JP2006325348A - Rotor - Google Patents

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JP2006325348A
JP2006325348A JP2005147414A JP2005147414A JP2006325348A JP 2006325348 A JP2006325348 A JP 2006325348A JP 2005147414 A JP2005147414 A JP 2005147414A JP 2005147414 A JP2005147414 A JP 2005147414A JP 2006325348 A JP2006325348 A JP 2006325348A
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rotor
rotating shaft
permanent magnet
tile
motor
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Kenichi Yamanaka
憲一 山中
Junichi Sato
純一 佐藤
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Nidec Shibaura Corp
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Nidec Shibaura Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor wherein magnet flux can be enhanced and further a permanent magnet can be installed with certainty. <P>SOLUTION: In the rotor 10, a rotating shaft 14 penetrates a rotor core 12 in the center, and roofing tile-shaped permanent magnets 22 are embedded in multiple insertion holes 20, provided around the center of the rotor core in the axial direction. The roofing tile-shaped permanent magnets 22 are disposed, with their convex portions facing toward the rotating shaft, and the curvature of the convex portions is set to be smaller than the curvature of the concave portions of the permanent magnets. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ブラシレスＤＣモータなどのモータにおける回転子に関するものである。   The present invention relates to a rotor in a motor such as a brushless DC motor.

従来よりブラシレスＤＣモータなどの回転子は、複数枚の鋼板を積層して回転子鉄心を形成し、この回転子鉄心内部に板状の永久磁石を埋設した構造が一般的である（例えば、特許文献１参照）。   Conventionally, a rotor such as a brushless DC motor generally has a structure in which a plurality of steel plates are laminated to form a rotor core, and a plate-like permanent magnet is embedded in the rotor core (for example, a patent) Reference 1).

このような従来の回転子の構造について、図面に基づいて説明する。   The structure of such a conventional rotor will be described with reference to the drawings.

（１）第１の従来例の回転子１００の構造
第１の従来例の回転子１００の構造について、図８及び図９に基づいて説明する。 (1) Structure of Rotor 100 of First Conventional Example The structure of the rotor 100 of the first conventional example will be described with reference to FIGS.

第１の従来例の回転子１００は、ＩＰＭ（インパーマネントマグネット）型の回転子である。図８に示すように、断面形状が円弧型のいわゆる瓦型の永久磁石１０２が、鋼板を積層した回転子鉄心１０４の挿入孔１０６に挿入されている。   The rotor 100 of the first conventional example is an IPM (permanent magnet) type rotor. As shown in FIG. 8, a so-called tile-shaped permanent magnet 102 having an arc-shaped cross section is inserted into an insertion hole 106 of a rotor core 104 in which steel plates are laminated.

（２）第２の従来例の回転子２００の構造
第２の従来例の回転子２００の構造について、図１０及び図１１に基づいて説明する。 (2) Structure of Rotor 200 of Second Conventional Example The structure of the rotor 200 of the second conventional example will be described with reference to FIGS.

この回転子２００は、ＩＰＭ型の回転子１００とは異なり、鋼板を積層した回転子鉄心２０２の外周部に６個の凹部２０４が軸方向に設けられ、各凹部２０４に、永久磁石２０６が接着剤や、筒状のステンレス部材によって取り付けられている。
特開平６−２１７４７７号公報 Unlike the IPM type rotor 100, this rotor 200 is provided with six recesses 204 in the axial direction on the outer periphery of a rotor core 202 in which steel plates are laminated, and a permanent magnet 206 is bonded to each recess 204. It is attached with an agent or a cylindrical stainless steel member.
JP-A-6-217477

第１の従来例の回転子１００においては、モータ特性が出ない場合には、永久磁石１０２の材質を変更したり、回転子１００の外形と永久磁石１０２の円弧状の形状を大きくし、マグネットフラックスを向上させて、モータ特性を改善していた。しかしながら、上記のような改善方法であるとコストが上昇すると共に、回転子１００の外形が大きくなるという問題点がある。   In the rotor 100 of the first conventional example, when the motor characteristics do not appear, the material of the permanent magnet 102 is changed, or the outer shape of the rotor 100 and the arcuate shape of the permanent magnet 102 are increased. The motor characteristics were improved by improving the flux. However, the improvement method as described above has a problem that the cost increases and the outer shape of the rotor 100 increases.

第２の従来例の回転子２００においては、回転子鉄心２０２の外周部に永久磁石２０６を取り付ける場合に、永久磁石２０６が傾いて取り付けられるという問題点があり、この場合にはバランスが崩れ回転子２００の回転効率が下がる。   In the rotor 200 of the second conventional example, when the permanent magnet 206 is attached to the outer peripheral portion of the rotor core 202, there is a problem that the permanent magnet 206 is inclined and attached. The rotational efficiency of the child 200 is reduced.

そこで、本発明は上記問題点に鑑み、マグネットフラックスを向上させることができると共に、確実に永久磁石を取り付けることができる回転子を提供する。   Therefore, in view of the above problems, the present invention provides a rotor that can improve a magnet flux and can securely attach a permanent magnet.

請求項１に係る発明は、鋼板を積層した回転子鉄心の中心に回転軸が貫通し、前記回転軸の周囲に設けられた複数の挿入孔に瓦形の磁石が軸方向にそれぞれ埋設されたモータの回転子において、前記瓦形の磁石は、前記回転軸側に向かって膨らんだ部分が配され、前記瓦形の磁石における前記回転軸側の膨らんだ部分の曲率が、外周側のへこんだ部分の曲率より小さいことを特徴とする回転子である。   In the invention according to claim 1, the rotating shaft penetrates the center of the rotor core laminated with the steel plates, and the tile-shaped magnets are respectively embedded in the axial direction in the plurality of insertion holes provided around the rotating shaft. In the rotor of the motor, the tile-shaped magnet is provided with a portion that swells toward the rotating shaft side, and the curvature of the swelled portion on the rotating shaft side of the tile-shaped magnet is recessed on the outer peripheral side. The rotor is characterized by being smaller than the curvature of the part.

請求項２に係る発明は、前記瓦形の磁石が、分割された複数の磁石から構成されていることを特徴とする請求項１記載の回転子である。   The invention according to claim 2 is the rotor according to claim 1, wherein the tile-shaped magnet is composed of a plurality of divided magnets.

請求項３に係る発明は、鋼板を積層した回転子鉄心の中心に回転軸が貫通し、前記回転子鉄心の外周に設けられた複数の凹部に板形の磁石が軸方向にそれぞれ取り付けられたモータの回転子において、前記板形の磁石の前記回転軸側が膨らみ、かつ、この膨らんだ部分の先端部が直線形状であり、前記膨らんだ部分の先端部に対応する前記凹部の底部が直線形状であることを特徴とする回転子である。   In the invention according to claim 3, the rotating shaft penetrates through the center of the rotor core laminated with steel plates, and plate-shaped magnets are respectively attached in the axial direction to a plurality of recesses provided on the outer periphery of the rotor core. In the rotor of the motor, the rotating shaft side of the plate-shaped magnet swells, the tip of the swelled portion has a linear shape, and the bottom of the recess corresponding to the tip of the swelled portion has a linear shape It is a rotor characterized by being.

請求項４に係る発明は、前記モータがブラシレスＤＣモータであることを特徴とする請求項１または３記載の回転子である。   The invention according to claim 4 is the rotor according to claim 1 or 3, wherein the motor is a brushless DC motor.

請求項１に係る発明の回転子であると、瓦型の磁石における回転軸側の膨らんだ部分の曲率が外周側のへこんだ部分の曲率より小さくなるため、回転子の外形を拡大させることなく磁石のボリュームを大きくすることができ、マグネットフラックスを向上させることができる。   In the rotor according to the first aspect, the curvature of the swollen portion on the rotating shaft side of the tile-shaped magnet is smaller than the curvature of the recessed portion on the outer peripheral side, so that the outer shape of the rotor is not enlarged. The volume of the magnet can be increased and the magnet flux can be improved.

請求項３に係る発明の回転子であると、磁石の膨らんだ部分の先端部が直線形状であり、これに対応する回転子鉄心の外周部にある凹部の底部が直線形状であるため、位置決めを行うことができ、磁石が凹部内部で回転したりするのを防ぐことができるので傾いて固定されることがなく、バランスのとれた回転子を実現できる。   In the rotor according to the third aspect of the invention, the tip of the swelled portion of the magnet has a linear shape, and the bottom of the concave portion in the outer peripheral portion of the corresponding rotor core has a linear shape. Since the magnet can be prevented from rotating inside the concave portion, it is not tilted and fixed, and a balanced rotor can be realized.

［第１の実施形態］
以下、本発明の第１の実施形態の回転子１０について、図１及び図２に基づいて説明する。 [First Embodiment]
Hereinafter, the rotor 10 of the 1st Embodiment of this invention is demonstrated based on FIG.1 and FIG.2.

（１）モータ５０の構造
図１は、本実施形態の回転子１０を内蔵した三相のブラシレスＤＣモータ（以下、単にモータという）５０の縦断面図である。回転子１０を回転自在に内部に配置する固定子５２は、図１に示すようにリング状のコア部５４からＴ字状のティース５６が６本内周に向かって突出し、かつ、ティース５６には、絶縁層５８を介してコイル３０が巻回されている。 (1) Structure of Motor 50 FIG. 1 is a longitudinal sectional view of a three-phase brushless DC motor (hereinafter simply referred to as a motor) 50 incorporating the rotor 10 of the present embodiment. As shown in FIG. 1, the stator 52 that rotatably arranges the rotor 10 has six T-shaped teeth 56 projecting from the ring-shaped core portion 54 toward the inner periphery, and The coil 30 is wound around the insulating layer 58.

（２）回転子１０の構造
回転子１０は、円形の鋼板を積層して回転子鉄心１２が形成されている。この回転子鉄心１２の中心部には回転軸１４を貫通するための貫通孔１６が開口し、この貫通孔１６の外周部には瓦型の永久磁石２２をそれぞれ挿入するための挿入孔２０が６個軸方向に等間隔に６０°毎に貫通している。 (2) Structure of Rotor 10 The rotor 10 has a rotor core 12 formed by stacking circular steel plates. A through hole 16 for penetrating the rotating shaft 14 is opened at the center of the rotor core 12, and insertion holes 20 for inserting tile-shaped permanent magnets 22 are respectively inserted into the outer periphery of the through hole 16. Six pieces penetrate through every 60 ° at equal intervals in the axial direction.

瓦型の永久磁石２２の正面図を図２に示す。図２に示すように、瓦型の永久磁石２２の膨らんだ側の曲率Ｒ１は、へこんだ側の曲率Ｒ２より小さく、永久磁石２２の厚みにボリュームが出る形状となっている。このＲ１及びＲ２の曲率を構成する形状は、楕円や放物線形状とするのが好ましく、特に、へこんだ側の曲率を円弧状で形成し、膨らんだ側の曲率を放物線形状とするのが好ましい。そして、このような瓦型の永久磁石２２における膨らんだ側の部分を回転軸１４側に配置し、へこんだ側を外周側に配置する。   A front view of the tile-shaped permanent magnet 22 is shown in FIG. As shown in FIG. 2, the curvature R1 on the swell side of the tile-shaped permanent magnet 22 is smaller than the curvature R2 on the dented side, and the volume of the permanent magnet 22 is increased. The shape constituting the curvatures of R1 and R2 is preferably an ellipse or a parabola shape, and in particular, the concave side curvature is formed in an arc shape, and the bulging side curvature is preferably a parabola shape. And the part by the side of the swell in such a tile-shaped permanent magnet 22 is arrange | positioned at the rotating shaft 14 side, and the dented side is arrange | positioned at the outer peripheral side.

なお、挿入孔２０は、瓦型の永久磁石２２が挿入可能なように、その内径が瓦型をし、両端部には永久磁石２２の両端部を支持するための突起１８，１８が突出している。これによって、永久磁石２２が挿入孔２０内部で確実に位置決めされて固定される。   The insertion hole 20 has a roof-shaped inner diameter so that a roof-shaped permanent magnet 22 can be inserted, and projections 18 and 18 for supporting both ends of the permanent magnet 22 protrude from both ends. Yes. As a result, the permanent magnet 22 is reliably positioned and fixed inside the insertion hole 20.

（３）本実施形態の効果
上記のように、回転子鉄心１２の挿入孔２０に挿入されている瓦型の永久磁石２２において、回転軸側における膨らんだ部分の曲率Ｒ１が、外周側にあるへこんだ側の曲率Ｒ２よりも小さいことにより、永久磁石２２の厚みにボリュームが出て、回転子１０の外形を大きくすることなく限られたスペースの中でマグネットフラックスを向上させ、モータ特性を向上させることができる。 (3) Effects of this Embodiment As described above, in the tile-shaped permanent magnet 22 inserted into the insertion hole 20 of the rotor core 12, the curvature R1 of the swollen portion on the rotating shaft side is on the outer peripheral side. Since the curvature is smaller than the indented curvature R2, the volume of the permanent magnet 22 is increased, and the magnet flux is improved in a limited space without increasing the outer shape of the rotor 10, thereby improving the motor characteristics. Can be made.

［第２の実施形態］
次に、第２の実施形態の回転子１０について、図３及び図４に基づいて説明する。 [Second Embodiment]
Next, the rotor 10 of 2nd Embodiment is demonstrated based on FIG.3 and FIG.4.

瓦型の永久磁石を一体に成形する場合に、成形後の密度が不均一となりクラックが発生して、磁化方向が不均一になりモータ特性の低下の原因となる場合がある。   When a tile-shaped permanent magnet is formed integrally, the density after forming becomes non-uniform and cracks occur, and the magnetization direction becomes non-uniform, which may cause a decrease in motor characteristics.

これを解決するために、第１の実施形態では、永久磁石２２より一回り大きい永久磁石を型により製作し、その後切除と研磨によって所定の大きさの永久磁石２２を形成している。   In order to solve this, in the first embodiment, a permanent magnet that is slightly larger than the permanent magnet 22 is manufactured by a mold, and then the permanent magnet 22 having a predetermined size is formed by cutting and polishing.

しかしながら、この方法では、コストが掛かり、生産性が悪いという問題点がある。   However, this method has a problem that it is expensive and productivity is low.

そこで、第２の実施形態では、永久磁石２２を、図３に示すように、内周側磁石２４と外周側磁石２６とに分割して製作し、挿入孔２０に組み込むときに張り合わせて使用している。これにより、第１の実施形態のように後加工の工程が不要となり、生産性が向上する。   Therefore, in the second embodiment, as shown in FIG. 3, the permanent magnet 22 is manufactured by being divided into an inner peripheral side magnet 24 and an outer peripheral side magnet 26, and is used by attaching them to the insertion hole 20. ing. This eliminates the need for post-processing steps as in the first embodiment, and improves productivity.

なお、永久磁石２２を分割する方法としては、内周側磁石２４と外周側磁石２６とに分割する以外に、図５に示すように、周方向に沿って３分割してもよい。即ち、中央部磁石２８の両側に左側磁石３０と右側磁石３２を組み付ける。   In addition, as a method of dividing the permanent magnet 22, in addition to dividing the inner magnet 24 and the outer magnet 26, the permanent magnet 22 may be divided into three along the circumferential direction as shown in FIG. That is, the left magnet 30 and the right magnet 32 are assembled on both sides of the central magnet 28.

［第３の実施形態］
第３の実施形態の回転子１０について、図６及び図７に基づいて説明する。 [Third Embodiment]
A rotor 10 according to a third embodiment will be described with reference to FIGS. 6 and 7.

第３の実施形態の回転子１０は、第１の実施形態と第２の実施形態のＩＰＭ型の回転子とは異なり、回転子鉄心１２の外周部に６個の永久磁石３４を取り付ける。即ち、回転子鉄心１２の外周部には、軸方向に凹部３６が６個設けられており、この凹部３６に、永久磁石３４を接着するか、または、筒状のステンレス部材を被せる。   Unlike the IPM type rotors of the first and second embodiments, the rotor 10 of the third embodiment has six permanent magnets 34 attached to the outer periphery of the rotor core 12. That is, six recesses 36 are provided in the axial direction on the outer peripheral portion of the rotor core 12, and the permanent magnet 34 is bonded to the recess 36 or a cylindrical stainless steel member is covered.

永久磁石３４は、図６に示すように、外周側が円弧形をなし、内周側に膨らんだ部分が形成され、その先端部が直線形状３８となっている。一方、凹部３６の底部は、直線形状３８に対応するように、直線形状４０となっている。   As shown in FIG. 6, the permanent magnet 34 has an arc shape on the outer peripheral side, a portion that swells toward the inner peripheral side, and a linear shape 38 at the tip. On the other hand, the bottom of the recess 36 has a linear shape 40 so as to correspond to the linear shape 38.

そして、この直線形状３８と直線形状４０の部分が合うように凹部３６に永久磁石３４を固定する。このようにすることで従来問題となった凹部内部での永久磁石の回転や傾きなどがなくなり、所定の位置に確実に固定することができる。そのため、バランスのとれた回転子１０を実現することができる。   And the permanent magnet 34 is fixed to the recessed part 36 so that the part of this linear shape 38 and the linear shape 40 may match. By doing so, there is no rotation or inclination of the permanent magnet inside the recess, which has been a problem in the past, and it can be securely fixed at a predetermined position. Therefore, a balanced rotor 10 can be realized.

本発明は、小スペースで少しでもパワーアップの必要な電動工具用モータに好適である。   The present invention is suitable for a motor for an electric tool that requires a little power up in a small space.

本発明の第１の実施形態を示すモータの縦断面図である。It is a longitudinal cross-sectional view of the motor which shows the 1st Embodiment of this invention. 第１の実施形態の永久磁石の正面図である。It is a front view of the permanent magnet of a 1st embodiment. 第２の実施形態の永久磁石の正面図である。It is a front view of the permanent magnet of a 2nd embodiment. 第２の実施形態における回転子の縦断面図である。It is a longitudinal cross-sectional view of the rotor in 2nd Embodiment. 第２の実施形態における変更例の永久磁石の正面図である。It is a front view of the permanent magnet of the example of a change in 2nd Embodiment. 第３の実施形態の永久磁石の正面図である。It is a front view of the permanent magnet of 3rd Embodiment. 第３の実施形態の回転子の縦断面図である。It is a longitudinal cross-sectional view of the rotor of 3rd Embodiment. 第１の従来例の永久磁石の正面図である。It is a front view of the permanent magnet of the 1st conventional example. 第１の従来例の回転子の縦断面図である。It is a longitudinal cross-sectional view of the rotor of the 1st prior art example. 第２の従来例の永久磁石の正面図である。It is a front view of the permanent magnet of the 2nd prior art example. 第２の従来例の回転子の縦断面図である。It is a longitudinal cross-sectional view of the rotor of the 2nd prior art example.

符号の説明Explanation of symbols

１０ 回転子
１２ 回転子鉄心
１４ 回転軸
１６ 貫通孔
２０ 挿入孔
２２ 永久磁石
３６ 凹部
DESCRIPTION OF SYMBOLS 10 Rotor 12 Rotor core 14 Rotating shaft 16 Through-hole 20 Insertion hole 22 Permanent magnet 36 Recessed part

Claims (4)

鋼板を積層した回転子鉄心の中心に回転軸が貫通し、前記回転軸の周囲に設けられた複数の挿入孔に瓦形の磁石が軸方向にそれぞれ埋設されたモータの回転子において、
前記瓦形の磁石は、前記回転軸側に向かって膨らんだ部分が配され、
前記瓦形の磁石における前記回転軸側の膨らんだ部分の曲率が、外周側のへこんだ部分の曲率より小さい
ことを特徴とする回転子。 In a rotor of a motor in which a rotating shaft passes through the center of a rotor core laminated with steel plates, and tile-shaped magnets are embedded in the axial direction in a plurality of insertion holes provided around the rotating shaft,
The tile-shaped magnet is arranged with a portion swelled toward the rotating shaft side,
The rotator characterized in that the curvature of the swollen portion on the rotating shaft side of the tile-shaped magnet is smaller than the curvature of the recessed portion on the outer peripheral side. 前記瓦形の磁石が、分割された複数の磁石から構成されている
ことを特徴とする請求項１記載の回転子。 The rotor according to claim 1, wherein the tile-shaped magnet is composed of a plurality of divided magnets. 鋼板を積層した回転子鉄心の中心に回転軸が貫通し、前記回転子鉄心の外周に設けられた複数の凹部に板形の磁石が軸方向にそれぞれ取り付けられたモータの回転子において、
前記板形の磁石の前記回転軸側が膨らみ、かつ、この膨らんだ部分の先端部が直線形状であり、
前記膨らんだ部分の先端部に対応する前記凹部の底部が直線形状である
ことを特徴とする回転子。 In a rotor of a motor in which a rotating shaft passes through the center of a rotor core laminated with steel plates, and plate-shaped magnets are respectively attached to a plurality of concave portions provided on the outer periphery of the rotor core in the axial direction.
The rotary shaft side of the plate-shaped magnet swells, and the tip of the swelled portion is linear.
The rotor, wherein the bottom of the recess corresponding to the tip of the swollen portion has a linear shape. 前記モータがブラシレスＤＣモータである
ことを特徴とする請求項１または３記載の回転子。 The rotor according to claim 1, wherein the motor is a brushless DC motor.
JP2005147414A 2005-05-19 2005-05-19 Rotor Pending JP2006325348A (en)

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US10008893B2 (en) 2013-09-13 2018-06-26 Mitsubishi Electric Corporation Permanent magnet-embedded electric motor, compressor, and refrigerating and air-conditioning device
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JP2020150615A (en) * 2019-03-12 2020-09-17 日立グローバルライフソリューションズ株式会社 Motor and apparatus having the same

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7550889B2 (en) 2005-12-19 2009-06-23 Emerson Electric Co. Asymmetrical composite magnet structure for lobed rotor
EP1990895A3 (en) * 2007-05-09 2016-04-06 UQM Technologies, Inc. Stress distributing permanent magnet rotor geometry for electric machines
JP2010088296A (en) * 2008-10-02 2010-04-15 Emerson Electric Co Motor with robed rotor having even air gap and uneven air gap
JP2012228174A (en) * 2008-10-02 2012-11-15 Nidec Motor Corp Motor with lobed rotor having even air gap and uneven air gap
CN102457114A (en) * 2010-11-02 2012-05-16 株式会社安川电机 Rotary electric machine
JP2012100428A (en) * 2010-11-02 2012-05-24 Yaskawa Electric Corp Rotary electric machine
US8680732B2 (en) 2010-11-02 2014-03-25 Kabushiki Kaisha Yaskawa Denki Rotary electric machine
JP2012115142A (en) * 2010-11-26 2012-06-14 Siemens Ag Magnet for generator
JP2013132163A (en) * 2011-12-22 2013-07-04 Sharp Corp Permanent magnet motor
CN105743250A (en) * 2012-06-06 2016-07-06 日立空调·家用电器株式会社 Permanent Magnet Synchronous Machine
US10008893B2 (en) 2013-09-13 2018-06-26 Mitsubishi Electric Corporation Permanent magnet-embedded electric motor, compressor, and refrigerating and air-conditioning device
EP3046226B1 (en) * 2013-09-13 2018-07-25 Mitsubishi Electric Corporation Permanent magnet-embedded electric motor, compressor, and refrigerating and air-conditioning device
CN103986261B (en) * 2014-04-10 2016-06-08 西北工业大学 A kind of method improving PMSM Air Gap Flux waveform
CN103986261A (en) * 2014-04-10 2014-08-13 西北工业大学 Method for improving gap flux density waveform of permanent magnet synchronous motor
KR20190074792A (en) * 2017-12-20 2019-06-28 삼성전자주식회사 IPM BLDC Motor
EP3691087A4 (en) * 2017-12-20 2020-12-02 Samsung Electronics Co., Ltd. Ipm bldc motor
KR102509696B1 (en) * 2017-12-20 2023-03-15 삼성전자주식회사 IPM BLDC Motor
US11677284B2 (en) 2017-12-20 2023-06-13 Samsung Electronics Co., Ltd. IPM BLDC motor
JP2020150615A (en) * 2019-03-12 2020-09-17 日立グローバルライフソリューションズ株式会社 Motor and apparatus having the same
JP7169911B2 (en) 2019-03-12 2022-11-11 日立グローバルライフソリューションズ株式会社 Electric motors and equipment equipped with them

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