Rotor, motor, and electric device

Abstract

The present disclosure relates to a rotor, a motor, and an electric device. The rotor comprises a rotor core, a plurality of first permanent magnets, and a plurality of second permanent magnets. The rotor core is provided with a plurality of first mounting slots and a plurality of second mounting slots, the plurality of first mounting slots and the plurality of second mounting slots are alternately arranged along the circumferential direction of the rotor core, and the depth direction of the mounting slots is the same as the radial direction of the rotor core. The plurality of first permanent magnets are fixed in the plurality of first mounting slots in one-to-one correspondence, and are connected to the inner walls of the first mounting slots close to the axis of the rotor core. The plurality of second permanent magnets are fixed in the plurality of second mounting slots in one-to-one correspondence, and are spaced apart from the inner walls of the second mounting slots close to the axis of the rotor core so as to form air slots. In the present disclosure, the motor can have low magnetic flux leakage, and the air-gap flux density of the motor can be increased, thereby taking into account both the performance and the efficiency of the motor.

Description

Rotors, motors and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411775878.2, filed on December 4, 2024, entitled “Rotor, Motor and Electrical Equipment”, which is incorporated herein by reference in its entirety.

[0002] [Technical Field]

[0003] This disclosure relates to the field of motor technology, and in particular to a rotor, motor and electrical equipment.

[0004] [Background Technology]

[0005] In fields such as electric vehicles and wind power generation, tangential permanent magnet synchronous motor rotors have gradually gained widespread application due to their simple structure and low cost.

[0006] In related technologies, the rotor of a tangential permanent magnet synchronous motor typically includes a rotor core and multiple magnets. The rotor core has multiple mounting slots distributed circumferentially along the rotor core, with the depth direction being the same as the radial direction of the rotor core. Multiple magnets are fixed one-to-one in the multiple mounting slots and are tangentially magnetized. There is a gap between the magnets and the inner wall of the mounting slots near the axis of the rotor core to form air slots, thereby increasing the magnetic resistance between the magnets and the rotor yoke, reducing the leakage flux of the magnets, and improving the efficiency of the tangential permanent magnet synchronous motor.

[0007] However, in the above structure, the length of the magnet in the radial direction of the rotor core is limited, which in turn limits the air gap magnetic flux density of the motor and consequently limits the performance of the motor. How to balance the efficiency and performance of the tangential permanent magnet synchronous motor has become an urgent technical problem to be solved.

[0008] [Summary of the Invention]

[0009] This disclosure provides a rotor, a motor, and an electrical device, which can solve the aforementioned technical problems existing in related technologies. The technical solution is as follows:

[0010] In a first aspect, a rotor is provided, the rotor comprising a rotor core, a plurality of first permanent magnets and a plurality of second permanent magnets;

[0011] The rotor core has a plurality of first mounting slots and a plurality of second mounting slots, which are arranged alternately along the circumference of the rotor core, and the depth direction is the same as the radial direction of the rotor core.

[0012] Multiple first permanent magnets are fixed one-to-one in multiple first mounting slots and are connected to the inner wall of the first mounting slot near the rotor core axis.

[0013] Multiple second permanent magnets are fixed one-to-one in multiple second mounting slots, and are spaced from the inner wall of the second mounting slots near the rotor core axis to form air slots.

[0014] In one possible implementation, the first mounting slot and the second mounting slot have the same depth.

[0015] In one possible implementation, the first permanent magnet has a radial length of L1 in the rotor core, and the second permanent magnet has a radial length of L2 in the rotor core, where 0.75 ≤ L2 / L1 ≤ 0.95.

[0016] In one possible implementation, the inner walls of the air trough and the first mounting trough are parallel to each other.

[0017] In one possible implementation, the distance between the inner walls of the air trough and the first mounting trough that are close to each other is D, where 0.6 mm ≤ D ≤ 0.8 mm.

[0018] In one possible implementation, the second mounting groove has a first protrusion near the inner wall of the first mounting groove, the first protrusion being used to engage with the end of the second permanent magnet near the rotor core axis.

[0019] In one possible implementation, the height of the first protrusion protruding from the inner wall of the second mounting groove is H1, where 0.4mm ≤ H1 ≤ 0.6mm.

[0020] In one possible implementation, the first mounting slot and the second mounting slot are open on the side away from the rotor core axis.

[0021] In one possible implementation, the inner walls of the first mounting groove and the second mounting groove, which are close to each other, each have a second protrusion. The second protrusion in the first mounting groove is used to engage with the end of the first permanent magnet away from the rotor core axis, and the second protrusion in the second mounting groove is used to engage with the end of the second permanent magnet away from the rotor core axis.

[0022] In one possible implementation, the height of the second protrusion protruding from the inner walls of the first and second mounting grooves is H2, where 0.4mm ≤ H2 ≤ 0.6mm.

[0023] In a second aspect, an electric motor is provided, the motor comprising a rotor provided in the first aspect and in possible ways thereof.

[0024] Thirdly, an electrical appliance is provided, the electrical appliance including the motor provided in the second aspect and in possible ways thereof.

[0025] The beneficial effects of the technical solution provided in this disclosure include at least the following:

[0026] In this disclosure, there is a gap between the second permanent magnet and the inner wall of the second mounting slot near the rotor core axis, thereby reducing the magnetic leakage of the portion of the second permanent magnet near the rotor core axis. Furthermore, the portion of the first permanent magnet near the rotor core axis can form an auxiliary circuit with the second permanent magnet, significantly reducing the magnetic leakage of the portion of the first permanent magnet near the rotor core axis. Simultaneously, there is no gap between the first permanent magnet and the inner wall of the first mounting slot near the rotor core axis, and the first permanent magnet has a large radial dimension in the rotor core, enabling the motor to have a large air gap magnetic flux density, thus providing better motor performance. Therefore, this disclosure balances motor efficiency and performance.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0028] [Attached Image Description]

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a schematic diagram of a rotor provided in an embodiment of this disclosure;

[0031] Figure 2 is a partial structural schematic diagram of a rotor provided in an embodiment of this disclosure;

[0032] Figure 3 is a schematic diagram of a rotor provided in an embodiment of this disclosure;

[0033] Figure 4 is a partial structural schematic diagram of a rotor provided in an embodiment of this disclosure;

[0034] Figure 5 is a partial structural schematic diagram of a rotor provided in an embodiment of this disclosure;

[0035] Figure 6 is a magnetometer of an electric motor provided in an embodiment of this disclosure;

[0036] Figure 7 is a magnetic flux density diagram of an electric motor provided by related technologies;

[0037] Figure 8 is a comparison diagram of the air gap magnetic flux density of an electric motor provided in the present disclosure and an electric motor in the related art.

[0038] Figure label:

[0039] 1. Rotor core; 11. First mounting slot; 12. Second mounting slot; 121. Air slot; 122. First protrusion; 13. Second protrusion; 14. Rotor yoke;

[0040] 2. The first permanent magnet;

[0041] 3. Second permanent magnet.

[0042]

Detailed Implementation Methods

[0043] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] In related technologies, the rotor of a tangential permanent magnet synchronous motor typically includes a rotor core and multiple magnets. The rotor core has multiple mounting slots distributed circumferentially along the rotor core, with the depth direction being the same as the radial direction of the rotor core. Multiple magnets are fixed one-to-one in the multiple mounting slots and are tangentially magnetized. There is a gap between the magnets and the inner wall of the mounting slots near the axis of the rotor core to form air slots, thereby increasing the magnetic resistance between the magnets and the rotor yoke, reducing the leakage flux of the magnets, and improving the efficiency of the tangential permanent magnet synchronous motor.

[0046] However, in the above structure, the length of the magnet in the radial direction of the rotor core is limited, which in turn limits the air gap magnetic flux density of the motor and consequently limits the performance of the motor. How to balance the efficiency and performance of the tangential permanent magnet synchronous motor has become an urgent technical problem to be solved.

[0047] To address the aforementioned technical problems, this disclosure provides a rotor, as shown in FIG1. ​​The rotor includes a rotor core 1, a plurality of first permanent magnets 2, and a plurality of second permanent magnets 3. As shown in FIG2, the rotor core 1 has a plurality of first mounting slots 11 and a plurality of second mounting slots 12. The plurality of first mounting slots 11 and the plurality of second mounting slots 12 are staggered along the circumference of the rotor core 1, and the depth direction is the same as the radial direction of the rotor core 1. Referring to FIG1 and FIG2, the plurality of first permanent magnets 2 are fixed one-to-one in the plurality of first mounting slots 11 and are connected to the inner wall of the first mounting slots 11 near the axis of the rotor core 1. The plurality of second permanent magnets 3 are fixed one-to-one in the plurality of second mounting slots 12 and are spaced from the inner wall of the second mounting slots 12 near the axis of the rotor core 1 to form air slots 121.

[0048] In this design, the second permanent magnet 3 is spaced from the inner wall of the second mounting groove 12 near the axis of the rotor core 1, thereby reducing magnetic leakage of the portion of the second permanent magnet 3 near the axis of the rotor core 1. Furthermore, the portion of the first permanent magnet 2 near the axis of the rotor core 1 can form an auxiliary circuit with the second permanent magnet 3, significantly reducing magnetic leakage of the portion of the first permanent magnet 2 near the axis of the rotor core 1. Simultaneously, there is no gap between the first permanent magnet 2 and the inner wall of the first mounting groove 11 near the axis of the rotor core 1, and the first permanent magnet 2 has a larger radial dimension in the rotor core 1, enabling the motor to have a larger air gap magnetic flux density and thus better motor performance. Therefore, this disclosure balances motor efficiency and performance.

[0049] Furthermore, the direct connection between the first permanent magnet 2 and the inner wall of the first mounting groove 11 near the axis of the rotor core 1 can improve the structural strength of the rotor, thereby improving the stability of the rotor during operation.

[0050] Optionally, as shown in Figure 4, the end of the first permanent magnet 2 near the axis of the rotor core 1 is connected to the rotor yoke 14 of the rotor core 1.

[0051] In this way, the length of the first permanent magnet 2 in the radial direction of the rotor core 1 can be maximized, thereby increasing the area of ​​the first permanent magnet 2 in the radial direction of the rotor core 1, which in turn can improve the air gap magnetic flux density between the stator and rotor, thereby improving the performance of the motor. Furthermore, since the end of the first permanent magnet 2 close to the axis of the rotor core 1 is connected to the rotor yoke 14, the stiffness of the rotor can be further improved, thereby improving the stability of the rotor during operation and reducing the vibration and noise of the motor.

[0052] Optionally, the outer surface of the rotor core 1 is arc-shaped, and each arc is concentric.

[0053] This disclosure does not limit the specific structure of the first mounting groove 11 and the second mounting groove 12. For example, the first mounting groove 11 and the second mounting groove 12 may have identical structures, and both the first mounting groove 11 and the second mounting groove 12 may have openings on the side away from the axis of the rotor core 1. As another example, the first mounting groove 11 and the second mounting groove 12 may have different structures, with the first mounting groove 11 having an opening on the side away from the axis of the rotor core 1, and the second mounting groove 12 having a closed side away from the axis of the rotor core 1.

[0054] Optionally, in this embodiment of the present disclosure, the number of permanent magnets in the rotor is between 24 and 36. For example, as shown in Figure 1, the rotor includes 28 permanent magnets, wherein the number of first permanent magnet 2 and second permanent magnet 3 is 14 each. Another example: the rotor includes 26 permanent magnets, wherein the number of first permanent magnet 2 and second permanent magnet 3 is 13 each. Yet another example: the rotor includes 30 permanent magnets, wherein the number of first permanent magnet 2 and second permanent magnet 3 is 15 each. Still another example: the rotor includes 32 permanent magnets, wherein the number of first permanent magnet 2 and second permanent magnet 3 is 16 each.

[0055] This allows the motor to have a larger air gap, improving the motor's efficiency and torque.

[0056] Optionally, the rotor core 1 is formed by stacking multiple silicon steel laminations.

[0057] In this way, compared with the direct injection molding method, the eddy current loss and hysteresis loss in the rotor core 1 can be reduced, thereby greatly improving the efficiency of the motor.

[0058] The materials of the first permanent magnet 2 and the second permanent magnet 3 are not limited in the embodiments disclosed herein. For example, both the first permanent magnet 2 and the second permanent magnet 3 are rare-earth permanent magnets. As another example, both the first permanent magnet 2 and the second permanent magnet 3 are ferrites.

[0059] The present invention does not limit the assembly method of the first permanent magnet 2. For example, the first permanent magnet 2 may be directly inserted into the first mounting groove 11. Another example is that the side wall of the first permanent magnet 2 may be fixedly connected to the inner wall of the first mounting groove 11.

[0060] Similarly, the present invention does not limit the assembly method of the second permanent magnet 3.

[0061] The rotor provided in the embodiments of this disclosure will be further described below with reference to some examples.

[0062] In some examples, as shown in Figure 3, the first mounting slot 11 and the second mounting slot 12 have the same depth.

[0063] The depth of the first mounting groove 11 and the second mounting groove 12 refers to the depth of the first mounting groove 11 and the second mounting groove 12 in the radial direction of the rotor.

[0064] In this way, since the first mounting groove 11 and the second mounting groove 12 have the same depth, and the first permanent magnet 2 is connected to the inner wall of the first mounting groove 11 near the axis of the rotor core 1, and the second permanent magnet 3 is spaced from the inner wall of the second mounting groove 12 near the axis of the rotor core 1, the first permanent magnet 2 can have a larger size, which can greatly improve the air gap magnetic flux density between the stator and rotor and improve the performance of the motor.

[0065] Furthermore, as shown in Figure 3, the length of the first permanent magnet 2 in the radial direction of the rotor core 1 is L1, and the length of the second permanent magnet 3 in the radial direction of the rotor core 1 is L2, where 0.75≤L2 / L1≤0.95.

[0066] If L2 / L1 is less than 0.75, the size of the second permanent magnet 3 will be too small, resulting in a decrease in the air gap magnetic flux density of the motor. If L2 / L1 is greater than 0.95, the distance between the second permanent magnet 3 and the inner wall of the second mounting groove 12 near the axis of the rotor core 1 will be too small, leading to poor magnetic shielding capability of the air groove 121, increased magnetic leakage at the second permanent magnet 3, and consequently, reduced motor efficiency. Maintaining a ratio of 0.75 ≤ L2 / L1 ≤ 0.95 ensures that the second permanent magnet 3 has sufficient size while preventing the distance between it and the inner wall of the second mounting groove 12 near the axis of the rotor core 1 from becoming too small, thus further guaranteeing better motor performance and efficiency.

[0067] Optionally, the value of L2 / L1 can be 0.80, 0.85 or 0.90.

[0068] In other examples, the depth of the first mounting groove 11 is greater than the depth of the second mounting groove 12, and the length L1 of the first permanent magnet 2 in the radial direction of the rotor core 1 is also greater than the length L2 of the second permanent magnet 3 in the radial direction of the rotor core 1.

[0069] In some examples, as shown in Figure 2, the inner walls of the air groove 121 and the first mounting groove 11 are parallel to each other.

[0070] If the inner wall of the air slot 121 near the first mounting slot 11 is in the same depth direction as the second mounting slot 12, the portions of the first mounting slot 11 and the second mounting slot 12 that are far from the axis of the rotor core 1 will have a large gap. This will limit the number of the first mounting slot 11 and the second mounting slot 12, thereby limiting the number of the first permanent magnet 2 and the second permanent magnet 3 that can be installed in the rotor core 1, and consequently limiting the performance of the motor.

[0071] In this embodiment, the inner walls of the air groove 121 and the first mounting groove 11 are parallel and close to each other. This allows for a significant reduction in the spacing between the portions of the first mounting groove 11 and the second mounting groove 12 that are away from the axis of the rotor core 1, while slightly reducing the size of the portion of the second mounting groove 12 used to form the air groove 121. This increases the number of the first mounting groove 11 and the second mounting groove 12 opened in the rotor core 1, thereby increasing the number of the first permanent magnet 2 and the second permanent magnet 3 installed in the rotor core 1. Consequently, it increases the proportion of permanent magnets in the rotor core 1 and improves the performance of the rotor.

[0072] Optionally, the cross-section of the air duct 121 is an isosceles trapezoid.

[0073] In some examples, as shown in Figure 5, the distance between the adjacent inner walls of the air groove 121 and the first mounting groove 11 is D, where 0.6 mm ≤ D ≤ 0.8 mm. Figure 5 is an enlarged view of a portion of the structure shown in Figure 4.

[0074] If the dimension D is less than 0.6 mm, the distance between the inner walls of the air slot 121 and the first mounting slot 11 is too small, which will result in insufficient strength of the rotor core 1. This part may be damaged during the assembly or operation of the motor, thus reducing the service life of the motor. If the dimension D is greater than 0.8 mm, the distance between the inner walls of the air slot 121 and the first mounting slot 11 is too large, which will result in a large gap between the portions of the first mounting slot 11 and the second mounting slot 12 away from the axis of the rotor core 1. This will result in too few first mounting slots 11 and second mounting slots 12, which will limit the number of first permanent magnets 2 and second permanent magnets 3 that can be installed in the rotor core 1, thus limiting the performance of the motor. Ensuring that 0.6 mm ≤ D ≤ 0.8 mm allows for the installation of more permanent magnets in the rotor core 1 while maintaining its strength, thereby improving the motor's performance.

[0075] Optionally, the value of D can be 0.65mm, 0.70mm, or 0.75mm.

[0076] In some examples, as shown in Figure 5, the second mounting groove 12 has a first protrusion 122 near the inner wall of the first mounting groove 11. The first protrusion 122 is used to engage with the end of the second permanent magnet 3 near the axis of the rotor core 1.

[0077] The ends of the permanent magnets are often rounded and chamfered. By setting a first protrusion 122 on the inner wall of the second mounting groove 12, the first protrusion 122 can position the end of the second permanent magnet 3 near the axis of the rotor core 1 during the installation of the second permanent magnet 3, so as to facilitate the installation of the second permanent magnet 3. Furthermore, when the motor is running, the first protrusion 122 can limit the second permanent magnet 3 to prevent the second permanent magnet 3 from moving during the operation, thereby greatly improving the stability of the rotor during operation.

[0078] In some examples, the height of the first protrusion 122 protruding from the inner wall of the second mounting groove 12 is H1, where 0.4mm ≤ H1 ≤ 0.6mm.

[0079] If H1 is less than 0.4mm, the height of the first protrusion 122 protruding from the inner wall of the second mounting groove 12 is too small, which will have several effects. On the one hand, since the ends of permanent magnets often have rounded chamfers, the size of these chamfers may be larger than the size of the first protrusion 122. During motor operation, the second permanent magnet 3 may still move around. On the other hand, the structural strength of the first protrusion 122 is poor, and it may be damaged during motor operation. Furthermore, the processing difficulty of the first protrusion 122 is also greater, which leads to a reduction in rotor production efficiency. If H1 is greater than 0.6mm, the height of the first protrusion 122 relative to the inner wall of the second mounting groove 12 is too large, and the contact area between the second permanent magnet 3 and the first protrusion 122 is too large, which leads to excessive leakage flux in the part of the second permanent magnet 3 near the axis of the rotor core 1, thereby affecting the efficiency of the motor. By ensuring that 0.4mm≤H1≤0.6mm, the second permanent magnet 3 can be prevented from generating large magnetic leakage due to the first protrusion 122 while maintaining the supporting effect of the first protrusion 122 on the second permanent magnet 3.

[0080] Optionally, H1 can be 0.45mm, 0.50mm or 0.55mm.

[0081] In other examples, the second mounting groove 12 has a first snap-fit ​​groove on the inner wall near the first mounting groove 11, and the second permanent magnet 3 has a first snap-fit ​​protrusion on the side wall near the axis of the rotor core 1. When the second permanent magnet 3 is installed inside the rotor core 1, the first snap-fit ​​protrusion is engaged in the first snap-fit ​​groove.

[0082] In some examples, as shown in Figure 5, the first mounting slot 11 and the second mounting slot 12 are open on the side away from the axis of the rotor core 1.

[0083] In this way, on the one hand, the impedance of the first permanent magnet 2 and the second permanent magnet 3 on the side away from the axis of the rotor core 1 can be increased, and the leakage flux of the first permanent magnet 2 and the second permanent magnet 3 on the side away from the axis of the rotor core 1 can be reduced. On the other hand, the first permanent magnet 2 and the second permanent magnet 3 are connected to the air gap between the stator and the rotor, which allows the magnetic flux of the first permanent magnet 2 and the second permanent magnet 3 to enter the air gap between the stator and the rotor, thereby improving the magnetic flux density of the air gap and thus improving the performance of the motor.

[0084] Furthermore, as shown in Figure 5, the inner walls of the first mounting groove 11 and the second mounting groove 12 that are close to each other have second protrusions 13. The second protrusions 13 in the first mounting groove 11 are used to engage with the end of the first permanent magnet 2 away from the axis of the rotor core 1, and the second protrusions 13 in the second mounting groove 12 are used to engage with the end of the second permanent magnet 3 away from the axis of the rotor core 1.

[0085] In this way, during the installation of the first permanent magnet 2 and the second permanent magnet 3, the second protrusion 13 can position the end of the second permanent magnet 3 away from the axis of the rotor core 1, so as to facilitate the installation of the first permanent magnet 2 and the second permanent magnet 3. Furthermore, during motor operation, the second protrusion 13 can limit the first permanent magnet 2 and the second permanent magnet 3 to prevent them from shifting during operation, thereby greatly improving the stability of the rotor during operation.

[0086] Furthermore, as shown in Figure 5, the height of the second protrusion 13 protruding from the inner wall of the first mounting groove 11 and the second mounting groove 12 is H2, 0.4mm≤H2≤0.6mm.

[0087] If H2 is less than 0.4mm, the height of the second protrusion 13 relative to the inner wall of the second mounting groove 12 is too small. On the one hand, since the ends of permanent magnets often have rounded chamfers, the size of these chamfers may be larger than the size of the second protrusion 13. During motor operation, the first permanent magnet 2 and the second permanent magnet may still move around. On the other hand, this will result in poor structural strength of the second protrusion 13, which may be damaged during motor operation. Furthermore, it will make the processing of the second protrusion 13 more difficult, thus reducing the production efficiency of the rotor. If H2 is greater than 0.6mm, the size of the opening is too small, which is not conducive to forming magnetic resistance on the parts of the first permanent magnet 2 and the second permanent magnet 3 that are away from the axis of the rotor core 1. This will result in excessive leakage flux of the first permanent magnet 2 and the second permanent magnet 3, which will in turn affect the efficiency of the motor. By ensuring that 0.4mm≤H2≤0.6mm, the first permanent magnet 2 and the second permanent magnet 3 can be supported by the second protrusion 13, while avoiding large magnetic leakage of the first permanent magnet 2 and the second permanent magnet 3 due to the second protrusion 13 being too large.

[0088] Optionally, the value of H2 can be 0.45mm, 0.50mm or 0.55mm.

[0089] In other examples, the first mounting slot 11 and the second mounting slot 12 are closed on the side away from the axis of the rotor core 1.

[0090] In other examples, the inner walls of the first mounting groove 11 and the second mounting groove 12 that are close to each other have a second snap-fit ​​groove, and the side walls of the first permanent magnet 2 and the second permanent magnet 3 that are away from the axis of the rotor core 1 have a second snap-fit ​​protrusion. When the first permanent magnet 2 and the second permanent magnet 3 are installed on the rotor core 1, the second snap-fit ​​protrusion is engaged in the second snap-fit ​​groove.

[0091] The working principle of the rotor provided in this embodiment is as follows:

[0092] The rotor permanent magnets are radially magnetized, and the polarities of adjacent permanent magnets are opposite, thus forming a closed magnetic circuit with the rotor core 1, the radial air gap between the stator and rotor, and the stator core.

[0093] The specific main magnetic flux path is as follows: first permanent magnet 2 (second permanent magnet 3) → adjacent rotor core pole → radial air gap between stator and rotor → stator core → radial air gap between stator and rotor → adjacent rotor core pole → adjacent second permanent magnet 3 (first permanent magnet 2). When the stator winding is energized according to a certain logic, the stator generates a rotating magnetic field under the above magnetic flux path, and the rotor rotates and outputs torque under the action of the rotating magnetic field generated by the stator.

[0094] As shown in Figure 6, in this embodiment of the present disclosure, the portion of the first permanent magnet 2 near the axis of the rotor core 1 can form an auxiliary circuit with the second permanent magnet 3, thereby significantly reducing the leakage flux of the portion of the first permanent magnet 2 near the axis of the rotor core 1. Referring to Figures 6 and 7, it can be seen that the rotor provided in this embodiment of the present disclosure has a larger air gap magnetic flux density compared to related technologies. Therefore, using the rotor provided in this embodiment of the present disclosure, the motor can have better performance.

[0095] As shown in Figure 8, after applying a rotor provided in this embodiment, the motor has a significantly improved average air gap magnetic flux density. Compared with the solutions provided by related technologies, the average air gap magnetic flux density of the motor is increased by 8%, and its performance is greatly improved.

[0096] Based on the same concept, this disclosure also provides an electric motor, which includes the rotor mentioned above.

[0097] The motor also includes a stator, which consists of a stator core and windings. The stator core is fitted around the outside of the rotor. The stator core includes a stator yoke and multiple stator teeth, each connected to the stator yoke. Multiple windings are wound around the multiple stator teeth. When alternating current is applied to the windings, the rotor can rotate under the action of electromagnetic induction, thereby driving the shaft to rotate.

[0098] Based on the same concept, this disclosure also provides an electrical device, which includes the motor mentioned above.

[0099] Optionally, the electrical equipment may be a wind turbine or a refrigerator, etc., and this disclosure does not limit this.

[0100] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0101] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0102] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0103] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0104] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0105] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A rotor, wherein, The rotor includes a rotor core (1), a plurality of first permanent magnets (2) and a plurality of second permanent magnets (3). The rotor core (1) has a plurality of first mounting slots (11) and a plurality of second mounting slots (12). The plurality of first mounting slots (11) and the plurality of second mounting slots (12) are arranged alternately along the circumference of the rotor core (1), and the depth direction is the same as the radial direction of the rotor core (1). Multiple first permanent magnets (2) are fixed in multiple first mounting slots (11) in a one-to-one correspondence, and are connected to the inner wall of the first mounting slot (11) near the axis of the rotor core (1); Multiple second permanent magnets (3) are fixed in multiple second mounting slots (12) in a one-to-one correspondence, and are spaced from the inner wall of the second mounting slots (12) near the axis of the rotor core (1) to form an air slot (121).

2. The rotor according to claim 1, wherein, The first mounting groove (11) and the second mounting groove (12) have the same depth.

3. The rotor according to claim 2, wherein, The length of the first permanent magnet (2) in the radial direction of the rotor core (1) is L1, and the length of the second permanent magnet (3) in the radial direction of the rotor core (1) is L2, 0.75≤L2 / L1≤0.

95.

4. The rotor according to claim 1, wherein, The inner walls of the air groove (121) and the first mounting groove (11) are parallel to each other.

5. The rotor according to claim 3, wherein, The distance between the inner walls of the air groove (121) and the first mounting groove (11) that are close to each other is D, where 0.6mm≤D≤0.8mm.

6. The rotor according to claim 1, wherein, The second mounting groove (12) has a first protrusion (122) near the inner wall of the first mounting groove (11), and the first protrusion (122) is used to engage with the end of the second permanent magnet (3) near the axis of the rotor core (1).

7. The rotor according to claim 6, wherein, The height of the first protrusion (122) protruding from the inner wall of the second mounting groove (12) is H1, 0.4mm≤H1≤0.6mm.

8. The rotor according to claim 1, wherein, The first mounting groove (11) and the second mounting groove (12) are open on the side away from the axis of the rotor core (1).

9. The rotor according to claim 8, wherein, The inner walls of the first mounting groove (11) and the second mounting groove (12) that are close to each other have a second protrusion (13). The second protrusion (13) in the first mounting groove (11) is used to engage with the end of the first permanent magnet (2) away from the axis of the rotor core (1). The second protrusion (13) in the second mounting groove (12) is used to engage with the end of the second permanent magnet (3) away from the axis of the rotor core (1).

10. The rotor according to claim 9, wherein, The second protrusion (13) protrudes from the inner wall of the first mounting groove (11) and the second mounting groove (12) at a height of H2, 0.4mm≤H2≤0.6mm.

11. An electric motor, wherein, The motor includes the rotor as described in any one of claims 1-10.

12. An electrical appliance, wherein, The electrical equipment includes the motor as described in claim 11.

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