JPH11234931A - Permanent magnet-incorporated rotary electric machine - Google Patents

Permanent magnet-incorporated rotary electric machine

Info

Publication number
JPH11234931A
JPH11234931A JP3731798A JP3731798A JPH11234931A JP H11234931 A JPH11234931 A JP H11234931A JP 3731798 A JP3731798 A JP 3731798A JP 3731798 A JP3731798 A JP 3731798A JP H11234931 A JPH11234931 A JP H11234931A
Authority
JP
Japan
Prior art keywords
permanent magnet
core
axial
rotor
electric machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3731798A
Other languages
Japanese (ja)
Inventor
Manabu Sasaki
学 佐々木
Kazuo Tawara
和雄 田原
Kazuo Sato
和雄 佐藤
Original Assignee
Hitachi Ltd
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, 株式会社日立製作所 filed Critical Hitachi Ltd
Priority to JP3731798A priority Critical patent/JPH11234931A/en
Publication of JPH11234931A publication Critical patent/JPH11234931A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet-incorporated rotary electric machine, which can reduce an iron loss by preventing local magnetic saturation of a stator iron core, can avoid the magnetic flux leakage due to magnetic saturation, and which causes no surplus of the stator iron core or a rotor iron core. SOLUTION: The axial length of an outside part 8' of a rotor iron core 8 formed on the outside of permanent magnets 9 embedded in a plurality of punched holes 7 formed in the axial direction of the rotor iron core 8 is longer than the axial length of the permanent magnets 9 and is nearly the same as the axial length of a stator iron core 2. Because of this structure, magnetic flux from the permanent magnets 9 passes through the outside part 8' of the rotor iron core 8 and is diffused toward the ends in the axial direction of the stator iron core 2, thereby preventing local magnetic saturation of the stator iron core 2 and reducing an iron loss.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は、回転子鉄心に永久
磁石を有する回転子を備えた永久磁石式回転電機に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type rotating electric machine having a rotor having a permanent magnet on a rotor core.
【0002】[0002]
【従来の技術】永久磁石式回転電機は、工作機械やロボ
ット等の位置制御および速度制御を必要とする駆動力源
として採用されている。
2. Description of the Related Art A permanent magnet type rotating electric machine is employed as a driving force source that requires position control and speed control of a machine tool, a robot, and the like.
【0003】従来、高磁束密度の永久磁石、例えばネオ
ジム磁石を用いた永久磁石式回転電機では、特開昭60-1
76432号公報に記載のように、固定子鉄心の積厚長を回
転子鉄心の積厚長より長くすることにより、固定子鉄心
での磁気飽和を防いでいた。
Conventionally, a permanent magnet type rotating electric machine using a permanent magnet having a high magnetic flux density, for example, a neodymium magnet, is disclosed in
As described in Japanese Patent No. 76432, magnetic saturation in the stator core is prevented by making the stack length of the stator core longer than the stack length of the rotor core.
【0004】また、永久磁石にフェライト磁石を用いた
永久磁石式回転電機では、回転子鉄心の積厚長を固定子
鉄心の積厚長より長くすることにより、磁束を固定子鉄
心に集め、誘導起電力を大きくし、モータの高効率化を
図っていた。
Further, in a permanent magnet type rotating electric machine using a ferrite magnet as a permanent magnet, the magnetic flux is collected on the stator core by guiding the magnetic flux to the stator core by making the thickness of the rotor core longer than that of the stator core. The electromotive force was increased to improve the efficiency of the motor.
【0005】また、特開平6-225507号公報記載の永久磁
石式回転電機では、固定子鉄心及び回転子鉄心の軸方向
の長さを同一とし、これら固定子鉄心及び回転子鉄心の
軸方向の長さを永久磁石の軸方向全長よりも長くするこ
とにより、電磁振動音の原因となるPWM通電時の電流
リップルを小さくしていた。
In the permanent magnet type rotating electric machine described in Japanese Patent Application Laid-Open No. 6-225507, the stator core and the rotor core have the same axial length, and the stator core and the rotor core have the same axial length. By making the length longer than the total length of the permanent magnet in the axial direction, the current ripple at the time of PWM energization which causes electromagnetic vibration noise is reduced.
【0006】[0006]
【発明が解決しようとする課題】上述した特開昭60-176
432号公報に記載の永久磁石式回転電機では、固定子鉄
心の磁気飽和は多少緩和されるが、回転子鉄心の軸方向
の長さが永久磁石の軸方向の長さと等しく、固定子鉄心
の長さより短いために、固定子鉄心に入った磁束が、最
短距離で通過しようとすること、及び軸方向に積層され
ているために、固定子鉄心の軸方向の端部に磁束が拡散
せずに、軸方向中心部分に磁束が集中する局部的な磁気
飽和の問題があり、この結果、固定子鉄心の鉄損が増大
していた。
Problems to be Solved by the Invention
In the permanent magnet type rotating electric machine described in Japanese Patent No. 432, the magnetic saturation of the stator core is somewhat reduced, but the axial length of the rotor core is equal to the axial length of the permanent magnet, and the stator core Because the length is shorter than the length, the magnetic flux entering the stator core tries to pass through the shortest distance, and because it is laminated in the axial direction, the magnetic flux does not diffuse to the axial end of the stator core. In addition, there is a problem of local magnetic saturation in which magnetic flux is concentrated at a central portion in the axial direction, and as a result, iron loss of the stator core has increased.
【0007】また、上述した特開平6-225507号公報記載
の永久磁石式回転電機では、回転子鉄心の軸方向の長さ
が永久磁石の軸方向の長さより長いが、回転子鉄心が永
久磁石の内径側に位置しているため、特開昭60-176432
号公報に記載されている構成の永久磁石式回転電機と同
様に、固定子鉄心の局部的な磁気飽和の問題があり、こ
の結果、固定子鉄心の鉄損が増大していた。
In the permanent magnet type rotating electric machine described in Japanese Patent Application Laid-Open No. 6-225507, although the axial length of the rotor core is longer than the axial length of the permanent magnet, the rotor core is Because it is located on the inner diameter side of
As in the case of the permanent magnet type rotating electric machine having the configuration described in Japanese Patent Application Laid-Open Publication No. H10-207, there is a problem of local magnetic saturation of the stator core, and as a result, iron loss of the stator core has increased.
【0008】また、特開昭60-176432号公報に記載され
ている構成及び永久磁石にフェライト磁石を用いた永久
磁石式回転電機においては、固定子鉄心の軸方向の長さ
が回転子鉄心の軸方向の長さより長いため、固定子鉄心
及び回転子鉄心を同時打ち抜きで製造する場合、回転子
鉄心に余剰が生じるという問題があった。
Further, in a configuration described in Japanese Patent Application Laid-Open No. 60-176432 and a permanent magnet type rotating electric machine using a ferrite magnet as a permanent magnet, the axial length of the stator core is equal to that of the rotor core. Since the length is longer than the axial length, when the stator core and the rotor core are manufactured by simultaneous punching, there is a problem that the rotor core has a surplus.
【0009】また、永久磁石にフェライト磁石を用いた
永久磁石式回転電機においては、回転子鉄心の軸方向の
長さが固定子鉄心の軸方向の長さより長いために、固定
子鉄心及び回転子鉄心を同時打ち抜きで製造する場合、
固定子鉄心に余剰が生じるという問題があった。
In a permanent magnet type rotating electric machine using a ferrite magnet as the permanent magnet, the axial length of the rotor core is longer than the axial length of the stator core. When manufacturing iron core by simultaneous punching,
There was a problem that a surplus occurred in the stator core.
【0010】本発明の目的は、上記問題を解決すべく、
固定子鉄心の局部的な磁気飽和を防いで鉄損を減らすと
共に磁気飽和による磁束の漏れを防ぎ、かつ固定子鉄心
または回転子鉄心の余剰を生じさせない永久磁石式回転
電機を提供することにある。
[0010] An object of the present invention is to solve the above problems.
It is an object of the present invention to provide a permanent magnet type rotating electric machine which prevents local magnetic saturation of a stator core, reduces iron loss, prevents magnetic flux leakage due to magnetic saturation, and does not generate excess stator core or rotor core. .
【0011】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明における永久磁石式回転電機の特徴とすると
ころは、回転子鉄心の軸方向に形成された複数の打抜穴
に埋め込まれた永久磁石より外周側に外周側回転子鉄心
を形成し、該外周側回転子鉄心の軸方向の長さを、永久
磁石の軸方向の長さより長くすることにより、永久磁石
からの磁束を外周側回転子鉄心を介して固定子鉄心の軸
方向端部へ拡散させることにある。
In order to achieve the above object, a feature of the permanent magnet type rotating electric machine according to the present invention is that it is embedded in a plurality of punched holes formed in the axial direction of a rotor core. An outer rotor core is formed on the outer peripheral side of the permanent magnet, and the axial length of the outer rotor core is made longer than the axial length of the permanent magnet so that the magnetic flux from the permanent magnet is The purpose is to diffuse the stator core through the side rotor core to the axial end.
【0012】具体的には、本発明は次に掲げる永久磁石
式回転電機を提供する。
More specifically, the present invention provides the following permanent magnet type rotating electric machine.
【0013】本発明は、固定子巻線を巻回した固定子鉄
心を有する固定子と、該固定子鉄心と所定のギャップを
有して回転可能に対向し、永久磁石を内蔵する回転子鉄
心を有する回転子とを有し、前記固定子巻線に通電する
ことにより前記回転子を回転駆動させる永久磁石式回転
電機において、前記回転子鉄心の軸方向に形成された複
数の打抜穴に埋め込まれた前記永久磁石より外周側に外
周側回転子鉄心を形成し、前記外周側回転子鉄心の軸方
向の長さを前記永久磁石の軸方向の長さより長くして、
前記永久磁石からの磁束を前記外周側回転子鉄心を介し
て前記固定子鉄心の軸方向端部へ拡散させることを特徴
とする永久磁石式回転電機を提供する。
The present invention provides a stator having a stator core wound with a stator winding, a rotor core rotatably facing the stator core with a predetermined gap, and incorporating a permanent magnet. In a permanent magnet type rotating electric machine that rotationally drives the rotor by energizing the stator winding, a plurality of punched holes formed in the axial direction of the rotor core are provided. Forming an outer peripheral rotor core on the outer peripheral side of the embedded permanent magnet, making the axial length of the outer peripheral rotor core longer than the axial length of the permanent magnet;
A permanent magnet type rotating electric machine is characterized in that a magnetic flux from the permanent magnet is diffused to an axial end of the stator core via the outer rotor core.
【0014】また、本発明は、固定子巻線を巻回した固
定子鉄心を有する固定子と、該固定子鉄心と所定のギャ
ップを有して回転可能に対向し、永久磁石を内蔵する回
転子鉄心を有する回転子とを有し、前記固定子巻線に通
電することにより前記回転子を回転駆動させる永久磁石
式回転電機において、前記回転子鉄心の軸方向に形成さ
れた複数の打抜穴に埋め込まれた前記永久磁石より外周
側に外周側回転子鉄心を形成し、前記外周側回転子鉄心
の軸方向の長さを、前記永久磁石の軸方向の長さより長
くし、かつ前記固定子鉄心の軸方向の長さとほぼ同じに
して、前記永久磁石からの磁束を前記外周側回転子鉄心
を介して前記固定子鉄心の軸方向端部へ拡散させること
を特徴とする永久磁石式回転電機を提供する。
According to the present invention, there is provided a stator having a stator core wound with a stator winding, and a rotor rotatably opposed to the stator core with a predetermined gap and having a built-in permanent magnet. And a rotor having a rotor core, wherein a plurality of punches formed in the axial direction of the rotor core are provided in a permanent magnet type rotating electric machine that rotates the rotor by energizing the stator winding. Forming an outer peripheral rotor core on the outer peripheral side of the permanent magnet embedded in the hole, making the axial length of the outer peripheral rotor core longer than the axial length of the permanent magnet, and A permanent magnet type rotation, wherein the magnetic flux from the permanent magnet is diffused to the axial end of the stator core through the outer peripheral rotor core with substantially the same length as the axial length of the stator core. Provide electric machinery.
【0015】好ましくは、前記各打抜穴の前記永久磁石
の外側に、前記永久磁石に隣接させて前記永久磁石の軸
方向の長さより軸方向の長さが長い塊状鉄心を埋め込
む。
[0015] Preferably, a massive iron core having an axial length longer than the axial length of the permanent magnet is embedded adjacent to the permanent magnet outside the permanent magnet in each of the punched holes.
【0016】好ましくは、前記回転子を、前記回転子鉄
心と、該回転子鉄心の軸方向の両端に装着された補助鉄
心とで構成し、前記補助鉄心を、略リング状に形成し、
前記補助鉄心の略リングの内周面が前記永久磁石の外側
に位置し、前記略リングの外周面が、前記回転子鉄心の
外周面と同じ位置になるように装着する。
Preferably, the rotor comprises the rotor core and auxiliary iron cores mounted on both ends in the axial direction of the rotor iron core, and the auxiliary iron core is formed in a substantially ring shape.
The auxiliary core is mounted such that the inner peripheral surface of the substantially ring is located outside the permanent magnet, and the outer peripheral surface of the substantially ring is at the same position as the outer peripheral surface of the rotor core.
【0017】好ましくは、前記永久磁石を、該永久磁石
の軸方向に少なくとも一個以上に分割する。
[0017] Preferably, the permanent magnet is divided into at least one or more in the axial direction of the permanent magnet.
【0018】本発明によれば、回転子鉄心の軸方向に形
成された複数の打抜穴に埋め込まれた永久磁石より外周
側に外周側回転子鉄心を形成し、外周側回転子鉄心の軸
方向の長さを、永久磁石の軸方向の長さより長くし、か
つ固定子鉄心の軸方向の長さとほぼ同じ長さにする。
According to the present invention, the outer peripheral side rotor core is formed on the outer peripheral side from the permanent magnets embedded in the plurality of punched holes formed in the axial direction of the rotor core, and the outer peripheral side rotor core is formed. The length in the direction is longer than the length in the axial direction of the permanent magnet, and is substantially the same as the length in the axial direction of the stator core.
【0019】これにより、永久磁石からの磁束が、永久
磁石より外周側回転子鉄心を通り、固定子鉄心の軸方向
端部へ拡散される。この結果、固定子鉄心の局部的な磁
気飽和が防げ鉄損を減らすことができ、かつ磁気飽和に
よる磁束の漏れが防げて誘導起電力を大きくでき、モー
タ効率を向上させることができる。
Thus, the magnetic flux from the permanent magnet passes through the rotor core on the outer peripheral side from the permanent magnet and is diffused to the axial end of the stator core. As a result, local magnetic saturation of the stator core can be prevented, iron loss can be reduced, and leakage of magnetic flux due to magnetic saturation can be prevented, induced electromotive force can be increased, and motor efficiency can be improved.
【0020】また、回転子鉄心の軸方向の長さを、固定
子鉄心の軸方向の長さとほぼ同じ長さにすることによ
り、両鉄心材の同時打ち抜きが可能となり、固定子鉄心
及び回転子鉄心に余剰を生じさせることなく、資源の有
効利用を図ることができる。
Further, by making the axial length of the rotor core substantially the same as the axial length of the stator core, simultaneous punching of both core materials becomes possible, and the stator core and the rotor Resources can be effectively used without causing a surplus in the iron core.
【0021】[0021]
【発明の実施の形態】以下、本発明の実施の形態例に係
る永久磁石式回転電機を、図を用いて説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A permanent magnet type rotating electric machine according to an embodiment of the present invention will be described below with reference to the drawings.
【0022】図1は、本発明の第一の実施の形態例に係
る永久磁石式回転電機の軸方向断面図である。図2は、
図1のA−Aの縦断面図であり、図3は、図1のB−B
の縦断面図である。
FIG. 1 is an axial sectional view of a permanent magnet type rotating electric machine according to a first embodiment of the present invention. FIG.
FIG. 3 is a longitudinal sectional view taken along the line AA of FIG. 1, and FIG.
FIG.
【0023】図1〜図3において、永久磁石式回転電機
は、回転子6と固定子1を含み構成される。回転子6
は、打抜穴7を有する積層形成した回転子鉄心8と、打
抜穴7を有さない両端に設ける非磁性材の端板8a,8
bと、打抜穴7に埋め込まれた永久磁石9とで構成され
ている。また、永久磁石9より外周側に、回転子鉄心8
の一部分であり、かつ永久磁石9より軸方向に長い外周
側回転子鉄心8'が形成されている。
1 to 3, the permanent magnet type rotating electric machine includes a rotor 6 and a stator 1. Rotor 6
Are laminated rotor cores 8 having punched holes 7, and end plates 8a, 8 of non-magnetic material provided at both ends having no punched holes 7.
b and a permanent magnet 9 embedded in the punched hole 7. Further, the rotor core 8 is located on the outer peripheral side of the permanent magnet 9.
And an outer rotor core 8 ′ which is longer than the permanent magnet 9 in the axial direction.
【0024】打抜穴7に永久磁石9を埋め込み、それを
両端から端板8a,8bでリベット等(図示せず)で固
着し、これにシャフト10を挿入する。そして、シャフ
ト10の両端側に嵌合したベアリング5a,5bをエンド
ブラケット4a,4bで支持する構成となっている。
A permanent magnet 9 is embedded in the punched hole 7, and is fixed from both ends by end plates 8a and 8b with rivets or the like (not shown), and a shaft 10 is inserted into this. The bearings 5a and 5b fitted to both ends of the shaft 10 are supported by end brackets 4a and 4b.
【0025】一方、固定子1は、フレーム12の内周側
に積層形成した固定子鉄心2を備え、固定子鉄心2の固
定子スロット(図示せず)内に、固定子巻線3を巻回し
たもので構成されている。そして、エンドブラケット4
a,4bをボルト(図示せず)でフレーム12に固定する
ことにより、回転子6が固定子1の内周側に所定のギャ
ップ長を介して回転自在に支持される構成となってい
る。
On the other hand, the stator 1 includes a stator core 2 laminated on the inner peripheral side of the frame 12, and a stator winding 3 is wound in a stator slot (not shown) of the stator core 2. It is made up of turned things. And end bracket 4
By fixing a and 4b to the frame 12 with bolts (not shown), the rotor 6 is rotatably supported on the inner peripheral side of the stator 1 via a predetermined gap length.
【0026】図2に示すように、回転子鉄心8は、打抜
穴7、シャフト穴10a、リベット穴10bを有してお
り、打抜穴7には永久磁石9が、シャフト穴10aには
シャフト10が、リベット穴10bには、リベット(図
示せず)が挿入されている。
As shown in FIG. 2, the rotor core 8 has a punched hole 7, a shaft hole 10a, and a rivet hole 10b. A permanent magnet 9 is provided in the punched hole 7 and a permanent magnet 9 is provided in the shaft hole 10a. A rivet (not shown) is inserted into the rivet hole 10b of the shaft 10.
【0027】図2、図3の違いは、図2は、回転子鉄心
8の打抜穴7に永久磁石9があり、図3では、打抜穴7
が空隙、もしくは非磁性材あるいは絶縁材で満たされた
部分となる。
The difference between FIGS. 2 and 3 is that, in FIG. 2, a permanent magnet 9 is provided in a punched hole 7 of a rotor core 8, and in FIG.
Is a void or a portion filled with a nonmagnetic material or an insulating material.
【0028】図4に、従来例の永久磁石式回転電機の軸
方向断面図における永久磁石9による磁束の流れ図を、
図5に、本発明の一実施の形態例の永久磁石式回転電機
の軸方向断面図における永久磁石9による磁束の流れ図
を示す。
FIG. 4 is a flow chart of the magnetic flux by the permanent magnet 9 in the axial sectional view of the conventional permanent magnet type rotating electric machine.
FIG. 5 shows a flow diagram of the magnetic flux by the permanent magnet 9 in the axial sectional view of the permanent magnet type rotating electric machine according to one embodiment of the present invention.
【0029】N極から出た磁束は、磁気抵抗の和が最少
の経路を通って、S極に入る。固定子や回転子に使用さ
れる鉄心は、ギャップに比べて磁気抵抗が小さいために
磁束が流れやすい。
The magnetic flux coming out of the N pole enters the S pole through a path having the minimum reluctance. The iron core used for the stator and the rotor has a smaller magnetic resistance than the gap, so that the magnetic flux easily flows.
【0030】図4では、磁束は磁気抵抗の大きいギャッ
プ部を最短距離で通過しようとするため、固定子鉄心2
の軸方向端部にはほとんど流れない。このため、固定子
鉄心2の軸方向中央部分には局部的な磁気飽和が起こり
易くなる。
In FIG. 4, since the magnetic flux tries to pass through the gap portion having a large magnetic resistance in the shortest distance, the stator core 2
Hardly flows to the axial end of. For this reason, local magnetic saturation is likely to occur in the axial center portion of the stator core 2.
【0031】一方、図5では、永久磁石9より外周側
に、永久磁石9より軸方向に長い外周側回転子鉄心8'
が形成されているので、永久磁石9からの磁束がその外
周側回転子鉄心8'を通り、固定子鉄心2の軸方向端部
分へ磁束を通し易くしている。
On the other hand, in FIG. 5, the outer peripheral rotor core 8 ′ which is longer in the axial direction than the permanent magnet 9 is provided on the outer peripheral side of the permanent magnet 9.
Is formed, the magnetic flux from the permanent magnet 9 passes through the outer rotor core 8 ′, and the magnetic flux is easily passed to the axial end of the stator core 2.
【0032】このように、本発明の一実施の形態例によ
る永久磁石式回転電機の方が、永久磁石9の外周部に形
成され、永久磁石9より軸方向に長い外周側回転子鉄心
8'を介して固定子鉄心2の端部にまで磁束が拡散され
ていることが明らかである。
As described above, the permanent magnet type rotating electric machine according to the embodiment of the present invention is formed on the outer periphery of the permanent magnet 9 and is longer than the permanent magnet 9 in the axial direction. It is evident that the magnetic flux is diffused to the end of the stator core 2 via.
【0033】図6に、従来例の永久磁石式回転電機と、
本実施の形態例に係る永久磁石式回転電機とを用いたと
きの固定子鉄心の軸方向磁束密度分布を示す。X軸に
は、固定子鉄心の軸方向の位置を、Y軸には、従来例に
おける最高磁束密度を100%としたときの磁束密度の
比を示している。
FIG. 6 shows a conventional permanent magnet type rotating electric machine,
4 shows an axial magnetic flux density distribution of a stator core when the permanent magnet type rotating electric machine according to the present embodiment is used. The X-axis shows the axial position of the stator core, and the Y-axis shows the ratio of the magnetic flux density when the maximum magnetic flux density in the conventional example is 100%.
【0034】図6に示すように、本実施の形態例に係る
永久磁石式回転電機は、従来例に比べて、軸方向中央部
分の磁束密度を下げて、軸方向端部分に磁束を拡散して
いることがわかる。これにより磁気飽和を防ぎつつ、最
大磁束密度の平方に比例する損失である鉄損を減少さ
せ、また漏れ磁束を減少させて、モータ効率を上げるこ
とができる。
As shown in FIG. 6, the permanent magnet type rotating electric machine according to the present embodiment lowers the magnetic flux density at the central portion in the axial direction and diffuses the magnetic flux at the axial end portions, as compared with the conventional example. You can see that it is. Thus, while preventing magnetic saturation, iron loss, which is a loss proportional to the square of the maximum magnetic flux density, can be reduced, and leakage magnetic flux can be reduced, so that motor efficiency can be increased.
【0035】図7に、本発明の第二の実施の形態例に係
る永久磁石式回転電機の軸方向断面図を示す。図中、図
1と同一部材には同一符号を付してある。図7に示すよ
うに、図1と異なるのは、回転子鉄心8の打抜穴7中
に、塊状鉄心13と永久磁石9を挿入している点であ
る。塊状鉄心13は、積層されてなくすべて鉄でできて
いるため、積層された鉄心よりもさらに磁気抵抗が小さ
くなり、永久磁石9からの磁束が、塊状鉄心13を通っ
てさらに磁束が端部に流れ、図1と同一効果が得られ
る。
FIG. 7 shows an axial sectional view of a permanent magnet type rotating electric machine according to a second embodiment of the present invention. In the figure, the same members as those in FIG. 1 are denoted by the same reference numerals. As shown in FIG. 7, the difference from FIG. 1 is that a massive iron core 13 and a permanent magnet 9 are inserted into a punched hole 7 of a rotor iron core 8. Since the massive iron core 13 is made of iron instead of being laminated, the magnetic resistance is further reduced as compared with the laminated iron core, and the magnetic flux from the permanent magnet 9 passes through the massive iron core 13 and the magnetic flux further flows to the end. Flow, the same effect as in FIG. 1 is obtained.
【0036】図8に、本発明の第三の実施の形態例に係
る永久磁石式回転電機の軸方向断面図を示し、図9に、
図8の回転子の斜視図を示す。図中、図1と同一部材に
は同一符号を付してある。図8、図9において、図7と
異なるのは、回転子鉄心8の打抜穴7中に、塊状鉄心1
3に溝14を設け該溝14内に永久磁石9を固定したも
のを挿入している点である。これにより、図1と同一効
果と共に、永久磁石9の位置決めの精度が高められる。
FIG. 8 is a sectional view in the axial direction of a permanent magnet type rotating electric machine according to a third embodiment of the present invention.
FIG. 9 shows a perspective view of the rotor of FIG. 8. In the figure, the same members as those in FIG. 1 are denoted by the same reference numerals. 8 and 9 are different from FIG. 7 in that the massive iron core 1 is provided in the punched hole 7 of the rotor core 8.
3 is provided with a groove 14 in which a permanent magnet 9 is fixed. Thereby, the positioning accuracy of the permanent magnet 9 is enhanced, in addition to the same effect as in FIG.
【0037】図10に、本発明の第四の実施の形態例に
係る永久磁石式回転電機の軸方向断面図を示し、図11
に、図10の回転子の斜視図を示す。図中、図1と同一
物には同一符号を付してある。図10、図11におい
て、図1と異なるのは、回転子鉄心8の軸方向の長さを
永久磁石9と同じくし、回転子鉄心8の軸方向の両端に
補助鉄心11を装着した点である。
FIG. 10 is an axial sectional view of a permanent magnet type rotating electric machine according to a fourth embodiment of the present invention.
10 shows a perspective view of the rotor of FIG. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals. 10 and 11 are different from FIG. 1 in that the axial length of the rotor core 8 is the same as that of the permanent magnet 9 and auxiliary cores 11 are attached to both ends of the rotor core 8 in the axial direction. is there.
【0038】補助鉄心11は、略リング状に形成され、
回転子鉄心8に取り付けられたとき、補助鉄心11のリ
ングの外周面が、回転子鉄心8の外周面と同じ位置にな
るように、装着されている。
The auxiliary core 11 is formed in a substantially ring shape.
When attached to the rotor core 8, the ring is attached so that the outer peripheral surface of the ring of the auxiliary iron core 11 is at the same position as the outer peripheral surface of the rotor core 8.
【0039】補助鉄心11は、積層もしくは塊状鉄心で
構成され、略リング状鉄心11aと、略リング状鉄心1
1aと内径の異なる薄型リング11bとが一体となって
構成されている。端板8c,8dは、非磁性材で作られ
ていて凸型になっており、シャフト穴10a及びリベッ
ト穴10bを有する。
The auxiliary core 11 is formed of a laminated or massive iron core, and includes a substantially ring-shaped core 11a and a substantially ring-shaped core 1a.
1a and a thin ring 11b having a different inner diameter are integrally formed. The end plates 8c and 8d are made of a non-magnetic material and have a convex shape, and have a shaft hole 10a and a rivet hole 10b.
【0040】そして、補助鉄心11は、端板8c,8d
を用いて、回転子鉄心8の軸方向の両端にリベット(図
示せず)で固定される。
The auxiliary core 11 is provided with end plates 8c and 8d.
Are fixed to the axial ends of the rotor core 8 with rivets (not shown).
【0041】これにより、補助鉄心11の機械的強度が
増すと共に、永久磁石9による磁束が、補助鉄心11を
介して、固定子鉄心2に導かれるので、本構成において
も図1と同一効果を得ることができる。
As a result, the mechanical strength of the auxiliary core 11 is increased, and the magnetic flux generated by the permanent magnet 9 is guided to the stator core 2 via the auxiliary core 11, so that the same effect as in FIG. Obtainable.
【0042】図12に、本発明の第五の実施の形態例に
係る永久磁石式回転電機の回転子の断面図を示す。図
中、図1〜図3と同一部材には同一符号を付してある。
図12において、非磁性材の端板8e,8fと塊状もし
くは積層した補助鉄心11'を溶解して一体に作ってお
り、固定子鉄心8を端板8e,8fで両側からリベット
(図示せず)で固着する。
FIG. 12 is a sectional view of a rotor of a permanent magnet type rotating electric machine according to a fifth embodiment of the present invention. In the drawings, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals.
In FIG. 12, end plates 8e and 8f made of non-magnetic material and a lump or laminated auxiliary core 11 'are melted and made integrally, and the stator core 8 is riveted from both sides by end plates 8e and 8f (not shown). ).
【0043】これにより、補助鉄心11'と端板8e,
8fの製作が容易になると共に、補助鉄心11'の機械
的強度が高まる。なお、永久磁石9は、軸方向から見た
回転子6の内部の位置であり、補助鉄心11'は、永久
磁石9より外径側にリング状に作られている。これによ
り、永久磁石9による磁束が、補助鉄心11'を介し
て、固定子鉄心2に導かれるので、本構成においても図
1と同一効果を得ることができる。
Thus, the auxiliary core 11 'and the end plates 8e,
8f is easily manufactured, and the mechanical strength of the auxiliary core 11 'is increased. The permanent magnet 9 is located inside the rotor 6 when viewed from the axial direction, and the auxiliary iron core 11 ′ is formed in a ring shape on the outer diameter side from the permanent magnet 9. As a result, the magnetic flux generated by the permanent magnet 9 is guided to the stator core 2 via the auxiliary core 11 ′, so that the same effect as in FIG. 1 can be obtained in this configuration.
【0044】図13に、本発明の第六の実施の形態例に
係る永久磁石式回転電機の軸方向断面図を示す。図中、
図1〜図3と同一部材には同一符号を付してある。図1
3において、図12と異なるのは、補助鉄心11''の極
間に非磁性材または空隙15を設けた点である、これに
より、極間の磁束の漏れを防ぐことができる。永久磁石
9による磁束が、補助鉄心11''を介して、固定子鉄心
2に導かれるので、本構成においても図1と同一効果を
得ることができる。
FIG. 13 shows an axial sectional view of a permanent magnet type rotating electric machine according to a sixth embodiment of the present invention. In the figure,
1 to 3 are denoted by the same reference numerals. FIG.
3 is different from FIG. 12 in that a non-magnetic material or a gap 15 is provided between the poles of the auxiliary iron core 11 ''. This can prevent leakage of magnetic flux between the poles. Since the magnetic flux generated by the permanent magnet 9 is guided to the stator core 2 via the auxiliary core 11 ″, the same effect as in FIG. 1 can be obtained in this configuration.
【0045】図14に、本発明の第七の実施の形態例に
係る永久磁石式回転電機の軸方向断面図を示し、図15
は、図14の回転子の斜視図を示す。図中、図1〜図3
と同一部材には同一符号を付してある。
FIG. 14 is an axial sectional view of a permanent magnet type rotating electric machine according to a seventh embodiment of the present invention.
14 shows a perspective view of the rotor of FIG. In the figures, FIGS.
The same members as those described above are denoted by the same reference numerals.
【0046】図14、図15において、略円筒型の鉄心
16は積層されており、永久磁石9の外周側を覆ってい
る。端板8g,8hは非磁性材で作られており、凸部分
と凹部分を持つ。鉄心16、永久磁石9及び回転子鉄心
8を、端板8g,8hで両側からリベット(図示せず)
で固着する。
14 and 15, a substantially cylindrical iron core 16 is laminated and covers the outer peripheral side of the permanent magnet 9. The end plates 8g and 8h are made of a non-magnetic material and have convex portions and concave portions. The core 16, the permanent magnet 9, and the rotor core 8 are riveted from both sides by end plates 8g and 8h (not shown).
To fix.
【0047】これにより、回転子6の機械的強度が高ま
る。なお、鉄心16の内径側の形状及び端板8g,8h
の凸部分の形状は永久磁石の形状及び配置によって決定
される。端板の凹部分はあってもなくてもよい。本構成
においても図1と同一効果を得ることができる。
As a result, the mechanical strength of the rotor 6 increases. The shape of the inner diameter side of the iron core 16 and the end plates 8g, 8h
Is determined by the shape and arrangement of the permanent magnets. The concave portion of the end plate may or may not be provided. In this configuration, the same effect as in FIG. 1 can be obtained.
【0048】図16に、本発明の第八の実施の形態例に
係る永久磁石式回転電機の軸方向断面図を示す。図中、
図1と同一部材には同一符号を付してある。図16にお
いて、永久磁石9は、軸方向に2分割されており、これ
により、軸方向の偏った磁束密度分布を平滑にし、鉄損
を低減することができる。本構成においても図1と同一
効果を得ることができる。
FIG. 16 shows an axial sectional view of a permanent magnet type rotating electric machine according to an eighth embodiment of the present invention. In the figure,
The same members as those in FIG. 1 are denoted by the same reference numerals. In FIG. 16, the permanent magnet 9 is divided into two parts in the axial direction, whereby the magnetic flux density distribution deviated in the axial direction can be smoothed, and iron loss can be reduced. In this configuration, the same effect as in FIG. 1 can be obtained.
【0049】図17に、本発明の第九の実施の形態例に
係る永久磁石式回転電機の軸方向断面図を示す。図中、
図1と同一部材には同一符号を付してある。図17にお
いて、軸方向の永久磁石9の中心が、軸方向の固定子2
の中心とずれており、これにより軸方向に吸引力が働
く。軸方向吸引力を必要とする圧縮機用回転電機等に有
効である。
FIG. 17 is an axial sectional view of a permanent magnet type rotating electric machine according to a ninth embodiment of the present invention. In the figure,
The same members as those in FIG. 1 are denoted by the same reference numerals. In FIG. 17, the center of the permanent magnet 9 in the axial direction is
, And thereby a suction force acts in the axial direction. This is effective for a rotary electric machine for a compressor that requires an axial suction force.
【0050】[0050]
【発明の効果】本発明によれば、固定子鉄心の局部的な
磁気飽和を防いで鉄損を減らすと共に、磁気飽和による
磁束の漏れを防ぐことにより、誘導起電力が大きくで
き、モータ効率を上げることができる。
According to the present invention, localized magnetic saturation of the stator core is prevented to reduce iron loss, and by preventing magnetic flux leakage due to magnetic saturation, the induced electromotive force can be increased and motor efficiency can be improved. Can be raised.
【0051】また、鉄心材の同時打ち抜きが可能とな
り、固定子鉄心及び回転子鉄心に余剰を生じさせること
がなくなるので、資源の有効利用を図ることができる。
Further, the core material can be punched at the same time, so that the stator core and the rotor core do not have a surplus, so that the resources can be effectively used.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の第一の実施の形態例に係わる永久磁石
式回転電機の軸方向断面図である。
FIG. 1 is an axial sectional view of a permanent magnet type rotating electric machine according to a first embodiment of the present invention.
【図2】図1のA−Aの縦断面図である。FIG. 2 is a longitudinal sectional view taken along line AA of FIG.
【図3】図1のB−Bの縦断面図である。FIG. 3 is a vertical sectional view taken along line BB of FIG. 1;
【図4】従来例の永久磁石式回転電機における永久磁石
による磁束の流れ図である。
FIG. 4 is a flow chart of magnetic flux by a permanent magnet in a conventional permanent magnet type rotating electric machine.
【図5】本発明の一実施の形態例の永久磁石式回転電機
における永久磁石による磁束の流れ図である。
FIG. 5 is a flow chart of a magnetic flux by a permanent magnet in the permanent magnet type rotating electric machine according to one embodiment of the present invention;
【図6】本発明の一実施の形態例の永久磁石式回転電機
における固定子鉄心の軸方向磁束密度分布を示す図であ
る。
FIG. 6 is a diagram showing an axial magnetic flux density distribution of a stator core in a permanent magnet type rotating electric machine according to one embodiment of the present invention.
【図7】本発明の第二の実施の形態例に係わる永久磁石
式回転電機の軸方向断面図である。
FIG. 7 is an axial sectional view of a permanent magnet type rotating electric machine according to a second embodiment of the present invention.
【図8】本発明の第三の実施の形態例に係わる永久磁石
式回転電機の軸方向断面図である。
FIG. 8 is an axial sectional view of a permanent magnet type rotating electric machine according to a third embodiment of the present invention.
【図9】図8の回転子の斜視図である。FIG. 9 is a perspective view of the rotor of FIG. 8;
【図10】本発明の第四の実施の形態例に係わる永久磁
石式回転電機の軸方向断面図である。
FIG. 10 is an axial sectional view of a permanent magnet type rotating electric machine according to a fourth embodiment of the present invention.
【図11】図10の回転子の斜視図である。FIG. 11 is a perspective view of the rotor of FIG. 10;
【図12】本発明の第五の実施の形態例に係る永久磁石
式回転電機の回転子の断面図である。
FIG. 12 is a sectional view of a rotor of a permanent magnet type rotating electric machine according to a fifth embodiment of the present invention.
【図13】本発明の第六の実施の形態例に係わる永久磁
石式回転電機の軸方向断面図である。
FIG. 13 is an axial sectional view of a permanent magnet type rotating electric machine according to a sixth embodiment of the present invention.
【図14】本発明の第七の実施の形態例に係わる永久磁
石式回転電機の軸方向断面図である。
FIG. 14 is an axial sectional view of a permanent magnet type rotating electric machine according to a seventh embodiment of the present invention.
【図15】図14の回転子の斜視図である。FIG. 15 is a perspective view of the rotor of FIG. 14;
【図16】本発明の第八の実施の形態例に係わる永久磁
石式回転電機の軸方向断面図である。
FIG. 16 is an axial sectional view of a permanent magnet type rotating electric machine according to an eighth embodiment of the present invention.
【図17】本発明の第九の実施の形態例に係わる永久磁
石式回転電機の軸方向断面図である。
FIG. 17 is an axial sectional view of a permanent magnet type rotating electric machine according to a ninth embodiment of the present invention.
【符号の説明】[Explanation of symbols]
1…固定子、2…固定子鉄心、3…固定子巻線、4a,
4b…エンドブラケット、5a,5b…ベアリング、6
…回転子、7…打抜穴、8…回転子鉄心、8'…外周側
回転子鉄心、8a,8b,8c,8d,8e,8f,8
g,8h…端板、9…永久磁石、10…シャフト、10
a…シャフト穴、10b…リベット穴、11,11',
11''…補助鉄心、12…フレーム、13…塊状鉄心、
14…溝、15…非磁性材または空隙、16…略円筒型
の鉄心
DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Stator iron core, 3 ... Stator winding, 4a,
4b: End bracket, 5a, 5b: Bearing, 6
... rotor, 7 ... punched hole, 8 ... rotor core, 8 '... outer peripheral rotor core, 8a, 8b, 8c, 8d, 8e, 8f, 8
g, 8h: end plate, 9: permanent magnet, 10: shaft, 10
a: shaft hole, 10b: rivet hole, 11, 11 ',
11 '': auxiliary core, 12: frame, 13: massive iron core,
14: groove, 15: non-magnetic material or void, 16: substantially cylindrical iron core

Claims (5)

    【特許請求の範囲】[Claims]
  1. 【請求項1】固定子巻線を巻回した固定子鉄心を有する
    固定子と、該固定子鉄心と所定のギャップを有して回転
    可能に対向し、永久磁石を内蔵する回転子鉄心を有する
    回転子とを有し、前記固定子巻線に通電することにより
    前記回転子を回転駆動させる永久磁石式回転電機におい
    て、 前記回転子鉄心の軸方向に形成された複数の打抜穴に埋
    め込まれた前記永久磁石より外周側に外周側回転子鉄心
    を形成し、前記外周側回転子鉄心の軸方向の長さを前記
    永久磁石の軸方向の長さより長くして、前記永久磁石か
    らの磁束を前記外周側回転子鉄心を介して前記固定子鉄
    心の軸方向端部へ拡散させることを特徴とする永久磁石
    式回転電機。
    1. A stator having a stator core wound with a stator winding, and a rotor core rotatably facing the stator core with a predetermined gap and having a permanent magnet built therein. A permanent magnet type rotating electric machine having a rotor and rotating the rotor by energizing the stator windings, wherein the permanent magnet type rotating electric machine is embedded in a plurality of punched holes formed in an axial direction of the rotor core. An outer peripheral rotor core is formed on the outer peripheral side of the permanent magnet, and the axial length of the outer peripheral rotor core is longer than the axial length of the permanent magnet to reduce the magnetic flux from the permanent magnet. A permanent magnet type rotating electric machine characterized in that the stator core is diffused to an axial end portion of the stator core via the outer rotor core.
  2. 【請求項2】固定子巻線を巻回した固定子鉄心を有する
    固定子と、該固定子鉄心と所定のギャップを有して回転
    可能に対向し、永久磁石を内蔵する回転子鉄心を有する
    回転子とを有し、前記固定子巻線に通電することにより
    前記回転子を回転駆動させる永久磁石式回転電機におい
    て、 前記回転子鉄心の軸方向に形成された複数の打抜穴に埋
    め込まれた前記永久磁石より外周側に外周側回転子鉄心
    を形成し、前記外周側回転子鉄心の軸方向の長さを、前
    記永久磁石の軸方向の長さより長くし、かつ前記固定子
    鉄心の軸方向の長さとほぼ同じにして、前記永久磁石か
    らの磁束を前記外周側回転子鉄心を介して前記固定子鉄
    心の軸方向端部へ拡散させることを特徴とする永久磁石
    式回転電機。
    2. A stator having a stator core wound with a stator winding, and a rotor core having a predetermined gap and rotatably facing the stator core and having a permanent magnet built therein. A permanent magnet type rotating electric machine having a rotor and rotating the rotor by energizing the stator windings, wherein the permanent magnet type rotating electric machine is embedded in a plurality of punched holes formed in an axial direction of the rotor core. An outer peripheral rotor core is formed on an outer peripheral side of the permanent magnet, an axial length of the outer peripheral rotor core is longer than an axial length of the permanent magnet, and an axis of the stator core is formed. A permanent magnet type rotating electric machine wherein the magnetic flux from the permanent magnet is diffused to the axial end of the stator core through the outer rotor core with substantially the same length in the direction.
  3. 【請求項3】請求項1または請求項2記載の永久磁石式
    回転電機において、前記各打抜穴の前記永久磁石の外側
    に、前記永久磁石に隣接させて前記永久磁石の軸方向の
    長さより軸方向の長さが長い塊状鉄心を埋め込むことを
    特徴とする永久磁石式回転電機。
    3. The permanent-magnet-type electric rotating machine according to claim 1, wherein an outer side of each of the punched holes and the permanent magnet is adjacent to the permanent magnet and has a length in the axial direction of the permanent magnet. A permanent magnet type rotating electric machine characterized by embedding a massive iron core having a long axial length.
  4. 【請求項4】請求項1または請求項2記載の永久磁石式
    回転電機において、前記回転子は、前記回転子鉄心と、
    該回転子鉄心の軸方向の両端に装着された補助鉄心とを
    有し、前記補助鉄心は、略リング状に形成され、前記補
    助鉄心の略リングの内周面が前記永久磁石の外側に位置
    し、前記略リングの外周面が前記回転子鉄心の外周面と
    同じ位置になるように装着されることを特徴とする永久
    磁石式回転電機。
    4. The permanent magnet type rotating electric machine according to claim 1, wherein said rotor is provided with said rotor core,
    An auxiliary core mounted on both ends of the rotor core in the axial direction, wherein the auxiliary core is formed in a substantially ring shape, and an inner peripheral surface of a substantially ring of the auxiliary core is located outside the permanent magnet. The permanent magnet type rotating electric machine is mounted so that the outer peripheral surface of the substantially ring is located at the same position as the outer peripheral surface of the rotor core.
  5. 【請求項5】請求項1または請求項2記載の永久磁石式
    回転電機において、前記永久磁石は、該永久磁石の軸方
    向に少なくとも一個以上に分割されることを特徴とする
    永久磁石式回転電機。
    5. The permanent magnet type rotating electric machine according to claim 1, wherein said permanent magnet is divided into at least one or more in the axial direction of said permanent magnet. .
JP3731798A 1998-02-19 1998-02-19 Permanent magnet-incorporated rotary electric machine Pending JPH11234931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3731798A JPH11234931A (en) 1998-02-19 1998-02-19 Permanent magnet-incorporated rotary electric machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3731798A JPH11234931A (en) 1998-02-19 1998-02-19 Permanent magnet-incorporated rotary electric machine

Publications (1)

Publication Number Publication Date
JPH11234931A true JPH11234931A (en) 1999-08-27

Family

ID=12494308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3731798A Pending JPH11234931A (en) 1998-02-19 1998-02-19 Permanent magnet-incorporated rotary electric machine

Country Status (1)

Country Link
JP (1) JPH11234931A (en)

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WO2002019499A1 (en) * 2000-09-01 2002-03-07 Matsushita Electric Industrial Co., Ltd. Electric motor
JP2006211801A (en) * 2005-01-27 2006-08-10 Matsushita Electric Ind Co Ltd Motor with embedded permanent magnet
WO2006085440A1 (en) * 2005-02-09 2006-08-17 Daikin Industries, Ltd. Core, rotor, motor, and compressor
JP2006254684A (en) * 2005-03-08 2006-09-21 Lg Electronics Inc Motor
JP2010233346A (en) * 2009-03-27 2010-10-14 Hitachi Industrial Equipment Systems Co Ltd Permanent magnet motor
DE102011086280A1 (en) * 2011-11-14 2013-05-16 Schaeffler Technologies AG & Co. KG Permanently-excited three-phase-synchronous machine for use as traction drive in motor car, has stator comprising tooth coil winding, and rotor comprising permanent magnets and partial rotors that are rotated opposite to each other
US20140265703A1 (en) * 2010-06-30 2014-09-18 Asmo Co., Ltd. Motor and rotor
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WO2002019499A1 (en) * 2000-09-01 2002-03-07 Matsushita Electric Industrial Co., Ltd. Electric motor
US6799362B2 (en) 2000-09-01 2004-10-05 Matsushita Electric Industrial Co., Ltd. Motor and method for manufacturing the same
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US9667107B2 (en) * 2010-06-30 2017-05-30 Asmo Co., Ltd. Motor and rotor
DE102011086280A1 (en) * 2011-11-14 2013-05-16 Schaeffler Technologies AG & Co. KG Permanently-excited three-phase-synchronous machine for use as traction drive in motor car, has stator comprising tooth coil winding, and rotor comprising permanent magnets and partial rotors that are rotated opposite to each other
CN107911001A (en) * 2012-07-19 2018-04-13 三菱电机株式会社 Embedded magnet-type synchronous motor
CN104584400A (en) * 2012-07-19 2015-04-29 三菱电机株式会社 Implanted-magnet synchronous electric motor
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US9948167B2 (en) 2012-10-31 2018-04-17 Fanuc Corporation Rotor of motor which uses magnets to achieve variation-free torque
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US10424978B2 (en) 2016-04-25 2019-09-24 Fanuc Corporation Rotating electrical machine comprising stator core, and machine tool comprising the same
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WO2021033557A1 (en) * 2019-08-21 2021-02-25 日本精工株式会社 Direct drive motor

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