WO2018043026A1 - Moteur du type à aimant de surface - Google Patents

Moteur du type à aimant de surface Download PDF

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Publication number
WO2018043026A1
WO2018043026A1 PCT/JP2017/028248 JP2017028248W WO2018043026A1 WO 2018043026 A1 WO2018043026 A1 WO 2018043026A1 JP 2017028248 W JP2017028248 W JP 2017028248W WO 2018043026 A1 WO2018043026 A1 WO 2018043026A1
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WO
WIPO (PCT)
Prior art keywords
rotor
magnet
rotor core
magnets
stator
Prior art date
Application number
PCT/JP2017/028248
Other languages
English (en)
Japanese (ja)
Inventor
俊幸 玉村
裕一郎 田代
康一 斉藤
Original Assignee
パナソニックＩｐマネジメント株式会社
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Ｉｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to JP2018537064A priority Critical patent/JP6667084B2/ja
Priority to CN201780052832.XA priority patent/CN109661760B/zh
Publication of WO2018043026A1 publication Critical patent/WO2018043026A1/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

  • Patent Document 2 there has been proposed a motor in which a plurality of magnets having a D-shaped cross section are arranged on the outer periphery of the rotor (see, for example, Patent Document 2).
  • a magnet insertion part having a restricting body at the opening is formed in the rotor yoke. And the magnet is inserted in the magnet insertion part so that a control body may be fitted in the to-be-engaged part of a magnet.
  • each of the plurality of magnets includes a first main surface that faces the outer peripheral surface of the rotor core, and a second main surface that faces the tip of the teeth.
  • the first main surface includes a flat surface portion that forms a flat surface
  • the tooth tip portion and the second main surface include curved surface portions that are concentric with the magnetic pole surface in a plane orthogonal to the shaft.
  • the rotor core and the plurality of magnets are integrally molded by the rotor resin portion so that the rotor resin portion covers the peripheral edge portion of the second main surface.
  • the magnet is usually formed by pressing a powdery raw material, followed by firing and molding into a desired shape. At this time, it is very difficult to mold a magnet having a curved surface along the outer peripheral surface of the rotor core as in Patent Document 4 with high accuracy. For example, if expansion or contraction occurs after press molding or after firing, the curvature of the curved surface changes and does not match the curved surface of the rotor core. Therefore, in the case of a configuration in which the curved surface of the magnet is arranged on the outer periphery of the rotor core as in Patent Document 4, the contact portion may be reduced due to a mismatch in curvature due to variations or the like, or in the worst case, contact may be made at a point. Maybe there is.
  • the plurality of teeth 31t are arranged at equal intervals in the circumferential direction while forming slots 31s, which are openings, between each other. Further, a tooth tip portion 31tp that extends in the circumferential direction is formed at the extended tip portion of each tooth 31t so as to be wider than the extending tooth intermediate portion 31tm.
  • the inner peripheral surface of the tooth tip portion 31tp is a magnetic pole surface 31t1 facing the magnet 10.
  • the magnetic pole surface 31t1 is formed to be a curved surface located on the circumference centered at the center point C in a plane orthogonal to the axial direction.
  • the rotor core 22 is configured by laminating thin iron plates having a substantially polygonal outer shape. More specifically, in the present embodiment, as shown in FIG. 1, the rotor core 22 includes an inner rotor core 22s and an outer rotor core 22m.
  • the inner rotor core 22 s is disposed on the inner peripheral side and is fixed to the shaft 21, and the outer rotor core 22 m is disposed on the outer peripheral side and holds the magnet 10.
  • a portion of the rotor resin portion 23 occupies a portion between the inner rotor core 22s and the outer rotor core 22m in the radial direction.
  • the configuration of the rotor main body 20b including the rotor core 22 in this embodiment will be described in detail below.
  • the plurality of magnets 10 are fixed to the outer peripheral surface of the rotor core 22 in parallel in the circumferential direction. That is, as shown in FIG. 2, the outer peripheral surface of the rotor core 22 has a polygonal columnar shape in which the magnet holding surfaces 220 for holding the magnets 10 are combined in a polygonal shape.
  • the magnet holding surface 220 is a square plane.
  • the magnets 10 correspond to each other on a one-to-one basis so that one magnet 10 is paired with one magnet holding surface 220.
  • the rotor core 22 since the number of magnetic poles of the rotor 20 is 10, the rotor core 22 has a 10-prism shape, and 10 magnets 10 are arranged on the outer peripheral surface thereof.
  • the magnet 10 is a substantially hexahedron having two main surfaces 11 and 12, a side surface 13, and an upper and lower surface 14 that are substantially rectangular.
  • one main surface (first main surface 11) of the magnet 10 includes a peripheral portion 111 provided on the four-side periphery so as to surround the flat portion 110 together with the flat portion 110 forming a flat surface.
  • the first main surface 11 faces the outer peripheral surface of the rotor core 22, that is, the magnet holding surface 220.
  • the magnet 10 having such a shape is magnetized in the thickness direction indicated by the normal direction Nv of the flat surface portion 110 in FIG. 4B so that the main surfaces become opposite magnetic poles. That is, in the first main surface 11 and the second main surface 12, if one surface is an S pole, the other surface is an N pole. Further, in the present embodiment, as shown in FIG. 2, the second main surface 12 is composed of two types of combinations of an S pole magnet 10 and a second main surface 12 of an N pole magnet 10. . And each magnet 10 is arrange
  • the flat portion 110 of the first main surface 11 is a plane parallel to the axial direction without bending in the circumferential direction and the axial direction.
  • Each of the magnets 10 is arranged on the outer peripheral surface of the rotor core 22 so that the flat portion 110 is in close contact with the magnet holding surface 220 of the rotor core 22.
  • the cross-section of the outer peripheral surface of the rotor core 22 is substantially polygonal, thereby achieving easy positioning of the magnet 10.
  • the magnet holding surface 220 and the magnet 10 on the outer peripheral surface of the rotor core 22 both have a flat portion.
  • the magnet 10 is press-molded or fired, it is a flat surface unlike a curved surface whose curvature is likely to change. Therefore, even if expansion or contraction occurs, the flat state can be easily maintained.
  • the magnet 10 can be brought into contact with the magnet holding surface 220 while maintaining a large area.
  • the magnet 10 having the flat portion 110 that can be manufactured easily and with high accuracy is realized as compared with a conventional magnet having a curved surface that comes into contact with the rotor core. Furthermore, since the contact portion of the magnet 10 with respect to the magnet holding surface 220 of the rotor core 22 can be increased, the magnet 10 can be more securely fixed to the magnet holding surface 220, and the play of the magnet 10 can be easily suppressed. As a result, noise during operation of the SPM motor 100 is reduced and efficiency is improved.
  • FIG. 5 is an enlarged view of FIG. 4B.
  • the curved surface portion 120 and the flat surface portion 110 are arranged at positions corresponding to each other as described above within the range indicated by the central angle ⁇ 4 in FIG.
  • the motor characteristics in the range indicated by the central angle ⁇ 4 in FIG. 5 will be described.
  • the thickness of the magnet in the normal direction Nv changes along the circumferential direction so as to decrease as the distance from the central portion of the magnet 10 increases.
  • it has a D-shaped cross section, and the thickness T in the radial direction of the central portion of the magnet 10 is the largest, and is thinner toward the end portion.
  • the thickness of the magnet affects the magnitude of the magnetic flux generated by the magnet. That is, the greater the magnet thickness, the greater the magnetic flux. Therefore, also in the magnet 10, the magnetic flux generated from the central portion is usually larger than the magnetic flux generated from the end portion. That is, in FIG. 6, the waveform of the sine wave having the largest central portion is shown by a solid line, but the magnetic flux density of the magnet 10 has a distribution close to such a sine wave waveform. Therefore, the rotation of the rotor 20 becomes smooth, and the cogging torque is reduced. Further, when the magnetic flux density has a distribution close to a sine wave, the waveform of the induced voltage is also close to a sine wave. Therefore, the torque ripple that is the fluctuation range of the torque is reduced.
  • the magnet 10 in the present embodiment includes a curved surface portion 120 and a flat surface portion 110 that face each other, thereby forming a D-shaped cross-sectional shape.
  • a shape of the magnet 10 and the SPM motor 100 using the magnet 10 are used to achieve high efficiency and low noise.
  • the magnetic flux density has a distribution close to a rectangular wave, as indicated by a broken line in FIG.
  • FIG. 6 is a graph showing an outline of the density distribution of the magnetic flux flowing from the magnet 10.
  • the peripheral portions 121 on both sides in the circumferential direction are chamfered on the second main surface 12 side of the magnet 10.
  • the side portion 121s has a different shape. That is, the 2nd main surface 12 is provided with two side parts 121s arrange
  • an acute angle ⁇ 2 formed between an arbitrary tangent L2 of the side portion 121s and the flat surface portion 110 is an acute angle ⁇ 1 formed between an arbitrary tangent L1 of the curved surface portion 120 and the flat surface portion 110.
  • the side portion 121s is formed so as to be larger. That is, in this embodiment, the thickness of the end portion of the magnet 10 is further reduced by arranging the side portion 121s as described above. In other words, the amount of change in thickness that decreases as the distance from the center of the magnet 10 increases so that the amount of change outside the center angle ⁇ 4 is larger than the amount of change in the range indicated by the center angle ⁇ 4 in FIG. In addition, the side portion 121s is used. Further, from another viewpoint, the radial distance Dc from the center point C to the curved surface portion 120 in the range indicated by the center angle ⁇ 4 in FIG. 5 is constant, whereas the side portion 121s from the center point C is constant. The distance Ds in the radial direction becomes smaller as the side surface 13 is approached.
  • the amount of change in the middle of the positive and negative peaks such as Sin 180 ° is larger than the amount of change around the peak such as Sin 90 °.
  • the end portion of the magnet 10 corresponding to the middle of the positive / negative peak of the sine wave is compared with the central portion of the magnet 10 corresponding to the periphery of the peak of the sine wave.
  • the amount of change in which the thickness is reduced is increased to approximate the sine wave characteristic. Therefore, the magnetic flux density of the magnet 10 is also closer to a sine wave.
  • the side portion 121s may be a flat surface, a curved surface, or may include a flat surface and a curved surface.
  • a flat surface it can be approximated to the vicinity of Sin 180 ° that changes linearly, and can be processed and manufactured more easily than a curved surface.
  • a small curved surface as a so-called fillet (chamfering) is further included from the side portion 121s at the more circumferential end portion as shown by the end portion 121f in FIG. 4B. Then, by rounding the end, scratches and damage due to sharp corners are prevented.
  • the width of the side portion 121s in the circumferential direction is set as follows in terms of manufacturing. That is, it is preferable to set the width of the side portion 121s so that the central angle ⁇ 4 of the curved surface portion 120 is 50 to 80% of the central angle ⁇ 3 of the second main surface 12. This is because the magnetic flux density of the magnet 10 becomes closer to a sine wave.
  • the central angle ⁇ 4 is more preferably 65 to 75% of the central angle ⁇ 3 of the second major surface 12.
  • the ratio of the length in the circumferential direction occupied by the curved surface portion 120 is in a range from half to three-quarters of the length of the second main surface 12, and the other side portions 121s are the other. What is necessary is just to comprise so that it may occupy.
  • the pair of side surfaces 13 are inclined planes so that the distance on the curved surface part 120 side is wider than the distance on the flat surface part 110 side. That is, the pair of side surfaces 13 have a shape that is inclined so as to be closer to the central direction of the magnet 10 as the plane portion 110 is approached in a plane orthogonal to the axial direction. Thereby, in addition to the side portion 121 s, the side surface 13 becomes thinner as it goes to the circumferential end portion of the magnet 10. In the present embodiment, such a side surface 13 is also used to realize a magnetic flux density that is closer to a sine wave.
  • the material of the magnet 10 is not particularly limited as long as it is a conventionally known material used for the SPM motor 100.
  • a ferrite magnet, a neodymium magnet, a samarium cobalt magnet, or the like is used as the magnet 10.
  • ferrite magnets using iron oxide as a main raw material are preferable in terms of cost. These magnets are relatively easy to break.
  • the magnet 10 and the magnet holding surface 220 of the rotor core 22 are brought into contact with each other as described above, and the magnet 10 is attached using the mold resin that becomes the rotor resin portion 23.
  • the fixed structure prevents damage to the magnet 10. That is, if the shape adopted in the present embodiment is used, what has conventionally been point contact can be made surface contact. Therefore, since the contact area of the magnet 10 increases, stable fixation can be realized.
  • FIG. 7A is a configuration diagram of the rotor 20 configured as described above.
  • FIG. 7B is a diagram showing a detailed cross-sectional structure of the rotor body 20 b including the rotor core 22 and the rotor resin portion 23.
  • FIG. 7C is a diagram showing a configuration of the outer rotor core 22m, the magnet 10, and a part of the rotor resin portion 23 in the rotor body 20b as viewed from the axial direction.
  • a shaft 21 is inserted in the center of the rotor body 20b.
  • the rotor resin portion 23 is formed by molding a predetermined portion with resin.
  • the rotor core 22 is formed with a through hole 22t.
  • the through hole 22t is a hole that penetrates the rotor core 22 in the axial direction, and has an annular shape in the radial direction. That is, the through hole 22t is disposed so as to extend the inside of the rotor core 22 as a cylindrical space from one end face to the other end face.
  • the resin of the rotor resin portion 23 is also filled in such a through hole 22t to form an internal resin portion 233 that forms a part of the rotor resin portion 23.
  • the inner resin portion 233 has a cylindrical shape, the rotor core 22 is separated into an inner rotor core 22s and an outer rotor core 22m, as can be seen from FIG. 1 and FIG. 7A.
  • the internal resin portion 233 is made of a resin material that is an electrical insulator. Therefore, in the rotor core 22, the inner rotor core 22 s and the outer rotor core 22 m are electrically insulated and separated by the inner resin portion 233. In the present embodiment, by including such a configuration, the electrical impedance of the rotor 20 is increased, and the occurrence of electrolytic corrosion in the bearing is suppressed.
  • the rotor main body 20b in which the inner rotor core 22s, the outer rotor core 22m, and the plurality of magnets 10 are fixed in a predetermined arrangement state is formed. That is, since the end plate resin portions 232 on both sides are connected to each other via the internal resin portion 233 and the inter-magnet resin portion 231, this structure allows the inner rotor core 22s, the outer rotor core 22m, and the respective magnets 10 to be located on both sides. It is fixed so as to be sandwiched between the end plate resin portions 232.
  • a protrusion 221 is formed on the outer peripheral surface of the outer rotor core 22m in order to determine the mounting position of the magnet 10.
  • the protruding portions 221 protrude further outward from the outer peripheral surface of the outer rotor core 22m, and are formed to be the same number as the magnets 10 at equal intervals in the circumferential direction.
  • the protrusions 221 are arranged so as to determine the attachment positions of the plurality of magnets 10, and the magnet holding surface 220 is formed between the adjacent protrusions 221. Thereby, the plurality of magnets 10 can be fixed to the outer peripheral surface of the rotor core 22 at equal intervals.
  • the deviation of the density distribution of the magnetic flux flowing from the individual magnets 10 toward the stator 30 is reduced, so that the efficiency of the SPM motor 100 is further improved and noise is reduced.
  • the protrusions 221 are installed between the adjacent magnet holding surfaces 220, and the magnet 10 is fixed between the adjacent protrusions 221.
  • the distance between the distal end portions of the adjacent protruding portions 221 with respect to the circumferential width Wb of the planar portion 110 of the magnet 10 is set.
  • the circumferential width Wp at is sufficiently wide.
  • the outer opening of the width Wp of the magnet holding surface 220 is set to be wide in the circumferential direction with respect to the bottom of the width Wb of the magnet 10. That is, since the outer opening is wide, the magnet 10 can be easily inserted into the magnet holding surface 220, and further, the magnet 10 can be disposed so as to be in close contact with the magnet holding surface 220 after the insertion.
  • the amount of bulge of the curved corner 922 as in the comparative example is suppressed. That is, in the punching process, punching is performed so that the grooves 222 are formed on both sides of the base of the protrusion 221. Thereby, with the formation of the groove 222, the bulge amount of the corner portion 922 in the comparative example is also reduced. As a result, even if the magnet 10 varies so as to become large, the magnet 10 does not come in contact with the vicinity of the base of the protruding portion 221, and the magnet 10 is placed on the magnet holding surface like the contact surface 229 shown in FIG. 9A. 220 can be securely attached to 220.
  • the inter-magnet resin portion of the rotor resin portion 23 on the second main surface 12 side so as to straddle the adjacent magnets 10. 231 is arranged.
  • the inter-magnet resin portion 231 is disposed so as to cover at least a part of the two side portions 121s facing each other of the adjacent magnets 10. Thereby, at least a part of the space 25 having a substantially triangular cross section formed by the two side parts 121s facing each other is filled with the resin part 231 between the magnets.
  • the number of poles is 10 (10 poles).
  • the inner diameter of the stator 30 may be distorted during the operation of the SPM motor 100, and the stator 30 may vibrate in an annular shape.
  • the ring vibration of the stator 30 can contribute to noise.
  • the cause of noise other than the ring vibration of the stator 30 is easily eliminated, and as a result, noise during operation of the SPM motor 100 is suppressed.

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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

Un noyau de stator d'un stator a une culasse annulaire et de multiples dents s'étendant radialement à partir de la périphérie interne de la culasse et ayant des parties de pointe de dent élargies de manière circonférentielle au niveau de la pointe de celles-ci, et des enroulements sont enroulés autour des dents. Un rotor est pourvu d'un noyau de rotor, d'un arbre, d'aimants et d'une partie de résine de rotor. Les multiples aimants maintenus sur le noyau de rotor sont agencés de manière circonférentielle le long de la surface périphérique externe du noyau de rotor avec un espace prédéterminé à partir des parties de pointe de dent, et la partie de résine de rotor fixe les multiples aimants au noyau de rotor. En outre, chacun des aimants est pourvu d'une première surface principale faisant face à la surface périphérique externe du noyau de rotor et d'une seconde surface principale faisant face à la partie de pointe de dent. Dans ce cas, la première surface principale comprend une partie plane, et la partie de pointe de dent ainsi que la seconde surface principale comprennent des surfaces incurvées en forme d'arc concentriques avec une surface de pôle magnétique. De plus, le noyau de rotor et les multiples aimants sont formés d'un seul tenant de telle sorte que les périphéries externes des secondes surfaces principales sont recouvertes par la partie de résine de rotor.
PCT/JP2017/028248 2016-08-29 2017-08-03 Moteur du type à aimant de surface WO2018043026A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2018537064A JP6667084B2 (ja) 2016-08-29 2017-08-03 表面磁石型モータ
CN201780052832.XA CN109661760B (zh) 2016-08-29 2017-08-03 表面磁体型马达

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-167275 2016-08-29
JP2016167275 2016-08-29

Publications (1)

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WO2018043026A1 true WO2018043026A1 (fr) 2018-03-08

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JP (1) JP6667084B2 (fr)
CN (1) CN109661760B (fr)
WO (1) WO2018043026A1 (fr)

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CN109322851A (zh) * 2018-11-27 2019-02-12 常州雷利电机科技有限公司 转子叶轮组件、包括其的水泵电机以及制造其的方法
KR20200021371A (ko) * 2018-08-20 2020-02-28 엘지이노텍 주식회사 모터
KR20200038053A (ko) * 2018-10-02 2020-04-10 엘지이노텍 주식회사 모터
WO2020100368A1 (fr) * 2018-11-15 2020-05-22 株式会社ミツバ Rotor, moteur et moteur sans balais
JP2020099121A (ja) * 2018-12-17 2020-06-25 株式会社ミツバ ロータ、モータ、及びワイパモータ
JP2020156164A (ja) * 2019-03-19 2020-09-24 三菱電機株式会社 ロータおよびロータの製造方法
JP6834064B1 (ja) * 2020-01-21 2021-02-24 三菱電機株式会社 固定子およびこれを用いた回転電機
JPWO2022107273A1 (fr) * 2020-11-19 2022-05-27
WO2023162997A1 (fr) * 2022-02-28 2023-08-31 ニデック株式会社 Rotor, et dispositif ainsi que procédé de fabrication de rotor
JP7477379B2 (ja) 2020-06-22 2024-05-01 東芝ライフスタイル株式会社 ロータ、モータおよびロータの製造方法

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WO2020241577A1 (fr) * 2019-05-27 2020-12-03 株式会社デンソー Moteur
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JP2009165349A (ja) * 2009-04-03 2009-07-23 Shin Etsu Chem Co Ltd 永久磁石回転機及び永久磁石回転機用永久磁石セグメントの製造方法
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KR20200021371A (ko) * 2018-08-20 2020-02-28 엘지이노텍 주식회사 모터
KR102627306B1 (ko) 2018-08-20 2024-01-22 엘지이노텍 주식회사 모터
KR20200038053A (ko) * 2018-10-02 2020-04-10 엘지이노텍 주식회사 모터
KR102626024B1 (ko) 2018-10-02 2024-01-18 엘지이노텍 주식회사 모터
EP3883092A4 (fr) * 2018-11-15 2022-08-24 Mitsuba Corporation Rotor, moteur et moteur sans balais
WO2020100368A1 (fr) * 2018-11-15 2020-05-22 株式会社ミツバ Rotor, moteur et moteur sans balais
JP2020088914A (ja) * 2018-11-15 2020-06-04 株式会社ミツバ ロータ、モータ及びブラシレスモータ
CN112689940A (zh) * 2018-11-15 2021-04-20 株式会社美姿把 转子、电机及无刷电机
US20210384783A1 (en) * 2018-11-15 2021-12-09 Mitsuba Corporation Rotor, motor and brushless motor
JP7169170B2 (ja) 2018-11-15 2022-11-10 株式会社ミツバ ロータ、モータ及びブラシレスモータ
CN109322851A (zh) * 2018-11-27 2019-02-12 常州雷利电机科技有限公司 转子叶轮组件、包括其的水泵电机以及制造其的方法
CN109322851B (zh) * 2018-11-27 2024-02-27 常州雷利电机科技有限公司 转子叶轮组件、包括其的水泵电机以及制造其的方法
JP2020099121A (ja) * 2018-12-17 2020-06-25 株式会社ミツバ ロータ、モータ、及びワイパモータ
JP7224218B2 (ja) 2019-03-19 2023-02-17 三菱電機株式会社 ロータおよびロータの製造方法
JP2020156164A (ja) * 2019-03-19 2020-09-24 三菱電機株式会社 ロータおよびロータの製造方法
WO2021149130A1 (fr) * 2020-01-21 2021-07-29 三菱電機株式会社 Stator et machine électrique tournante l'utilisant
JP6834064B1 (ja) * 2020-01-21 2021-02-24 三菱電機株式会社 固定子およびこれを用いた回転電機
US11996734B2 (en) 2020-01-21 2024-05-28 Mitsubishi Electric Corporation Stator and rotary electric machine using same
JP7477379B2 (ja) 2020-06-22 2024-05-01 東芝ライフスタイル株式会社 ロータ、モータおよびロータの製造方法
WO2022107273A1 (fr) * 2020-11-19 2022-05-27 三菱電機株式会社 Rotor, moteur électrique, ventilateur, dispositif de climatisation et procédé de fabrication de rotor
JPWO2022107273A1 (fr) * 2020-11-19 2022-05-27
JP7403685B2 (ja) 2020-11-19 2023-12-22 三菱電機株式会社 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法
WO2023162997A1 (fr) * 2022-02-28 2023-08-31 ニデック株式会社 Rotor, et dispositif ainsi que procédé de fabrication de rotor

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