Rotor assembly, motor and vehicle

Abstract

The invention provides a rotor assembly, a motor and a vehicle, and the rotor assembly comprises a rotor main body, the material of the rotor main body is an amorphous material, the rotor main body is provided with a plurality of fan-shaped regions distributed along the circumferential direction of the rotor main body, and each fan-shaped region is provided with a magnetic pole center line along the axial direction of the rotor main body; each fan-shaped area is provided with one magnetic piece set, each magnetic piece set can generate a magnetic field in the fan-shaped area where the magnetic piece set is located, and the magnetic fields are asymmetrical along the center line of the magnetic pole. According to the rotor assembly, the motor and the vehicle provided by the invention, the technical problem of output performance reduction caused by power output saturation can be solved to a certain extent.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a rotor assembly, a motor, and a vehicle. Background Art

[0002] In the prior art, most of the rotor magnetic circuit structures of new energy vehicle motors are in a double V shape, and the magnetic circuit structure is relatively single, making it difficult to further improve the performance. At the same time, when the load of the motor exceeds its output capacity, the phenomenon of power output saturation will occur, resulting in a decline in the output performance of the motor. Summary of the Invention

[0003] The embodiments of this application provide a rotor assembly, a motor, and a vehicle that can, to a certain extent, solve the technical problem of the decline in output performance caused by power output saturation.

[0004] To achieve the above object, in a first aspect, this application provides a rotor assembly, which includes

[0005] a rotor main body made of amorphous material, the rotor main body having a plurality of sector regions distributed along its circumferential direction, and each sector region having a magnetic pole center line along the axial direction of the rotor main body; and a plurality of magnetic component groups, each sector region having one magnetic component group, and each magnetic component group being capable of generating a magnetic field within its corresponding sector region, and the magnetic field being asymmetric along the magnetic pole center line.

[0006] In some embodiments of this application, each sector region further has a first magnetic bridge and a second magnetic bridge, and the first magnetic bridge and the second magnetic bridge are asymmetrically arranged with respect to the magnetic pole center line.

[0007] In some embodiments of this application, each magnetic component group includes a plurality of magnetic components, and the first magnetic bridge and the second magnetic bridge are respectively located between two adjacent magnetic components; wherein, the magnetic bridge widths of the first magnetic bridge and the second magnetic bridge are not equal, and the magnetic bridge width is the shortest distance between two adjacent magnetic components.

[0008] In some embodiments of this application, in each of the sector regions, the shapes of the first magnetic bridge and the second magnetic bridge are asymmetric with respect to the magnetic pole center line.

[0009] In some embodiments of this application, in each of the sector regions, the distance from the first magnetic bridge to the magnetic pole center line is greater than the distance from the second magnetic bridge to the magnetic pole center line.

[0010] In some embodiments of this application, the first magnetic bridge and the second magnetic bridge are respectively located on different sides of the magnetic pole center line.

[0011] In some embodiments of this application, the rotor main body has a shaft side;

[0012] Each of the magnetic component groups further includes a first magnetic flux layer and a second magnetic flux layer; the first magnetic flux layer is disposed close to the side of the rotating shaft, and the second magnetic flux layer is spaced apart from the first magnetic flux layer in the radial direction of the rotor body and is located on the side of the first magnetic flux layer away from the rotating shaft side;

[0013] The first magnetic flux layer includes a first magnetic component, a second magnetic component, and a third magnetic component. The first magnetic bridge is located between the first magnetic component and the second magnetic component, and the second magnetic bridge is located between the second magnetic component and the third magnetic component.

[0014] In some embodiments of the present application, the first magnetic component and the third magnetic component are located on both sides of the magnetic pole center line and are asymmetrically arranged with respect to the magnetic pole center line.

[0015] In some embodiments of the present application, the second magnetic component and the first magnetic component are located on the same side of the magnetic pole center line;

[0016] The second magnetic component and the third magnetic component are asymmetrically arranged with respect to the magnetic pole center line.

[0017] In some embodiments of the present application, a part of the second magnetic component and the first magnetic component are located on the same side of the magnetic pole center line, and another part of the second magnetic component and the third magnetic component are located on the same side of the magnetic pole center line;

[0018] The second magnetic component is asymmetrically arranged with respect to the magnetic pole center line.

[0019] In some embodiments of the present application, the first magnetic component includes a first magnet and a first magnetic slot;

[0020] The second magnetic component includes a second magnet and a second magnetic slot;

[0021] The third magnetic component includes a third magnet and a third magnetic slot; and

[0022] The first magnetic slot, the second magnetic slot, and the third magnetic slot are located within the rotor body, and the first magnet, the second magnet, and the third magnet are respectively located within the first magnetic slot, the second magnetic slot, and the third magnetic slot;

[0023] Wherein, the first magnetic bridge is located between the first magnetic slot and the second magnetic slot, and the second magnetic bridge is located between the second magnetic slot and the third magnetic slot.

[0024] In some embodiments of the present application, the first magnetic slot and the third magnetic slot are located on both sides of the magnetic pole center line and are asymmetrically arranged with respect to the magnetic pole center line.

[0025] In some embodiments of the present application, the second magnetic groove and the first magnetic groove are located on the same side of the magnetic pole center line;

[0026] The second magnetic groove and the third magnetic groove are asymmetrically arranged with respect to the magnetic pole center line.

[0027] In some embodiments of the present application, at least a part of the second magnetic groove and the first magnetic groove are located on the same side of the magnetic pole center line; another part is located on the other side of the magnetic pole center line from the third magnetic groove;

[0028] The second magnetic groove is symmetrically or asymmetrically arranged with respect to the magnetic pole center line.

[0029] In some embodiments of the present application, the first magnet and the third magnet are located on both sides of the magnetic pole center line and are asymmetrically arranged with respect to the magnetic pole center line.

[0030] In some embodiments of the present application, the second magnet and the first magnet are located on the same side of the magnetic pole center line;

[0031] The second magnet and the third magnet are asymmetrically arranged with respect to the magnetic pole center line.

[0032] In some embodiments of the present application, a part of the second magnet and the first magnet are located on the same side of the magnetic pole center line, and another part of the second magnet and the third magnet are located on the same side of the magnetic pole center line;

[0033] Wherein, the second magnet is symmetrically or asymmetrically arranged with respect to the magnetic pole center line.

[0034] In some embodiments of the present application, the second magnetic flux layer further includes a fourth magnetic group and a fifth magnetic group, the fourth magnetic group and the first magnetic group are located on the same side of the magnetic pole center line, and the fifth magnetic group and the third magnetic group are located on the same side of the magnetic pole center line.

[0035] In some embodiments of the present application, the fourth magnetic group and the fifth magnetic group are symmetrically or asymmetrically arranged with respect to the magnetic pole center line.

[0036] In some embodiments of the present application, the fourth magnetic group includes a fourth magnetic groove and a fourth magnet, and the fifth magnetic group includes a fifth magnetic groove and a fifth magnet;

[0037] The fourth magnetic groove and the fifth magnetic groove are located inside the rotor body, and the fourth magnet and the fifth magnet are located inside the fourth magnetic groove and the fifth magnetic groove; and

[0038] The fourth magnetic slot and the fifth magnetic slot are symmetric or asymmetric with respect to the magnetic pole center line; and / or the fourth magnet and the fifth magnet are symmetric or asymmetric with respect to the magnetic pole center line.

[0039] In some embodiments of the present application, the fourth magnetic slot and the first magnetic slot are located on the same side of the magnetic pole center line, and the fifth magnetic slot and the third magnetic slot are located on the same side of the magnetic pole center line;

[0040] The minimum distance from the fourth magnetic slot to the first magnetic slot is greater than or equal to the minimum distance from the fifth magnetic slot to the third magnetic slot.

[0041] In some embodiments of the present application, the minimum distance from the fourth magnetic slot to the second magnetic slot is greater than or equal to the minimum distance from the fifth magnetic slot to the third magnetic slot.

[0042] In some embodiments of the present application, the width ratio of the first magnetic bridge to the second magnetic bridge is 0.7 - 0.85.

[0043] In some embodiments of the present application, the rotor body further includes an outer wall on the side away from the rotating shaft; the rotor body further includes:

[0044] A third magnetic bridge located between the first magnetic slot and the outer wall; and

[0045] A fourth magnetic bridge located between the third magnetic slot and the outer wall;

[0046] Wherein, the width ratio of the third magnetic bridge to the fourth magnetic bridge is 0.8 - 0.95; and / or

[0047] The width ratio of the fourth magnetic bridge to the second magnetic bridge is 0.75 - 0.85.

[0048] In some embodiments of the present application, the widths of the first magnetic bridge, the second magnetic bridge, the third magnetic bridge and the fourth magnetic bridge satisfy:

[0049] 1.5mm ≤ L1 ≤ 2mm;

[0050] 1.5mm ≤ L2 ≤ 2mm;

[0051] 1mm ≤ L3 ≤ 1.5mm; and

[0052] 1mm ≤ L4 ≤ 1.5mm;

[0053] Wherein, L1, L2, L3 and L4 are the widths of the first magnetic bridge, the second magnetic bridge, the third magnetic bridge and the fourth magnetic bridge respectively.

[0054] In some embodiments of the present application, axially of the rotor body, the volume of the third magnet located at the rear side in the rotation direction of the rotor assembly is smaller than the sum of the volumes of the first magnet and the second magnet located at the front side in the rotation direction of the rotor assembly.

[0055] In some embodiments of the present application, the volume V3 of the third magnet, the volume V1 of the first magnet, and the volume V2 of the second magnet satisfy:

[0056] (V1 + V2 - V3):(V1 + V2) < 10% - 25%.

[0057] In some embodiments of the present application, the included angle between the extending direction of the fourth magnet and the extending direction of the fifth magnet is 120° - 150°.

[0058] In some embodiments of the present application, the sum of the cross-sectional areas perpendicular to the axial direction of the rotor body of the fourth magnetic groove and the fifth magnetic groove is 16 mm 2 ~25 mm 2 .

[0059] In some embodiments of the present application, at least one of the first magnet, the second magnet, and the third magnet includes at least two first sub-magnets and at least one second sub-magnet, and one second sub-magnet is located between two adjacent first sub-magnets.

[0060] In some embodiments of the present application, the first sub-magnet is a grain boundary permeable magnet, and the second sub-magnet is a thermally deformed magnet.

[0061] In some embodiments of the present application, the rotor assembly further includes:

[0062] A first coating layer; and

[0063] A second coating layer;

[0064] wherein, the first coating layer and the second coating layer respectively cover both ends of the rotor body axially of the rotor body; the first coating layer covers at least one of the first magnetic groove, the second magnetic groove, the third magnetic groove, the fourth magnetic groove, and the fifth magnetic groove; the second coating layer covers the remaining magnetic grooves among the first magnetic groove, the second magnetic groove, the third magnetic groove, the fourth magnetic groove, and the fifth magnetic groove except those covered by the first coating layer.

[0065] In some embodiments of the present application, the rotor assembly further includes a shaft hole, which extends axially of the rotor body and is used to receive and fix a shaft; the inner wall is the wall of the shaft hole; wherein, the shaft hole is a multi-keyway structure.

[0066] In some embodiments of the present application, the rotor body includes a plurality of rotor laminations. The lamination diameter coefficient of the rotor body is set between 0.19‰ and 1.68‰. The lamination diameter coefficient of the rotor body refers to the ratio of the thickness of the rotor body in the axial direction of the rotor body to the outer diameter of the rotor body.

[0067] In a second aspect of the present application, there is also provided an electric motor, which includes the rotor assembly as described above and a stator assembly arranged around the rotor assembly.

[0068] In some embodiments of the present application, the electric motor further includes a limit sensor, which is opposite to the air gap position between the stator assembly and the rotor assembly; wherein, the limit sensor is used to detect whether the outer diameter deformation of the rotor assembly exceeds the standard.

[0069] In some embodiments of the present application, the electric motor further includes a housing, and both the stator assembly and the rotor assembly are located inside the housing; wherein, the limit sensor is arranged on the housing.

[0070] In a third aspect of the present application, there is also provided a vehicle, which includes the rotor assembly as described above or the electric motor as described above.

[0071] The rotor assembly, electric motor and vehicle provided by the present application. The rotor assembly includes a rotor body and a plurality of magnetic component groups. The material of the rotor body is an amorphous material. The rotor body has a plurality of fan-shaped regions distributed along its circumferential direction. Each of the fan-shaped regions has a magnetic pole center line along the axial direction of the rotor body. Each of the fan-shaped regions has one of the magnetic component groups. Each of the magnetic component groups can generate a magnetic field within the fan-shaped region where it is located. The magnetic field is asymmetric along the magnetic pole center line, so that the magnetic field superposition point of the armature and the magnetic component group is asymmetrically distributed relative to the magnetic pole center line. Furthermore, the saturation degree around the superposition point can be reduced, the magnetic density saturation region can be reduced, and the technical problem of the output performance degradation caused by the power output saturation can be solved.

[0072] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0074] In order to more fully understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0075] Figure 1Schematic diagram of a rotor assembly provided for some exemplary embodiments of the present application.

[0076] Figure 2 For Figure 1 Enlarged view of a sector area of the rotor assembly shown.

[0077] Figure 3 For Figure 2 Stress simulation diagram of the sector area shown.

[0078] Figure 4 Cross-sectional view of a magnet provided for some exemplary embodiments of the present application.

[0079] Figure 5 Schematic diagram of the influence of the rotor stack diameter ratio of the rotor assembly on the yield rate provided for some exemplary embodiments of the present application.

[0080] Figure 6 Schematic diagram of a rotor assembly provided for some other exemplary embodiments of the present application.

[0081] Figure 7 Partial schematic diagram of a motor provided for some exemplary embodiments of the present application.

[0082] Figure 8 Partial module schematic diagram of a motor provided for some exemplary embodiments of the present application.

[0083] Figure 9 Module schematic diagram of a vehicle provided for the present application.

[0084] Description of reference numerals:

[0085] 1000, vehicle; 100, motor; 110, rotor assembly; 120, stator assembly; 130, limit sensor; 140, air gap; 150, housing; 101, sector area; 1011, rotor body; 1012, magnetic component group; R, rotation direction; 111, shaft side;

[0086] 10, first magnetic flux layer; 20, second magnetic flux layer; 102, first magnetic component; 103, second magnetic component; 104, third magnetic component; 105, fourth magnetic component; 106, fifth magnetic component; 13, first magnetic slot; 14, second magnetic slot; 15, third magnetic slot; 21, fourth magnetic slot; 22, fifth magnetic slot; 31, outer wall; 32, inner wall; 33, first magnetic bridge; 34, second magnetic bridge; 35, third magnetic bridge; 36, fourth magnetic bridge; 40, shaft hole; 501, first magnet; 502, second magnet; 503, third magnet; 504, fourth magnet; 505, fifth magnet; 51, first sub-magnet; 52, second sub-magnet; 61, first coating layer; 62, second coating layer. Detailed description of the invention

[0087] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0088] Please refer to Figures 1 to 4 , the present application provides a rotor assembly 110, the rotor assembly includes a rotor main body 1011 and a plurality of magnetic part groups 1012; the material of the rotor main body 1011 is an amorphous material, the rotor main body 1011 has a plurality of sector regions 101 distributed along its circumferential direction, and each of the sector regions 101 has a magnetic pole center line L along the axial direction of the rotor main body 1011. Each sector region 101 has a magnetic part group 1012, and each magnetic part group 1012 can generate a magnetic field within the sector region 101 where it is located, and the magnetic field is asymmetric along the magnetic pole center line L.

[0089] Among them, the motor rotor is an important part of the motor, and the motor can be applied to a vehicle as a drive motor or a generator of the vehicle. Conventional motor rotors use crystalline materials. However, the loss of crystalline materials is relatively large, and it cannot meet the requirements of high efficiency of vehicle motors. The material of the rotor main body 1011 of the present application is an amorphous material. Compared with crystalline materials, the atoms inside the amorphous material are disorderly arranged and have the characteristics of low loss, which can enable the motor to simultaneously achieve high output efficiency and high output torque, and can meet the requirements of high efficiency of vehicle motors.

[0090] Among them, the number of sector regions 101 corresponds to the number of magnetic poles of the motor. In some embodiments of the present application, the number of sector regions 101 provided in a rotor main body 1011 is 6. The number of sector regions 101 provided in a rotor main body 1011 is not limited to 6 and can be set according to actual situations.

[0091] Among them, the magnetic pole center line L of the sector region 101 refers to a straight line that divides the sector region 101 into two equal parts on average, and this straight line passes through the center of the rotor main body 1011. In the rotor main body 1011, a certain interval distance is formed between adjacent magnetic poles, and the middle position of this interval distance is the boundary of the sector region 101. The boundary of the sector region 101 and the magnetic pole center line L of the sector region 101 can be obtained through specific dimension measurement. It can be understood that the magnetic pole center line L described in the embodiments of the present application refers to a virtual line and is not depicted on the product structure. It is mainly used to assist in judging the structural characteristics and does not limit the product itself structure.

[0092] In this embodiment, the rotor body 1011 is a circular structure formed integrally with a shaft hole. Each rotor body 1011 may include a plurality of sector regions 101. The arrangements and structures of the plurality of sector regions 101 may be the same. In this application, only one of the sector regions 101 is taken as an example for illustration.

[0093] Wherein, after the magnetic component group 1012 is arranged on the rotor body 1011, the magnetic field of the magnetic component group 1012 is superposed with the magnetic field of the stator assembly 120 of the motor, resulting in a magnetic field superposition in a local area. After the magnetic fields in some areas are superposed, there is a region with a relatively large magnetic field density, which is called the magnetic field superposition point. When the magnetic field density at this magnetic field superposition point is relatively large, saturation suppression is likely to occur, affecting the efficiency improvement of the motor. That is, when the load of the motor exceeds its output capacity, a phenomenon of power output saturation will occur, that is, the motor cannot provide more power output, resulting in a decline in the performance of the machine. In this application, through the following settings: the magnetic field generated by the magnetic component group 1012 in its corresponding sector region 101 is arranged asymmetrically along the magnetic pole center line, so that the magnetic field superposition point of the armature and the magnetic component group is asymmetrically distributed relative to the magnetic pole center line, thereby reducing the saturation degree around the superposition point and reducing the magnetic density saturation region, and solving the technical problem of the decline in output performance caused by power output saturation.

[0094] In some embodiments of this application, each sector region 101 further has a first magnetic bridge 33 and a second magnetic bridge 34, and the first magnetic bridge 33 and the second magnetic bridge 34 are arranged asymmetrically with respect to the magnetic pole center line L.

[0095] In this application, the first magnetic bridge 33 and the second magnetic bridge 34 are arranged asymmetrically with respect to the magnetic pole center line L, which is beneficial to achieving the asymmetry of the magnetic field with respect to the magnetic pole center line L, thereby solving the technical problem of the decline in output performance caused by power output saturation.

[0096] Please continue to refer to Figure 2 , in some embodiments of this application, each magnetic component group 1012 includes a plurality of magnetic components. The first magnetic bridge 33 and the second magnetic bridge 34 are respectively located between two adjacent magnetic components, and the magnetic bridge width of the first magnetic bridge 33 is not equal to the magnetic bridge width of the second magnetic bridge 34. Wherein, the magnetic bridge width refers to the shortest distance between two adjacent magnetic components.

[0097] In this application, the magnetic bridge width of the first magnetic bridge 33 is not equal to the magnetic bridge width of the second magnetic bridge 34, realizing the asymmetry of the magnetic field along the magnetic pole center line L, so that the magnetic field superposition point of the armature and the magnetic component group is asymmetrically distributed relative to the magnetic pole center line, thereby reducing the saturation degree around the superposition point and reducing the magnetic density saturation region, and solving the technical problem of the decline in output performance caused by power output saturation.

[0098] In some embodiments of the present application, in each sector region 101, the shapes of the first magnetic bridge 33 and the second magnetic bridge 34 are asymmetric with respect to the magnetic pole center line L. By defining the shapes of the first magnetic bridge 33 and the second magnetic bridge 34, the magnetic field is arranged asymmetrically along the magnetic pole center line L.

[0099] In some embodiments of the present application, in each sector region 101, the distance from the first magnetic bridge 33 to the magnetic pole center line L is greater than the distance from the second magnetic bridge 34 to the magnetic pole center line L. By defining the positions of the first magnetic bridge 33 and the second magnetic bridge 34 with respect to the magnetic pole center line L, the magnetic field is arranged asymmetrically along the magnetic pole center line L.

[0100] In some embodiments of the present application, the first magnetic bridge 33 and the second magnetic bridge 34 are respectively located on different sides of the magnetic pole center line L.

[0101] Wherein, the rotor main body 1011 has a shaft side 111; each magnetic component group 1012 includes a first magnetic flux layer 10 and a second magnetic flux layer 20; the first magnetic flux layer 10 is arranged close to the shaft side 111, and the second magnetic flux layer 20 is arranged at an interval from the first magnetic flux layer 10 in the radial direction of the rotor main body 1011 and is located on the side of the first magnetic flux layer 10 away from the shaft side 111. The first magnetic flux layer 10 includes a first magnetic component 102, a second magnetic component 103 and a third magnetic component 104. The first magnetic bridge 33 is located between the first magnetic component 102 and the second magnetic component 103, and the second magnetic bridge 34 is located between the second magnetic component 103 and the third magnetic component 104. The positions of the first magnetic bridge 33 and the second magnetic bridge 34 are defined by defining the first magnetic component 102, the second magnetic component 103 and the third magnetic component 104.

[0102] In some embodiments of the present application, the first magnetic component 102 and the third magnetic component 104 are located on both sides of the magnetic pole center line L and are arranged asymmetrically with respect to the magnetic pole center line L. By defining the asymmetry of the first magnetic component 102 and the third magnetic component 104 with respect to the magnetic pole center line L, the asymmetry of the first magnetic bridge 33 and the second magnetic bridge 34 is indirectly described, and further the asymmetry of the magnetic field is described.

[0103] In some embodiments of the present application, the second magnetic component 103 and the first magnetic component 102 are located on the same side of the magnetic pole center line L, and the second magnetic component 103 and the third magnetic component 104 are arranged asymmetrically with respect to the magnetic pole center line L. By defining the relative positional relationship between the second magnetic component 103 and the magnetic pole center line L, the first magnetic bridge 33 and the second magnetic bridge 34 are arranged asymmetrically with respect to the magnetic pole center line L, and further the magnetic field and the second magnetic component 103 are arranged asymmetrically with respect to the magnetic pole center line L.

[0104] In some embodiments of the present application, a part of the second magnetic component 103 and the first magnetic component 102 are on the same side of the magnetic pole center line L, and another part and the third magnetic component 104 are on the same side of the magnetic pole center line L. The second magnetic component 103 is asymmetrically arranged with respect to the magnetic pole center line L. By defining the relative positional relationship between the second magnetic component 103 and the magnetic pole center line L, the first magnetic bridge 33 and the second magnetic bridge 34 are asymmetrically arranged with respect to the magnetic pole center line L, and further the magnetic field of the second magnetic component 103 is asymmetrically arranged with respect to the magnetic pole center line L.

[0105] Among them, the first magnetic component 102 includes a first magnet 501 and a first magnetic slot 13. The second magnetic component 103 includes a second magnet 502 and a second magnetic slot 14. The third magnetic component 104 includes a third magnet 503 and a third magnetic slot 15. The first magnetic slot 13, the second magnetic slot 14, and the third magnetic slot 15 are located inside the rotor main body 1011. The first magnet 501, the second magnet 502, and the third magnet 503 are respectively located in the first magnetic slot 13, the second magnetic slot 14, and the third magnetic slot 15. The first magnetic bridge 33 is located between the first magnetic slot 13 and the second magnetic slot 14, and the second magnetic bridge 34 is located between the second magnetic slot 14 and the third magnetic slot 15. Among them, the magnetic bridge width of the first magnetic bridge 33 is further the shortest distance between the first magnetic slot 13 and the second magnetic slot 14, and the magnetic bridge width of the second magnetic bridge 34 is further the shortest distance between the second magnetic slot 14 and the third magnetic slot 15.

[0106] In some embodiments of the present application, the first magnet 501, the second magnet 502, and the third magnet 503 are permanent magnets, so that the first magnet 501, the second magnet 502, and the third magnet 503 can always have magnetism, which is convenient for ensuring the operation of the rotor assembly 110 of the motor and improving the output torque of the motor.

[0107] In some embodiments of the present application, the second magnetic slot 14 is located between the first magnetic slot 13 and the third magnetic slot 15. The first magnetic slot 13 and the third magnetic slot 15 are respectively located on opposite sides of the magnetic pole center line L and are asymmetrically arranged with respect to the magnetic pole center line. By setting the first magnetic slot 13 and the third magnetic slot 15 to be asymmetrically arranged with respect to the magnetic pole center line, the magnetic fields on both sides of the magnetic pole center line L are different.

[0108] In some embodiments of the present application, the second magnetic slot 14 and the first magnetic slot 13 are on the same side of the magnetic pole center line L; the second magnetic slot 14 and the third magnetic slot 15 are asymmetrically arranged with respect to the magnetic pole center line L. By setting the second magnetic slot 14 and the third magnetic slot 15 to be asymmetrically arranged with respect to the magnetic pole center line, the magnetic fields on both sides of the magnetic pole center line L are different.

[0109] In some embodiments of the present application, at least a part of the second magnetic groove 14 is on the same side of the magnetic pole center line L as the first magnetic groove 13; another part is on the other side of the magnetic pole center line L from the third magnetic groove 15, and the second magnetic groove 14 is symmetrically or asymmetrically arranged with respect to the magnetic pole center line L. Since the second magnetic groove 14 is located between the first magnetic groove 13 and the third magnetic groove 15, on the premise that the first magnetic groove 13 and the third magnetic groove 15 are asymmetrically arranged with respect to the magnetic pole center line L, whether the second magnetic groove 14 is symmetric or asymmetric with respect to the magnetic pole center line L can make the first magnetic bridge 33 and the second magnetic bridge 34 asymmetrically arranged with respect to the magnetic pole center line L, thereby making the magnetic fields on both sides of the magnetic pole center line L asymmetric.

[0110] In some embodiments of the present application, the first magnet 501 and the third magnet 503 are located on both sides of the magnetic pole center line L and are asymmetrically arranged with respect to the magnetic pole center line L. By arranging the first magnet 501 and the third magnet 503 asymmetrically with respect to the magnetic pole center line, the magnetic fields on both sides of the magnetic pole center line L can be made different.

[0111] In some embodiments of the present application, the second magnet 502 is on the same side of the magnetic pole center line L as the first magnet 501, and the second magnet 502 and the third magnet 503 are asymmetrically arranged with respect to the magnetic pole center line L. By arranging the second magnet 502 and the third magnet 503 asymmetrically with respect to the magnetic pole center line L, the magnetic fields on both sides of the magnetic pole center line L can be made different.

[0112] In some embodiments of the present application, a part of the second magnet 502 is on the same side of the magnetic pole center line L as the first magnet 501, and another part is on the same side of the magnetic pole center line L as the third magnet 503; the second magnet 502 is symmetrically or asymmetrically arranged with respect to the magnetic pole center line L. Since the second magnet 502 is located between the first magnet 501 and the third magnet 503, on the premise that the first magnet 501 and the third magnet 503 are asymmetrically arranged with respect to the magnetic pole center line L, whether the second magnet 502 is symmetric or asymmetric with respect to the magnetic pole center line L can make the first magnetic bridge 33 and the second magnetic bridge 34 asymmetrically arranged with respect to the magnetic pole center line L, thereby making the magnetic fields on both sides of the magnetic pole center line L asymmetric.

[0113] In some embodiments of the present application, the fourth magnetic assembly 105 includes a fourth magnetic groove 21 and a fourth magnet 504, and the fifth magnetic assembly 106 includes a fifth magnetic groove 22 and a fifth magnet 505. The fourth magnetic groove 21 and the fifth magnetic groove 22 are located inside the rotor main body 1011, and the fourth magnet 504 and the fifth magnet 505 are located inside the fourth magnetic groove 21 and the fifth magnetic groove 22. The fourth magnetic groove 21 and the fifth magnetic groove 22 are symmetrically or asymmetrically arranged with respect to the magnetic pole center line L; and / or the fourth magnet 504 and the fifth magnet 505 are symmetrically or asymmetrically arranged with respect to the magnetic pole center line L.

[0114] By setting two layers of magnetic component groups, magnets can be fully utilized within the limited space of the rotor body 1011, and the motor torque can be increased without increasing the amount of magnets used.

[0115] By asymmetrically setting the fourth magnetic slot 21 and the fifth magnetic slot 22 with respect to the magnetic pole center line L or asymmetrically setting the fourth magnet 504 and the fifth magnet 505 with respect to the magnetic pole center line L, the magnetic fields on both sides of the magnetic pole center line L can be set asymmetrically.

[0116] In some embodiments of the present application, the fourth magnetic slot 21 and the first magnetic slot 13 are located on the same side of the magnetic pole center line L, and the fifth magnetic slot 22 and the third magnetic slot 15 are located on the same side of the magnetic pole center line L; the minimum distance from the fourth magnetic slot 21 to the first magnetic slot 13 is greater than or equal to the minimum distance from the fifth magnetic slot 22 to the third magnetic slot 15. In this way, the fourth magnetic slot 21 and the first magnetic slot 13 can be made asymmetric compared to the case where the fourth magnetic slot 21 and the first magnetic slot 13 are symmetrically arranged.

[0117] Among them, the minimum distance from the fourth magnetic slot 21 to the first magnetic slot 13 in this case is greater than or equal to the minimum distance from the fifth magnetic slot 22 to the third magnetic slot 15. Compared with the case where the minimum distance from the fourth magnetic slot to the first magnetic slot is less than the minimum distance from the fifth magnetic slot to the third magnetic slot, the highest magnetic density point in the fan-shaped region 101 where the former is located moves to the left compared to the highest magnetic density point of the latter. That is, the magnetic density points between the fourth magnetic slot 21 and the first magnetic slot 13 move away from the third magnetic slot 15, and the magnetic density points between the fifth magnetic slot 22 and the third magnetic slot 15 move towards the second magnetic slot 14. That is, the magnetic density points move towards the wider width between the first magnetic flux layer 10 and the second magnetic flux layer 20. The magnetic field conduction width is increased, thereby reducing the magnetic density and alleviating the magnetic density saturation degree of the rotor assembly. It can not only further improve the problem of the output performance decline caused by magnetic density saturation in the heavy-load stage of the rotor assembly 110 of the motor and increase the output torque of the rotor assembly 110 of the motor, but also further optimize the stress distribution of the rotor assembly 110 of the motor to achieve the minimum high-speed equivalent stress.

[0118] In some embodiments of the present application, the fourth magnetic slot 21 and the first magnetic slot 13 are located on the same side of the magnetic pole center line L, and the fifth magnetic slot 22 and the third magnetic slot 15 are located on the same side of the magnetic pole center line L; the minimum distance from the fourth magnetic slot 21 to the second magnetic slot 14 is greater than or equal to the minimum distance from the fifth magnetic slot 22 to the third magnetic slot 15.

[0119] Among them, the minimum distance from the fourth magnetic slot 21 to the second magnetic slot 14 in this case is greater than or equal to the minimum distance from the fifth magnetic slot 22 to the third magnetic slot 15. Compared with the situation where the minimum distance from the fourth magnetic slot to the second magnetic slot is less than the minimum distance from the fifth magnetic slot to the third magnetic slot, the highest magnetic density point in the sector area 101 where the former is located moves to the left compared with the highest magnetic density point of the latter. That is, the magnetic density points between the fourth magnetic slot 21 and the second magnetic slot 14 move away from the third magnetic slot 15, and the magnetic density points between the fifth magnetic slot 22 and the third magnetic slot 15 move closer to the second magnetic slot 14. That is, the magnetic density points move to the wider part between the first magnetic flux layer 10 and the second magnetic flux layer 20. The magnetic field current-carrying width is increased, thereby reducing the magnetic density and alleviating the magnetic density saturation degree of the rotor assembly. It can not only further improve the problem of the output performance decline caused by magnetic density saturation in the heavy-load stage of the rotor assembly 110 of the motor, improve the output torque of the rotor assembly 110 of the motor, but also further optimize the stress distribution of the rotor assembly 110 of the motor, and achieve the minimum high-speed equivalent stress.

[0120] Hereinafter, taking the first magnet 501 and the third magnet 503 as examples, different situations of the magnetic field asymmetry on both sides of the magnetic pole center line L will be described in detail. Correspondingly, the situation where the second magnet 502 and the third magnet 503 are asymmetrically arranged with respect to the magnetic pole center line L is similar.

[0121] Specifically, in each sector area 101, the first magnet 501 and the third magnet 503 are arranged on both sides of the magnetic pole center line L, and the magnetic properties of the first magnet 501 and the third magnet 503 are asymmetrically distributed with respect to the magnetic pole center line L, so that the magnetic field generated by the magnetic part group 1012 in a single sector area 101 is asymmetrically distributed with respect to the magnetic pole center line L. As Figure 2 shown, the first magnet 501 is located on the left side and the third magnet 503 is located on the right side, and the magnetic field energy on the left side can be greater than or less than the magnetic field energy on the right side.

[0122] Specifically, the magnetic properties of the first magnet 501 and the third magnet 503 are asymmetrically distributed with respect to the magnetic pole center line L, that is, the magnetic properties of the first magnet 501 and the third magnet 503 are different.

[0123] Specifically, it can be achieved that the magnetic properties of the first magnet 501 and the third magnet 503 in the same sector area 101 are asymmetrically arranged with respect to the magnetic pole center line L by considering aspects such as the positions, structures and sizes of the first magnet 501 and the third magnet 503.

[0124] Furthermore, the magnetic energy products of the first magnet 501 and the third magnet 503 are different, which can achieve different magnetic properties of the first magnet 501 and the third magnet 503. The magnetic fluxes of the first magnet 501 and the third magnet 503 are different, that is, the applied currents are different, which can achieve different magnetic properties of the first magnet 501 and the third magnet 503. The magnetic fields of the first magnet 501 and the third magnet 503 are different, which can achieve different magnetic properties of the first magnet 501 and the third magnet 503. The magnetic induction intensities, i.e., magnetic densities, of the first magnet 501 and the third magnet 503 are different, which can achieve different magnetic properties of the first magnet 501 and the third magnet 503. The magnetomotive forces of the first magnet 501 and the third magnet 503 are different, that is, the applied voltages are different, which can achieve different magnetic properties of the first magnet 501 and the third magnet 503. The magnetic resistances of the first magnet 501 and the third magnet 503 are different, that is, the applied voltages are different, which can achieve different magnetic properties of the first magnet 501 and the third magnet 503.

[0125] Exemplarily, a fluxmeter can be connected to a single coil or a Helmholtz coil to measure the magnetic flux of a magnet. A magnetic field strength tester can be used to detect the magnetic field of a magnet. Specifically, a dedicated instrument can also be used to test the remanence, coercive force, etc. of a permanent magnet to obtain the magnetic energy product, and the embodiments of the present invention do not make specific limitations thereto.

[0126] Optionally, by reducing the magnetic field energy of the first magnet 501 or the third magnet 503, the magnetic properties of the first magnet 501 and the third magnet 503 can be asymmetrically distributed with respect to the magnetic pole center line L. In this way, the ratio of the output torque of the motor to the total magnetic field energy of the magnetic component group 1012 can be increased, and further, the utilization rate of the magnetic field energy of the magnetic component group 1012 can be improved, which is convenient for reducing the amount of rare earth in the magnetic component group 1012 and reducing the cost of the rotor assembly 110 of the motor.

[0127] Specifically, the magnetic component group 1012 accounts for a relatively large proportion in the cost of the motor. By reducing the amount of the magnetic component group 1012, the effect of reducing the cost of the motor is more obvious.

[0128] Specifically, the magnetic field energy can be the product of the magnetic energy product and the volume, that is, the magnetic field energy of the first magnet 501 can be the product of the magnetic energy product and the volume of the first magnet 501, and the magnetic field energy of the third magnet 503 can be the product of the magnetic energy product and the volume of the third magnet 503.

[0129] Exemplarily, the magnetic energy product of the first magnet 501 can be greater than or less than the magnetic energy product of the third magnet 503, which can improve the utilization rate of the sum of the magnetic energy products of the magnetic component group 1012. Or, the volume of the first magnet 501 can be greater than or less than the volume of the third magnet 503, which can improve the utilization rate of the sum of the volumes of the magnetic component group 1012.

[0130] Specifically, the magnetic energy product can be the product of the residual magnetism and the coercive force. The magnetic energy product increases with the increase of the residual magnetism and also increases with the increase of the volume. The residual induction Br (Residual Induction), unit: Gauss, that is, after removing the magnetic field from the saturated state, the remaining magnetic flux density, represents the strength of the magnetic field that the magnet can provide externally. The coercive force Hc (Coercive Force), unit: Oersteds, that is, when the magnet is placed in an externally applied reverse magnetic field, when the externally applied magnetic field increases to a certain intensity, the magnetism of the magnet will disappear, and this ability to resist the externally applied magnetic field is called the coercive force, representing the demagnetization resistance ability of the magnet. The magnetic energy product BHmax, unit: Gauss - Oersteds, that is, the magnetic field energy generated by the material per unit volume, is a physical quantity representing how much energy the magnet can store.

[0131] Exemplarily, when the coercive forces of the first magnet 501 and the third magnet 503 are the same, and the residual magnetism of the first magnet 501 is greater than that of the third magnet 503, then the magnetic energy product of the first magnet 501 is greater than that of the third magnet 503. When the residual magnetisms of the first magnet 501 and the third magnet 503 are the same, and the coercive force of the first magnet 501 is greater than that of the third magnet 503, then the magnetic energy product of the first magnet 501 is greater than that of the third magnet 503.

[0132] Specifically, in a single sector area 101, the magnetic energy product of the first magnet 501 can be greater than or less than that of the third magnet 503. As Figure 2 shown, it can be that the first magnet 501 is located on the front side of the rotation direction of the rotor assembly 110 of the motor, and the third magnet 503 is located on the rear side of the rotation direction of the rotor assembly 110 of the motor. Or, it can also be that the first magnet 501 is located on the rear side of the rotation direction of the rotor assembly 110 of the motor, and the third magnet 503 is located on the front side of the rotation direction of the rotor assembly 110 of the motor.

[0133] Optionally, in each sector area 101, the volume of the first magnet 501 is greater than or less than that of the third magnet 503, which is convenient for ensuring that the magnetic properties of the first magnet 501 and the third magnet 503 in a single sector area 101 are asymmetrically distributed relative to the magnetic pole center line L of this sector area 101.

[0134] Optionally, in each sector area 101, the coercive force of the first magnet 501 is greater than or less than that of the third magnet 503, which is convenient for ensuring that the magnetic properties of the first magnet 501 and the third magnet 503 in a single sector area 101 are asymmetrically distributed relative to the magnetic pole center line L of this sector area 101.

[0135] Optionally, in each sector region 101, the remanence of the first magnet 501 is greater than or less than the remanence of the third magnet 503, which is convenient for ensuring that the magnetic properties of the first magnet 501 and the third magnet 503 in a single sector region 101 are asymmetrically distributed relative to the magnetic pole center line L of this sector region 101.

[0136] Specifically, in the same sector region 101, when the remanences of the first magnet 501 and the third magnet 503 are the same, the coercivities of the first magnet 501 and the third magnet 503 can be designed to be different; when the coercivities of the first magnet 501 and the third magnet 503 are the same, the remanences of the first magnet 501 and the third magnet 503 can be designed to be different; or, the remanences of the first magnet 501 and the third magnet 503 can also be designed to be different and the coercivities are different, so as to achieve different magnetic energy products of the first magnet 501 and the third magnet 503 in a single sector region 101.

[0137] For example, the shape of the first magnet 501 is a straight plate shape, and the shape of the third magnet 503 can be an arc shape; or, the shape of the first magnet 501 can be an arc shape, and the shape of the third magnet 503 can be a straight plate shape.

[0138] Or, the thickness of the first magnet 501 is greater than or less than the thickness of the third magnet 503, or the length of the first magnet 501 is greater than or less than the length of the third magnet 503, so as to achieve an asymmetric distribution of the shapes of the first magnet 501 and the third magnet 503 in the same sector region 101 relative to the magnetic pole center line L.

[0139] Optionally, in each sector region 101, the orientation of the first magnet 501 and the third magnet 503 is asymmetrically distributed relative to the magnetic pole center line L, which is convenient for ensuring that the magnetic properties of the first magnet 501 and the third magnet 503 in a single sector region 101 are asymmetrically distributed relative to the magnetic pole center line L of this sector region 101.

[0140] Specifically, the magnetism of a permanent magnet mainly comes from its crystal structure that is easily magnetized. It can obtain extremely high magnetism under the action of an external strong magnetic field, and its magnetism will not disappear after the external magnetic field disappears. Magnetic materials are divided into two categories: isotropic magnets and anisotropic magnets. The magnetic properties of isotropic magnets are the same in any direction and can be attracted together arbitrarily. The magnetic properties of anisotropic magnets are different in different directions, and the direction in which the best magnetic properties can be obtained is called the orientation direction of the magnet. Applying a magnetic field to the permanent magnet along the magnetic field orientation direction and gradually increasing the magnetic field strength to reach the technical saturation state, this process is called magnetization. As Figure 7 , shows the magnetization directions of permanent magnets in different forms.

[0141] Optionally, in each sector region 101, the types of the first magnet 501 and the third magnet 503 are asymmetrically distributed relative to the magnetic pole center line L, which is convenient for ensuring that the magnetic properties of the first magnet 501 and the third magnet 503 in a single sector region 101 are asymmetrically distributed relative to the magnetic pole center line L of this sector region 101.

[0142] Specifically, the types of the first magnet 501 and the third magnet 503 are different, which may specifically be different categories, or different grades, etc.

[0143] In some embodiments of the present application, the first magnetic groove 13, the second magnetic groove 14, the third magnetic groove 15, the fourth magnetic groove 21 and the fifth magnetic groove 22 all include a straight segment and an arc segment, and the cross-sectional areas of the first magnetic groove 13, the second magnetic groove 14, the third magnetic groove 15, the fourth magnetic groove 21 and the fifth magnetic groove 22 in the axial direction of the rotor main body 1011 are respectively larger than the cross-sectional areas of the first magnet 501, the second magnet 502, the third magnet 503, the fourth magnet 504 and the fifth magnet 505 in the axial direction. The arc segment can adjust the magnetic field distribution, improve the demagnetization resistance ability of the motor without increasing the amount of magnets, etc., save costs, and have little influence on the output performance of the motor. The size of the arc segment can be adjusted according to the actual design.

[0144] In some embodiments of the present application, the rotor main body 1011 further includes an outer wall 31, and the outer wall 31 is away from the shaft side 111. The rotor main body 1011 further includes a third magnetic bridge 35 and a fourth magnetic bridge 36. The third magnetic bridge 35 is located between the first magnetic groove 13 and the outer wall 31, and the fourth magnetic bridge 36 is located between the third magnetic groove 15 and the outer wall 31.

[0145] Please refer to Figure 3 , Figure 3 for a simulation diagram of the stress distribution within a sector region 101. It can be seen from Figure 3 that the stress of the second magnetic bridge 34 is greater than the stress of the first magnetic bridge 33, the stress of the first magnetic bridge 33 is greater than the stress of the fourth magnetic bridge 36, and the stress of the fourth magnetic bridge 36 is greater than the stress of the third magnetic bridge 35.

[0146] Among them, the volume of the third magnet 503 on the rear side of the rotation direction of the rotor assembly 110 of the motor is larger than the volumes of the second magnet 502 and the first magnet 501 on the front side of the rotation direction of the rotor assembly 110. During the rotation of the rotor assembly 110 (for example, clockwise rotation), the third magnet 503 generates a centrifugal force to the left, and the centrifugal force acts at the position of the second magnetic bridge 34, resulting in a relatively large stress on the second magnetic bridge 34. During the reverse rotation of the rotor assembly 110 (for example, counterclockwise rotation), the third magnet 503 generates a centrifugal force to the right, and the centrifugal force acts at the position of the fourth magnetic bridge 36. The first magnet 501 generates a centrifugal force to the left, and the centrifugal force acts at the position of the third magnetic bridge 35. Since the volume of the third magnet 503 is larger than the volume of the first magnet 501, the stress on the second magnetic bridge 34 is greater than the stress on the first magnetic bridge 33. Similarly, since the stress on the first magnetic bridge 33 is generated from the first magnet 501 and the second magnet 502 respectively, the stress on the second magnetic bridge 34 is generated from the third magnet 503 and the second magnet 502 respectively, and the stress on the third magnetic bridge 35 and the fourth magnetic bridge 36 is generated from the first magnet 501 and the third magnet 503 respectively. Therefore, the stress on the second magnetic bridge 34 is greater than the stress on the first magnetic bridge 33, the stress on the first magnetic bridge 33 is greater than the stress on the fourth magnetic bridge 36, and the stress on the fourth magnetic bridge 36 is greater than the stress on the third magnetic bridge 35.

[0147] Therefore, the risk of stress concentration caused by the high-speed rotation of the rotor assembly can be reduced by increasing the widths of the magnetic bridges with relatively large stress (for example, increasing the first magnetic bridge 33 and the second magnetic bridge 34), setting an optimal magnetic bridge ratio, and achieving stress distribution.

[0148] In some embodiments of the present application, the width ratio (magnetic bridge ratio) of the first magnetic bridge 33 to the second magnetic bridge 34 is 0.7 - 0.85. Considering that the stress at the first magnetic bridge 33 and the second magnetic bridge 34 is relatively large, by setting a reasonable width ratio of the first magnetic bridge 33 to the second magnetic bridge 34, the stress at the first magnetic bridge 33 and the second magnetic bridge 34 can be alleviated, stress distribution can be achieved, and thus the risk of stress concentration caused by the high-speed rotation of the rotor assembly can be reduced.

[0149] In some embodiments of the present application, the width ratio (magnetic bridge ratio) of the third magnetic bridge 35 to the fourth magnetic bridge 36 is 0.8 - 0.95, and the width ratio (magnetic bridge ratio) of the fourth magnetic bridge 36 to the second magnetic bridge 34 is 0.75 - 0.85.

[0150] Among them, the magnetic bridge width of the third magnetic bridge 35 is the shortest distance between the third magnetic slot 15 and the outer wall 31, and the magnetic bridge width of the fourth magnetic bridge 36 is the shortest distance between the first magnetic slot 13 and the outer wall 31.

[0151] Since the stress at the second magnetic bridge 34 is greater than that at the fourth magnetic bridge 36, and the stress at the fourth magnetic bridge 36 is greater than that at the third magnetic bridge 35, by increasing the widths of the second magnetic bridge 34 and the fourth magnetic bridge 36 and setting a reasonable magnetic bridge ratio, the stress at the second magnetic bridge 34 and the fourth magnetic bridge 36 can be alleviated, stress distribution can be achieved, and thus the risk of stress concentration caused by the high-speed rotation of the rotor assembly 110 can be further reduced.

[0152] In some embodiments of the present application, the widths of the first magnetic bridge 33, the second magnetic bridge 34, the third magnetic bridge 35, and the fourth magnetic bridge 36 satisfy:

[0153] 1.5 mm ≤ L1 ≤ 2 mm;

[0154] 1.5 mm ≤ L2 ≤ 2 mm;

[0155] 1 mm ≤ L3 ≤ 1.5 mm; and

[0156] 1 mm ≤ L4 ≤ 1.5 mm;

[0157] wherein, L1, L2, L3, and L4 are the widths of the first magnetic bridge 33, the second magnetic bridge 34, the third magnetic bridge 35, and the fourth magnetic bridge 36, respectively.

[0158] Since the stress at the first magnetic bridge 33 and the second magnetic bridge 34 is greater than that at the third magnetic bridge 35 and the fourth magnetic bridge 36, the widths of the first magnetic bridge 33 and the second magnetic bridge 34 are greater than those of the third magnetic bridge 35 and the fourth magnetic bridge 36 to achieve stress distribution and reduce the problem of high-speed stress concentration of the rotor.

[0159] In some embodiments of the present application, in the axial direction of the rotor main body 1011, the volume V3 of the third magnet 503 located at the rear side of the rotation direction R of the rotor assembly 110 is smaller than the sum of the volume V1 of the first magnet 501 and the volume V2 of the second magnet 502 located at the front side of the rotation direction R of the rotor assembly 110. That is, V3 < V1 + V2.

[0160] In some embodiments of the present application, V3, V1, and V2 satisfy (V1 + V2 - V3):(V1 + V2) < 10% - 25%. That is, the volume V3 of the third magnet 503 located at the rear side of the rotation direction R of the rotor assembly 110 is less than the sum of the volume V1 of the first magnet 501 and the volume V2 of the second magnet 502 located at the front side of the rotation direction R of the rotor assembly 110 by 10% - 25%. In this way, it is convenient to ensure that the magnetic properties of the first magnet 501 and the second magnet 502 in a single sector area 101 and the magnetic properties of the third magnet 503 are asymmetrically distributed relative to the magnetic pole center line L of the sector area 101, thereby improving the problem of the output performance degradation caused by magnetic density saturation in the heavy-load stage of the rotor assembly 110 of the motor. In addition, the magnetic field energy of the third magnet 503 can be reduced to improve the utilization rate of the magnetic field energy of the first magnet 501, the second magnet 502, and the third magnet 503, and effectively ensure that the rotor assembly 110 of the motor outputs sufficient torque.

[0161] In some embodiments of the present application, the included angle α between the extending direction of the fourth magnet 504 and the extending direction of the fifth magnet 505 satisfies: 120° < α < 150°. In this way, the stress at the positions of the fourth magnetic slot 21 and the fifth magnetic slot 22 can be reduced to a certain extent.

[0162] In some embodiments of the present application, in the axial direction of the rotor main body 1011, the sum S of the cross-sectional areas of the fourth magnetic slot 21 and the fifth magnetic slot 22 respectively satisfies: 16mm 2 <S < 25mm 2 .

[0163] Due to the poor heat conduction of the amorphous rotor assembly, a relatively large heat dissipation area is required for heat dissipation. Since the stress at the positions of the fourth magnetic slot 21 and the fifth magnetic slot 22 is small, the heat dissipation capacity of the motor can be improved by increasing the sum S of the cross-sectional areas of the fourth magnetic slot 21 and the fifth magnetic slot 22, that is, increasing the cavity area of the fourth magnetic slot 21 and the fifth magnetic slot 22.

[0164] For the rotor assembly 110 provided in the present application, since its magnetic bridge is asymmetrically arranged with respect to the magnetic pole center line L, its magnetic field is asymmetrically arranged with respect to the magnetic pole center line L. Compared with the motor with a symmetric magnetic field in the prior art, in the motor in the embodiments of the present application, as the local magnetic path depth saturation point (magnetic field superposition point) in each sector area 101 moves, and the width of the area where the depth saturation point is located (such as the area where the first magnetic bridge 33 and the second magnetic bridge 34 are located) increases, the overall magnetic path saturation degree is alleviated, the magnetic permeability is increased, the motor inductance is increased, and the reluctance torque is improved to solve the technical problem of the output performance degradation caused by the power output saturation.

[0165] In some embodiments of the present application, the rotor body 1011 further includes an inner wall 32, and the inner wall 32 is close to the rotating shaft side 111; the rotor assembly further includes a rotating shaft hole 40, which extends along the axial direction of the rotor body 1011 and is used to receive and fix the rotating shaft. The inner wall 32 is the wall of the rotating shaft hole 40, and the rotating shaft hole 40 is a multi-keyway structure.

[0166] Among them, designing the rotating shaft hole 40 as a multi-keyway structure can improve the stability of torque output during the high-speed operation of the rotor assembly 110.

[0167] In some embodiments of the present application, the number of magnets included in the rotor assembly 110 is not limited to the first magnet 501, the second magnet 502, the third magnet 503, the fourth magnet 504, and the fifth magnet 505, and may also include a greater number of magnets. Arranging multiple magnets in each sector area 101 of the rotor assembly 110 can ensure the output performance of the motor.

[0168] In some embodiments of the present application, the first magnet 501, the second magnet 502, the third magnet 503, the fourth magnet 504, and the fifth magnet 505 are magnetic steels with permanent magnet properties.

[0169] Please refer to Figure 4 , in some embodiments of the present application, at least one of the first magnet 501, the second magnet 502, the third magnet 503, the fourth magnet 504, and the fifth magnet 505 includes at least two first sub-magnets 51 and at least one second sub-magnet 52. One second sub-magnet 52 is located between two adjacent first sub-magnets 51. The first sub-magnet 51 is a grain boundary penetration magnet, and the second sub-magnet 52 is a thermally deformed magnet.

[0170] In some embodiments of the present application, the first sub-magnet 51 and the second sub-magnet 52 are magnetic steels.

[0171] In some embodiments of the present application, the rotor assembly 110 has multiple magnets, and the types of magnets do not exceed 2 at most. An expansion coating layer (not shown in the figure) is formed on the surface of the magnets. The expansion coating layer can cause the magnets to have an interference fit with the magnetic slots of the rotor body 1011 during the heating process. The types of magnets (magnetic steels) are not limited to bonded magnetic steels and grooved magnetic steels.

[0172] Among them, the grain boundary penetration magnet is made by the grain boundary penetration technology. The grain boundary penetration technology is an advanced magnetic material preparation technology, which is mainly used to improve the performance of neodymium iron boron permanent magnet materials while reducing the usage amount of heavy rare earth elements. This technology coats a thin film containing heavy rare earths (such as dysprosium (Dy) and terbium (Tb), etc.) on the surface of the magnet and performs a diffusion treatment at high temperature, so that the heavy rare earth elements enter the interior of the magnet along the grain boundaries, thereby improving the coercivity and magnetic energy product of the magnet.

[0173] Among them, the thermally deformed permanent magnet is a high-performance neodymium iron boron (Nd-Fe-B) permanent magnet material prepared by a thermally deformed process. The production process of this permanent magnet includes steps such as rapid quenching, crushing, cold pressing, hot pressing, and thermal deformation. During the thermal deformation process, the microstructure of the magnet will change significantly, thereby improving its magnetic properties.

[0174] Among them, the maximum torque of the motor refers to the maximum torque value that the motor can output under specific conditions. According to different motor types and application scenarios, the maximum torque can vary significantly. In the case of the same rotor body 1011, setting a thermally deformed permanent magnet (the second sub-magnet 52) between adjacent grain boundary permeable magnets (the first sub-magnet 51) can increase the maximum torque of the motor, thereby compensating for the disadvantage of the lower maximum torque of the amorphous motor compared to the traditional silicon steel motor. Under the same excitation current, the greater the thermal deformation, the greater the torque of the motor, and the greater the excitation current, the more obvious the influence of the thermal deformation on the motor torque.

[0175] In some embodiments of the present application, the thermally deformed permanent magnet first uses the rapid quenching method, the HDDR method, or the mechanical alloying method to prepare magnetic powder. The magnetic powder is refined and heat-treated to obtain refined magnetic powder. The magnetic powder is cold-pressed to obtain a magnet, and it is hot-pressed. The hot pressing treatment temperature is 550-800 °C, so that the grains grow and rotate to obtain an isotropic permanent magnet, which is consistent with the cavities of the second layer of magnet slots (corresponding to the first sub-magnet 51) and the third layer of magnet slots (corresponding to the first sub-magnet 51). The assembly method of the first sub-magnet 51 and the second sub-magnet 52 is that after heating the rotor body (rotor core), first put in the grain boundary permeable permanent magnet, then put in the thermally deformed permanent magnet, and then put in the grain boundary permeable permanent magnet.

[0176] Please refer to Figure 5 , in some embodiments of the present application, the rotor body 1011 includes a plurality of rotor laminations (not shown in the figure). The plurality of rotor laminations are stacked axially on the rotor body 1011. The stack diameter coefficient of the rotor body 1011 is set between 0.19‰-1.68‰. The stack diameter coefficient of the rotor body 1011 refers to the ratio of the thickness of the rotor body 1011 in the axial direction of the rotor body 1011 to the outer diameter of the rotor body 1011. The outer diameter of the rotor body 1011 refers to the distance between the inner wall 32 and the outer wall 31 of the rotor body 1011.

[0177] Among them, setting the stack diameter coefficient of the rotor body 1011 between 0.19‰-1.68‰ can ensure that the rotor laminations (amorphous laminations) do not have problems such as adhesion and warping, thereby improving the yield rate.

[0178] Please refer to Figure 6, in some embodiments of the present application, the rotor assembly 110 further includes a first coating layer 61 and a second coating layer 62. The first coating layer 61 and the second coating layer 62 respectively cover both ends of the rotor body 1011 in the axial direction of the rotor body 1011. The first coating layer 61 covers at least one of the first magnetic slot 13, the second magnetic slot 14, the third magnetic slot 15, the fourth magnetic slot 21, and the fifth magnetic slot 22. The second coating layer 62 covers the remaining magnetic slots among the first magnetic slot 13, the second magnetic slot 14, the third magnetic slot 15, the fourth magnetic slot 21, and the fifth magnetic slot 22 except those covered by the first coating layer 61.

[0179] In this embodiment, the first coating layer 61 covers the first magnetic slot 13, the third magnetic slot 15, and the fifth magnetic slot 22, and the second coating layer 62 covers the second magnetic slot 14 and the fourth magnetic slot 21.

[0180] Among them, setting the first coating layer 61 and the second coating layer 62 at both ends of the rotor body 1011 can reduce the edge warping phenomenon during the assembly process of the rotor assembly, and can also improve the rotor stiffness.

[0181] In some embodiments of the present application, the first coating layer 61 and the second coating layer 62 can be formed by plastic encapsulation of a polymer material or silicon steel sheets.

[0182] Please refer to Figure 7 and Figure 8 , the present application also provides a motor 100. The motor 100 includes the rotor assembly 110 and the stator assembly 120 as described above, and the stator assembly 120 is disposed around the rotor assembly 110.

[0183] The stator assembly 120 is the stationary part in the motor and is usually composed of a stator core, a stator winding, and a frame. Its main function is to generate a rotating magnetic field. The rotor assembly 110 is the rotating part in the motor and is usually composed of a rotor core, a rotor winding, and a rotating shaft. Its function is to induce an electromotive force in the rotating magnetic field generated by the stator assembly 120 and perform energy conversion through electromagnetic torque. The interaction between the stator assembly 120 and the rotor assembly 110 is the basis for the operation of the motor. When current passes through the stator winding, a magnetic field will be generated in the stator core, and this magnetic field will attract or push the rotor assembly to rotate, thereby realizing the conversion of electrical energy into mechanical energy.

[0184] In some embodiments of the present application, the motor 100 further includes a limit sensor 130. The limit sensor 130 is opposite to the position of the air gap 140 between the stator assembly 120 and the rotor assembly 110, and the limit sensor 130 is used to detect whether the outer diameter deformation amount of the rotor assembly 110 exceeds the standard.

[0185] Among them, the air gap 140 between the stator assembly 120 and the rotor assembly 110 refers to the minimum gap width between the stator assembly and the rotor assembly of the motor. The air gap 140 is a key parameter in the motor design, directly affecting the performance, efficiency, and reliability of the motor. The existence of the air gap 140 is to ensure that the rotor assembly can rotate freely within the cavity of the stator assembly, while avoiding direct contact between the stator assembly and the rotor assembly, thereby reducing friction and wear.

[0186] In some embodiments of the present application, the motor 100 further includes a housing 150. Both the stator assembly 120 and the rotor assembly 110 are located within the housing 150. The limit sensor 130 is disposed on the housing 150. While fixing the limit sensor 130, the space of the motor can be reasonably utilized.

[0187] In some embodiments of the present application, the limit sensor 130 is located 2 - 3 centimeters below the air gap 140 between the stator assembly 120 and the rotor assembly 110.

[0188] In some embodiments of the present application, the limit sensor 130 is a micro proximity switch limit sensor. Of course, the limit sensor 130 can also be other types of limit sensors.

[0189] Among them, the limit sensor 130 detects whether the outer diameter deformation of the rotor assembly 110 of the motor 100 exceeds the standard through infrared rays. It is mainly considered that since the material of the rotor body 1011 of the rotor assembly 110 is amorphous material, and the elastic modulus of the amorphous material is low, there is a risk of stator rubbing and poor dynamic balance during the high-speed rotation of the rotor assembly 110. If it is detected that the outer diameter of the rotor assembly 110 exceeds the standard (the outer diameter exceeds the predetermined value), the operation of the motor 100 is stopped, which can reduce the risk of stator rubbing and poor dynamic balance during the high-speed rotation process.

[0190] Please refer to Figure 9 , the present application also provides a vehicle 1000. The vehicle 1000 includes the motor 100 or the rotor assembly 110 as described above. That is to say, the rotor assembly provided by the present application can be applied not only in the motor, but also in engines, generator systems, in-wheel motor systems, etc., with diverse application scenarios.

[0191] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0192] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not elaborated in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0193] Among the embodiments, implementation manners and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0194] The above are only the preferred embodiments of the present application and do not impose any formal restrictions on the present application. Although the descriptions of the respective embodiments of the present application have their own emphases, for parts not elaborated in a certain embodiment, reference may be made to the relevant embodiments of other embodiments. However, any modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A rotor assembly, characterized in that: include: A rotor body, wherein the rotor body is made of amorphous material, and has a plurality of sector-shaped regions distributed along its circumference, and each of the sector-shaped regions has a magnetic pole centerline along the axial direction of the rotor body; and A plurality of magnetic component groups, each of the sector-shaped regions has one magnetic component group, each of the magnetic component groups can generate a magnetic field in the sector-shaped region where it is located, and the magnetic field is asymmetric along the center line of the magnetic pole.

2. The rotor assembly according to claim 1, characterized in that Each of the fan-shaped regions also has a first magnetic bridge and a second magnetic bridge, and the first magnetic bridge and the second magnetic bridge are asymmetrically arranged about the magnetic pole center line.

3. The rotor assembly according to claim 2, characterized in that Each of the magnetic component groups includes a plurality of magnetic components, and the first magnetic bridge and the second magnetic bridge are respectively located between two adjacent magnetic components; The magnetic bridge widths of the first magnetic bridge and the second magnetic bridge are not equal, and the magnetic bridge width is the shortest distance between two adjacent magnetic components.

4. The rotor assembly according to claim 2, characterized in that: In each of the sector-shaped regions, shapes of the first magnetic bridge and the second magnetic bridge are asymmetric with respect to the magnetic pole center line.

5. The rotor assembly according to claim 2, characterized in that: In each of the sector-shaped regions, a distance from the first magnetic bridge to the magnetic pole center line is greater than a distance from the second magnetic bridge to the magnetic pole center line.

6. The rotor assembly according to claim 5, characterized in that The first magnetic bridge and the second magnetic bridge are respectively located on different sides of the magnetic pole center line.

7. The rotor assembly according to any one of claims 2 to 5, characterized in that: The rotor body has a rotation shaft side; Each of the magnetic component groups includes a first magnetic flux layer and a second magnetic flux layer; the first magnetic flux layer is arranged close to the rotating shaft, and the second magnetic flux layer is arranged spaced apart from the first magnetic flux layer in the radial direction of the rotor body and is located on a side of the first magnetic flux layer away from the rotating shaft; The first magnetic flux layer includes a first magnetic component, a second magnetic component and a third magnetic component. The first magnetic bridge is located between the first magnetic component and the second magnetic component. The second magnetic bridge is located between the second magnetic component and the third magnetic component.

8. The rotor assembly according to claim 7, characterized in that The first magnetic component and the third magnetic component are located on both sides of the magnetic pole center line and are asymmetrically arranged with respect to the magnetic pole center line.

9. The rotor assembly according to claim 8, characterized in that The second magnetic component and the first magnetic component are located on the same side of the magnetic pole centerline; The second magnetic component and the third magnetic component are asymmetrically arranged about the magnetic pole center line.

10. The rotor assembly according to claim 8, wherein: A portion of the second magnetic component is located on the same side of the magnetic pole centerline as the first magnetic component, and another portion of the second magnetic component is located on the same side of the magnetic pole centerline as the third magnetic component; The second magnetic component is asymmetrically arranged about the magnetic pole center line.

11. The rotor assembly according to claim 7, wherein: The first magnetic component includes a first magnet and a first magnetic slot; The second magnetic component includes a second magnet and a second magnetic slot; The third magnetic assembly includes a third magnet and a third magnetic slot; and The first magnetic slot, the second magnetic slot and the third magnetic slot are located in the rotor body, and the first magnet, the second magnet and the third magnet are located in the first magnetic slot, the second magnetic slot and the third magnetic slot respectively; The first magnetic bridge is located between the first magnetic slot and the second magnetic slot, and the second magnetic bridge is located between the second magnetic slot and the third magnetic slot.

12. The rotor assembly according to claim 11, wherein: The first magnetic groove and the third magnetic groove are located on both sides of the magnetic pole center line and are asymmetrically arranged with respect to the magnetic pole center line.

13. The rotor assembly according to claim 12, wherein: The second magnetic groove and the first magnetic groove are located on the same side of the center line of the magnetic pole; The second magnetic groove and the third magnetic groove are arranged asymmetrically with respect to the magnetic pole center line.

14. The rotor assembly according to claim 11, wherein: At least a portion of the second magnetic slot is located on the same side of the magnetic pole centerline as the first magnetic slot; another portion of the second magnetic slot is located on the other side of the magnetic pole centerline as the third magnetic slot; The second magnetic groove is arranged symmetrically or asymmetrically about the magnetic pole center line.

15. The rotor assembly according to claim 11, wherein: The first magnet and the third magnet are located on both sides of the magnetic pole center line and are asymmetrically arranged with respect to the magnetic pole center line.

16. The rotor assembly according to claim 15, wherein: The second magnet and the first magnet are located on the same side of the center line of the magnetic pole; The second magnet and the third magnet are arranged asymmetrically with respect to the magnetic pole center line.

17. The rotor assembly of claim 15, wherein: A portion of the second magnet is located on the same side of the magnetic pole centerline as the first magnet, and another portion of the second magnet is located on the same side of the magnetic pole centerline as the third magnet; Wherein, the second magnet is arranged symmetrically or asymmetrically about the magnetic pole center line.

18. The rotor assembly of claim 11, wherein: The second magnetic flux layer 20 further includes a fourth magnetic component and a fifth magnetic component. The fourth magnetic component and the first magnetic component are located on the same side of the magnetic pole center line, and the fifth magnetic component and the third magnetic component are located on the same side of the magnetic pole center line.

19. The rotor assembly of claim 18, wherein: The fourth magnetic component and the fifth magnetic component are arranged symmetrically or asymmetrically about the magnetic pole center line.

20. The rotor assembly of claim 19, wherein: The fourth magnetic assembly includes a fourth magnetic slot and a fourth magnet, and the fifth magnetic assembly includes a fifth magnetic slot and a fifth magnet; The fourth magnetic slot and the fifth magnetic slot are located in the rotor body, and the fourth magnet and the fifth magnet are located in the fourth magnetic slot and the fifth magnetic slot; and The fourth magnetic slot and the fifth magnetic slot are symmetrically or asymmetrically arranged with respect to the magnetic pole center line; and / or the fourth magnet and the fifth magnet are symmetrically or asymmetrically arranged with respect to the magnetic pole center line.

21. The rotor assembly of claim 20, wherein: The fourth magnetic groove and the first magnetic groove are located on the same side of the magnetic pole center line, and the fifth magnetic groove and the third magnetic groove are located on the same side of the magnetic pole center line; The minimum distance from the fourth magnetic groove to the first magnetic groove is greater than or equal to the minimum distance from the fifth magnetic groove to the third magnetic groove.

22. The rotor assembly of claim 21, wherein: The minimum distance from the fourth magnetic groove to the second magnetic groove is greater than or equal to the minimum distance from the fifth magnetic groove to the third magnetic groove.

23. The rotor assembly of claim 11, wherein: The width ratio of the first magnetic bridge to the second magnetic bridge is 0.7-0.

85.

24. The rotor assembly of claim 23, wherein: The rotor body further includes an outer wall, the outer wall being away from the rotating shaft side; the rotor body further includes: A third magnetic bridge is located between the first magnetic groove and the outer wall; and a fourth magnetic bridge, located between the third magnetic groove and the outer wall; Wherein, the width ratio of the third magnetic bridge to the fourth magnetic bridge is 0.8-0.95; and / or The width ratio of the fourth magnetic bridge to the second magnetic bridge is 0.75-0.

85.

25. The rotor assembly of claim 24, wherein: The widths of the first magnetic bridge, the second magnetic bridge, the third magnetic bridge and the fourth magnetic bridge satisfy: 1.5mm≤L1≤2mm; 1.5mm≤L2≤2mm; 1mm≤L3≤1.5mm; and 1mm≤L4≤1.5mm; wherein L1, L2, L3 and L4 are the widths of the first magnetic bridge, the second magnetic bridge, the third magnetic bridge and the fourth magnetic bridge respectively.

26. The rotor assembly of claim 11, wherein: In the axial direction of the rotor body (1011), the volume of the third magnet located at the rear side in the rotation direction of the rotor assembly is smaller than the sum of the volumes of the first magnet and the second magnet located at the front side in the rotation direction of the rotor assembly.

27. The rotor assembly of claim 26, wherein: The volume V3 of the third magnet, the volume V1 of the first magnet and the volume V2 of the second magnet satisfy: (V1+V2-V3): (V1+V2)<10%~25%.

28. The rotor assembly of claim 20, wherein: The angle between the extension direction of the fourth magnet and the extension direction of the fifth magnet is 120° to 150°.

29. The rotor assembly (110) of claim 20, wherein: The sum of the cross-sectional areas of the fourth magnetic groove and the fifth magnetic groove perpendicular to the axial direction of the rotor body is 16 mm 2 ~25mm 2 .

30. The rotor assembly (110) of claim 11, wherein: At least one of the first magnet, the second magnet and the third magnet includes at least two first sub-magnets and at least one second sub-magnet, and one second sub-magnet is located between two adjacent first sub-magnets.

31. The rotor assembly of claim 30, wherein: The first sub-magnet is a grain boundary permeation magnet, and the second sub-magnet is a thermal deformation magnet.

32. The rotor assembly of claim 20, wherein: The rotor assembly further comprises: a first coating layer; and a second coating layer; Among them, the first covering layer and the second covering layer respectively cover the two ends of the rotor body in the axial direction of the rotor body; the first covering layer covers at least one of the first magnetic groove, the second magnetic groove, the third magnetic groove, the fourth magnetic groove and the fifth magnetic groove; the second covering layer covers the first magnetic groove, the second magnetic groove, the third magnetic groove, the fourth magnetic groove and the fifth magnetic groove, except for the remaining magnetic grooves covered by the first covering layer.

33. The rotor assembly of claim 10, wherein: The rotor body further comprises an inner wall, the inner wall being close to the rotating shaft side; The rotor assembly further includes: a shaft hole extending along the axial direction of the rotor body and used to receive and fix the shaft; Wherein, the inner wall is the wall of the rotating shaft hole, and the rotating shaft hole is a multi-keyway structure.

34. A rotor assembly according to any one of claims 2 to 5, characterized in that The stacking coefficient of the rotor body is set between 0.19‰ and 1.68‰; The stacking coefficient of the rotor body refers to the ratio of the thickness of the rotor body in the axial direction of the rotor body to the outer diameter of the rotor body.

35. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 34.

36. The electric machine according to claim 35, characterized in that Also includes: The stator assembly is arranged around the rotor assembly.

37. The electric machine according to claim 36, characterized in that Also includes: a limit sensor, relative to the air gap position of the stator assembly and the rotor assembly; The limit sensor is used to detect whether the outer diameter deformation of the rotor assembly exceeds the standard.

38. The electric machine according to claim 37, characterized in that Also comprising a housing, wherein the stator assembly and the rotor assembly are located in the housing; Wherein, the limit sensor is arranged on the housing.

39. A vehicle, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 34 or a motor as claimed in any one of claims 35 to 38.

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