JP2021029062A - Rotor and motor - Google Patents

Rotor and motor Download PDF

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Publication number
JP2021029062A
JP2021029062A JP2019147126A JP2019147126A JP2021029062A JP 2021029062 A JP2021029062 A JP 2021029062A JP 2019147126 A JP2019147126 A JP 2019147126A JP 2019147126 A JP2019147126 A JP 2019147126A JP 2021029062 A JP2021029062 A JP 2021029062A
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Japan
Prior art keywords
support member
permanent magnet
holder
rotor
outer peripheral
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Pending
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JP2019147126A
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Japanese (ja)
Inventor
久志 福澤
Hisashi Fukuzawa
久志 福澤
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Nidec Sankyo Corp
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Nidec Sankyo Corp
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Priority to JP2019147126A priority Critical patent/JP2021029062A/en
Priority to CN202010796177.2A priority patent/CN112350475A/en
Publication of JP2021029062A publication Critical patent/JP2021029062A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders

Abstract

To provide a rotor capable of suppressing leakage of a magnetic flux from a permanent magnet in a motor axial direction and to provide a motor.SOLUTION: In a rotor 2 of a motor, a cylindrical permanent magnet 6 is fixed to an outer peripheral face 51 of a cylindrical holder 5 fixed around a rotation shaft 20, and the holder 5 is formed of a magnetic material. Thus, the holder 5 functions as a back yoke with respect to the permanent magnet 6. A first support member 7 formed of a non-magnetic material and a second support member 8 formed of a non-magnetic material are disposed on both sides in an axial direction L of the permanent magnet 6. Thus, a magnetic flux from the permanent magnet 6 is difficult to leak in the axial direction L where the first support member 7 and the second support member 8 are positioned. A flange part 53 on which the first support member 7 abuts from the other side Lb is installed on the holder 5 and the permanent magnet 6 abuts on the first support member 7 from the other side Lb.SELECTED DRAWING: Figure 2

Description

本発明は、回転軸に永久磁石が固定されたロータ、およびモータに関するものである。 The present invention relates to a rotor and a motor in which a permanent magnet is fixed to a rotating shaft.

モータは、回転軸の外周側に永久磁石を備えたロータと、ロータに対して回転磁界を発生させる環状のステータとを備えている。回転軸に永久磁石を設けるにあたって、ロータの外周面に円筒状部材が固定され、円筒状部材の外周面に円筒状の永久磁石が固定された構造が提案されている（特許文献１参照）。 The motor includes a rotor provided with a permanent magnet on the outer peripheral side of the rotating shaft, and an annular stator that generates a rotating magnetic field with respect to the rotor. In providing a permanent magnet on the rotating shaft, a structure has been proposed in which a cylindrical member is fixed to the outer peripheral surface of the rotor and a cylindrical permanent magnet is fixed to the outer peripheral surface of the cylindrical member (see Patent Document 1).

特許文献１に記載のロータにおいて、円筒状部材は、磁性材料からなるため、バックヨークとして機能する。また、特許文献１に記載のロータでは、円筒状部材において永久磁石より一方側にフランジ部を設け、フランジ部に永久磁石を他方側から当接させる一方、磁性材料からなる円環状部材を永久磁石に他方側から重なるように円筒状部材に固定することにより、円環状部材とフランジ部とによって永久磁石を軸線方向の両側から挟んだ構造としてある。 In the rotor described in Patent Document 1, since the cylindrical member is made of a magnetic material, it functions as a back yoke. Further, in the rotor described in Patent Document 1, a flange portion is provided on one side of the permanent magnet in the cylindrical member, the permanent magnet is brought into contact with the flange portion from the other side, and an annular member made of a magnetic material is a permanent magnet. By fixing to the cylindrical member so as to overlap from the other side, the permanent magnet is sandwiched from both sides in the axial direction by the annular member and the flange portion.

特開２０１９−０９２３５４号公報JP-A-2019-092354

特許文献１に記載の構成では、永久磁石の軸線方向の両側に磁性材料からなる円環状部材、および磁性材料からなる円筒状部材のフランジ部が存在するため、永久磁石からステータへの磁束の一部が軸線方向に漏れやすいという問題点がある。このような場合、永久磁石からステータへの磁束密度が低下するため、モータのトルク損失が大きくなる。 In the configuration described in Patent Document 1, since an annular member made of a magnetic material and a flange portion of a cylindrical member made of a magnetic material are present on both sides of the permanent magnet in the axial direction, one of the magnetic fluxes from the permanent magnet to the stator is present. There is a problem that the part easily leaks in the axial direction. In such a case, the magnetic flux density from the permanent magnet to the stator decreases, so that the torque loss of the motor increases.

以上の問題点に鑑みて、本願発明の課題は、永久磁石からの磁束がモータ軸線方向に漏れることを抑制することのできるロータ、およびモータを提供することにある。 In view of the above problems, an object of the present invention is to provide a rotor and a motor capable of suppressing leakage of magnetic flux from a permanent magnet in the motor axis direction.

上記課題を解決するために、本発明を適用したロータは、軸線方向の一方側から他方側に向けて延在する回転軸と、前記回転軸の周りに固定され、磁性材料からなる円筒状のホルダと、前記ホルダの外周面に固定された円筒状の永久磁石と、前記永久磁石に対して前記一方側で隣り合うように前記ホルダの前記外周面に保持され、非磁性材料からなる円環状の第１支持部材と、前記永久磁石に対して前記他方側で隣り合うように前記ホルダの前記外周面に保持され、非磁性材料からなる円環状の第２支持部材と、を有することを特徴とする。 In order to solve the above problems, the rotor to which the present invention is applied has a rotating shaft extending from one side in the axial direction to the other side, and a cylindrical shape fixed around the rotating shaft and made of a magnetic material. An annular shape made of a non-magnetic material, which is held on the outer peripheral surface of the holder so as to be adjacent to the holder, the cylindrical permanent magnet fixed to the outer peripheral surface of the holder, and the permanent magnet on one side. It is characterized by having a first support member of the above, and an annular second support member held on the outer peripheral surface of the holder so as to be adjacent to the permanent magnet on the other side and made of a non-magnetic material. And.

本発明では、回転軸の周りに固定された円筒状のホルダの外周面に円筒状の永久磁石が固定されており、ホルダは磁性材料からなる。このため、ホルダは、永久磁石に対するバックヨークとして機能する。これに対して、永久磁石の軸線方向の両側には、非磁性材料からなる第１支持部材、および非磁性材料からなる第２支持部材が設けられている。従って、永久磁石からの磁束が、第１支持部材および第２支持部材が位置する軸線方向に漏れにくい。 In the present invention, a cylindrical permanent magnet is fixed to the outer peripheral surface of a cylindrical holder fixed around a rotating shaft, and the holder is made of a magnetic material. Therefore, the holder functions as a back yoke for the permanent magnet. On the other hand, on both sides of the permanent magnet in the axial direction, a first support member made of a non-magnetic material and a second support member made of a non-magnetic material are provided. Therefore, the magnetic flux from the permanent magnet is unlikely to leak in the axial direction in which the first support member and the second support member are located.

本発明において、前記ホルダは、径方向外側に張り出して前記第１支持部材が前記他方
側から当接するフランジ部を有し、前記永久磁石は、前記第１支持部材に前記他方側から当接している態様を採用することができる。かかる態様によれば、永久磁石を軸線方向において確実に位置決めすることができるので、永久磁石の軸線方向Ｌの中央位置（磁気中心）の変動を抑制することができる。また、ホルダのフランジ部によって第１支持部材の位置決めを行うため、ホルダにおいて第１支持部材が配置される部分を細径にして、第１支持部材に対する位置決め用の段部を形成する必要がない。それ故、ホルダの一方側の端部を細径にする必要がないので、ホルダの一方側の端部の強度を高めることができる。また、ホルダに対して一方側から部材が当接しようとした際、部材は、フランジ部に当接し、第１支持部材に当たりにくい。従って、第１支持部材を介して永久磁石に力が加わることを防止することができる。 In the present invention, the holder has a flange portion that projects radially outward and the first support member abuts from the other side, and the permanent magnet abuts the first support member from the other side. Aspects can be adopted. According to this aspect, since the permanent magnet can be reliably positioned in the axial direction, fluctuations in the center position (magnetic center) of the permanent magnet in the axial direction L can be suppressed. Further, since the first support member is positioned by the flange portion of the holder, it is not necessary to reduce the diameter of the portion of the holder where the first support member is arranged to form a step portion for positioning with respect to the first support member. .. Therefore, it is not necessary to reduce the diameter of one end of the holder, so that the strength of one end of the holder can be increased. Further, when the member tries to come into contact with the holder from one side, the member comes into contact with the flange portion and is unlikely to hit the first support member. Therefore, it is possible to prevent the force from being applied to the permanent magnet via the first support member.

本発明において、前記ホルダは、前記他方側の端部が前記第２支持部材より前記他方側に位置する態様を採用することができる。かかる態様によれば、ホルダ周辺の軸線方向の寸法が第２支持部材によって長くなることを防止することができる。また、ホルダに対して他方側から部材が当接しようとした際、部材は、ホルダに当接し、第２支持部材に当たりにくい。従って、第２支持部材を介して永久磁石に力が加わることを防止することができる。 In the present invention, the holder can adopt an embodiment in which the other end is located on the other side of the second support member. According to such an aspect, it is possible to prevent the dimension in the axial direction around the holder from being lengthened by the second support member. Further, when the member tries to come into contact with the holder from the other side, the member comes into contact with the holder and is unlikely to hit the second support member. Therefore, it is possible to prevent the force from being applied to the permanent magnet via the second support member.

本発明において、前記ホルダの前記外周面では、前記他方側に向いた段部が周方向に延在し、前記第２支持部材が前記段部に前記他方側から当接して前記軸線方向で位置決めされた状態で、前記第２支持部材と前記永久磁石とは前記軸線方向で離間している態様を採用することができる。かかる態様によれば、第１支持部材の軸線方向の寸法、および永久磁石の軸線方向の寸法が多少、ばらついたときでも、第２支持部材の軸線方向の位置を段部によって規定することができる。 In the present invention, on the outer peripheral surface of the holder, a step portion facing the other side extends in the circumferential direction, and the second support member abuts on the step portion from the other side and is positioned in the axial direction. In this state, the second support member and the permanent magnet can be separated from each other in the axial direction. According to such an aspect, even when the axial dimension of the first support member and the axial dimension of the permanent magnet are slightly different, the axial position of the second support member can be defined by the step portion. ..

本発明において、前記永久磁石、前記第１支持部材および前記第２支持部材を径方向外側から被うように繊維シートが巻回され、前記繊維シートは、樹脂によって固められており、前記樹脂の一部は、前記第２支持部材と前記永久磁石との間に位置する態様を採用することができる。かかる態様によれば、ロータが高速回転する際に遠心力によって永久磁石が破壊することを樹脂で固めた繊維シートで抑制することができる。また、第２支持部材と第２端面との間に位置する樹脂によって、永久磁石の軸線方向への位置ずれを抑制することができる。従って、永久磁石の軸線方向の中央位置（磁気中心）の変動を抑制することができる。 In the present invention, the fiber sheet is wound so as to cover the permanent magnet, the first support member, and the second support member from the outside in the radial direction, and the fiber sheet is hardened with a resin, and the resin. A part can adopt an embodiment located between the second support member and the permanent magnet. According to this aspect, the destruction of the permanent magnet by the centrifugal force when the rotor rotates at high speed can be suppressed by the fiber sheet hardened with resin. Further, the resin located between the second support member and the second end surface can suppress the displacement of the permanent magnet in the axial direction. Therefore, fluctuations in the central position (magnetic center) of the permanent magnet in the axial direction can be suppressed.

本発明において、前記第２支持部材は、前記一方側の端部に位置する第１円環部と、前記第１円環部に前記他方側で隣接し、前記第１円環部より外径寸法が大きい第２円環部と、を備え、前記第１円環部の外周面、前記永久磁石の外周面、および前記第１支持部材の外周面は、前記第２円環部の外周面より径方向内側に凹んだ環状の凹部の底部を構成しており、前記凹部の内部で前記繊維シートが巻回されている態様を採用することができる。かかる態様によれば、繊維シートを多重に巻回した場合でも、繊維シートおよび樹脂が径方向外側にはみ出すことを抑制することができる。 In the present invention, the second support member is adjacent to the first annular portion located at the end of the one side and the first annular portion on the other side, and has an outer diameter from the first annular portion. A second annular portion having a large diameter is provided, and the outer peripheral surface of the first annular portion, the outer peripheral surface of the permanent magnet, and the outer peripheral surface of the first support member are the outer peripheral surfaces of the second annular portion. It is possible to adopt an embodiment in which the bottom portion of an annular recess recessed inward in the radial direction is formed, and the fiber sheet is wound inside the recess. According to such an aspect, even when the fiber sheet is wound multiple times, it is possible to prevent the fiber sheet and the resin from protruding outward in the radial direction.

本発明を適用したロータは、モータに用いることができ、この場合、モータは、前記永久磁石に対して径方向外側で対向するステータを備える。本発明を適用したロータでは、永久磁石からの磁束が軸線方向に漏れにくいため、ステータに向かう磁束密度を高めることができる。それ故、磁束の軸線方向への漏れに起因する損失を低減することができる。 A rotor to which the present invention is applied can be used in a motor, in which case the motor comprises a stator facing the permanent magnet radially outward. In the rotor to which the present invention is applied, the magnetic flux from the permanent magnet is unlikely to leak in the axial direction, so that the magnetic flux density toward the stator can be increased. Therefore, the loss caused by the leakage of the magnetic flux in the axial direction can be reduced.

本発明では、回転軸の周りに固定された円筒状のホルダの外周面に円筒状の永久磁石が固定されており、ホルダは磁性材料からなる。このため、ホルダは、永久磁石に対するバ
ックヨークとして機能する。これに対して、永久磁石の軸線方向の両側には、非磁性材料からなる第１支持部材、および非磁性材料からなる第２支持部材が設けられている。従って、永久磁石からの磁束が、第１支持部材および第２支持部材が位置する軸線方向に漏れにくい。 In the present invention, a cylindrical permanent magnet is fixed to the outer peripheral surface of a cylindrical holder fixed around a rotating shaft, and the holder is made of a magnetic material. Therefore, the holder functions as a back yoke for the permanent magnet. On the other hand, on both sides of the permanent magnet in the axial direction, a first support member made of a non-magnetic material and a second support member made of a non-magnetic material are provided. Therefore, the magnetic flux from the permanent magnet is unlikely to leak in the axial direction in which the first support member and the second support member are located.

本発明の実施形態に係るモータの一態様を示す説明図。Explanatory drawing which shows one aspect of the motor which concerns on embodiment of this invention. 図１に示すロータの斜視図。The perspective view of the rotor shown in FIG. 図２に示すロータの縦断面図。The vertical sectional view of the rotor shown in FIG.

以下、図面を参照しながら、本発明の例示的なロータおよびモータの実施形態を説明する。なお、以下の説明では、回転軸２０の軸線方向Ｌ（回転軸２０の中心軸線の延在方向）の一方側（反出力側）にＬａを付し、一方側Ｌａとは反対側の他方側（出力側）にＬｂを付して説明する。また。軸線を中心とした径方向を単に「径方向」とする。 Hereinafter, embodiments of an exemplary rotor and motor of the present invention will be described with reference to the drawings. In the following description, La is attached to one side (counter-output side) of the axial direction L of the rotating shaft 20 (the extending direction of the central axis of the rotating shaft 20), and the other side opposite to the one side La. It will be described with Lb attached to (output side). Also. The radial direction centered on the axis is simply referred to as the "diameter direction".

（全体構成）
図１は、本発明の実施形態に係るモータ１の一態様を示す説明図であり、図１には、モータ１を永久磁石６を通る位置でロータ２の軸線（軸線方向Ｌ）と直交する方向に切断した様子を模式的に示してある。図１に示すように、本形態のモータ１は、ロータ２と、ロータ２の径方向外側に配置された円筒状のステータ３と、ロータ２およびステータ３を収容する円筒状のケース４とを備える。ロータ２は、軸線方向Ｌの一方側Ｌａから他方側Ｌｂに向けて延在する回転軸２０を備えており、後述するように、回転軸２０の外周面２５には、円筒状のホルダ５、円筒状の永久磁石６、および保護層９が順に設けられている。 (overall structure)
FIG. 1 is an explanatory view showing an aspect of the motor 1 according to the embodiment of the present invention. FIG. 1 shows a position where the motor 1 passes through a permanent magnet 6 and is orthogonal to the axis line (axis direction L) of the rotor 2. The state of cutting in the direction is schematically shown. As shown in FIG. 1, the motor 1 of the present embodiment includes a rotor 2, a cylindrical stator 3 arranged radially outside the rotor 2, and a cylindrical case 4 accommodating the rotor 2 and the stator 3. Be prepared. The rotor 2 includes a rotating shaft 20 extending from one side La of the axial direction L toward the other side Lb, and as will be described later, a cylindrical holder 5 is provided on the outer peripheral surface 25 of the rotating shaft 20. A cylindrical permanent magnet 6 and a protective layer 9 are provided in this order.

ステータ３は、環状のステータコア３２を備えており、ステータコア３２は、径方向の内側に向けて突出する６つの突極３２０を備える。各突極３２０の先端面は、ロータ２の永久磁石６と所定の間隔を介して対向する。６つの突極３２０の各々にコイル３３が巻回される。ステータ３は、コイル３３への給電により、ロータ２に対して回転磁界を発生させる。これにより、ロータ２は、軸線を中心に回転することで、モータ１は回転軸２０から動力を出力する。 The stator 3 includes an annular stator core 32, which comprises six salient poles 320 projecting inward in the radial direction. The tip surface of each salient pole 320 faces the permanent magnet 6 of the rotor 2 at a predetermined distance. A coil 33 is wound around each of the six salient poles 320. The stator 3 generates a rotating magnetic field with respect to the rotor 2 by supplying power to the coil 33. As a result, the rotor 2 rotates about the axis, and the motor 1 outputs power from the rotating shaft 20.

（ロータ２の構成）
図２は、図１に示すロータ２の斜視図である。図３は、図２に示すロータ２の縦断面図である。図２および図３に示すように、ロータ２は、軸線方向Ｌの一方側Ｌａから他方側Ｌｂに向けて延在する回転軸２０と、回転軸２０の周りに固定された円筒状のホルダ５と、ホルダ５の外周面５１に接着等の方法で固定された円筒状の永久磁石６とを有している。ホルダ５は、回転軸２０の外周面２５に接着等の方法で固定されている。 (Structure of rotor 2)
FIG. 2 is a perspective view of the rotor 2 shown in FIG. FIG. 3 is a vertical cross-sectional view of the rotor 2 shown in FIG. As shown in FIGS. 2 and 3, the rotor 2 has a rotating shaft 20 extending from one side La in the axial direction L toward the other side Lb, and a cylindrical holder 5 fixed around the rotating shaft 20. And a cylindrical permanent magnet 6 fixed to the outer peripheral surface 51 of the holder 5 by a method such as adhesion. The holder 5 is fixed to the outer peripheral surface 25 of the rotating shaft 20 by a method such as adhesion.

回転軸２０は、外周面２５にホルダ５が保持された円柱状の軸本体部２３と、軸本体部２３の中心から一方側Ｌａに突出した第１軸部２１と、軸本体部２３の中心から他方側Ｌｂに突出した第２軸部２２とを備えている。第１軸部２１および第２軸部２２の外径寸法は同一であって、軸本体部２３の外径寸法より小さい。第１軸部２１および第２軸部２２は各々、軸受（図示せず）支持され、モータ１の出力は、第２軸部２２から出力される。軸本体部２３は、ホルダ５が保持された第１部分２３１が、第１部分２３１より一方側Ｌａの第２部分２３２より外経寸法が小さい。このため、第１部分２３１と第２部分２３２との間には、ホルダ５が他方側Ｌｂから当接する環状の段部２２３が形成されている。なお、本形態において、第１軸部２１および第２軸部２２の外径寸法は同一であるが、異なる寸法であってもよい。また、モータ１の出力は、第１軸部２１から出力される構成であってもよい。すなわち、回転軸２０の構成は、適宜変更可能である。 The rotating shaft 20 includes a cylindrical shaft body 23 in which the holder 5 is held on the outer peripheral surface 25, a first shaft 21 protruding from the center of the shaft body 23 to one side La, and the center of the shaft body 23. A second shaft portion 22 protruding from the other side Lb is provided. The outer diameter dimensions of the first shaft portion 21 and the second shaft portion 22 are the same, and are smaller than the outer diameter dimensions of the shaft main body portion 23. The first shaft portion 21 and the second shaft portion 22 are respectively supported by bearings (not shown), and the output of the motor 1 is output from the second shaft portion 22. In the shaft main body 23, the first portion 231 in which the holder 5 is held has a smaller outer diameter than the second portion 232 on one side La of the first portion 231. Therefore, an annular step portion 223 with which the holder 5 abuts from the other side Lb is formed between the first portion 231 and the second portion 232. In this embodiment, the outer diameter dimensions of the first shaft portion 21 and the second shaft portion 22 are the same, but may be different. Further, the output of the motor 1 may be configured to be output from the first shaft portion 21. That is, the configuration of the rotating shaft 20 can be changed as appropriate.

ホルダ５は、磁性材料からなり、永久磁石６に対するバックヨークとして機能する。より具体的には、ホルダ５は、磁性を有する金属材料からなる。例えば、ホルダ５は、Ｓ４５Ｃ等の炭素鋼鋼材からなる。 The holder 5 is made of a magnetic material and functions as a back yoke for the permanent magnet 6. More specifically, the holder 5 is made of a magnetic metal material. For example, the holder 5 is made of a carbon steel material such as S45C.

ホルダ５は、永久磁石６が固定された胴部５０の外径寸法が永久磁石６の内径寸法と略等しい。従って、永久磁石６は、ホルダ５の胴部５０に嵌合した状態で接着等の方法で固定されている。 In the holder 5, the outer diameter dimension of the body portion 50 to which the permanent magnet 6 is fixed is substantially equal to the inner diameter dimension of the permanent magnet 6. Therefore, the permanent magnet 6 is fixed to the body portion 50 of the holder 5 by a method such as adhesion in a state of being fitted.

ホルダ５の外周面５１には、永久磁石６の一方側Ｌａに位置する第１端面６１と対向する円環状の第１支持部材７が保持されている。また、ホルダ５の外周面５１には、永久磁石６の他方側Ｌｂに位置する第２端面６２と対向する円環状の第２支持部材８が保持されている。第１支持部材７および第２支持部材８は各々、ホルダ５に接着等の方法で固定されている。 An annular first support member 7 facing the first end surface 61 located on one side La of the permanent magnet 6 is held on the outer peripheral surface 51 of the holder 5. Further, the outer peripheral surface 51 of the holder 5 holds an annular second support member 8 facing the second end surface 62 located on the other side Lb of the permanent magnet 6. The first support member 7 and the second support member 8 are each fixed to the holder 5 by a method such as adhesion.

ここで、第１支持部材７、および第２支持部材８は各々、非磁性材料からなる。より具体的には、第１支持部材７、および第２支持部材８は各々、非磁性の金属材料からなる。例えば、第１支持部材７、および第２支持部材８は各々、ＳＵＳ３０４等のステンレス鋼からなる。 Here, the first support member 7 and the second support member 8 are each made of a non-magnetic material. More specifically, the first support member 7 and the second support member 8 are each made of a non-magnetic metal material. For example, the first support member 7 and the second support member 8 are each made of stainless steel such as SUS304.

ホルダ５は、胴部５０に対して一方側Ｌａに、径方向外側に張り出して第１支持部材７が他方側Ｌｂから当接する円環状のフランジ部５３を有している。従って、第１支持部材７は、フランジ部５３によって軸線方向Ｌで位置決めされている。本形態において、フランジ部５３は、ホルダ５の一方側Ｌａの端部から径方向外側に屈曲するように張り出している。ここで、フランジ部５３と胴部５０との間は、湾曲した屈曲部になっている。従って、第１支持部材７の内周面のうち、最も一方側Ｌａに位置する部分は、フランジ部５３と胴部５０との屈曲部を避けるように面取りされた形状になっている。 The holder 5 has an annular flange portion 53 on one side La with respect to the body portion 50, which projects outward in the radial direction and abuts the first support member 7 from the other side Lb. Therefore, the first support member 7 is positioned in the axial direction L by the flange portion 53. In this embodiment, the flange portion 53 projects so as to bend outward in the radial direction from the end portion of La on one side of the holder 5. Here, a curved bent portion is formed between the flange portion 53 and the body portion 50. Therefore, of the inner peripheral surface of the first support member 7, the portion located on one side La is chamfered so as to avoid the bent portion between the flange portion 53 and the body portion 50.

胴部５０は、フランジ部５３まで延在している。一方、第１支持部材７の内径寸法は、胴部５０の外径寸法と略等しい。従って、第１支持部材７は胴部５０に嵌合している。また、永久磁石６は、第１端面６１が第１支持部材７に他方側Ｌｂから当接している。従って、永久磁石６は、第１支持部材７によって軸線方向Ｌで位置決めされている。第１支持部材７の外径寸法は、永久磁石６の外径寸法と略等しく、フランジ部５３の外径寸法より小さい。従って、永久磁石６および第１支持部材７は、フランジ部５３の外周端より径方向内側に位置する。 The body portion 50 extends to the flange portion 53. On the other hand, the inner diameter dimension of the first support member 7 is substantially equal to the outer diameter dimension of the body portion 50. Therefore, the first support member 7 is fitted to the body portion 50. Further, in the permanent magnet 6, the first end surface 61 is in contact with the first support member 7 from the other side Lb. Therefore, the permanent magnet 6 is positioned in the axial direction L by the first support member 7. The outer diameter of the first support member 7 is substantially equal to the outer diameter of the permanent magnet 6 and smaller than the outer diameter of the flange 53. Therefore, the permanent magnet 6 and the first support member 7 are located radially inward from the outer peripheral end of the flange portion 53.

また、ホルダ５において、胴部５０に対して他方側Ｌｂでは、胴部５０より外径寸法が小さい細径部５４が延在している。従って、ホルダ５の外周面５１には、胴部５０と細径部５４との間に他方側Ｌｂに向いた円環状の段部５６が形成されている。一方、第２支持部材８の内径寸法は、細径部５４の外径寸法と略等しい。従って、第２支持部材８は、細径部５４に嵌合した状態で段部５６に他方側Ｌｂから当接し、段部５６によって軸線方向Ｌで位置決めされている。 Further, in the holder 5, a small diameter portion 54 having an outer diameter smaller than that of the body portion 50 extends on the other side Lb with respect to the body portion 50. Therefore, on the outer peripheral surface 51 of the holder 5, an annular step portion 56 facing the other side Lb is formed between the body portion 50 and the small diameter portion 54. On the other hand, the inner diameter dimension of the second support member 8 is substantially equal to the outer diameter dimension of the small diameter portion 54. Therefore, the second support member 8 abuts on the step portion 56 from the other side Lb in a state of being fitted to the small diameter portion 54, and is positioned by the step portion 56 in the axial direction L.

この状態で、第２支持部材８と永久磁石６の第２端面６２とは軸線方向Ｌで離間しており、第２支持部材８と永久磁石６の第２端面６２との間には環状の隙間１０が存在する。また、ホルダ５の他方側Ｌｂの端部５５は、第２支持部材８から他方側Ｌｂに突出し、第２支持部材８の他方側Ｌｂの端面８４より他方側Ｌｂに位置する。 In this state, the second support member 8 and the second end surface 62 of the permanent magnet 6 are separated from each other in the axial direction L, and the second support member 8 and the second end surface 62 of the permanent magnet 6 are annular. There is a gap 10. Further, the end portion 55 of the other side Lb of the holder 5 projects from the second support member 8 to the other side Lb, and is located on the other side Lb from the end surface 84 of the other side Lb of the second support member 8.

第２支持部材８において、一方側Ｌａに位置する第１円環部８１は、第１円環部８１の他方側Ｌｂに位置する第２円環部８２より径形寸法が小さく、永久磁石６の外径寸法と略
同じである。従って、第１支持部材７の外周面７０、永久磁石６の外周面６０、および第２支持部材８の第１円環部８１の外周面８１０は、フランジ部５３の外周面５３０および第２支持部材８の第２円環部８２の外周面８２０より径方向内側に凹んだ凹部２８の底部２８０を構成している。 In the second support member 8, the first annular portion 81 located on one side La has a smaller diameter than the second annular portion 82 located on the other side Lb of the first annular portion 81, and the permanent magnet 6 It is almost the same as the outer diameter dimension of. Therefore, the outer peripheral surface 70 of the first support member 7, the outer peripheral surface 60 of the permanent magnet 6, and the outer peripheral surface 810 of the first annular portion 81 of the second support member 8 are the outer peripheral surface 530 and the second support of the flange portion 53. The bottom portion 280 of the recess 28 recessed inward in the radial direction from the outer peripheral surface 820 of the second annular portion 82 of the member 8 is formed.

このように構成したロータ２には、永久磁石６、第１支持部材７および第２支持部材８を径方向外側から被うように保護層９が設けられている。 The rotor 2 configured in this way is provided with a protective layer 9 so as to cover the permanent magnet 6, the first support member 7, and the second support member 8 from the outside in the radial direction.

（保護層９の構成）
保護層９は、永久磁石６、第１支持部材７および第２支持部材８を径方向外側から被うように保護層９が設けられている。本形態において、永久磁石６、第１支持部材７および第２支持部材８を外周側から被うように繊維シート９１が巻回され、繊維シート９１は、樹脂９２によって固められている。より具体的には、保護層９では、特開２００９−１７７０８号公報および特開２０１９−０９２３５４号公報に開示されているように、保護層９は、炭素繊維が一方向に引き揃えられた繊維シート９１にエポキシ樹脂やフェノール樹脂等の熱硬化樹脂を含浸したプリプレグを巻回した後、加熱して、繊維シート９１を樹脂９２で固めた構造になっており、ロータ２が回転した際の遠心力を受けて永久磁石６が破損することを防止するとともに、永久磁石６が破損した際の飛散を防止する。 (Structure of protective layer 9)
The protective layer 9 is provided so as to cover the permanent magnet 6, the first support member 7, and the second support member 8 from the outside in the radial direction. In this embodiment, the fiber sheet 91 is wound so as to cover the permanent magnet 6, the first support member 7, and the second support member 8 from the outer peripheral side, and the fiber sheet 91 is hardened by the resin 92. More specifically, in the protective layer 9, as disclosed in JP-A-2009-17708 and JP-A-2019-092354, the protective layer 9 is a fiber in which carbon fibers are aligned in one direction. The sheet 91 is wound with a prepreg impregnated with a thermosetting resin such as an epoxy resin or a phenol resin, and then heated to harden the fiber sheet 91 with the resin 92. Centrifugation when the rotor 2 rotates It prevents the permanent magnet 6 from being damaged by receiving a force, and also prevents scattering when the permanent magnet 6 is damaged.

本形態において、繊維シート９１は、フランジ部５３の外周面５３０および第２支持部材８の第２円環部８２の外周面８２０より径方向内側に凹んだ凹部２８の内側に巻回されている。従って、繊維シート９１および樹脂９２は、第１支持部材７の外周面７０、永久磁石６の外周面６０、および第２支持部材８の第１円環部８１の外周面８１０を径方向外側から覆っており、凹部２８の内部から径方向外側にはみ出していない。 In the present embodiment, the fiber sheet 91 is wound inside a recess 28 recessed radially inward from the outer peripheral surface 530 of the flange portion 53 and the outer peripheral surface 820 of the second ring portion 82 of the second support member 8. .. Therefore, the fiber sheet 91 and the resin 92 form the outer peripheral surface 70 of the first support member 7, the outer peripheral surface 60 of the permanent magnet 6, and the outer peripheral surface 810 of the first annular portion 81 of the second support member 8 from the outside in the radial direction. It covers and does not protrude radially outward from the inside of the recess 28.

樹脂９２の一部９２０は、加熱時に第２支持部材８と永久磁石６の第２端面６２との間の隙間１０まで流入し、隙間１０に充填された状態にある。 A part of the resin 92, 920, flows into the gap 10 between the second support member 8 and the second end surface 62 of the permanent magnet 6 during heating, and is filled in the gap 10.

（ロータ２の製造方法）
本形態のロータ２を製造するにあたっては、回転軸２０の外周面２５に対して他方側Ｌｂからホルダ５、第１支持部材７、永久磁石６、および第２支持部材８を順に装着する。その際、必要な個所に接着剤を塗布し、部材同士を接着する。しかる後に保護層９を設ける。 (Manufacturing method of rotor 2)
In manufacturing the rotor 2 of this embodiment, the holder 5, the first support member 7, the permanent magnet 6, and the second support member 8 are sequentially mounted on the outer peripheral surface 25 of the rotating shaft 20 from the other side Lb. At that time, an adhesive is applied to the required parts to bond the members together. After that, the protective layer 9 is provided.

また、本形態のロータ２を製造するにあたっては、ホルダ５の外周面５１に、第１支持部材７、永久磁石６、および第２支持部材８を順に装着した後、保護層９を設け、しかる後に、回転軸２０の外周面２５に対して他方側Ｌｂからホルダ５を装着してもよい。この場合も、必要な個所に接着剤を塗布し、部材同士を接着する。 Further, in manufacturing the rotor 2 of this embodiment, the first support member 7, the permanent magnet 6, and the second support member 8 are sequentially mounted on the outer peripheral surface 51 of the holder 5, and then the protective layer 9 is provided. Later, the holder 5 may be mounted from the other side Lb with respect to the outer peripheral surface 25 of the rotating shaft 20. In this case as well, an adhesive is applied to the required parts to bond the members together.

（本形態の作用効果）
以上説明したように、本形態のロータ２およびモータ１においては、回転軸２０の周りに固定された円筒状のホルダ５の外周面５１に円筒状の永久磁石６が固定されており、ホルダ５は磁性材料からなる。このため、ホルダ５は、永久磁石６に対するバックヨークとして機能する。これに対して、永久磁石６の軸線方向Ｌの両側には、非磁性材料からなる第１支持部材７、および非磁性材料からなる第２支持部材８が設けられている。従って、永久磁石６からの磁束が、第１支持部材７および第２支持部材８が位置する軸線方向Ｌに漏れにくい。それ故、永久磁石６からステータ３に向かう磁束密度を高めることができるので、磁束の軸線方向への漏れに起因する損失を低減することができる。 (Action and effect of this form)
As described above, in the rotor 2 and the motor 1 of the present embodiment, the cylindrical permanent magnet 6 is fixed to the outer peripheral surface 51 of the cylindrical holder 5 fixed around the rotating shaft 20, and the holder 5 Is made of magnetic material. Therefore, the holder 5 functions as a back yoke for the permanent magnet 6. On the other hand, on both sides of the permanent magnet 6 in the axial direction L, a first support member 7 made of a non-magnetic material and a second support member 8 made of a non-magnetic material are provided. Therefore, the magnetic flux from the permanent magnet 6 is unlikely to leak in the axial direction L where the first support member 7 and the second support member 8 are located. Therefore, since the magnetic flux density from the permanent magnet 6 to the stator 3 can be increased, the loss due to the leakage of the magnetic flux in the axial direction can be reduced.

また、ホルダ５には、第１支持部材７が他方側Ｌｂから当接するフランジ部５３が設け
られ、第１支持部材７には永久磁石６が他方側Ｌｂから当接している。このため、永久磁石６を軸線方向Ｌにおいて確実に位置決めすることができるので、永久磁石６の軸線方向Ｌの中央位置（磁気中心）の変動を抑制することができる。また、ホルダ５のフランジ部５３によって第１支持部材７の位置決めを行うため、ホルダ５において第１支持部材７が配置される部分を細径にして、第１支持部材７に対する位置決め用の段部を形成する必要がない。それ故、ホルダ５の一方側Ｌａの端部を細径にする必要がないので、ホルダ５の一方側Ｌａの端部の強度を高めることができる。また、ホルダ５に対して一方側Ｌａから部材が当接しようとした際、部材は、フランジ部５３に当接し、第１支持部材７に当たりにくい。従って、第１支持部材７を介して永久磁石６に力が加わることを防止することができる。 Further, the holder 5 is provided with a flange portion 53 with which the first support member 7 comes into contact with the other side Lb, and the permanent magnet 6 comes into contact with the first support member 7 from the other side Lb. Therefore, since the permanent magnet 6 can be reliably positioned in the axial direction L, fluctuations in the center position (magnetic center) of the permanent magnet 6 in the axial direction L can be suppressed. Further, in order to position the first support member 7 by the flange portion 53 of the holder 5, the portion of the holder 5 where the first support member 7 is arranged is made smaller in diameter, and a step portion for positioning with respect to the first support member 7 There is no need to form. Therefore, it is not necessary to reduce the diameter of the end portion of one side La of the holder 5, so that the strength of the end portion of one side La of the holder 5 can be increased. Further, when the member tries to come into contact with the holder 5 from one side La, the member comes into contact with the flange portion 53 and is unlikely to hit the first support member 7. Therefore, it is possible to prevent the force from being applied to the permanent magnet 6 via the first support member 7.

また、ホルダ５は、他方側Ｌｂの端部５５が第２支持部材８より他方側Ｌｂに位置するため、ホルダ５周辺の軸線方向Ｌの寸法が第２支持部材８によって長くなることを防止することができる。また、ホルダ５に対して他方側Ｌｂから部材が当接しようとした際、部材は、ホルダ５に当接し、第２支持部材８に当たりにくい。従って、第２支持部材８を介して永久磁石６に力が加わることを防止することができる。また、ホルダ５の外周面５１では、他方側Ｌａに向いた段部５６に第２支持部材８が他方側Ｌｂから当接し、第２支持部材８と永久磁石６とは軸線方向Ｌで離間している。このため、第１支持部材７の軸線方向Ｌの寸法、および永久磁石６の軸線方向Ｌの寸法が多少、ばらついたときでも、第２支持部材８の軸線方向Ｌの位置を段部５６によって規定することができる。それ故、ホルダ５の他方側Ｌｂの端部５５を第２支持部材８より他方側Ｌｂに位置させることができる。 Further, in the holder 5, since the end portion 55 of the other side Lb is located on the other side Lb from the second support member 8, it is possible to prevent the dimension of the axial direction L around the holder 5 from being lengthened by the second support member 8. be able to. Further, when the member tries to come into contact with the holder 5 from the other side Lb, the member comes into contact with the holder 5 and is unlikely to hit the second support member 8. Therefore, it is possible to prevent the force from being applied to the permanent magnet 6 via the second support member 8. Further, on the outer peripheral surface 51 of the holder 5, the second support member 8 comes into contact with the stepped portion 56 facing the other side La from the other side Lb, and the second support member 8 and the permanent magnet 6 are separated from each other in the axial direction L. ing. Therefore, even when the axial direction L dimension of the first support member 7 and the axial direction L dimension of the permanent magnet 6 are slightly different, the position of the second support member 8 in the axial direction L is defined by the step portion 56. can do. Therefore, the end portion 55 of the other side Lb of the holder 5 can be positioned on the other side Lb of the second support member 8.

また、保護層９に用いた樹脂９２の一部９２０が、第２支持部材８と永久磁石６との間の隙間１０に充填された状態にあるので、永久磁石６の軸線方向Ｌへの位置ずれを抑制することができる。従って、永久磁石６の軸線方向Ｌの中央位置（磁気中心）の変動を抑制することができる。 Further, since a part 920 of the resin 92 used for the protective layer 9 is in a state of being filled in the gap 10 between the second support member 8 and the permanent magnet 6, the position of the permanent magnet 6 in the axial direction L The deviation can be suppressed. Therefore, fluctuations in the center position (magnetic center) of the permanent magnet 6 in the axial direction L can be suppressed.

１…モータ、２…ロータ、３…ステータ、４…ケース、５…ホルダ、６…永久磁石、７…第１支持部材、８…第２支持部材、９…保護層、１０…隙間、２０…回転軸、２８…凹部、３２…ステータコア、３３…コイル、５０…胴部、５３…フランジ部、５４…細径部、５５…端部、５６…段部、６１…第１端面、６２…第２端面、８１…第１円環部、８２…第２円環部、８４…端面、９１…繊維シート、９２…樹脂、２８０…底部、Ｌ…軸線方向、Ｌａ…一方側、Ｌｂ…他方側 1 ... motor, 2 ... rotor, 3 ... stator, 4 ... case, 5 ... holder, 6 ... permanent magnet, 7 ... first support member, 8 ... second support member, 9 ... protective layer, 10 ... gap, 20 ... Rotating shaft, 28 ... concave, 32 ... stator core, 33 ... coil, 50 ... body, 53 ... flange, 54 ... small diameter, 55 ... end, 56 ... step, 61 ... first end face, 62 ... 2 end face, 81 ... 1st ring part, 82 ... 2nd ring part, 84 ... end face, 91 ... fiber sheet, 92 ... resin, 280 ... bottom, L ... axial direction, La ... one side, Lb ... other side

Claims (7)

軸線方向の一方側から他方側に向けて延在する回転軸と、
前記回転軸の周りに固定され、磁性材料からなる円筒状のホルダと、
前記ホルダの外周面に固定された円筒状の永久磁石と、
前記永久磁石に対して前記一方側で隣り合うように前記ホルダの前記外周面に保持され、非磁性材料からなる円環状の第１支持部材と、
前記永久磁石に対して前記他方側で隣り合うように前記ホルダの前記外周面に保持され、非磁性材料からなる円環状の第２支持部材と、
を有することを特徴とするロータ。 A rotating shaft extending from one side to the other in the axial direction,
A cylindrical holder fixed around the rotating shaft and made of a magnetic material,
A cylindrical permanent magnet fixed to the outer peripheral surface of the holder,
An annular first support member held on the outer peripheral surface of the holder so as to be adjacent to the permanent magnet on one side and made of a non-magnetic material.
An annular second support member held on the outer peripheral surface of the holder so as to be adjacent to the permanent magnet on the other side and made of a non-magnetic material.
A rotor characterized by having. 請求項１に記載のロータにおいて、
前記ホルダは、径方向外側に張り出して前記第１支持部材が前記他方側から当接するフランジ部を有し、
前記永久磁石は、前記第１支持部材に前記他方側から当接していることを特徴とするロータ。 In the rotor according to claim 1,
The holder has a flange portion that projects outward in the radial direction and the first support member comes into contact with the other side.
The rotor is characterized in that the permanent magnet is in contact with the first support member from the other side. 請求項１または２に記載のロータにおいて、
前記ホルダは、前記他方側の端部が前記第２支持部材より前記他方側に位置することを特徴とするロータ。 In the rotor according to claim 1 or 2,
The holder is a rotor whose end on the other side is located on the other side of the second support member. 請求項１から３までの何れか一項に記載のロータにおいて、
前記ホルダの前記外周面では、前記他方側に向いた段部が周方向に延在し、
前記第２支持部材が前記段部に前記他方側から当接して前記軸線方向で位置決めされた状態で、前記第２支持部材と前記永久磁石とは前記軸線方向で離間していることを特徴とするロータ。 In the rotor according to any one of claims 1 to 3, the rotor
On the outer peripheral surface of the holder, a step portion facing the other side extends in the circumferential direction.
The second support member and the permanent magnet are separated from each other in the axial direction in a state where the second support member is in contact with the step portion from the other side and is positioned in the axial direction. Rotor to do. 請求項４に記載のロータにおいて、
前記永久磁石、前記第１支持部材および前記第２支持部材を径方向外側から被うように繊維シートが巻回され、
前記繊維シートは、樹脂によって固められており、
前記樹脂の一部は、前記第２支持部材と前記永久磁石との間に位置することを特徴とするロータ。 In the rotor according to claim 4,
The fiber sheet is wound so as to cover the permanent magnet, the first support member, and the second support member from the outside in the radial direction.
The fiber sheet is hardened with a resin and is hardened.
A rotor characterized in that a part of the resin is located between the second support member and the permanent magnet. 請求項５に記載のロータにおいて、
前記第２支持部材は、前記一方側に位置する第１円環部と、前記第１円環部に前記他方側で隣接し、前記第１円環部より外径寸法が大きい第２円環部と、を備え、
前記第１円環部の外周面、前記永久磁石の外周面、および前記第１支持部材の外周面は、前記第２円環部の外周面より径方向内側に凹んだ環状の凹部の底部を構成しており、
前記凹部の内部で前記繊維シートが巻回されていることを特徴とするロータ。 In the rotor according to claim 5,
The second support member has a first ring portion located on one side thereof and a second ring portion adjacent to the first ring portion on the other side and having an outer diameter larger than that of the first ring portion. With a department,
The outer peripheral surface of the first annular portion, the outer peripheral surface of the permanent magnet, and the outer peripheral surface of the first support member form the bottom of an annular recess recessed radially inward from the outer peripheral surface of the second annular portion. Consists and
A rotor characterized in that the fiber sheet is wound inside the recess. 請求項１から６までの何れか一項に記載のロータと、
前記永久磁石に対して径方向外側で対向するステータと、
を備えることを特徴とするモータ。 The rotor according to any one of claims 1 to 6,
A stator facing the permanent magnet on the outer side in the radial direction,
A motor characterized by being equipped with.
JP2019147126A 2019-08-09 2019-08-09 Rotor and motor Pending JP2021029062A (en)

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US4633113A (en) * 1985-10-16 1986-12-30 Sundstrand Corporation Side plate construction for permanent magnet rotor
US7965009B2 (en) * 2006-10-17 2011-06-21 Sanyo Denki Co., Ltd. Motor rotor and manufacturing method thereof
US8415854B2 (en) * 2008-07-28 2013-04-09 Direct Drive Systems, Inc. Stator for an electric machine
US9859761B2 (en) * 2013-02-12 2018-01-02 Asmo Co., Ltd. Rotor and motor
US11489385B2 (en) * 2017-05-29 2022-11-01 Mitsubishi Electric Corporation Rotor, rotary electric machine, and method for manufacturing rotor

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