Rotor and electric machine

Abstract

The application relates to a rotor and a motor, the motor comprising a rotor core and a plurality of permanent magnets, the rotor core being provided with a plurality of mounting grooves arranged at intervals along a circumferential direction, each mounting groove comprising a first groove part and a second groove part in communication with each other, and the plurality of permanent magnets being arranged in the plurality of mounting grooves in one-to-one correspondence, each permanent magnet comprising a first magnet part and a second magnet part, the first magnet part being fitted in the first groove part, the second magnet part being fitted in the second groove part, the second magnet part being connected to one side of the first magnet part facing the outer contour of the rotor core, and the width of the first magnet part being greater than that of the second magnet part. Thus, by arranging the second magnet part, the proportion of the permanent magnet in the rotor core can be increased, the torque of the motor can be improved, the second magnet part is closer to the stator of the motor, the utilization rate of the second magnet part can be improved, the mechanical strength of the rotor core can be ensured, and the motor performance can be optimized.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a rotor and a motor. Background Art

[0002] In related technologies, for example, the thickness of the air gap between the stator and rotor of an embedded permanent magnet synchronous motor can be controlled within a very small range, and its power density can be higher than that of a motor with a surface-mounted rotor. In order to reduce the magnetic leakage rate and increase the torque density, the embedded permanent magnet synchronous motor generally reduces the width of the magnetic isolation bridge of the permanent magnet slot as much as possible. This means that the permanent magnets must be installed near the periphery of the rotor core, but this arrangement limits the proportion of permanent magnets in the rotor core. Therefore, how to improve the utilization rate of the rotor space has become an urgent problem to be solved. Summary of the Invention

[0003] The present application provides a rotor and a motor to solve the problem of low rotor utilization.

[0004] In a first aspect, the present application provides a rotor.

[0005] In a second aspect, the present application provides a motor comprising the above-mentioned rotor.

[0006] According to the rotor of the embodiment of the present application, the rotor includes a rotor core and a plurality of permanent magnets, the rotor core having a plurality of mounting slots arranged at intervals along the circumferential direction, each of the mounting slots including a first slot portion and a second slot portion connected to each other, a plurality of the permanent magnets being arranged in the plurality of mounting slots one by one, each of the permanent magnets including a first magnet portion and a second magnet portion, the first magnet portion being fitted in the first slot portion, the second magnet portion being fitted in the second slot portion, the second magnet portion being connected to the side of the first magnet portion facing the outer contour of the rotor core, and the width of the first magnet portion being greater than the width of the second magnet portion.

[0007] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0008] According to the rotor of the embodiment of the present application, the permanent magnet accounts for a high proportion in the rotor core, which can improve the torque of the motor, and the second magnet part is closer to the stator of the motor, which can improve the utilization rate of the second magnet part, and can ensure the mechanical strength of the rotor core and optimize the motor performance.

[0009] In some embodiments, the height of the first magnet portion is H1, the height of the permanent magnet is H2, and H1 and H2 satisfy: 0.5≤H1 / H2≤0.99.

[0010] In some embodiments, the width of the permanent magnet is B1, the width of the second magnet portion is B2, and B1 and B2 satisfy: 0.3≤B2 / B1≤0.7.

[0011] In some embodiments, 0.56≤B2 / B1≤0.66.

[0012] In some embodiments, the first groove portion includes a first side wall and a second side wall opposite to each other in a width direction, and the first side wall and the second side wall are away from each other in a direction from the first groove portion to the second groove portion.

[0013] In some embodiments, the plurality of mounting grooves include adjacent first mounting grooves and second mounting grooves, the second side wall of the first mounting groove is adjacent to the first side wall of the second mounting groove, and the second side wall of the first groove portion is parallel to the first side wall of the second groove portion.

[0014] In some embodiments, the mounting slot further includes a third slot portion connected to the first slot portion, and a portion of a side wall of the first slot portion away from the second slot portion protrudes toward the central axis of the rotor core to form the third slot portion.

[0015] In some embodiments, at least one sidewall of the mounting slot away from the central axis of the rotor core is spaced apart from the permanent magnet by a distance H3, and H3 satisfies: 0.05 mm ≤ H3 ≤ 0.3 mm.

[0016] In some embodiments, the second magnet portion includes: a third side wall and a fourth side wall, the third side wall and the fourth side wall are arranged opposite to each other along the width direction, and a fifth side wall, the fifth side wall is connected between the third side wall and the fourth side wall, and the cross-section of the fifth side wall is straight or arc-shaped.

[0017] In some embodiments, the fifth side wall is arc-shaped and the center of the circle where the arc is located is eccentrically arranged relative to the center of the rotor core.

[0018] In some embodiments, the cross-sections of the third side wall and the fourth side wall are both arc-shaped; or the cross-sections of the third side wall and the fourth side wall are straight lines, and the third side wall and the fourth side wall are away from each other in the direction from the second magnet portion to the first magnet portion.

[0019] In some embodiments, the second groove portion is connected to a middle portion of the first groove portion in a width direction.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 A top view of a rotor provided in an embodiment of the present application;

[0025] Figure 2 A top view of a partial structure of a rotor provided in an embodiment of the present application;

[0026] Figure 3 A top view of a permanent magnet and a mounting slot provided in accordance with one embodiment of the present application;

[0027] Figure 4 A top view of a permanent magnet and a mounting slot provided in accordance with another embodiment of the present application;

[0028] Figure 5 A top view of a permanent magnet and a mounting slot provided in yet another embodiment of the present application;

[0029] Figure 6 A top view of a permanent magnet and a mounting slot provided in yet another embodiment of the present application;

[0030] Figure 7 A curve diagram of the ratio B2 / B1 and torque parameters provided in an embodiment of the present application;

[0031] Figure 8 A curve diagram of the ratio B2 / B1 and torque pulsation parameters provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100, rotor;

[0034] 10. Rotor core; 11. Mounting slot; 111. First slot portion; 111a. First side wall; 111b. Second side wall; 112. Second slot portion; 113. First mounting slot; 114. Second mounting slot; 115. Third slot portion;

[0035] 20, permanent magnet; 21, first magnet portion; 22, second magnet portion; 221, third side wall; 222, fourth side wall; 223, fifth side wall;

[0036] 30. Rotating axis. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0039] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "width," "height," "length," "below," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip, a change in posture, or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" may include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0040] In order to solve the technical problems in the prior art, the present application provides a rotor 100 that can improve the torque of the motor, has a high utilization rate of the permanent magnet 20, and has good mechanical strength of the rotor core 10.

[0041] Reference below Figures 1-8 The rotor 100 of the embodiment of the present application is described, and the rotor 100 includes a rotor core 10 and a plurality of permanent magnets 20. The rotor 100 is described below by taking the application of the rotor 100 to a motor as an example, but this does not represent a limitation thereto.

[0042] Specifically, if Figures 1-6 As shown, the rotor core 10 has a plurality of mounting slots 11 arranged at intervals along the circumferential direction. The plurality of mounting slots 11 can be evenly and spaced apart along the circumferential direction of the rotor core 10. Each mounting slot 11 includes a first slot portion 111 and a second slot portion 112 that are connected to each other. A plurality of permanent magnets 20 are arranged in a one-to-one correspondence within the plurality of mounting slots 11. The mounting slots 11 can limit the position of the permanent magnets 20. Each permanent magnet 20 includes a first magnet portion 21 and a second magnet portion 22. The second magnet portion 22 is connected to the side of the first magnet portion 21 facing the outer contour of the rotor core 10, that is, the second magnet portion 22 is connected to the side of the first magnet portion 21 away from the central axis of the rotor core 10. By providing the second magnet portion 22, the proportion of the permanent magnet 20 in the rotor core 10 can be increased, thereby increasing the torque of the motor. At the same time, the second magnet portion 22 is connected to the side of the first magnet portion 21 facing the outer contour of the rotor core 10. Compared with the "I-shaped" permanent magnet in the prior art or the second magnet portion connected to the side of the first magnet portion away from the outer contour of the rotor core, the second magnet portion 22 of the embodiment of the present application can be closer to the stator of the motor to facilitate the interaction between the magnetic field of the stator and the magnetic field of the permanent magnet 20 to increase the torque of the motor, and the utilization rate of the permanent magnet 20 is high.

[0043] In addition, the width of the first magnet portion 21 is greater than the width of the second magnet portion 22. This arrangement can prevent the cross-sectional area of ​​the mounting groove 11 at the outer peripheral wall of the rotor core 10 from being too large and affecting the structural strength of the rotor core 10. Therefore, by making the width of the first magnet portion 21 greater than the width of the second magnet portion 22, it is beneficial to ensure the mechanical strength of the rotor core 10 and ensure the structural reliability of the rotor core 10. The first magnet portion 21 fits in the first groove portion 111, and the second magnet portion 22 fits in the second groove portion 112. For example, the inner sidewall of the first groove portion 111 and the inner sidewall of the second groove portion 112 can be adapted to at least a portion of the outer side surface of the first magnet portion 21 and the outer side surface of the second magnet portion 22, respectively, so as to further improve the utilization rate of the permanent magnet 20.

[0044] According to the rotor 100 of the embodiment of the present application, the ratio of the permanent magnet 20 in the rotor core 10 is high, the torque of the motor can be improved, the second magnet portion 22 is closer to the stator of the motor, the utilization rate of the second magnet portion 22 can be improved, the mechanical strength of the rotor core 10 can be ensured, and the performance of the motor is optimized.

[0045] In some embodiments, as shown in Figure 3-Figure 6 the height of the first magnet portion 21 is H1, the height of the permanent magnet 20 is H2, and H1, H2 satisfy 0.5≤H1 / H2≤0.99. When H1 / H2=0.5, the height of the first magnet portion 21 is the same as the height of the second magnet portion 22, at this time, the second magnet portion 22 can be closer to the stator of the motor, so as to more facilitate to improve the utilization rate of the permanent magnet 20. When H1 / H2=0.99, the height of the first magnet portion is much greater than the height of the second magnet portion 22, at this time, the second magnet portion 22 is far away from the outer contour of the rotor core 10, which can more facilitate to ensure the high mechanical strength of the rotor core 10. For example, H1 / H2=0.7, or H1 / H2=0.8, the height range of the first magnet portion 21 and the permanent magnet 20 set in this way is reasonable, the ratio of the second magnet portion 22 in the rotor core 10 and the high mechanical strength of the rotor core 10 can be considered.

[0046] In some embodiments, as shown in Figure 3-Figure 6 the width of the permanent magnet 20 is B1, and the width of the second magnet portion 22 is B2, and B1, B2 satisfy 0.3≤B2 / B1≤0.7, so as to further consider the ratio of the second magnet portion 22 in the rotor core 10 and the high mechanical strength of the rotor core 10.

[0047] Further, 0.56≤B2 / B1≤0.66, for example, B2 / B1=0.6, or B2 / B1=0.62. It has been verified through experiments that the parameter range set in this way is reasonable, which can increase the torque of the motor while reducing the torque ripple of the motor, not only effectively utilizes the rotor core 10, but also ensures the high utilization rate of the permanent magnet 20, and solves the problem that the torque ripple of the motor of the built-in motor increases with the increase of the amount of the permanent magnet 20.

[0048] In some examples, as shown in Figure 2As shown, the first slot portion 111 includes a first side wall 111a and a second side wall 111b that face each other in the width direction. The first side wall 111a and the second side wall 111b are spaced apart from each other in the direction from the first slot portion 111 to the second slot portion 112. This allows for a larger spacing between the first and second side walls 111a, 111b, and the first magnet portion 21, creating a clearance space. This not only facilitates installation and prevents damage from scratches during installation, but also improves the sinusoidality of the air gap flux density, reduces magnetic leakage, and enhances motor performance.

[0049] Further, if Figure 1 As shown, the multiple mounting slots 11 include adjacent first mounting slots 113 and second mounting slots 114, the second side wall 111b of the first slot portion 111 is adjacent to the first side wall 111a of the second slot portion 112, and the second side wall 111b of the first slot portion 111 is parallel to the first side wall 111a of the second slot portion 112, so as to further reduce magnetic leakage and further improve the performance of the motor.

[0050] In some embodiments, as Figure 3 As shown, the mounting slot 11 further includes a third slot portion 115 connected to the first slot portion 111. A portion of the sidewall of the first slot portion 111, which is away from the second slot portion 112, protrudes toward the central axis of the rotor core 10 to form the third slot portion 115. For example, the middle portion of the sidewall of the first slot portion 111, which is away from the second slot portion 112, protrudes toward the central axis of the rotor core 10. By providing the third slot portion 115, the side of the mounting slot 11 facing the center of the rotor core 10 can be spaced apart from the permanent magnet 20. The other portion of the sidewall of the first slot portion 111, which is away from the second slot portion 112, can be positioned in close contact with the permanent magnet 20 or spaced a short distance apart, thereby reducing the space occupied by the mounting slot 11 while increasing the proportion of the permanent magnet 20.

[0051] In some embodiments, as Figure 3-Figure 6 As shown, at least one sidewall of the mounting slot 11 away from the central axis of the rotor core 10 is spaced apart from the permanent magnet 20 by a spacing distance H3, where H3 satisfies the following: 0.05mm≤H3≤0.3mm. For example, H3=0.1mm, or H3=0.2mm. In other words, the sidewall of the mounting slot 11 away from the central axis of the rotor core 10 is spaced apart from the permanent magnet 20, and at least one sidewall of the mounting slot 11 in the width direction may also be spaced apart from the permanent magnet 20. Such a reasonable spacing distance can facilitate the installation of the permanent magnet 20 and the bonding connection between the permanent magnet 20 and the inner wall of the mounting slot 11. The thickness of the bonding layer can be ensured to improve the bonding reliability between the permanent magnet 20 and the mounting slot 11, while reducing magnetic flux leakage.

[0052] In some embodiments, as Figure 3-Figure 4 As shown, the second magnet portion 22 includes a third side wall 221, a fourth side wall 222 and a fifth side wall 223. The third side wall 221 and the fourth side wall 222 are arranged relative to each other in the width direction. The fifth side wall 223 is connected between the third side wall 221 and the fourth side wall 222. The cross section of the fifth side wall 223 is linear or arc-shaped. Both of the above-mentioned settings can increase the proportion of the permanent magnet 20 in the rotor core 10, increase the motor torque and reduce torque pulsation. When the cross section of the fifth side wall 223 is arc-shaped, the middle part of the fifth side wall 223 protrudes in the direction away from the first magnet portion 21 to form the above-mentioned arc. Of course, in other examples, the cross section of the fifth side wall 223 can also be other shapes such as wavy, which are not limited here.

[0053] Further, refer to Figure 4 The fifth side wall 223 is in an arc shape and the center of the circle in which the arc is located is eccentrically set relative to the center of the rotor core 10. Through Boolean operation, such a setting can improve the sinusoidality of the air gap magnetic density and improve the performance of the motor.

[0054] In some embodiments, as Figure 5 As shown, the cross sections of the third side wall 221 and the fourth side wall 222 are both arc-shaped. Figure 5 In the example of FIG, the third side wall 221 and the fourth side wall 222 are both arc segments of a quarter circle. In other embodiments, such as Figure 6 As shown, the cross-sections of the third side wall 221 and the fourth side wall 222 are straight lines, and the third side wall 221 and the fourth side wall 222 are away from each other in the direction from the second magnet portion 22 to the first magnet portion 21. Thus, while the second magnet portion 22 can reduce the distance between the stator and the permanent magnet 20, it can further reduce the cross-sectional area of ​​the mounting groove 11 at the outer peripheral wall of the rotor core 10, thereby improving the utilization rate of the permanent magnet 20 and further improving the structural strength of the rotor core 10. Both of the above-mentioned settings can increase the proportion of the permanent magnet 20 in the rotor core 10, increase the torque of the motor, and reduce torque pulsation. It can be understood that in Figure 5 and Figure 6 In the example, the width B2 of the second magnet portion 22 refers to the width of the second magnet portion 22 on the side away from the central axis of the rotor core 10 , rather than the maximum width of the second magnet portion 22 .

[0055] like Figure 3-Figure 6 As shown, the second slot 112 is connected to the middle portion of the first slot 111 in the width direction. As a result, the height of the middle portion of the permanent magnet 20 is higher than the height of the two sides in the width direction, which can further improve the sinusoidality of the air gap flux density, enhance the operating stability of the motor, and optimize the motor performance.

[0056] For example, the outer contour of the rotor core 10 can be cylindrical, and the mounting grooves 11 pass through the rotor core 10 in the axial direction of the rotor core 10 and are spaced apart from the outer peripheral wall of the rotor core 10. The mounting grooves 11 can be ten that are spaced apart in the circumferential direction of the rotor core 10, but are not limited thereto. The rotor core 10 can be formed by laminating the plates of the electric permanent magnet 20, and most of the structure of the rotor 100 is the main magnetic circuit. The rotor 100 can include an even number of permanent magnets 20, for example, 10. The permanent magnets 20 are fixed in the mounting grooves 11 by an adhesive, and then magnetized by magnetization. In some embodiments, the outer diameter R of the rotor core 10 is 51.4 mm, the height H1 of the first magnet portion 21 is 1.9 mm, the width B1 of the permanent magnet 20 is 12.8 mm, the height H2 of the permanent magnet 20 is 2.9 mm, and the width B2 of the second magnet portion 22 can be set according to actual conditions to ensure that the torque of the motor can be improved while the torque ripple is reduced. The spacing distance H3 between the permanent magnet 20 and the second slot portion 112 is 0.1 mm, and the axial length l of the rotor core 10 is 37.45 mm. When the rotor 100 satisfies the above parameters, the torque ripple can be reduced, the torque can be improved, the sinusoidal nature of the air gap flux density can be improved, the power density of the motor can be improved, and the motor has high stability and good performance.

[0057] The cogging torque is the main reason for the formation of the torque ripple, and the following formula is the calculation formula of the cogging torque of the motor:

[0058]

[0059]

[0060] Where F n represents the magnetic motive force generated by the permanent magnet 20, Br is the residual magnetic density, and a p is the pole arc coefficient.

[0061] Therefore, by providing the second magnet portion 22, the distribution of the permanent magnetic field can be adjusted, the magnetic flux density in the air gap can be improved, the waveform can be more ideal, and the torque and torque ripple of the motor can be optimized.

[0062] The parameters of the permanent magnet 20 in the embodiments of the application are simulated below in combination with Table 1.

[0063] Table 1

[0064]

[0065]

[0066] Referring to Figure 7, where the rest of the motor parameters remain unchanged, and the width B2 of the second magnet portion 22 is changed. At this time, the ratio B2 / B1 changes. The torque simulation calculation is performed for different B2 / B1 ratios. The curve results of the torque of the B2 / B1 ratio are as follows: Figure 7 As shown. The ratio of B1 to B2 is controlled to 0.3≤B2 / B1≤0.7, so as to take into account the proportion of the second magnet portion 22 in the rotor core 10 and the mechanical strength of the rotor core 10. At this time, the width B2 of the second magnet portion 22 satisfies: 3.84mm≤B2≤8.96mm. Figure 7 From the torque curve, we can see that as the value of B2 / B1 increases, the torque curve of the motor shows an increasing trend.

[0067] Reference Figure 8 , keeping the other parameters of the motor unchanged, changing the width B2 of the second magnet portion 22, changing the ratio of B2 / B1, and calculating the torque ripple for different B2 / B1 values. The calculation results are as follows Figure 8 As shown. Figure 8 From the torque pulsation curve, we can see that as the value of B2 / B1 increases, the torque pulsation curve of the motor increases first, then decreases, and then increases again. Figure 8 ,Depend on Figure 8 It can be seen from the torque pulsation curve that when 0.31≤B2 / B1≤0.44, the torque pulsation generally shows an increasing trend with the increase of B2 / B1 value; when 0.44<B2 / B1≤0.63, the torque pulsation generally shows a decreasing trend with the increase of B2 / B1 value; when 0.63<B2 / B1≤0.70, the torque pulsation generally shows an increasing trend with the increase of B2 / B1 value; and when B2 / B1 value = 0.63, the torque pulsation reaches the minimum value of 1.00%.

[0068] It can be concluded that when 0.56≤B2 / B1≤0.66, the parameter range is reasonable and the torque ripple is in the low value range. At this time, the value range of the width B2 of the second magnet portion 22 is 7.2mm≤B2≤8.5mm. Through data analysis, keeping the values ​​of the other motor parameters unchanged, by changing the size of the width B2 of the second magnet portion 22, the proportion of the second magnet portion 22 to the permanent magnet 20 can be changed. This shows that when the range of B2 / B1 is reasonable, the motor torque can be increased while reducing the torque ripple of the motor. This not only effectively utilizes the rotor core 10, but also solves the problem of the torque ripple of the built-in motor increasing with the increase in the amount of permanent magnet 20.

[0069] According to the motor of the embodiment of the present application, including the rotor 100 of the above-described embodiment of the present application, the proportion of the permanent magnets 20 in the rotor core 10 can be increased, thereby improving the torque of the motor. At the same time, the second magnet portion 22 can be positioned closer to the stator of the motor to facilitate interaction between the magnetic field of the stator and the magnetic field of the permanent magnets 20, thereby improving the torque of the motor. The utilization rate of the permanent magnets 20 is high, and the mechanical strength of the rotor core 10 can be guaranteed, ensuring the structural reliability of the rotor core 10.

[0070] Other structures and operations of the rotor 100 according to the novel embodiment of the present application, such as the rotating shaft 30 , are known to those skilled in the art and will not be described in detail here.

[0071] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0072] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0073] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A rotor, characterized in that: include: a rotor core having a plurality of mounting slots spaced apart in a circumferential direction, each of the mounting slots including a first slot portion and a second slot portion communicating with each other; a plurality of permanent magnets, each of the permanent magnets being disposed in a one-to-one correspondence within the plurality of mounting slots, each of the permanent magnets comprising a first magnet portion and a second magnet portion, the first magnet portion being fitted within the first slot portion, the second magnet portion being fitted within the second slot portion, the second magnet portion being connected to a side of the first magnet portion facing the outer contour of the rotor core, the first magnet portion being wider than the second magnet portion; The width of the permanent magnet is B1, and the width of the second magnet portion is B2. B1 and B2 satisfy the following conditions: 0.56≤B2 / B1≤0.66, 7.2mm≤B2≤8.5mm.

2. The rotor according to claim 1, characterized in that The height of the first magnet portion is H1, and the height of the permanent magnet is H2. H1 and H2 satisfy: 0.5≤H1 / H2≤0.

99.

3. The rotor according to claim 1, characterized in that The first groove portion includes a first side wall and a second side wall that are opposite to each other in a width direction, and the first side wall and the second side wall are away from each other in a direction from the first groove portion to the second groove portion.

4. The rotor according to claim 3, characterized in that The plurality of mounting grooves include adjacent first mounting grooves and second mounting grooves, the second sidewall of the first mounting groove is adjacent to the first sidewall of the second mounting groove, and the second sidewall of the first groove portion is parallel to the first sidewall of the second groove portion.

5. The rotor according to claim 1, characterized in that The mounting groove further includes a third groove portion communicating with the first groove portion, and a portion of a side wall of the first groove portion away from the second groove portion protrudes toward the central axis of the rotor core to form the third groove portion.

6. The rotor according to claim 1, characterized in that At least one side wall of the mounting groove away from the central axis of the rotor core is spaced apart from the permanent magnet by a distance H3, and H3 satisfies the following: 0.05 mm ≤ H3 ≤ 0.3 mm.

7. The rotor according to claim 1, characterized in that The second magnet portion includes: a third side wall and a fourth side wall, the third side wall and the fourth side wall being arranged opposite to each other along the width direction; A fifth side wall is connected between the third side wall and the fourth side wall, and a cross section of the fifth side wall is linear or arc-shaped.

8. The rotor according to claim 7, characterized in that The fifth side wall is in an arc shape, and the center of the circle where the arc is located is eccentrically arranged relative to the center of the rotor core.

9. The rotor according to claim 7, characterized in that The cross sections of the third side wall and the fourth side wall are both arc-shaped; or The third side wall and the fourth side wall have a straight line shape in cross section, and the third side wall and the fourth side wall are spaced apart from each other in a direction from the second magnet portion to the first magnet portion.

10. The rotor according to claim 1, wherein: The second groove portion is connected to a middle portion of the first groove portion in a width direction.

11. A motor, characterized in that: Comprising a rotor according to any one of claims 1-10.

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