Motor and vehicle

Abstract

The utility model discloses a motor and a vehicle, and belongs to the technical field of motors and vehicles. The motor comprises a rotor iron core and a stator iron core, the rotor iron core is sleeved on the inner circumference of the stator iron core, an air gap is formed between the rotor iron core and the stator iron core, the rotor iron core is provided with a first side face facing the stator iron core, the first side face is provided with a first auxiliary groove and a second auxiliary groove, and the first auxiliary groove and the second auxiliary groove are arranged at intervals in the circumferential direction of the rotor iron core, and the maximum groove depth of the second auxiliary grooves is greater than the maximum groove depth of the first auxiliary grooves, so that the magnetic conductive performance of the stator core can be improved, the efficiency of the motor can be improved, the air-gap magnetic field order torque fluctuation and the radial electromagnetic force density level of the motor can be obviously reduced, the NVH performance of the motor can be improved, and relatively low output torque and power of the motor can be avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of motors and vehicles, and in particular, relates to a motor and a vehicle. Background Art

[0002] During the operation of the drive motor, the torque fluctuations caused by alternating torques such as electromagnetic force waves generated by changes in air gap magnetic density, cogging torque and current ripple will be coupled with the stator breathing mode and rotor torsion mode respectively, and transmitted to the housing through the stator teeth and rotor bearings, thereby generating electromagnetic noise and causing NVH complaints.

[0003] In the prior art, motor manufacturers mainly optimize the NVH performance of motors by slotting the rotors. However, the slots opened on the rotor surface are deep and have large openings. Although this can improve the NVH performance of the motor, it will result in lower output torque and power of the motor. How to strike a balance between the two is an issue that needs to be addressed urgently. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a motor and a vehicle, so that the motor output torque and power can be prevented from being low while improving the NVH performance of the motor.

[0005] In a first aspect, the present application provides a motor, comprising:

[0006] stator core;

[0007] A rotor core is sleeved on the inner circumference of the stator core and forms an air gap with the stator core. The rotor core has a first side surface facing the stator core. The first side surface is provided with a first auxiliary slot and a second auxiliary slot. The first auxiliary slot and the second auxiliary slot are spaced apart along the circumferential direction of the rotor core, wherein the maximum slot depth of the second auxiliary slot is greater than the maximum slot depth of the first auxiliary slot.

[0008] According to the motor of the present application, by providing the first auxiliary groove and the second auxiliary groove on the first side of the rotor core facing the stator core, and making the maximum groove depth of the second auxiliary groove greater than the maximum groove depth of the first auxiliary groove, it is helpful to reduce the weight of the rotor core, reduce iron loss, and improve the efficiency of the motor. In addition, the magnetic conductivity of the rotor core can be increased, the torque fluctuation of the air gap magnetic field order and the radial electromagnetic force density level of the motor can be significantly reduced, the NVH performance of the motor can be improved, and the motor output torque and power can be avoided to be low. In addition, the presence of the first auxiliary groove and the second auxiliary groove increases the heat dissipation area inside the motor, which helps to better dissipate heat, prevent the motor from overheating, and thus improve its operating stability and life. Through improved heat dissipation performance and optimized magnetic field distribution, the efficiency of the motor can be significantly improved. This can not only reduce energy consumption, but also improve the overall performance of the motor. By enhancing structural stability and optimizing magnetic field distribution, the wear and stress of the motor during operation can be reduced, thereby extending the service life of the motor.

[0009] According to one embodiment of the present application, at least two first auxiliary slots are provided, and the at least two first auxiliary slots are symmetrically distributed about a first radial direction of the rotor core; and / or,

[0010] At least two second auxiliary slots are provided, and the at least two second auxiliary slots are symmetrically distributed about a first radial direction of the rotor core; and / or,

[0011] Along the circumferential direction of the rotor core, at least a portion of the inner wall surface of the second auxiliary slot is a circular arc surface; and / or,

[0012] Each of the first auxiliary grooves is an arc-shaped auxiliary groove.

[0013] According to one embodiment of the present application, the at least two first auxiliary slots and the at least two second auxiliary slots together constitute an auxiliary slot unit, a plurality of the auxiliary slot units are provided, and the plurality of the auxiliary slot units are arranged at intervals along the circumferential direction of the rotor core.

[0014] According to one embodiment of the present application, the rotor core is provided with a plurality of first magnetic steel slot groups, the plurality of first magnetic steel slot groups are arranged near the edge of the rotor core and are arranged at intervals along the circumference of the rotor core, each of the first magnetic steel slot groups includes two first magnetic steel slots arranged at intervals along the circumference of the rotor core, the two first magnetic steel slots are arranged symmetrically about the first radial direction of the rotor core, and a first permanent magnet is embedded in each of the first magnetic steel slots.

[0015] According to one embodiment of the present application, the rotor core has a first core segment between the two first magnetic steel slots, and the first core segment is provided with the at least two first auxiliary slots; and / or,

[0016] The second auxiliary groove is disposed adjacent to the first magnetic steel groove.

[0017] According to one embodiment of the present application, the rotor core is further provided with a plurality of second magnetic steel slot groups, and the plurality of second magnetic steel slot groups are arranged in one-to-one correspondence with the plurality of first magnetic steel slot groups, each of the second magnetic steel slot groups is arranged close to the inner side of the rotor core, and includes two second magnetic steel slots arranged at intervals along the circumferential direction of the rotor core, the two second magnetic steel slots are located on both sides of the corresponding first magnetic steel slot groups, and the two second magnetic steel slots are symmetrically arranged about the first radial direction, and a second permanent magnet is embedded in each of the second magnetic steel slots.

[0018] According to one embodiment of the present application, the rotor core has a second core segment between the second magnetic steel slots and the corresponding first magnetic steel slots, and the two second core segments corresponding to each second magnetic steel slot group are provided with the at least two second auxiliary slots.

[0019] According to one embodiment of the present application, along the direction from the first magnetic steel groove to the second magnetic steel groove, the inner wall surface of the second auxiliary groove includes a first arc surface and a second arc surface connected in sequence, and the radius of the first arc surface is greater than the radius of the second arc surface.

[0020] According to one embodiment of the present application, the first arc surface and the second arc surface are connected by smooth transition.

[0021] According to one embodiment of the present application, the stator core includes a plurality of stator teeth spaced apart along its circumference, each of the stator teeth has a second side surface facing the rotor core, and each of the second side surfaces is provided with a groove.

[0022] According to one embodiment of the present application, the groove is an arc groove.

[0023] According to one embodiment of the present application, the center line of the circular arc slot is arranged colinearly with the center line of the corresponding stator tooth.

[0024] In a second aspect, the present application provides a vehicle, the vehicle comprising the motor as described above, the motor comprising:

[0025] stator core;

[0026] A rotor core is sleeved on the inner circumference of the stator core and forms an air gap with the stator core. The rotor core has a first side surface facing the stator core. The first side surface is provided with a first auxiliary slot and a second auxiliary slot. The first auxiliary slot and the second auxiliary slot are spaced apart along the circumferential direction of the rotor core, wherein the maximum slot depth of the second auxiliary slot is greater than the maximum slot depth of the first auxiliary slot.

[0027] According to the vehicle of the present application, by providing the first auxiliary slot and the second auxiliary slot on the first side of the rotor core facing the stator core, and making the maximum slot depth of the second auxiliary slot greater than the maximum slot depth of the first auxiliary slot, it is helpful to reduce the weight of the rotor core, reduce iron loss, and improve the efficiency of the motor. In addition, the magnetic conductivity of the rotor core can be increased, the torque fluctuation of the air gap magnetic field order and the radial electromagnetic force density level of the motor can be significantly reduced, the NVH performance of the motor can be improved, and the motor output torque and power can be avoided to be low. In addition, the presence of the first auxiliary slot and the second auxiliary slot increases the heat dissipation area inside the motor, which helps to better dissipate heat, prevent the motor from overheating, and thus improve its operating stability and life. Through improved heat dissipation performance and optimized magnetic field distribution, the efficiency of the motor can be significantly improved. This can not only reduce energy consumption, but also improve the overall performance of the motor. By enhancing structural stability and optimizing magnetic field distribution, the wear and stress of the motor during operation can be reduced, thereby extending the service life of the motor.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 is a schematic diagram of the structure of the motor provided in the embodiment of the present application;

[0031] Figure 2 yes Figure 1 The schematic diagram of the structure of the motor (partial structure);

[0032] Figure 3 yes Figure 2 A partial enlarged schematic diagram in the middle;

[0033] Figure 4 It is a schematic diagram comparing the order torque fluctuation of a motor provided with an auxiliary slot unit according to an embodiment of the present application and a conventional motor not provided with an auxiliary slot unit;

[0034] Figure 5 It is a schematic diagram comparing the order radial electromagnetic force density corresponding to the breathing mode point of the motor provided with the auxiliary slot unit provided in the embodiment of the present application and the existing motor without the auxiliary slot unit;

[0035] Figure 6 It is a schematic diagram comparing the output torque of a motor provided with an auxiliary slot unit according to an embodiment of the present application and an existing motor not provided with an auxiliary slot unit.

[0036] Reference numerals:

[0037] Motor 100;

[0038] Rotor core 110, first side surface 111, first auxiliary slot 11211, second auxiliary slot 11221, first arc surface 112211, second arc surface 112212, first magnetic steel slot group 113, first magnetic steel slot 1131, first permanent magnet 1132, first core segment 114, second magnetic steel slot group 115, second magnetic steel slot 1151, second permanent magnet 116, second core segment 117;

[0039] stator core 120, stator teeth 121, second side surface 1211, groove 1212;

[0040] Air gap a, first radial direction b. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0042] Reference below Figure 1-Figure 3 A motor according to an embodiment of the present application is described.

[0043] The motor 100 includes a rotor core 110 and a stator core 120 .

[0044] It should be noted that the rotor core 110 is an important part of the magnetic circuit of the motor 100, and forms a complete magnetic circuit together with the stator core 120. At the same time, the rotor core 110 fixes the rotor winding through the slots thereon, so that the winding can rotate in the magnetic field.

[0045] When the winding of the motor 100 is energized, the current generates a magnetic field. This magnetic field generates magnetic flux in the rotor core 110. These magnetic fluxes form a closed magnetic circuit in the rotor core 110. The rotor core 110, the excitation winding and the air gap a together constitute the excitation magnetic field of the generator 100. This excitation magnetic field determines the performance of the motor 100.

[0046] The rotor core 110 is sleeved on the inner circumference of the stator core 120, and forms an air gap a with the stator core 120. In this way, the existence of the air gap a can reduce the friction between the rotor core 110 and the stator core 120, reduce internal friction, and thus improve the efficiency of the motor 100. The air gap a can help the motor 100 dissipate heat and prevent performance degradation or damage caused by overheating. Reasonable setting of the size of the air gap a can reduce the noise when the motor 100 is running. In the production process, setting the air gap a can simplify the process flow and improve production efficiency. By reasonably designing the size and shape of the air gap a, the performance and life of the motor 100 can be optimized.

[0047] The rotor core 110 has a first side surface 111 facing the stator core 120, and the first side surface 111 is provided with a first auxiliary slot 11211 and a second auxiliary slot 11221, and the first auxiliary slot 11211 and the second auxiliary slot 11221 are arranged at intervals along the circumference of the rotor core 110, wherein the maximum slot depth of the second auxiliary slot 11221 is greater than the maximum slot depth of the first auxiliary slot 11211, so that it is helpful to reduce the weight of the rotor core 110, reduce iron loss, improve the efficiency of the motor 100, and significantly reduce the air gap magnetic field order torque fluctuation and radial electromagnetic force density level of the motor 100, improve the NVH performance of the motor 100 and avoid the motor output torque and power being low. The design of the first auxiliary slot 11211 and the second auxiliary slot 11221 can affect the magnetic field distribution inside the motor 100. By reasonably designing the size and position of the first auxiliary slot 11211 and the second auxiliary slot 11221, the distribution of the air gap magnetic field can be optimized, thereby improving the efficiency and performance of the motor 100. The presence of the first auxiliary slot 11211 and the second auxiliary slot 11221 increases the heat dissipation area inside the motor 100, which helps to better dissipate heat. This helps prevent the motor 100 from overheating, thereby improving its operating stability and life. Through improved heat dissipation performance and optimized magnetic field distribution, the efficiency of the motor 100 can be significantly improved. This can not only reduce energy consumption, but also improve the overall performance of the motor 100. By enhancing structural stability and optimizing magnetic field distribution, the wear and stress of the motor 100 during operation can be reduced, thereby extending the service life of the motor 100.

[0048] According to the motor 100 of the present application, by providing a first auxiliary slot 11211 and a second auxiliary slot 11221 on the first side 111 of the rotor core 110 facing the stator core 120, and making the maximum slot depth of the second auxiliary slot 11221 greater than the maximum slot depth of the first auxiliary slot 11211, it is helpful to reduce the weight of the rotor core 110, reduce iron loss, and improve the efficiency of the motor 100. In addition, the magnetic conductivity of the rotor core 110 can be increased, the torque fluctuation of the magnetic field order of the air gap a of the motor 100 and the radial electromagnetic force density level can be significantly reduced, the NVH performance of the motor 100 can be improved, and the motor output torque and power can be avoided to be low. In addition, the presence of the first auxiliary slot 11211 and the second auxiliary slot 11221 increases the heat dissipation area inside the motor 100, which helps to better dissipate heat, prevent the motor 100 from overheating, and thus improve its operating stability and life. Through improved heat dissipation performance and optimized magnetic field distribution, the efficiency of the motor 100 can be significantly improved. This can not only reduce energy consumption, but also improve the overall performance of the motor 100. By enhancing the structural stability and optimizing the magnetic field distribution, the wear and stress of the motor 100 during operation can be reduced, thereby extending the service life of the motor 100.

[0049] Reference Figures 1 to 3 In one embodiment, at least two first auxiliary slots 11211 are provided, and at least two first auxiliary slots 11211 are symmetrically distributed about the first radial direction b of the rotor core 110. In this way, the symmetrically distributed first auxiliary slots 11211 can provide better balance, reduce the vibration of the rotor core 110 during rotation, and improve the NVH performance of the motor 100. This design can improve the stability and reliability of the motor 100. The symmetrically distributed first auxiliary slots 11211 can better control the magnetic field distribution inside the motor 100. This helps to improve the efficiency and performance of the motor 100 and reduce the loss of magnetic line cutting. By adding more first auxiliary slots 11211, the heat dissipation area inside the motor 100 can be further increased, thereby improving the heat dissipation efficiency. This is particularly important for high-power motors 100 and helps prevent overheating. The symmetrically distributed design simplifies the production process and reduces production costs. At the same time, this symmetry also helps to improve manufacturing accuracy and product quality. Improved heat dissipation performance and optimized structural design help to improve the efficiency of the motor 100.

[0050] Reference Figures 1 to 3In one embodiment, at least two second auxiliary slots 11221 are provided, and at least two second auxiliary slots 11221 are symmetrically distributed about the first radial direction b of the rotor core 110. In this way, the added second auxiliary slots 11221 can further improve the stability of the rotor core 110. These auxiliary slots can provide additional support and reduce the vibration and deformation of the rotor core 110 during operation. Improve the NVH performance of the motor 100. The symmetrically distributed second auxiliary slots 11221 can better control the magnetic field distribution inside the motor 100. This helps to improve the efficiency and performance of the motor 100 and reduce the loss of magnetic line cutting. The presence of the second auxiliary slots 11221 increases the heat dissipation area inside the motor 100. By providing a plurality of symmetrically distributed second auxiliary slots 11221, heat can be dissipated more evenly, further improving the heat dissipation efficiency. The symmetrically distributed design simplifies the production process and reduces the production cost. At the same time, this symmetry also helps to improve manufacturing accuracy and product quality. Improved heat dissipation performance and optimized structural design help to improve the efficiency of the motor 100 and extend the life of the motor 100.

[0051] Reference Figure 2 and Figure 3 In one embodiment, along the circumference of the rotor core 110, at least part of the inner wall surface of the second auxiliary slot 11221 is an arc surface. In this way, the inner wall surface of the arc surface helps to guide the magnetic lines of force to pass through the core more evenly, reduce magnetic resistance, and improve magnetic flux efficiency, thereby enhancing the magnetic field stability of the motor 100, and further improving the NVH performance of the motor 100. The inner wall surface of the arc surface helps to optimize the magnetic flux path, reduce the generation of eddy currents, reduce eddy current losses, and improve the efficiency of the motor 100. The inner wall surface of the arc surface is simple in design, easy to manufacture and assemble, and reduces production costs and assembly difficulties. The inner wall surface of the arc surface increases the surface area of ​​the core, helps to accelerate heat conduction, improve heat dissipation performance, and enable the motor 100 to operate stably in a high temperature environment. The inner wall surface design of the arc surface can make the rotor core 110 more solid, improve its structural strength, and thus extend the service life of the motor 100.

[0052] It should be noted that, along the circumferential direction of the rotor core 110, at least part of the inner wall surface of the second auxiliary slot 11221 is an arc surface, which is specifically manifested as follows:

[0053] In one embodiment, the inner wall surface of the second auxiliary slot 11221 may be partially a circular arc surface and partially a straight line surface, and the straight line surface is tangent to the circular arc surface. In this way, the combination of the straight line surface and the circular arc surface can better guide the magnetic lines of force through the iron core, reduce magnetic resistance, and improve the efficiency of magnetic flux, thereby enhancing the magnetic field stability of the motor 100 and improving the NVH performance of the motor 100. By optimizing the design of the inner wall surface of the second auxiliary slot 11221, the generation of eddy currents can be further reduced, the eddy current loss can be reduced, and the efficiency of the motor 100 can be improved. The combined design of the straight line surface and the circular arc surface is relatively simple, easy to manufacture and assemble, and reduces the production cost and assembly difficulty. The combination of the straight line surface and the circular arc surface helps to further optimize the distribution of the magnetic field, reduce unnecessary magnetic flux leakage, and thus improve the efficiency of the motor 100.

[0054] It should be noted that, refer to Figure 1 , when the inner wall surface of the second auxiliary slot 11221 includes intersecting straight line surfaces and arc curved surfaces, the deepest part of the second auxiliary slot 11221 is the intersection of the straight line surface and the arc curved surface. In this way, the intersection of the straight line surface and the arc curved surface can better guide the magnetic lines of force through the iron core, reduce magnetic resistance, and improve the efficiency of magnetic flux, thereby enhancing the magnetic field stability of the motor 100 and improving the NVH performance of the motor 100. By optimizing the deepest design of the second auxiliary slot 11221, the generation of eddy currents can be further reduced, the eddy current loss can be reduced, and the efficiency of the motor 100 can be improved. By optimizing the deepest design of the second auxiliary slot 11221, the iron core can be made more solid, its structural strength can be improved, and the service life of the motor 100 can be extended. The intersection of the straight line surface and the arc curved surface helps to further optimize the distribution of the magnetic field, reduce unnecessary magnetic flux leakage, and thus improve the efficiency of the motor 100.

[0055] Reference Figure 2 and Figure 3 In one embodiment, each first auxiliary slot 11211 is an arc-shaped auxiliary slot. In this way, the arc-shaped auxiliary slot helps to guide the magnetic lines of force to pass through the iron core more evenly, reduces magnetic resistance, and improves magnetic flux efficiency, thereby enhancing the magnetic field stability of the motor 100 and improving the NVH performance of the motor 100. The arc-shaped auxiliary slot helps to optimize the magnetic flux path, reduce the generation of eddy currents, reduce eddy current losses, and improve the efficiency of the motor 100. The arc-shaped auxiliary slot is simple in design, easy to manufacture and assemble, and reduces production costs and assembly difficulties. The arc-shaped auxiliary slot increases the surface area of ​​the iron core, helps to accelerate heat conduction, improve heat dissipation performance, and enable the motor 100 to operate stably in a high temperature environment. The arc-shaped auxiliary slot design can make the iron core more solid, improve its structural strength, and thus extend the service life of the motor 100.

[0056] In one embodiment, at least two first auxiliary slots 11211 and at least two second auxiliary slots 11221 together constitute an auxiliary slot unit, and multiple auxiliary slot units are provided, and multiple auxiliary slot units are arranged at intervals along the circumference of the rotor core 110. In this way, by providing multiple auxiliary slot units, the weight of the rotor core 110 is greatly reduced, the iron loss is reduced, and the efficiency of the motor 100 is improved. The design of multiple auxiliary slot units increases the structural strength of the rotor, making it more stable when rotating at high speed, and reducing the instability caused by vibration. In addition, the design of multiple auxiliary slot units helps to optimize the magnetic flux path, reduce magnetic resistance, and thus improve the efficiency of the motor 100. It can significantly reduce the torque fluctuation of the air gap a magnetic field order and the radial electromagnetic force density level of the motor 100, can reduce the noise and vibration caused by mechanical vibration, improve the NVH performance of the motor 100, and can avoid the motor output torque and power being low. The design of the auxiliary slot unit simplifies the manufacturing and assembly process of the rotor, reduces the production cost and assembly difficulty. Multiple auxiliary slot units can further enhance the structural stability of the rotor core 110 and reduce the vibration and deformation of the rotor core 110 during operation. The combined effect of the multiple auxiliary slot units increases the heat dissipation area inside the motor 100. This helps to dissipate heat more evenly and further improves the heat dissipation efficiency. The provision of multiple auxiliary slot units helps to improve the efficiency of the motor 100 and extend the service life of the motor 100.

[0057] Reference Figure 2 and Figure 3 In one embodiment, the rotor core 110 is provided with a plurality of first magnetic steel slot groups 113, which are arranged near the edge of the rotor core 110 and arranged at intervals along the circumference of the rotor core 110. Each first magnetic steel slot group 113 includes two first magnetic steel slots 1131 arranged at intervals along the circumference of the rotor core 110. The two first magnetic steel slots 1131 are arranged symmetrically about the first radial direction b of the rotor core 110. A first permanent magnet 1132 is embedded in each first magnetic steel slot 1131. In this way, the magnetic field strength inside the motor 100 can be enhanced and the efficiency of the motor 100 can be improved. At the same time, the design of circumferentially arranging at intervals along the rotor core 110 can reduce the loss of magnetic line cutting and improve the stability of the magnetic field. The first magnetic steel slot group arranged near the edge of the rotor core 110 helps to improve the heat dissipation performance. By arranging the magnetic steel slot group at the edge of the rotor core 110, the cooling medium can be more effectively utilized and the heat dissipation efficiency can be improved. By designing multiple first magnetic steel slot groups to have the same structure, the production process can be simplified and the production cost can be reduced. At the same time, this design is also helpful to improve manufacturing accuracy and product quality.

[0058] Reference Figure 2 and Figure 3The rotor core 110 has a first core segment 114 between two first magnetic steel slots 1131, and the first core segment 114 is provided with at least two first auxiliary slots 11211, so that the magnetic field strength and stability of the motor 100 can be further enhanced, thereby improving the efficiency and reliability of the motor 100. The design of the first auxiliary slots 11211 increases the surface area of ​​the rotor, helps to accelerate heat conduction, improves heat dissipation performance, and enables the motor 100 to operate stably under high temperature environments. The design of the first auxiliary slots 11211 optimizes the magnetic flux path, reduces magnetic resistance, and thus improves the efficiency of the motor 100. By optimizing the structure of the rotor, the noise and vibration generated by mechanical vibration can be further reduced, and the NVH performance of the motor 100 can be improved. By pre-opening a plurality of first magnetic steel slot groups 113 and first auxiliary slots 11211 in the rotor core 110, the manufacturing and assembly process of the motor 100 can be simplified, and the production cost and assembly difficulty can be reduced. In addition, the structural strength of the rotor core 110 can be increased, and the service life and reliability of the motor 100 can be improved.

[0059] It should be noted that the reliability of the rotor core 110 needs to be ensured. After the first auxiliary slot 11211 is set on the rotor core 110, it is necessary to ensure that the minimum thickness of the first core segment 114 in the radial direction of the rotor core 110 is H2, where H2≥1mm. In this way, the setting of the first auxiliary slot 11211 may affect the structural strength of the rotor core 110. By ensuring that the minimum thickness H2≥1mm of the first core segment 114, the mechanical properties of the rotor core 110 can be ensured, and deformation or fracture of the rotor caused by being too thin can be avoided. The design of the first auxiliary slot 11211 may affect the electrical performance of the motor 100. By ensuring the minimum thickness of the first core segment 114, the stability of the electrical performance can be ensured, and the electrical performance problems caused by the core being too thin can be reduced. The provision of a minimum thickness H2≥1mm can provide clear guidance for the manufacturing process, avoid manufacturing errors or defective products caused by insufficient thickness, and thus improve production efficiency and product quality. By ensuring that the first core segment 114 has sufficient thickness, the service life of the electric machine 100 can be extended and the risk of premature fatigue and failure can be reduced.

[0060] In addition, in other embodiments, the minimum thickness of the first core segment 114, the specific location and depth of the first auxiliary slot 11211, and the opening width of the first auxiliary slot 11211 can be adjusted accordingly according to actual NVH and performance, and this application does not limit this.

[0061] Reference Figure 3In one embodiment, the second auxiliary slot 11221 is disposed adjacent to the first magnetic steel slot 1131. Thus, the second auxiliary slot 11221 is disposed adjacent to the first magnetic steel slot 1131, which helps to further enhance the magnetic field strength and stability of the motor 100, thereby improving the efficiency and reliability of the motor 100. By adjusting the position of the second auxiliary slot 11221, the magnetic flux path can be optimized and the magnetic resistance can be reduced, thereby improving the efficiency and NVH performance of the motor 100. The adjacent arrangement design simplifies the manufacturing and assembly process, reduces production costs and assembly difficulty. By optimizing the position of the second auxiliary slot 11221, the volume and weight of the motor 100 can be further reduced, making it more compact and lightweight.

[0062] Reference Figure 1 The first auxiliary slot 11211 and the second auxiliary slot 11221 are symmetrically distributed with the rotation axis of the rotor core 110 as the midline. In this way, the symmetrical distribution design can better balance the magnetic lines of force, reduce the magnetic resistance and the distortion of the magnetic lines of force, thereby enhancing the magnetic field stability of the motor 100 and optimizing the NVH performance of the motor 100. By achieving a symmetrical distribution, the noise and vibration generated by the uneven magnetic field during the operation of the motor 100 can be reduced. The symmetrical design makes the manufacturing process easier because the same mold or tool can be used to manufacture the slots on both sides, reducing the manufacturing cost and complexity. The symmetrical distribution design helps to optimize the performance and reliability of the motor 100 because it can reduce potential failure points and make the motor 100 run more reliably. The symmetrical distribution design helps to achieve rotor balance, thereby reducing vibration and wear caused by imbalance, and further improving the performance and life of the motor 100.

[0063] Reference Figures 1 to 3In one embodiment, the rotor core 110 is further provided with a plurality of second magnetic steel slot groups 115, and the plurality of second magnetic steel slot groups 115 are arranged one by one with the plurality of first magnetic steel slot groups 113. Each second magnetic steel slot group 115 is arranged close to the inner side of the rotor core 110, and includes two second magnetic steel slots 1151 arranged at intervals along the circumferential direction of the rotor core 110, the two second magnetic steel slots 1151 are located on both sides of the corresponding first magnetic steel slot group 113, and the two second magnetic steel slots 1151 are arranged symmetrically about the first radial direction b, and each second magnetic steel slot 1151 is embedded with a second permanent magnet 116. In this way, by embedding a plurality of second permanent magnets 116 in the rotor core 110, the magnetic field strength and stability of the motor 100 can be further enhanced, thereby improving the efficiency and reliability of the motor 100. Due to the use of the second permanent magnets 116, the number of turns and current of the excitation winding can be reduced, thereby reducing eddy current losses and improving the efficiency of the motor 100. Providing a plurality of second magnetic steel slot groups 115 helps increase the surface area of ​​the rotor, improves the heat conduction efficiency, and helps the motor 100 to operate stably in a high temperature environment. By embedding the second permanent magnets 116 inside the rotor core 110, the volume and weight of the motor 100 can be reduced, making it more compact and lightweight. In addition, the structural strength of the rotor core 110 can be increased, and the service life and reliability of the motor 100 can be improved.

[0064] Reference Figure 2 and Figure 3 The rotor core 110 has a second core segment 117 between the second magnetic steel slot 1151 and the corresponding first magnetic steel slot 1131, and the two second core segments corresponding to each second magnetic steel slot group are provided with at least two second auxiliary slots 11221, so that the magnetic field strength and stability of the motor 100 can be further enhanced, thereby improving the efficiency and reliability of the motor 100. The design of the second auxiliary slot 11221 increases the surface area of ​​the rotor, helps to accelerate heat conduction, improve heat dissipation performance, and enable the motor 100 to operate stably in a high temperature environment. The design of the second auxiliary slot 11221 optimizes the magnetic flux path, reduces magnetic resistance, and thus improves the efficiency of the motor 100. By optimizing the structure of the rotor, the noise and vibration generated by mechanical vibration can be further reduced, and the NVH performance of the motor 100 can be improved. By pre-opening a plurality of second magnetic steel slot groups 115 and second auxiliary slots 11221 in the rotor core 110, the manufacturing and assembly process of the motor 100 can be simplified, and the production cost and assembly difficulty can be reduced. In addition, the structural strength of the rotor core 110 can be increased, thereby improving the service life and reliability of the motor 100.

[0065] It should be noted that the reliability of the rotor core 110 needs to be ensured. After the second auxiliary slot 11221 is set on the rotor core 110, it is necessary to ensure that the minimum thickness of the second core segment 117 in the radial direction of the rotor core 110 is H3, where H3≥1mm. In this way, the setting of the second auxiliary slot 11221 may affect the structural strength of the rotor core 110. By ensuring that the minimum thickness H3 of the second core segment 117 is ≥1mm, the mechanical properties of the rotor core 110 can be ensured, and deformation or fracture of the rotor caused by being too thin can be avoided. The design of the second auxiliary slot 11221 may affect the electrical performance of the motor 100. By ensuring the minimum thickness of the second core segment 117, the stability of the electrical performance can be ensured, and the electrical performance problems caused by the core being too thin can be reduced. The minimum thickness H3≥1mm can provide clear guidance for the manufacturing process, avoid manufacturing errors or defective products caused by insufficient thickness, and thus improve production efficiency and product quality. By ensuring that the second core segment 117 has sufficient thickness, the service life of the motor 100 can be extended and the risk of premature fatigue and failure can be reduced.

[0066] In addition, in other embodiments, the minimum thickness of the second core segment 117, the specific location and depth of the second auxiliary slot 11221, and the opening width of the second auxiliary slot 11221 can be adjusted accordingly according to actual NVH and performance, and the present application does not limit this.

[0067] Reference Figure 3In another embodiment, along the direction from the first magnetic steel slot 1131 to the second magnetic steel slot 1151, the inner wall surface of the second auxiliary slot 11221 includes a first arc surface 112211 and a second arc surface 112212 connected in sequence, and the radius of the first arc surface 112211 is greater than the radius of the second arc surface 112212. In this way, the combination of the first arc surface 112211 and the second arc surface 112212 helps to guide the magnetic lines of force to pass through the iron core more evenly, reduces magnetic resistance, and improves magnetic flux efficiency, thereby enhancing the magnetic field stability of the motor 100, and further improving the NVH performance of the motor 100. By making the radius of the first arc surface 112211 greater than the radius of the second arc surface 112212, the magnetic flux path can be optimized, the generation of eddy currents can be reduced, the eddy current loss can be reduced, and the efficiency of the motor 100 can be improved. The combination of the first arc surface 112211 and the second arc surface 112212 increases the surface area of ​​the iron core, which helps to accelerate heat conduction, improve heat dissipation performance, and enable the motor 100 to operate stably in a high temperature environment. The combination of the first arc surface 112211 and the second arc surface 112212 is simple in design, easy to manufacture and assemble, and reduces production costs and assembly difficulty. By adjusting the radius of the first arc surface 112211 and the second arc surface 112212, the iron core can be made more solid, its structural strength is improved, and the service life of the motor 100 is extended.

[0068] It should be noted that when the inner wall surface of the second auxiliary groove 11221 includes the first arc surface 112211 and the second arc surface 112212, the deepest part of the second auxiliary groove 11221 is the intersection of the first arc surface 112211 and the second arc surface 112212. In this way, the intersection of the first arc surface 112211 and the second arc surface 112212 can better guide the magnetic lines of force through the iron core, reduce magnetic resistance, and improve magnetic flux efficiency, thereby enhancing the magnetic field stability of the motor 100 and improving the NVH performance of the motor 100. By optimizing the deepest design of the second auxiliary groove 11221, the generation of eddy currents can be further reduced, eddy current losses can be reduced, and the efficiency of the motor 100 can be improved. The intersection of the first arc surface 112211 and the second arc surface 112212 is relatively simple in design, easy to manufacture and assemble, and reduces production costs and assembly difficulties. By optimizing the deepest design of the second auxiliary slot 11221, the core can be made more solid, and its structural strength is improved, thereby extending the service life of the motor 100. The intersection of the first arc surface 112211 and the second arc surface 112212 helps to further optimize the distribution of the magnetic field, reduce unnecessary magnetic flux leakage, and thus improve the efficiency of the motor 100.

[0069] In one embodiment, the first arc surface 112211 and the second arc surface 112212 are smoothly transitioned and connected, so that stress concentration can be reduced, material fatigue and potential structural failure risks can be reduced. The smooth transition connection between the first arc surface 112211 and the second arc surface 112212 can reduce energy loss, reduce noise and vibration, and improve the NVH performance of the motor 100. The smoothly transitioned curved surface is easier to achieve through casting, machining or other manufacturing methods, thereby reducing manufacturing costs and complexity. The smooth transition connection between the first arc surface 112211 and the second arc surface 112212 helps to improve the overall strength and rigidity of the rotor core 110. In addition, the smooth curved surface helps to optimize the distribution of the magnetic field and reduce unnecessary magnetic flux leakage, thereby improving the efficiency of the motor 100 and optimizing the NVH performance of the motor 100.

[0070] Reference Figure 1 In one embodiment, along the axis direction of the rotor core 110, the cross section of the second auxiliary slot 11221 is similar to a triangle. In the embodiment of the present application, the cross section of the second auxiliary slot 11221 is similar to an obtuse triangle. Of course, in other embodiments, the cross section of the second auxiliary slot 11221 can also be similar to a square, a diamond, etc., and the present application does not limit this.

[0071] In one embodiment, the stator core 120 includes a plurality of stator teeth 121 arranged at intervals along the circumference thereof, each stator tooth 121 has a second side surface 1211 facing the rotor core 110, and each second side surface 1211 is provided with a groove 1212, which helps to reduce the weight of the core, reduce iron loss, and improve the efficiency of the motor 100. The second side surface 1211 of the stator tooth 121 is provided with a groove 1212, which can increase the magnetic conductivity of the stator core 120 and improve the efficiency of the motor 100. At the same time, the groove 1212 can also play a role in heat dissipation, helping the motor 100 to run stably in a high temperature environment. The provision of the groove 1212 on each stator tooth 121 can significantly reduce the torque fluctuation of the air gap a magnetic field order and the radial electromagnetic force density level of the motor 100, improve the NVH performance of the motor 100, and avoid the motor output torque and power being low.

[0072] It should be noted that the reliability of the stator teeth 121 needs to be ensured. After the grooves 1212 are set on the stator teeth 121, it is necessary to ensure that the minimum thickness of the stator teeth 121 in the radial direction of the stator core 120 is H1, where H1≥0.8mm. In this way, the grooves 1212 are set on the stator teeth 121 to reduce the weight of the teeth, but at the same time, it may also reduce its structural strength. In order to ensure the structural strength of the stator teeth 121, the minimum thickness H1≥0.8mm is stipulated to ensure the mechanical properties of the teeth and prevent the teeth from being broken or deformed due to being too thin. The stator teeth 121 are a key part of the motor 100, and they carry the electrical connections of the motor 100. The minimum thickness is stipulated to ensure the stability of the electrical performance and reduce the risk of increased resistance or poor electrical contact due to too thin teeth. The minimum thickness H1≥0.8mm can provide clear guidance for the manufacturing process, avoid manufacturing errors or defective products due to insufficient thickness, and thus improve production efficiency and product quality. By ensuring that the stator teeth 121 have sufficient thickness, the service life of the motor 100 can be extended and the risk of premature fatigue and failure can be reduced.

[0073] In addition, in other embodiments, the minimum thickness of the stator tooth 121, the specific location and depth of the groove 1212, and the opening width of the groove 1212 can be adjusted accordingly according to actual NVH and performance, and the present application does not limit this.

[0074] Reference Figure 2 and Figure 3 In one embodiment, the groove 1212 is an arc groove, so that the shape of the arc groove helps to guide the magnetic lines of force to pass through the stator core 120 more evenly, thereby improving the magnetic conductivity of the stator core 120. This helps to improve the efficiency of the motor 100. The design of the arc groove can reduce the generation of eddy currents in the stator core 120, thereby reducing eddy current losses and improving the efficiency of the motor 100. The design of the arc groove helps to increase the surface area of ​​the stator core 120, thereby increasing the heat dissipation area, which helps the motor 100 to operate stably in a high temperature environment. The design of the arc groove can make the stator core 120 more solid and improve its structural strength, thereby extending the service life of the motor 100. The design of the arc groove is simple and easy to manufacture and assemble, which helps to reduce production costs and assembly difficulties. In addition, the design of the arc groove can reduce the torque fluctuation and electromagnetic force of the motor 100, reduce the excitation force of the motor 100, and thus improve the NVH performance of the motor 100.

[0075] Reference Figure 3In one embodiment, the center line of the arc groove is arranged in a collinear manner with the center line of the stator tooth 121. Thus, when the center line of the arc groove is arranged in a collinear manner with the center line of the stator tooth 121, the magnetic lines of force can pass through the stator core 120 more directly and evenly, thereby reducing the magnetic resistance and improving the magnetic flux efficiency. This helps to improve the efficiency of the motor 100. Due to the design of the arc groove, when the magnetic lines of force pass through the stator core 120, the generated eddy currents are effectively confined within the arc groove, thereby reducing the eddy current losses and improving the efficiency of the motor 100. The design of the arc groove increases the surface area of ​​the stator core 120, helps to accelerate heat conduction and enhance the heat dissipation performance. This helps the motor 100 to operate stably in a high temperature environment. The design of the arc groove can make the stator core 120 more solid, improve its structural strength, and thus extend the service life of the motor 100. Since the arc groove is simple in design and easy to manufacture and assemble, this helps to reduce production costs and assembly difficulty, and can also reduce the torque fluctuation and electromagnetic force of the motor 100, reduce the excitation force of the motor 100, and thus improve the NVH performance of the motor 100.

[0076] Reference Figures 4 to 6 , the NVH key indicators of the motor 100 provided in the present application, the torque fluctuation and radial electromagnetic force density at 6 times and 12 times of the frequency are significantly reduced, and the output torque reduction is within an acceptable range. The motor 100 is provided with an auxiliary slot unit, and the order torque fluctuation is reduced compared to the existing motor 100 without the auxiliary slot unit. Specifically, the order torque fluctuation of the motor 100 provided with the auxiliary slot unit is reduced by 8% at 6 times the frequency, and the order torque fluctuation of the motor 100 provided with the auxiliary slot unit is reduced by 46% at 12 times the frequency. The order radial electromagnetic force density corresponding to the breathing mode point of the motor 100 provided with the auxiliary slot unit is reduced compared to the existing motor 100 without the auxiliary slot unit. Specifically, the order radial electromagnetic force density corresponding to the breathing mode point of the motor 100 provided with the auxiliary slot unit is reduced by 70% at 6 times the frequency, and the order radial electromagnetic force density corresponding to the breathing mode point of the motor 100 provided with the auxiliary slot unit is reduced by 53% at 12 times the frequency. The output torque of the motor 100 provided with the auxiliary slot unit is reduced compared with the conventional motor 100 not provided with the auxiliary slot unit. Specifically, the output torque of the motor 100 provided with the auxiliary slot unit is reduced by 1.5%.

[0077] In addition, the working principle of the motor 100 provided in the present application is: the radial and tangential electromagnetic excitation force density formula acting on the stator core 120 structure is calculated according to the Maxwell tensor method:

[0078]

[0079]

[0080] Where bn and bt are the radial and tangential components of the magnetic flux density in the air gap a, respectively; uo is the vacuum permeability.

[0081] It can be seen from the above formulas (1) and (2) that the radial and tangential electromagnetic excitation forces are mainly related to the radial and tangential components of the air gap a magnetic flux density. Auxiliary slots are opened on the stator and rotor surfaces to change the trend of the magnetic lines of the motor 100, reduce the air gap a magnetic flux harmonics, and thus reduce the radial electromagnetic force harmonics and tangential torque fluctuations in the air gap a magnetic field of the motor 100. In order to obtain a better NVH effect, the depth and opening of the auxiliary slots on the rotor surface are usually designed to be very deep and large, but the output torque of the motor 100 shows the opposite trend. Combined with the contradiction between the electromagnetic excitation force and the power torque and other performances, the motor 100 proposed in this application can significantly reduce the order torque fluctuation and radial electromagnetic force density level of the air gap a magnetic field of the motor 100, and improve the NVH performance of the motor 100. In addition, the motor 100 proposed in the application has a simple structure, is easy to implement, and has a wide range of applications, and can be used in the fields of drive motors 100, generators 100, compressors, etc.

[0082] In a second aspect, the present application also provides a vehicle, the vehicle comprising the motor 100 as described above.

[0083] According to the vehicle of the present application, by providing the first auxiliary slot 11211 and the second auxiliary slot 11221 on the first side 111 of the rotor core 110 facing the stator core 120, and making the maximum slot depth of the second auxiliary slot 11221 greater than the maximum slot depth of the first auxiliary slot 11211, it is helpful to reduce the weight of the rotor core 110, reduce iron loss, and improve the efficiency of the motor 100. In addition, the magnetic conductivity of the rotor core 110 can be increased, the efficiency of the motor 100 can be improved, the torque fluctuation of the magnetic field order of the air gap a of the motor 100 and the radial electromagnetic force density level can be significantly reduced, the NVH performance of the motor 100 can be improved, and the motor output torque and power can be avoided to be low. In addition, the presence of the first auxiliary slot 11211 and the second auxiliary slot 11221 increases the heat dissipation area inside the motor 100, which helps to better dissipate heat. This helps to prevent the motor 100 from overheating, thereby improving its operating stability and life. Through improved heat dissipation performance and optimized magnetic field distribution, the efficiency of the motor 100 can be significantly improved. This can not only reduce energy consumption, but also improve the overall performance of the motor 100. By enhancing structural stability and optimizing magnetic field distribution, the wear and stress of the motor 100 during operation can be reduced, thereby extending the service life of the motor 100.

[0084] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0086] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0087] In the description of the present application, “plurality” means two or more.

[0088] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0089] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0091] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that: include: stator core; A rotor core is sleeved on the inner circumference of the stator core and forms an air gap with the stator core. The rotor core has a first side surface facing the stator core. The first side surface is provided with a first auxiliary slot and a second auxiliary slot. The first auxiliary slot and the second auxiliary slot are spaced apart along the circumferential direction of the rotor core, wherein the maximum slot depth of the second auxiliary slot is greater than the maximum slot depth of the first auxiliary slot.

2. The motor according to claim 1, characterized in that At least two first auxiliary slots are provided, and the at least two first auxiliary slots are symmetrically distributed about a first radial direction of the rotor core; and / or, At least two second auxiliary slots are provided, and the at least two second auxiliary slots are symmetrically distributed about a first radial direction of the rotor core; and / or, Along the circumferential direction of the rotor core, at least a portion of the inner wall surface of the second auxiliary slot is a circular arc surface; and / or, Each of the first auxiliary grooves is an arc-shaped auxiliary groove.

3. The motor according to claim 2, characterized in that The at least two first auxiliary slots and the at least two second auxiliary slots together constitute an auxiliary slot unit. A plurality of the auxiliary slot units are provided, and the plurality of auxiliary slot units are arranged at intervals along the circumferential direction of the rotor core.

4. The motor according to claim 2 or 3, characterized in that: The rotor core is provided with a plurality of first magnetic steel slot groups, which are arranged near the edge of the rotor core and spaced apart along the circumference of the rotor core, each of the first magnetic steel slot groups includes two first magnetic steel slots spaced apart along the circumference of the rotor core, the two first magnetic steel slots are symmetrically arranged about a first radial direction of the rotor core, and a first permanent magnet is embedded in each of the first magnetic steel slots.

5. The motor according to claim 4, characterized in that The rotor core has a first core segment between the two first magnetic steel slots, and the first core segment is provided with the at least two first auxiliary slots; and / or, The second auxiliary groove is disposed adjacent to the first magnetic steel groove.

6. The motor according to claim 4, characterized in that The rotor core is also provided with a plurality of second magnetic steel slot groups, and the plurality of second magnetic steel slot groups are arranged in one-to-one correspondence with the plurality of first magnetic steel slot groups. Each of the second magnetic steel slot groups is arranged close to the inner side of the rotor core, and includes two second magnetic steel slots arranged at intervals along the circumferential direction of the rotor core. The two second magnetic steel slots are located on both sides of the corresponding first magnetic steel slot group, and the two second magnetic steel slots are arranged symmetrically about the first radial direction, and each of the second magnetic steel slots is embedded with a second permanent magnet.

7. The motor according to claim 6, characterized in that The rotor core has a second core segment between the second magnetic steel slots and the corresponding first magnetic steel slots, and the two second core segments corresponding to each second magnetic steel slot group are provided with the at least two second auxiliary slots.

8. The motor according to claim 6, characterized in that Along the direction from the first magnetic steel groove to the second magnetic steel groove, the inner wall surface of the second auxiliary groove includes a first arc surface and a second arc surface connected in sequence, and the radius of the first arc surface is greater than the radius of the second arc surface.

9. The motor according to claim 8, characterized in that The first arc surface and the second arc surface are connected by smooth transition.

10. The motor according to any one of claims 1 to 3, characterized in that The stator core includes a plurality of stator teeth spaced apart along its circumferential direction, each of the stator teeth has a second side surface facing the rotor core, and each of the second side surfaces is provided with a groove.

11. The motor according to claim 10, characterized in that The groove is a circular arc groove.

12. The motor according to claim 11, characterized in that The center line of the circular arc slot is collinear with the center line of the corresponding stator tooth.

13. A vehicle, characterized in that: Comprising a motor as claimed in any one of claims 1 to 12.

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