルクを低減するためには回転子にスキューを施す方法が有効である。
第２従来例に示すごとく、回転子をモータ軸方向に分割し、分割した回転子を一定角度づつずらし階段状にしてスキューを構成する場合では、コギングトルクが発生しなくなるものの、回転子がモータ軸方向に分割されているため、永久磁石の挿入および組み立て工数が増加するという問題があった。
また、第３従来例に示すごとく、射出成形で作成された樹脂製の永久磁石を用いてスキューを構成する場合、樹脂製の永久磁石は永久磁石としての性能が低いため、永久磁石の磁束密度が低くなり、モータの性能が低下するという問題があった。
また、樹脂製の永久磁石は成形後に着磁を行う必要があるが、永久磁石が軸方向に連続的にねじれているため、Ｎ・ＳあるいはＳ・Ｎの極性を正確にかつ十分に着磁することが難しいという問題があった。
本発明はこのような問題点に鑑みてなされたものであり、スキューによる磁束密度の低下による回転電機の性能低下を抑制し、製作が容易な回転子コア、永久磁石回転子および永久磁石形同期回転電機を提供することを目的とする。 In a conventional inner magnet type permanent magnet motor, cogging torque is generated between the rotor and the stator. In order to reduce the cogging torque, a method of skewing the rotor is effective.
As shown in the second conventional example, when the rotor is divided in the motor axis direction and the divided rotor is shifted by a certain angle to form a skew, the cogging torque is not generated, but the rotor is the motor. Since it is divided in the axial direction, there is a problem in that the number of man-hours for inserting and assembling a permanent magnet increases.
In addition, as shown in the third conventional example, when a skew is formed using a resin permanent magnet created by injection molding, the resin permanent magnet has a low performance as a permanent magnet. There is a problem that the motor performance decreases.
In addition, resin permanent magnets need to be magnetized after molding, but the permanent magnets are twisted continuously in the axial direction, so the polarity of N · S or S · N is accurately and sufficiently magnetized. There was a problem that it was difficult to do.
The present invention has been made in view of such problems, and suppresses the performance deterioration of the rotating electrical machine due to the decrease of the magnetic flux density due to the skew, and the rotor core, the permanent magnet rotor, and the permanent magnet type synchronization that are easy to manufacture. An object is to provide a rotating electrical machine.

上記問題を解決するため、本発明は、次のように構成したのである。
請求項１記載の回転子コアの発明は、直方体の永久磁石を挿入収納するための直方体状の挿入溝が回転軸方向の一端から他端に向けて貫通してなり、かつ前記挿入溝が複数個放射状に形成された回転子コアにおいて、前記直方体状の挿入溝が前記回転軸方向に対して斜めに形成されたことを特徴としている。
請求項２記載の発明は、請求項１記載の回転子コアにおいて、前記回転軸方向に対して斜めに形成された前記挿入溝がその挿入溝の回転軸方向中央で前記回転軸を横切っていることを特徴としている。
請求項３記載の回転子コアの発明は、直方体の永久磁石を挿入収納するための直方体状の挿入溝が回転軸方向の一端から他端に向けて貫通してなり、かつ前記挿入溝が複数個放射状に形成された回転子コアにおいて、前記挿入溝が前記回転子コアの両端から中間点に向けて回転軸方向に対して斜めに形成されかつ前記中間点で互いに貫通していることを特徴としている。
請求項４記載の発明は、請求項３記載の回転子コアにおいて、前記両端から前記中間点まで回転軸方向に対して斜めに形成された前記各挿入溝がそれぞれ前記各挿入溝の回転軸方向の中央で前記回転軸を横切っていることを特徴としている。
請求項５記載の発明は、請求項１〜４のいずれか１項記載の回転子コアにおいて、前記回転子コアが圧粉磁性体で形成されることを特徴としている。
請求項６記載の永久磁石回転子の発明は、請求項１または２記載の回転子コアと、前記回転子コアの前記複数の挿入溝にそれぞれ挿入された直方体の永久磁石と、を備えた永久磁石回転子において、前記直方体の永久磁石が、隣り合う同士の極性が互いに同極となるように対向配置されたことを特徴としている。
請求項７記載の永久磁石回転子の発明は、請求項３または４記載の回転子コアと、前記回転子コアの前記複数の挿入溝にそれぞれ挿入された直方体の永久磁石と、を備えた永久磁石回転子において、前記直方体の永久磁石が、隣り合う同士の極性が互いに同極となるように対向配置されたことを特徴としている。
請求項８記載の永久磁石形同期回転電機の発明は、永久磁石回転子と、前記永久磁石回転子と空隙を介して対向配置した固定子とを有し、前記永久磁石回転子と前記固定子が相対的に回転可能となるように支持されており、かつ前記固定子が固定子コアと多相の電機子コイルを備えてなる永久磁石形同期回転電機において、前記永久磁石回転子が請求項６または７記載の永久磁石回転子であることを特徴としている。 In order to solve the above problem, the present invention is configured as follows.
According to the first aspect of the rotor core, a rectangular parallelepiped insertion groove for inserting and storing a rectangular parallelepiped permanent magnet penetrates from one end to the other end in the rotation axis direction, and a plurality of the insertion grooves are provided. In the rotor core formed radially, the rectangular parallelepiped insertion groove is formed obliquely with respect to the rotation axis direction.
According to a second aspect of the present invention, in the rotor core according to the first aspect, the insertion groove formed obliquely with respect to the rotation axis direction crosses the rotation axis at the center of the insertion groove in the rotation axis direction. It is characterized by that.
According to a third aspect of the present invention, a rectangular parallelepiped insertion groove for inserting and storing a rectangular parallelepiped permanent magnet penetrates from one end to the other end in the direction of the rotation axis, and a plurality of the insertion grooves are provided. In the rotor core formed radially, the insertion grooves are formed obliquely with respect to the rotation axis direction from both ends of the rotor core toward the intermediate point and penetrate each other at the intermediate point. It is said.
According to a fourth aspect of the present invention, in the rotor core according to the third aspect, the insertion grooves formed obliquely with respect to the rotation axis direction from the both ends to the intermediate point are respectively in the rotation axis direction of the insertion grooves. It is characterized by crossing the rotation axis at the center.
According to a fifth aspect of the present invention, in the rotor core according to any one of the first to fourth aspects, the rotor core is formed of a dust magnetic material.
A permanent magnet rotor according to a sixth aspect of the present invention is a permanent magnet comprising the rotor core according to the first or second aspect, and a rectangular parallelepiped permanent magnet inserted into each of the plurality of insertion grooves of the rotor core. The magnet rotor is characterized in that the rectangular parallelepiped permanent magnets are arranged to face each other so that adjacent polarities are the same.
A permanent magnet rotor according to a seventh aspect of the present invention is a permanent magnet comprising the rotor core according to the third or fourth aspect, and a rectangular parallelepiped permanent magnet inserted into each of the plurality of insertion grooves of the rotor core. The magnet rotor is characterized in that the rectangular parallelepiped permanent magnets are arranged to face each other so that adjacent polarities are the same.
The invention of a permanent magnet type synchronous rotating electrical machine according to claim 8 includes a permanent magnet rotor and a stator that is arranged to face the permanent magnet rotor with a gap therebetween, and the permanent magnet rotor and the stator. In a permanent magnet type synchronous rotating electric machine in which the stator includes a stator core and a multi-phase armature coil. It is a permanent magnet rotor described in 6 or 7.

請求項１記載の発明によると、永久磁石の挿入および組み立て工数が増加することなくコギングが低減できる回転子コアが得られる。
請求項２記載の発明によると、永久磁石の配置を回転子のコア両端で対称となるので、コギングトルクを低減することができるとともに、モータ軸方向のトルクや吸引力のアンバランスを低減できる回転子コアが得られる。
請求項３記載の発明によると、永久磁石の挿入および組み立て工数が増加することなくコギングが低減できる回転子コアが得られる。
請求項４記載の発明によると、永久磁石の配置を回転子のコア両端で対称となるので、コギングトルクを低減することができるとともに、モータ軸方向のトルクや吸引力のアンバランスを低減できる回転子コアが得られる。
請求項５記載の発明によると、回転子コアを圧粉磁性体で形成したので、永久磁石の挿入溝をプレス成形などにより容易に形成することができる。
請求項６記載の発明によると、直方体の永久磁石をモータ軸方向に斜めに配置することによりスキューを形成したので永久磁石の挿入および組み立て工数が増加することなくコギングが低減できる。また、永久磁石の形状を直方体としているので、着磁も容易に行うことができる。
請求項７記載の発明によると、挿入溝が回転子コアの両端から中間点に向けて回転軸方向に対して斜めに形成されかつ中間点で互いに貫通しているので、この挿入溝にそれぞれ永久磁石を挿入するとモータ軸方向に対してＶ字形に配置することになり、スキューを形成し、永久磁石の挿入および組み立て工数が増加することなくコギングが低減できる。また、永久磁石の形状を直方体としているので、着磁も容易に行うことができる。
請求項８記載の発明によると、請求項６または７記載の回転子を使用しているのでコギングトルクを低減した回転電機を得ることができる。 According to the first aspect of the present invention, a rotor core that can reduce cogging without increasing the number of man-hours for inserting and assembling a permanent magnet can be obtained.
According to the second aspect of the present invention, since the permanent magnets are arranged symmetrically at both ends of the rotor core, the cogging torque can be reduced and the rotation capable of reducing the torque in the motor shaft direction and the unbalance of the attractive force. Child core is obtained.
According to the invention described in claim 3, a rotor core can be obtained in which cogging can be reduced without increasing the number of man-hours for inserting and assembling permanent magnets.
According to the fourth aspect of the invention, since the permanent magnets are arranged symmetrically at both ends of the rotor core, the cogging torque can be reduced, and the rotation capable of reducing the torque in the motor shaft direction and the unbalance of the attractive force can be reduced. Child core is obtained.
According to the fifth aspect of the present invention, since the rotor core is formed of the dust magnetic material, the insertion groove of the permanent magnet can be easily formed by press molding or the like.
According to the invention described in claim 6, since the skew is formed by arranging the rectangular parallelepiped permanent magnets obliquely in the motor axial direction, cogging can be reduced without increasing the number of man-hours for inserting and assembling the permanent magnets. Further, since the shape of the permanent magnet is a rectangular parallelepiped, magnetization can be easily performed.
According to the seventh aspect of the present invention, the insertion grooves are formed obliquely with respect to the rotation axis direction from both ends of the rotor core toward the intermediate point and penetrate each other at the intermediate point. When the magnet is inserted, it is arranged in a V shape with respect to the motor axial direction, and a skew is formed, so that cogging can be reduced without increasing the number of man-hours for inserting and assembling the permanent magnet. Further, since the shape of the permanent magnet is a rectangular parallelepiped, magnetization can be easily performed.
According to the invention described in claim 8, since the rotor according to claim 6 or 7 is used, a rotating electrical machine with reduced cogging torque can be obtained.

以下、本発明の実施の形態について図を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明の第１実施例に係る永久磁石回転子の概略斜視図を示している。
図において、１は回転子、２は永久磁石、３は回転子コア、４はシャフトである。回転子コア３は積層コアで構成されており、永久磁石２を挿入するための溝３４が軸方向に対して斜めに設けられている。シャフト４は回転子コア３の中央中空部に挿入され、焼きばめなどの手段により回転子コア３と連結されている。
永久磁石２の形状は直方体であり、希土類系の焼結磁石を用いている。
図２は第１実施例の永久磁石回転子のコアの溝への永久磁石の挿入を模式的に示した図である。図２に示すように永久磁石２はあらかじめＮ・Ｓの着磁を行った後、回転子コア３の永久磁石挿入溝３４の中に挿入される。
本発明が従来技術と異なる部分は、直方体の永久磁石を回転子軸方向に対し斜めに配置している点である。
図３は第１実施例の永久磁石の配置を示す図で、（ａ）は回転子コアの一端面における永久磁石の配置関係を示した正面図、（ｂ）は回転子コアの他端面における永久磁石の配置関係を示した正面図である。
２１，２２は回転子コア端面３１，３２（図１参照）における永久磁石２の側面であり、本実施例では、回転子コア端面３１では永久磁石側面２１の中心線と回転子コアの半径方向の中心軸が一致するように放射状に配置し、回転子コア端面３２では永久磁石側面２２の中心線が回転子の半径方向の中心軸から所定の距離ｇ離れるように永久磁石２を配置している。
このように永久磁石２を斜めに挿入することでスキューを構成できるので、コギングを低減することができる。
また、直方体の永久磁石２を用いているので着磁が容易であり、かつ高性能の希土類磁石を適用することができるため、この回転子を使用したモータはそのモータの特性を向上させることができる。
また、永久磁石２の形状が直方体であるため、永久磁石２の溝３４への挿入も容易であり、工数増加を抑えられる。 FIG. 1 is a schematic perspective view of a permanent magnet rotor according to a first embodiment of the present invention.
In the figure, 1 is a rotor, 2 is a permanent magnet, 3 is a rotor core, and 4 is a shaft. The rotor core 3 is formed of a laminated core, and a groove 34 for inserting the permanent magnet 2 is provided obliquely with respect to the axial direction. The shaft 4 is inserted into the central hollow portion of the rotor core 3 and connected to the rotor core 3 by means such as shrink fitting.
The shape of the permanent magnet 2 is a rectangular parallelepiped, and a rare earth sintered magnet is used.
FIG. 2 is a diagram schematically showing the insertion of the permanent magnet into the groove of the core of the permanent magnet rotor of the first embodiment. As shown in FIG. 2, the permanent magnet 2 is inserted into the permanent magnet insertion groove 34 of the rotor core 3 after N · S is magnetized in advance.
The present invention is different from the prior art in that a rectangular parallelepiped permanent magnet is disposed obliquely with respect to the rotor axial direction.
3A and 3B are diagrams showing the arrangement of the permanent magnets according to the first embodiment. FIG. 3A is a front view showing the arrangement relationship of the permanent magnets on one end face of the rotor core, and FIG. 3B is the other end face of the rotor core. It is the front view which showed the arrangement | positioning relationship of the permanent magnet.
21 and 22 are side surfaces of the permanent magnet 2 on the rotor core end surfaces 31 and 32 (see FIG. 1). In this embodiment, the rotor core end surface 31 has a center line of the permanent magnet side surface 21 and the radial direction of the rotor core. The permanent magnets 2 are arranged radially so that their center axes coincide with each other, and the center line of the permanent magnet side face 22 is separated from the center axis in the radial direction of the rotor by a predetermined distance g on the rotor core end face 32. Yes.
Since the skew can be configured by inserting the permanent magnet 2 obliquely in this manner, cogging can be reduced.
In addition, since the rectangular permanent magnet 2 is used, magnetization is easy and a high performance rare earth magnet can be applied. Therefore, a motor using this rotor can improve the characteristics of the motor. it can.
Moreover, since the shape of the permanent magnet 2 is a rectangular parallelepiped, it is easy to insert the permanent magnet 2 into the groove 34, and the man-hour increase can be suppressed.

図４は本発明の第２実施例を示す永久磁石回転子の斜視図である。
図において、回転子コア３に設けられた永久磁石挿入溝３４を回転子コアの両端３１、３２から中間点に向けて回転軸方向に対して斜めに形成し、かつ中間点で互いに貫通させて、全体でモータ軸方向に対しＶ字になるよう構成している。
このように構成することで、永久磁石２を回転子コア３の両端部から挿入するので挿入抵抗が図１と比べて半分になり挿入し易くなる。また、Ｖ字形のスキューを構成できるので、コギングを低減することができる。 FIG. 4 is a perspective view of a permanent magnet rotor showing a second embodiment of the present invention.
In the figure, the permanent magnet insertion groove 34 provided in the rotor core 3 is formed obliquely with respect to the rotation axis direction from both ends 31 and 32 of the rotor core toward the intermediate point, and penetrates each other at the intermediate point. The overall configuration is V-shaped with respect to the motor shaft direction.
By configuring in this way, the permanent magnet 2 is inserted from both ends of the rotor core 3, so that the insertion resistance becomes half that of FIG. Further, since a V-shaped skew can be configured, cogging can be reduced.

図５は第３実施例の永久磁石の配置を示す図で、（ａ）は回転子コアの一端面における永久磁石の配置関係を示した正面図、（ｂ）は回転子コアの他端面における永久磁石の配置関係を示した正面図である。
本実施例と第１実施例と異なるのは、本実施例では、回転子コア端面３１では永久磁石側面２１の中心線を通る永久磁石２を回転子コアの半径方向の中心軸からから所定距離「＋ｄ」離れて配置し、他方の回転子コア端面３２では永久磁石側面２２の中心線を「−ｄ」離れて配置している点である。
このように、永久磁石におけるモータ軸方向の磁気分布をモータ軸に対して均等にしているのでコギングを低減すると同時にモータの磁気吸引力のアンバランスを抑制できる。 FIGS. 5A and 5B are diagrams showing the arrangement of the permanent magnets of the third embodiment. FIG. 5A is a front view showing the arrangement relationship of the permanent magnets on one end face of the rotor core, and FIG. 5B is the other end face of the rotor core. It is the front view which showed the arrangement | positioning relationship of the permanent magnet.
The difference between the present embodiment and the first embodiment is that, in this embodiment, the permanent magnet 2 passing through the center line of the permanent magnet side surface 21 on the rotor core end surface 31 is a predetermined distance from the radial center axis of the rotor core. The center line of the permanent magnet side surface 22 is arranged “−d” apart from the other rotor core end face 32.
Thus, since the magnetic distribution in the motor axis direction of the permanent magnet is made uniform with respect to the motor axis, cogging can be reduced and at the same time, the unbalance of the magnetic attractive force of the motor can be suppressed.

図６は本発明の第４実施例を示す永久磁石回転子概略斜視図である。
本実施例が第１実施例と異なるのは、本実施例では回転子コアを圧粉磁性体を用いて構成している点である。このように圧粉磁性体を用いると永久磁石挿入溝をプレス成形等により製作することができるため、回転子コアの製作が容易となる。 FIG. 6 is a schematic perspective view of a permanent magnet rotor showing a fourth embodiment of the present invention.
This embodiment is different from the first embodiment in that the rotor core is configured by using a dust magnetic material in this embodiment. When the dust magnetic material is used in this way, the permanent magnet insertion groove can be manufactured by press molding or the like, so that the rotor core can be easily manufactured.

以上のように、本発明によれば、挿入溝が回転子コアの端面から回転軸方向に対して斜めに形成されかつこの挿入溝に永久磁石を挿入するので、スキューを形成し、永久磁石の挿入および組み立て工数が増加することなくコギングが低減できる。また、永久磁石の形状を直方体としているので、着磁も容易に行うことができる。
本発明は工作機やロボットなどに用いる回転型モータの回転子として適用できる。また、同じ理由から回転型発電機の回転子としても適用できる。 As described above, according to the present invention, the insertion groove is formed obliquely with respect to the rotation axis direction from the end surface of the rotor core, and the permanent magnet is inserted into the insertion groove. Cogging can be reduced without increasing the number of insertion and assembly steps. Further, since the shape of the permanent magnet is a rectangular parallelepiped, magnetization can be easily performed.
The present invention can be applied as a rotor of a rotary motor used for a machine tool or a robot. For the same reason, it can also be applied as a rotor of a rotary generator.

本発明の第１実施例を示す永久磁石回転子の概略斜視図である。1 is a schematic perspective view of a permanent magnet rotor showing a first embodiment of the present invention. 第１実施例の永久磁石回転子のコアの溝への永久磁石の挿入を模式的に示した図である。It is the figure which showed typically insertion of the permanent magnet to the groove | channel of the core of the permanent magnet rotor of 1st Example. 第１実施例の永久磁石の配置を示す正面図である。It is a front view which shows arrangement | positioning of the permanent magnet of 1st Example. 本発明の第２実施例を示す永久磁石回転子の斜視図である。It is a perspective view of the permanent magnet rotor which shows 2nd Example of this invention. 本発明の第３実施例を示す永久磁石回転子における永久磁石の配置を示す正面図である。It is a front view which shows arrangement | positioning of the permanent magnet in the permanent magnet rotor which shows 3rd Example of this invention. 本発明の第４実施例を示す永久磁石回転子概略斜視図である。It is a schematic perspective view of the permanent magnet rotor which shows 4th Example of this invention. 第１従来例を示す内磁形の永久磁石形電動機に用いられる回転子の概略斜視図である。It is a schematic perspective view of the rotor used for the internal magnet type permanent magnet type motor which shows a 1st prior art example. 図７の回転子コアにおける永久磁石の配置を示す正面図である。It is a front view which shows arrangement | positioning of the permanent magnet in the rotor core of FIG. 第２従来例を示す永久磁石形電動機に用いられる回転子の概略斜視図である。It is a schematic perspective view of the rotor used for the permanent magnet type motor which shows a 2nd prior art example. 第３従来例を示す永久磁石形電動機に用いられる回転子の概略斜視である。It is a schematic perspective view of the rotor used for the permanent magnet type motor which shows a 3rd prior art example. 図１０の回転子コア端面における永久磁石の配置を示す正面図である。It is a front view which shows arrangement | positioning of the permanent magnet in the rotor core end surface of FIG.

符号の説明Explanation of symbols

１ 回転子
１１ 分割回転子
２ 永久磁石
２１ 回転子コアの一端面３１における永久磁石側面
２２ 回転子コアの他端面３２における永久磁石側面
３ 回転子コア
３１ 回転子コアの一端面
３２ 回転子コアの他端面
３３ シャフト挿入穴
３４ 永久磁石挿入溝
４ シャフト DESCRIPTION OF SYMBOLS 1 Rotor 11 Split rotor 2 Permanent magnet 21 The permanent magnet side surface 22 in the end surface 31 of a rotor core The permanent magnet side surface 3 in the other end surface 32 of a rotor core Rotor core 31 One end surface 32 of a rotor core Other end surface 33 Shaft insertion hole 34 Permanent magnet insertion groove 4 Shaft

Claims (8)

直方体の永久磁石を挿入収納するための直方体状の挿入溝が回転軸方向の一端から他端に向けて貫通してなり、かつ前記挿入溝が複数個放射状に形成された回転子コアにおいて、
前記直方体状の挿入溝が前記回転軸方向に対して斜めに形成されたことを特徴とする回転子コア。 In a rotor core in which a rectangular parallelepiped insertion groove for inserting and storing a rectangular parallelepiped permanent magnet penetrates from one end to the other end in the rotation axis direction, and a plurality of the insertion grooves are formed radially,
The rotor core, wherein the rectangular parallelepiped insertion groove is formed obliquely with respect to the rotation axis direction. 前記回転軸方向に対して斜めに形成された前記挿入溝が、その挿入溝の回転軸方向中央で前記回転軸を横切っていることを特徴とする請求項１記載の回転子コア。   The rotor core according to claim 1, wherein the insertion groove formed obliquely with respect to the rotation axis direction crosses the rotation axis at the center of the insertion groove in the rotation axis direction. 直方体の永久磁石を挿入収納するための直方体状の挿入溝が回転軸方向の一端から他端に向けて貫通してなり、かつ前記挿入溝が複数個放射状に形成された回転子コアにおいて、
前記挿入溝が前記回転子コアの両端から中間点に向けて回転軸方向に対して斜めに形成されかつ前記中間点で互いに貫通していることを特徴とする回転子コア。 In a rotor core in which a rectangular parallelepiped insertion groove for inserting and storing a rectangular parallelepiped permanent magnet penetrates from one end to the other end in the rotation axis direction, and a plurality of the insertion grooves are formed radially,
The rotor core, wherein the insertion grooves are formed obliquely with respect to the rotation axis direction from both ends of the rotor core toward an intermediate point and penetrate each other at the intermediate point. 前記両端から前記中間点まで回転軸方向に対して斜めに形成された前記各挿入溝がそれぞれ前記各挿入溝の回転軸方向の中央で前記回転軸を横切っていることを特徴とする請求項３記載の回転子コア。   4. The insertion grooves formed obliquely with respect to the rotation axis direction from the both ends to the intermediate point cross the rotation axis at the center in the rotation axis direction of the insertion grooves, respectively. The described rotor core. 前記回転子コアが圧粉磁性体で形成されることを特徴とする請求項１〜４のいずれか１項記載の回転子コア。   The rotor core according to claim 1, wherein the rotor core is formed of a dust magnetic material. 請求項１または２記載の回転子コアと、前記回転子コアの前記複数の挿入溝にそれぞれ挿入された直方体の永久磁石と、を備えた永久磁石回転子において、
前記直方体の永久磁石が、隣り合う同士の極性が互いに同極となるように対向配置されたことを特徴とする永久磁石回転子。 A permanent magnet rotor comprising: the rotor core according to claim 1; and a rectangular parallelepiped permanent magnet respectively inserted into the plurality of insertion grooves of the rotor core.
A permanent magnet rotor, wherein the rectangular parallelepiped permanent magnets are arranged to face each other so that adjacent polarities are the same. 請求項３または４記載の回転子コアと、前記回転子コアの前記複数の挿入溝にそれぞれ挿入された直方体の永久磁石と、を備えた永久磁石回転子において、
前記直方体の永久磁石が、隣り合う同士の極性が互いに同極となるように対向配置されたことを特徴とする永久磁石回転子。 A permanent magnet rotor comprising: the rotor core according to claim 3; and a rectangular parallelepiped permanent magnet respectively inserted into the plurality of insertion grooves of the rotor core.
A permanent magnet rotor, wherein the rectangular parallelepiped permanent magnets are arranged to face each other so that adjacent polarities are the same. 永久磁石回転子と、前記永久磁石回転子と空隙を介して対向配置した固定子とを有し、前記永久磁石回転子と前記固定子が相対的に回転可能となるように支持されており、かつ前記固定子が固定子コアと多相の電機子コイルを備えてなる永久磁石形同期回転電機において、
前記永久磁石回転子が請求項６または７記載の永久磁石回転子であることを特徴とする永久磁石形同期回転電機。 A permanent magnet rotor, and a permanent magnet rotor and a stator arranged opposite to each other via a gap, and the permanent magnet rotor and the stator are supported so as to be relatively rotatable, And in the permanent magnet type synchronous rotating electric machine in which the stator comprises a stator core and a multi-phase armature coil,
A permanent magnet type synchronous rotating electric machine, wherein the permanent magnet rotor is a permanent magnet rotor according to claim 6 or 7.
JP2007214585A 2007-08-21 2007-08-21 Rotor core, permanent magnet rotor, and permanent magnet synchronous electric rotating machine Pending JP2009050099A (en)

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