WO2014167807A1 - Moteur synchrone à induction - Google Patents

Moteur synchrone à induction Download PDF

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Publication number
WO2014167807A1
WO2014167807A1 PCT/JP2014/001933 JP2014001933W WO2014167807A1 WO 2014167807 A1 WO2014167807 A1 WO 2014167807A1 JP 2014001933 W JP2014001933 W JP 2014001933W WO 2014167807 A1 WO2014167807 A1 WO 2014167807A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
rotor core
synchronous motor
induction synchronous
Prior art date
Application number
PCT/JP2014/001933
Other languages
English (en)
Japanese (ja)
Inventor
尾崎　行雄
周平 玉村
Original Assignee
パナソニック株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2014167807A1 publication Critical patent/WO2014167807A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/26—Asynchronous induction motors having rotors or stators designed to permit synchronous operation
    • 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
    • H02K1/223—Rotor cores with windings and permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present invention relates to an induction synchronous motor using a permanent magnet, and more particularly to a rotor thereof.
  • the induction synchronous motor is mounted on, for example, an electric compressor used for a refrigeration air conditioner.
  • the length of the rotor core is longer than the length of the permanent magnet in the axial direction of the rotating shaft to which the rotor core is fixed.
  • the length of a rotor core means the thickness of a rotor core.
  • Patent Document 1 As an example of this. This will be described using the drawings.
  • FIG. 6 is a sectional view of a rotor of a conventional induction synchronous motor.
  • the rotor iron plate 2a includes a buried hole 3 into which the permanent magnet 4 is inserted.
  • the rotor iron plate 2b laminated together with the rotor iron plate 2a includes a short-circuit prevention hole 7 that prevents the magnetic flux from being short-circuited.
  • the rotor core 2 is formed by laminating a plurality of rotor iron plates 2a. The rotor core 2 is laminated until the rotor iron plate 2a is longer than the length of the permanent magnet 4.
  • the permanent magnet 4 is inserted into the embedded hole 3 of the rotor core 2 stacked over the length of the permanent magnet 4.
  • the position of the inserted permanent magnet 4 is determined by contacting the end face 9 of the permanent magnet 4 positioned in the axial direction with the outer edge portion 8 of the short-circuit prevention hole 7. Therefore, in the axial direction, an electric motor in which the center of the length in the axial direction of the rotor core 2 and the center of the length in the axial direction of the permanent magnet 4 coincide is provided.
  • the axis 10 is indicated by a broken line.
  • the induction synchronous motor of the present invention includes a stator, a rotor, and a bearing portion.
  • the stator has a stator core and a winding wound around the stator core.
  • the rotor is positioned to face the inner peripheral surface of the stator core.
  • the rotor has a rotor core including an embedding hole in which a permanent magnet is embedded, and a rotating shaft that passes through the axis of the rotor core.
  • a bearing part contains the cylinder part in which a rotating shaft penetrates the inside, and supports a rotor rotatably.
  • the rotor core includes a recess on the upper surface of the rotor core positioned in the axial direction.
  • the concave portion includes an inner surface facing the surface of the rotation shaft over a depth D from the upper surface. The concave portion faces the cylindrical portion via a gap when the bearing portion is attached to the rotating shaft.
  • the length L1 of the permanent magnet is shorter than the length L2 of the rotor core in the axial direction. Further, in the permanent magnet, the end face of the permanent magnet located on the upper surface side is located in a place where the depth from the upper surface is deeper than D / 2.
  • FIG. 1 is a cross-sectional view of a compressor using an induction synchronous motor according to Embodiment 1 of the present invention.
  • FIG. 2 is a cross-sectional view showing a main part of the induction synchronous motor according to Embodiment 1 of the present invention.
  • FIG. 3A is a cross-sectional view showing the main part of the rotor of the induction synchronous motor.
  • 3B is a cross-sectional view taken along the line 3B-3B shown in FIG. 3A.
  • 3C is a cross-sectional view taken along 3C-3C shown in FIG. 3A.
  • FIG. 4 is a cross-sectional view showing the main parts of the rotor of the induction synchronous motor according to Embodiment 2 of the present invention.
  • FIG. 4 is a cross-sectional view showing the main parts of the rotor of the induction synchronous motor according to Embodiment 2 of the present invention.
  • FIG. 5 is a cross-sectional view showing the main parts of the rotor of the induction synchronous motor according to Embodiment 3 of the present invention.
  • FIG. 6 is a cross-sectional view of a rotor of a conventional induction synchronous motor.
  • the induction synchronous motor according to the embodiment of the present invention has the following effects due to the configuration described later. That is, in the axial direction of the rotor core, the bearing portion that supports the rotary shaft is inserted deeply toward the inside of the rotor core. A recess is formed in the rotor core so that the bearing portion and the rotor core do not come into contact with each other. Even if the recess is formed in the rotor core, the magnetic flux is not saturated. Therefore, according to the present invention, it is possible to provide an induction synchronous motor whose efficiency does not decrease.
  • the conventional induction synchronous motor had the following points to be improved. That is, in an induction synchronous motor, in order to reduce wear generated between the rotating shaft and the bearing portion, the bearing portion may be inserted deeply toward the inner side of the rotor core. In particular, when an induction synchronous motor is used for a compressor, this configuration becomes remarkable.
  • a concave portion is formed in the rotor core so that the bearing does not come into contact with the rotating rotor, particularly the rotor core.
  • the recess is formed on the inner surface of the rotor core that is in contact with the rotating shaft.
  • the recessed portion has a shape that is greatly recessed so as to have a gap between the inserted bearing portion.
  • a permanent magnet is inserted into the embedded hole included in the rotor core.
  • the magnetic circuit yoke portion formed by the recess and the embedding hole becomes narrow. Therefore, the magnetic flux is saturated in the magnetic circuit yoke portion. Since the magnetic flux is saturated, the torque constant decreases. As a result, there has been a problem that the efficiency of the induction synchronous motor is reduced.
  • the induction torque generated by the starting squirrel-cage conductor increases in the axial direction of the rotor core as the rotor stack thickness on the stator increases.
  • the lamination thickness of the rotor with respect to the stator is also referred to as the lamination length of the rotor.
  • the synchronous torque increases as the length of the permanent magnet increases in the axial direction of the rotor core.
  • the induction torque acts as a positive torque.
  • the induction synchronous motor it is not a synchronous operation. Therefore, when the induction synchronous motor is started, the synchronous torque generated by the permanent magnet acts as a negative torque.
  • the starting torque is a total torque obtained by adding the positive induction torque and the negative synchronous torque. That is, the shorter the length of the permanent magnet in the axial direction of the rotor, the better the startability.
  • the induction synchronous motor is operated synchronously. Therefore, the steady operation torque is greatly affected by the synchronous torque generated by the permanent magnet. Therefore, in order to increase the steady operation torque, it is necessary to increase the length of the permanent magnet in the axial direction of the rotor.
  • the induction synchronous motor has a permanent magnet length in the axial direction of the rotor. It may be shorter than the length.
  • FIG. 1 is a longitudinal sectional view of a compressor using an induction synchronous motor according to Embodiment 1 of the present invention.
  • FIG. 2 is a cross-sectional view showing a main part of the induction synchronous motor according to Embodiment 1 of the present invention.
  • FIG. 3A is a cross-sectional view showing the main part of the rotor of the induction synchronous motor.
  • FIG. 3A shows a 3A-3A cross-sectional view shown in FIG. 3B.
  • 3B is a cross-sectional view taken along the line 3B-3B shown in FIG. 3A.
  • 3C is a cross-sectional view taken along 3C-3C shown in FIG. 3A.
  • the compressor 50 includes an electric element 60 and a compression element 70 driven by the electric element 60 inside the sealed container 52.
  • the sealed container 52 compresses the refrigerant gas sucked from the suction pipe 54 by the compression element 70.
  • the compressed refrigerant gas is discharged from the discharge pipe 56 to the refrigeration cycle.
  • Oil 58 used for lubrication is present at the bottom of the sealed container 52.
  • the compression element 70 includes a crankshaft 72, a block 74, a piston 76, a connecting portion 77, and the like.
  • the crankshaft 72 has an eccentric shaft 78 and a rotating shaft 16.
  • An oil supply groove 80 is included on the surface of the rotating shaft 16.
  • the oil supply groove 80 supplies oil 58 present at the bottom of the sealed container 52 to the piston 76 and the like.
  • a cylinder 84 that forms a compression chamber 82 is formed integrally with the block 74.
  • the block 74 includes a bearing portion 11 that rotatably supports the rotating shaft 16.
  • the rotational motion generated on the rotary shaft 16 is transmitted as a reciprocating motion from the eccentric shaft 78 to the piston 76 via the connecting portion 77.
  • the compression element 70 compresses the refrigerant gas sent into the compression chamber 82 by the reciprocating motion of the piston 76.
  • the electric element 60 has a stator 30 below the block 74 and the rotor 1 inside the stator 30.
  • the stator 30 and the rotor 1 are located on the same axis.
  • a rotating shaft 16 is fixed to the rotor 1.
  • a voltage is applied to the windings of the stator 30 to generate a magnetic field.
  • the rotor 1 is rotated by this magnetic field.
  • the rotating shaft 16 fixed to the rotor 1 rotates.
  • the eccentric shaft 78 rotates via the crankshaft 72.
  • the rotation generated in the rotating shaft 16 is transmitted to the piston 76 via the eccentric shaft 78 and the connecting portion 77.
  • the rotation generated in the rotating shaft 16 through the crankshaft 72 is transmitted as a movement reciprocating the piston 76.
  • the piston 76 reciprocates in the cylinder 84.
  • the induction synchronous motor according to Embodiment 1 of the present invention includes a stator 30, a rotor 1, and a bearing portion 11.
  • the stator 30 has a stator core 32 and a winding 34 wound around the stator core 32.
  • the rotor 1 is positioned to face the inner peripheral surface of the stator core 32.
  • the rotor 1 has a rotor core 2 including an embedded hole 3 in which a permanent magnet 4 is embedded, and a rotating shaft 16 that passes through an axis 10 of the rotor core 2.
  • the bearing portion 11 includes a cylindrical portion 11a through which the rotary shaft 16 passes. The bearing part 11 supports the rotor 1 so that rotation is possible.
  • the rotor core 2 includes an inner surface 24 facing the surface 22 of the rotating shaft 16 over the depth D from the upper surface 20 on the upper surface 20 of the rotor core 2 positioned in the direction of the axis 10. Further, the rotor core 2 includes a concave portion 17 that faces the cylinder portion 11 a via a gap 18 when the bearing portion 11 is attached to the rotary shaft 16.
  • the length L 1 of the permanent magnet 4 is shorter than the length L 2 of the rotor core 2 in the direction of the axis 10. Further, in the permanent magnet 4, the end surface 4 a of the permanent magnet 4 positioned on the upper surface 20 side is positioned where the depth from the upper surface 20 is deeper than D / 2.
  • the rotor 1 has a rotor core 2 and a squirrel-cage conductor 15 for starting.
  • a plurality of embedded holes 3 are formed in the rotor core 2.
  • a permanent magnet 4 is inserted into each embedded hole 3.
  • the starting cage conductor 15 is located on the outer diameter side of the permanent magnet 4.
  • the rotor core 2 includes a recess 17 and a shrink-fitted portion 12 on the inner diameter side facing the rotation shaft 16.
  • the concave portion 17 is located on the inner diameter side of the rotor core 2 and on the side where the bearing portion 11 is attached.
  • the concave portion 17 has a shape that is recessed toward the inside of the rotor core 2 so that the bearing portion 11 enters deeply inside the rotor core 2.
  • the recess 17 includes an inner surface 24 that faces the surface 22 of the rotating shaft 16 over a depth D from the upper surface 20.
  • a gap 18 exists between the bearing portion 11 and the concave portion 17. Since the gap 18 exists, the bearing portion 11 does not contact the rotor 1.
  • the rotor core 2 and the rotating shaft 16 are fixed by a shrink-fitting portion 12.
  • the length L 1 of the permanent magnet 4 is shorter than the length L 2 of the rotor core 2 in the direction of the axis 10.
  • the end surface 4 a of the permanent magnet 4 positioned on the upper surface 20 side is positioned where the depth from the upper surface 20 is deeper than D / 2. That is, the end face 4 a of the permanent magnet 4 located near the recess 17 is positioned in the direction of the bottom surface 26 from the center position of the recess 17 in the direction of the axis 10.
  • a recess-side yoke portion 13 that is a magnetic circuit yoke portion is formed between the recess 17 and the permanent magnet 4.
  • a shrink-fit portion side yoke portion 14 that is a magnetic circuit yoke portion is formed between the shrink-fit portion 12 and the permanent magnet 4.
  • the range that can be used as the shrink-fit portion side yoke portion 14 is larger than the range that can be used as the recessed portion side yoke portion 13.
  • the magnetic circuit yoke part on the inner diameter side of the permanent magnet 4 may be widened. If the magnetic circuit yoke portion is widened, the saturation of the magnetic flux can be prevented and the torque constant can be increased.
  • a concave portion 17 is formed to recess the rotor core 2 inward.
  • the concave portion side yoke portion 13 formed by the concave portion 17 and the embedded hole 3 becomes narrow. Therefore, the magnetic flux is saturated in the concave-side yoke portion 13. Since the magnetic flux is saturated, the torque constant decreases. As a result, the efficiency of the induction synchronous motor is reduced.
  • the permanent magnet 4 has a permanent magnet end surface 4 a located on the upper surface 20 side where the depth from the upper surface 20 is deeper than D / 2. Located in. In other words, in a place where the depth from the upper surface 20 is shallower than D / 2, there is a portion where the permanent magnet 4 does not exist on the outer diameter side of the concave portion 17. This part has a low magnetic flux density.
  • the magnetic flux density generated on the outer diameter side of the concave portion 17 is increased in the portion where the permanent magnet 4 exists in a place where the depth from the upper surface 20 is deeper than D / 2.
  • the magnetic flux is directed from the portion where the magnetic flux density is high to the portion where the magnetic flux density is low. Therefore, since the magnetic flux density is relaxed, the magnetic flux can be prevented from being saturated. Since the saturation of the magnetic flux can be prevented, the torque constant does not decrease. As a result, the efficiency of the induction synchronous motor does not decrease even if the recess 17 is provided in the rotor core 2.
  • the bearing portion is inserted deeply toward the inner side of the rotor core.
  • the rotor core is formed with a recess facing the bearing portion via a gap so that the bearing portion and the rotor do not contact each other. Even with this configuration, it is possible to provide an induction synchronous motor whose efficiency does not decrease.
  • FIG. 4 is a cross-sectional view showing the main part of the rotor of the induction synchronous motor according to Embodiment 2 of the present invention.
  • the rotor core 2 includes a bottom surface 26 on the opposite side of the top surface 20 in the direction of the axis 10.
  • the end surface 4 b of the permanent magnet 4 positioned on the bottom surface 26 side is positioned on a surface including the bottom surface 26.
  • the permanent magnet 4 is brought closer to the bottom surface 26 side of the rotor core 2. In other words, the permanent magnet 4 is brought closer to the opposite side of the rotor core 2 in the direction of the axis 10.
  • FIG. 5 is a cross-sectional view showing the main part of the rotor of the induction synchronous motor according to Embodiment 3 of the present invention.
  • the length of the permanent magnet 4 is shorter in the direction of the axis 10 than the configuration described in the first and second embodiments.
  • the permanent magnet 4 does not exist on the outer diameter side of the recess 17. Therefore, the magnetic flux generated from the permanent magnet 4 is not affected by the formation of the recess 17. Therefore, the efficiency of the induction synchronous motor does not decrease.
  • the permanent magnet 4 used in each embodiment of the present invention is composed of at least one of a rare earth sintered magnet, a rare earth bonded magnet, or a ferrite magnet.
  • the induction synchronous motor has high efficiency because the amount of magnetic flux is high.
  • the induction synchronous motor can be reduced in size.
  • the rare earth bonded magnet can have a degree of freedom in the shape of the magnet. Therefore, the induction synchronous motor has an optimal magnetic circuit configuration.
  • the induction synchronous motor is provided with reduced cost.
  • the amount of magnetic flux, shape, price, and the like can be optimized as appropriate by changing the material of the magnet. Accordingly, it is possible to meet a wide variety of requirements and characteristics for the induction synchronous motor.
  • recesses may be formed on both sides of the rotor core in the axial direction.
  • the end face of the permanent magnet located on the upper surface side of the stator core may be located in a place where the depth from the upper surface is deeper than D / 2.
  • the end face of the permanent magnet positioned on the bottom surface side of the stator core may be positioned where the depth from the bottom surface is deeper than D / 2.
  • the induction synchronous motor according to the present invention even if a recess is provided so that the bearing portion is inserted deeply toward the rotor core, the efficiency does not decrease. Therefore, it is most suitable for the electric motor used for the compressor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un moteur synchrone à induction comprenant un stator (30), un rotor (1) et un palier (11). Une carcasse (2) du rotor (1) comprend un renfoncement (17) dans une surface supérieure située dans la direction d'un centre d'arbre (10). Le renfoncement (17) comprend une surface interne faisant face à la surface d'un arbre rotatif (16) sur une profondeur (D) à partir de la surface supérieure. Lorsque le palier (11) est fixé à l'arbre rotatif (16), le renfoncement (17) fait face à une partie cylindrique (11a) via un espace (18). Un aimant permanent (4) enfoui dans la carcasse du rotor (2) est configuré de sorte que la longueur (L1) de l'aimant permanent (4) soit plus courte que la longueur (L2) de la carcasse du rotor (2) dans la direction du centre d'axe (10). L'aimant permanent (4) est positionné avec sa surface d'extrémité supérieure située plus profondément que D / 2 à partir de la surface supérieure.
PCT/JP2014/001933 2013-04-11 2014-04-03 Moteur synchrone à induction WO2014167807A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-082741 2013-04-11
JP2013082741A JP2016119727A (ja) 2013-04-11 2013-04-11 永久磁石式誘導同期電動機

Publications (1)

Publication Number Publication Date
WO2014167807A1 true WO2014167807A1 (fr) 2014-10-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/001933 WO2014167807A1 (fr) 2013-04-11 2014-04-03 Moteur synchrone à induction

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JP (1) JP2016119727A (fr)
WO (1) WO2014167807A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107112831A (zh) * 2014-12-19 2017-08-29 马渊马达株式会社 电机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000134882A (ja) * 1998-10-21 2000-05-12 Matsushita Electric Ind Co Ltd 永久磁石モータのロータ及びそれを搭載したコンプレッサ
JP2001037126A (ja) * 1999-07-16 2001-02-09 Matsushita Electric Ind Co Ltd 自己始動形永久磁石式同期電動機
JP2008199833A (ja) * 2007-02-15 2008-08-28 Toyota Central R&D Labs Inc 回転電機
JP2009027842A (ja) * 2007-07-19 2009-02-05 Toshiba Corp 永久磁石同期電動機
JP2009195055A (ja) * 2008-02-15 2009-08-27 Toshiba Industrial Products Manufacturing Corp 回転電機
JP2012082783A (ja) * 2010-10-14 2012-04-26 Panasonic Corp 密閉型電動圧縮機

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000134882A (ja) * 1998-10-21 2000-05-12 Matsushita Electric Ind Co Ltd 永久磁石モータのロータ及びそれを搭載したコンプレッサ
JP2001037126A (ja) * 1999-07-16 2001-02-09 Matsushita Electric Ind Co Ltd 自己始動形永久磁石式同期電動機
JP2008199833A (ja) * 2007-02-15 2008-08-28 Toyota Central R&D Labs Inc 回転電機
JP2009027842A (ja) * 2007-07-19 2009-02-05 Toshiba Corp 永久磁石同期電動機
JP2009195055A (ja) * 2008-02-15 2009-08-27 Toshiba Industrial Products Manufacturing Corp 回転電機
JP2012082783A (ja) * 2010-10-14 2012-04-26 Panasonic Corp 密閉型電動圧縮機

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107112831A (zh) * 2014-12-19 2017-08-29 马渊马达株式会社 电机
CN107112831B (zh) * 2014-12-19 2019-05-21 马渊马达株式会社 电机

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