WO2017195498A1 - Rotor et machine électrique rotative - Google Patents

Rotor et machine électrique rotative Download PDF

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Publication number
WO2017195498A1
WO2017195498A1 PCT/JP2017/013730 JP2017013730W WO2017195498A1 WO 2017195498 A1 WO2017195498 A1 WO 2017195498A1 JP 2017013730 W JP2017013730 W JP 2017013730W WO 2017195498 A1 WO2017195498 A1 WO 2017195498A1
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WO
WIPO (PCT)
Prior art keywords
iron core
core piece
insertion hole
rotor
piece
Prior art date
Application number
PCT/JP2017/013730
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English (en)
Japanese (ja)
Inventor
愛子 中野
宏紀 立木
篤史 坂上
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Publication of WO2017195498A1 publication Critical patent/WO2017195498A1/fr

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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
    • 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

Definitions

  • the present invention relates to a rotor and a rotating electrical machine that can be reduced in magnetic flux leakage and can be assembled at low cost.
  • rotating electrical machines used as electric motors and generators are required to be downsized, rotated at high speed, and increased in output.
  • a rotating electric machine having a shape in which a magnet is embedded in a rotor has been proposed. This utilizes the reluctance torque and increases the generated torque by combining it with the magnet torque generated by the magnet.
  • Patent Document 1 a bridge portion is cut to reduce leakage of magnetic flux, and a connecting member made of a non-magnetic material is inserted into the cut bridge portion, and the iron core is rotated during rotation of the rotor. It has been proposed to relieve the applied stress concentration.
  • the conventional rotor has a problem in that the connecting member is inserted into the notched bridge portion, so that the number of parts and processes is increased, the assemblability is lowered, and the cost is increased.
  • the present invention has been made to solve the above-described problems.
  • a rotor and a rotating electrical machine that can be constructed at low cost with improved assemblability as well as reduced leakage of magnetic flux.
  • the purpose is to provide.
  • the rotor of the present invention is in a rotor including an iron core formed by laminating a plurality of annular core pieces in the axial direction, an insertion hole formed in the iron core, and a permanent magnet installed in the insertion hole,
  • the iron core is formed by laminating a plurality of first iron core pieces and second iron core pieces, The first iron core piece and the second iron core piece are respectively
  • the insertion hole and the permanent magnet are formed in a convex shape in the center direction of the iron core,
  • the insertion hole has an outer arc portion on the outer side in the radial direction of the iron core, and an inner arc portion on the inner side in the radial direction of the iron core, Between the end of the insertion hole on the outer peripheral surface side of the iron core and the outer peripheral surface of the iron core, a bridge portion is formed,
  • the bridge portion includes a first end portion having one end connected to the outer arc portion of the insertion hole, a third end portion having one end connected to the inner arc portion of
  • the first end, the second end, and the third end are each formed by a circular arc surface,
  • R1 the radius of the arc surface of the first end portion
  • R2 the radius of the arc surface of the second end portion
  • R3 the radius of the arc surface of the third end portion
  • the rotor of the present invention is in a rotor including an iron core formed by laminating a plurality of annular core pieces in the axial direction, an insertion hole formed in the iron core, and a permanent magnet installed in the insertion hole,
  • the iron core is formed by laminating a plurality of first iron core pieces and second iron core pieces, The first iron core piece and the second iron core piece are respectively
  • the insertion hole and the permanent magnet are formed in a convex shape in the center direction of the iron core,
  • the insertion hole has an outer arc portion on the outer side in the radial direction of the iron core, and an inner arc portion on the inner side in the radial direction of the iron core, Between the end of the insertion hole on the outer peripheral surface side of the iron core and the outer peripheral surface of the iron core, a bridge portion is formed,
  • the bridge portion includes a first end portion having one end connected to the outer arc portion of the insertion hole, a third end portion having one end connected to the inner arc portion of
  • the rotating electrical machine of the present invention is The rotor shown above, A stator disposed coaxially with the rotor.
  • the leakage of magnetic flux can be reduced, and the assemblability can be improved and it can be configured at low cost.
  • FIG. 1 It is a perspective view which shows the structure of the rotary electric machine in Embodiment 1 of this invention. It is a top view which shows the structure of the rotary electric machine shown in FIG. It is a top view which shows the structure of the rotor of the rotary electric machine shown in FIG. It is the elements on larger scale which show the structure of the 1st iron core piece which the rotor of FIG. 3 comprises. It is the elements on larger scale which show the structure of the 2nd core piece which the rotor of FIG. 3 comprises. It is a top view which shows the state which combined the 1st iron core piece shown in FIG. 4, and the 2nd iron core piece shown in FIG. It is sectional drawing which shows the state which combined the 1st iron core piece shown in FIG.
  • FIG. Embodiments of the present invention will be described below.
  • 1 is a perspective view showing a configuration of a rotating electrical machine according to Embodiment 1 of the present invention.
  • FIG. 2 is a top view showing the configuration of the rotating electrical machine shown in FIG.
  • FIG. 3 is a top view showing the configuration of the rotor of the rotating electrical machine shown in FIG.
  • FIG. 4 is a partially enlarged view showing the configuration of the first iron core piece constituting the rotor of FIG.
  • FIG. 5 is a partially enlarged view showing the configuration of the second core piece that the rotor of FIG. 3 configures.
  • FIG. 6 is a plan view showing a state in which the first core piece shown in FIG. 4 and the second core piece shown in FIG. 5 are combined.
  • FIG. 7 is a cross-sectional view showing a state in which the first core piece shown in FIG. 4 and the second core piece shown in FIG. 5 are combined.
  • each direction in the rotating electrical machine 1 is shown as a circumferential direction Z, an axial direction Y, a radial direction X, an outer side X1 in the radial direction X, and an inner side X2 in the radial direction X. Therefore, also in the stator 2 and the rotor 3, these directions are the same direction.
  • the rotating electrical machine 1 includes a stator 2, a rotor 3, and a shaft 4.
  • the rotating electrical machine 1 is arranged in the order of the stator 2, the rotor 3, and the shaft 4 from the outer diameter side.
  • the air gap 5 is formed with a thickness of 0.1 mm to 2.5 mm, for example.
  • the stator 2 includes a stator core 20 and a coil 21.
  • the stator core 20 is formed in an annular shape.
  • the stator core 20 is formed by, for example, laminating electromagnetic steel plates in the axial direction Y. However, it is not limited to electromagnetic steel sheets.
  • the rotor 3 has an iron core 30 fixed to the shaft 4 inserted through the axial center position.
  • the iron core 30 is a magnet-type rotor that is disposed inside the stator 2 and includes a permanent magnet (hereinafter referred to as a magnet) 6.
  • the shaft 4 is fixed to the iron core 30 by, for example, shrink fitting or press fitting.
  • the rotating electrical machine 1 can be either distributed winding or concentrated winding.
  • the rotor 3 includes an iron core 30, an insertion hole 7, and a magnet 6.
  • the iron core 30 is formed by laminating a plurality of iron core pieces 31 that are magnetic materials in the axial direction Y.
  • the iron core piece 31 is formed of an electromagnetic steel plate.
  • the thickness of the electromagnetic steel sheet is, for example, 0.1 mm to 1.0 mm.
  • the plurality of iron core pieces 31 are connected in the axial direction Y by a crimping portion 8 as a connecting portion.
  • the crimping portion 8 is shown only in FIG. 6 for convenience.
  • the formation portion and the number of formation may be any. Moreover, it is only necessary that the iron core piece 31 can be connected in the axial direction Y even if it is not the caulking portion 8, and for example, it is possible to use an adhesive portion made of an adhesive.
  • the magnet 6 is formed in a convex shape in the center direction of the rotating electrical machine 1, that is, the iron core 30.
  • the outer peripheral side of the magnet 6 is an outer arc portion 6A
  • the inner peripheral side of the magnet 6 is an inner arc portion 6B. Both ends of the outer arc portion 6A of the magnet 6 and the inner arc portion 6B of the magnet 6 are connected by a plane or a curved surface.
  • the insertion hole 7 is formed in a convex shape in the central direction of the rotating electrical machine 1, that is, the iron core 30.
  • An outer side X1 in the radial direction X of the iron core 30 of the insertion hole 7 is defined as an outer arc portion 7A.
  • An inner side X2 in the radial direction X of the iron core 30 of the insertion hole 7 is defined as an inner arc portion 7B.
  • the insertion hole 7 is configured in a shape into which the magnet 6 can be inserted. Therefore, the outer arc portion 7 ⁇ / b> A of the insertion hole 7 is formed in a shape along which the outer arc portion 6 ⁇ / b> A of the magnet 6 extends.
  • the inner arc portion 7B of the insertion hole 7 is formed in a shape along which the inner arc portion 6B of the magnet 6 is aligned.
  • An adhesive or the like is applied to the outer periphery of the magnet 6.
  • the magnet 6 and the insertion hole 7 are fixed with an adhesive.
  • a flux barrier 10 is formed in the insertion hole 7 as a portion where the magnet 6 is not installed.
  • the flux barrier 10 is composed of a nonmagnetic material or a space.
  • a bridge portion 9 is formed between the end of the insertion hole 7 on the outer peripheral surface 31 ⁇ / b> A side of the core piece 31 and the outer peripheral surface 31 ⁇ / b> A of the core piece 31.
  • the outer peripheral surface 31 ⁇ / b> A of the iron core piece 31 is the same as the outer peripheral surface of the iron core 30.
  • the bridge portion 9 has a first end portion 9A, a second end portion 9B, and a third end portion 9C.
  • One end of the first end 9 ⁇ / b> A is connected to the outer arc 7 ⁇ / b> A of the insertion hole 7.
  • One end of the third end portion 9 ⁇ / b> C is connected to the inner arc portion 7 ⁇ / b> B of the insertion hole 7.
  • the second end 9B connects the other end of the first end 9A and the other end of the third end 9C.
  • the first end 9A, the second end 9B, and the third end 9C are each formed by a circular arc surface.
  • the radius of the arc surface of the first end portion 9A is R1.
  • the radius of the arc surface of the second end portion 9B is R2.
  • the radius of the arc surface of the third end portion 9C is R3.
  • these relationships are formed by R2> R1 and R3.
  • the relationship between R1 and R3 may be either larger or equal.
  • the distance to the outer peripheral surface 31A of the iron core piece 31 of the bridge portion 9 of the first iron core piece 311 is defined as a distance W1.
  • the distance to the outer peripheral surface 31A of the iron core piece 31 of the bridge portion 9 of the second iron core piece 312 is defined as a distance W2.
  • the distance W2 between the second core pieces 312 is shorter than the distance W1 between the first core pieces 311. Therefore, the leakage of magnetic flux can be reduced in the bridge portion 9 of the second iron core piece 312 than in the bridge portion 9 of the first iron core piece 311.
  • the iron core 30 is formed by laminating only the second iron core pieces 312 formed as described above, the magnetic flux leakage can be reduced, but the strength as the rotor 3 is weakened. Therefore, the number of laminated first core pieces 311 and the number of laminated second core pieces 312 and the number of laminated portions are such that the strength required for the rotor 3 can be ensured, and the second core pieces 312 are set to be used as much as possible. . Further, since the distance W2 of the second core piece 312 is formed shorter than the distance W1 of the first core piece 311, the insertion hole 7 of the second core piece 312 is formed larger than the insertion hole 7 of the first core piece 311. Is done.
  • an assembly method for the rotating electrical machine 1 according to the first embodiment configured as described above will be described.
  • an assembly method for the stator 2 will be described.
  • the electromagnetic steel sheet is punched to form the stator core 20.
  • the method of forming the stator core 20 is not limited to punching of electromagnetic steel sheets.
  • the coil 21 is assembled in an annular shape. Insulating paper is attached to the coil 21. Then, the coil 21 is inserted into the stator core 20 through insulating paper.
  • the method for assembling the coil 21 and the stator core 20 is not limited to this method.
  • the electromagnetic steel sheet is punched to form the first iron core piece 311 and the second iron core piece 312 of the rotor 3.
  • the method of forming the iron core piece 31 is not limited to punching of an electromagnetic steel sheet.
  • the number of the first iron core pieces 311 and the second iron core pieces 312 are set so that the strength required for the rotor 3 can be ensured, and the first iron core pieces 311 and the second iron core pieces 311 are arranged in the axial direction Y.
  • the core pieces 312 are stacked.
  • the first iron core piece 311 and the second iron core piece 312 are connected in the axial direction Y at the caulking portion 8.
  • the magnet 6 is inserted into the insertion hole 7 of the iron core 30.
  • FIG. 6 is a plan view showing a state in which the second iron core piece 312 is overlaid on the first iron core piece 311. As shown in FIG. 6, since the insertion hole 7 of the second core piece 312 is formed larger than the insertion hole 7 of the first core piece 311, the second core piece 312 is overlaid on the first core piece 311. In this case, a part of the first iron core piece 311 can be seen at the end of the insertion hole 7 of the second iron core piece 312.
  • FIG. 7 is a partial cross-sectional view obtained by cutting the stacked state in the axial direction Y as shown in FIG.
  • FIG. 7 shows an example in which the iron core 30 is configured by combining a plurality of first iron core pieces 311 and a plurality of second iron core pieces 312 respectively.
  • the first core piece 311 and the second core piece 312 are stacked separately in a region, or the first core piece 311 and the second core piece 312 are randomly stacked. As long as the strength required for the rotor 3 can be ensured, any combination may be used.
  • the shaft 4 is fixed to the iron core 30.
  • the rotating electrical machine 1 is manufactured by assembling the stator 2 and the rotor 3.
  • the torque generated by the rotor is improved by having the insertion hole and the magnet that are convex in the center direction of the iron core. Furthermore, the leakage of magnetic flux is reduced by combining two types of the first core piece and the second core piece having different distances between the bridge portions. Further, since the radius R2 of the second end portion is formed larger than the radius R1 of the first end portion and the radius R3 of the third end portion, the stress applied to the bridge portion is reduced when the rotor rotates. .
  • a flux barrier made of a non-magnetic material or space is configured, leakage of magnetic flux is prevented and torque is improved. Furthermore, the amount of magnets used for the rotating electrical machine can be reduced, and the cost can be reduced.
  • the present invention is not limited to this, and the second end portion 9B can be formed with a flat surface.
  • the same effects as those of the first embodiment can be obtained.
  • the present invention is not limited to this, and it may be formed by a plurality of arc surfaces. is there. In that case, when the rotor is rotating, concentration of stress applied to the bridge portion can be further reduced.
  • FIG. 8 is a partially enlarged view showing the configuration of the first iron core piece formed by the rotor according to Embodiment 2 of the present invention.
  • FIG. 9 is a partially enlarged view showing the configuration of the second iron core piece formed by the rotor according to the second embodiment of the present invention.
  • FIG. 10 is a plan view showing a state in which the first core piece shown in FIG. 8 and the second core piece shown in FIG. 9 are combined.
  • FIG. 11 is a perspective view showing a state in which the first core piece shown in FIG. 8 and the second core piece shown in FIG. 9 are combined.
  • the bridge portion 9 of the second core piece 312 includes an opening 33 that communicates from the insertion hole 7 to the outer peripheral surface 31 ⁇ / b> A of the core piece 31.
  • the opening 33 By forming the opening 33, the leakage of magnetic flux is further reduced.
  • the size of the opening 33 is appropriately determined in view of magnetic flux leakage and centrifugal force. In FIG. 9, it is formed around the second end 9 ⁇ / b> B of the bridge portion 9, but may be formed at any position as long as it communicates from the insertion hole 7 to the outer peripheral surface 31 ⁇ / b> A of the core piece 31. .
  • the first iron core piece 311 and the second iron core piece 312 serve as a connecting portion that is connected in the axial direction Y to a location on the outer peripheral surface 31 ⁇ / b> A side of the iron core piece 31 from the insertion hole 7.
  • a crimping portion 81 is provided. This caulking portion 81 is for preventing the opening 33 formed in the bridge portion 9 of the second iron core piece 312 from separating the portion on the outer peripheral surface 31 ⁇ / b> A side of the iron core piece 31 from the insertion hole 7.
  • the core piece 31 should just be connectable to the axial direction Y, for example, can also use the adhesion part comprised with an adhesive agent.
  • FIG. 10 is a plan view showing a state in which the second iron core piece 312 is overlaid on the first iron core piece 311.
  • FIG. 11 is a partial cross-sectional view obtained by cutting the stacked state in the axial direction Y as shown in FIG.
  • the same effect as that of the first embodiment can be obtained, and from the insertion hole to the outer peripheral surface of the iron core piece in the bridge portion. Since the communicating opening is provided, magnetic flux leakage can be further reduced.
  • the connecting portion for connecting in the axial direction is provided at a position on the outer peripheral surface side of the core piece from the insertion hole, the core pieces in the axial direction can be fixed, and the core pieces can be fixed without being scattered.
  • the opening 33 is formed in the bridge portion 9 of the second iron core piece 312
  • the present invention is not limited to this, and the bridge portion 9 of the first iron core piece 311 is not limited to this. It is also possible to form similar openings.
  • FIG. 12 is a partially enlarged view showing the configuration of the first iron core piece formed by the rotor according to Embodiment 3 of the present invention.
  • FIG. 13 is a partially enlarged view showing the configuration of the second iron core piece formed by the rotor according to Embodiment 3 of the present invention.
  • 14 is a plan view showing a state in which the first iron core piece shown in FIG. 12 and the second iron core piece shown in FIG. 13 are combined.
  • FIG. 15 is a perspective view showing a state in which the first core piece shown in FIG. 12 and the second core piece shown in FIG. 13 are combined.
  • the pole bridge portion 12 is provided at the pole center of the iron core piece 31, and in the third embodiment, the insertion hole 7 is arranged in the circumferential direction Z at the pole center of the insertion hole 7. Divide into two. A plurality of pole bridge portions 12 may be formed, and the insertion hole 7 may be divided into two or more in the circumferential direction Z. As shown in FIG. 12, the first iron core piece 311 is formed with a communication hole 13 that communicates with the insertion hole 7 divided by the pole bridge portion 12. The magnets 6 are formed in shapes that can be inserted into the divided insertion holes 7 respectively.
  • the iron core of the insertion hole 7 of the second iron core piece 312 is formed.
  • the outer peripheral surface 31A side of the piece 31 is separated, in the third embodiment, since the pole bridge portion 12 is formed, this portion is not separated. Therefore, even if the caulking portion 81 as shown in the second embodiment is not formed, the second iron core piece 312 does not come apart.
  • FIG. 14 is a plan view showing a state in which the first iron core piece 311 is overlaid on the second iron core piece 312.
  • FIG. 15 is a partial cross-sectional view of the stacked state as shown in FIG.
  • the iron core piece is provided with the pole bridge portion and the communication hole as well as the same effects as the above-described embodiments.
  • the magnetic flux leakage is reduced and, of course, when the opening is formed in the bridge portion, the core pieces are integrally formed at the pole bridge portion. Can be reduced.
  • FIG. 16 is a partially enlarged view showing the structure of the first iron core piece which the rotor according to the fourth embodiment of the present invention constitutes.
  • FIG. 17 is a partially enlarged view showing the configuration of the second iron core piece which the rotor according to the fourth embodiment of the present invention constitutes.
  • 18 is a plan view showing a state in which the first core piece shown in FIG. 16 and the second core piece shown in FIG. 17 are combined.
  • 19 is a sectional view showing a state in which the first core piece shown in FIG. 16 and the second core piece shown in FIG. 17 are combined.
  • the same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted.
  • the inner arc portion 7 ⁇ / b> B of the insertion hole 7 is formed with a protrusion 14.
  • the magnet 6 can be positioned and fixed in the insertion hole 7. Therefore, when the magnet 6 is inserted into the insertion hole 7, it can be installed without fixing the magnet 6 with an adhesive or the like.
  • FIG. 18 is a plan view showing a state where the second iron core piece 312 is overlaid on the first iron core piece 311.
  • FIG. 19 is a partial cross-sectional view obtained by cutting the stacked state in the axial direction Y as shown in FIG.
  • the magnet position accuracy is improved by the projections of the insertion holes as well as the same effects as the above-described embodiments. improves.

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

Abstract

Selon la présente invention : une pluralité de premières pièces de noyau de fer (311) et une pluralité de secondes pièces de noyau de fer (312) ayant chacune un trou d'insertion (7), dans lequel est inséré un aimant (6), sont formées de manière à être empilées ; une partie de pont (9) est formée entre une extrémité du trou d'insertion (7), du côté surface périphérique externe (31A) d'une pièce de noyau de fer (31) et sur la surface périphérique externe (31A) de la pièce de noyau de fer (31) ; la partie de pont (9) présente une première extrémité (9A), une deuxième extrémité (9B) et une troisième extrémité (9C) ; la première extrémité (9A), la deuxième extrémité (9B) et la troisième extrémité (9C) sont formées de telle sorte que le rayon (R2) d'une surface arquée de la seconde extrémité (9B) soit supérieur au rayon (R1) d'une surface arquée de la première extrémité (9A) et supérieur au rayon (R3) d'une surface arquée de la troisième extrémité (9C) ; et chaque première pièce de noyau de fer (311) et chaque seconde pièce de noyau de fer (312) sont formées de telle sorte que la distance (W2), dans la seconde pièce de noyau de fer (312), de la partie de pont (9) à la surface périphérique externe (31A) de la pièce de noyau de fer (31) est inférieure à la distance (W1), dans la première pièce de noyau de fer (311), de la partie de pont (9) à la surface périphérique externe (31A) de la pièce de noyau de fer (31).
PCT/JP2017/013730 2016-05-11 2017-03-31 Rotor et machine électrique rotative WO2017195498A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016095393A JP2019126102A (ja) 2016-05-11 2016-05-11 回転子および回転電機
JP2016-095393 2016-05-11

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN111327135A (zh) * 2018-12-14 2020-06-23 Tdk株式会社 永磁铁和旋转电机
US20220085673A1 (en) * 2019-01-10 2022-03-17 Johnson Electric International AG Magnetic core, electric motor having magnetic core, and mower having electric motor
CN114503397A (zh) * 2019-10-11 2022-05-13 三菱电机株式会社 转子、电动机、压缩机以及空气调节机

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Publication number Priority date Publication date Assignee Title
JPWO2021095149A1 (ja) * 2019-11-13 2021-11-25 三菱電機株式会社 ロータ、回転電機及びロータの製造方法
JP7367552B2 (ja) * 2020-02-17 2023-10-24 株式会社デンソー ロータ

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EP2187503A2 (fr) * 2008-11-17 2010-05-19 Traktionssysteme Austria GmbH Machine à aimants permanents
JP2011004480A (ja) * 2009-06-17 2011-01-06 Meidensha Corp 永久磁石埋込式回転電機
JP2013255326A (ja) * 2012-06-06 2013-12-19 Hitachi Appliances Inc 永久磁石同期機
JP2014054046A (ja) * 2012-09-06 2014-03-20 Mitsubishi Electric Corp 回転電機の固定子及び回転電機
JP2014100048A (ja) * 2012-10-19 2014-05-29 Toshiba Corp 永久磁石型回転電機

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JPH11318049A (ja) * 1998-03-20 1999-11-16 Samsung Electronics Co Ltd 永久磁石埋込形モ―タ
JP2002010547A (ja) * 2000-06-16 2002-01-11 Yamaha Motor Co Ltd 永久磁石回転子及びその製造方法
JP2006109683A (ja) * 2004-10-08 2006-04-20 Asmo Co Ltd 回転電機
JP2007336671A (ja) * 2006-06-14 2007-12-27 Toshiba Mitsubishi-Electric Industrial System Corp 永久磁石回転電機の回転子
EP2187503A2 (fr) * 2008-11-17 2010-05-19 Traktionssysteme Austria GmbH Machine à aimants permanents
JP2011004480A (ja) * 2009-06-17 2011-01-06 Meidensha Corp 永久磁石埋込式回転電機
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Publication number Priority date Publication date Assignee Title
CN111327135A (zh) * 2018-12-14 2020-06-23 Tdk株式会社 永磁铁和旋转电机
CN111327135B (zh) * 2018-12-14 2022-12-16 Tdk株式会社 永磁铁和旋转电机
US20220085673A1 (en) * 2019-01-10 2022-03-17 Johnson Electric International AG Magnetic core, electric motor having magnetic core, and mower having electric motor
CN114503397A (zh) * 2019-10-11 2022-05-13 三菱电机株式会社 转子、电动机、压缩机以及空气调节机

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