JP3654377B2 - Inner magnet type synchronous motor - Google Patents

Inner magnet type synchronous motor Download PDF

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Publication number
JP3654377B2
JP3654377B2 JP34643895A JP34643895A JP3654377B2 JP 3654377 B2 JP3654377 B2 JP 3654377B2 JP 34643895 A JP34643895 A JP 34643895A JP 34643895 A JP34643895 A JP 34643895A JP 3654377 B2 JP3654377 B2 JP 3654377B2
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Prior art keywords
hole
rotor
synchronous motor
permanent magnet
rotor core
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JPH09163648A (en
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恭祐 宮本
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Yaskawa Electric Corp
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Yaskawa Electric Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、ロータに永久磁石を設けた内磁形同期モータに関し、とくに、永久磁石をロータ鉄心の内部に埋め込んだロータを有する内磁形同期モータに関する。
【０００２】
【従来の技術】
従来、永久磁石をロータ鉄心の内部に埋め込んだロータ、すなわち内磁形のロータを備えた内磁形同期モータは、例えば図７に示すように、円周方向に複数の電機子を配列したステータ１を備え、ステータ１の内側には、内磁形のロータ２を空隙を介して対向させたものが開示されている（例えば、特開平５−７６１４６号公報、特開平７−２００５００号公報）。
この内磁形のロータ２は、例えば図８に示すように、ロータ鉄心２１の表面近くに回転方向に沿い、かつ軸方向に伸びる複数の装着穴２２を設け、その装着穴２２の中に永久磁石３を装着し、隣り合う永久磁石３が径方向に互いに逆極性になるように着磁されている。さらに、隣り合う装着穴２２の間に漏洩磁束防止のための扇形穴２３を設けている。したがって、永久磁石３の外周側には突極部２４が形成され、突極部２４と永久磁石３の中心側に形成されたヨーク部２５とは、扇形穴２３とその両側の装着穴２２との間に形成された細い繋ぎ部２６によって繋がれている。
また、内磁形同期モータのロータで、磁束軸（ｄ軸）方向のインダクタンスＬd が、ｄ軸と磁気的に直交する軸（ｑ軸）方向のインダクタンスＬq より小さくなるようにロータ鉄心に溝を設けて、出力トルクが増加するようにしたものが開示されている（例えば、特開平７−３９０９１号公報）。
【０００３】
【発明が解決しようとする課題】
ところが、上記前者の従来技術では、永久磁石３を、ロータ鉄心２１に設けた装着穴２２に装着しているため、ロータ２が回転すると、永久磁石３に加わる遠心力が装着穴２２の間の繋ぎ部２６に集中し、とくに高速回転になると、断面積が小さい繋ぎ部２４が遠心力に耐えられずに破壊するという問題があり、機械的強度からモータの最高回転数が制限されるという問題があった。
また、上記後者の従来技術では、出力トルクは増加するが、永久磁石がロータの外周に接着などによって固定されているため、高速回転になると、接着剤の接着力が永久磁石の遠心力に耐えられず、永久磁石がロータから剥離してしまうという問題があった。
さらに、これらの内磁形同期モータでは、磁極の位置を検出する磁極センサからの位置信号のフィードバックによりステータの励磁を制御するクローズトループで駆動する場合は問題は少ないが、磁極センサからの位置信号のフィードバックなしのオープンループで駆動する場合は、外乱（瞬間的に加わる異常なトルク）が加わると、ロータとステータとの間の同期状態が崩れ、乱調を起こすという問題があった。
本発明は、高速回転が可能で、かつオープンループ駆動でも乱調が抑制される内磁形同期モータを提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
上記課題を解決するため、本発明は、次のようにしたものである、
請求項１の発明は、円周方向に複数の電機子を配列したステータと、前記ステータに空隙を介して対向させたロータとを備え、前記ロータが円筒状のロータ鉄心と、前記ロータ鉄心の表面近くに回転方向に沿って設け、かつ軸方向に伸びる複数の装着穴と、隣合う前記装着穴の間に設けた漏洩磁束防止用穴と、前記装着穴に装着した永久磁石とを有する内磁形同期モータにおいて、前記ロータ鉄心の前記永久磁石を挟んで外周側に形成した突極部と中心側に形成したヨーク部とを結合するダンパーバーを備え、前記装着穴は、前記ロータ鉄心の表面近くに回転方向に沿い、かつ軸方向に伸びる周方向穴と、前記周方向穴の中央部から前記永久磁石の磁束軸方向に沿って、中心に向かう方向と表面に向かう方向の両方に伸びる径方向穴と、前記径方向穴の両端に設けた広がり部とからなり、前記永久磁石は、前記周方向穴の両側に前記径方向穴を挟んで設けた二つの永久磁石からなり、前記ダンパーバーは、前記径方向穴と前記広がり部とに充填した直線部と、前記ロータ鉄心の両端面に設けて前記直線部に結合され、かつ軸方向端部にバランスウエイトを装着する短絡環部とからなることを特徴とするものである。
請求項２の発明は、前記短絡環部に、バランスウエイトを装着するための複数のタップ穴を設けたことを特徴とするものである。
請求項３の発明は、前記短絡環部に、円周方向に等間隔に複数の長溝を設けたことを特徴とするものである。
【０００５】
【発明の実施の形態】
以下、本発明を図に示す実施例について説明する。
図１は本発明の第１の実施例のロータを示す正断面図、図２は内磁形同期モータを示す側断面図である。
図において、１は円周方向に複数の電機子を配列したステータ、２はステータ１の内側に空隙を介して対向させた内磁形のロータである。
ロータ２はロータ鉄心２１と永久磁石３からなり、ロータ鉄心２１は、図３に示すように、外周表面近くに回転方向に沿い、かつ軸方向に伸びる周方向穴２２ａと、周方向穴２２ａの中央部からｄ軸方向に沿って、中心に向かう方向と表面に向かう方向の両方に伸びる径方向穴２２ｂからなる複数の装着穴２２を設けてある。径方向穴２２ｂの両端には楔形の広がり部２２ｃが形成されている。また、隣り合う装着穴２２の間に漏洩磁束防止のための扇形穴２３を設けてある。
したがって、装着穴２２の外周側には径方向穴２２ｂによってほぼ２分割された突極部２４が形成され、突極部２４と永久磁石３の中心側に形成されたヨーク部２５とは、扇形穴２３とその両側の装着穴２２との間に形成された細い繋ぎ部２６によって繋がれている。
【０００６】
永久磁石３は、図１に示すように、装着穴２２の両端に形成された周方向穴２２ａの中に径方向穴２２ｂの間隔を開けて２個装着されており、隣り合う装着穴２２に装着された永久磁石３が径方向に互いに逆極性になるように着磁されている。
４はダンパーバーで、二つの永久磁石３の間に形成された径方向穴２２ｂに、例えばアルミダイカストなどの方法により充填された軸方向に伸びる直線部４１と、ロータ鉄心２１の両端面で直線部４１と結合された短絡環部４２とから構成されている。
短絡環部４２には、図４に示すように、同心円状に等間隔に配列された位置にタップ穴４３を設け、バランスウエイト５を取りつけるようにしてある。
なお、ダンパーバー４の材質は銅、アルミニウム、ステンレス鋼など非磁性の良電導体からなるバーとリングを結合して形成してもよい。
したがって、直線部４１は径方向穴２２ｂの両端の楔形に形成された広がり部２２ｃにも埋め込まれるので、突極部２４とヨーク部２５とを広がり部２２ｃの楔効果により結合することになる。
【０００７】
このような構成により、突極部２４はダンパーバー４の直線部４１によってヨーク部２５と結合されるので、高速回転の場合に永久磁石の遠心力が大きくなっても、繋ぎ部２４が破壊することがなくなる。さらに、繋ぎ部２６の断面を小さくすることができ、漏洩磁束を少なくし、出力が増加する。
また、ダンパーバー４のダンパー効果により、外乱が加わっても乱調を抑制することができる。
なお、突極部２４を分割する径方向穴２２ｂを設けてあるので、ｄ軸方向のインダクタンスＬd が、ｄ軸と電気的に直交するｑ軸方向のインダクタンスＬq より小さくなる。
【０００８】
図５は本発明の第２の実施例のロータを示す正断面図、図６はその正面図である。
第１の実施例と異なる点は、径方向穴２２ｂの両端に楔形の広がり部２２ｃを形成する代わりに、径方向穴２２ｂの両端に径方向穴２２ｂの中央部分の幅より大きい直径の円弧状の広がり部２２ｃを形成するとともに、短絡環部４２に円周方向に等間隔に長溝４４を設け、パテ状のバランスウエイト５を接着などにより固定するようにした点である。
これにより、径方向穴２２ｂにダンパーバー４の直線部４１を装着したときに、広がり部２２ｃに鋭角の部分がないので、突極部２４およびヨーク部２５に応力の集中を起こさずに突極部２４とヨーク部２５を直線部４１によって結合させることができる。
また、短絡環部４２に長溝４４を設けてあるので、長溝４４の中に、他の部品と干渉することなく、簡単にバランスウエイト５を接着などにより取りつけることができる。
なお、上記実施例では、径方向穴２２ｂの両端に楔形あるいは円弧状の広がり部２２ｃを持つ係合部を設けた例について説明したが、広がり部２２ｃの形状は、直線部４１が装着されたときに楔効果を生じるものであれば、楔形あるいは円弧状に限るものではない。
【０００９】
【発明の効果】
以上述べたように、本発明によれば、次のような効果がある。
（１）ロータ鉄心の中に永久磁石とダンパーバーを装着し、かつダンパーバーの直線部によってロータ鉄心の突極部とヨーク部とを結合するようにしてをあるので、外乱が加わっても乱調を抑制することができると共に、高速回転で運転しても永久磁石の遠心力によって突極部の繋ぎ部が破損することがなくなる。したがって、高速回転が可能で特性の安定した内磁形同期モータを提供できる。
（２）ダンパーバーで短絡環部を構成しているので、前記短絡環部にバランスウエイトを取りつけることができる。
（３）前記短絡環部に、バランスウエイトを装着するための複数のタップ穴を設けているので、ネジで構成されるバランスウエイトを前記タップ穴に簡単にネジ締め固定できる。
（４）短絡環部に長溝を設けてあるので、長溝の中に、他の部品と干渉することなく、簡単にバランスウエイトを接着などにより取りつけることができる。
【図面の簡単な説明】
【図１】 本発明の第１の実施例の拡大したロータを示す正断面図である。
【図２】 本発明の第１の実施例を示す側断面図である。
【図３】 本発明の第１の実施例の拡大したロータ鉄心（永久磁石およびダンパーバーを装着する前の状態）を示す正面図である。
【図４】 本発明の第１の実施例の拡大したロータを示す正面図である。
【図５】 本発明の第２の実施例の拡大したロータを示す正断面図である。
【図６】 本発明の第２の実施例の拡大したロータを示す正面図である。
【図７】 従来例を示す側断面図である。
【図８】 従来例の拡大したロータを示す正断面図である。
【符号の説明】
１：ステータ、２：ロータ、２１：ロータ鉄心、２２：装着穴、２２ａ：周方向穴、２２ｂ：径方向穴、２２ｃ：広がり部、２３：扇形穴、２４：突極部、２５：ヨーク部、２６：繋ぎ部、３：永久磁石、４：ダンパーバー、４１：直線部、４２：短絡環部、４３：タップ穴、４４：長溝、５：バランスウエイト[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal magnet type synchronous motor having a rotor provided with a permanent magnet, and more particularly to an internal magnet type synchronous motor having a rotor in which a permanent magnet is embedded in a rotor iron core.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an internal magnetic synchronous motor including a rotor in which a permanent magnet is embedded in a rotor iron core, that is, an internal magnetic rotor, is a stator in which a plurality of armatures are arranged in a circumferential direction, for example, as shown in FIG. 1 and an inner magnet type rotor 2 facing each other through a gap is disclosed inside the stator 1 (for example, JP-A-5-76146, JP-A-7-200500). .
For example, as shown in FIG. 8, the inner magnet type rotor 2 is provided with a plurality of mounting holes 22 extending in the axial direction in the rotation direction near the surface of the rotor core 21, and the mounting holes 22 are permanently provided. A magnet 3 is attached and adjacent permanent magnets 3 are magnetized so as to have opposite polarities in the radial direction. Furthermore, a fan-shaped hole 23 is provided between adjacent mounting holes 22 to prevent leakage magnetic flux. Therefore, the salient pole portion 24 is formed on the outer peripheral side of the permanent magnet 3, and the salient pole portion 24 and the yoke portion 25 formed on the center side of the permanent magnet 3 include the fan-shaped hole 23 and the mounting holes 22 on both sides thereof. Are connected by a thin connecting portion 26 formed between them.
Further, in the rotor of the inner-magnet synchronous motor, the rotor iron core has an inductance L d in the direction of the magnetic flux axis (d-axis) smaller than an inductance L q in the direction of the axis (q-axis) magnetically orthogonal to the d-axis. There has been disclosed a structure in which a groove is provided to increase the output torque (for example, Japanese Patent Laid-Open No. 7-39091).
[0003]
[Problems to be solved by the invention]
However, in the former prior art, since the permanent magnet 3 is mounted in the mounting hole 22 provided in the rotor core 21, when the rotor 2 rotates, centrifugal force applied to the permanent magnet 3 is generated between the mounting holes 22. When concentrated at the connecting portion 26, especially when it rotates at high speed, there is a problem that the connecting portion 24 having a small cross-sectional area breaks without being able to withstand centrifugal force, and the maximum rotational speed of the motor is limited due to mechanical strength. was there.
In the latter prior art, the output torque increases. However, since the permanent magnet is fixed to the outer periphery of the rotor by bonding or the like, the adhesive force of the adhesive can withstand the centrifugal force of the permanent magnet when rotating at high speed. However, there was a problem that the permanent magnet was peeled off from the rotor.
Furthermore, these internal-magnet synchronous motors have few problems when driven by a closed loop that controls the excitation of the stator by feedback of the position signal from the magnetic pole sensor that detects the position of the magnetic pole, but the position signal from the magnetic pole sensor In the case of driving in an open loop without feedback, there is a problem that if a disturbance (abnormal torque that is instantaneously applied) is applied, the synchronization state between the rotor and the stator breaks down, resulting in turbulence.
An object of the present invention is to provide an internal-magnet synchronous motor that can be rotated at a high speed and suppresses turbulence even in open-loop driving.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is as follows.
The invention of claim 1 includes a stator in which a plurality of armatures are arranged in a circumferential direction, and a rotor opposed to the stator via a gap, wherein the rotor is a cylindrical rotor core, and the rotor core A plurality of mounting holes provided in the vicinity of the surface along the rotational direction and extending in the axial direction; leakage flux preventing holes provided between the adjacent mounting holes; and permanent magnets mounted in the mounting holes. The magnetic synchronous motor includes a damper bar that couples a salient pole portion formed on the outer peripheral side across the permanent magnet of the rotor core and a yoke portion formed on the center side, and the mounting hole is formed on the rotor core. A circumferential hole extending in the direction of rotation near the surface and extending in the axial direction, and extending from the center of the circumferential hole along the magnetic flux axis direction of the permanent magnet in both the direction toward the center and the direction toward the surface. Radial holes and said The permanent magnet is composed of two permanent magnets provided on both sides of the circumferential hole with the radial hole interposed therebetween, and the damper bar is formed of the radial hole. And a straight portion filled in the spreading portion, and a short-circuited ring portion provided on both end faces of the rotor core, coupled to the straight portion, and fitted with a balance weight at an axial end portion. Is.
The invention according to claim 2 is characterized in that a plurality of tap holes for mounting balance weights are provided in the short-circuit ring portion.
The invention of claim 3 is characterized in that a plurality of long grooves are provided at equal intervals in the circumferential direction in the short-circuiting ring portion.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 is a front sectional view showing a rotor according to a first embodiment of the present invention, and FIG. 2 is a side sectional view showing an internal magnet type synchronous motor.
In the figure, reference numeral 1 denotes a stator in which a plurality of armatures are arranged in the circumferential direction, and 2 denotes an inner magnet type rotor opposed to the inside of the stator 1 via a gap.
The rotor 2 is composed of a rotor core 21 and a permanent magnet 3. The rotor core 21 includes a circumferential hole 22a extending in the axial direction near the outer peripheral surface and extending in the axial direction, as shown in FIG. A plurality of mounting holes 22 each having a radial hole 22b extending in the direction toward the center and the direction toward the surface are provided along the d-axis direction from the central portion. Wedge-shaped spreading portions 22c are formed at both ends of the radial hole 22b. A fan-shaped hole 23 is provided between adjacent mounting holes 22 to prevent leakage magnetic flux.
Therefore, the salient pole part 24 substantially divided into two by the radial hole 22b is formed on the outer peripheral side of the mounting hole 22, and the salient pole part 24 and the yoke part 25 formed on the center side of the permanent magnet 3 are fan-shaped. It is connected by a thin connecting portion 26 formed between the hole 23 and the mounting holes 22 on both sides thereof.
[0006]
As shown in FIG. 1, two permanent magnets 3 are mounted in the circumferential holes 22 a formed at both ends of the mounting holes 22 with the radial holes 22 b being spaced apart. The mounted permanent magnets 3 are magnetized so as to have opposite polarities in the radial direction.
Reference numeral 4 denotes a damper bar. A linear portion 41 extending in the axial direction is filled in a radial hole 22b formed between two permanent magnets 3 by, for example, a method such as aluminum die casting, and straight at both end faces of the rotor core 21. It is comprised from the short circuit ring part 42 couple | bonded with the part 41. FIG.
As shown in FIG. 4, the short-circuited ring portion 42 is provided with tap holes 43 at positions arranged concentrically at equal intervals so that the balance weight 5 is attached.
The material of the damper bar 4 may be formed by connecting a bar made of a non-magnetic good conductor such as copper, aluminum, stainless steel and a ring.
Therefore, since the straight part 41 is also embedded in the widened part 22c formed in the wedge shape at both ends of the radial hole 22b, the salient pole part 24 and the yoke part 25 are coupled by the wedge effect of the widened part 22c.
[0007]
With such a configuration, the salient pole portion 24 is coupled to the yoke portion 25 by the straight portion 41 of the damper bar 4, so that the connecting portion 24 is broken even if the centrifugal force of the permanent magnet increases in the case of high speed rotation. Nothing will happen. Furthermore, the cross section of the connecting portion 26 can be reduced, the leakage magnetic flux is reduced, and the output is increased.
In addition, due to the damper effect of the damper bar 4, turbulence can be suppressed even when a disturbance is applied.
Since I am provided a radial hole 22b which divides the salient pole portion 24, an inductance L d of the d-axis direction is smaller than the inductance L q of the q-axis direction electrically orthogonal to the d-axis.
[0008]
FIG. 5 is a front sectional view showing a rotor according to a second embodiment of the present invention, and FIG. 6 is a front view thereof.
The difference from the first embodiment is that instead of forming wedge-shaped spreading portions 22c at both ends of the radial hole 22b, an arc shape having a diameter larger than the width of the central portion of the radial hole 22b at both ends of the radial hole 22b. In addition, a long groove 44 is provided in the short circuit ring portion 42 at equal intervals in the circumferential direction, and the putty-like balance weight 5 is fixed by adhesion or the like.
Thereby, when the straight portion 41 of the damper bar 4 is mounted in the radial hole 22b, there is no acute angle portion in the widened portion 22c, so that the salient pole without causing stress concentration in the salient pole portion 24 and the yoke portion 25. The portion 24 and the yoke portion 25 can be coupled by the straight portion 41.
In addition, since the long groove 44 is provided in the short-circuiting ring portion 42, the balance weight 5 can be easily attached to the long groove 44 by adhesion or the like without interfering with other components.
In the above-described embodiment, the example in which the engaging portion having the wedge-shaped or arc-shaped expanded portion 22c is provided at both ends of the radial hole 22b has been described. However, the shape of the expanded portion 22c is the linear portion 41 attached. As long as the wedge effect is sometimes generated, the shape is not limited to the wedge shape or the arc shape.
[0009]
【The invention's effect】
As described above, the present invention has the following effects.
(1) Since a permanent magnet and a damper bar are mounted in the rotor iron core, and the salient pole part of the rotor iron core and the yoke part are coupled by the straight part of the damper bar, even if a disturbance is applied, it is turbulent In addition, even when the motor is operated at a high speed, the connecting portion of the salient pole portion is not damaged by the centrifugal force of the permanent magnet. Therefore, it is possible to provide an internal magnet type synchronous motor that can rotate at high speed and has stable characteristics.
(2) Since the short-circuiting ring portion is constituted by the damper bar, a balance weight can be attached to the short-circuiting ring portion.
(3) Since the plurality of tap holes for attaching the balance weight are provided in the short-circuit ring portion, the balance weight constituted by screws can be easily screwed and fixed to the tap hole.
(4) Since the long groove is provided in the short-circuiting ring portion, the balance weight can be easily attached to the long groove by adhesion or the like without interfering with other parts.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing an enlarged rotor according to a first embodiment of the present invention.
FIG. 2 is a side sectional view showing a first embodiment of the present invention.
FIG. 3 is a front view showing an enlarged rotor core (a state before a permanent magnet and a damper bar are mounted) according to the first embodiment of the present invention.
FIG. 4 is a front view showing an enlarged rotor according to the first embodiment of the present invention.
FIG. 5 is a front sectional view showing an enlarged rotor according to a second embodiment of the present invention.
FIG. 6 is a front view showing an enlarged rotor according to a second embodiment of the present invention.
FIG. 7 is a side sectional view showing a conventional example.
FIG. 8 is a front sectional view showing an enlarged rotor of a conventional example.
[Explanation of symbols]
1: Stator, 2: Rotor, 21: Rotor core, 22: Mounting hole, 22a: Circumferential hole, 22b: Radial hole, 22c: Spreading part, 23: Fan-shaped hole, 24: Salient pole part, 25: Yoke part , 26: connecting portion, 3: permanent magnet, 4: damper bar, 41: linear portion, 42: short-circuited ring portion, 43: tapped hole, 44: long groove, 5: balance weight

Claims (3)

円周方向に複数の電機子を配列したステータと、前記ステータに空隙を介して対向させたロータとを備え、前記ロータが円筒状のロータ鉄心と、前記ロータ鉄心の表面近くに回転方向に沿って設け、かつ軸方向に伸びる複数の装着穴と、隣合う前記装着穴の間に設けた漏洩磁束防止用穴と、前記装着穴に装着した永久磁石とを有する内磁形同期モータにおいて、
前記ロータ鉄心の前記永久磁石を挟んで外周側に形成した突極部と中心側に形成したヨーク部とを結合するダンパーバーを備え、
前記装着穴は、前記ロータ鉄心の表面近くに回転方向に沿い、かつ軸方向に伸びる周方向穴と、前記周方向穴の中央部から前記永久磁石の磁束軸方向に沿って、中心に向かう方向と表面に向かう方向の両方に伸びる径方向穴と、前記径方向穴の両端に設けた広がり部とからなり、
前記永久磁石は、前記周方向穴の両側に前記径方向穴を挟んで設けた二つの永久磁石からなり、
前記ダンパーバーは、前記径方向穴と前記広がり部とに充填した直線部と、前記ロータ鉄心の両端面に設けて前記直線部に結合され、かつ軸方向端部にバランスウエイトを装着する短絡環部とからなることを特徴とする内磁形同期モータ。A stator in which a plurality of armatures are arranged in a circumferential direction; and a rotor opposed to the stator via a gap, the rotor being a cylindrical rotor core, and a rotational direction near a surface of the rotor core. In an internal magnet type synchronous motor having a plurality of mounting holes extending in the axial direction, a leakage magnetic flux preventing hole provided between the adjacent mounting holes, and a permanent magnet mounted in the mounting hole,
A damper bar that connects a salient pole part formed on the outer peripheral side across the permanent magnet of the rotor core and a yoke part formed on the center side,
The mounting hole has a circumferential hole extending in the rotational direction and extending in the axial direction near the surface of the rotor core, and a direction from the center of the circumferential hole toward the center along the magnetic flux axis direction of the permanent magnet. And a radial hole extending in both directions toward the surface, and a widened portion provided at both ends of the radial hole,
The permanent magnet consists of two permanent magnets provided on both sides of the circumferential hole with the radial hole in between,
The damper bar includes a straight portion filled in the radial hole and the widened portion, a short-circuit ring provided on both end surfaces of the rotor core, coupled to the straight portion, and having a balance weight attached to the axial end portion.磁形synchronous motor among characterized by comprising the part. 前記短絡環部に、バランスウエイトを装着するための複数のタップ穴を設けたことを特徴とする請求項１に記載の内磁形同期モータ。 2. The internal magnet type synchronous motor according to claim 1, wherein a plurality of tap holes for mounting balance weights are provided in the short-circuit ring portion . 前記短絡環部に、円周方向に等間隔に複数の長溝を設けたことを特徴とする請求項１に記載の内磁形同期モータ。The inner-magnet synchronous motor according to claim 1, wherein a plurality of long grooves are provided at equal intervals in the circumferential direction in the short-circuit ring portion.
JP34643895A 1995-12-11 1995-12-11 Inner magnet type synchronous motor Expired - Fee Related JP3654377B2 (en)

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