WO2025201122A1 - Structure d'acier magnétique, rotor de moteur, moteur et véhicule - Google Patents

Structure d'acier magnétique, rotor de moteur, moteur et véhicule

Info

Publication number
WO2025201122A1
WO2025201122A1 PCT/CN2025/083269 CN2025083269W WO2025201122A1 WO 2025201122 A1 WO2025201122 A1 WO 2025201122A1 CN 2025083269 W CN2025083269 W CN 2025083269W WO 2025201122 A1 WO2025201122 A1 WO 2025201122A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic steel
shaped structure
tip
angle
motor
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/CN2025/083269
Other languages
English (en)
Chinese (zh)
Inventor
毛佳慧
关天宇
孙红超
谢希
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.)
Shanghai Lixiang Automobile Co Ltd
Original Assignee
Shanghai Lixiang Automobile 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 Shanghai Lixiang Automobile Co Ltd filed Critical Shanghai Lixiang Automobile Co Ltd
Publication of WO2025201122A1 publication Critical patent/WO2025201122A1/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
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present disclosure relates to the field of vehicle technology, and in particular to a magnetic steel structure, a motor rotor, a motor, and a vehicle.
  • the main means to improve the motor's anti-demagnetization ability include: improving the motor's cooling capacity, reducing the operating temperature of the magnet, increasing the magnet's coercive force, and changing the rotor topology through electromagnetic design.
  • the above methods have relatively limited effects and greatly increase the cost and time cycle. How to further improve and optimize the motor's anti-demagnetization ability has become an urgent problem to be solved.
  • the embodiments of the present disclosure provide a magnetic steel structure, a motor rotor, a motor and a vehicle.
  • an embodiment of the present disclosure provides a magnetic steel structure, wherein the magnetic steel structure is arranged on a motor rotor; the magnetic steel structure includes a first magnetic steel and a second magnetic steel arranged in a V-shaped structure;
  • the first magnetic steel and/or the second magnetic steel is formed by splicing four relatively insulated magnetic steel segments, and adjacent magnetic steel segments are made of different materials.
  • the widths of each magnetic steel segment are equal.
  • the widths of each magnetic steel segment are different.
  • the width corresponding to each magnetic steel segment decreases successively.
  • the coercive force corresponding to each magnetic steel segment decreases successively.
  • the residual magnetism corresponding to each magnetic steel segment increases successively.
  • the magnetic energy product corresponding to each magnetic steel segment decreases successively.
  • the present application further provides a motor rotor, comprising the magnetic steel structure as described in any one of the first aspects.
  • the present application further provides a motor, comprising the motor rotor as described in the second aspect.
  • the present application also provides a vehicle, comprising the motor as described in the third aspect.
  • the present application provides a magnetic steel structure, a motor rotor, a motor, and a vehicle.
  • the magnetic steel structure is disposed on the motor rotor;
  • the magnetic steel structure includes a first magnetic steel and a second magnetic steel arranged in a V-shaped structure; in a direction away from the tip of the angle of the V-shaped structure, the first magnetic steel and/or the second magnetic steel are composed of four relatively insulated magnetic steel segments, with adjacent magnetic steel segments being made of different materials.
  • the present application reduces eddy current losses by configuring the first and second magnetic steels of the V-shaped structure to be composed of four magnetic steel segments. Furthermore, by configuring each segment to be made of a different material, the purpose of both increasing residual magnetism and reducing costs can be achieved.
  • FIG1 is a schematic diagram of a magnetic steel structure provided in an embodiment of the present application.
  • FIG2 is a schematic diagram of another magnetic steel structure provided in an embodiment of the present application.
  • FIG3 is a schematic diagram of another magnetic steel structure provided in an embodiment of the present application.
  • FIG4 is a graph showing eddy current loss of a magnetic steel with different numbers of segments provided by an embodiment of the present application.
  • FIG7 is a schematic diagram of another magnetic steel structure provided in an embodiment of the present application.
  • the present invention provides a magnetic steel structure, which is arranged on a motor rotor.
  • Figure 1 is a schematic diagram of a magnetic steel structure provided in an embodiment of the present invention.
  • the magnetic steel structure includes a first magnetic steel 100 and a second magnetic steel 200 arranged in a V-shaped structure.
  • the first magnetic steel 100 and/or the second magnetic steel 200 is composed of four relatively insulated magnetic steel segments 101 , and adjacent magnetic steel segments 101 are made of different materials.
  • the embodiment of the present application protects a magnetic steel structure
  • the magnetic steel structure is arranged on the motor rotor, and corresponding technical problems arise when the motor is working. Therefore, in the process of describing the technical solution and technical effects, the embodiment of the present application is inevitably described as a motor..., but this does not affect the fact that the protected subject of this embodiment is a magnetic steel structure.
  • the first magnetic steel 100 or the second magnetic steel 200 is not deliberately limited.
  • the embodiment of the present application directly replaces the first magnetic steel 100 and the second magnetic steel 200 with magnetic steel, that is, the magnetic steel described in the embodiment of the present application can refer to at least one of the first magnetic steel 100 and the second magnetic steel 200.
  • eddy current loss Pe ⁇ t 2- ⁇ V where the heat loss generated by the magnet is eddy current loss, which refers to the rotating current generated inside the magnet when the magnet is in an alternating magnetic field.
  • This current is eddy current, and when it passes through the magnet, it will inevitably encounter resistance (the magnet is a conductor), thereby generating heat, and thus energy is converted into heat energy, which constitutes eddy current loss.
  • Pe Ke ⁇ f 2 ⁇ B 2 ⁇ t 2 ⁇ V.
  • the embodiments of the present application can improve the anti-demagnetization capability of the motor and reduce costs through the above-mentioned solution.
  • the eddy current loss is 1/4 of that in the case of no segmentation, that is, a reduction of 75%.
  • the eddy current loss is 1/9 of that in the case of no segmentation, that is, a reduction of about 89%.
  • the eddy current loss is 1/16 of that in the case of no segmentation, that is, a reduction of 93.75%.
  • the eddy current loss is 1/25, that is, a reduction of 96%.
  • the width of the outermost magnetic steel segment 101 may be W1
  • the width of the inner magnetic steel segment 101 may be W2 , where W1 ⁇ W2 .
  • the coercive force corresponding to each magnetic steel segment 101 decreases successively along the direction from the center of the magnetic steel segment 101 toward the tip of the angle of the V-shaped structure, and/or along the direction from the center of the magnetic steel segment 101 away from the tip of the angle of the V-shaped structure.
  • the residual magnetism corresponding to each magnetic steel segment 101 increases sequentially along the direction from the center of the magnetic steel segment 101 toward the tip of the angle of the V-shaped structure, and/or along the direction from the center of the magnetic steel segment 101 away from the tip of the angle of the V-shaped structure.
  • the magnetic energy product corresponding to each magnetic steel segment 101 decreases successively along the direction from the center of the magnetic steel segment 101 toward the tip of the angle of the V-shaped structure, and/or along the direction from the center of the magnetic steel segment 101 away from the tip of the angle of the V-shaped structure.
  • the embodiment of this application verifies the structure of the magnetic steel under equal segmentation. Take the electromagnetic design scheme of an 8-pole 48-slot motor as an example. By dividing the magnetic steel into 4 equal segments along the width direction of the magnetic steel using a double V rotor topology, insulating it, and then bonding it together, the general rules are summarized and the effects of segmentation and non-segmentation on the eddy current loss of the magnetic steel are compared.
  • Figure 3 is a schematic diagram of another magnetic steel structure provided in the embodiment of this application.
  • Figure a (Scheme 1) in Figure 3 is not segmented.
  • Figure b (Scheme 2), c (Scheme 3) and d (Scheme 4) in Figure 3 the large and small magnets of the double V-rotor topology are respectively divided into 2 segments, 3 segments and 4 segments along the width direction of the magnets; the eddy current losses of the magnets of the three segmentation methods under a certain characteristic working condition of the motor are calculated respectively through finite element simulation. The calculation results are shown in Table 1 and Figure 4.
  • Figure 4 is a graph of the eddy current loss of the magnets of different sizes with different numbers of segments provided in an embodiment of the present application.
  • the simulated eddy current loss of the magnetic steel decreases with the increase of the number of magnetic steel segments, and the four-segment equal distribution has obvious benefits, exceeding 60% for large magnetic steel and 80% for small magnetic steel. Moreover, the slope becomes slower and the benefits decrease with the increase of the number of segments.
  • the size of the magnetic steel of the automotive permanent magnet synchronous motor is generally 10 to 30 mm in width and 2 to 6 mm in thickness
  • the size of the block magnetic steel in the width direction is not easy to be smaller than the thickness of the magnetic steel, so this case chooses to divide the magnetic steel into 4 sections in the width direction.
  • the coercive force of the four magnetic steel segments 101 in the width direction is adjusted based on the above magnetic steel segmentation scheme, and the effects of different coercive force combinations on the anti-demagnetization performance of the rotor are compared.
  • Solution 3 shown in Table 2, better addresses this problem.
  • This approach improves the coercivity of the segments at both ends of the magnet—here, from 45UH to 45EH—and replaces the material of the central, non-demagnetizing area of the magnet with 45SH.
  • Finite element simulation and demagnetization verification revealed that the demagnetization area of the small magnets qualified at 10%, and the overall torque reduction rate qualified at 0.08%.
  • Solution 3 utilizes lower material performance to meet the same demagnetization requirements, enhancing product competitiveness.
  • the performance limit of the magnetic material is fully utilized to pursue higher power density and torque density.
  • the remanent magnetism Br of the 45EH magnetic material used at both ends of the large and small magnets in Scheme 1 at 150°C is 1.157T
  • the remanent magnetism Br of the 45SH magnetic material used in the middle is 1.157T
  • the remanent magnetism Br of the 45EH magnetic material used at both ends of Scheme 2 and the 53SH magnetic material used in the middle is 1.234T.
  • This case combines two traditional methods, and improves the structure and materials through finite element simulation design optimization. It reduces eddy current loss by evenly dividing the large and small magnets into four sections, improves motor efficiency and appropriately enhances anti-demagnetization ability.
  • high coercivity and low remanence materials are used at the ends of the magnet corners where demagnetization is strictly required to pursue high anti-demagnetization ability.
  • low coercivity and high remanence materials minimum magnetic energy product
  • FIG5 is a graph showing a change in the demagnetization area along with the coercive force of the magnet provided in an embodiment of the present application. As shown in FIG5 , as the coercive force decreases, the demagnetization area increases.
  • FIG6 is a demagnetization cloud diagram provided in an embodiment of the present application. As can be seen from FIG6 , as the coercive force decreases, the demagnetization area increases from the two ends to the middle along the width direction of the magnet. When the coercive force approaches the critical point of -640Ka/m, the demagnetization area increases sharply.
  • FIG7 is another schematic diagram of the magnet structure provided in an embodiment of the present application.
  • the width of the magnet segment 101 gradually increases from the edge of the magnet to the center of the magnet, that is, W3 ⁇ W4 ⁇ W5 ⁇ W6 ⁇ W7. From the center of the magnet to the two ends, the coercive force of the magnet is increased in steps. The closer to the two ends of the magnet, the larger the coercive force value required to ensure that the magnet in each section does not demagnetize.
  • This segmentation scheme requires the use of a DOE experiment of simulated demagnetization to calculate the demagnetization range of magnets with different coercive forces and the distance between the demagnetization boundary and the two ends of the magnet.
  • the calculation results of unequal segmented magnets are shown in Scheme 7 in Figure 6.
  • the demagnetization area is the same as that of Scheme 1 in Figure 6 using high coercive force magnets.
  • the same anti-demagnetization ability of high coercive force magnets is achieved at the lowest magnet material cost. In the actual production process, process manufacturability must also be considered. At the same time, reducing the number of materials can reduce the number of segments and select a more appropriate number of segments.
  • An embodiment of the present application further provides a motor rotor, which includes a magnetic steel structure as described in any one of the above-mentioned magnetic steel structure embodiments.
  • the motor rotor provided in the embodiment of the present application has at least some of the same technical features as the above-mentioned magnetic steel structure embodiment, and therefore can also solve the same technical problems as the above-mentioned magnetic steel structure and achieve the same technical effects, which will not be repeated here.
  • An embodiment of the present application further provides a motor, which includes the motor rotor in the above-mentioned motor rotor embodiment.
  • the motor provided in the embodiment of the present application has at least some of the same technical features as the above-mentioned motor rotor embodiment, and therefore can also solve the same technical problems as the above-mentioned motor rotor embodiment and achieve the same technical effects, which will not be repeated here.
  • An embodiment of the present application also provides a vehicle, which includes the motor in the above motor embodiment.
  • the vehicle provided in the embodiment of the present application has at least some of the same technical features as the above-mentioned motor embodiment, and therefore can also solve the same technical problems as the above-mentioned motor embodiment and achieve the same technical effects, which will not be repeated here.

Landscapes

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

Abstract

Des modes de réalisation de la présente divulgation concernent une structure d'acier magnétique, un rotor de moteur, un moteur et un véhicule. La structure d'acier magnétique est disposée sur un rotor de moteur ; la structure d'acier magnétique comprend un premier acier magnétique et un second acier magnétique qui sont agencés dans une structure en forme de V ; dans une direction s'éloignant de la pointe de l'angle inclus de la structure en forme de V, le premier acier magnétique et/ou le second acier magnétique sont formés par assemblage de quatre segments d'acier magnétique relativement isolés ; et les matériaux de segments d'acier magnétique adjacents sont différents. Dans la présente divulgation, sur la base de la solution, le premier acier magnétique et le second acier magnétique qui sont agencés dans la structure en forme de V sont chacun configurés pour être formés par assemblage de quatre segments d'acier magnétique, ce qui permet de réduire la perte de courant de Foucault ; et en outre, les matériaux des segments sont déterminés comme étant différents, ce qui permet d'améliorer la rémanence et de réduire les coûts.
PCT/CN2025/083269 2024-03-26 2025-03-18 Structure d'acier magnétique, rotor de moteur, moteur et véhicule Pending WO2025201122A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202420601163.4U CN222234511U (zh) 2024-03-26 2024-03-26 磁钢结构、电机转子、电机及车辆
CN202420601163.4 2024-03-26

Publications (1)

Publication Number Publication Date
WO2025201122A1 true WO2025201122A1 (fr) 2025-10-02

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ID=93919621

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2025/083269 Pending WO2025201122A1 (fr) 2024-03-26 2025-03-18 Structure d'acier magnétique, rotor de moteur, moteur et véhicule

Country Status (2)

Country Link
CN (1) CN222234511U (fr)
WO (1) WO2025201122A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN222234511U (zh) * 2024-03-26 2024-12-24 上海理想汽车科技有限公司 磁钢结构、电机转子、电机及车辆

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1237253A2 (fr) * 2001-03-02 2002-09-04 Nissan Motor Co., Ltd. Generateur-Moteur
CN106329774A (zh) * 2016-09-14 2017-01-11 南京航空航天大学 一种电动汽车驱动用多层分段内置式永磁同步电机转子
US20220006337A1 (en) * 2020-07-02 2022-01-06 Mando Corporation Electric motor having rotor assembly with segmented permanent magnet
US20230163647A1 (en) * 2020-07-23 2023-05-25 Huawei Digital Power Technologies Co., Ltd. Motor rotor and motor
CN220527751U (zh) * 2023-07-27 2024-02-23 联合汽车电子有限公司 一种磁钢组件、转子及电机
CN222234511U (zh) * 2024-03-26 2024-12-24 上海理想汽车科技有限公司 磁钢结构、电机转子、电机及车辆

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1237253A2 (fr) * 2001-03-02 2002-09-04 Nissan Motor Co., Ltd. Generateur-Moteur
CN106329774A (zh) * 2016-09-14 2017-01-11 南京航空航天大学 一种电动汽车驱动用多层分段内置式永磁同步电机转子
US20220006337A1 (en) * 2020-07-02 2022-01-06 Mando Corporation Electric motor having rotor assembly with segmented permanent magnet
US20230163647A1 (en) * 2020-07-23 2023-05-25 Huawei Digital Power Technologies Co., Ltd. Motor rotor and motor
CN220527751U (zh) * 2023-07-27 2024-02-23 联合汽车电子有限公司 一种磁钢组件、转子及电机
CN222234511U (zh) * 2024-03-26 2024-12-24 上海理想汽车科技有限公司 磁钢结构、电机转子、电机及车辆

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