JP2001086718A - Self-start type permanent-magnet synchronous motor and manufacture thereof - Google Patents
Self-start type permanent-magnet synchronous motor and manufacture thereofInfo
- Publication number
- JP2001086718A JP2001086718A JP25703399A JP25703399A JP2001086718A JP 2001086718 A JP2001086718 A JP 2001086718A JP 25703399 A JP25703399 A JP 25703399A JP 25703399 A JP25703399 A JP 25703399A JP 2001086718 A JP2001086718 A JP 2001086718A
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- Prior art keywords
- rotor
- permanent magnet
- stator
- core
- short
- 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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- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、冷凍空調機器用電
動圧縮機やその他の一般産業用に使用される自己始動形
永久磁石式同期電動機とその製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-starting permanent magnet type synchronous motor used for electric compressors for refrigeration and air conditioning equipment and other general industries, and a method of manufacturing the same.
【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
して作動し、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、定速度運転性およ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 type permanent magnet synchronous motor operates as an induction motor by a squirrel-cage conductor for starting a rotor at the time of starting, and is synchronized by a rotor magnetic pole created by a permanent magnet when the rotor reaches a speed near a synchronous speed. 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 operation and high efficiency. Improvements have been made.
【０００３】従来の自己始動形永久磁石式同期電動機の
回転子は一般的に、特公昭５９−２３１７９号公報に示
されているものがある。以下、図面を参照しながら上記
従来の自己始動形永久磁石式同期電動機を説明する。A conventional self-starting type permanent magnet synchronous motor rotor is generally disclosed in Japanese Patent Publication No. 59-23179. Hereinafter, the conventional self-starting type permanent magnet synchronous motor will be described with reference to the drawings.
【０００４】図２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。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
異極間の磁束短絡防止用スリットであり、前記磁束短絡
防止用スリット７と永久磁石埋め込み用穴５との間の距
離Ｐ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と前記磁束短絡防止用スリット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。FIG. 2 shows an example of two poles. 1 is a rotor, 2 is a rotor core, a conductor bar 4 is arranged in a plurality of slots 3 provided near the outer periphery of the rotor core 2, and both ends of the conductor bar 4 are short-circuited by short-circuit rings. A starting cage conductor is formed. Although not shown, the short-circuit ring is made of a ring-shaped conductive material disposed at both axial ends of the rotor core, and is connected to each conductor bar 4. A plurality of holes 5 for embedding permanent magnets are provided inside the conductor bar 4, and permanent magnets 6 are embedded therein. Reference numeral 7 denotes a slit for preventing magnetic flux short-circuiting between different poles of the permanent magnet, and by sufficiently reducing a distance P between the slit 7 for preventing magnetic flux short-circuiting and the hole 5 for embedding the permanent magnet, It is configured to magnetically saturate between the magnetic flux shorting 5 and the magnetic flux short-circuit prevention slit 7 to prevent magnetic flux short-circuiting between different poles by a permanent magnet.
【０００５】従来、回転子鉄心２の隣り合うスロット４
の間の距離Ｔ１は各々の箇所で一定の大きさであった。
また、スロット４の径方向長さＨ１も一定であり、回転
子鉄心２がこのような形状の場合、回転子磁極の端付近
に位置する隣り合うスロットの間の距離Ｔやスロット３
と永久磁石埋め込み用穴５の間の距離Ｙ１は十分広い磁
路幅を有しているため、永久磁石６から涌出する磁束
は、回転子磁極の端付近の外周面にも他の箇所の外周面
とほぼ同程度に流出することになる。その結果、固定子
の巻線に電圧を印加せず、巻線による磁界が回転子にか
かっていない状態での固定子と回転子の間の空隙部の磁
束密度分布は、縦軸を磁束密度Ｂｇとし、横軸を回転子
磁極の極間を原点としたときの空隙部の回転方向の角度
θとした場合に、図３に示すように矩形波となる。この
ことにより空隙部の磁束密度分布は高調波成分を多く含
むため、鉄損が大きく電動機の効率は低い値に留まって
おり、また電動機の騒音も高い状況にある。Conventionally, adjacent slots 4 of the rotor core 2
The distance T1 was constant at each location.
Further, the radial length H1 of the slot 4 is also constant, and when the rotor core 2 has such a shape, the distance T between the adjacent slots located near the end of the rotor magnetic pole and the slot 3
Since the distance Y1 between the permanent magnet and the hole 5 for embedding the permanent magnet has a sufficiently wide magnetic path width, the magnetic flux coming out of the permanent magnet 6 causes the outer peripheral surface near the end of the rotor magnetic pole to reach other places. It will flow out to the same extent as the outer peripheral surface. As a result, the magnetic flux density distribution in the air gap between the stator and the rotor when no voltage is applied to the stator winding and the magnetic field generated by the winding is not applied to the rotor has the vertical axis representing the magnetic flux density. Bg, and when the horizontal axis is the angle θ in the rotation direction of the gap when the origin is the distance between the rotor magnetic poles, a rectangular wave is formed as shown in FIG. As a result, the magnetic flux density distribution in the air gap portion contains many harmonic components, so that the iron loss is large and the efficiency of the motor remains at a low value, and the noise of the motor is also high.
【０００６】[0006]
【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、回転子鉄心
の全てのスロットの間の距離が一定であり、且つ全ての
スロットの径方向長さも一定であるため、固定子の巻線
に電圧を印加せず、巻線による磁界が回転子にかかって
いない状態での固定子と回転子の間の空隙部の磁束密度
分布は矩形波となる。このことにより空隙部の磁束密度
分布は高調波成分を多く含んでいるため、鉄損が大きく
電動機は高い効率が得られず、また電動機の騒音も高い
という課題があった。In the conventional self-starting permanent magnet synchronous motor as described above, the distance between all the slots of the rotor core is constant, and the radial length of all the slots is constant. Since the voltage is not applied to the stator winding and the magnetic field due to the winding is not applied to the rotor, the magnetic flux density distribution in the air gap between the stator and the rotor is Become. Due to this, since the magnetic flux density distribution in the air gap contains many harmonic components, there is a problem that the iron loss is large and the motor cannot obtain high efficiency, and the noise of the motor is high.
【０００７】本発明は上記の課題を解決するもので、固
定子と回転子の間の空隙部の磁束密度分布を正弦波にす
ることによって空隙部の磁束密度分布の高調波成分を無
くして鉄損を低減することにより高い効率が得られ、且
つ低騒音の自己始動形永久磁石式同期電動機とその製造
方法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 the magnetic flux density distribution in the air gap between the stator and the rotor is made to be a sine wave so that harmonic components of the magnetic flux density distribution in the air gap can be eliminated. It is an object of the present invention to provide a self-starting permanent magnet type synchronous motor that achieves high efficiency by reducing loss and has low noise, and a method of manufacturing the same.
【０００８】[0008]
【課題を解決するための手段】この目的を達成するため
に本発明は、回転子鉄心の外周に配置された任意の方向
の磁化容易軸を持つ等方性のリング状の永久磁石の同一
極内の磁化方向が、回転子の軸に垂直な断面において極
の中心と回転子の軸の中心を結ぶ線に全て平行となるよ
うに平行磁場をかけて２極に着磁する。SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides an isotropic ring-shaped permanent magnet having an easy axis of magnetization in an arbitrary direction and arranged on the outer periphery of a rotor core. A parallel magnetic field is applied to the two poles so that the magnetization directions in the inside are all parallel to a line connecting the center of the pole and the center of the rotor axis in a cross section perpendicular to the axis of the rotor.
【０００９】固定子の巻線に電圧を印加せず、巻線によ
る磁界が回転子にかかっていない状態での空隙部の磁束
密度分布について図４と図５を用いて説明する。The distribution of the magnetic flux density in the air gap when no voltage is applied to the winding of the stator and no magnetic field is applied to the rotor will be described with reference to FIGS. 4 and 5. FIG.
【００１０】図４において１は回転子、２は回転子鉄心
である。回転子鉄心２の外周を覆うように等方性のリン
グ状の永久磁石６を配置している。回転子鉄心２の外周
付近に複数個の導体バー４を配設するためのスロット３
を設け、アルミダイカストにより前記導体バー４と回転
子鉄心の軸方向の両端の短絡環（図示せず）を一体成型
して始動用かご形導体を形成している。回転子の表面の
極間を原点とし、回転方向の角度がθである点をＰ点と
した場合、回転子の表面上のＰ点での磁束密度Ｂは極の
中心１０と回転子の軸９の中心を結ぶ線Ａ−Ａ’に平行
であり、径方向の成分Ｂｒとθ方向の成分Ｂθに分けら
れる。Ｂｒは式（１）で表わされる。In FIG. 4, 1 is a rotor, and 2 is a rotor core. An isotropic ring-shaped permanent magnet 6 is arranged so as to cover the outer periphery of the rotor core 2. Slot 3 for disposing a plurality of conductor bars 4 near the outer periphery of rotor core 2
The conductor bar 4 and short-circuit rings (not shown) at both ends in the axial direction of the rotor core are integrally formed by aluminum die casting to form a starting cage conductor. If the point between the poles on the surface of the rotor is the origin and the point where the angle in the rotation direction is θ is the point P, the magnetic flux density B at the point P on the surface of the rotor is the center 10 of the poles and the axis of the rotor. 9 is parallel to a line AA ′ connecting the centers of the nine components, and is divided into a radial component Br and a θ component Bθ. Br is represented by equation (1).
【００１１】Ｂｒ＝Ｂｓｉｎθ ………（１） 空隙部は非常に狭いため空隙部は回転子の表面から非常
に近い範囲の中にあるため、空隙部の磁束密度Ｂｇ
（θ）は回転子の表面の磁束密度に近い値となる。従っ
て、空隙部の磁束密度Ｂｇ（θ）は式（２）で表わされ
る。Br = Bsin θ (1) Since the gap is very narrow because the gap is very narrow from the surface of the rotor, the magnetic flux density Bg of the gap is
(Θ) is a value close to the magnetic flux density on the surface of the rotor. Therefore, the magnetic flux density Bg (θ) of the air gap is expressed by equation (2).
【００１２】Ｂｇ（θ）≒Ｂｒ ………（２） ここで、式（１）を代入すると Ｂｇ（θ）≒Ｂｓｉｎθ ………（３） となるため、Ｂがθに拘わらず一定となるように永久磁
石の径方向に平行磁場で着磁すると図５に示すように縦
軸を空隙部の磁束密度、横軸をθとした場合に空隙部の
磁束密度分布は正弦波となる。Bg (θ) ≒ Br (2) Here, when equation (1) is substituted, Bg (θ) ｓBsinθ (3), so that B is constant regardless of θ. When the permanent magnet is magnetized with a parallel magnetic field in the radial direction as shown in FIG. 5, the magnetic flux density distribution in the gap becomes a sine wave when the vertical axis is the magnetic flux density in the gap and the horizontal axis is θ.
【００１３】このことにより従来例に比べて空隙部の磁
束密度分布の高調波成分が無くなり鉄損を低減すること
ができるため、高効率で低騒音の２極の自己始動形永久
磁石式同期電動機とすることができる。As a result, higher harmonic components of the magnetic flux density distribution in the air gap can be eliminated and iron loss can be reduced as compared with the conventional example, so that a highly efficient, low noise, two-pole self-starting type permanent magnet type synchronous motor can be obtained. It can be.
【００１４】一方、ラジアル異方性の永久磁石を用いた
場合には極間を除いてＢｒはθに拘わらず一定であるた
め、回転子表面での磁束密度の分布は矩形波となる。こ
のことにより空隙部の磁束密度分布も矩形波となる。し
たがってラジアル異方性の永久磁石を用いた場合は空隙
部の磁束密度の高調波成分が大きく、電動機の効率は低
い値に留まり、また電動機の騒音も高い状況になる。On the other hand, when a radially anisotropic permanent magnet is used, Br is constant irrespective of θ except for the gap, so that the magnetic flux density distribution on the rotor surface is a rectangular wave. As a result, the magnetic flux density distribution in the gap also becomes a rectangular wave. Therefore, when a radially anisotropic permanent magnet is used, the harmonic component of the magnetic flux density in the air gap is large, the efficiency of the motor remains at a low value, and the noise of the motor is high.
【００１５】[0015]
【発明の実施の形態】本発明の請求項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回転し、回転子
鉄心の外周に等方性のリング状の永久磁石を配置し、回
転子鉄心内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、前記導体バーの両端を短絡環で短絡し
て形成した始動用かご形導体を有する回転子とからなる
電動機であって、前記永久磁石の同一極内の磁化方向が
回転子の軸に垂直な断面において極の中心と回転子の軸
の中心を結ぶ線に全て平行となる２極の回転子磁極を有
することにより、回転子の表面における径方向の磁束密
度が正弦波で分布するため、空隙部の磁束密度分布は正
弦波となる。このことにより空隙部の磁束密度分布の高
調波成分は無く鉄損を低減することができるため、高効
率で低騒音の２極の自己始動形永久磁石式同期電動機が
得られるという作用を有する。DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention is directed to a stator in which a winding is wound around a stator core, and a stator which is rotatably rotatably opposed to an inner cylindrical surface of the stator core. An isotropic ring-shaped permanent magnet is arranged on the outer periphery of the rotor core, and conductor bars are arranged in a plurality of slots provided near the outer periphery of the rotor core, and both ends of the conductor bar are short-circuited. A rotor having a starting cage conductor formed by short-circuiting with a ring, wherein the permanent magnet is magnetized in the same pole in a cross section perpendicular to the rotor axis and the center of the pole and the rotor. Since the magnetic flux density in the radial direction on the surface of the rotor is distributed as a sine wave by having two rotor magnetic poles that are all parallel to the line connecting the centers of the Becomes As a result, since there is no harmonic component in the magnetic flux density distribution in the air gap and iron loss can be reduced, there is an effect that a highly efficient, low-noise, 2-pole self-starting permanent magnet type synchronous motor can be obtained.
【００１６】また請求項２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回転する回転子とからなる電動
機であって、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、前記導体バーの両端を短絡
環で短絡して始動用かご形導体を形成するとともに、前
記回転子鉄心の外周にリング状の等方性の永久磁石を装
着してなる回転子に、前記回転子の軸に垂直な方向に平
行磁場をかけて着磁することを特徴とする２極の自己始
動形永久磁石式同期電動機の製造方法としたので、永久
磁石の着磁はどの方向に磁場をかけても自在に２極の回
転子磁極を形成することができるため、回転子鉄心の径
方向位置と永久磁石の磁極との位置を合わせながら組み
立てる必要がなく、組み立て作業が容易になるという作
用を有する。According to a second aspect of the present invention, there is provided an electric motor comprising a stator having a winding wound around a stator core, and a rotor rotatably rotatably opposed to an inner cylindrical surface of the stator core. A conductor bar is provided in a plurality of slots provided near the outer periphery of a rotor core, and both ends of the conductor bar are short-circuited by short-circuit rings to form a starting cage conductor, and the rotor A two-pole self-starting method comprising: applying a parallel magnetic field in a direction perpendicular to an axis of the rotor to a rotor having a ring-shaped isotropic permanent magnet mounted on an outer periphery of an iron core to magnetize the rotor. The method of manufacturing a permanent magnet type synchronous motor employs a method of manufacturing a permanent magnet. Therefore, the permanent magnet can be magnetized freely in any direction by applying a magnetic field. No need to assemble while aligning the position with the magnetic pole of the permanent magnet It has the effect of assembly work becomes easy.
【００１７】また請求項３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回転する回転子とからなる電動
機であって、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、前記導体バーの両端を短絡
環で短絡して始動用かご形導体を形成した前記回転子鉄
心の外周に、ラジアル方向に平行磁場をかけて着磁した
等方性のリング状の永久磁石を装着してなる回転子を構
成することを特徴とする２極の自己始動形永久磁石式同
期電動機の製造方法としたので、永久磁石だけで着磁で
きるため着磁工程の生産性を高めることができるという
作用を有する。According to a third aspect of the present invention, there is provided an electric motor comprising a stator having a winding wound around a stator core, and a rotor rotatably rotatably opposed to the inner cylindrical surface of the stator core. Wherein a conductor bar is provided in a plurality of slots provided near the outer periphery of the rotor core, and both ends of the conductor bar are short-circuited with a short-circuit ring to form a starting cage conductor. A two-pole self-starting permanent magnet synchronous motor, comprising: a rotor having an isotropic ring-shaped permanent magnet magnetized by applying a parallel magnetic field in a radial direction to an outer periphery thereof. Since the manufacturing method is adopted, the magnetizing can be performed only with the permanent magnet, so that the productivity of the magnetizing step can be improved.
【００１８】また請求項４に記載の発明は、永久磁石が
希土類磁石で形成したので、強い磁力が得られるため回
転子や電動機全体を小型軽量化することができるという
作用を有する。Further, since the permanent magnet is made of a rare earth magnet, a strong magnetic force can be obtained, so that the rotor and the motor as a whole can be reduced in size and weight.
【００１９】[0019]
【実施例】以下、本発明による自己始動形永久磁石式同
期電動機の実施例について、図面を参照しながら説明す
る。なお、従来と同一の構成については同一の符号を付
して詳細な説明は省略する。また固定子は一般的な自己
始動形永久磁石式同期電動機と同様の構成であるため固
定子についての説明も省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a self-starting permanent magnet synchronous motor according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and the detailed description is omitted. Since the stator has the same configuration as a general self-starting permanent magnet type synchronous motor, description of the stator is omitted.
【００２０】（実施例１）図１を用いて説明する。図１
は本発明の実施例１による自己始動形永久磁石式同期電
動機の回転子の縦断面図を示す。図１において、１は回
転子、２は回転子鉄心である。回転子鉄心２の外周に等
方性のリング状の永久磁石６を配置している。回転子鉄
心２の外周付近に複数個の導体バー４を配設するための
スロット３を設け、アルミダイカストにより前記導体バ
ー４と回転子鉄心の軸方向の両端の短絡環（図示せず）
を一体成型して始動用かご形導体を形成している。(Embodiment 1) A description will be given with reference to FIG. FIG.
1 is a longitudinal sectional view of a rotor of a self-starting permanent magnet type synchronous motor according to Embodiment 1 of the present invention. In FIG. 1, 1 is a rotor, and 2 is a rotor core. An isotropic ring-shaped permanent magnet 6 is arranged on the outer periphery of the rotor core 2. Slots 3 for disposing a plurality of conductor bars 4 are provided in the vicinity of the outer periphery of the rotor core 2, and short-circuit rings (not shown) at both ends of the conductor bars 4 and the rotor core in the axial direction are formed by aluminum die casting.
Are integrally molded to form a starting cage conductor.
【００２１】ここで図１において平行磁場Ｈで着磁する
ことにより、等方性のリング状の永久磁石６の磁化方向
８が軸９の中心と極の中心１０を結ぶ線Ａ−Ａ’線に平
行である２極の回転子磁極を形成する。永久磁石６の磁
化方向８の磁束の大きさが一定となるように着磁される
ので、回転子の表面での径方向の磁束密度の分布は正弦
波となるため、空隙部の磁束密度分布は図５のような正
弦波となる。このことにより空隙部の磁束密度分布の高
調波成分は無く鉄損を低減することができ、高い効率が
得られるとともに電動機の騒音を低減することができ
る。Here, in FIG. 1, by magnetizing with the parallel magnetic field H, the magnetization direction 8 of the isotropic ring-shaped permanent magnet 6 is a line AA 'connecting the center of the axis 9 and the center 10 of the pole. To form two rotor magnetic poles parallel to. Since the magnet is magnetized so that the magnitude of the magnetic flux in the magnetization direction 8 of the permanent magnet 6 is constant, the distribution of the magnetic flux density in the radial direction on the surface of the rotor is a sine wave, so that the magnetic flux density distribution in the air gap is provided. Is a sine wave as shown in FIG. As a result, there is no harmonic component in the magnetic flux density distribution in the air gap, so that iron loss can be reduced, high efficiency can be obtained, and noise of the motor can be reduced.
【００２２】（実施例２）上記実施例１で述べた２極の
自己始動形永久磁石式同期電動機の回転子の製造方法
は、回転子鉄心２にアルミダイカストで始動用かご形導
体を形成した前記回転子の外周に、等方性のリング状の
永久磁石を装着した回転子１に軸に垂直な方向に平行磁
場をかけて２極の回転子磁極を形成する工法であるた
め、永久磁石の着磁はどの方向に磁場をかけても自在に
２極の回転子磁極を形成することができるため、回転子
鉄心の径方向の位置と永久磁石の磁極の位置合わせをし
ながら組み立てをする必要がなく、組み立て作業を容易
に行うことができる。(Embodiment 2) In the method of manufacturing a rotor of a two-pole self-starting type permanent magnet synchronous motor described in Embodiment 1 above, a starting cage conductor is formed on a rotor core 2 by aluminum die casting. A method of forming a two-pole rotor magnetic pole by applying a parallel magnetic field in a direction perpendicular to the axis to a rotor 1 having an isotropic ring-shaped permanent magnet mounted on the outer periphery of the rotor. Can be formed freely by applying a magnetic field in any direction, so assemble while aligning the radial position of the rotor core with the magnetic pole of the permanent magnet. There is no necessity, and the assembling work can be easily performed.
【００２３】また先に等方性のリング状の永久磁石に、
径方向の平行磁場をかけて２極に着磁した後、アルミダ
イカストで始動用かご形導体を形成した回転子鉄心の外
周に装着する工法も考えられ、この場合は永久磁石のみ
の着磁であるから着磁工程の生産性を高めることができ
る。First, the isotropic ring-shaped permanent magnet is
It is also conceivable to use a method in which the magnet is magnetized to two poles by applying a parallel magnetic field in the radial direction, and then mounted on the outer periphery of the rotor core formed with a starting cage conductor by aluminum die casting. As a result, the productivity of the magnetization step can be increased.
【００２４】両者の中、どちらを選択するかは設備・工
法等総合的な面から決めて行けばよい。Which of the two is to be selected may be determined from a comprehensive aspect such as equipment and method of construction.
【００２５】（実施例３）図示はしないが、永久磁石を
希土類磁石で形成すれば、強い磁力が得られるので回転
子や電動機全体を小型軽量化することができる。(Embodiment 3) Although not shown, if the permanent magnet is formed of a rare earth magnet, a strong magnetic force can be obtained, so that the rotor and the motor can be reduced in size and weight.
【００２６】[0026]
【発明の効果】以上のように請求項１に記載の発明によ
れば、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回転し、回転
子鉄心の外周に等方性のリング状の永久磁石を配置し、
回転子鉄心内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、前記導体バーの両端を短絡環で短絡
して形成した始動用かご形導体を有する回転子とからな
る電動機であって、前記永久磁石の同一極内の磁化方向
が回転子の軸に垂直な断面において極の中心と回転子の
軸の中心を結ぶ線に全て平行となる２極の回転子磁極を
有することにより、空隙部の磁束密度分布は正弦波とな
る。このことにより空隙部の磁束密度分布の高調波成分
が無くなって鉄損を低減することができ、高い効率が得
られるとともに低騒音の２極の自己始動形永久磁石式同
期電動機を実現することができる。As described above, according to the first aspect of the present invention, the stator in which the winding is wound around the stator core, and the stator core is rotatably rotated facing the inner cylindrical surface of the stator core. Then, place an isotropic ring-shaped permanent magnet around the rotor core,
An electric motor comprising a rotor having a starting cage-shaped conductor formed by disposing conductor bars in a plurality of slots provided near the outer periphery in a rotor core and short-circuiting both ends of the conductor bar with a short-circuit ring; Wherein the permanent magnet has two rotor magnetic poles whose magnetization directions within the same pole are all parallel to a line connecting the center of the pole and the center of the rotor axis in a cross section perpendicular to the rotor axis. Accordingly, the magnetic flux density distribution in the gap becomes a sine wave. This eliminates the harmonic components of the magnetic flux density distribution in the air gap, thereby reducing iron loss, achieving high efficiency and realizing a low-noise, 2-pole self-starting permanent magnet synchronous motor. it can.
【００２７】また請求項２に記載の発明によれば、回転
子鉄心に永久磁石を装着した後着磁する工法としたもの
であるので、回転子鉄心の径方向の位置を永久磁石の磁
極との位置合わせをしながら組み立てをする必要がな
く、組み立て作業を容易に行うことができる。According to the second aspect of the present invention, the permanent magnet is mounted on the rotor core and then magnetized. Therefore, the radial position of the rotor core is set to the magnetic pole of the permanent magnet. It is not necessary to assemble while adjusting the positions of the components, and the assembling work can be easily performed.
【００２８】また請求項３に記載の発明によれば、先に
着磁した永久磁石を回転子鉄心に装着する工法としたも
のであり、永久磁石のみの着磁となるため着磁工程の生
産性を高めることができる。According to the third aspect of the present invention, a method is provided in which a permanent magnet previously magnetized is mounted on a rotor iron core. Since only the permanent magnet is magnetized, the production of the magnetizing step is performed. Can be enhanced.
【００２９】また請求項４に記載の発明によれば、永久
磁石を希土類磁石で形成したので、強い磁力が得られる
ため回転子や電動機全体を小型軽量化することができ
る。According to the fourth aspect of the present invention, since the permanent magnet is formed of a rare earth magnet, a strong magnetic force can be obtained, so that the size of the rotor and the entire motor can be reduced.
【図１】本発明の一実施の形態による回転子の縦断面図FIG. 1 is a longitudinal sectional view of a rotor according to an embodiment of the present invention.
【図２】従来の自己始動形永久磁石式同期電動機の回転
子の縦断面図FIG. 2 is a longitudinal sectional view of a rotor of a conventional self-starting permanent magnet synchronous motor.
【図３】従来例の空隙部の磁束密度分布図FIG. 3 is a diagram showing a magnetic flux density distribution in a gap portion according to a conventional example.
【図４】回転子の表面の磁束を示す図FIG. 4 is a view showing a magnetic flux on a surface of a rotor.
【図５】空隙部の磁束密度分布図FIG. 5 is a diagram showing a magnetic flux density distribution in a gap portion.
１ 回転子 ２ 回転子鉄心 ３ スロット ４ 導体バー ６ 永久磁石 ９ 軸 １０ 極の中心 DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor core 3 Slot 4 Conductor bar 6 Permanent magnet 9 Axis 10 Center of pole
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H621 AA01 AA03 GA01 GA04 HH01 HH03 HH10 JK02 5H622 AA01 CA01 CA02 CA05 CA12 DD02 PP03 PP10 PP11 PP20 QA04 QB04 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H621 AA01 AA03 GA01 GA04 HH01 HH03 HH10 JK02 5H622 AA01 CA01 CA02 CA05 CA12 DD02 PP03 PP10 PP11 PP20 QA04 QB04
Claims (4)
前記固定子鉄心の内径円筒面に対向して回転自在に回転
し、回転子鉄心の外周に等方性のリング状の永久磁石を
配置し、回転子鉄心内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、前記導体バーの両端を短絡
環で短絡して形成した始動用かご形導体を有する回転子
とからなる電動機であって、前記永久磁石の同一極内の
磁化方向が回転子の軸に垂直な断面において極の中心と
回転子の軸の中心を結ぶ線に全て平行となる２極の回転
子磁極を有することを特徴とする自己始動形永久磁石式
同期電動機。A stator having a winding wound around a stator core;
The stator core is rotatably rotated in opposition to the inner cylindrical surface of the stator core, an isotropic ring-shaped permanent magnet is arranged on the outer periphery of the rotor core, and a plurality of magnets are provided near the outer periphery in the rotor core. A rotor having a starting cage conductor formed by arranging a conductor bar in a slot and short-circuiting both ends of the conductor bar with a short-circuit ring, wherein the permanent magnet is magnetized in the same pole. A self-starting permanent magnet synchronous motor having two rotor magnetic poles, all of which are parallel to a line connecting the center of the pole and the center of the rotor axis in a cross section perpendicular to the rotor axis; .
前記固定子鉄心の内径円筒面に対向して回転自在に回転
する回転子とからなる電動機であって、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、
前記導体バーの両端を短絡環で短絡して始動用かご形導
体を形成するとともに、前記回転子鉄心の外周に等方性
のリング状の永久磁石を装着してなる回転子に、前記回
転子の軸に垂直な方向に平行磁場をかけて着磁すること
を特徴とする２極の自己始動形永久磁石式同期電動機の
製造方法。2. A stator having windings wound around a stator core,
A rotor rotatably rotatably opposed to the inner diameter cylindrical surface of the stator core, wherein a conductor bar is disposed in a plurality of slots provided near the outer periphery of the rotor core,
The rotor is formed by short-circuiting both ends of the conductor bar with a short-circuit ring to form a starting cage conductor, and a rotor having an isotropic ring-shaped permanent magnet mounted on the outer periphery of the rotor core. And magnetizing by applying a parallel magnetic field in a direction perpendicular to the axis of the permanent magnet type.
前記固定子鉄心の内径円筒面に対向して回転自在に回転
する回転子とからなる電動機であって、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、
前記導体バーの両端を短絡環で短絡して始動用かご形導
体を形成した前記回転子鉄心の外周に、径方向に平行磁
場をかけて着磁した等方性のリング状の永久磁石を装着
して回転子を構成することを特徴とする２極の自己始動
形永久磁石式同期電動機の製造方法。3. A stator having windings wound around a stator core,
A rotor rotatably rotatably opposed to the inner diameter cylindrical surface of the stator core, wherein a conductor bar is disposed in a plurality of slots provided near the outer periphery of the rotor core,
An isotropic ring-shaped permanent magnet, magnetized by applying a parallel magnetic field in the radial direction, is mounted on the outer periphery of the rotor core, in which both ends of the conductor bar are short-circuited with a short-circuit ring to form a starting cage conductor. A method for manufacturing a two-pole self-starting permanent magnet type synchronous motor, comprising:
特徴とする請求項１から請求項３に記載の２極の自己始
動形永久磁石式同期電動機とその製造方法。4. The two-pole self-starting permanent magnet synchronous motor according to claim 1, wherein the permanent magnet is made of a rare earth magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25703399A JP2001086718A (en) | 1999-09-10 | 1999-09-10 | Self-start type permanent-magnet synchronous motor and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25703399A JP2001086718A (en) | 1999-09-10 | 1999-09-10 | Self-start type permanent-magnet synchronous motor and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001086718A true JP2001086718A (en) | 2001-03-30 |
Family
ID=17300819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25703399A Pending JP2001086718A (en) | 1999-09-10 | 1999-09-10 | Self-start type permanent-magnet synchronous motor and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001086718A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005117771A (en) * | 2003-10-07 | 2005-04-28 | Hitachi Ltd | Permanent magnet type synchronous motor and compressor using it |
| US7161270B2 (en) | 2003-10-14 | 2007-01-09 | Lg Electronics Inc. | Line start reluctance synchronous motor |
| JP2007181305A (en) * | 2005-12-28 | 2007-07-12 | Hitachi Ltd | Permanent magnet type synchronous motor and compressor using the same |
| CN109842233A (en) * | 2019-02-25 | 2019-06-04 | 武汉万至达智能科技有限公司 | A kind of high steady high efficient three-phase high-speed motor |
-
1999
- 1999-09-10 JP JP25703399A patent/JP2001086718A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005117771A (en) * | 2003-10-07 | 2005-04-28 | Hitachi Ltd | Permanent magnet type synchronous motor and compressor using it |
| US7161270B2 (en) | 2003-10-14 | 2007-01-09 | Lg Electronics Inc. | Line start reluctance synchronous motor |
| CN1324791C (en) * | 2003-10-14 | 2007-07-04 | Lg电子株式会社 | Line start reluctance synchronous motor |
| JP2007181305A (en) * | 2005-12-28 | 2007-07-12 | Hitachi Ltd | Permanent magnet type synchronous motor and compressor using the same |
| CN109842233A (en) * | 2019-02-25 | 2019-06-04 | 武汉万至达智能科技有限公司 | A kind of high steady high efficient three-phase high-speed motor |
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