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WO2025112797A9 - Moteur électrique à aimant permanent, système de rotor de moteur électrique et leur procédé de fabrication - Google Patents

Moteur électrique à aimant permanent, système de rotor de moteur électrique et leur procédé de fabrication Download PDF

Info

Publication number
WO2025112797A9
WO2025112797A9 PCT/CN2024/118342 CN2024118342W WO2025112797A9 WO 2025112797 A9 WO2025112797 A9 WO 2025112797A9 CN 2024118342 W CN2024118342 W CN 2024118342W WO 2025112797 A9 WO2025112797 A9 WO 2025112797A9
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
assembly
rotation center
rotor system
support rotation
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/CN2024/118342
Other languages
English (en)
Chinese (zh)
Other versions
WO2025112797A1 (fr
Inventor
倪伟
刘冠芳
原瑞泽
庞聪
贺志学
孙伟
桑尚
程铭
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.)
CRRC Yongji Electric Co Ltd
Original Assignee
CRRC Yongji Electric Co Ltd
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 CRRC Yongji Electric Co Ltd filed Critical CRRC Yongji Electric Co Ltd
Publication of WO2025112797A1 publication Critical patent/WO2025112797A1/fr
Publication of WO2025112797A9 publication Critical patent/WO2025112797A9/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having 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 distance between the first support rotation center 1b and the center of gravity 1a of the rotor assembly 1 is the first distance
  • the distance between the second support rotation center 1c and the center of gravity 1a of the rotor assembly 1 is the second distance
  • the first distance is equal to the second distance
  • the midpoint of a line connecting the first support rotation center 1 b and the second support rotation center 1 c coincides with the center of gravity 1 a of the rotor assembly 1 .
  • the center of gravity 1a of the rotor assembly 1 is on the line connecting the first support rotation center 1b and the second support rotation center 1c, so that the centrifugal force on the rotor assembly 1 during rotation is smaller, which is beneficial to improving the stability and reliability of the rotor assembly 1 during high-speed rotation.
  • the position of the center of gravity 1a of the rotor assembly 1 is not limited.
  • the midpoint of the line connecting the first support rotation center 1b and the second support rotation center 1c and the center of gravity 1a of the rotor assembly 1 can be staggered.
  • the support device 2 includes two support members 21 arranged at an interval, a first support rotation center 1 b is formed on one of the support members 21 , and a second support rotation center 1 c is formed on the other support member 21 .
  • the distance between the two support members 21 can be arranged according to actual needs.
  • the arrangement of the two support members 21 is more flexible and more convenient for maintenance.
  • the type of the support member 21 is not limited here.
  • the support member 21 is a bearing, which is arranged at intervals on both sides of the rotor assembly 1 along the axial direction.
  • the support member 21 is a supporting whole, and the rotor assembly 1 is mounted on the supporting whole.
  • the rotor assembly 1 includes a working component 10 and a permanent magnet assembly 11.
  • the working component 10 has a receiving cavity
  • the permanent magnet assembly 11 is a solid structure and is installed in the receiving cavity of the working component 10.
  • the solid structure of the permanent magnet component 11 improves the rigidity of the rotor assembly 1 and can withstand the centrifugal force caused by a higher rotation speed. Therefore, at the same rotation speed, the protective cover required for the solid structure of the permanent magnet component 11 is thinner, which reduces the difficulty of assembly.
  • the solid structure of the permanent magnet component 11 can avoid the generation of axial force on the rotor assembly 1 that causes axial eccentricity of the rotor assembly 1, reduces the axial bearing capacity of the bearing, reduces heat generation, and is beneficial to improving the stability of high-speed rotation of the rotor and the anti-demagnetization ability of the permanent magnet component 11.
  • the solid structure of the permanent magnet component 11 has a higher magnetic flux density. Therefore, at the same magnetic flux density, the solid cylindrical structure of the permanent magnet component 11 can reduce the length of the rotating shaft and the stator core, thereby improving the power density of the permanent magnet motor and increasing the first-order bending critical speed of the motor rotor system.
  • the radial cross-sectional shape of the permanent magnet assembly 11 is not limited, and may be, for example, circular or rectangular.
  • the permanent magnet assembly 11 is a solid cylindrical structure.
  • the permanent magnet assembly 11 includes a plurality of stacked disc-shaped permanent magnets 111 and an insulating layer disposed between two adjacent permanent magnets 111 .
  • the permanent magnet assembly 11 is formed by bonding multiple disc-shaped permanent magnets 111 with consistent magnetic field orientation in sections along the axial direction using insulating adhesive material. Since the permanent magnet assembly 11 is separated by insulating material inside, the eddy current loss inside the permanent magnet assembly 11 can be effectively reduced.
  • the material of the insulating layer there is no limitation on the material of the insulating layer, as long as it meets the requirements of high strength, high insulation, and high temperature resistance.
  • the permanent magnet 111 is made of rare earth samarium cobalt 2:17 permanent magnet material, bonded in sections along the axial direction, each permanent magnet 111 is 7 to 10 mm thick, the insulation layer thickness is less than or equal to 0.1 mm, and the insulation layer temperature resistance is not less than 220°C.
  • the working component 10 includes a sheath 13 and a shaft assembly 12.
  • the sheath 13 is provided with shaft assemblies 12 at both ends along the axial direction, and the sheath 13 and the shaft assembly 12 surround the working component 10 to form a receiving cavity for installing the permanent magnet assembly 11.
  • the sleeve 13 is installed with the radial size of the permanent magnet assembly 11 as a positioning reference, and the shaft assembly 12 is connected with the sleeve 13 as an axial positioning reference, so that the basic structure formed by the working component 10 has a higher installation accuracy, which is beneficial to improving the reliability of the rotor assembly 1 during high-speed rotation.
  • the sheath 13 is welded to the shaft assembly 12 .
  • the sleeve 13 and the shaft assembly 12 can be processed independently and then welded into one, which helps to reduce the difficulty of processing the sleeve 13 and the shaft assembly 12.
  • the sleeve 13 and the shaft assembly 12 are laser welded into one body.
  • the sleeve 13 and the shaft assembly 12 are easy to process, easy to assemble, and both the position tolerance and the size tolerance can be guaranteed.
  • the permanent magnet component 11 is located in the sheath 13 , and the permanent magnet component 11 and the sheath 13 are interference fit.
  • the permanent magnet assembly 11 and the sleeve 13 are interference fit, and the outer peripheral side surface of the permanent magnet assembly 11 is tightly fitted with the inner peripheral side surface of the sleeve 13, so there is no gap between the matching surfaces of the permanent magnet assembly 11 and the sleeve 13.
  • the sleeve 13 can protect the permanent magnet assembly 11 and prevent the permanent magnet assembly 11 rotating at high speed from disintegrating and failing due to centrifugal force, which is beneficial to increase the rotation speed of the rotor assembly 1.
  • the sleeve 13 can prevent the permanent magnet assembly 11 from being eccentric in the radial and axial directions when rotating at high speed, thereby reducing the maximum centrifugal force and unbalanced magnetic pull of the permanent magnet assembly 11, and improving the operating performance and stability of the permanent magnet motor.
  • the sheath 13 is welded to the shaft assembly 12 , the permanent magnet assembly 11 is located in the sheath 13 , and the permanent magnet assembly 11 and the sheath 13 are interference fit.
  • the permanent magnet assembly 11 and the sleeve 13 are interference fit, and the sleeve 13 and the shaft assembly 12 are welded into one body, which is beneficial to improving the rigidity of the rotor assembly 1, and is also beneficial to improving the assembly accuracy of the permanent magnet assembly 11, the sleeve 13 and the shaft assembly 12, so as to reduce the risk of instability of the permanent magnet motor during high-speed operation due to low assembly accuracy.
  • the shaft assembly 12 with the weight-reducing hole 121a is lighter in weight, and therefore has a smaller moment of inertia, a faster dynamic response, and a lower load-bearing requirement for the support member 21, which is beneficial to improving the start-stop life of the shaft assembly 12.
  • the exhaust hole 121b is also located on the side of the shaft body 121 close to the permanent magnet assembly 11 and is arranged radially along the shaft body 121. While further reducing the weight of the shaft body 121, when the rotor assembly 1 rotates at high speed, the gas inside the shaft body 121 that expands due to heat can be smoothly discharged to the outside.
  • the axial direction of the exhaust hole 121b does not coincide with the radial direction of the shaft assembly 12, but is inclined at a certain angle, and the inclination direction is the same as the rotation direction of the shaft assembly 12, so that the airflow is not easy to flow into the shaft assembly 12 when the shaft assembly 12 rotates at a high speed, thereby reducing the influence of the rotating airflow on the wind wear loss of the shaft assembly 12.
  • the rotation direction indicated by the reference numeral A is the rotation direction of the shaft assembly 12.
  • the locking members 15 are disposed at both ends of the rotor assembly 1 along the axial direction, and can lock the various working components 10 on the rotor assembly 1 to prevent the working components 10 from axially moving when the rotor assembly 1 rotates at high speed.
  • a positioning stop may be further provided on the outer side of one end of the shaft assembly 12 that cooperates with the locking member 15 .
  • an embodiment of the present disclosure provides a permanent magnet motor, comprising the motor rotor system and the stator core 3 as described in any of the aforementioned embodiments.
  • the length of the permanent magnet assembly 11 along the axial direction is greater than the length of the stator core 3 along the axial direction.
  • the axial length of the permanent magnet assembly 11 is greater than the axial length of the stator core 3, when the permanent magnet assembly 11 is assembled, the axial length of the stator core 3 will not exceed the axial length range of the permanent magnet assembly 11 due to assembly errors or processing size errors. Subsequently, when the permanent magnet assembly 11 rotates at high speed, no additional axial force will be generated to cause the permanent magnet assembly 11 to move axially, and the permanent magnet assembly 11 has a certain fault tolerance capability.
  • the low-pressure side impeller 161 and the high-pressure side impeller 162 are respectively arranged at the two ends of the shaft assembly 12 and locked by the locking member 15, and can rotate together with the shaft assembly 12;
  • the thrust plate 17 is arranged between the supporting device 2 and the high-pressure side impeller 162, and can rotate together with the shaft assembly 12.
  • the air enters the high-pressure side impeller 162 for secondary compression after being compressed once by the low-pressure side impeller 161. Because the axial thrusts on the impellers on both sides are inconsistent, the rotor assembly 1 tends to move to one side.
  • the thrust plate 17 plays an axial bearing role to prevent the rotor assembly 1 from deviating to one side.
  • the material of the thrust plate 17 is not limited, and may be, for example, iron, cobalt or nickel.
  • the thrust plate 17 is made of GH4169 high temperature nickel-based alloy.
  • the low-pressure side impeller 161 , the high-pressure side impeller 162 and the thrust plate 17 all have shoulders on the shaft assembly 12 to locate the positions of each component, which is beneficial to improving the positioning accuracy of the low-pressure side impeller 161 , the high-pressure side impeller 162 and the thrust plate 17 .
  • outer hexagonal square heads 1211 may be provided at both ends of the shaft body 121 in the axial direction to facilitate installation of the locking member 15 .
  • the outer hexagonal square head 1211 at the right end of the shaft body 121 is clamped with a wrench so that the rotor assembly 1 does not rotate before the locking member 15 reaches a preset locking force.
  • the outer hexagonal square head 1211 at the left end of the shaft body 121 is clamped with a wrench so that the rotor assembly 1 does not rotate before the locking member 15 reaches a preset locking force.
  • a third aspect of the embodiment of the present disclosure provides a method for manufacturing a motor rotor system.
  • the rotor assembly 1 includes a working component 10 and a permanent magnet component 11.
  • the working component 10 includes a sleeve 13 and a shaft component 12.
  • the manufacturing method includes:
  • Step S1 using the outer peripheral surface of the permanent magnet assembly 11 as a radial positioning reference, and sleeve the sheath 13 on the permanent magnet assembly 11;
  • Step S2 taking the sleeve 13 as an axial positioning reference, determining the position of the shaft assembly 12 relative to the sleeve 13 along the axial direction of the sleeve 13.
  • the manufacturing method of the motor rotor system provided in the embodiment of the present disclosure is suitable for high-speed permanent magnet motors.
  • the outer peripheral surface of the permanent magnet component 11 is used as the radial positioning reference, and the sleeve 13 is used as the axial positioning reference.
  • the rotor assembly 1 is assembled and fine-processed to ensure the dimensional tolerance and position tolerance of the rotor assembly 1, so that the distances from the center of gravity 1a of the rotor assembly 1 to the first support rotation center 1b and the second support rotation center 1c are equal, thereby improving the stability of the rotor assembly 1 during high-speed rotation.
  • the manufacturing method includes: grinding the outer peripheral surface of the permanent magnet component 11 to improve the processing accuracy of the permanent magnet component 11 .
  • step S1 the permanent magnet assembly 11 is interference-fitted into the sleeve 13 with the outer circumferential surface of the permanent magnet assembly 11 as a reference, so that there is no gap between the matching surfaces of the permanent magnet assembly 11 and the sleeve 13 .
  • the interference fit between the permanent magnet assembly 11 and the sheath 13 is 0.01 to 0.014 mm.
  • the manufacturing method includes: further grinding the shaft assembly to improve the machining accuracy of the shaft assembly.
  • step S2 the relative position of the shaft assembly 12 and the sleeve 13 in the axial direction is determined with the sleeve 13 as the axial positioning reference to ensure the assembly accuracy of the shaft assembly 12 and the sleeve 13 so that the shaft assembly 12 and the sleeve 13 are as coaxial as possible.
  • step S2 the shaft assembly 12 and the sleeve 13 are laser welded to form an integral body.
  • the fusion welding depth of the shaft assembly 12 and the sheath 13 by laser welding is 3 mm.
  • the permanent magnet assembly 11 specifically includes:
  • Step S11 a plurality of disc-shaped permanent magnets 111 are bonded together to form the cylindrical permanent magnet assembly 11 .
  • the permanent magnet assembly 11 is composed of a plurality of disk-shaped permanent magnets 111 with consistent magnetic field orientations bonded together, which is firm and reliable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

Les modes de réalisation de la présente divulgation concernent un moteur électrique à aimant permanent, un système de rotor de moteur électrique et leur procédé de fabrication, qui se rapportent au domaine technique des moteurs électriques à aimant permanent. Le système de rotor de moteur électrique comprend un dispositif de support et un ensemble rotor, le dispositif de support ayant un premier centre de rotation de support et un second centre de rotation de support qui sont espacés ; et l'ensemble rotor est relié rotatif au dispositif de support au niveau du premier centre de rotation de support et du second centre de rotation de support, respectivement, et tourne autour de la ligne reliant le premier centre de rotation de support et le second centre de rotation de support, la distance entre le premier centre de rotation de support et le centre de gravité de l'ensemble rotor est une première distance, la distance entre le second centre de rotation de support et le centre de gravité de l'ensemble rotor est une seconde distance, et la première distance est égale à la seconde distance.
PCT/CN2024/118342 2023-11-30 2024-09-11 Moteur électrique à aimant permanent, système de rotor de moteur électrique et leur procédé de fabrication Pending WO2025112797A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202311626223.4A CN118137699A (zh) 2023-11-30 2023-11-30 永磁电机、电机转子系统及其制造方法
CN202311626223.4 2023-11-30

Publications (2)

Publication Number Publication Date
WO2025112797A1 WO2025112797A1 (fr) 2025-06-05
WO2025112797A9 true WO2025112797A9 (fr) 2025-07-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2024/118342 Pending WO2025112797A1 (fr) 2023-11-30 2024-09-11 Moteur électrique à aimant permanent, système de rotor de moteur électrique et leur procédé de fabrication

Country Status (2)

Country Link
CN (1) CN118137699A (fr)
WO (1) WO2025112797A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118137699A (zh) * 2023-11-30 2024-06-04 中车永济电机有限公司 永磁电机、电机转子系统及其制造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2492422B (en) * 2011-06-06 2018-02-21 Borgwarner Inc Electric motor rotor
CN111092506A (zh) * 2020-01-07 2020-05-01 精进电动科技股份有限公司 一种永磁同步电机转子
CN113676013B (zh) * 2021-07-23 2024-06-07 苏州朗高电机有限公司 一种永磁变桨电机带制动器的电机转子动平衡校准方法
EP4195457B1 (fr) * 2021-12-10 2025-12-10 GE Energy Power Conversion Technology Ltd Système comprenant un rotor et des paliers et procédé associé
CN114614601A (zh) * 2022-04-18 2022-06-10 哈尔滨理工大学 一种轴向磁通电机转子
CN118137699A (zh) * 2023-11-30 2024-06-04 中车永济电机有限公司 永磁电机、电机转子系统及其制造方法

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CN118137699A (zh) 2024-06-04
WO2025112797A1 (fr) 2025-06-05

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