JP2003209941A - Self-starting, permanent-magnet, synchronous motor - Google Patents
Self-starting, permanent-magnet, synchronous motorInfo
- Publication number
- JP2003209941A JP2003209941A JP2002004111A JP2002004111A JP2003209941A JP 2003209941 A JP2003209941 A JP 2003209941A JP 2002004111 A JP2002004111 A JP 2002004111A JP 2002004111 A JP2002004111 A JP 2002004111A JP 2003209941 A JP2003209941 A JP 2003209941A
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- JP
- Japan
- Prior art keywords
- permanent magnet
- self
- slot
- synchronous motor
- inter
- 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.)
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- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、冷凍空調機器用の
電動圧縮機、エアコン、空気清浄機等の送風用その他の
電気機器に使用される自己始動形永久磁石式同期電動機
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-starting permanent magnet type synchronous motor used in electric compressors for refrigerating and air-conditioning equipment, air conditioners, air purifiers and other electric equipment for blowing air.
【0002】[0002]
【従来の技術】自己始動形永久磁石式同期電動機は、始
動時には回転子の始動用かご形導体により誘導電動機と
して作用し、回転子が同期速度付近に達すると永久磁石
がつくる回転子磁極によって同期速度に引き込まれて同
期速度に入るが、定速度運転性及び高効率性等優れた性
能を有しているため一般産業用その他に広く使用されて
おり、特に電動機の回転子構造についてはさまざまな改
良が施されてきた。2. Description of the Related Art A self-starting permanent magnet type synchronous motor acts as an induction motor by a starting squirrel cage conductor of a rotor at the time of starting, and when the rotor reaches a speed near a synchronous speed, it is synchronized by a rotor magnetic pole created by a permanent magnet. Although it is drawn into the speed and enters the synchronous speed, it is widely used for general industry and other purposes because of its excellent performance such as constant speed drivability and high efficiency, and especially for the rotor structure of electric motors. Improvements have been made.
【0003】自己始動形永久磁石式同期電動機の改良の
一例として、特開2001−37126公報に示されて
いるものがある。以下、図面を参照しながら上記自己始
動形永久磁石式同期電動機を説明する。An example of an improvement of a self-starting permanent magnet type synchronous motor is disclosed in Japanese Patent Laid-Open No. 2001-37126. Hereinafter, the self-starting permanent magnet synchronous motor will be described with reference to the drawings.
【0004】図6は、2極の例を示すものである。1は
回転子、2は回転子鉄心であり、回転子鉄心2の外周付
近に設けた複数個のスロット3に導体バー4を配設し、
前記導体バー4の両端を短絡環で短絡して始動用かご形
導体を形成している。短絡環は図示しないが、回転子鉄
心の軸方向の両端に配置された環状のアルミ等の導電性
材料よりなり、各々の導体バー4に接続されている。短
絡環は、導体バー4と一体で、ダイカスト等により成形
される。FIG. 6 shows an example of two poles. Reference numeral 1 is a rotor, 2 is a rotor core, and conductor bars 4 are arranged in a plurality of slots 3 provided in the vicinity of the outer periphery of the rotor core 2.
Both ends of the conductor bar 4 are short-circuited by a short-circuit ring to form a squirrel cage conductor. Although not shown, the short-circuit ring is made of a conductive material such as annular aluminum arranged at both ends of the rotor core in the axial direction, and is connected to each conductor bar 4. The short-circuit ring is formed integrally with the conductor bar 4 by die casting or the like.
【0005】また、前記導体バー4の内側に複数個の永
久磁石埋め込み用穴5が設けられ、永久磁石6が埋め込
まれている。7は永久磁石の異極間のスロット(以下、
「極間スロット」という)であり、他のスロットよりも
回転子内径側に伸びていて、極間スロット7と、永久磁
石埋め込み用穴5との間の距離を十分狭くすることによ
り、前記永久磁石埋め込み用穴5と極間スロット7との
間を磁気飽和させ、永久磁石による異極間の磁束短絡を
防止するように構成されている。A plurality of holes 5 for embedding permanent magnets are provided inside the conductor bar 4, and permanent magnets 6 are embedded therein. 7 is a slot between different poles of the permanent magnet (hereinafter,
It is referred to as "inter-polar slot") and extends toward the inner diameter side of the rotor more than the other slots, and the permanent gap can be sufficiently narrowed by sufficiently narrowing the distance between the inter-polar slot 7 and the permanent magnet embedding hole 5. The magnet embedding hole 5 and the interpolar slot 7 are magnetically saturated to prevent magnetic flux short circuit between different poles due to a permanent magnet.
【0006】従来、スロットの形状は、両側部に、回転
子内径側に向かってテーパ状になった直線部を持つ長穴
形状であり、極間スロット7の、永久磁石埋め込み用穴
5に近接した部分はかなり幅の狭い形状となっている。Conventionally, the shape of the slot is an elongated hole having straight portions that are tapered toward the inner diameter side of the rotor on both sides, and is close to the permanent magnet embedding hole 5 of the interpolar slot 7. The part that has been made has a fairly narrow shape.
【0007】[0007]
【発明が解決しようとする課題】以上のような従来の自
己始動形永久磁石式同期電動機においては、始動時に多
くの固定子巻線に流れる電流による磁束が回転子スロッ
トを鎖交することになるが、極間スロット7は、回転子
内径側に向かってテーパ状になった直線部を持ち、永久
磁石埋め込み用穴5に近接した部分で最も幅の狭い形状
となっているため、磁束は永久磁石埋め込み用穴5と極
間スロット7との間、及び、その付近を通りやすい。従
って、永久磁石部に大きな反磁界がかかりやすくなり、
永久磁石の不可逆減磁の恐れがあった。In the conventional self-starting permanent magnet type synchronous motor as described above, the magnetic flux due to the current flowing through many stator windings interlinks the rotor slots at the time of starting. However, since the inter-electrode slot 7 has a linear portion that is tapered toward the inner diameter side of the rotor and has the narrowest shape in the portion close to the permanent magnet embedding hole 5, the magnetic flux is permanent. It is easy to pass between the magnet embedding hole 5 and the inter-electrode slot 7 and its vicinity. Therefore, a large demagnetizing field is easily applied to the permanent magnet section,
There was a risk of irreversible demagnetization of the permanent magnet.
【0008】特に、永久磁石が希土類磁石の場合、永久
磁石内部に交番磁束が発生すれば、渦電流により、永久
磁石そのものが発熱する。希土類磁石、特に、ネオジウ
ム系の場合、高温時にクニック点が磁化力0に近づき、
保磁力も低下する。従って、さらに、永久磁石の不可逆
減磁の可能性が高くなる。Particularly, when the permanent magnet is a rare earth magnet, if an alternating magnetic flux is generated inside the permanent magnet, the permanent magnet itself generates heat due to the eddy current. In the case of rare earth magnets, especially neodymium magnets, the knick point approaches magnetizing force 0 at high temperature,
The coercive force also decreases. Therefore, the possibility of irreversible demagnetization of the permanent magnet is further increased.
【0009】本発明は、上記の課題を解決するものであ
り、永久磁石の磁束を減少させたりパーミアンスを低下
させたりすることにより特性を犠牲にすることなく、減
磁に対する耐力を高めた、信頼性の高い永久磁石式同期
電動機を提供することを目的とする。The present invention has been made to solve the above-mentioned problems, and has improved resistance to demagnetization without sacrificing the characteristics by reducing the magnetic flux of the permanent magnet or lowering the permeance. An object of the present invention is to provide a permanent magnet type synchronous motor having high performance.
【0010】[0010]
【課題を解決するための手段】上記目的を達成するため
に、極間スロットを、それぞれの永久磁石埋め込み用穴
に近接するまで延ばし、極間スロットの永久磁石埋め込
み用穴に近接する部分の最大幅が、極間スロットの永久
磁石埋め込み用穴に近接する部分より外側の部分の最小
幅より大きいことを特徴としたものである。In order to achieve the above object, the inter-electrode slots are extended until they are close to the respective permanent magnet embedding holes, and the portion of the inter-electrode slots which is close to the permanent magnet embedding holes is the maximum. It is characterized in that it is significantly larger than the minimum width of the portion of the inter-electrode slot outside the portion in the vicinity of the permanent magnet embedding hole.
【0011】[0011]
【発明の実施の形態】本願の請求項1に記載の発明は、
固定子鉄心に巻線を巻装した固定子と、前記固定子鉄心
の内径円筒面に対向して回転自在に保持され、回転子鉄
心の外周付近に設けた複数個のスロットに導体バーを配
設して、前記導体バーの内側に複数個の永久磁石埋め込
み用穴を設けて、永久磁石を埋め込んだ回転子とからな
る自己始動形永久磁石式同期電動機であって、極間スロ
ットは、それぞれの永久磁石埋め込み用穴に近接するま
で延び、極間スロットの回転子内周端と永久磁石埋め込
み用穴の端部との間に、極間スロット幅広部を形成する
ことを特徴としたものであり、始動時に固定子巻線に流
れる電流により発生する磁束が、前記極間スロットの最
小幅部を通り、永久磁石に与える影響を最小にするた
め、不可逆減磁を防ぐことができる。BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present application is
A stator in which windings are wound around a stator core, and conductor bars are arranged in a plurality of slots that are rotatably held in opposition to the inner cylindrical surface of the stator core and are provided near the outer periphery of the rotor core. A permanent magnet synchronous motor having a plurality of holes for embedding permanent magnets inside the conductor bar, the rotor having permanent magnets embedded therein, wherein the inter-electrode slots are It is characterized by forming a wide gap between poles between the rotor inner peripheral end of the gap between poles and the end of the hole for filling the permanent magnet. Therefore, the magnetic flux generated by the current flowing through the stator winding at the time of start-up passes through the minimum width portion of the inter-electrode slot and minimizes the effect on the permanent magnet, so that irreversible demagnetization can be prevented.
【0012】本願の請求項2に記載の発明は、極間スロ
ットの深さが、少なくとも極間スロットに隣接するスロ
ットよりも深く、かつ、隣接するスロットとの間に設け
られた歯部幅が略一定となるようにしたものであり、始
動時は、固定子巻線に流れる電流により発生する磁束が
導体バーに鎖交しやすく、同期運転時には、永久磁石の
磁束が有効に固定子鉄心に渡ることにより、始動性を高
め、かつ、同期運転時の効率を向上させる。In the invention according to claim 2 of the present application, the depth of the inter-electrode slot is deeper than at least the slot adjacent to the inter-electrode slot, and the width of the tooth portion provided between the adjacent slot is The magnetic flux generated by the current flowing in the stator windings is easily linked to the conductor bar at the time of start-up, and the magnetic flux of the permanent magnet effectively becomes the stator core during synchronous operation. By crossing over, the startability is improved and the efficiency during synchronous operation is improved.
【0013】本願の請求項3に記載の発明は、永久磁石
の、極間スロットに近接する部分の端部に、空気層を有
する請求項1または請求項2記載の自己始動形永久磁石
式同期電動機であって、極間スロットと永久磁石埋め込
み用穴との間の薄肉部で飽和し漏洩する磁束が直接永久
磁石にかかることを防ぎ、局部的な不可逆減磁を防止す
る。The invention according to claim 3 of the present application is the self-starting permanent magnet type synchronization according to claim 1 or 2, wherein an air layer is provided at the end of the portion of the permanent magnet adjacent to the inter-electrode slot. In the electric motor, magnetic flux that is saturated and leaks in the thin wall portion between the inter-pole slot and the permanent magnet embedding hole is prevented from being directly applied to the permanent magnet, and local irreversible demagnetization is prevented.
【0014】本願の請求項4に記載の発明は、空気層の
厚みは、永久磁石の厚みよりも小さい、請求項3記載の
自己始動形永久磁石式同期電動機であって、極間スロッ
トと永久磁石埋め込み用穴との間の薄肉部で飽和し漏洩
する磁束が直接永久磁石にかかることを防ぎ、局部的な
不可逆減磁を防止する。The invention according to claim 4 of the present application is the self-starting permanent magnet type synchronous motor according to claim 3, wherein the thickness of the air layer is smaller than the thickness of the permanent magnet. The magnetic flux which is saturated and leaks in the thin portion between the magnet embedding hole and the leaking magnetic flux is prevented from being directly applied to the permanent magnet, and local irreversible demagnetization is prevented.
【0015】本願の請求項5に記載の発明は、永久磁石
が希土類磁石である請求項1から請求項4のいずれか1
項に記載の自己始動形永久磁石式同期電動機であって、
エネルギー積が大きく、少ない永久磁石量で、多くの磁
束を発生させることができるため小型化、大出力化が可
能である。また、永久磁石素材が金属であるため、永久
磁石内部に渦電流が発生しやすいが、交番磁界が永久磁
石にかかりにくくなるため、不可逆減磁の発生の防止に
特に有効である。In the invention according to claim 5 of the present application, the permanent magnet is a rare earth magnet.
A self-starting permanent magnet synchronous motor according to item
Since the energy product is large and a large amount of magnetic flux can be generated with a small amount of permanent magnets, downsizing and high output are possible. Further, since the permanent magnet material is a metal, an eddy current is likely to be generated inside the permanent magnet, but an alternating magnetic field is less likely to be applied to the permanent magnet, which is particularly effective in preventing the occurrence of irreversible demagnetization.
【0016】本願の請求項6に記載の発明は、回転子鉄
心の軸方向両端または片端には端板が設けられ、前記端
板の、永久磁石に当接する部分、または、永久磁石と導
体バーの間に位置する部分に、放熱フィンが設けられ
た、自己始動形永久磁石式同期電動機であって、導体バ
ーに発生した熱が、固定子鉄心を介して永久磁石に伝わ
るのを防止し、永久磁石の温度上昇を押さえることがで
きるため、不可逆減磁を防止すると共に、熱による残留
磁束密度の低下も抑えることができる。According to a sixth aspect of the present invention, end plates are provided at both axial ends or one end of the rotor core, and the end plates are in contact with the permanent magnets, or the permanent magnets and the conductor bars. A self-starting permanent magnet type synchronous motor having a heat radiation fin provided in a portion located between and, in which heat generated in the conductor bar is prevented from being transmitted to the permanent magnet through the stator core, Since it is possible to suppress the temperature rise of the permanent magnet, it is possible to prevent irreversible demagnetization and also suppress the decrease in residual magnetic flux density due to heat.
【0017】本願の請求項7に記載の発明は、放熱フィ
ンは、端板の一部を切り起こすことで成ることを特徴と
する請求項6記載の自己始動形永久磁石式同期電動機で
あって、永久磁石保持用の端板と、放熱材を共用するこ
とができ、部品点数を少なくできる。The invention according to claim 7 of the present application is the self-starting permanent magnet type synchronous motor according to claim 6, wherein the radiation fin is formed by cutting and raising a part of the end plate. The heat dissipation material can be shared with the end plate for holding the permanent magnet, and the number of parts can be reduced.
【0018】本願の請求項8に記載の発明は、放熱フィ
ンは、導体バー及び短絡環と同時に一体としてダイカス
トしてなる請求項6記載の自己始動形永久磁石式同期電
動機であり、導体バー、短絡環、放熱フィンを同時に成
形できるため、工数及び部品点数を増加させず、放熱効
果を持つことが可能である。The invention according to claim 8 of the present application is the self-starting permanent magnet type synchronous motor according to claim 6, wherein the radiation fin is integrally die-cast at the same time as the conductor bar and the short-circuit ring. Since the short-circuit ring and the heat radiation fin can be molded at the same time, it is possible to have a heat radiation effect without increasing the number of processes and the number of parts.
【0019】本願の請求項9に記載の発明は、放熱フィ
ンは、回転によって翼としても働き、永久磁石に風があ
たるように設けられた、請求項6から請求項8のいずれ
か1項に記載の自己始動形永久磁石式同期電動機であっ
て、永久磁石に対し、風による冷却も併用することで、
永久磁石の温度上昇を抑えることが可能である。The invention according to claim 9 of the present application is the method according to any one of claims 6 to 8, wherein the heat radiation fins are provided so as to act also as blades by rotation, and the permanent magnets are exposed to wind. A self-starting permanent magnet synchronous motor described, in which cooling with wind is also used for the permanent magnet,
It is possible to suppress the temperature rise of the permanent magnet.
【0020】本願の請求項10に記載の発明は、請求項
1から請求項9のいずれか1項に記載の永久磁石式同期
電動機を搭載したことを特徴とする電動圧縮機であり、
信頼性の高い電動圧縮機とすることができる。The invention according to claim 10 of the present application is an electric compressor comprising the permanent magnet synchronous motor according to any one of claims 1 to 9,
A highly reliable electric compressor can be provided.
【0021】[0021]
【実施例】以下、本発明の実施例について、図1から図
5を用いて説明する。Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.
【0022】(実施例1)図1及び図2は、6極の回転
子を示すものである。11は回転子、12は回転子鉄心
であり、回転子鉄心12の外周付近に設けた複数個のス
ロット13に導体バー14を配設し、前記導体バー14
の両端を短絡環18で短絡して始動用かご形導体を形成
している。短絡環18は、回転子鉄心12の軸方向の両
端に配置された環状のアルミ等の導電性材料よりなり、
各々の導体バー14に接続されている。短絡環18は、
導体バー14と一体で、ダイカスト等により成形され
る。(Embodiment 1) FIGS. 1 and 2 show a 6-pole rotor. Reference numeral 11 is a rotor, and 12 is a rotor core. Conductor bars 14 are arranged in a plurality of slots 13 provided in the vicinity of the outer periphery of the rotor core 12, and the conductor bars 14 are provided.
Both ends of each are short-circuited by the short-circuit ring 18 to form a squirrel cage conductor. The short-circuit ring 18 is made of a conductive material such as annular aluminum arranged at both ends of the rotor core 12 in the axial direction,
It is connected to each conductor bar 14. The short circuit ring 18 is
It is formed integrally with the conductor bar 14 by die casting or the like.
【0023】また、前記導体バー14の内側に極数個、
すなわち6個の永久磁石埋め込み用穴15が設けられ、
永久磁石16が埋め込まれている。極間スロット17
は、他のスロット13よりも回転子内径側に伸びてい
て、極間スロット17と、永久磁石埋め込み用穴15と
の間の距離を十分狭くすることにより、前記永久磁石埋
め込み用穴15と極間スロット17との間を磁気飽和さ
せ、永久磁石16による異極間の磁束短絡を防止するよ
うに構成されている。Further, several poles are provided inside the conductor bar 14,
That is, six permanent magnet embedding holes 15 are provided,
The permanent magnet 16 is embedded. Gap slot 17
Extend toward the inner diameter side of the rotor more than the other slots 13, and by sufficiently narrowing the distance between the interpolar slot 17 and the permanent magnet embedding hole 15, the permanent magnet embedding hole 15 and the pole It is configured so as to magnetically saturate the space with the inter-slot 17 and prevent a magnetic flux short circuit between the different poles due to the permanent magnet 16.
【0024】回転子11の外周には、わずかな空隙を持
って固定子(図示せず)があり、固定子には、回転磁界
が発生するよう、巻線が施されており、前記巻線に通電
させることにより回転子11を回転させる。On the outer circumference of the rotor 11, there is a stator (not shown) with a slight gap, and the stator is wound so that a rotating magnetic field is generated. The rotor 11 is rotated by energizing the rotor.
【0025】始動時は、導体バー14に固定子に発生す
る磁束が鎖交することによりトルクを発生し、同期回転
速度においては、永久磁石16の磁束と固定子に発生す
る磁束との相互作用によりトルクを発生し、回転してい
る。At the time of starting, torque is generated by interlinking the magnetic flux generated in the stator with the conductor bar 14, and at the synchronous rotation speed, the interaction between the magnetic flux of the permanent magnet 16 and the magnetic flux generated in the stator. Generates torque and rotates.
【0026】ここで、極間スロット17は、それぞれの
永久磁石埋め込み用穴15に近接するまで延び、極間ス
ロット17の回転子内周端17iと永久磁石埋め込み用
穴15の端部との間に、回転子鉄心の薄肉部12bを形
成するように、極間スロット17の回転子内周端17i
の幅を、幅広としている。Here, the inter-pole slots 17 extend until they come close to the respective permanent magnet embedding holes 15, and between the rotor inner peripheral end 17i of the inter-pole slots 17 and the end of the permanent magnet embedding hole 15. The rotor inner peripheral end 17i of the inter-electrode slot 17 so as to form the thin portion 12b of the rotor core.
The width of is wide.
【0027】このとき、極間スロット17に隣接するス
ロット19(以下、「隣接スロット」という)と、極間
スロット17との間の回転子鉄心歯部12tの幅はほぼ
一定となるように、隣接スロット19の極間スロット1
7側の線と、極間スロット17の隣接スロット19側の
線とはほぼ平行となるようにし、かつ、極間スロット1
7の回転子内周端17iの幅広となる部分により、回転
子鉄心歯部12tの幅が小さくなることがないようにし
てある。すなわち、極間スロット17は、少なくとも隣
接スロット19よりも回転子内周側に深く、隣接スロッ
ト19の回転子内周端よりも更に内周部で、極間スロッ
ト17の幅が広くなるようにしている。これにより、回
転子鉄心歯部12tからさらに内周側に流れ込む磁束を
妨げないような構成となる。At this time, the width of the rotor core tooth portion 12t between the slot 19 adjacent to the interpolar slot 17 (hereinafter referred to as "adjacent slot") and the interpolar slot 17 is made substantially constant. Inter-pole slot 1 of adjacent slot 19
The line on the 7th side and the line on the adjacent slot 19 side of the interpolar slot 17 are substantially parallel to each other, and the interpolar slot 1
The widened portion of the rotor inner peripheral end 17i of No. 7 does not reduce the width of the rotor core tooth portion 12t. That is, the interpolar slot 17 is deeper at least in the inner circumferential side of the rotor than the adjacent slot 19, and the width of the interpolar slot 17 is wider in the inner circumferential portion than the inner circumferential end of the rotor of the adjacent slot 19. ing. As a result, the magnetic flux flowing from the rotor core tooth portion 12t to the inner peripheral side is not disturbed.
【0028】これにより、特に始動時に、多くの磁束が
回転子11に流れ込んだときに、多くの磁束が、導体バ
ー14や、極間スロット17の、回転子内周端17iよ
り回転子外周側にある、他の部分より幅が若干狭くなっ
た、くびれ部17nを通るため、永久磁石16にかかる
反磁界(減磁界)が小さくなる。また、永久磁石16
が、回転子内周側に深く埋め込まれている場合であって
も、極間スロット17の回転子内周端17iを幅広とす
ることにより、永久磁石端部の漏れ磁束を低減すること
ができ、極間スロット17だけが極端に大きくなること
を防ぐことも可能である。As a result, particularly when a large amount of magnetic flux flows into the rotor 11 at the time of starting, a large amount of magnetic flux is generated from the rotor inner peripheral end 17i of the conductor bar 14 and the inter-electrode slot 17 on the rotor outer peripheral side. In FIG. 3, the demagnetizing field (demagnetizing field) applied to the permanent magnet 16 is reduced because it passes through the constricted portion 17n, which has a width slightly narrower than the other portions. In addition, the permanent magnet 16
However, even when it is deeply embedded in the rotor inner peripheral side, the leakage magnetic flux at the end of the permanent magnet can be reduced by widening the rotor inner peripheral end 17i of the inter-pole slot 17. It is also possible to prevent only the inter-electrode slot 17 from becoming extremely large.
【0029】なお、永久磁石16の、極間スロット17
に近接する部分の端部に、空気層20を設け、空気層2
0の厚みを永久磁石16の厚みと同等以下とすることに
より、回転子鉄心の薄肉部12bから漏れた磁束が、永
久磁石16より空気層20をより好んで通ることにな
り、永久磁石16が減磁しにくくなる。なお、本実施例
においては、空気層20の厚みは、永久磁石16に近接
する部分からテーパ状に幅を狭くしている。The interpolar slot 17 of the permanent magnet 16 is provided.
The air layer 20 is provided at the end of the portion close to the
By setting the thickness of 0 to be equal to or less than the thickness of the permanent magnet 16, the magnetic flux leaking from the thin portion 12b of the rotor core passes through the air layer 20 more favorably than the permanent magnet 16, and It becomes difficult to demagnetize. In this embodiment, the thickness of the air layer 20 is tapered from the portion close to the permanent magnet 16.
【0030】ここで、永久磁石16が希土類である場
合、導電率が高いため、永久磁石16内部に渦電流が発
生しやすく、温度が上昇しやすいが、永久磁石16にか
かる交番磁界が小さくなれば、温度上昇を抑えることが
可能である。希土類磁石の中でも、特にネオジウム系
は、高温で不可逆減磁を発生させるため、永久磁石16
の温度上昇は極力抑える必要がある。Here, when the permanent magnet 16 is a rare earth, since the conductivity is high, an eddy current is likely to be generated inside the permanent magnet 16 and the temperature tends to rise, but the alternating magnetic field applied to the permanent magnet 16 can be reduced. If so, it is possible to suppress the temperature rise. Among rare earth magnets, neodymium-based magnets in particular generate irreversible demagnetization at high temperatures, so permanent magnets 16
It is necessary to suppress the temperature rise of as much as possible.
【0031】永久磁石16の温度上昇の原因には、上記
の渦電流によるものと、導体バー14の発熱が、回転子
鉄心12を介して永久磁石16にまで伝導するものがあ
る。後者の原因による永久磁石16の発熱についても対
策をする必要がある。The cause of the temperature rise of the permanent magnet 16 is caused by the above-mentioned eddy current, and the heat generated by the conductor bar 14 is conducted to the permanent magnet 16 through the rotor core 12. It is necessary to take measures against the heat generation of the permanent magnet 16 due to the latter cause.
【0032】永久磁石16の軸方向の固定のために、回
転子鉄心12の軸方向両端に端板21を用いる。端板
は、片側は、永久磁石16を埋め込む前に設けても良い
が、少なくとも一方は、永久磁石16の埋め込みが可能
なように、導体バー14と短絡環18をダイカストした
後に永久磁石16を埋設し、端板を設ける必要がある。
前者の端板は、導体バー14が流入するような穴を設け
る必要があるが、同時に、導体が永久磁石埋め込み用穴
15に入り込むことを防止する働きもある。永久磁石1
6を埋め込む側の短絡環18は、少なくとも、永久磁石
埋め込み用穴15を避けて成形しなければならない。以
下に説明する端板の構成は、後者の、永久磁石16を埋
め込む側の端板に適用するのが良い。In order to fix the permanent magnet 16 in the axial direction, end plates 21 are used at both axial ends of the rotor core 12. The end plate may be provided on one side before the permanent magnet 16 is embedded, but on at least one end plate, the permanent magnet 16 is attached after the conductor bar 14 and the short-circuit ring 18 are die-cast so that the permanent magnet 16 can be embedded. It is necessary to bury it and provide an end plate.
The former end plate needs to be provided with a hole through which the conductor bar 14 flows, but at the same time, it also has a function of preventing the conductor from entering the permanent magnet embedding hole 15. Permanent magnet 1
The short-circuit ring 18 on the side where 6 is embedded must be formed so as to avoid at least the hole 15 for embedding the permanent magnet. The configuration of the end plate described below is preferably applied to the latter end plate on the side where the permanent magnet 16 is embedded.
【0033】端板21の、永久磁石16に当接する部
分、または、永久磁石16と導体バー14の間に位置す
る部分に放熱フィン22が設けられている。これによ
り、導体バー14の熱が、永久磁石16に伝導する際、
放熱フィン22から放熱されるため、永久磁石16の発
熱を抑えることができる。Radiating fins 22 are provided on a portion of the end plate 21 that is in contact with the permanent magnet 16 or a portion located between the permanent magnet 16 and the conductor bar 14. Thereby, when the heat of the conductor bar 14 is conducted to the permanent magnet 16,
Since the heat is dissipated from the heat dissipating fins 22, heat generation of the permanent magnet 16 can be suppressed.
【0034】この放熱フィン22は、図3(a)に示す
ように、端板21に切り込み23を入れて、図3(b)
のように起こすことで構成すれば、加工が容易であり、
別の部品を必要としない。As shown in FIG. 3 (a), this heat radiation fin 22 has a cutout 23 formed in the end plate 21 to form a cutout 23 in FIG. 3 (b).
If it is configured by raising like this, processing is easy,
No separate parts needed.
【0035】また、放熱フィン22は、半径方向と直交
する方向からわずかにずらしてあるので、回転方向を図
3(b)のRの方向に回したとき、ファンの役割を果た
し、風を永久磁石16に当てることができる。永久磁石
16の、極間スロット17に近接する部分の端部に空気
層20があるため、空気層20を風が通れば、永久磁石
16の冷却作用も増大する。この場合、反対側の端板2
1にも、風穴が必要である。また、この風穴は、永久磁
石16と導体バー14の間に設けても良い。Further, since the heat radiation fins 22 are slightly displaced from the direction orthogonal to the radial direction, when the rotation direction is rotated in the direction of R in FIG. It can be applied to the magnet 16. Since the air layer 20 exists at the end of the portion of the permanent magnet 16 that is close to the interpolar slot 17, if the air passes through the air layer 20, the cooling action of the permanent magnet 16 also increases. In this case, the opposite end plate 2
No. 1 also needs air holes. Further, this air hole may be provided between the permanent magnet 16 and the conductor bar 14.
【0036】更に、短絡環18の端部に短絡環18の成
形と同時に放熱フィン24を設けても良く、これは、冷
却用の翼としても働くことが可能である。Further, the radiation fins 24 may be provided at the end of the short-circuit ring 18 at the same time when the short-circuit ring 18 is formed, and this can also serve as a cooling blade.
【0037】(実施例2)図4は、2極の回転子を示す
ものである。31は回転子、32は回転子鉄心であり、
回転子鉄心32の外周付近に設けた複数個のスロット3
3に導体バー34を配設し、前記導体バー34の両端を
短絡環(図示せず)で短絡して始動用かご形導体を形成
している。短絡環は、回転子鉄心の軸方向の両端に配置
された環状のアルミ等の導電性材料よりなり、各々の導
体バー34に接続されている。短絡環は、導体バー34
と一体で、ダイカスト等により成形される。(Embodiment 2) FIG. 4 shows a two-pole rotor. 31 is a rotor, 32 is a rotor core,
A plurality of slots 3 provided near the outer circumference of the rotor core 32
3, a conductor bar 34 is disposed, and both ends of the conductor bar 34 are short-circuited by a short-circuit ring (not shown) to form a squirrel cage conductor for starting. The short-circuit ring is made of a conductive material such as annular aluminum arranged at both ends of the rotor core in the axial direction, and is connected to each conductor bar 34. The short-circuit ring is a conductor bar 34.
It is integrally molded with die casting and the like.
【0038】また、前記導体バー34の内側に極数個の
2倍、すなわち4個の永久磁石埋め込み用穴35が設け
られ、永久磁石36が埋め込まれている。すなわち、永
久磁石2個が同一の極性を持つことにより、1つの極を
形成している。37は永久磁石の異極間のスロット(以
下、「極間スロット」という)であり、他のスロットよ
りも回転子内径側に伸びていて、極間スロット37と、
永久磁石埋め込み用穴35との間の距離を十分狭くする
ことにより、前記永久磁石埋め込み用穴35と極間スロ
ット37との間を磁気飽和させ、永久磁石36による異
極間の磁束短絡を防止するように構成されている。Inside the conductor bar 34, twice as many as the number of poles, that is, four permanent magnet embedding holes 35 are provided, and permanent magnets 36 are embedded. That is, two permanent magnets have the same polarity to form one pole. Reference numeral 37 denotes a slot between different poles of the permanent magnet (hereinafter, referred to as “pole slot”), which extends toward the inner diameter side of the rotor more than other slots,
By sufficiently narrowing the distance between the permanent magnet embedding hole 35 and the permanent magnet embedding hole 35, the space between the permanent magnet embedding hole 35 and the interpolar slot 37 is magnetically saturated, and magnetic flux short circuit between different poles by the permanent magnet 36 is prevented. Is configured to.
【0039】ここで、極間スロット37は、それぞれの
永久磁石埋め込み用穴35に近接するまで延び、極間ス
ロット37の回転子内周端37iと永久磁石埋め込み用
穴35の端部との間に、回転子鉄心の薄肉部32bを形
成するように、極間スロット37の回転子内周端37i
の幅を、幅広としている。Here, the inter-pole slots 37 extend until they come close to the respective permanent magnet embedding holes 35, and between the rotor inner peripheral end 37i of the inter-pole slots 37 and the end of the permanent magnet embedding hole 35. The rotor inner peripheral end 37i of the inter-electrode slot 37 so as to form the thin portion 32b of the rotor core.
The width of is wide.
【0040】図5は、永久磁石36を埋め込む側と反対
側の端部に設ける端板41の形状を示す。端板41は、
永久磁石36の磁束の漏れを防止するため、SUSや真
鍮等、非磁性体であることが望ましいが、固定子鉄心を
形成する電磁鋼板の板厚が十分に薄い場合は、回転子鉄
心32の打ち抜きと同時に所定の形状(永久磁石埋め込
み用穴のみ省いた形状)で打ち抜けば、工数が削減でき
る。FIG. 5 shows the shape of the end plate 41 provided at the end opposite to the side where the permanent magnet 36 is embedded. The end plate 41 is
In order to prevent the leakage of the magnetic flux of the permanent magnet 36, it is desirable to use a non-magnetic material such as SUS or brass, but if the thickness of the electromagnetic steel sheet forming the stator core is sufficiently thin, the rotor core 32 The number of man-hours can be reduced by punching at the same time as punching in a predetermined shape (shape in which only the permanent magnet embedding hole is omitted).
【0041】このとき、極間スロット37に隣接するス
ロット39(以下、「隣接スロット」という)と、極間
スロット37との間の回転子鉄心歯部32tの幅はほぼ
一定となるように、隣接スロット39の極間スロット3
7側の線と、極間スロット37の隣接スロット39側の
線とはほぼ平行となるようにし、かつ、極間スロット3
7の回転子内周端37iの幅広となる部分により、回転
子鉄心歯部32tの幅が小さくなることが無いようにし
てある。すなわち、極間スロット37は、少なくとも隣
接スロット39よりも回転子内周側に深く、隣接スロッ
ト39の回転子内周端よりも更に内周部で、極間スロッ
ト37の幅が広くなるようにしている。At this time, the width of the rotor core tooth portion 32t between the slot 39 (hereinafter referred to as "adjacent slot") adjacent to the interpolar slot 37 and the interpolar slot 37 is substantially constant. Inter-pole slot 3 of adjacent slot 39
The line on the 7 side and the line on the adjacent slot 39 side of the inter-electrode slot 37 are substantially parallel to each other, and the inter-electrode slot 3
The width of the rotor core tooth portion 32t is not reduced by the widened portion of the rotor inner peripheral edge 37i of No. 7 in FIG. That is, the inter-electrode slot 37 is deeper on at least the inner peripheral side of the rotor than the adjacent slot 39, and the width of the inter-polar slot 37 is wider at the inner peripheral portion than the inner peripheral end of the rotor of the adjacent slot 39. ing.
【0042】本構成による作用と効果は、実施例1に示
したものと同様であるため省略する。The operation and effect of this structure are the same as those shown in the first embodiment, and will be omitted.
【0043】なお、2極の場合、必要に応じて、永久磁
石の数を変更することが可能である。例えば、3個の永
久磁石36で1極を形成しても良く、また、1個の永久
磁石36を円弧形状とし、1極を形成しても良い。In the case of two poles, the number of permanent magnets can be changed if necessary. For example, three permanent magnets 36 may form one pole, or one permanent magnet 36 may have an arc shape to form one pole.
【0044】なお、本発明は、上記実施例に限定される
ものではなく、極数、スロットの形状や数、永久磁石3
6の形状や数、配置等、本発明の趣旨に応じて変更が可
能である。The present invention is not limited to the above embodiment, but the number of poles, the shape and number of slots, and the permanent magnet 3 are not limited.
The shape, number, arrangement, etc. of 6 can be changed according to the spirit of the present invention.
【0045】[0045]
【発明の効果】上記説明から明らかなように、本願の請
求項1に記載の発明によれば、始動時に固定子巻線に流
れる電流により発生する磁束が、前記極間スロットの最
小幅部を通り、永久磁石に与える影響を最小にするた
め、不可逆減磁を防ぐことができる。As is apparent from the above description, according to the invention described in claim 1 of the present application, the magnetic flux generated by the current flowing through the stator winding at the time of starting causes the minimum width portion of the inter-electrode slot to As described above, irreversible demagnetization can be prevented because the influence on the permanent magnet is minimized.
【0046】本願の請求項2に記載の発明によれば、始
動時は、固定子巻線に流れる電流により発生する磁束が
導体バーに鎖交しやすく、同期運転時には、永久磁石の
磁束が有効に固定子鉄心に渡ることにより、始動性を高
め、かつ、同期運転時の効率を向上させる。According to the invention of claim 2 of the present application, the magnetic flux generated by the current flowing through the stator winding is easily linked to the conductor bar at the time of starting, and the magnetic flux of the permanent magnet is effective at the time of synchronous operation. By extending the stator core, the startability is improved and the efficiency in synchronous operation is improved.
【0047】本願の請求項3に記載の発明によれば、極
間スロットと永久磁石埋め込み用穴との間の薄肉部で飽
和し漏洩する磁束が直接永久磁石にかかることを防ぎ、
局部的な不可逆減磁を防止する。According to the invention of claim 3 of the present application, it is possible to prevent the magnetic flux saturated and leaking at the thin portion between the interpolar slot and the permanent magnet embedding hole from being directly applied to the permanent magnet,
Prevents local irreversible demagnetization.
【0048】本願の請求項4に記載の発明によれば、極
間スロットと永久磁石埋め込み用穴との間の薄肉部で飽
和し漏洩する磁束が直接永久磁石にかかることを防ぎ、
局部的な不可逆減磁を防止する。According to the invention of claim 4 of the present application, the magnetic flux saturated and leaking in the thin portion between the interpolar slot and the permanent magnet embedding hole is prevented from being directly applied to the permanent magnet,
Prevents local irreversible demagnetization.
【0049】本願の請求項5に記載の発明によれば、エ
ネルギー積が大きく、少ない永久磁石量で、多くの磁束
を発生させることができるため小型化、大出力化が可能
である。また、永久磁石素材が金属であるため、永久磁
石内部に渦電流が発生しやすいが、交番磁界が永久磁石
にかかりにくくなるため、不可逆減磁の発生の防止に特
に有効である。According to the invention of claim 5 of the present application, since a large energy product can be generated and a large amount of magnetic flux can be generated with a small amount of permanent magnets, miniaturization and large output can be achieved. Further, since the permanent magnet material is a metal, an eddy current is likely to be generated inside the permanent magnet, but an alternating magnetic field is less likely to be applied to the permanent magnet, which is particularly effective in preventing the occurrence of irreversible demagnetization.
【0050】本願の請求項6に記載の発明によれば、導
体バーに発生した熱が、固定子鉄心を介して永久磁石に
伝わるのを防止し、永久磁石の温度上昇を押さえること
ができるため、不可逆減磁を防止すると共に、熱による
残留磁束密度の低下も抑えることができる。According to the invention of claim 6 of the present application, the heat generated in the conductor bar can be prevented from being transmitted to the permanent magnet through the stator core, and the temperature rise of the permanent magnet can be suppressed. In addition to preventing irreversible demagnetization, it is possible to suppress a decrease in residual magnetic flux density due to heat.
【0051】本願の請求項7に記載の発明によれば、永
久磁石保持用の端板と、放熱材を共用することができ、
部品点数を少なくできる。According to the invention of claim 7 of the present application, the end plate for holding the permanent magnet can be shared with the heat dissipation member,
The number of parts can be reduced.
【0052】本願の請求項8に記載の発明によれば、導
体バー、短絡環、放熱フィンを同時に成形できるため、
工数及び部品点数を増加させず、放熱効果を持つことが
可能である。According to the invention of claim 8 of the present application, since the conductor bar, the short-circuit ring, and the radiation fin can be molded at the same time,
It is possible to have a heat dissipation effect without increasing the number of steps and the number of parts.
【0053】本願の請求項9に記載の発明によれば、永
久磁石に対し、風による冷却も併用することで、永久磁
石の温度上昇を抑えることが可能である。According to the invention of claim 9 of the present application, it is possible to suppress the temperature rise of the permanent magnet by using the cooling of the wind in combination with the permanent magnet.
【0054】また、上記特有の効果を有する永久磁石式
同期電動機を電動圧縮機に搭載することで、信頼性の高
い電動圧縮機を得ることができる。Further, by mounting the permanent magnet type synchronous motor having the above-mentioned unique effect on the electric compressor, a highly reliable electric compressor can be obtained.
【図1】本発明の実施例1記載の回転子の断面図FIG. 1 is a sectional view of a rotor according to a first embodiment of the present invention.
【図2】本発明の実施例1記載の回転子の斜視図FIG. 2 is a perspective view of the rotor according to the first embodiment of the present invention.
【図3】本発明の実施例1の回転子の端板を示す図FIG. 3 is a diagram showing an end plate of the rotor according to the first embodiment of the present invention.
【図4】本発明の実施例2記載の回転子の断面図FIG. 4 is a sectional view of a rotor according to a second embodiment of the present invention.
【図5】本発明の実施例2の回転子の端板を示す図FIG. 5 is a diagram showing an end plate of a rotor according to a second embodiment of the present invention.
【図6】従来の回転子の断面図FIG. 6 is a cross-sectional view of a conventional rotor
11 回転子 12 回転子鉄心 13 スロット 14 導体バー 15 永久磁石埋め込み用穴 16 永久磁石 17 極間スロット 17i 回転子内周端 18 短絡環 19 隣接スロット 20 空気層 21 端板 22 放熱フィン 23 切り込み 11 rotor 12 rotor core 13 slots 14 conductor bar 15 Permanent magnet embedding hole 16 permanent magnet 17 pole slot 17i rotor inner peripheral edge 18 short-circuit ring 19 adjacent slots 20 air layer 21 End plate 22 Radiation fin 23 notches
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浅野 能成 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Fターム(参考) 5H002 AA01 AB07 AC06 AE06 AE08 5H622 AA04 CA02 CA07 CA10 CA13 CB05 DD02 PP07 PP10 QA10 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Yoshinari Asano 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. F-term (reference) 5H002 AA01 AB07 AC06 AE06 AE08 5H622 AA04 CA02 CA07 CA10 CA13 CB05 DD02 PP07 PP10 QA10
Claims (10)
前記固定子鉄心の内径円筒面に対向して回転自在に保持
され、回転子鉄心の外周付近に設けた複数個のスロット
に導体バーを配設して、前記導体バーの内側に複数個の
永久磁石埋め込み用穴を設けて、永久磁石を埋め込んだ
回転子とからなる自己始動形永久磁石式同期電動機であ
って、異なる極の永久磁石が埋設される永久磁石埋め込
み用穴の間に位置するスロット(以下、「極間スロッ
ト」と示す)は、それぞれの永久磁石埋め込み用穴に近
接するまで延び、極間スロットの回転子内周端と永久磁
石埋め込み用穴の端部との間に、回転子鉄心の薄肉部を
形成するように、極間スロットの回転子内周端を永久磁
石埋め込み用穴の端部付近まで幅を広げる(以下「極間
スロット幅広部」と示す)ことを特徴とした、自己始動
形永久磁石式同期電動機。1. A stator having a winding wound around a stator core,
The stator core is rotatably held so as to face the cylindrical surface of the inner diameter, and conductor bars are arranged in a plurality of slots provided near the outer periphery of the rotor core, and a plurality of permanent bars are provided inside the conductor bar. A self-starting permanent magnet type synchronous motor comprising a rotor having a magnet embedded hole and a permanent magnet embedded therein, the slot being located between the permanent magnet embedded holes in which permanent magnets of different poles are embedded. (Hereinafter referred to as “inter-pole slots”) extends until they come close to the respective permanent magnet embedding holes, and is rotated between the rotor inner peripheral end of the inter-pole slots and the end of the permanent magnet embedding hole. The width of the rotor inner peripheral end of the inter-electrode slot is increased to near the end of the permanent magnet embedding hole so as to form a thin portion of the child core (hereinafter referred to as "inter-pole slot wide part"). Self-starting permanent magnet synchronous Machine.
スロットに隣接するスロットよりも深く、かつ、隣接す
るスロットとの間に設けられた歯部幅が略一定となる、
請求項1記載の自己始動形永久磁石式同期電動機。2. The depth of the inter-electrode slot is at least deeper than the slot adjacent to the inter-electrode slot, and the width of the tooth portion provided between the inter-electrode slot and the adjacent slot is substantially constant.
The self-starting permanent magnet type synchronous motor according to claim 1.
分の端部に、空気層を有する請求項1または請求項2記
載の自己始動形永久磁石式同期電動機。3. The self-starting permanent magnet type synchronous motor according to claim 1, wherein an air layer is provided at an end of a portion of the permanent magnet adjacent to the inter-electrode slot.
小さい、請求項3記載の自己始動形永久磁石式同期電動
機。4. The self-starting permanent magnet type synchronous motor according to claim 3, wherein the thickness of the air layer is smaller than the thickness of the permanent magnet.
ら請求項4のいずれか1項に記載の自己始動形永久磁石
式同期電動機。5. The self-starting permanent magnet type synchronous motor according to claim 1, wherein the permanent magnet is a rare earth magnet.
前記固定子鉄心の内径円筒面に対向して回転自在に保持
され、回転子鉄心の外周付近に設けた複数個のスロット
に導体バーを配設して、前記導体バーの内側に複数個の
永久磁石埋め込み用穴を設けて、永久磁石を埋め込んだ
回転子とからなる自己始動形永久磁石式同期電動機であ
って、回転子鉄心の軸方向両端または片端には端板が設
けられ、前記端板の、永久磁石に当接する部分、また
は、永久磁石と導体バーの間に位置する部分に、放熱フ
ィンが設けられた、請求項5記載の自己始動形永久磁石
式同期電動機。6. A stator having a winding wound around a stator iron core,
The stator core is rotatably held so as to face the cylindrical surface of the inner diameter, and conductor bars are arranged in a plurality of slots provided near the outer periphery of the rotor core, and a plurality of permanent bars are provided inside the conductor bar. A self-starting permanent magnet type synchronous motor comprising a rotor having a magnet embedding hole and a permanent magnet embedded therein, wherein an end plate is provided at both axial ends or one end of the rotor core. 7. The self-starting permanent magnet type synchronous motor according to claim 5, wherein a heat radiation fin is provided at a portion of the contacting portion with the permanent magnet or a portion located between the permanent magnet and the conductor bar.
ことで成ることを特徴とする請求項6記載の自己始動形
永久磁石式同期電動機。7. The self-starting permanent magnet type synchronous motor according to claim 6, wherein the heat radiation fin is formed by cutting and raising a part of the end plate.
時に一体としてダイカストしてなる請求項6記載の自己
始動形永久磁石式同期電動機。8. The self-starting permanent magnet type synchronous motor according to claim 6, wherein the radiation fin is integrally die-cast together with the conductor bar and the short-circuit ring.
働き、永久磁石に風があたるように設けられた、請求項
6から請求項8のいずれか1項に記載の自己始動形永久
磁石式同期電動機。9. The self-starting permanent magnet type synchronization according to claim 6, wherein the radiation fin also functions as a wing by rotation and is provided so that the permanent magnet is exposed to wind. Electric motor.
に記載の永久磁石式同期電動機を搭載したことを特徴と
する電気機器。10. An electric device equipped with the permanent magnet type synchronous motor according to any one of claims 1 to 9.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002004111A JP2003209941A (en) | 2002-01-11 | 2002-01-11 | Self-starting, permanent-magnet, synchronous motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002004111A JP2003209941A (en) | 2002-01-11 | 2002-01-11 | Self-starting, permanent-magnet, synchronous motor |
Publications (1)
Publication Number | Publication Date |
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JP2003209941A true JP2003209941A (en) | 2003-07-25 |
Family
ID=27643528
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7365466B2 (en) | 2004-12-20 | 2008-04-29 | Danfoss Compressors Gmbh | Rotor for an electrical motor |
US7612481B2 (en) | 2004-12-20 | 2009-11-03 | Danfoss Compressors Gmbh | Rotor with a cover plate for securing a magnet in the rotor |
US7619343B2 (en) | 2004-12-20 | 2009-11-17 | Danfoss Compressors Gmbh | Rotor for an electrical motor |
WO2012036945A2 (en) * | 2010-09-15 | 2012-03-22 | Remy Technologies, L.L.C. | Permanent magnet rotor for electric machine |
CN107425689A (en) * | 2017-08-21 | 2017-12-01 | 伊泽瑞尔(大连)科技有限公司 | A kind of anti-demagnetization permanent magnet machine rotor |
CN112968555A (en) * | 2021-01-26 | 2021-06-15 | 珠海格力电器股份有限公司 | Rotor assembly and self-starting permanent magnet synchronous reluctance motor |
-
2002
- 2002-01-11 JP JP2002004111A patent/JP2003209941A/en not_active Withdrawn
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7365466B2 (en) | 2004-12-20 | 2008-04-29 | Danfoss Compressors Gmbh | Rotor for an electrical motor |
US7612481B2 (en) | 2004-12-20 | 2009-11-03 | Danfoss Compressors Gmbh | Rotor with a cover plate for securing a magnet in the rotor |
US7619343B2 (en) | 2004-12-20 | 2009-11-17 | Danfoss Compressors Gmbh | Rotor for an electrical motor |
WO2012036945A2 (en) * | 2010-09-15 | 2012-03-22 | Remy Technologies, L.L.C. | Permanent magnet rotor for electric machine |
WO2012036945A3 (en) * | 2010-09-15 | 2012-06-21 | Remy Technologies, L.L.C. | Permanent magnet rotor for electric machine |
CN103229393A (en) * | 2010-09-15 | 2013-07-31 | 雷米科技有限公司 | Permanent magnet rotor for electric machine |
US8749103B2 (en) | 2010-09-15 | 2014-06-10 | Remy Technologies, L.L.C. | Permanent magnet rotor for electric machine |
CN107425689A (en) * | 2017-08-21 | 2017-12-01 | 伊泽瑞尔(大连)科技有限公司 | A kind of anti-demagnetization permanent magnet machine rotor |
CN107425689B (en) * | 2017-08-21 | 2024-02-02 | 伊泽瑞尔(大连)科技有限公司 | Anti-demagnetizing permanent magnet motor rotor |
CN112968555A (en) * | 2021-01-26 | 2021-06-15 | 珠海格力电器股份有限公司 | Rotor assembly and self-starting permanent magnet synchronous reluctance motor |
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