JP2004048970A - Permanent-magnet rotary-electric machine - Google Patents

Permanent-magnet rotary-electric machine Download PDF

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Publication number
JP2004048970A
JP2004048970A JP2002206507A JP2002206507A JP2004048970A JP 2004048970 A JP2004048970 A JP 2004048970A JP 2002206507 A JP2002206507 A JP 2002206507A JP 2002206507 A JP2002206507 A JP 2002206507A JP 2004048970 A JP2004048970 A JP 2004048970A
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JP
Japan
Prior art keywords
permanent magnet
electric machine
magnet type
rotor
rotating electric
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
JP2002206507A
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Japanese (ja)
Inventor
Yoshitaka Azuma
東　義高
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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 Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP2002206507A priority Critical patent/JP2004048970A/en
Publication of JP2004048970A publication Critical patent/JP2004048970A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet surface stuck-type permanent-magnet rotary-electric machine wherein permanent magnets are fit in dovetail grooves formed on the circumferential surface of a rotor core, which allows suppression of degradation in response and increase in torque ripples due to the interpole cores between the dovetail grooves. <P>SOLUTION: The permanent-magnet rotary-electric machine comprises a rotor 33 formed by fitting permanent magnets 32, respectively, in a plurality of the dovetail grooves 31a formed on the circumferential surface of the rotor core 31; and a stator 34 disposed so that the rotor 33 is enclosed with the stator. Grooves 31d having U-shaped or V-shaped cross sections are formed on the outer surfaces 31c of the interpole cores 31b between the dovetail grooves 31a. The bottom and both ends of the V-shaped grooves are rounded. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は永久磁石形回転電機に関し、特に表面磁石貼付型の永久磁石形回転電機に適用して有用なものである。
【０００２】
【従来の技術】
図５及び図６は従来の永久磁石形同期電動機の構成を示す横断面図である。図５に示す永久磁石形同期電動機は、回転軸５に固定されたロータ鉄心１の内部に永久磁石２が埋め込まれた構成のロータ３と、ロータ３の周囲を囲むように配置されたステータ４とを有している。一方、図６に示す永久磁石形同期電動機は、回転軸１５に固定されたロータ鉄心１１の外周面に永久磁石１２が貼付された構成のロータ１３と、ロータ１３の周囲を囲むように配置されたステータ１４とを有している。
【０００３】
一般的に図５に示すような埋め込み磁石型の永久磁石形同期電動機（ＩＰＭモータ）に比べ、図６に示すような表面磁石貼付型の永久磁石形同期電動機（ＳＰＭモータ）は、ステータ１４に対し、ロータ鉄心１１が離れているため、Ｌ成分低く、応答性がよく、トルクリプルが小さいといわれている。
【０００４】
【発明が解決しようとする課題】
しかし、ＳＰＭモータはＩＰＭモータに比べ、永久磁石１２がロータ鉄心１１の外周面（表面）に貼り付けられているため、遠心力に弱い。そこで、この解決策として、図７に示すようにロータ鉄心１１の外周面に複数のあり溝１１ａを掘り、これらのあり溝１１ａのそれぞれに永久磁石１２を嵌め込むという方法が採られている。この場合、ロータ鉄心周方向の幅がロータ鉄心径方向の内側に向かって広がる形状の永久磁石１２を、ロータ鉄心周方向の幅がロータ鉄心径方向の内側に向かって広がる形状のあり溝１１ａに嵌め込むため、永久磁石１２を確実に固定することができる。即ち、ロータ鉄心周方向において隣り合うあり溝１１ａの間の極間鉄心１１ｂは、ロータ鉄心周方向の幅がロータ鉄心径方向の外側に向かって広がる形状の突起部となっており、各永久磁石１２はこれらの極間鉄心１１ｂに固定されて遠心力の方向に飛び出すことがない。
【０００５】
ところが、この場合には極間鉄心１１ｂが固定子１４の近くに存在することから、Ｌ成分が大きくなり、特性がＩＰＭモータに近くなるため、応答性の悪化やトルクリプルの増大を招く。
【０００６】
従って本発明は上記の事情に鑑み、ロータ鉄心の外周面のあり溝に永久磁石を嵌合した表面磁石貼付型の永久磁石形回転電機であって、前記あり溝の間の極間鉄心による応答性の悪化やトルクリプルの増大を抑えることができる永久磁石形回転電機を提供することを課題とする。
【０００７】
【課題を解決するための手段】
上記課題を解決する第１発明の永久磁石形回転電機は、ロータ鉄心の外周面に形成した複数のあり溝にそれぞれ永久磁石を嵌合してなる構成のロータと、このロータの周囲を囲むように配置したステータとを有する永久磁石形回転電機において、
ロータ鉄心周方向にて隣合う前記あり溝の間の極間鉄心の外表面に溝を形成したことを特徴とする。
【０００８】
また、第２発明の永久磁石形回転電機は、第１発明の永久磁石形回転電機において、
前記極間鉄心の外表面に形成した溝は横断面形状がＵ字状であることを特徴とする。
【０００９】
また、第３発明の永久磁石形回転電機は、第１発明の永久磁石形回転電機において、
前記極間鉄心の外表面に形成した溝は横断面形状がＶ字状であることを特徴とする。
【００１０】
また、第４発明の永久磁石形回転電機は、第３発明の永久磁石形回転電機において、
前記Ｖ字状の溝の底部と両端部とに丸みをつけたことを特徴とする。
【００１１】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づき詳細に説明する。
【００１２】
＜実施の形態１＞
図１は本発明の実施の形態１に係る永久磁石形同期電動機の構成を示す横断面図、図２は図１のＡ部拡大横断面図である。
【００１３】
図１に示すように本実施の形態１の永久磁石形同期電動機は、回転軸３５に固定されたロータ鉄心３１の外周面に永久磁石３２が貼付された構成のロータ３３と、ロータ３３の周囲を囲むように配置されたステータ３４とを有している（ＳＰＭモータ）。なお、図示は省略しているが、ステータ３４はステータ鉄心にコイルを巻いた構成となっている。
【００１４】
ロータ鉄心３１の外周面には複数のあり溝３１ａが掘られており、これらのあり溝３１ａのそれぞれに永久磁石３２が嵌め込まれている。この場合、ロータ鉄心周方向の幅がロータ鉄心径方向の内側に向かって広がる形状の永久磁石３２を、ロータ鉄心周方向の幅がロータ鉄心径方向の内側に向かって広がる形状のあり溝３１ａに嵌め込むため、永久磁石３２を確実に固定することができる。即ち、ロータ鉄心周方向において隣り合うあり溝３１ａの間の極間鉄心３１ｂは、ロータ鉄心周方向の幅がロータ鉄心径方向の外側に向かって広がる形状の突起部となっており、各永久磁石３２はこれらの極間鉄心３１ｂに固定されて遠心力の方向に飛び出すことがない。
【００１５】
そして、本実施の形態１の永久磁石形同期電動機では、各極間鉄心３１ｂの外表面３１ｃに横断面形状がＵ字状の溝３１ｄが形成されている。
【００１６】
従って、本実施の形態１の永久磁石形同期電動機によれば、極間鉄心３１ｂの外表面３１ｃにＵ字状の溝３１ｄを形成したため、ステータ３４の近くに存在する極間鉄心３１ｂの量が少なくなり、Ｌ分が小さくなる。このため、永久磁石形同期電動機の応答性が向上し、トルクリプルが小さくなる。
【００１７】
＜実施の形態２＞
図３は本発明の実施の形態２に係る永久磁石形同期電動機の構成を示す要部横断面図である。なお、本永久磁石形同期電動機の全体的な構成については上記実施の形態１と同様であるため、ここでの説明及び図示は省略する。
【００１８】
そして、図３に示すように本実施の形態２の永久磁石形同期電動機では、各極間鉄心３１ｂの外表面３１ｃに横断面形状がＶ字状の溝３１ｅが形成されている。
【００１９】
従って、本実施の形態２によれば、極間鉄心３１ｂの外表面３１ｃにＶ字状の溝３１を形成したため、上記実施の形態１の場合よりも更にステータ３４の近くに存在する極間鉄心３１ｂの量が少なくなり、Ｌ分が小さくなる。このため、更に永久磁石形同期電動機の応答性が向上し、トルクリプルが小さくなる。
【００２０】
＜実施の形態３＞
図４は本発明の実施の形態３に係る永久磁石形同期電動機の構成を示す要部横断面図である。なお、本永久磁石形同期電動機の全体的な構成については上記実施の形態１と同様であるため、ここでの説明及び図示は省略する。
【００２１】
そして、図４に示すように本実施の形態３の永久磁石形同期電動機では、各極間鉄心３１ｂの外表面３１ｃに横断面形状がＶ字状の溝３１ｅが形成され、且つ、これらのＶ字状の溝３１ｅの底部３１ｅ−１と両端部３１ｅ−２とに丸み（Ｒ）がつけられている。
【００２２】
従って、本実施の形態３によれば、極間鉄心３１ｂの外表面３１ｃにＶ字状の溝３１ｅを形成し、且つ、これらのＶ字状の溝３１ｅの底部３１ｅ−１と両端部３１ｅ−２とに丸み（Ｒ）がつけたため、上記実施の形態２の場合よりも更にステータ３４の近くに存在する極間鉄心３１ｂの量が少なくなり、Ｌ分が小さくなる。このため、更に永久磁石形同期電動機の応答性が向上し、トルクリプルが小さくなる。また、丸み（Ｒ）をつけることによってＶ字状の溝３１ｅに角部がなくなるため、製作が容易になる。
【００２３】
【発明の効果】
以上発明の実施の形態とともに具体的に説明したように、第１発明の永久磁石形回転電機によれば、ロータ鉄心の外周面に形成した複数のあり溝にそれぞれ永久磁石を嵌合してなる構成のロータと、このロータの周囲を囲むように配置したステータとを有する永久磁石形回転電機において、ロータ鉄心周方向にて隣合う前記あり溝の間の極間鉄心の外表面に溝を形成したため、ステータの近くに存在する極間鉄心の量が少なくなり、Ｌ分が小さくなる。このため、永久磁石形回転電機の応答性が向上し、トルクリプルが小さくなる。
【００２４】
また、第２発明の永久磁石形回転電機によれば、第１発明の永久磁石形回転電機において、前記極間鉄心の外表面に形成した溝は横断面形状がＵ字状であるため、第１発明と同様の効果を有し、製作も比較的容易である。
【００２５】
また、第３発明の永久磁石形回転電機によれば、第１発明の永久磁石形回転電機において、前記極間鉄心の外表面に形成した溝は横断面形状がＶ字状であるため、第２発明の場合よりも更にステータの近くに存在する極間鉄心の量が少なくなり、Ｌ分が小さくなる。このため、更に永久磁石形同期電動機の応答性が向上し、トルクリプルが小さくなる。
【００２６】
また、第４発明の永久磁石形回転電機によれば、第３発明の永久磁石形回転電機において、前記Ｖ字状の溝の底部と両端部とに丸みをつけたため、第３発明の場合よりも更にステータの近くに存在する極間鉄心の量が少なくなり、Ｌ分が小さくなる。このため、更に永久磁石形同期電動機の応答性が向上し、トルクリプルが小さくなる。また、丸み（Ｒ）をつけることによってＶ字状の溝に角部がなくなるため、製作が容易になる。
【図面の簡単な説明】
【図１】本発明の実施の形態１に係る永久磁石形同期電動機の構成を示す横断面図である。
【図２】図１のＡ部拡大横断面図である。
【図３】本発明の実施の形態２に係る永久磁石形同期電動機の構成を示す要部横断面図である。
【図４】本発明の実施の形態３に係る永久磁石形同期電動機の構成を示す要部横断面図である。
【図５】従来の永久磁石形同期電動機の構成を示す横断面図である。
【図６】従来の永久磁石形同期電動機の構成を示す横断面図である。
【図７】ロータ鉄心外周面のあり溝に永久磁石を嵌合した表面磁石貼付型の永久磁石形同期電動機の構成を示す要部横断面図である。
【符号の説明】
３１　ロータ鉄心
３１ａ　あり溝
３１ｂ　極間鉄心
３１ｃ　極間鉄心の外表面
３１ｄ　Ｕ字状の溝
３１ｅ　Ｖ字状の溝
３１ｅ−１　Ｖ字状の溝の底部
３１ｅ−２　Ｖ字状の溝の端部
３２　永久磁石
３３　ロータ
３４　ステータ
３５　回転軸[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a permanent magnet type rotating electric machine, and is particularly useful when applied to a surface magnet pasted type permanent magnet type rotating electric machine.
[0002]
[Prior art]
5 and 6 are cross-sectional views showing the configuration of a conventional permanent magnet synchronous motor. The permanent magnet synchronous motor shown in FIG. 5 includes a rotor 3 having a permanent magnet 2 embedded inside a rotor core 1 fixed to a rotating shaft 5, and a stator 4 arranged to surround the periphery of the rotor 3. And On the other hand, a permanent magnet type synchronous motor shown in FIG. 6 is arranged so as to surround a rotor 13 having a configuration in which a permanent magnet 12 is attached to an outer peripheral surface of a rotor core 11 fixed to a rotating shaft 15 and a periphery of the rotor 13. Stator 14.
[0003]
In general, a permanent magnet type synchronous motor (SPM motor) with a surface magnet attached as shown in FIG. 6 has a stator 14 in comparison with an embedded magnet type permanent magnet type synchronous motor (IPM motor) as shown in FIG. On the other hand, since the rotor core 11 is separated, it is said that the L component is low, the response is good, and the torque ripple is small.
[0004]
[Problems to be solved by the invention]
However, the SPM motor is less susceptible to centrifugal force than the IPM motor because the permanent magnet 12 is attached to the outer peripheral surface (surface) of the rotor core 11. Therefore, as a solution to this, a method is employed in which a plurality of dovetail grooves 11a are dug on the outer peripheral surface of the rotor core 11 as shown in FIG. 7, and a permanent magnet 12 is fitted into each of these dovetail grooves 11a. In this case, the permanent magnet 12 having a shape in which the width in the circumferential direction of the rotor core expands toward the inside in the radial direction of the rotor core is provided in the groove 11a having a shape in which the width in the circumferential direction of the rotor core extends toward the inside in the radial direction of the rotor core. Since the permanent magnet 12 is fitted, the permanent magnet 12 can be securely fixed. In other words, the pole core 11b between the dovetail grooves 11a adjacent to each other in the rotor core circumferential direction is a protrusion having a shape such that the width in the rotor core circumferential direction expands outward in the rotor core radial direction. Numeral 12 is fixed to these iron cores 11b and does not fly out in the direction of centrifugal force.
[0005]
However, in this case, since the gap iron core 11b is present near the stator 14, the L component becomes large, and the characteristics become close to those of the IPM motor, so that the response is deteriorated and the torque ripple is increased.
[0006]
Accordingly, the present invention has been made in view of the above circumstances, and is a surface magnet-attached type permanent magnet type rotating electric machine in which a permanent magnet is fitted in a dovetail groove on the outer peripheral surface of a rotor iron core. It is an object of the present invention to provide a permanent magnet type rotating electric machine capable of suppressing deterioration of performance and increase of torque ripple.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a permanent magnet type rotating electric machine configured to fit a plurality of dovetail grooves formed on an outer peripheral surface of a rotor core with permanent magnets, respectively, and to surround the periphery of the rotor. In a permanent magnet type rotating electric machine having a stator disposed in
A groove is formed on the outer surface of the pole core between the dovetail grooves adjacent in the circumferential direction of the rotor core.
[0008]
The permanent magnet type rotating electric machine of the second invention is the permanent magnet type rotating electric machine of the first invention,
The groove formed in the outer surface of the pole core has a U-shaped cross section.
[0009]
Further, the permanent magnet type rotating electric machine of the third invention is the permanent magnet type rotating electric machine of the first invention,
The groove formed in the outer surface of the pole core has a V-shaped cross section.
[0010]
Further, the permanent magnet type rotating electric machine of the fourth invention is the permanent magnet type rotating electric machine of the third invention,
The bottom and both ends of the V-shaped groove are rounded.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
<Embodiment 1>
FIG. 1 is a cross-sectional view showing a configuration of a permanent magnet type synchronous motor according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.
[0013]
As shown in FIG. 1, the permanent magnet type synchronous motor according to the first embodiment includes a rotor 33 having a configuration in which a permanent magnet 32 is attached to an outer peripheral surface of a rotor core 31 fixed to a rotating shaft 35, and a periphery of the rotor 33. (SPM motor). Although not shown, the stator 34 has a configuration in which a coil is wound around a stator core.
[0014]
A plurality of dovetail grooves 31a are dug in the outer peripheral surface of the rotor core 31, and a permanent magnet 32 is fitted into each of these dovetail grooves 31a. In this case, the permanent magnet 32 having a shape in which the width in the circumferential direction of the rotor core expands toward the inside in the radial direction of the rotor core is provided in the groove 31a having a shape in which the width in the circumferential direction of the rotor core extends toward the inside in the radial direction of the rotor core. Since the permanent magnet 32 is fitted, the permanent magnet 32 can be securely fixed. That is, the pole core 31b between the dovetail grooves 31a adjacent to each other in the circumferential direction of the rotor core is a projection having a shape in which the width in the circumferential direction of the rotor core expands outward in the radial direction of the rotor core. 32 is fixed to these cores 31b and does not protrude in the direction of centrifugal force.
[0015]
In the permanent magnet synchronous motor of the first embodiment, a groove 31d having a U-shaped cross section is formed on the outer surface 31c of each of the pole cores 31b.
[0016]
Therefore, according to the permanent magnet type synchronous motor of the first embodiment, since the U-shaped groove 31d is formed on the outer surface 31c of the pole core 31b, the amount of the pole core 31b existing near the stator 34 is reduced. And L is reduced. Therefore, the responsiveness of the permanent magnet type synchronous motor is improved, and the torque ripple is reduced.
[0017]
<Embodiment 2>
FIG. 3 is a main part cross-sectional view showing a configuration of a permanent magnet synchronous motor according to Embodiment 2 of the present invention. Since the overall configuration of the permanent magnet synchronous motor is the same as that of the first embodiment, the description and illustration are omitted here.
[0018]
As shown in FIG. 3, in the permanent magnet synchronous motor according to the second embodiment, a groove 31e having a V-shaped cross section is formed on the outer surface 31c of each pole core 31b.
[0019]
Therefore, according to the second embodiment, since the V-shaped groove 31 is formed on the outer surface 31c of the gap core 31b, the gap core existing closer to the stator 34 than in the case of the first embodiment. The amount of 31b decreases, and the L component decreases. For this reason, the responsiveness of the permanent magnet type synchronous motor is further improved, and the torque ripple is reduced.
[0020]
<Embodiment 3>
FIG. 4 is a main part cross-sectional view showing a configuration of a permanent magnet type synchronous motor according to Embodiment 3 of the present invention. Since the overall configuration of the permanent magnet synchronous motor is the same as that of the first embodiment, the description and illustration are omitted here.
[0021]
As shown in FIG. 4, in the permanent magnet type synchronous motor according to the third embodiment, a groove 31e having a V-shaped cross section is formed on the outer surface 31c of each pole core 31b. The bottom 31e-1 and both ends 31e-2 of the letter-shaped groove 31e are rounded (R).
[0022]
Therefore, according to the third embodiment, V-shaped grooves 31e are formed on the outer surface 31c of the pole core 31b, and the bottom 31e-1 and both ends 31e- of these V-shaped grooves 31e. 2 and the roundness (R), the amount of the iron core 31b located closer to the stator 34 is further reduced than in the case of the second embodiment, and the L component is reduced. For this reason, the responsiveness of the permanent magnet type synchronous motor is further improved, and the torque ripple is reduced. Also, the roundness (R) eliminates corners in the V-shaped groove 31e, thereby facilitating manufacture.
[0023]
【The invention's effect】
As described above in detail with the embodiments of the present invention, according to the permanent magnet type rotating electric machine of the first invention, the permanent magnets are fitted into the plurality of dovetail grooves formed on the outer peripheral surface of the rotor core. In a permanent magnet type rotating electric machine having a rotor having a configuration and a stator arranged so as to surround the periphery of the rotor, a groove is formed on the outer surface of the pole core between the dovetail grooves adjacent in the circumferential direction of the rotor core. As a result, the amount of the core between the poles existing near the stator is reduced, and the L component is reduced. Therefore, the responsiveness of the permanent magnet type rotating electric machine is improved, and the torque ripple is reduced.
[0024]
According to the permanent magnet type rotating electric machine of the second invention, in the permanent magnet type rotating electric machine of the first invention, the groove formed on the outer surface of the pole core has a U-shaped cross-sectional shape. It has the same effect as the first invention, and is relatively easy to manufacture.
[0025]
Further, according to the permanent magnet type rotating electric machine of the third invention, in the permanent magnet type rotating electric machine of the first invention, since the groove formed on the outer surface of the pole core has a V-shaped cross section, The amount of the iron core existing near the stator is further reduced than in the case of the second invention, and the L component is reduced. For this reason, the responsiveness of the permanent magnet type synchronous motor is further improved, and the torque ripple is reduced.
[0026]
Further, according to the permanent magnet type rotating electric machine of the fourth invention, in the permanent magnet type rotating electric machine of the third invention, the bottom and both ends of the V-shaped groove are rounded, so that the case of the third invention is improved. In addition, the amount of the core between the poles existing near the stator is reduced, and the L component is reduced. For this reason, the responsiveness of the permanent magnet type synchronous motor is further improved, and the torque ripple is reduced. In addition, the roundness (R) eliminates corners in the V-shaped groove, thereby facilitating manufacture.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a permanent magnet type synchronous motor according to Embodiment 1 of the present invention.
FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 3 is a cross-sectional view of a main part showing a configuration of a permanent magnet type synchronous motor according to Embodiment 2 of the present invention.
FIG. 4 is a main part cross-sectional view showing a configuration of a permanent magnet type synchronous motor according to Embodiment 3 of the present invention.
FIG. 5 is a cross-sectional view showing a configuration of a conventional permanent magnet synchronous motor.
FIG. 6 is a cross-sectional view showing a configuration of a conventional permanent magnet synchronous motor.
FIG. 7 is a cross-sectional view of a main part showing a configuration of a permanent magnet type synchronous motor of a surface magnet sticking type in which a permanent magnet is fitted into a groove on the outer peripheral surface of a rotor core.
[Explanation of symbols]
31 rotor core 31a dovetail groove 31b pole core 31c outer surface of pole core 31d U-shaped groove 31e V-shaped groove 31e-1 V-shaped groove bottom 31e-2 End of V-shaped groove 32 permanent magnet 33 rotor 34 stator 35 rotating shaft

Claims (4)

ロータ鉄心の外周面に形成した複数のあり溝にそれぞれ永久磁石を嵌合してなる構成のロータと、このロータの周囲を囲むように配置したステータとを有する永久磁石形回転電機において、
ロータ鉄心周方向にて隣合う前記あり溝の間の極間鉄心の外表面に溝を形成したことを特徴とする永久磁石形回転電機。In a permanent magnet type rotating electric machine having a rotor having a configuration in which permanent magnets are fitted into a plurality of dovetail grooves formed on an outer peripheral surface of a rotor core, and a stator arranged to surround the periphery of the rotor,
A permanent magnet type rotating electric machine, wherein a groove is formed on an outer surface of a pole core between said dovetail grooves adjacent in a circumferential direction of a rotor core. 請求項１に記載の永久磁石形回転電機において、
前記極間鉄心の外表面に形成した溝は横断面形状がＵ字状であることを特徴とする永久磁石形回転電機。The permanent magnet type rotating electric machine according to claim 1,
A groove formed on the outer surface of the pole core has a U-shaped cross section. 請求項１に記載の永久磁石形回転電機において、
前記極間鉄心の外表面に形成した溝は横断面形状がＶ字状であることを特徴とする永久磁石形回転電機。The permanent magnet type rotating electric machine according to claim 1,
A groove formed in the outer surface of the pole core has a V-shaped cross section, and is a permanent magnet type rotating electric machine. 請求項３に記載の永久磁石形回転電機において、
前記Ｖ字状の溝の底部と両端部とに丸みをつけたことを特徴とする永久磁石形回転電機。The permanent magnet type rotating electric machine according to claim 3,
A permanent magnet type rotating electric machine wherein the bottom and both ends of the V-shaped groove are rounded.
JP2002206507A 2002-07-16 2002-07-16 Permanent-magnet rotary-electric machine Pending JP2004048970A (en)

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