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WO2024241363A1 - Stator et machine électrique tournante équipée de celui-ci - Google Patents

Stator et machine électrique tournante équipée de celui-ci Download PDF

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Publication number
WO2024241363A1
WO2024241363A1 PCT/JP2023/018733 JP2023018733W WO2024241363A1 WO 2024241363 A1 WO2024241363 A1 WO 2024241363A1 JP 2023018733 W JP2023018733 W JP 2023018733W WO 2024241363 A1 WO2024241363 A1 WO 2024241363A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
diameter side
inner diameter
protective member
side protective
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/JP2023/018733
Other languages
English (en)
Japanese (ja)
Inventor
篤史 山本
洋介 内田
純香 乙坂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2025521585A priority Critical patent/JPWO2024241363A1/ja
Priority to PCT/JP2023/018733 priority patent/WO2024241363A1/fr
Publication of WO2024241363A1 publication Critical patent/WO2024241363A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors

Definitions

  • This application relates to a stator and a rotating electric machine equipped with the stator.
  • magnetic-geared rotating electric machines are used as generators that convert the kinetic energy obtained from turbines into electrical energy.
  • a magnetic-geared rotating electric machine is composed of three cylindrical sections arranged coaxially. For example, when a magnetic-geared rotating electric machine is used as a generator, the inner cylindrical section becomes a high-speed rotor equipped with permanent magnets, the middle cylindrical section becomes a low-speed rotor equipped with magnetic pole pieces, and the outer cylindrical section becomes a stator equipped with a stator magnet and stator coil.
  • stator When the magnetic flux generated by the rotor interlinks with the stator magnet, eddy currents are generated in the stator magnet. These eddy currents increase the temperature of the stator magnet, and the magnetic force of the stator magnet decreases.
  • a stator that can suppress the eddy currents generated in the stator magnet, a stator has been disclosed in which the stator magnet is split into two along the polarity at the circumferential center of the stator slot, and a magnetic chip portion is provided between the stator coil and the stator magnet (see, for example, Patent Document 1). In this stator, by splitting the stator magnet into two, eddy current loss generated in the stator magnet can be suppressed.
  • stator of a magnetic-geared rotating electric machine the magnetic force acting on the stator magnet changes periodically due to the rotation of the high-speed and low-speed rotors and the flow of current through the stator coil. As a result, the entire stator, including the stator magnet, is excited and vibrates. In particular, in conventional rotors, the two split stator magnets generate magnetic forces in directions that repel each other.
  • the stator magnet is fixed to the wall surface of the stator slot via a resin material using adhesive or the like.
  • the position of the stator magnet may change due to factors such as a decrease in adhesive strength caused by aging of the adhesive, differences in thermal expansion between the stator magnet and the adhesive caused by temperature changes, and vibration.
  • conventional stators have a problem with low reliability in fixing the stator magnet.
  • This application has been made to solve the above-mentioned problems, and aims to provide a rotor with a highly reliable fixed stator magnet.
  • the stator of the present application has a stator core having a circular ring-shaped back core and multiple teeth spaced apart on the inner diameter side of the back core, a stator coil arranged on the outer diameter side of a slot formed between the multiple teeth, and a stator magnet arranged on the inner diameter side of the slot at a distance from the stator coil.
  • a pair of tip portions protruding in the circumferential direction from the side walls of the opposing teeth are formed between the stator coil and the stator magnet, an outer diameter side protective member is arranged between the pair of tip portions and the stator coil, the circumferential width of the stator magnet decreases toward the inner diameter side, an inner diameter side protective member is arranged between the stator magnet and the teeth, and the outer diameter side protective member and the inner diameter side protective member are fastened by connecting plates at both axial ends.
  • an outer diameter side protective member is disposed between the pair of tip portions and the stator coil, the circumferential width of the stator magnet decreases toward the inner diameter side, and an inner diameter side protective member is disposed between the stator magnet and the teeth.
  • the outer diameter side protective member and the inner diameter side protective member are fastened by connecting plates at both axial ends, so that the stator magnet can be fixed with high reliability.
  • FIG. 1 is a perspective view of a rotating electric machine according to a first embodiment
  • 2 is a perspective view of a stator, a low-speed rotor, and a high-speed rotor according to the first embodiment.
  • FIG. FIG. 2 is an enlarged cross-sectional view of the stator according to the first embodiment.
  • FIG. 2 is an enlarged perspective view of the stator according to the first embodiment.
  • FIG. 2 is a side view of the stator according to the first embodiment.
  • FIG. 11 is an enlarged cross-sectional view of a stator according to a second embodiment.
  • FIG. 11 is an enlarged perspective view of a stator according to a second embodiment.
  • FIG. 11 is a side view of a stator according to a third embodiment.
  • FIG. 1 is a perspective view of a rotating electric machine according to a first embodiment.
  • a rotating electric machine 10 includes a cylindrical frame 1, a stator 2, a low-speed rotor 3, a high-speed rotor 4, and a rotating shaft 5.
  • the stator 2, the low-speed rotor 3, and the high-speed rotor 4 are arranged coaxially with respect to the rotating shaft 5.
  • the stator 2 is fixed to the frame 1.
  • the high-speed rotor 4 and the rotating shaft 5 are fixed.
  • the rotating shaft 5 is rotatably supported by the frame 1 via a bearing (not shown).
  • the low-speed rotor 3 is rotatably supported by the rotating shaft 5 via a bearing provided on a low-speed rotor end plate 31.
  • a direction parallel to the rotating shaft 5 is referred to as an axial direction
  • a direction perpendicular to the rotating shaft 5 is referred to as a radial direction
  • a direction rotating around the rotating shaft 5 is referred to as a circumferential direction.
  • a direction away from the rotating shaft 5 is referred to as an outer diameter side
  • an opposite direction is referred to as an inner diameter side.
  • the low-speed rotor 3 rotates due to the rotation of the wind turbine, and the high-speed rotor 4 rotates at an increased speed, causing an induced current to flow in the stator coil of the stator 2.
  • the high-speed rotor 4 is fixed to the rotating shaft 5, but it does not necessarily have to be fixed to the rotating shaft 5.
  • the high-speed rotor 4 may be rotatably supported on the rotating shaft 5 via a bearing.
  • FIG. 2 is a perspective view of the stator, low-speed rotor, and high-speed rotor according to this embodiment.
  • FIG. 2 shows the stator 2, low-speed rotor 3, and high-speed rotor 4 according to this embodiment, separated in the axial direction.
  • the stator 2 includes a stator core 21 with multiple slots in the circumferential direction, and stator coils 22 and stator magnets 23 arranged in the slots.
  • the stator 2 is fixed to the frame 1 on the inner diameter side of the frame 1.
  • the low-speed rotor 3 has a cylindrical shape arranged on the inner diameter side of the stator 2 with a gap therebetween.
  • the low-speed rotor 3 is composed of multiple magnetic pole pieces 32 and spacers 33 arranged alternately in the circumferential direction.
  • the high-speed rotor 4 is arranged on the inner diameter side of the low-speed rotor 3 with a gap therebetween.
  • the high-speed rotor 4 includes a cylindrical high-speed rotor core 41 and high-speed rotor magnets 42 arranged in a line in the circumferential direction on the outer circumferential surface of the high-speed rotor core 41. Note that the rotating shaft 5 fixed to the high-speed rotor core 41 is omitted in FIG. 2.
  • the stator core 21 of the stator 2, the high-speed rotor core 41 of the high-speed rotor 4, and the magnetic pole pieces 32 of the low-speed rotor 3 are made of, for example, laminated electromagnetic steel plates.
  • the spacer 33 of the low-speed rotor 3 is made of a non-magnetic material such as stainless steel or resin.
  • the stator magnet 23 of the stator 2 and the high-speed rotor magnet 42 of the high-speed rotor 4 are permanent magnets.
  • the stator coil 22 of the stator 2 is made of insulatingly coated conductor wires made of copper, copper alloy, aluminum, or the like.
  • FIG. 3 is an enlarged cross-sectional view of the stator according to this embodiment.
  • FIG. 3 is a cross-sectional view perpendicular to the axial direction, showing an enlarged view of one slot portion.
  • the stator 2 according to this embodiment has a stator core 21, a stator coil 22, a stator magnet 23, and a protective member 24.
  • the stator core 21 is composed of a circular ring-shaped back core 21a and multiple teeth 21b arranged at intervals on the inner diameter side of the back core 21a. Slots 25 are formed between the multiple teeth 21b.
  • the stator coil 22 is wound around the teeth 21b using these slots 25.
  • the stator coil 22 is arranged on the outer diameter side of the slots 25.
  • the stator magnet 23 is disposed on the inner diameter side of the slot 25, spaced apart from the stator coil 22.
  • the circumferential width of the stator magnet 23 decreases towards the inner diameter side.
  • a pair of tip portions 26 protruding circumferentially from the teeth 21b are provided in the slot 25 between the stator coil 22 and the stator magnet 23.
  • the tip portions 26 are disposed on the inner diameter side of the stator coil 22 with a gap between them.
  • the tip portions 26 facing each other within the slot 25 are spaced apart.
  • the tip portions 26 are made of the same magnetic material as the teeth 21b.
  • the protective member 24 is composed of an inner diameter side protective member 24a provided between the stator magnet 23 and the teeth 21b, and an outer diameter side protective member 24b provided between the stator coil 22 and the tip portion 26.
  • the inner diameter side protective member 24a is arranged so as to fill the slot 25 between the stator magnet 23 and the teeth 21b.
  • the outer diameter side protective member 24b is arranged so as to straddle the opposing tip portion 26 within the slot 25.
  • the protective member 24 is composed of a non-magnetic material. Specifically, the protective member 24 is composed of, for example, resin, stainless steel, etc.
  • FIG. 4 is an enlarged perspective view of the stator according to this embodiment.
  • the inner diameter side protective member 24a and the outer diameter side protective member 24b are fastened by connecting plates 27 at both axial ends.
  • FIG. 5 is a side view of the stator according to this embodiment.
  • FIG. 5 is a side view of the stator as viewed from the inner diameter side.
  • the two inner diameter side protective members 24a arranged on both circumferential sides of the stator magnet 23 are fastened by connecting plates 27 at both axial ends.
  • the two inner diameter side protective members 24a and the connecting plates 27 are fastened by, for example, connecting bolts 27a.
  • the connecting plates 27 are made of the same non-magnetic material as the protective members 24.
  • the stator magnet 23 is fixed by the tip portion 26 and the inner diameter side protective member 24a.
  • the radial position of the stator magnet 23 is fixed by the tip portion 26 and the inner diameter side protective member 24a, and the circumferential position is fixed by the inner diameter side protective member 24a.
  • the inner diameter side protective member 24a and the outer diameter side protective member 24b are fastened by connecting plates 27 at both axial ends, the axial position of the stator magnet 23 is fixed. That is, in the stator of this embodiment, since the radial, circumferential and axial positions of the stator magnet 23 are fixed by the tip portion 26 and the protective member 24, the stator magnet can be fixed with high reliability.
  • Fig. 6 is an enlarged cross-sectional view of a stator according to embodiment 2.
  • Fig. 6 is a cross-sectional view in a direction perpendicular to the axial direction, and shows an enlarged view of one slot portion.
  • the stator 2 of this embodiment has a stator core 21, a stator coil 22, a stator magnet 23, and a protective member 24.
  • the stator core 21 is composed of a circular ring-shaped back core 21a and multiple teeth 21b arranged at intervals on the inner diameter side of the back core 21a. Slots 25 are formed between the multiple teeth 21b.
  • the stator coil 22 is wound around the teeth 21b using these slots 25.
  • the stator coil 22 is arranged on the outer diameter side of the slots 25.
  • the stator magnets 23 are arranged on the inner diameter side of the slots 25, spaced apart from the stator coils 22.
  • the circumferential width of the stator magnets 23 decreases towards the inner diameter side.
  • the slots 25 between the stator coils 22 and the stator magnets 23 are provided with chip portions 26 that protrude circumferentially from the teeth 21b.
  • the chip portions 26 are arranged on the inner diameter side of the stator coils 22 with a gap between them.
  • the chip portions 26 facing each other within the slots 25 are spaced apart.
  • the chip portions 26 are made of the same magnetic material as the teeth 21b.
  • the stator magnet 23 in this embodiment is split in two at the center. That is, the stator magnet 23 in this embodiment is composed of split stator magnet 23a and split stator magnet 23b. The distance between split stator magnet 23a and split stator magnet 23b increases toward the outer diameter side.
  • the protective member 24 is composed of an inner diameter side protective member 24a provided between the split stator magnets 23a, 23b and the teeth 21b, and an outer diameter side protective member 24b provided between the stator coil 22 and the tip portion 26.
  • the inner diameter side protective member 24a is arranged so as to fill the slot 25 between the split stator magnets 23a, 23b and the teeth 21b.
  • the outer diameter side protective member 24b is arranged so as to straddle the opposing tip portion 26 within the slot 25. Furthermore, the outer diameter side protective member 24b extends between the split stator magnets 23a and 23b.
  • Figure 7 is an enlarged perspective view of the stator according to this embodiment.
  • the inner diameter side protective member 24a and the outer diameter side protective member 24b are fastened to each other by connecting plates 27 at both ends in the axial direction.
  • the inner diameter side protective member 24a and the outer diameter side protective member 24b are fastened to the connecting plates 27 by, for example, connecting bolts 27a.
  • the split stator magnets 23a, 23b are fixed by the tip portion 26, the inner diameter side protective member 24a, and the outer diameter side protective member 24b.
  • the split stator magnets 23a, 23b have their radial positions fixed by the tip portion 26, the inner diameter side protective member 24a, and the outer diameter side protective member 24b, and their circumferential positions fixed by the inner diameter side protective member 24a and the outer diameter side protective member 24b.
  • the inner diameter side protective member 24a and the outer diameter side protective member 24b are fastened by the connecting plate 27 at both ends in the axial direction, the split stator magnets 23a, 23b are fixed in their axial positions. That is, in the stator of this embodiment, the split stator magnets 23a, 23b have their radial, circumferential, and axial positions fixed by the tip portion 26 and the protective member 24, so the stator magnets can be fixed with high reliability.
  • stator magnet 23 is divided into two, which makes it possible to suppress eddy current loss that occurs in the stator magnet.
  • the protective member and the connecting plate are made of the same non-magnetic material. From the viewpoint of eddy current loss, it is preferable that the protective member and the connecting plate are non-magnetic and insulating. An example of a material having non-magnetic and insulating properties is resin. However, from the viewpoint of the strength of the protective member, non-magnetic steel having conductivity such as stainless steel may be used as the protective member. In the stator according to the third embodiment, non-magnetic steel is used as the protective member and the connecting plate.
  • FIG. 8 is a side view of the stator in this embodiment.
  • Figure 8 is a side view of the stator as viewed from the inner diameter side.
  • two inner diameter side protective members 24a arranged on both sides in the circumferential direction of the stator magnet 23 are fastened by connecting plates 27 at both ends in the axial direction.
  • the two inner diameter side protective members 24a and the connecting plate 27 are fastened by, for example, connecting bolts 27a.
  • the connecting plate 27 is made of the same non-magnetic steel as the protective member 24.
  • a loop circuit is formed by the two inner diameter side protective members 24a and the connecting plate 27.
  • an insulating member 28 is inserted between the connecting plate 27 at one end and the two inner diameter side protective members 24a.
  • the connecting bolt 27a at the location where the insulating member 28 is inserted is made of an insulating material. Note that if the connecting bolt 27a is made of a conductive material, an insulating washer is inserted between the connecting bolt 27a and the connecting plate 27 to prevent direct contact between the connecting bolt 27a and the connecting plate 27.
  • an insulating member is inserted between the connecting plate at one end and the two inner diameter side protective members to prevent the formation of a loop circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un stator dans lequel un aimant de stator est fixé avec une fiabilité élevée.　Le stator (2) comprend : un noyau de stator (21) ayant un noyau arrière (21a) et une pluralité de dents (21b) ; une bobine de stator (22) disposée sur le côté de diamètre externe d'une fente (25) formée entre la pluralité de dents ; et un aimant de stator (23) disposé sur le côté de diamètre interne. Une paire de pointes (26) est formée entre la bobine de stator et l'aimant de stator, un élément de protection côté diamètre externe (24b) est disposé entre la paire de pointes et la bobine de stator, un élément de protection côté diamètre interne (24a) est disposé entre l'aimant de stator et les dents, et l'élément de protection côté diamètre externe et l'élément de protection côté diamètre interne sont fixés par des plaques d'assemblage aux deux extrémités dans la direction axiale.
PCT/JP2023/018733 2023-05-19 2023-05-19 Stator et machine électrique tournante équipée de celui-ci Pending WO2024241363A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2025521585A JPWO2024241363A1 (fr) 2023-05-19 2023-05-19
PCT/JP2023/018733 WO2024241363A1 (fr) 2023-05-19 2023-05-19 Stator et machine électrique tournante équipée de celui-ci

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/018733 WO2024241363A1 (fr) 2023-05-19 2023-05-19 Stator et machine électrique tournante équipée de celui-ci

Publications (1)

Publication Number Publication Date
WO2024241363A1 true WO2024241363A1 (fr) 2024-11-28

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ID=93589638

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/018733 Pending WO2024241363A1 (fr) 2023-05-19 2023-05-19 Stator et machine électrique tournante équipée de celui-ci

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Country Link
JP (1) JPWO2024241363A1 (fr)
WO (1) WO2024241363A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016135014A (ja) * 2015-01-20 2016-07-25 株式会社Ihi 磁気波動歯車装置
US20200212773A1 (en) * 2016-12-23 2020-07-02 Korea Electrotechnology Research Institute Permanent magnet electrical machine for reducing detent force
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
WO2021149473A1 (fr) * 2020-01-24 2021-07-29 三菱重工業株式会社 Machine électrique rotative à engrenage magnétique
WO2022049750A1 (fr) * 2020-09-07 2022-03-10 三菱電機株式会社 Machine électrique tournante et procédé de fabrication de rotor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016135014A (ja) * 2015-01-20 2016-07-25 株式会社Ihi 磁気波動歯車装置
US20200212773A1 (en) * 2016-12-23 2020-07-02 Korea Electrotechnology Research Institute Permanent magnet electrical machine for reducing detent force
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
WO2021149473A1 (fr) * 2020-01-24 2021-07-29 三菱重工業株式会社 Machine électrique rotative à engrenage magnétique
WO2022049750A1 (fr) * 2020-09-07 2022-03-10 三菱電機株式会社 Machine électrique tournante et procédé de fabrication de rotor

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JPWO2024241363A1 (fr) 2024-11-28

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