JP2009239988A - Permanent magnet type motor - Google Patents

Permanent magnet type motor Download PDF

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Publication number
JP2009239988A
JP2009239988A JP2008079180A JP2008079180A JP2009239988A JP 2009239988 A JP2009239988 A JP 2009239988A JP 2008079180 A JP2008079180 A JP 2008079180A JP 2008079180 A JP2008079180 A JP 2008079180A JP 2009239988 A JP2009239988 A JP 2009239988A
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Prior art keywords
permanent magnet
rotor
stator
protective member
cylindrical
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JP5058044B2 (en
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Toru Ogawa
徹 小川
Daisuke Nishijima
大輔 西島
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2793—Rotors axially facing stators
    • H02K1/2795—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a permanent magnet type motor which excels in shock resistance, electromechanical characteristics, and retention of permanent magnet. <P>SOLUTION: The permanent magnet type motor which is equipped with a stator, where coils are inserted into the slots of a cylindrical stator core, and a rotor 20, where a plurality of permanent magnets 24 are arranged in its circumferential direction at the peripheral face of the cylindrical rotor core 22 and which is arranged within the stator, is equipped with a cylindrical resinous protective member 26, which covers the peripheries of the plurality of permanent magnets 24, and a disk-shaped metallic protective member 28, which covers the ends of the permanent magnets 24 and the rotor core 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、永久磁石式モータに関するものである。   The present invention relates to a permanent magnet motor.

従来、回転子軸と、該回転子軸へ固着されている円筒形状の鉄心と、該鉄心の外周へ固着されている永久磁石と、を有しており、該鉄心と永久磁石の両端部が非磁性材料素材（例えば、金属製材料、ガラスバインド、合成樹脂）の永久磁石飛散防止カバーによって覆われている永久磁石型ロータがある（例えば、特許文献１参照）。   Conventionally, it has a rotor shaft, a cylindrical iron core fixed to the rotor shaft, and a permanent magnet fixed to the outer periphery of the iron core, and both ends of the iron core and the permanent magnet are There is a permanent magnet type rotor covered with a permanent magnet scattering prevention cover made of a non-magnetic material (for example, metal material, glass binding, synthetic resin) (for example, see Patent Document 1).

また、円筒形状の鉄心部の周方向に複数個の磁石が貼付されている磁石ロータと、該磁石ロータの半径方向内側または外側に配設されており、前記磁石に対応してコイルが巻回されているステータとからなるモータにおける前記磁石ロータであって、前記鉄心部の端部に前記磁石の端部を覆うための鉄製または非磁性のステンレス製の端板が設けられてなり、磁石の飛散を防止した磁石ロータがある（例えば、特許文献２参照）。   Also, a magnet rotor having a plurality of magnets attached in the circumferential direction of the cylindrical iron core, and a radially inner side or outer side of the magnet rotor, a coil is wound around the magnet rotor. A magnet rotor in a motor comprising a stator, wherein an end plate made of iron or non-magnetic stainless steel for covering the end of the magnet is provided at an end of the iron core, There is a magnet rotor that prevents scattering (see, for example, Patent Document 2).

特開２００１−０２５１９３号公報JP 2001-025193 A 登録実用新案第３００８２７２号公報Registered Utility Model No. 3008272

上記特許文献１又は２に記載された従来の技術では、ロータの端部を金属製又は樹脂製の保護カバーで覆っている。しかしながら、金属製の保護カバーは、機械的強度は高いが、磁界の影響による発熱が大きく電気的特性は劣る。一方、樹脂製の保護カバーは、発熱はしないが、耐衝撃性が弱く、モータ組立時に永久磁石の吸引力によりステータコアと衝突し、その衝撃で樹脂製の保護カバーが破損することがある、という問題があった。   In the conventional technique described in Patent Document 1 or 2, the end of the rotor is covered with a protective cover made of metal or resin. However, the metal protective cover has high mechanical strength, but generates a large amount of heat due to the influence of a magnetic field and has poor electrical characteristics. On the other hand, the protective cover made of resin does not generate heat, but the impact resistance is weak, and when the motor is assembled, it may collide with the stator core due to the attractive force of the permanent magnet, and the protective cover made of resin may be damaged by the impact. There was a problem.

また、上記従来の技術では、ロータの軸端部だけを覆っているので、軸方向に複数個の永久磁石を配置するロータにおいては、軸方向中間部に配置された永久磁石を保持することができない、という問題があった。   Further, in the above conventional technique, only the shaft end portion of the rotor is covered. Therefore, in the rotor in which a plurality of permanent magnets are arranged in the axial direction, the permanent magnets arranged in the intermediate portion in the axial direction can be held. There was a problem that it was not possible.

本発明は、上記に鑑みてなされたものであって、耐衝撃性、電機的特性及び永久磁石の保持性に優れた永久磁石式モータを得ることを目的とする。   The present invention has been made in view of the above, and an object of the present invention is to obtain a permanent magnet motor that is excellent in impact resistance, electrical characteristics, and retention of permanent magnets.

上述した課題を解決し、目的を達成するために、本発明は、円筒状に形成されたステータコアのスロットにコイルが挿入されたステータと、円筒状に形成されたロータコアの外周面に周方向に複数個の永久磁石が設置され、前記ステータ内に配置されるロータと、を備えた永久磁石式モータにおいて、前記複数個の永久磁石の外周部を覆う円筒状の樹脂製保護部材と、前記永久磁石及びロータコアの端部を覆う円板状の金属製保護部材と、を備えることを特徴とする。   In order to solve the above-described problems and achieve the object, the present invention provides a stator in which a coil is inserted into a slot of a stator core formed in a cylindrical shape, and a circumferential surface on an outer peripheral surface of a rotor core formed in a cylindrical shape. In a permanent magnet motor comprising a plurality of permanent magnets and a rotor disposed in the stator, a cylindrical resin protective member covering an outer periphery of the plurality of permanent magnets, and the permanent And a disc-shaped metal protective member that covers the end portions of the magnet and the rotor core.

この発明によれば、耐衝撃性、電機的特性及び永久磁石の保持性に優れ、磁界によるロータ発熱量を抑えた省エネルギーの永久磁石式モータが得られる、という効果を奏する。   According to the present invention, it is possible to obtain an energy-saving permanent magnet motor that is excellent in impact resistance, electrical characteristics, and permanent magnet retention, and that suppresses the amount of heat generated by the rotor due to a magnetic field.

以下に、本発明にかかる永久磁石式モータの実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Embodiments of a permanent magnet motor according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態
図１は、本発明にかかる永久磁石式モータの実施の形態のステータを示す斜視図であり、図２は、実施の形態のステータの横断面斜視図であり、図３は、実施の形態のロータの保護部材被覆前の斜視図であり、図４は、本発明にかかる永久磁石式モータの実施の形態のロータを示す斜視図であり、図５は、実施の形態のロータの縦断面図であり、図６は、実施の形態のロータの横断面図である。 Embodiment FIG. 1 is a perspective view showing a stator of an embodiment of a permanent magnet motor according to the present invention, FIG. 2 is a cross-sectional perspective view of the stator of the embodiment, and FIG. FIG. 4 is a perspective view showing a rotor of an embodiment of a permanent magnet motor according to the present invention, and FIG. 5 is a perspective view of the rotor of the embodiment. FIG. 6 is a longitudinal sectional view, and FIG. 6 is a transverse sectional view of the rotor according to the embodiment.

図１〜図６に示すように、本発明の永久磁石式モータの実施の形態の表面磁石式同期モータは、円筒状に形成されたステータ１０と、同じく円筒状に形成されステータ１０内に設置されるロータ２０と、を備えている。   As shown in FIGS. 1 to 6, the surface magnet type synchronous motor according to the embodiment of the permanent magnet type motor of the present invention is the same as the cylindrically formed stator 10 and is also installed in the stator 10. And the rotor 20 to be operated.

図１及び図２に示すように、ステータ１０は、軸方向に複数枚の円環状の電磁鋼板を積層して形成した円筒状のステータコア１２を備えている。ステータコア１２の内周側には、極数及び相数により決められた数の軸方向のスロット１２ａが形成されていて、スロット１２ａには、コイル１４が挿入されている。   As shown in FIGS. 1 and 2, the stator 10 includes a cylindrical stator core 12 formed by laminating a plurality of annular electromagnetic steel plates in the axial direction. A number of axial slots 12a determined by the number of poles and the number of phases are formed on the inner peripheral side of the stator core 12, and a coil 14 is inserted into the slot 12a.

図３に示すように、ロータ２０は、ステータ１０と同様に、軸方向に複数枚の円環状の電磁鋼板を積層して形成した円筒状のロータコア２２を備えている。ロータコア２２の外周表面には、周方向に分離された６個の永久磁石２４が貼付されて設置されている。ステータ１０内に、空隙を隔ててロータ２０を配置したものが、表面磁石式同期モータである。   As shown in FIG. 3, the rotor 20 includes a cylindrical rotor core 22 formed by laminating a plurality of annular electromagnetic steel plates in the axial direction, like the stator 10. Six permanent magnets 24 separated in the circumferential direction are affixed and installed on the outer peripheral surface of the rotor core 22. A surface magnet type synchronous motor has a rotor 20 disposed in the stator 10 with a gap.

表面磁石式同期モータのコイル１４に、交流電圧を印加すれば、コイル１４に交流電流が流れ、流れる交流電流と、永久磁石２４から発生する磁束と、によって生じる永久磁石界磁トルクにより、ロータ２０が回転する。   When an AC voltage is applied to the coil 14 of the surface magnet type synchronous motor, an AC current flows through the coil 14, and the rotor 20 is generated by the permanent magnet field torque generated by the flowing AC current and the magnetic flux generated from the permanent magnet 24. Rotates.

一般的に、同期モータには、磁石埋め込み式同期モータと表面磁石式同期モータとがあるが、高速回転仕様の同期モータとして用いるには、ステータ１０とロータ２０との間の空隙を大きくとる表面磁石式同期モータの方が有利である。表面磁石式同期モータの場合、駆動トルクは、永久磁石界磁トルクのみであるので、磁石を厚くしている。そのため、電気的空隙が大きくなり、ロータ２０が受けるスロット高調波や、インバータによる高調波成分の影響を抑えることができる。   Generally, the synchronous motor includes a magnet embedded type synchronous motor and a surface magnet type synchronous motor. In order to use the synchronous motor as a high-speed synchronous motor, a surface having a large gap between the stator 10 and the rotor 20 is used. A magnet synchronous motor is more advantageous. In the case of the surface magnet type synchronous motor, the driving torque is only the permanent magnet field torque, so the magnet is thickened. Therefore, the electrical gap is increased, and the influence of slot harmonics received by the rotor 20 and harmonic components by the inverter can be suppressed.

図４〜図６に示すように、実施の形態のロータ２０は、円筒状に形成されたロータコア２２の外周面に周方向に複数個の永久磁石２４が設置されている。複数個の永久磁石２４は、外周部を円筒状の樹脂製保護部材２６により覆われている。また、永久磁石２４及びロータコア２２の端部は、円板状の金属製保護部材２８、２８により覆われている。金属製保護部材２８の外径は、樹脂製保護部材２６の外径より若干（１ｍｍ以下）大きく形成されている。   As shown in FIGS. 4 to 6, the rotor 20 according to the embodiment has a plurality of permanent magnets 24 installed in the circumferential direction on the outer peripheral surface of a rotor core 22 formed in a cylindrical shape. The plurality of permanent magnets 24 are covered with a cylindrical resin protective member 26 on the outer periphery. Further, the end portions of the permanent magnet 24 and the rotor core 22 are covered with disk-shaped metal protection members 28 and 28. The outer diameter of the metal protective member 28 is slightly larger (1 mm or less) than the outer diameter of the resin protective member 26.

永久磁石２４の外周部を円筒状の樹脂製保護部材２６により覆い、永久磁石２４及びロータコア２２の端部を円板状の金属製保護部材２８、２８により覆ったので、磁界によるロータ発熱量を抑えることができる。また、金属製保護部材２８の外径を、樹脂製保護部材２６の外径より１ｍｍ程度大きくしたので、モータ組立時に、永久磁石２４の吸引力により、ロータ２０がステータ１０に衝突しても、樹脂製保護部材２６が破損するようなことはない。   Since the outer periphery of the permanent magnet 24 is covered with a cylindrical resin protective member 26 and the ends of the permanent magnet 24 and the rotor core 22 are covered with disk-like metal protective members 28 and 28, the amount of heat generated by the rotor due to the magnetic field is increased. Can be suppressed. In addition, since the outer diameter of the metal protective member 28 is about 1 mm larger than the outer diameter of the resin protective member 26, even if the rotor 20 collides with the stator 10 due to the attractive force of the permanent magnet 24 during motor assembly, The resin protective member 26 is not damaged.

次に、実施の形態のロータ２０の製造方法を説明する。まず、ロータコア２２の外周部に、ロータコア２２の軸長と同じ長さの永久磁石２４を、モータの極数に応じた個数、ロータコア２２の周方向に等間隔に接着する。接着後、永久磁石２４の外周面を、円柱状に研磨仕上げする。   Next, a method for manufacturing the rotor 20 of the embodiment will be described. First, permanent magnets 24 having the same length as the axial length of the rotor core 22 are bonded to the outer peripheral portion of the rotor core 22 at equal intervals in the circumferential direction of the rotor core 22 according to the number of poles of the motor. After bonding, the outer peripheral surface of the permanent magnet 24 is polished and finished in a cylindrical shape.

次に、一方の、円板キャップ状の金属製保護部材２８を、永久磁石２４及びロータコア２２の端部に、焼嵌めにより覆い被せる。続いて、樹脂製保護部材２６を、永久磁石２４の外周部に被せ、他方の金属製保護部材２８を、焼嵌めにより覆い被せる。最後に、永久磁石２４を後着磁すれば、実施の形態のロータ２０が完成する。   Next, one metal cap-shaped protective member 28 having a disc cap shape is covered with the end portions of the permanent magnet 24 and the rotor core 22 by shrink fitting. Subsequently, the resin protective member 26 is placed on the outer peripheral portion of the permanent magnet 24, and the other metal protective member 28 is covered by shrink fitting. Finally, if the permanent magnet 24 is post-magnetized, the rotor 20 of the embodiment is completed.

なお、樹脂製保護部材２６としては、糸状又は帯状の熱硬化性樹脂を、永久磁石２４の外周部に所定の厚さになるように巻き付け、加熱して硬化させたものでもよい。糸状又は帯状の熱硬化性樹脂を用いて樹脂製保護部材２６を成形するようにすれば、焼嵌め作業が不要となるので、組立作業性が向上し、金属製保護部材２８と樹脂製保護部材２６との間の隙間を無くすことができる。   In addition, as the resin protection member 26, a thread-shaped or belt-shaped thermosetting resin may be wound around the outer peripheral portion of the permanent magnet 24 so as to have a predetermined thickness, and heated and cured. If the resin protective member 26 is formed using a thread-like or belt-like thermosetting resin, the shrink-fitting operation becomes unnecessary, so that the assembly workability is improved, and the metal protective member 28 and the resin protective member are improved. 26 can be eliminated.

以上説明したように、実施の形態の永久磁石式モータは、円筒状に形成されたステータコア１２のスロット１２ａにコイル１４が挿入されたステータ１０と、円筒状に形成されたロータコア２２の外周面に周方向に複数個の永久磁石２４が設置され、ステータ１０内に配置されるロータ２０と、を備えた永久磁石式モータにおいて、複数個の永久磁石２４の外周部を覆う円筒状の樹脂製保護部材２６と、前記永久磁石２４及びロータコア２２の端部を覆う円板状の金属製保護部材２８と、を備えるので、耐衝撃性、電機的特性及び永久磁石２４の保持性に優れている。また、磁界によるロータ発熱量を抑え、省エネルギーのモータとなっている。   As described above, the permanent magnet motor according to the embodiment has the stator 10 in which the coil 14 is inserted into the slot 12a of the stator core 12 formed in the cylindrical shape and the outer peripheral surface of the rotor core 22 formed in the cylindrical shape. In a permanent magnet motor provided with a plurality of permanent magnets 24 in the circumferential direction and disposed in the stator 10, a cylindrical resin protection covering the outer periphery of the plurality of permanent magnets 24 Since the member 26 and the disk-shaped metal protective member 28 covering the end portions of the permanent magnet 24 and the rotor core 22 are provided, the impact resistance, the electrical characteristics, and the retainability of the permanent magnet 24 are excellent. In addition, the amount of heat generated by the rotor due to the magnetic field is suppressed, resulting in an energy saving motor.

以上のように、本発明にかかる永久磁石式モータは、工作機械等の産業機械用モータとして有用である。   As described above, the permanent magnet motor according to the present invention is useful as a motor for industrial machines such as machine tools.

本発明にかかる永久磁石式モータの実施の形態のステータを示す斜視図である。It is a perspective view which shows the stator of embodiment of the permanent magnet type motor concerning this invention. 実施の形態のステータの横断面斜視図である。It is a cross-sectional perspective view of the stator of embodiment. 実施の形態のロータの保護部材被覆前の斜視図である。It is a perspective view before the protection member coating | cover of the rotor of embodiment. 本発明にかかる永久磁石式モータの実施の形態のロータを示す斜視図である。It is a perspective view showing a rotor of an embodiment of a permanent magnet type motor concerning the present invention. 実施の形態のロータの縦断面図である。It is a longitudinal cross-sectional view of the rotor of an embodiment. 実施の形態のロータの横断面図である。It is a cross-sectional view of the rotor of the embodiment.

符号の説明Explanation of symbols

１０ ステータ
１２ ステータコア
１２ａ スロット
１４ コイル
２０ ロータ
２２ ロータコア
２４ 永久磁石
２６ 樹脂製保護部材
２８ 金属製保護部材 DESCRIPTION OF SYMBOLS 10 Stator 12 Stator core 12a Slot 14 Coil 20 Rotor 22 Rotor core 24 Permanent magnet 26 Resin protection member 28 Metal protection member

Claims (2)

円筒状に形成されたステータコアのスロットにコイルが挿入されたステータと、
円筒状に形成されたロータコアの外周面に周方向に複数個の永久磁石が設置され、前記ステータ内に配置されるロータと、
を備えた永久磁石式モータにおいて、
前記複数個の永久磁石の外周部を覆う円筒状の樹脂製保護部材と、
前記永久磁石及びロータコアの端部を覆う円板状の金属製保護部材と、
を備えることを特徴とする永久磁石式モータ。 A stator having a coil inserted in a slot of a stator core formed in a cylindrical shape;
A plurality of permanent magnets are installed in the circumferential direction on the outer peripheral surface of the rotor core formed in a cylindrical shape, and the rotor disposed in the stator;
In a permanent magnet motor with
A cylindrical resin protective member covering the outer periphery of the plurality of permanent magnets;
A disk-shaped metal protective member covering the end portions of the permanent magnet and the rotor core;
A permanent magnet motor comprising: 前記金属製保護部材の外径が、前記樹脂製保護部材の外径より大きいことを特徴とする請求項１に記載の永久磁石式モータ。   The permanent magnet motor according to claim 1, wherein an outer diameter of the metal protective member is larger than an outer diameter of the resin protective member.
JP2008079180A 2008-03-25 2008-03-25 Permanent magnet motor Expired - Fee Related JP5058044B2 (en)

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JP2008079180A JP5058044B2 (en) 2008-03-25 2008-03-25 Permanent magnet motor

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012105447A (en) * 2010-11-10 2012-05-31 Mitsubishi Electric Corp Permanent magnet rotor and manufacturing method thereof
US9755466B2 (en) 2010-08-24 2017-09-05 Dyson Technology Limited Rotor for an electrical machine
US10505414B2 (en) 2010-08-24 2019-12-10 Dyson Technology Limited Rotor core assembly
DE102021204934A1 (en) 2021-05-17 2022-11-17 Robert Bosch Gesellschaft mit beschränkter Haftung Rotor for an electric motor

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JPS60102850A (en) * 1983-11-09 1985-06-07 Yukigaya Seigyo Kenkyusho:Kk Rotor structure of rotary electric machine
JPH0279753A (en) * 1988-09-16 1990-03-20 Hitachi Ltd Magnet type rotor
JPH05207689A (en) * 1992-01-23 1993-08-13 Daikin Ind Ltd Permanent magnet type rotor
JPH1051985A (en) * 1996-08-02 1998-02-20 Shinko Electric Co Ltd Rotor shrink ring for high-speed synchronous generator and its manufacturing method
JP2001186727A (en) * 1999-12-24 2001-07-06 Shinko Electric Co Ltd Method of manufacturing rotor for high-speed rotary machine
JP2004048851A (en) * 2002-07-09 2004-02-12 Mitsubishi Electric Corp Rotary electric machine

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JPS57177263A (en) * 1981-04-22 1982-10-30 Hitachi Ltd Permanent magnet synchronous motor
JPS60102850A (en) * 1983-11-09 1985-06-07 Yukigaya Seigyo Kenkyusho:Kk Rotor structure of rotary electric machine
JPH0279753A (en) * 1988-09-16 1990-03-20 Hitachi Ltd Magnet type rotor
JPH05207689A (en) * 1992-01-23 1993-08-13 Daikin Ind Ltd Permanent magnet type rotor
JPH1051985A (en) * 1996-08-02 1998-02-20 Shinko Electric Co Ltd Rotor shrink ring for high-speed synchronous generator and its manufacturing method
JP2001186727A (en) * 1999-12-24 2001-07-06 Shinko Electric Co Ltd Method of manufacturing rotor for high-speed rotary machine
JP2004048851A (en) * 2002-07-09 2004-02-12 Mitsubishi Electric Corp Rotary electric machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9755466B2 (en) 2010-08-24 2017-09-05 Dyson Technology Limited Rotor for an electrical machine
US10505414B2 (en) 2010-08-24 2019-12-10 Dyson Technology Limited Rotor core assembly
US10756586B2 (en) 2010-08-24 2020-08-25 Dyson Technology Limited Rotor for an electrical machine
JP2012105447A (en) * 2010-11-10 2012-05-31 Mitsubishi Electric Corp Permanent magnet rotor and manufacturing method thereof
DE102021204934A1 (en) 2021-05-17 2022-11-17 Robert Bosch Gesellschaft mit beschränkter Haftung Rotor for an electric motor

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