JP4712026B2 - Permanent magnet type motor and compressor - Google Patents

Permanent magnet type motor and compressor Download PDF

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JP4712026B2
JP4712026B2 JP2007340332A JP2007340332A JP4712026B2 JP 4712026 B2 JP4712026 B2 JP 4712026B2 JP 2007340332 A JP2007340332 A JP 2007340332A JP 2007340332 A JP2007340332 A JP 2007340332A JP 4712026 B2 JP4712026 B2 JP 4712026B2
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permanent magnet
rotor core
rotor
core portion
density member
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JP2008167649A (en
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和彦 馬場
仁 川口
智明 及川
庸賀 田島
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Description

この発明は、冷蔵庫、除湿機、エアコンなどの圧縮機に用いられる永久磁石型モータ及びこれを用いた圧縮機に関するものである。   The present invention relates to a permanent magnet type motor used in a compressor such as a refrigerator, a dehumidifier, and an air conditioner, and a compressor using the same.

近年、エアコンや冷蔵庫用の圧縮機駆動用のモータなどでは、回転数の制御が容易で、モータ効率の良い永久磁石型モータが使用されている。
永久磁石型モータは圧縮機運転中の振動、運転騒音を防止するために例えば次のようになされていた。
シャフトの出力軸端のアンバランスを修正するために、ロータの両側にバランスウエイトを設け、ロータコアの軸方向長さをステータコアの軸方向長さよりも大きくし、かつ、ロータコアの軸方向中心を、ステータの軸方向中心よりも反出力側にずらす。（例えば、特許文献１参照。）。 In recent years, motors for driving compressors for air conditioners and refrigerators have used permanent magnet motors that can easily control the number of rotations and have high motor efficiency.
For example, the permanent magnet type motor has been implemented as follows in order to prevent vibration and noise during operation of the compressor.
In order to correct the unbalance of the output shaft end of the shaft, balance weights are provided on both sides of the rotor, the axial length of the rotor core is made larger than the axial length of the stator core, and the axial center of the rotor core is Shift to the non-output side from the axial center. (For example, refer to Patent Document 1).

特開２０００−１３４８８２号公報（第５頁、第６頁、図３）JP 2000-134882 (5th page, 6th page, FIG. 3)

以上の様に、従来の圧縮機駆動用の永久磁石型モータは、ロータ鉄心部の軸方向長さをステータ鉄心部の軸方向長さより大きくなるように構成していたため、永久磁石をロータ鉄心部の内部に埋め込んで構成した磁石埋め込み型ロータを用いた場合、永久磁石の作る磁束が、ロータ鉄心部の軸方向の端部において、磁石極間外周部の薄肉連結部を通って隣の磁極の永久磁石へ戻る経路の短絡磁束（Φ１）が発生し、トルクに寄与する有効な磁束が減少し、所望のトルクを得るための電流が増大し、銅損を増大させていた（課題Ａ）。   As described above, the conventional permanent magnet type motor for driving the compressor is configured such that the axial length of the rotor core portion is larger than the axial length of the stator core portion. When the embedded magnet rotor is used, the magnetic flux produced by the permanent magnet is passed through the thin connecting portion of the outer periphery between the magnet poles at the end of the rotor core in the axial direction. The short-circuit magnetic flux (Φ1) on the path to the permanent magnet is generated, the effective magnetic flux contributing to the torque is reduced, the current for obtaining the desired torque is increased, and the copper loss is increased (Problem A).

また、ステータ巻線に流れる電流によって作られる磁束が、ロータ鉄心部の軸方向の外周端部を通る経路の漏れ磁路が発生することにより、所望のトルクを得るためにより多くの電流が必要となり、銅損を増大させていた（課題Ｂ）。   In addition, the magnetic flux generated by the current flowing through the stator windings generates a leakage magnetic path that passes through the outer peripheral end in the axial direction of the rotor core, so that more current is required to obtain the desired torque. The copper loss was increased (Problem B).

さらに、ステータ巻線のコイルエンド部とロータ鉄心部が対向して配置されており、ステータ巻線に流れる電流によって作られる磁束（Φ２）がロータ鉄心部の端部に対して垂直に変化するため、ステータ巻線のコイルエンド部と対向するロータ鉄心部の端部に渦電流損失が発生し、鉄損を増大させていた（課題Ｃ）。   Furthermore, since the coil end portion of the stator winding and the rotor core portion are arranged to face each other, the magnetic flux (Φ2) generated by the current flowing in the stator winding changes perpendicularly to the end portion of the rotor core portion. An eddy current loss occurs at the end of the rotor core that faces the coil end of the stator winding, increasing the iron loss (Problem C).

また、前記の課題Ｃに対して、ステータ巻線のコイルエンド部と対向するロータ鉄心部の端部の材質を非磁性の金属材料で構成しても、非磁性の金属材料内に渦電流が発生し、鉄損を増大させていた。   Further, even if the material of the end portion of the rotor core portion facing the coil end portion of the stator winding is made of a nonmagnetic metal material, the eddy current is generated in the nonmagnetic metal material. Generated and increased iron loss.

また、ステータ巻線のコイルエンド部と対向するロータ鉄心部の端部の材質を非磁性の樹脂で形成した場合は、十分なモーメントを得るのにバランスウェイトの高さが大きくなり、圧縮機が大きくなっていた。   Also, if the material of the end of the rotor core facing the coil end of the stator winding is made of non-magnetic resin, the balance weight will be high to obtain a sufficient moment, and the compressor will It was getting bigger.

以上のように、従来の永久磁石型モータが振動・騒音の抑制はできたとしても、同時に銅損及び鉄損の発生により、効率の低下を伴っていたのを解決するためになされたもので、本発明は、永久磁石型モータの効率低下を抑え、かつ、振動・騒音を抑制することを目的とする。また、この永久磁石型モータを使用することにより、高効率で振動・騒音の低い圧縮機を得ることを目的とする。   As described above, even if the conventional permanent magnet type motor can suppress the vibration and noise, it was made to solve the problem that the copper loss and the iron loss caused the decrease in efficiency at the same time. An object of the present invention is to suppress a decrease in efficiency of a permanent magnet motor and to suppress vibration and noise. Another object of the present invention is to obtain a compressor with high efficiency and low vibration and noise by using this permanent magnet type motor.

本発明に係る永久磁石型モータは、駆動軸と、希土類磁石からなる永久磁石が挿入され、中心を貫通する駆動軸に固定されて一体に回転するロータ鉄心部を有するロータと、ロータ鉄心部の外周部から所定の間隙を設けてロータ鉄心部を囲むように形成されたステータ鉄心部を有し、巻線が施されたステータとを備えた永久磁石型モータにおいて、ロータ鉄心部の軸方向の端部にロータの慣性力を増加させる高密度部材からなる筒体状の高密度部材部を設け、該高密度部材部の外径寸法をロータ鉄心部の外径寸法より小さくし、ロータを含む高密度部材部の軸方向と平行な方向の長さは、ステータ鉄心部の軸方向と平行な方向の長さに対して、２〜３倍であるものである。
また、この発明に係る圧縮機は、上記の永久磁石型モータを用いたものである。 A permanent magnet motor according to the present invention includes a drive shaft, a rotor having a permanent magnet made of a rare-earth magnet inserted therein, a rotor core portion fixed to the drive shaft passing through the center and rotating integrally, and a rotor core portion In a permanent magnet type motor having a stator core portion formed so as to surround the rotor core portion by providing a predetermined gap from the outer peripheral portion, and having a stator with windings, the axial direction of the rotor core portion A cylindrical high-density member portion made of a high-density member that increases the inertial force of the rotor is provided at the end, and the outer diameter size of the high-density member portion is made smaller than the outer diameter size of the rotor core portion, and the rotor is included. The length of the high-density member portion in the direction parallel to the axial direction is 2 to 3 times the length of the stator core portion in the direction parallel to the axial direction .
The compressor according to the present invention uses the above-described permanent magnet type motor.

本発明に係る永久磁石型モータによれば、駆動軸と、希土類磁石からなる永久磁石が挿入され、中心を貫通する駆動軸に固定されて一体に回転するロータ鉄心部を有するロータと、ロータ鉄心部の外周部から所定の間隙を設けてロータ鉄心部を囲むように形成されたステータ鉄心部を有し、巻線が施されたステータとを備えた永久磁石型モータにおいて、ロータ鉄心部の軸方向の端部にロータの慣性力を増加させる高密度部材からなる筒体状の高密度部材部を設け、該高密度部材部の外径寸法をロータ鉄心部の外径寸法より小さくし、ロータを含む高密度部材部の軸方向と平行な方向の長さは、ステータ鉄心部の軸方向と平行な方向の長さに対して、２〜３倍であるので、ロータの慣性力を増大させることができ、高効率で低騒音にすることができる。
また、この発明の圧縮機によれば、上記の永久磁石型モータを用いることにより、圧縮機構部の吸入、圧縮、吐出工程の中で発生していた圧力変動に伴うロータの速度変動を緩和し、振動を低減でき、密閉容器や吐出管、吸入管を伝わって発生していた騒音を抑制でき、高効率で、振動・騒音を低減することができる。 According to the permanent magnet type motor according to the present invention, a rotor having a rotor core having a drive shaft, a permanent magnet made of a rare earth magnet inserted therein, fixed to the drive shaft passing through the center and rotating integrally, and the rotor core In a permanent magnet type motor having a stator core portion that is formed so as to surround the rotor core portion with a predetermined gap from the outer peripheral portion of the portion, and a stator with a winding, the shaft of the rotor core portion A cylindrical high-density member portion made of a high-density member that increases the inertial force of the rotor is provided at the end in the direction, and the outer diameter size of the high-density member portion is made smaller than the outer diameter size of the rotor core portion; The length in the direction parallel to the axial direction of the high-density member portion including 2 to 3 times the length in the direction parallel to the axial direction of the stator core portion increases the inertial force of the rotor. Can be high efficiency and low noise It can be.
Further, according to the compressor of the present invention, by using the above permanent magnet type motor, the speed fluctuation of the rotor due to the pressure fluctuation generated during the suction, compression, and discharge processes of the compression mechanism is reduced. The vibration can be reduced, the noise generated through the sealed container, the discharge pipe and the suction pipe can be suppressed, and the vibration and noise can be reduced with high efficiency.

実施の形態１．
図１は、この発明の実施の形態１を示す圧縮機駆動用の永久磁石型モータを組み込んだ圧縮機の縦断面図であり、図２は、同じく永久磁石型モータのロータの横断面図であり、図３は、同じく圧縮機の圧縮機構部を示す図である。
これらの図において、圧縮機は、密閉容器７内の上部にステータ５とロータ６からなる永久磁石型モータを配置し、下部に圧縮機構部１５を配置し、両者を駆動軸１３で連結し、永久磁石型モータにより駆動軸１３を回転し、圧縮機構部１５を働かせ、吸入冷媒を圧縮する。 Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a compressor incorporating a permanent magnet type motor for driving a compressor according to Embodiment 1 of the present invention. FIG. 2 is a transverse sectional view of a rotor of the permanent magnet type motor. FIG. 3 is a view showing the compression mechanism of the compressor.
In these drawings, the compressor has a permanent magnet type motor composed of a stator 5 and a rotor 6 arranged in the upper part of the hermetic container 7, a compression mechanism part 15 arranged in the lower part, and both are connected by a drive shaft 13, The drive shaft 13 is rotated by a permanent magnet type motor, the compression mechanism unit 15 is operated, and the sucked refrigerant is compressed.

永久磁石型モータのステータ５は、中心部が開口した厚さ０．３〜０．５ｍｍ程度の円板状の電磁鋼板を複数枚軸方向に積層した中空積層体であるステータ鉄心部５ａとその上下両端のコイルエンド部５ｂからなり、ステータ鉄心部５ａは中心に配置されたロータ６を空隙部１２を隔てて囲うように配置され、また、外周側を焼嵌めまたは、溶接等の手段により密閉容器７に直接取り付け、保持される。ステータ５のステータ鉄心部５ａには、複数のスロット（図示せず）が設けられ、このスロット内にコイルが巻回され、分布巻線または集中巻線などの巻線１１が施される。   The stator 5 of the permanent magnet type motor includes a stator core portion 5a which is a hollow laminated body in which a plurality of disk-shaped electromagnetic steel plates having a thickness of about 0.3 to 0.5 mm with an opening at the center are laminated in the axial direction, and the stator core portion 5a. Consists of upper and lower coil end portions 5b, and the stator core portion 5a is disposed so as to surround the rotor 6 disposed in the center with the gap 12 therebetween, and the outer peripheral side is sealed by means such as shrink fitting or welding. Attached directly to the container 7 and held. The stator core portion 5a of the stator 5 is provided with a plurality of slots (not shown), in which coils are wound and windings 11 such as distributed windings or concentrated windings are applied.

ロータ６は、中心を軸方向に貫通する駆動軸１３に固定されたロータ鉄心部６ａとロータ鉄心部６ａの上端及び下端に取付けられ、同様に中心を軸方向に貫通する駆動軸１３に固定された高密度部材からなる高密度部材部６ｂより形成される。
ロータ鉄心部６ａは、中心部が開口した厚さ０．３〜０．５ｍｍ程度の円板状の電磁鋼板を複数枚軸方向に積層し、一体化したものである。このロータ鉄心部６ａには、駆動軸１３直交面において、駆動軸１３を中心にして、軸方向に複数の磁石挿入孔９が設けられ、永久磁石１０がロータ鉄心部６ａの軸方向全体にわたって挿入される。永久磁石１０としては、ネオジウム、鉄、ボロンなどを主成分とした焼結希土類磁石が用いられる。
ステータ鉄心部５ａとロータ鉄心部６ａとは、ロータ鉄心部６ａを中にして所定の空隙部１２を設けて、駆動軸１３方向に同心に形成される。 The rotor 6 is attached to the rotor core 6a fixed to the drive shaft 13 passing through the center in the axial direction and the upper and lower ends of the rotor core 6a, and similarly fixed to the drive shaft 13 passing through the center in the axial direction. The high-density member portion 6b made of a high-density member.
The rotor core portion 6a is formed by laminating a plurality of disc-shaped electromagnetic steel plates having a thickness of about 0.3 to 0.5 mm with an opening at the center in the axial direction. In the rotor core portion 6a, a plurality of magnet insertion holes 9 are provided in the axial direction about the drive shaft 13 on the plane orthogonal to the drive shaft 13, and the permanent magnet 10 is inserted over the entire axial direction of the rotor core portion 6a. Is done. As the permanent magnet 10, a sintered rare earth magnet mainly composed of neodymium, iron, boron or the like is used.
The stator core portion 5a and the rotor core portion 6a are formed concentrically in the direction of the drive shaft 13 by providing a predetermined gap portion 12 with the rotor core portion 6a in the middle.

ロータ鉄心部６ａの上端及び下端に取付けられる高密度部材部６ｂは、外径をロータ鉄心部６ａの外径より所定量小さくした中空円筒体である。また、高密度部材部６ｂは、非磁性金属製である。即ち、金属の非磁性体である真鍮（銅と亜鉛との合金）を用いている。この他に、銅、パラジウム、タングステン、塩化ニッケル、ステンレス等でもよく、高密度の非磁性材料であればよい。
ロータ鉄心部６ａ及び高密度部材部６ｂの中心を貫通し、固定する駆動軸１３の圧縮機構部１５側は、密閉容器７下部の軸受部１４、１４により回転自在に保持される。 The high-density member portion 6b attached to the upper end and the lower end of the rotor core portion 6a is a hollow cylindrical body having an outer diameter smaller than the outer diameter of the rotor core portion 6a by a predetermined amount. The high density member 6b is made of a nonmagnetic metal. That is, brass (alloy of copper and zinc), which is a metal nonmagnetic material, is used. In addition, copper, palladium, tungsten, nickel chloride, stainless steel, or the like may be used as long as it is a high-density nonmagnetic material.
The compression mechanism 15 side of the drive shaft 13 that passes through and is fixed to the center of the rotor core 6a and the high-density member 6b is rotatably held by bearings 14 and 14 below the hermetic container 7.

次に、図１に示すように、ステータ５とロータ６の寸法関係を説明する。
ロータ６のロータ鉄心部６ａの軸方向長さＬ１をステータ５のステータ鉄心部５ａの軸方向の長さＬ２と略同一とし、ロータ鉄心部６ａの両端部にロータ鉄心部６ａの外径Ｄ１よりも所定量小さい外径Ｄ２の高密度部材部６ｂを取り付け、かつ、ステータ鉄心部５ａの軸方向長さＬ２に対し、高密度部材部６ｂを含むロータ６の軸方向長さＬ３を所定量大きくなるように構成した。
例えば、高密度部材部６ｂの外径Ｄ２は、ロータ鉄心部６ａの外径Ｄ１に対し、およそ０．９５倍以下となるように構成している。即ち、この高密度部材部６ｂの外径寸法Ｄ２は、永久磁石型モータの駆動時にコイルエンド部５ｂから発する漏れ磁束Φ２が高密度部材部６ｂに鎖交して渦電流が流れない寸法まで高密度部材部６ｂの外径Ｄ２を小さくなるように構成している。 Next, as shown in FIG. 1, the dimensional relationship between the stator 5 and the rotor 6 will be described.
The axial length L1 of the rotor core portion 6a of the rotor 6 is made substantially the same as the axial length L2 of the stator core portion 5a of the stator 5, and the outer diameter D1 of the rotor core portion 6a is at both ends of the rotor core portion 6a. The high-density member portion 6b having an outer diameter D2 that is smaller by a predetermined amount is attached, and the axial length L3 of the rotor 6 including the high-density member portion 6b is larger by a predetermined amount than the axial length L2 of the stator core portion 5a. It comprised so that it might become.
For example, the outer diameter D2 of the high-density member 6b is configured to be approximately 0.95 times or less than the outer diameter D1 of the rotor core 6a. That is, the outer diameter D2 of the high density member 6b is high enough to prevent the leakage magnetic flux Φ2 generated from the coil end portion 5b from interlinking with the high density member 6b when the permanent magnet motor is driven, and causing no eddy current to flow. The outer diameter D2 of the density member portion 6b is configured to be small.

なお、ステータ鉄心部５ａの軸方向長さＬ２に対し、高密度部材部６ｂを含むロータ６の軸方向長さＬ３を所定量大きくなるようにすれば、高密度部材部６ｂは、ロータ鉄心部６ａの上端及び下端の両方に取付けなくても、どちらか一端に取付けてもよい。
さらに、ロータ６のロータ鉄心部６ａの軸方向長さＬ１をステータ５のステータ鉄心部５ａの軸方向の長さＬ２と略同一とせずに、ロータ鉄心部６ａの軸方向長さＬ１をステータ鉄心部５ａの軸方向の長さＬ２より長くしてもよい。
ステータ鉄心部５ａの軸方向の長さＬ２に対してロータ鉄心部６ａの軸方向長さＬ１を長くし、ロータ鉄心部６ａの軸方向長さＬ１と略同一長さの永久磁石１０を設けることによって、ロータ鉄心部６ａの外周部を通りステータ鉄心部５ａを鎖交する磁束を増加することができ、同一トルクを得るための電流を低減でき、銅損を低減できる。ロータ鉄心部６ａの軸方向長さＬ１を長くすればするほど磁力が大きくなる訳ではなく、ある長さ以上では磁束はそれ以上増加しない。即ち、長さＬ１を長さＬ２の１．４倍以下とするのが望ましい。 If the axial length L3 of the rotor 6 including the high-density member portion 6b is increased by a predetermined amount with respect to the axial length L2 of the stator core portion 5a, the high-density member portion 6b becomes the rotor core portion. It does not need to be attached to both the upper end and the lower end of 6a, and may be attached to either one end.
Further, the axial length L1 of the rotor core portion 6a of the rotor 6 is not substantially the same as the axial length L2 of the stator core portion 5a of the stator 5, and the axial length L1 of the rotor core portion 6a is set to the stator core. You may make it longer than the length L2 of the axial direction of the part 5a.
The axial length L1 of the rotor core portion 6a is made longer than the axial length L2 of the stator core portion 5a, and the permanent magnet 10 having substantially the same length as the axial length L1 of the rotor core portion 6a is provided. Thus, the magnetic flux passing through the outer periphery of the rotor core portion 6a and interlinking with the stator core portion 5a can be increased, the current for obtaining the same torque can be reduced, and the copper loss can be reduced. The longer the axial length L1 of the rotor core portion 6a, the larger the magnetic force does not increase, and the magnetic flux does not increase beyond a certain length. That is, it is desirable that the length L1 is 1.4 times or less of the length L2.

また、高密度部材部６ｂを含むロータ６の軸方向長さＬ３は、ロータ６の永久磁石１０に希土類磁石を用いた場合、ステータ鉄心部５ａの軸方向長さＬ２のおよそ２〜３倍となるように構成されている。このロータ６の軸方向長さＬ３は、ロータ６にフェライト磁石を用いて構成した場合に同一効率を得るために必要なロータ鉄心幅と概略等しくなるように構成されている。即ち、希土類磁石を用いることによりフェライト磁石を用いた場合より、軸方向長さが小さくなるように設計されている。   Further, the axial length L3 of the rotor 6 including the high density member portion 6b is about 2 to 3 times the axial length L2 of the stator core portion 5a when a rare earth magnet is used as the permanent magnet 10 of the rotor 6. It is comprised so that it may become. The axial length L3 of the rotor 6 is configured to be approximately equal to the rotor core width required to obtain the same efficiency when the rotor 6 is configured using a ferrite magnet. That is, the axial length is designed to be smaller by using rare earth magnets than when using ferrite magnets.

また、圧縮機構部１５は、外周部が密閉容器７に直接取付けられ、固定される。この圧縮機構部１５は、図３で示すように吸入口１６及び吐出口１７が開口するシリンダ室を有するシリンダ１８と、駆動軸１３の偏心軸部に回転自在に嵌入され、シリンダ１８内に配置されたピストン１９と、該ピストン１９に一体的に設けられシリンダ室を吸入口１６に通じる圧縮室の低圧室２０と、吐出口１７に通じる圧縮室の高圧室２１とに区画するベーン２２によって構成されている。   Further, the outer peripheral portion of the compression mechanism portion 15 is directly attached to the sealed container 7 and fixed. As shown in FIG. 3, the compression mechanism portion 15 is rotatably fitted in a cylinder 18 having a cylinder chamber in which a suction port 16 and a discharge port 17 are opened, and an eccentric shaft portion of the drive shaft 13, and is disposed in the cylinder 18. And a vane 22 that is provided integrally with the piston 19 and is divided into a low pressure chamber 20 of a compression chamber that communicates the cylinder chamber with the suction port 16 and a high pressure chamber 21 of the compression chamber that communicates with the discharge port 17. Has been.

インバータによって永久磁石型モータの駆動軸１３が回転駆動されると、これに連動してピストン１９が回転し、吸入口１６よりシリンダ室内に冷媒ガスが吸入され、圧縮され吐出口１７より吐出する。この際、永久磁石型モータの駆動軸１３は、図４に示すように１回転中に大きな圧力変動（駆動トルク変動）が伴うことになる。   When the drive shaft 13 of the permanent magnet type motor is driven to rotate by the inverter, the piston 19 rotates in conjunction with this, and the refrigerant gas is sucked into the cylinder chamber from the suction port 16 and compressed and discharged from the discharge port 17. At this time, the drive shaft 13 of the permanent magnet type motor is accompanied by a large pressure fluctuation (drive torque fluctuation) during one rotation as shown in FIG.

図５に、本モータをインバータを用いて１２０度矩形波駆動によって駆動した場合の電流波形を示す。図５（ａ）は、高密度部材部６ｂを取り付けない場合であり、図５（ｂ）は、高密度部材部６ｂを取り付けた場合のモータ電流波形を示している。
両図の比較に示すように、高密度部材部６ｂを取り付けない状態では、１回転中に大きな電流脈動を発生していたのに対し、上記のような高密度部材部６ｂを取り付けることによって１回転中の電流脈動を低減し電流を均一化することができる。
即ち、ロータ鉄心部６ａの軸方向長さＬ１をステータ鉄心部５ａの軸方向の長さＬ２と略同一とし、ロータ鉄心部６ａの両端部に金属の非磁性体からなる高密度部材部６ｂを設けたことにより、ロータ６の慣性力を増大させることができ、モータの振動・騒音を抑制できる。
なお、ステータ鉄心部５ａの軸方向の長さＬ２に対してロータ鉄心部６ａの軸方向長さＬ１を長くし、ロータ鉄心部６ａの軸方向長さＬ１と略同一長さの永久磁石１０を設けるようにしても同様の効果が得られる。
また、高密度部材部６ｂは、非磁性金属製に限らず、高密度部材からなるものであれば同様にロータ６の慣性力を増大させることができる。
また、駆動方式は１２０度矩形波駆動に限られるものではなく、１２０度以上の矩形波駆動や正弦波駆動など、他の如何なる駆動方式であっても同様の効果が得られる。 FIG. 5 shows a current waveform when this motor is driven by a 120-degree rectangular wave drive using an inverter. FIG. 5A shows a case where the high-density member portion 6b is not attached, and FIG. 5B shows a motor current waveform when the high-density member portion 6b is attached.
As shown in the comparison between the two figures, a large current pulsation was generated during one rotation when the high-density member portion 6b was not attached, whereas by attaching the high-density member portion 6b as described above, 1 Current pulsation during rotation can be reduced and current can be made uniform.
That is, the axial length L1 of the rotor core portion 6a is substantially the same as the axial length L2 of the stator core portion 5a, and high-density member portions 6b made of a metal nonmagnetic material are provided at both ends of the rotor core portion 6a. By providing, the inertia force of the rotor 6 can be increased and the vibration and noise of the motor can be suppressed.
The axial length L1 of the rotor core 6a is made longer than the axial length L2 of the stator core 5a, and the permanent magnet 10 having substantially the same length as the axial length L1 of the rotor core 6a is provided. Even if it is provided, the same effect can be obtained.
Further, the high-density member portion 6b is not limited to a non-magnetic metal, and if it is made of a high-density member, the inertia force of the rotor 6 can be increased similarly.
Further, the driving method is not limited to the 120 ° rectangular wave driving, and the same effect can be obtained by any other driving method such as a rectangular wave driving of 120 ° or more and a sine wave driving.

また、ロータ鉄心部６ａとステータ鉄心部５ａ、それぞれの軸方向の長さを略同一とするか、または、略同一長さの永久磁石１０を設けるロータ鉄心部６ａの軸方向長さをステータ鉄心部５ａの軸方向の長さより長くし、ロータ鉄心部６ａの端部に設けた高密度部材部６ｂの材質を非磁性の金属で構成しているため、ロータ鉄心部６ａの内部に設けた永久磁石１０の発する磁束が高密度部材部６ｂを通って隣接の磁石極１０ａを流れる経路の漏れ磁束Φ１が発生せず、即ち、短絡磁束Φ１が発生せず、銅損を低減できる（即ち、課題Ａの解消ができる）。   Further, the axial lengths of the rotor core portion 6a and the stator core portion 5a are made substantially the same in the axial direction, or the axial length of the rotor core portion 6a provided with the permanent magnet 10 having the substantially same length is set as the stator core. Since the material of the high-density member portion 6b which is longer than the axial length of the portion 5a and is provided at the end of the rotor core portion 6a is made of nonmagnetic metal, the permanent portion provided inside the rotor core portion 6a. The leakage flux Φ1 of the path through which the magnetic flux generated by the magnet 10 passes through the adjacent magnet pole 10a through the high-density member portion 6b does not occur, that is, the short-circuit flux Φ1 does not occur, and the copper loss can be reduced (that is, the problem) A can be eliminated).

また、ロータ鉄心部６ａとステータ鉄心部５ａ、それぞれの軸方向の長さを略同一とするか、または、略同一長さの永久磁石１０を設けるロータ鉄心部６ａの軸方向長さをステータ鉄心部５ａの軸方向の長さより長くし、非磁性金属製の高密度部材部６ｂとロータ鉄心部６ａの外径寸法関係をＤ２＜Ｄ１とすることにより、即ち、高密度部材部６ｂの外径寸法Ｄ２を、ロータ鉄心部６ａの外径寸法Ｄ１よりも所定量小さくことにより、永久磁石型モータ駆動時にコイルエンド部５ｂから発する漏れ磁束Φ２が高密度部材部６ｂに鎖交して渦電流が流れないので、ステータ巻線１１によるロータ鉄心部６ａの渦電流損失が低減でき、鉄損を低減できる圧縮機モータを実現できる（即ち、課題Ｃの解消ができる）。
この際、高密度部材部６ｂは、非磁性金属製でなく、磁性金属製でもよい。
また、特に高密度部材部６ｂとロータ鉄心部６ａの外径寸法関係をＤ２＜Ｄ１としなくても、高密度部材部６ｂを、厚さの薄い非磁性金属板（例えば、薄い真鍮板）又は磁性金属板（例えば、薄い電磁鋼板）を絶縁皮膜を介して積層しても課題Ｃの解消ができる。 Further, the axial lengths of the rotor core portion 6a and the stator core portion 5a are made substantially the same in the axial direction, or the axial length of the rotor core portion 6a provided with the permanent magnet 10 having the substantially same length is set as the stator core. It is longer than the axial length of the portion 5a, and the outer diameter dimensional relationship between the non-magnetic metal high-density member portion 6b and the rotor core portion 6a is D2 <D1, that is, the outer diameter of the high-density member portion 6b. By making the dimension D2 smaller by a predetermined amount than the outer diameter dimension D1 of the rotor core 6a, the leakage magnetic flux Φ2 generated from the coil end 5b when the permanent magnet motor is driven is linked to the high-density member 6b and an eddy current is generated. Since it does not flow, the eddy current loss of the rotor core 6a due to the stator winding 11 can be reduced, and a compressor motor capable of reducing the iron loss can be realized (that is, the problem C can be solved).
At this time, the high density member portion 6b may be made of a magnetic metal instead of a nonmagnetic metal.
Further, even if the outer diameter dimensional relationship between the high-density member portion 6b and the rotor core portion 6a is not D2 <D1, the high-density member portion 6b is made of a thin nonmagnetic metal plate (for example, a thin brass plate) or Even if a magnetic metal plate (for example, a thin electromagnetic steel plate) is laminated through an insulating film, the problem C can be solved.

また、ロータ鉄心部６ａとステータ鉄心部５ａ、それぞれの軸方向の長さを略同一とするか、または、略同一長さの永久磁石１０を設けるロータ鉄心部６ａの軸方向長さをステータ鉄心部５ａの軸方向の長さより長くし、ロータ鉄心部６ａの両端部にロータ鉄心部６ａの外径Ｄ１よりも所定量小さい径Ｄ２の非磁性金属製の高密度部材部６ｂを取り付けたので、ステータ５の巻線１１に流れる電流によって作られる磁束が、ロータ鉄心部６ａの軸方向の外周端部を通る経路の漏れ磁路が発生することがなく、又は低減し銅損を低減できる（即ち、課題Ｂの解消ができる）。
この際、高密度部材部６ｂは、非磁性金属製でなく、磁性金属製でもよい。 Further, the axial lengths of the rotor core portion 6a and the stator core portion 5a are made substantially the same in the axial direction, or the axial length of the rotor core portion 6a provided with the permanent magnet 10 having the substantially same length is set as the stator core. Since the length in the axial direction of the portion 5a is longer and the non-magnetic metal high-density member portion 6b having a diameter D2 smaller than the outer diameter D1 of the rotor core portion 6a is attached to both ends of the rotor core portion 6a, The magnetic flux generated by the current flowing through the winding 11 of the stator 5 does not generate or reduces the leakage magnetic path of the path passing through the outer peripheral end in the axial direction of the rotor core 6a (that is, the copper loss can be reduced). Problem B can be solved).
At this time, the high density member portion 6b may be made of a magnetic metal instead of a nonmagnetic metal.

また、高密度部材部６ｂをロータ鉄心部６ａと同様に積層体とすることにより、即ち、厚さの薄い磁性金属板の積層体とすることにより、ロータ鉄心部６ａと同一の順送金型内で製造でき、製造工程が簡易化でき、製作が容易となる。   Further, by forming the high-density member portion 6b in the same manner as the rotor core portion 6a, that is, by forming a thin magnetic metal plate in the same progressive die as the rotor core portion 6a. The manufacturing process can be simplified, and the manufacturing becomes easy.

以上のように本実施の形態の永久磁石型モータによれば、ロータ鉄心部６ａの軸方向の端部に高密度部材からなる高密度部材部６ｂを設け、該高密度部材部６ｂの外径寸法をロータ鉄心部６ａの外径寸法より小さくしたので、ロータ６の慣性力を増大させることができ、かつ、ロータ鉄心部６ａの渦電流損失が低減でき、鉄損を低減でき、モータの効率向上及び振動・騒音を抑制できる。   As described above, according to the permanent magnet type motor of the present embodiment, the high-density member portion 6b made of a high-density member is provided at the axial end of the rotor core portion 6a, and the outer diameter of the high-density member portion 6b. Since the dimensions are smaller than the outer diameter of the rotor core 6a, the inertial force of the rotor 6 can be increased, the eddy current loss of the rotor core 6a can be reduced, the iron loss can be reduced, and the motor efficiency Improvement and suppression of vibration and noise.

また、ロータ鉄心部６ａの軸方向の端部に非磁性金属製の高密度部材部６ｂを設けたので、ロータ６の慣性力を増大させることができ、かつ、ロータ鉄心部６ａの内部を流れる漏れ磁束Φ１が発生せず、銅損を低減でき、モータの効率向上及び振動・騒音を抑制できる。   In addition, since the nonmagnetic metal high-density member 6b is provided at the axial end of the rotor core 6a, the inertial force of the rotor 6 can be increased, and the rotor core 6a flows inside the rotor core 6a. Leakage flux Φ1 is not generated, copper loss can be reduced, motor efficiency can be improved, and vibration and noise can be suppressed.

また、前記の高密度部材からなる高密度部材部６ｂ、又は磁性金属製の高密度部材部６ｂを、厚さの薄い磁性金属板の積層で形成したので、ロータ６の製造工程が簡易化でき、製作が容易となる。   Further, since the high-density member portion 6b made of the high-density member or the high-density member portion 6b made of magnetic metal is formed by laminating thin magnetic metal plates, the manufacturing process of the rotor 6 can be simplified. Manufacturing becomes easy.

また、高密度部材部６ｂを、厚さの薄い金属板を絶縁皮膜を介して積層して形成したので、ロータ６の慣性力を増大させることができ、かつ、ロータ鉄心部６ａの渦電流損失が低減でき、鉄損を低減でき、モータの効率向上及び振動・騒音を抑制できる。   Further, since the high-density member portion 6b is formed by laminating thin metal plates via an insulating film, the inertial force of the rotor 6 can be increased, and eddy current loss of the rotor core portion 6a can be achieved. Can be reduced, iron loss can be reduced, motor efficiency can be improved, and vibration and noise can be suppressed.

また、本永久磁石型モータを圧縮機に用いることにより、密閉容器７や吐出管２５、吸入管２６を伝わって発生していた騒音を抑制でき、空調機や冷蔵庫などユニットとしての騒音を低減することが可能である。即ち、振動・騒音を抑制できる効率の高い圧縮機となる。さらに、永久磁石型モータのロータ６の高密度部材部６ｂを積層体で形成することにより、永久磁石型モータの製造が容易となり圧縮機の低コスト化ができる。   Further, by using this permanent magnet type motor for the compressor, it is possible to suppress noise generated through the hermetic container 7, the discharge pipe 25, and the suction pipe 26, and to reduce noise as a unit such as an air conditioner or a refrigerator. It is possible. That is, it becomes a highly efficient compressor which can suppress vibration and noise. Furthermore, by forming the high-density member portion 6b of the rotor 6 of the permanent magnet motor as a laminated body, the permanent magnet motor can be easily manufactured and the cost of the compressor can be reduced.

実施の形態２．
図６は、この発明の実施の形態２を示す圧縮機駆動用の永久磁石型モータを組み込んだ圧縮機の縦断面図であり、図７、図８は、それぞれ、同じく永久磁石型モータのロータ鉄心部の横断面図と高密度部材部の横断面図であり、図９、図１０は、それぞれ、同じく永久磁石型モータの別のロータ鉄心部の横断面図と高密度部材部の横断面図である。
本実施の形態では、ロータ６のロータ鉄心部６ａの端部に設けた高密度部材部６ｂの材質を金属の磁性体で構成し、且つ、高密度部材部６ｂの外形寸法Ｄ３をロータ鉄心部６ａに設けた磁石挿入孔９の外形寸法Ｄ４以下となるように構成している。更に、ロータ鉄心部６ａの端部に設けた高密度部材部６ｂは、少なくとも一面に絶縁皮膜を施した0.3〜0.5ｍｍ程度の薄い電磁鋼板を一枚づつ積層して構成する。 Embodiment 2. FIG.
FIG. 6 is a longitudinal sectional view of a compressor incorporating a permanent magnet type motor for driving a compressor according to Embodiment 2 of the present invention. FIGS. 7 and 8 are respectively a rotor of a permanent magnet type motor. FIG. 9 and FIG. 10 are respectively a cross-sectional view of another rotor core portion and a cross-sectional view of the high-density member portion of the permanent magnet motor, respectively. FIG.
In the present embodiment, the material of the high density member 6b provided at the end of the rotor core 6a of the rotor 6 is made of a metal magnetic material, and the outer dimension D3 of the high density member 6b is set to the rotor core. The outer diameter D4 of the magnet insertion hole 9 provided in 6a is set to be equal to or smaller than D4. Furthermore, the high density member portion 6b provided at the end of the rotor core portion 6a is formed by laminating thin magnetic steel sheets of about 0.3 to 0.5 mm each having an insulating film on at least one surface.

高密度部材部６ｂは、ロータ鉄心部６ａの上端及び下端の両方に取付けなくても、どちらか一端に取付けてもよい点、及びロータ鉄心部６ａとステータ鉄心部５ａ、それぞれの軸方向の長さを略同一とするか、または、略同一長さの永久磁石１０を設けるロータ鉄心部６ａの軸方向長さをステータ鉄心部５ａの軸方向の長さより長くする点を含めて、その他の構成は実施の形態１と同様であるので、以下、主として相違点を説明する。   The high density member portion 6b may be attached to either one of the upper end and the lower end of the rotor core portion 6a, or may be attached to either end, and the axial lengths of the rotor core portion 6a and the stator core portion 5a. Other configurations including the point that the axial length of the rotor core portion 6a in which the permanent magnets 10 having substantially the same length or substantially the same length are provided is longer than the axial length of the stator core portion 5a. Since this is the same as that of the first embodiment, the difference will be mainly described below.

図７、図８に示すロータ６のロータ鉄心部６ａと高密度部材部６ｂの例では、駆動軸１３の軸方向と直交するロータ鉄心部６ａの断面上で、六角形状に配置した磁石挿入孔９に平板の希土類磁石である永久磁石１０を挿入する。また、駆動軸１３の軸方向と直交するロータ鉄心部６ａの断面（ロータ鉄心部６ａの軸直交面）上で、対向する磁石挿入孔９の外形寸法をＤ４とし、駆動軸１３の軸方向と直交する高密度部材部６ｂの断面（高密度部材部６ｂの軸直交面）での軸方向相当の高密度部材部６ｂの外形寸法をＤ３とすると、軸方向で対応するＤ３、Ｄ４の関係がＤ３≦Ｄ４とする。即ち、高密度部材部６ｂの軸直交断面の外形寸法Ｄ３を磁石挿入孔９の軸直交断面の軸方向対応の外形寸法Ｄ４以下とする。   In the example of the rotor core portion 6a and the high-density member portion 6b of the rotor 6 shown in FIGS. 7 and 8, magnet insertion holes arranged in a hexagonal shape on the cross section of the rotor core portion 6a orthogonal to the axial direction of the drive shaft 13 A permanent magnet 10, which is a flat rare earth magnet, is inserted into 9. Further, on the cross section of the rotor core portion 6a orthogonal to the axial direction of the drive shaft 13 (axis orthogonal surface of the rotor core portion 6a), the outer dimension of the opposing magnet insertion hole 9 is D4, and the axial direction of the drive shaft 13 When the outer dimension of the high-density member portion 6b corresponding to the axial direction in the cross section of the orthogonal high-density member portion 6b (axial orthogonal surface of the high-density member portion 6b) is D3, the relationship between D3 and D4 corresponding in the axial direction is D3. It is assumed that D3 ≦ D4. That is, the outer dimension D3 of the high-density member portion 6b in the axis-orthogonal cross section is set to be equal to or smaller than the outer dimension D4 corresponding to the axial direction of the axis-orthogonal section of the magnet insertion hole 9.

また、別の例として、図９で示すように、ロータ鉄心部６ａの軸直交断面で、１２枚の永久磁石１０をＶ字型に配置した場合は、高密度部材部６ｂの軸直交断面は図１０で示すようになり、同様にＤ３、Ｄ４の関係をＤ３≦Ｄ４とし、高密度部材部６ｂの軸直交断面の外形寸法Ｄ３を磁石挿入孔９の軸直交断面の軸方向対応外形寸法Ｄ４以下とする。   As another example, as shown in FIG. 9, when 12 permanent magnets 10 are arranged in a V shape in the axial orthogonal cross section of the rotor core portion 6 a, the axial orthogonal cross section of the high density member portion 6 b is Similarly, the relationship between D3 and D4 is set to D3 ≦ D4, and the external dimension D3 of the high-density member portion 6b is perpendicular to the axial direction of the high-density member 6b. The following.

以上のように、本実施の形態の永久磁石型モータによれば、ロータ鉄心部６ａの軸方向の端部に磁性金属製の高密度部材部６ｂを設け、該高密度部材部６ｂとロータ鉄心部６ａの磁石挿入孔９、それぞれの軸直交断面での軸方向対応の外形寸法をＤ３、Ｄ４としたとき、Ｄ３≦Ｄ４としたので、実施の形態１と同様に高密度部材部６ｂにより、低振動・低騒音の圧縮機モータを実現でき、かつ、Ｄ３≦Ｄ４の関係から、永久磁石１０の磁路形成による有効磁束の減少が防止でき、銅損を低減できる（課題Ａの解消）。   As described above, according to the permanent magnet motor of the present embodiment, the magnetic metal high-density member 6b is provided at the axial end of the rotor core 6a, and the high-density member 6b and the rotor core are provided. When the outer dimensions corresponding to the axial direction in the magnet insertion hole 9 of the portion 6a and the respective axial cross sections are D3 and D4, since D3 ≦ D4, the high-density member portion 6b as in the first embodiment A compressor motor with low vibration and low noise can be realized, and from the relationship of D3 ≦ D4, reduction of effective magnetic flux due to formation of the magnetic path of the permanent magnet 10 can be prevented, and copper loss can be reduced (solving of the problem A).

また、高密度部材部６ｂにより、低振動・低騒音の実現とともに、高密度部材部６ｂを厚さの薄い磁性金属板を絶縁皮膜を介して積層して形成したので、ステータ巻線１１によるロータ鉄心部６ａの渦電流損失が低減でき、鉄損を低減できる圧縮機モータを実現できる（課題Ｃの解消）。
なお、磁性金属板は、非磁性金属板でも課題Ｃの解消に有効である。 Further, the high-density member portion 6b realizes low vibration and low noise, and the high-density member portion 6b is formed by laminating a thin magnetic metal plate with an insulating film interposed therebetween. The eddy current loss of the iron core portion 6a can be reduced, and a compressor motor that can reduce the iron loss can be realized (solvent C).
In addition, even if a magnetic metal plate is a non-magnetic metal plate, it is effective in solving the problem C.

また、高密度部材部６ｂの形状を、磁石挿入孔９の外径寸法Ｄ４よりも若干小さく、磁石挿入孔９の内径寸法より大きくなるように構成することで、軸方向の永久磁石１０の保持を容易にすることができる。   Further, the configuration of the high-density member portion 6b is configured to be slightly smaller than the outer diameter dimension D4 of the magnet insertion hole 9 and larger than the inner diameter dimension of the magnet insertion hole 9, thereby holding the permanent magnet 10 in the axial direction. Can be made easier.

また、ロータ鉄心部６ａと同様に高密度部材部６ｂも積層鉄心によって構成（厚さの薄い磁性金属板の積層）されているため、ロータ鉄心部６ａと同一の順送金型内で高密度部材部６ｂを製造することができ、製造工程を低減した低コストな永久磁石型モータが提供できる。   Further, since the high-density member portion 6b is also composed of a laminated core (laminate of thin magnetic metal plates) in the same manner as the rotor core portion 6a, the high-density member in the same progressive die as the rotor core portion 6a. The part 6b can be manufactured, and a low-cost permanent magnet type motor with a reduced manufacturing process can be provided.

また、本永久磁石型モータを用いることにより、低騒音で高効率の圧縮機を実現できる。さらに、永久磁石型モータのロータ６の高密度部材部６ｂを積層体で形成することにより、永久磁石型モータの製造が容易となり圧縮機の低コスト化ができる。   Further, by using this permanent magnet type motor, a low noise and high efficiency compressor can be realized. Furthermore, by forming the high-density member portion 6b of the rotor 6 of the permanent magnet motor as a laminated body, the permanent magnet motor can be easily manufactured and the cost of the compressor can be reduced.

実施の形態１、２において、永久磁石型モータは、ロータ鉄心部６ａの端部に高密度材からなる高密度部材部６ｂを設けることにより、ロータ６の慣性力を増大させ、モータの振動・騒音を低減し、同時に課題Ａ、Ｂ、Ｃを解消する特徴ある構成を設けることにより効率を向上できるが、これらの課題Ａ、Ｂ、Ｃを解消する構成は、少なくとも一構成は設けることにより効率を向上でき、さらに複数設けることにより、より高い効率の向上が可能となる。
また、このような永久磁石型モータを圧縮機に使用することにより、振動・騒音を低減し、同時に課題Ａ、Ｂ、Ｃの少なくともいずれかを解消する効率の高い圧縮機を得ることができる。 In the first and second embodiments, the permanent magnet type motor increases the inertial force of the rotor 6 by providing the high-density member portion 6b made of a high-density material at the end of the rotor core portion 6a. The efficiency can be improved by providing a characteristic configuration that reduces noise and solves the problems A, B, and C at the same time, but the configuration that eliminates these problems A, B, and C is efficient by providing at least one configuration. Further improvement of efficiency can be achieved by providing more than one.
Moreover, by using such a permanent magnet type motor for the compressor, it is possible to obtain a highly efficient compressor that reduces vibration and noise and simultaneously eliminates at least one of the problems A, B, and C.

この発明の実施の形態１を示す圧縮機駆動用の永久磁石型モータを組み込んだ圧縮機の縦断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view of the compressor incorporating the permanent magnet type motor for a compressor drive which shows Embodiment 1 of this invention. 図１のロータの横断面図である。It is a cross-sectional view of the rotor of FIG. 図１の圧縮機の圧縮機機構部を示す簡略図である。FIG. 2 is a simplified diagram illustrating a compressor mechanism of the compressor of FIG. 1. 圧縮機の圧力変動を示す概念図である。It is a conceptual diagram which shows the pressure fluctuation of a compressor. 永久磁石型モータの電流波形を示した図である。It is the figure which showed the current waveform of the permanent magnet type motor. この発明の実施の形態２を示す圧縮機駆動用の永久磁石型モータを組み込んだ圧縮機の縦断面図である。It is a longitudinal cross-sectional view of the compressor incorporating the permanent magnet type motor for compressor drive which shows Embodiment 2 of this invention. 図６の永久磁石型モータのロータ鉄心部の横断面図である。It is a cross-sectional view of the rotor core part of the permanent magnet type motor of FIG. 図６の永久磁石型モータの高密度部材部の横断面図である。It is a cross-sectional view of the high-density member part of the permanent magnet type motor of FIG. 図６の永久磁石型モータの別のロータ鉄心部の横断面図である。It is a cross-sectional view of another rotor core part of the permanent magnet type motor of FIG. 図６の永久磁石型モータの別の高密度部材部の横断面図である。It is a cross-sectional view of another high-density member part of the permanent magnet type motor of FIG.

符号の説明Explanation of symbols

５ ステータ、５ａ ステータ鉄心部、６ ロータ、６ａ ロータ鉄心部、６ｂ 高密度部材部、９ 磁石挿入孔、１０ 永久磁石、１１ 巻線、１３ 駆動軸。   5 Stator, 5a Stator core, 6 Rotor, 6a Rotor core, 6b High density member, 9 Magnet insertion hole, 10 Permanent magnet, 11 Winding, 13 Drive shaft.

Claims (5)

駆動軸と、希土類磁石からなる永久磁石が挿入され、中心を貫通する前記駆動軸に固定されて一体に回転するロータ鉄心部を有するロータと、前記ロータ鉄心部の外周部から所定の間隙を設けて前記ロータ鉄心部を囲むように形成されたステータ鉄心部を有し、巻線が施されたステータとを備えた永久磁石型モータにおいて、
前記ロータ鉄心部の軸方向の端部にロータの慣性力を増加させる高密度部材からなる筒体状の高密度部材部を設け、該高密度部材部の外径寸法を前記ロータ鉄心部の外径寸法より小さくし、
前記ロータを含む前記高密度部材部の前記軸方向と平行な方向の長さは、前記ステータ鉄心部の前記軸方向と平行な方向の長さに対して、２〜３倍である
ことを特徴とする永久磁石型モータ。 A drive shaft and a rotor having a permanent magnet made of a rare earth magnet inserted therein, a rotor core portion fixed to the drive shaft passing through the center and rotating integrally, and a predetermined gap provided from an outer peripheral portion of the rotor core portion In a permanent magnet type motor having a stator core portion formed so as to surround the rotor core portion and having a stator provided with windings,
The rotor core part cylinder-shaped dense member portion at an end portion in the axial direction made of a high density member that increases the inertia of the rotor of providing, the outer diameter of the dense member portion of the rotor core portion Smaller than the outer diameter ,
The length of the high-density member portion including the rotor in the direction parallel to the axial direction is 2 to 3 times the length of the stator core portion in the direction parallel to the axial direction. Permanent magnet type motor. 前記ロータ鉄心部の軸方向の端部に非磁性金属製の高密度部材部を設けたことを特徴とする請求項１記載の永久磁石型モータ。   2. The permanent magnet type motor according to claim 1, wherein a high-density member made of nonmagnetic metal is provided at an end of the rotor core in the axial direction. 前記高密度部材部を、厚さの薄い金属板の積層で形成したことを特徴とする請求項１記載の永久磁石型モータ。   2. The permanent magnet motor according to claim 1, wherein the high-density member portion is formed by stacking thin metal plates. 前記高密度部材部を、厚さの薄い金属板を絶縁皮膜を介して積層して形成したことを特徴とする請求項１記載の永久磁石型モータ。   2. The permanent magnet motor according to claim 1, wherein the high-density member portion is formed by laminating thin metal plates with an insulating film interposed therebetween. 圧縮機のモータに、請求項１〜請求項４のいずれかの請求項に記載の永久磁石型モータを使用したことを特徴とする圧縮機。   A compressor using the permanent magnet type motor according to any one of claims 1 to 4 as a motor of the compressor.
JP2007340332A 2007-12-28 2007-12-28 Permanent magnet type motor and compressor Expired - Lifetime JP4712026B2 (en)

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Publication number Priority date Publication date Assignee Title
JPH0712078A (en) * 1993-04-30 1995-01-17 Sanyo Electric Co Ltd Rotor of electric motor for compressor
JPH0870541A (en) * 1994-08-30 1996-03-12 Toshiba Corp Permanent magnet-type rotating electric machine
JP2001342954A (en) * 2000-05-31 2001-12-14 Sanyo Electric Co Ltd Electric compressor and cooling system using the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0712078A (en) * 1993-04-30 1995-01-17 Sanyo Electric Co Ltd Rotor of electric motor for compressor
JPH0870541A (en) * 1994-08-30 1996-03-12 Toshiba Corp Permanent magnet-type rotating electric machine
JP2001342954A (en) * 2000-05-31 2001-12-14 Sanyo Electric Co Ltd Electric compressor and cooling system using the same

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