Rotor, electric machine, powertrain and vehicle

Abstract

The application relates to a rotor, a motor, a power assembly and a vehicle, the rotor comprising: a rotor core; a plurality of first magnetic bodies arranged circumferentially along the rotor core; wherein a first pole of each of the first magnetic bodies is close to a first pole of an adjacent first magnetic body on one side, and a second pole of each of the first magnetic bodies is close to a first pole of an adjacent first magnetic body on the other side, so as to converge magnetic force lines on one side of the first magnetic body, form a magnetic convergence area, weaken the magnetic force lines on the other side of the first magnetic body, form a magnetic weakening area, enhance the strength of the magnetic field in a unit direction, improve the torque output of the motor, reduce the rotor magnetic density, reduce the hysteresis loss of the rotor, and thus improve the efficiency of the motor and improve the output power and torque density of the motor.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a rotor, motor, powertrain, and vehicle. Background Technology

[0002] Permanent magnet synchronous motors are synchronous motors that use permanent magnet materials as rotor excitation. They have advantages such as simple structure, high power density, low loss, good control performance, and low maintenance cost, and are widely used in the new energy industry.

[0003] Motors typically have multiple permanent magnets arranged around the rotor circumference. However, during use, it has been found that motors based on this technology have low output power and torque density. Utility Model Content

[0004] This application provides a rotor, motor, powertrain, and vehicle that improves the output power and torque density of the motor, thereby at least partially solving the aforementioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a rotor is provided, the rotor comprising:

[0006] Rotor core;

[0007] A plurality of first magnetic bodies are arranged circumferentially along the rotor core; wherein, the first pole of each first magnetic body is close to the first pole of the first magnetic body on the adjacent side, and the second pole of each first magnetic body is close to the first pole of the first magnetic body on the adjacent other side.

[0008] Preferably, the angle between the D axes of two adjacent first magnetic bodies with the first pole close together is θ1, and the angle between the D axes of two adjacent first magnetic bodies with the first pole and the second pole close together is θ2.

[0009] The difference between θ1 and θ2 is less than or equal to 10 degrees.

[0010] Preferably, the difference between θ1 and θ2 is less than or equal to 5 degrees.

[0011] Preferably, at least one of the plurality of first magnetic bodies includes a plurality of first sub-magnetic bodies.

[0012] Preferably, the rotor core has a plurality of first mounting slots along the circumference, and the plurality of first magnetic bodies are respectively disposed in the plurality of first mounting slots.

[0013] Preferably, the rotor core body has a shaft hole and a slot, and the slot connects the shaft hole and the first mounting slot.

[0014] Preferably, the width of the slot is greater than or equal to 0.3 mm.

[0015] Preferably, an enhancing magnetic material is disposed between two adjacent first magnetic materials that are close to each other.

[0016] Preferably, the rotor includes a plurality of magnetic body groups arranged circumferentially along the rotor core, each magnetic body group including a first magnetic body and at least one second magnetic body, the second magnetic body being disposed circumferentially outside the first magnetic body, and the first magnetic body and the second magnetic body being arranged side by side on the D-axis.

[0017] Preferably, the rotor includes a plurality of magnetic body groups arranged circumferentially along the rotor core, each magnetic body group including a first magnetic body, at least one second magnetic body, and at least one third magnetic body.

[0018] The second magnetic body and the third magnetic body are located circumferentially outside the first magnetic body, and the angle between the second magnetic body or the third magnetic body and the D-axis is α, where α ranges from 0 degrees to 70 degrees.

[0019] Preferably, the second magnetic body and the third magnetic body form a V-shaped structure, wherein the open end of the V-shaped structure faces the first magnetic body.

[0020] Preferably, the first pole of the first magnetic body and the second pole of the second magnetic body are close to each other, and the second pole of the first magnetic body and the first pole of the third magnetic body are close to each other; and / or

[0021] The second magnetic body is multiple, and the multiple second magnetic bodies are parallel; and / or

[0022] There are multiple third magnetic bodies, and the multiple third magnetic bodies are parallel to each other; and / or

[0023] At least one of the second magnetic bodies includes a plurality of second sub-magnetic bodies arranged along the length direction, and / or

[0024] At least one of the third magnetic bodies includes a plurality of third sub-magnetic bodies arranged along the length direction; and / or

[0025] The width of the first magnetic bridge between the second magnetic body and / or the third magnetic body and the outer edge of the rotor core is greater than or equal to 0.4 mm; and / or

[0026] The width of the second magnetic bridge between the second magnetic body and / or the third magnetic body is greater than or equal to 0.6 mm; and / or

[0027] The second magnetic body and the third magnetic body have the same thickness, and the thickness of the first magnetic body is greater than or equal to three times the thickness of the second magnetic body or the third magnetic body.

[0028] According to a second aspect of this application, an electric motor is provided, including the said rotor.

[0029] According to a third aspect of this application, a powertrain is provided, including the said rotor or the said motor.

[0030] According to a fourth aspect of this application, a vehicle is provided, including the said rotor, motor, or powertrain.

[0031] This application improves the motor's torque output by bringing the first pole of each first magnetic body close to the first pole of an adjacent first magnetic body, and the second pole of each first magnetic body close to the first pole of an adjacent first magnetic body on the other side. This allows magnetic lines of force to converge on one side of the first magnetic body, forming a magnetically concentrated region, and the magnetic lines of force to weaken on the other side of the first magnetic body, forming a magnetically weak region. This enhances the strength of the magnetic field per unit direction and improves the motor's torque output. Through a reasonable arrangement of magnetic bodies and an optimized magnetic circuit distribution, the rotor's magnetic flux density is reduced, and the rotor's hysteresis loss is decreased, thereby improving the motor's efficiency, increasing the motor's output power and torque density, and solving the technical problem of low output power and torque density in existing motors.

[0032] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0035] Figure 1 This is a schematic diagram of the structure of a rotor provided in an exemplary embodiment of this application;

[0036] Figure 2 yes Figure 1 A schematic diagram of the rotor core structure;

[0037] Figure 3 yes Figure 1 A schematic diagram of the magnetic field lines of the rotor;

[0038] Figure 4 yes Figure 1 A schematic diagram of the magnetic field region of the rotor;

[0039] Figure 5 yes Figure 1 A partially enlarged view of the rotor;

[0040] Figure 6 This is a schematic diagram of the structure of a rotor provided in the exemplary embodiment two of this application;

[0041] Figure 7 This is a schematic diagram of a rotor core provided with a first magnetic body in an exemplary embodiment three of this application;

[0042] Figure 8 This is a schematic diagram of a rotor core provided with a first magnetic body in an exemplary embodiment four of this application;

[0043] Figure 9 This is a schematic diagram of the rotor core of a rotor provided in Exemplary Embodiment 5 of this application;

[0044] Figure 10 This is a schematic diagram of the rotor core of a rotor provided in Exemplary Embodiment Six of this application;

[0045] Figure 11 This is a schematic diagram of the rotor core of a rotor provided in Exemplary Embodiment Seven of this application;

[0046] Figure 12 This is a schematic diagram of the rotor core structure of a rotor provided in the eighth exemplary embodiment of this application;

[0047] Figure 13 This is a schematic diagram of the rotor core structure of a rotor provided in Exemplary Embodiment Nine of this application;

[0048] Figure 14 This is a schematic diagram of a rotor provided in an exemplary embodiment ten of this application, which is provided with a second magnetic body and a third magnetic body;

[0049] Figure 15 This is a schematic diagram of the rotor core structure of a rotor provided in Exemplary Embodiment Eleven of this application.

[0050] Explanation of reference numerals in the attached figures:

[0051] 100. Rotor;

[0052] 101. Rotor core; 10. Mounting slot group; 11. First mounting slot; 111. First mounting sub-slot; 12. Second mounting slot; 121. Second mounting sub-slot; 13. Third mounting slot; 131. Third mounting sub-slot; 14. Reinforcing slot; 15. Shaft hole; 16. Slot opening; 17. First magnetic isolation bridge; 18. Second magnetic isolation bridge;

[0053] 20. First magnetic body; 21. First sub-magnetic body;

[0054] 30. Second magnetic body; 311. Second sub-magnetic body; 31. First end; 32. Second end;

[0055] 40. Third magnetic body; 411. Third sub-magnetic body;

[0056] 50. Enhances magnetic properties. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0058] This application provides a rotor 100, such as Figures 1-5 As shown, Figures 1 to 5 These are, respectively, a structural schematic diagram of the rotor 100 provided in Embodiment 1, a structural schematic diagram of the rotor core 101 of the rotor 100, a schematic diagram of the magnetic field lines of the rotor 100, a schematic diagram of the magnetic field region of the rotor 100, and a schematic diagram of the dimensions of each part of the rotor 100.

[0059] The rotor 100 includes a rotor core 101 and a plurality of first magnetic bodies 20.

[0060] The rotor core 101 forms multiple magnetic pole regions, which are spaced apart circumferentially. Each magnetic pole region is separated from its adjacent pole region by a Q-axis. It should be noted that in this application, the Q-axis and D-axis are virtual axes. The Q-axis corresponds to the quadrature axis in the motor coordinate system, and the D-axis can correspond to the direct axis in the motor coordinate system. The definitions of the direct and quadrature axes are known in the prior art and will not be elaborated upon here.

[0061] Multiple first magnetic bodies 20 are arranged circumferentially on the rotor core 101. That is, each magnetic pole region of the rotor core 101 is provided with a first magnetic body 20, and the number of first magnetic bodies 20 corresponds to the number of magnetic pole regions of the rotor core 101.

[0062] That is, in the circumferential direction, each first magnetic body 20 has two adjacent first magnetic bodies 20 located on both sides respectively. Each first magnetic body 20 has a first pole and a second pole, wherein the first pole is one of the S pole and the N pole, and the second pole is the other of the S pole and the N pole.

[0063] In this configuration, the first pole of each of the first magnetic bodies 20 is close to the first pole of the first magnetic body 20 on the adjacent side, and the second pole of each of the first magnetic bodies 20 is close to the first pole of the first magnetic body 20 on the adjacent other side.

[0064] Assume the first magnetic body 20 in the middle is called A, and the two adjacent first magnetic bodies 20 on both sides are called B and C respectively. The polarity of the side of A adjacent to B and the side of B adjacent to A are the same, let's assume they are both N poles. The polarity of the side of A adjacent to C and the side of C adjacent to A are opposite. Correspondingly, the side of A adjacent to C is the S pole, and the side of C adjacent to A is the N pole.

[0065] Since the polarity of the side of A adjacent to B and the side of B adjacent to A are the same, a magnetic field region will be formed between the D-axis of A and the D-axis of B. However, the polarity of the side of A adjacent to C and the side of C adjacent to A are opposite, so a weak magnetic field region will be formed between the D-axis of A and the D-axis of C.

[0066] Similarly, if D is set on the other side of C, the polarity of the side of C adjacent to D and the side of D adjacent to C are the same. Therefore, a magnetic field concentration region will be formed between the D-axis of C and the D-axis of D. This pattern continues, resulting in an alternating arrangement of magnetic field concentration regions, weak magnetic field regions, and so on, on the rotor 100. In this embodiment, eight first mounting slots 11 and eight first magnetic bodies 20 are used as an example. These eight first magnetic bodies 20 will form four weak magnetic field regions and four strong magnetic field regions, which are alternately arranged. In other embodiments, the number of first magnetic bodies 20 can be set as needed and is not limited here.

[0067] This application improves the motor's torque output by bringing the first pole of each first magnetic body 20 close to the first pole of an adjacent first magnetic body 20, and the second pole of each first magnetic body 20 close to the first pole of an adjacent first magnetic body 20 on the other side. This allows magnetic lines of force to converge on one side of the first magnetic body 20, forming a magnetically concentrated region, and the magnetic lines of force to weaken on the other side of the first magnetic body 20, forming a magnetically weak region. This enhances the strength of the magnetic field per unit direction and improves the motor's torque output. Through a reasonable arrangement of magnetic bodies and an optimized magnetic circuit distribution, the magnetic flux density of the rotor 100 is reduced, and the hysteresis loss of the rotor 100 is decreased, thereby improving the motor's efficiency, increasing the motor's output power and torque density, and solving the technical problem of low output power and torque density in existing motors.

[0068] When multiple first magnetic bodies 20 are provided, the included angle between any two adjacent first magnetic bodies 20 can be set to the same angle, or it can be set to an angle that is not necessarily exactly the same, depending on the needs. In some embodiments, the included angle between the D-axis of two adjacent first magnetic bodies 20 with their first poles close together is θ1, and the included angle between the D-axis of two adjacent first magnetic bodies 20 with their first poles and second poles close together is θ2; wherein the difference between θ1 and θ2 is less than or equal to 10 degrees.

[0069] In other words, θ1 and θ2 can be equal or unequal. Specifically, for example... Figure 4 As shown, in this embodiment, θ1 and θ2 are equal. In other embodiments, θ1 and θ2 are not equal. When θ1 and θ2 are not equal, θ1 can be greater than θ2 or less than θ2, such as... Figure 6 As shown, an example is given where θ1 is greater than θ2. Preferably, the difference between θ1 and θ2 is less than or equal to 5 degrees.

[0070] Specifically, the rotor core 101 has a plurality of first mounting slots 11 arranged circumferentially, the number of first mounting slots 11 corresponding to the number of magnetic pole regions, with one first mounting slot 11 for each magnetic pole region. Correspondingly, a plurality of first magnetic bodies 20 are respectively disposed in the first mounting slots 11. That is, one first magnetic body 20 is disposed in one first mounting slot 11.

[0071] The first mounting slot 11 can include only one slot or multiple sub-slots, such as... Figure 1 and Figure 7 As shown, the example is a first mounting slot 11 comprising a single slot. In other embodiments, the first mounting slot 11 may also include multiple sub-slots. Specifically, at least one of the multiple first mounting slots 11 includes multiple first mounting sub-slots 111, which are arranged side-by-side. Correspondingly, at least one of the multiple first magnetic bodies 20 includes multiple first sub-magnetic bodies 21, which are respectively installed within the multiple first mounting sub-slots 111.

[0072] like Figure 8 As shown, the first mounting slot 11 includes two first mounting sub-slots 111, which are arranged parallel to each other in a direction perpendicular to the D-axis and are symmetrical about the D-axis. Of course, the number of first mounting sub-slots 111 is not limited to two; it can be three, four, etc. Three or four first mounting sub-slots 111 must be arranged parallel to each other in a direction perpendicular to the D-axis. When the number of first mounting sub-slots 111 is three or four, the number of first sub-magnetic bodies 21 is also three or four, respectively.

[0073] Furthermore, to fully utilize the weak magnetic region, an enhancing magnetic body 50 can be installed within the weak magnetic region, specifically between two adjacent first magnetic bodies 20 near the first pole. By installing the enhancing magnetic body 50 within the weak magnetic region, the overall magnetic flux is increased. While ensuring the basic magnetic shielding function of the weak magnetic region, this compensates for magnetic flux losses in the magnetic circuit, further enhancing the overall strength of the air gap magnetic field.

[0074] Correspondingly, when the reinforcing magnetic body 50 is provided in the weak magnetic region, the rotor core 101 is provided with a corresponding reinforcing groove 14, and the reinforcing magnetic body 50 is provided in the reinforcing groove 14.

[0075] In some embodiments, to reduce magnetic leakage between the poles of the first magnetic body 20, the rotor core 101 body is provided with a shaft hole 15 and a slot 16 connecting the shaft hole 15 and the first mounting groove 11. By providing the slot 16 connecting the shaft hole 15 and the first mounting groove 11, the magnetic leakage between the poles of the first magnetic body 20 is reduced.

[0076] Preferably, in order to ensure the effect of reducing magnetic leakage, the width W of the slot 16 is greater than or equal to 0.3mm.

[0077] The second magnetic body 30 and the third magnetic body 40 are described below. In some embodiments, the rotor 100 includes multiple magnetic body groups, each magnetic body group including a first magnetic body 20 and at least one second magnetic body 30. The second magnetic body 30 is disposed circumferentially outside the first magnetic body 20, and the first magnetic body 20 and the second magnetic body 30 are arranged side by side on the D-axis. There may be one or more second magnetic bodies 30; when multiple are used, the multiple second magnetic bodies 30 are arranged in parallel.

[0078] In some embodiments, the rotor 100 includes a plurality of magnetic body groups, each magnetic body group including a first magnetic body 20, at least one second magnetic body 30 and at least one third magnetic body 40, the second magnetic body 30 and the third magnetic body 40 being disposed circumferentially outside the first magnetic body 20.

[0079] The second magnetic body 30 and the third magnetic body 40 are symmetrically arranged on opposite sides of the D-axis. Specifically, the angle between the second magnetic body 30 and the third magnetic body 40 and the D-axis is α, where α ranges from 0 degrees to 70 degrees.

[0080] In other words, the second magnetic body 30 and the third magnetic body 40 constitute at least two structures:

[0081] In the first scenario, when a equals 0, both the second magnetic body 30 and the third magnetic body 40 are simultaneously parallel to the D-axis. For example... Figure 10As shown, the two first ends 31 are close together, and the two second ends 32 are also close together. That is to say, the angle between the line connecting the second end 32 and the first end 31 and the D-axis is 0 degrees.

[0082] In the second case, when 'a' is not equal to 0, the second magnetic body 30 and the third magnetic body 40 form a V-shaped structure. The opening of the V-shaped structure can face outwards or towards the first magnetic body 20; in this embodiment, the opening of the V-shaped structure faces the first magnetic body 20. By setting the opening of the V-shaped structure opposite to the first magnetic body 20, the first magnetic body 20 is protected.

[0083] In other words, the first ends 31 of the second magnetic body 30 and the third magnetic body 40, which are away from the first magnetic body 20, are close together, while the second ends 32 of the second magnetic body 30 and the third magnetic body 40 are far apart. Figure 1 As shown, the two first ends 31 are close together, and the two second ends 32 are far apart. At this time, the angle between the line connecting the second end 32 and the first end 31 and the D-axis should be less than or equal to 70 degrees.

[0084] When the second magnetic body 30 and the third magnetic body 40 form a V-shaped structure, the first pole of the first magnetic body 20 and the second pole of the second magnetic body 30 are close to each other and far away from the first pole of the second magnetic body 30; the second pole of the first magnetic body 20 and the first pole of the third magnetic body 40 are close to each other and far away from the second pole of the third magnetic body 40. That is to say, the first magnetic body 20, the second magnetic body 30 and the third magnetic body 40 adopt a structure in which opposite magnetic poles are adjacent.

[0085] Specifically, such as Figure 3 As shown, assuming the first pole is the S pole and the second pole is the N pole, the S pole of the first magnetic body 20 and the N pole of the second magnetic body 30 are close to each other and far away from the S pole of the second magnetic body 30; the N pole of the first magnetic body 20 and the S pole of the third magnetic body 40 are close to each other and far away from the N pole of the third magnetic body 40.

[0086] like Figure 1 and Figure 11 The diagram illustrates a structure where each magnetic body assembly includes a second magnetic body 30 and a third magnetic body 40. In other embodiments, the magnetic body assembly may be configured to include not only a second magnetic body 30 and a third magnetic body 40.

[0087] Specifically, at least one of the magnetic body groups includes a plurality of the second magnetic bodies 30 or a plurality of the third magnetic bodies 40.

[0088] like Figure 12 As shown, the structure of each magnetic body group includes two second magnetic bodies 30 and two third magnetic bodies 40, as illustrated. Figure 13As shown, a partial magnetic body assembly includes a structure comprising two second magnetic bodies 30 and two third magnetic bodies 40. It is understandable that the number of second magnetic bodies 30 and third magnetic bodies 40 can also be set to three, four, or other numbers; no specific limitation is made.

[0089] The magnetic body assembly includes a plurality of second magnetic bodies 30 and a plurality of third magnetic bodies 40. The plurality of second magnetic bodies 30 may be parallel to each other or not parallel to each other; similarly, the plurality of third magnetic bodies 40 may be parallel to each other or not parallel to each other. Preferably, the plurality of second magnetic bodies 30 are parallel to each other, and the plurality of third magnetic bodies 40 are parallel to each other. Figure 12 As shown, a structure is illustrated where two second magnetic bodies 30 are parallel to each other and two third magnetic bodies 40 are parallel to each other, as follows. Figure 13 As shown, a structure is created where the two second magnetic bodies 30 are not parallel to each other and the two third magnetic bodies 40 are not parallel to each other.

[0090] In this embodiment, the rotor core 101 has multiple mounting slot groups 10 arranged circumferentially, meaning that each magnetic pole region has one mounting slot group 10. Each mounting slot group 10 includes a first mounting slot 11, a second mounting slot 12, and a third mounting slot 13, with the second mounting slot 12 and the third mounting slot 13 located circumferentially outside the first mounting slot 11. A first magnetic body 20 is disposed in the first mounting slot 11, a second magnetic body 30 is disposed in the second mounting slot 12, and a third magnetic body 40 is disposed in the third mounting slot 13.

[0091] The second mounting slot 12 and the third mounting slot 13 can be connected to the first mounting slot 11, or they can be disconnected. Whether or not they are connected can be configured as needed. Figure 2 As shown, both the second mounting slot 12 and the third mounting slot 13 are connected to the first mounting slot 11, as follows. Figure 9 As shown, the second mounting slot 12, the third mounting slot 13 and the first mounting slot 11 are independent of each other and are not connected to each other.

[0092] Furthermore, each of the second magnetic body 30 and the third magnetic body 40 can be a complete magnetic body, such as... Figure 1 , Figure 11 , Figure 12 , Figure 13As shown, each second magnetic body 30 and third magnetic body 40 constitutes a complete magnetic body. In other embodiments, it may also consist of several sub-magnetic bodies. Specifically, at least one second magnetic body 30 includes a plurality of second sub-magnetic bodies 311 arranged along its length, at least one second mounting groove 12 includes a plurality of second mounting sub-grooves 121, and the second sub-magnetic bodies 311 are mounted within the second mounting sub-grooves 121; at least one third magnetic body 40 includes a plurality of third sub-magnetic bodies 411, at least one third mounting groove 13 includes a plurality of third mounting sub-grooves 131, and the third sub-magnetic bodies 411 are mounted within the third mounting sub-grooves 131.

[0093] The second magnetic body 30 and the third magnetic body 40 can both be configured to include multiple sub-magnetic bodies, or only one of them can be configured to include multiple sub-magnetic bodies. Alternatively, each of the second magnetic body 30 or the third magnetic body 40 can be configured to include multiple sub-magnetic bodies, or only some of the second magnetic body 30 or the third magnetic body 40 can be configured to include multiple sub-magnetic bodies; the specific configuration can be determined according to requirements. The second mounting slot 12 and the third mounting slot 13 can be configured accordingly.

[0094] like Figure 14 The diagram illustrates the scenario where each of the second magnetic bodies 30 and the third magnetic body 40 is configured to include two sub-magnetic bodies. Understandably, the number of sub-magnetic bodies is not limited to two; it can be set to more, such as three, four, etc.

[0095] Furthermore, to reduce magnetic leakage, the width A of the first magnetic isolation bridge 17 between the second magnetic body 30 and / or the third magnetic body 40 and the outer edge of the rotor core 101 is greater than or equal to 0.4 mm. That is, the width A of the first magnetic isolation bridge 17 between one of the second magnetic body 30 and / or the third magnetic body 40 and the outer edge of the rotor core 101 is greater than or equal to 0.4 mm, or the width A of the first magnetic isolation bridge 17 between the second magnetic body 30 and / or the third magnetic body 40 and the outer edge of the rotor core 101 is greater than or equal to 0.4 mm. By setting the width A of the first magnetic isolation bridge 17 between the second magnetic body 30 and the third magnetic body 40 and the outer edge of the rotor core 101 to greater than or equal to 0.4 mm, magnetic leakage is reduced.

[0096] Furthermore, to reduce magnetic leakage, the width B of the second magnetic bridge 18 between the second magnetic body 30 and the third magnetic body 40 is greater than or equal to 0.6 mm. That is, the distance between the second magnetic body 30 and / or the third magnetic body 40 is greater than or equal to 0.6 mm. By setting the width B of the second magnetic bridge 18 between the second magnetic body 30 and / or the third magnetic body 40 to greater than or equal to 0.6 mm, magnetic leakage is reduced.

[0097] Specifically, in this embodiment, the first magnetic body 20, the second magnetic body 30, and / or the third magnetic body 40 include permanent magnets. Herein, the first magnetic body 20, the second magnetic body 30, and / or the third magnetic body 40 represent one, two, or all three of them including permanent magnets.

[0098] Specifically, the shapes of the second magnetic body 30 and the third magnetic body 40 can be set as needed, and the second magnetic body 30 and the third magnetic body 40 can be one or more of the following: a straight line shape, a tile shape, etc. Figure 1 The second magnetic body 30 and the third magnetic body 40 are both in a straight line shape, such as... Figure 14 As shown, both the second magnetic body 30 and the third magnetic body 40 are tile-shaped, such as... Figure 15 As described above, some of the second magnetic bodies 30 and the third magnetic body 40 are tile-shaped, while some are straight-lined, meaning that different shapes are used in combination. Of course, the shapes of the second magnetic bodies 30 and the third magnetic body 40 are not limited to straight-lined and tile-shaped; they can also be other shapes, which will not be listed here.

[0099] Specifically, the first magnetic body 20 can be made of materials such as ferrite, iron nitride, AlNiCo magnets, iron-chromium-cobalt permanent magnets, or manganese-based permanent magnets, i.e., non-rare earth materials. By forming a weak magnetic region and a strong magnetic region through the rotor 100, and by setting the first magnetic body 20 to be made of non-rare earth materials such as ferrite, iron nitride, AlNiCo magnets, iron-chromium-cobalt permanent magnets, or manganese-based permanent magnets, not only can the performance of the motor be guaranteed, but costs can also be saved.

[0100] The thickness of the second magnetic body 30 can be the same as or different from the thickness of the third magnetic body 40. In some embodiments, the thickness of the second magnetic body 30 and the third magnetic body 40 are set to be the same, and the thickness of the first magnetic body 20 is set to be greater than or equal to three times the thickness of the second magnetic body 30 or the third magnetic body 40, so as to further improve the output power and torque density of the motor.

[0101] In some embodiments, the rotor core 101 includes multiple laminations stacked axially. Each lamination is provided with a first magnetic body 20, a second magnetic body 30, and a third magnetic body 40. The first magnetic bodies 20 of the multiple laminations may be arranged parallel to each other in the axial direction of the rotor core 101; however, in other embodiments, they may not be arranged parallel to each other, depending on the specific requirements. Similarly, the second magnetic bodies 30 of the multiple laminations may be arranged parallel to each other in the axial direction of the rotor core 101; however, in other embodiments, they may not be arranged parallel to each other. Likewise, the third magnetic bodies 40 of the multiple laminations may be arranged parallel to each other in the axial direction of the rotor core 101; however, in other embodiments, they may not be arranged parallel to each other.

[0102] This application also provides an electric motor that includes the aforementioned rotor 100, which has all the beneficial effects of the aforementioned rotor 100, which will not be repeated here.

[0103] This application also provides a powertrain, which includes the aforementioned rotor 100 or motor. This powertrain possesses all the beneficial effects of the aforementioned rotor 100 or motor, which will not be elaborated further here.

[0104] This application also provides a vehicle that includes the rotor 100, motor, or powertrain as described above, which has all the beneficial effects of the aforementioned rotor 100, motor, or powertrain, which will not be repeated here.

[0105] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0106] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0107] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0108] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A rotor (100), characterized in that, The rotor (100) includes: Rotor core (101); Multiple first magnetic bodies (20) are arranged circumferentially along the rotor core (101); In this configuration, the first pole of each of the first magnetic bodies (20) is close to the first pole of the first magnetic body (20) on the adjacent side, and the second pole of each of the first magnetic bodies (20) is close to the first pole of the first magnetic body (20) on the adjacent other side.

2. The rotor (100) according to claim 1, characterized in that, The angle between the D-axis of two adjacent first magnetic bodies (20) with the first pole close together is θ1, and the angle between the D-axis of two adjacent first magnetic bodies (20) with the first pole and the second pole close together is θ2. The difference between θ1 and θ2 is less than or equal to 10 degrees.

3. The rotor (100) according to claim 2, characterized in that, The difference between θ1 and θ2 is less than or equal to 5 degrees.

4. The rotor (100) according to claim 1, characterized in that, At least one of the plurality of first magnetic bodies (20) includes a plurality of first sub-magnetic bodies (21).

5. The rotor (100) according to claim 1, characterized in that, The rotor core (101) has a plurality of first mounting slots (11) circumferentially arranged, and a plurality of first magnetic bodies (20) are respectively disposed in the plurality of first mounting slots (11).

6. The rotor (100) according to claim 5, characterized in that, The rotor core (101) body has a shaft hole (15) and a slot (16), and the slot (16) connects the shaft hole (15) and the first mounting slot (11).

7. The rotor (100) according to claim 6, characterized in that, The width of the slot (16) is greater than or equal to 0.3 mm.

8. The rotor (100) according to claim 1, characterized in that, An enhancing magnetic material (50) is disposed between two adjacent first magnetic materials (20) that are close to each other.

9. The rotor (100) according to any one of claims 1-8, characterized in that, The rotor (100) includes a plurality of magnetic body groups arranged circumferentially along the rotor core (101). Each magnetic body group includes a first magnetic body (20) and at least one second magnetic body (30). The second magnetic body (30) is arranged circumferentially outside the first magnetic body (20). The first magnetic body (20) and the second magnetic body (30) are arranged side by side on the D-axis.

10. The rotor (100) according to any one of claims 1-8, characterized in that, The rotor (100) includes a plurality of magnetic body groups arranged circumferentially along the rotor core (101), each magnetic body group including a first magnetic body (20), at least one second magnetic body (30) and at least one third magnetic body (40). The second magnetic body (30) and the third magnetic body (40) are located circumferentially outside the first magnetic body (20), and the angle between the second magnetic body (30) or the third magnetic body (40) and the D-axis of the first magnetic body (20) is α, where α ranges from 0 degrees to 70 degrees.

11. The rotor (100) according to claim 10, characterized in that, The second magnetic body (30) and the third magnetic body (40) form a V-shaped structure, wherein the open end of the V-shaped structure faces the first magnetic body (20).

12. The rotor (100) according to claim 10, characterized in that, The first pole of the first magnetic body (20) and the second pole of the second magnetic body (30) are close together, and the second pole of the first magnetic body (20) and the first pole of the third magnetic body (40) are close together; and / or There are multiple second magnetic bodies (30), and the multiple second magnetic bodies (30) are parallel; and / or There are multiple third magnetic bodies (40), and the multiple third magnetic bodies (40) are parallel to each other; and / or At least one of the second magnetic bodies (30) includes a plurality of second sub-magnetic bodies (311) arranged along the length direction, and / or At least one of the third magnetic bodies (40) includes a plurality of third sub-magnetic bodies (411) arranged along the length direction; and / or The width of the first magnetic bridge (17) between the second magnetic body (30) and / or the third magnetic body (40) and the outer edge of the rotor core (101) is greater than or equal to 0.4 mm; and / or The width of the second magnetic bridge (18) between the second magnetic body (30) and / or the third magnetic body (40) is greater than or equal to 0.6 mm; and / or The second magnetic body (30) and the third magnetic body (40) have the same thickness, and the thickness of the first magnetic body (20) is greater than or equal to three times the thickness of the second magnetic body (30) or the third magnetic body (40).

13. An electric motor, characterized in that, Includes the rotor (100) as described in any one of claims 1-12.

14. A powertrain, characterized in that, It includes a rotor (100) as described in any one of claims 1-12, or an electric motor as described in claim 13.

15. A vehicle, characterized in that, It includes a rotor (100) as described in any one of claims 1-12, or an electric motor as described in claim 13, or a powertrain as described in claim 14.

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