JP2005117760A

JP2005117760A - Motor rotor

Info

Publication number: JP2005117760A
Application number: JP2003347769A
Authority: JP
Inventors: Takeshi Nonaka; 剛野中; Mitsunori Kamo; 光則加茂
Original assignee: Yaskawa Electric Corp
Current assignee: Yaskawa Electric Corp
Priority date: 2003-10-07
Filing date: 2003-10-07
Publication date: 2005-04-28

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor structure for a motor which is resistant to centrifugal force by preventing a performance drop of the motor due to an increase of a magnetic gap or an increase of loss due to an eddy current. <P>SOLUTION: In the rotor for a motor, end faces on both sides in the axial directions of a split magnet 1 are provided with steps 1c and 1d, and the steps 1c and 1d are formed in ring-shaped grooves which are made inward in the axial direction of the magnet 1, and the scattering of the magnets can be prevented without fail by engaging retaining members 3c and 3d with the steps 1c and 1d. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、回転子に永久磁石よりなる分割磁石を有するモータの回転子の構造に関する。 The present invention relates to a structure of a rotor of a motor having a split magnet made of a permanent magnet in the rotor.

従来、永久磁石を有するモータの回転子は、磁石の磁力を高める１つの手段として、永久磁石よりなる分割磁石を個々に着磁すると共に、これらを接着により一体化してリング状の磁石となしているものが提案されている。
また、そのような分割磁石を持つ回転子では、磁石が遠心力で飛散するのを防止するために、磁石外周表面をテープ、フィルムあるいはキャン等からなる保持部材で覆ったものがある（例えば、特許文献１参照）。
図４は従来の分割磁石を有するモータの回転子の正断面図である。図４において、２１は４極で１６分割の構造をした磁石、２２は鋼製の回転軸、２３は磁石飛散防止用の保持部材である。
実開平５−５５７４３号公報（第２頁、第３図） Conventionally, a rotor of a motor having a permanent magnet, as one means for increasing the magnetic force of the magnet, individually magnetizes divided magnets made of permanent magnets and integrates them by bonding to form a ring-shaped magnet. What has been proposed.
Further, in such a rotor having divided magnets, there is one in which the outer peripheral surface of the magnet is covered with a holding member made of a tape, a film, a can or the like in order to prevent the magnet from being scattered by centrifugal force (for example, Patent Document 1).
FIG. 4 is a front sectional view of a rotor of a motor having a conventional divided magnet. In FIG. 4, 21 is a magnet having a structure of 4 poles and 16 divisions, 22 is a steel rotating shaft, and 23 is a holding member for preventing scattering of the magnet.
Japanese Utility Model Publication No. 5-55743 (2nd page, FIG. 3)

しかしながら、従来の分割磁石の飛散防止に用いられる保持部材は、回転子の外径の外周に設けながら固定子と回転子の機械的隙間を一定量確保する必要があるが、特に樹脂製の保持部材では遠心力による強度が弱いため、保持部材の厚みが大きくなり、その結果、磁気的隙間の増大により、モータの性能が低下するという問題があった。
他方、金属製の保持部材では比較的部材の厚みを小さくすることができ、固定子と回転子の機械的隙間の増大は軽減できるが、導電性であるため、渦電流による損失が増大するという問題があった。
本発明は上記問題を解決するためになされたものであり、磁気的隙間の増大によるモータの性能低下あるいは渦電流による損失の増大を防ぎ、遠心力による強度に強いモータの回転子構造を提供することを目的とする。 However, it is necessary to secure a certain amount of mechanical gap between the stator and the rotor while the conventional holding member used to prevent the divided magnets from being scattered is provided on the outer periphery of the outer diameter of the rotor. Since the strength of the member due to centrifugal force is weak, the thickness of the holding member increases, and as a result, there is a problem that the performance of the motor is reduced due to an increase in the magnetic gap.
On the other hand, with metal holding members, the thickness of the member can be made relatively small, and the increase in the mechanical gap between the stator and the rotor can be reduced, but since it is conductive, the loss due to eddy current increases. There was a problem.
The present invention has been made to solve the above problem, and provides a rotor structure of a motor that prevents a decrease in motor performance due to an increase in magnetic clearance or an increase in loss due to eddy currents and is strong against centrifugal force. For the purpose.

上記問題を解決するため、請求項１に記載の発明は、回転軸と、前記回転軸の外周に固定された複数個の磁極を有すると共に、該磁極が１極当り１個または複数個に分割された永久磁石からなる分割磁石と、を備えたモータの回転子において、前記分割磁石の軸方向における両側の端面に設けられた段差部と、前記段差部に嵌合された回転子の外径よりも小径の保持部材を設け設け、該保持部材により該分割磁石の飛散を防止するようにしたことを特徴としている。
請求項２の発明は、請求項１記載のモータの回転子において、前記段差部は該分割磁石の軸方向の内部に向かって形成されるようにリング状の溝形状を有することを特徴としている。
請求項３の発明は、請求項１または２に記載のモータの回転子において、前記保持部品は分割磁石の遠心力に耐えうる強度を有する樹脂または金属からなる部材であることを特徴としている。 In order to solve the above problem, the invention according to claim 1 has a rotating shaft and a plurality of magnetic poles fixed to the outer periphery of the rotating shaft, and the magnetic poles are divided into one or more per one pole. In a rotor of a motor comprising a split magnet made of a permanent magnet, a stepped portion provided on both end faces in the axial direction of the split magnet, and an outer diameter of the rotor fitted to the stepped portion Further, a holding member having a smaller diameter is provided, and scattering of the divided magnets is prevented by the holding member.
According to a second aspect of the present invention, in the rotor of the motor according to the first aspect, the step portion has a ring-shaped groove shape so as to be formed toward the inside of the divided magnet in the axial direction. .
According to a third aspect of the present invention, in the rotor of the motor according to the first or second aspect, the holding component is a member made of a resin or metal having a strength capable of withstanding the centrifugal force of the split magnet.

請求項１、３に記載の発明によれば、モータの回転子は、分割磁石の軸方向における両側の端面に設けられた段差部と、該段差部に嵌合された回転子の外径よりも小径の保持部材を有する構成にしたので、磁気的隙間の増大によるモータの性能低下、渦電流による損失の増大を引き起こすことなく、磁石の遠心力による飛散を防止することができる。
請求項２、３に記載の発明によれば、モータの回転子は、分割磁石の段差部が該磁石の軸方向の内部に向かって形成されるようにリング状の溝形状を有する構成にしたので、より確実に磁石の飛散を防止することができる。 According to the first and third aspects of the invention, the rotor of the motor includes a stepped portion provided on both end faces in the axial direction of the divided magnet and an outer diameter of the rotor fitted to the stepped portion. Since the structure has a small-diameter holding member, scattering due to the centrifugal force of the magnet can be prevented without causing a decrease in motor performance due to an increase in the magnetic gap and an increase in loss due to an eddy current.
According to the second and third aspects of the invention, the rotor of the motor has a ring-shaped groove shape so that the stepped portion of the divided magnet is formed toward the inside of the magnet in the axial direction. Therefore, it is possible to prevent the magnets from scattering more reliably.

以下、本発明の実施例を図に基づいて、具体的に説明する。 Embodiments of the present invention will be specifically described below with reference to the drawings.

図１は本発明の第１実施例を示すモータの回転子の側断面図、図２は図１に示すモータ回転子の分解斜視図である。
図において、１は分割磁石、１ａ、１ｂは段差部、２は回転軸、３ａ、３ｂは保持部材、４ａ、４ｂは軸受、５は固定子鉄心、６は電機子巻線、Ｒは回転子、Ｓは固定子である。
本発明の特徴は以下のとおりである。
すなわち、図１に示すモータの回転子において、分割磁石１の軸方向における両側の端面に設けられた段差部１ａ、１ｂと、段差部１ａ、１ｂに嵌合された回転子Ｒの外径よりも小径の保持部材３ａ、３ｂを有し、該保持部材３ａ、３ｂにより分割磁石１の飛散を防止するようにした点である。なお、保持部材３ａ、３ｂは分割磁石の遠心力に耐えうる強度を有する樹脂、または金属からなる部材で構成されている。
次に、回転子の組立について、図２を用いて説明する。鋼製の回転軸２の外周に複数の分割磁石１を放射方向に向かって嵌合すると共に、回転軸２に嵌合された分割磁石１の軸方向端面の両側に設けた段差部１ａ、１ｂに保持部材３ａ、３ｂを嵌め込み、接着材で固定する。これにより、保持部材３ａ、３ｂは軸受４ａと４ｂ側には移動することなく、接着材の剥がれ等による個々の磁石の飛散を防止する。
本発明の第１実施例はこのような構成にしたので、磁気的隙間の増大によるモータの性能低下も渦電流による損失の増大も引き起こすことなく、磁石の遠心力による飛散を防止することができる。 FIG. 1 is a sectional side view of a rotor of a motor according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the motor rotor shown in FIG.
In the figure, 1 is a divided magnet, 1a and 1b are stepped portions, 2 is a rotating shaft, 3a and 3b are holding members, 4a and 4b are bearings, 5 is a stator core, 6 is an armature winding, and R is a rotor. , S is a stator.
The features of the present invention are as follows.
That is, in the rotor of the motor shown in FIG. 1, the stepped portions 1 a and 1 b provided on both end surfaces in the axial direction of the divided magnet 1 and the outer diameter of the rotor R fitted to the stepped portions 1 a and 1 b. Also, the holding members 3a and 3b have small diameters, and the holding members 3a and 3b prevent the divided magnet 1 from scattering. The holding members 3a and 3b are made of a resin or metal member having a strength capable of withstanding the centrifugal force of the split magnet.
Next, the assembly of the rotor will be described with reference to FIG. Steps 1 a and 1 b provided on both sides of the axial end surface of the divided magnet 1 fitted to the rotating shaft 2 while fitting the plurality of divided magnets 1 radially toward the outer periphery of the steel rotating shaft 2. The holding members 3a and 3b are fitted in and fixed with an adhesive. Accordingly, the holding members 3a and 3b do not move toward the bearings 4a and 4b, and prevent the individual magnets from being scattered due to peeling of the adhesive or the like.
Since the first embodiment of the present invention has such a configuration, scattering due to the centrifugal force of the magnet can be prevented without causing a decrease in motor performance due to an increase in the magnetic gap and an increase in loss due to eddy current. .

図３は本発明の第２実施例を示すモータの回転子の側断面図である。
図３にいて、１ｃ、１ｄは段差部、３ｃ、３ｄは保持部材である。
第２実施例が第１実施例と異なる点は、分割磁石１の段差部１ｃ、１ｄが該磁石１の軸方向の内部に向かって形成されるようにリング状の溝形状を有する点である。
第２実施例はこのような構成にしたので、リング状の溝形状を有する段差部１ｃ、１ｄに保持部材３ｃ、３ｄを嵌合することで、第１実施例に比べてより確実に磁石の飛散を防止することができる。 FIG. 3 is a side sectional view of a rotor of a motor showing a second embodiment of the present invention.
In FIG. 3, 1c and 1d are step portions, and 3c and 3d are holding members.
The second embodiment is different from the first embodiment in that the stepped portions 1c and 1d of the split magnet 1 have a ring-shaped groove shape so as to be formed toward the inside of the magnet 1 in the axial direction. .
Since the second embodiment has such a configuration, the holding members 3c and 3d are fitted into the stepped portions 1c and 1d having ring-shaped groove shapes, so that the magnet can be more reliably compared to the first embodiment. Scattering can be prevented.

本発明の第１実施例を示すモータの回転子の側断面図1 is a side sectional view of a rotor of a motor showing a first embodiment of the present invention. 図１に示すモータ回転子の分解斜視図1 is an exploded perspective view of the motor rotor shown in FIG. 本発明の第２実施例を示すモータの回転子の側断面図Side sectional view of the rotor of the motor showing the second embodiment of the present invention. 従来の分割磁石を有するモータの回転子の正断面図Front sectional view of a rotor of a motor having a conventional divided magnet

Explanation of symbols

１分割磁石
１ａ、１ｂ、１ｃ、１ｄ段差部
２回転軸
３ａ、３ｂ、３ｃ、３ｄ保持部材
４ａ、４ｂ軸受
５固定子鉄心
６電機子巻線
Ｒ回転子
Ｓ固定子 1 Split magnet 1a, 1b, 1c, 1d Stepped portion 2 Rotating shaft 3a, 3b, 3c, 3d Holding member 4a, 4b Bearing 5 Stator core 6 Armature winding R Rotor S Stator

Claims

Rotation of a motor having a rotating shaft and a split magnet having a plurality of magnetic poles fixed to the outer periphery of the rotating shaft and a permanent magnet in which the magnetic pole is divided into one or more per pole In the child
A step portion provided on the axial end surface of the divided magnet and a holding member having a smaller diameter than the outer diameter of the rotor fitted to the step portion are provided, and the holding member prevents scattering of the divided magnet. The rotor of the motor characterized by the above.

2. The rotor of a motor according to claim 1, wherein the stepped portion has a ring-shaped groove shape so as to be formed toward the inside of the divided magnet in the axial direction.

3. The motor rotor according to claim 1, wherein the holding component is a resin or metal member having a strength capable of withstanding the centrifugal force of the divided magnet.