Rotor structure and motor

Abstract

The rotor structure comprises a rotor core and a permanent magnet assembly, a magnetic steel groove and an air groove close to the magnetic steel groove are arranged in the rotor core, the permanent magnet assembly is arranged in the magnetic steel groove, the permanent magnet assembly comprises at least two tangential permanent magnets and at least one auxiliary permanent magnet, and the tangential permanent magnets are arranged in the air groove. And the auxiliary permanent magnet is arranged on a magnetic pole center line formed by the at least two tangential permanent magnets. According to the utility model, the auxiliary permanent magnet is arranged between the two tangential permanent magnets, the magnetic field provided by the auxiliary permanent magnet can effectively suppress the magnetic field leaked by the tangential permanent magnets, and the torque pulsation is effectively reduced, so that the vibration and noise of the motor are reduced; the air slots are formed near the tangential permanent magnets, and the positions and directions of magnetic fields generated by the tangential permanent magnets are changed by utilizing the non-magnetic conductivity of the air slots, so that the magnetic potential is changed, and the electromagnetic force is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor structure and a motor. Background Art

[0002] In traditional tangential permanent magnet synchronous motors, the leakage magnetic field at both ends of the tangential permanent magnets is serious. Due to the special configuration of the tangential permanent magnets, the magnetic flux at both ends tends to directly interlink with itself instead of reaching the stator through the air gap, which wastes the magnetic flux that should have acted on the stator to generate torque and cannot form effective magnetic flux. This leakage magnetic field phenomenon not only reduces the efficiency of the motor, but also leads to an increase in torque pulsation.

[0003] Torque pulsation is one of the undesirable phenomena in the operation of the motor. In the tangential permanent magnet synchronous motor, due to severe magnetic leakage and uneven magnetic field distribution, torque pulsation is generated. Torque pulsation will aggravate the vibration of the motor, affect the smooth operation performance of the motor, reduce the service life of the motor, and may have an adverse effect on the equipment around the motor.

[0004] In addition, the magnetic field generated by the tangential permanent magnet will undergo two processes of interlinking the motor air gap inside the motor. This phenomenon of multiple interlinkages significantly increases the magnetic density component and specific gravity in the air gap, which in turn leads to a significant increase in the electromagnetic force. The increase in electromagnetic force will not only increase the noise and vibration of the motor, but may also cause additional burden on the motor structure, affecting the safety and reliability of the motor. Utility Model Content

[0005] The utility model aims to provide a rotor structure and a motor, aiming to solve the problems of serious magnetic leakage, large torque pulsation, large electromagnetic force, etc. of the existing tangential permanent magnet synchronous motor.

[0006] An embodiment of the utility model provides a rotor structure, comprising: a rotor core and a permanent magnet assembly, wherein the rotor core is provided with a magnetic steel slot and an air slot close to the magnetic steel slot, the permanent magnet assembly is installed in the magnetic steel slot, the permanent magnet assembly comprises at least two tangential permanent magnets and at least one auxiliary permanent magnet, and the auxiliary permanent magnet is arranged on the center line of the magnetic pole constructed by at least two of the tangential permanent magnets.

[0007] Furthermore, the magnetic steel slot includes at least two tangential magnetic steel slots and at least one auxiliary magnetic steel slot, at least one auxiliary permanent magnet is installed in at least one auxiliary magnetic steel slot, and at least two tangential permanent magnets are respectively installed in at least two tangential magnetic steel slots.

[0008] Furthermore, the air groove is connected to at least one of the tangential magnetic steel grooves.

[0009] Furthermore, at least two of the tangential magnetic steel slots are respectively connected to at least one auxiliary magnetic steel slot.

[0010] Furthermore, a plurality of air slots are provided.

[0011] Furthermore, a plurality of the air slots are arranged along both sides of at least one of the tangential magnetic steel slots;

[0012] The air slots on both sides of the tangential magnetic steel slot are symmetrically arranged with respect to the magnetic pole line corresponding to the tangential permanent magnet; or, the air slots on both sides of the tangential magnetic steel slot are asymmetrically arranged with respect to the magnetic pole line corresponding to the tangential permanent magnet, and the difference in the number of the air slots on both sides of the tangential magnetic steel slot is less than or equal to 1.

[0013] Furthermore, the heights of the plurality of air slots perpendicular to the sideline direction of the tangential permanent magnets decrease gradually inwardly along the radial direction of the rotor core.

[0014] Furthermore, the magnetic steel slots and the permanent magnet assemblies are provided in plurality, and the magnetic steel slots, the permanent magnet assemblies and the directions of the magnetic fields provided by the permanent magnet assemblies are all arranged symmetrically along the center of the rotor core.

[0015] Furthermore, the tangential permanent magnets are arranged along the radial direction of the rotor core, and the auxiliary permanent magnets are arranged along the tangential direction of the rotor core, wherein the magnetic fields provided by at least two of the tangential permanent magnets and at least one of the auxiliary permanent magnets are in the same direction.

[0016] Furthermore, the distance formed by the air slot along the sideline direction of the tangential permanent magnet is K, the magnetization length of the tangential permanent magnet is H, and the following condition is satisfied: K≤H.

[0017] Furthermore, the maximum distance between the air slot and the edge line of the tangential permanent magnet is G, the width of the tangential permanent magnet is S, the number of magnetic poles of the rotor is P, and it satisfies: G≤S*arcsin(180deg / P), where arcsin represents an inverse sine function.

[0018] Furthermore, G ≥ 2*K.

[0019] Furthermore, for at least one of the tangential permanent magnets, the total length of the area outside the projection range of all the air slots on the edge line of the corresponding tangential permanent magnet is L, and satisfies: L≤S / 2, where S is the width of the corresponding tangential permanent magnet.

[0020] Furthermore, an extension line of the side line of the air slot is arranged away from the outer side of the tangential permanent magnet.

[0021] Furthermore, the included angle between the edge line of the air slot and the tangential permanent magnet is less than 90 degrees.

[0022] An embodiment of the utility model further provides a motor, comprising: the above-mentioned rotor structure.

[0023] The utility model discloses a rotor structure and a motor, wherein the rotor structure comprises: a rotor core and a permanent magnet assembly, wherein a magnetic steel slot and an air slot near the magnetic steel slot are arranged in the rotor core, wherein the permanent magnet assembly is installed in the magnetic steel slot, and wherein the permanent magnet assembly comprises at least two tangential permanent magnets and at least one auxiliary permanent magnet, wherein the auxiliary permanent magnet is arranged on the center line of the magnetic pole constructed by at least two tangential permanent magnets. The utility model arranges an auxiliary permanent magnet between two tangential permanent magnets, wherein the magnetic field provided by the auxiliary permanent magnet can effectively suppress the magnetic field leaked by the tangential permanent magnet, effectively reduces the torque pulsation, thereby reducing the vibration and noise of the motor; and by opening an air slot near the tangential permanent magnet, utilizing the non-magnetic conductivity of the air slot, the position and direction of the magnetic field generated by the tangential permanent magnet is changed, thereby changing the magnetic potential, thereby reducing the electromagnetic force. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a schematic diagram of the rotor structure;

[0026] Figure 2 It is a schematic diagram of the rotor structure (without the permanent magnet assembly);

[0027] Figure 3 for Figure 2 Partial diagram of A in the middle;

[0028] Figure 4 It is a partial diagram of a rotor structure in which the air slot is semicircular;

[0029] Figure 5 It is a partial diagram of the rotor structure with semicircular air slots (without the permanent magnet assembly);

[0030] Figure 6 for Figure 5 Partial diagram of B in the figure;

[0031] Figure 7 It is a schematic diagram of the rotor structure (without the magnetic steel slot);

[0032] Figure 8 It is a partial diagram of a rotor structure in which the air slot is a long strip;

[0033] Fig. 9It is a partial diagram of the rotor structure with long strip-shaped air slots (without the permanent magnet assembly);

[0034] Fig.10 A partial diagram of a rotor structure with a triangular air slot;

[0035] Fig.11 for Fig.10 Partial diagram of D in the middle;

[0036] Description of the markings in the figure:

[0037] 1. Rotor core; 2. Permanent magnet assembly; 3. Magnetic steel slot; 4. Air slot; 5. Tangential permanent magnet; 6. Auxiliary permanent magnet; 7. Tangential magnetic steel slot; 8. Auxiliary magnetic steel slot. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0040] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0041] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0042] See also Figure 1-7 The present embodiment provides a rotor structure, including: a rotor core 1 and a permanent magnet assembly 2, wherein the rotor core 1 is provided with a magnetic steel slot 3 and an air slot 4 close to the magnetic steel slot 3, the permanent magnet assembly 2 is installed in the magnetic steel slot 3, the permanent magnet assembly 2 includes at least two tangential permanent magnets 5 and at least one auxiliary permanent magnet 6, and the auxiliary permanent magnet 6 is arranged on the magnetic pole center line M constructed by the at least two tangential permanent magnets 5.

[0043] In this embodiment, an auxiliary permanent magnet 6 is arranged between two tangential permanent magnets 5. The magnetic field provided by the auxiliary permanent magnet 6 can effectively suppress the magnetic field leaked by the tangential permanent magnet 5, effectively reducing the torque pulsation, thereby reducing the vibration and noise of the motor; by opening an air slot 4 near the tangential permanent magnet 5, the non-magnetic conductivity of the air slot 4 is utilized to change the position and direction of the magnetic field generated by the tangential permanent magnet 5, thereby changing the magnetic potential and reducing the electromagnetic force; and the design of the air slot 4 can increase the heat dissipation area, promote air circulation, and effectively reduce the temperature of the equipment, thereby increasing the service life of the motor.

[0044] Specifically, the magnetic steel slot 3 includes at least two tangential magnetic steel slots 7 and at least one auxiliary magnetic steel slot 8, at least one auxiliary permanent magnet 6 is installed in at least one auxiliary magnetic steel slot 8, and at least two tangential permanent magnets 5 are respectively installed in at least two tangential magnetic steel slots 7.

[0045] The design of the tangential magnetic steel slots 7 allows the tangential permanent magnets 5 to be arranged at a specific angle and direction, which helps to maximize the efficiency of the magnetic flux path and the utilization of the magnetic energy product. Through a reasonable layout, a higher magnetic flux density and a more uniform magnetic field distribution can be obtained.

[0046] In some embodiments, two tangential magnetic steel slots 7 and at least one auxiliary magnetic steel slot 8 are combined into a common magnetic steel slot, and a plurality of common magnetic steel slots are arranged along the radial direction of the rotor core 1, and corresponding tangential permanent magnets 5 and auxiliary permanent magnets 6 are installed in the plurality of common magnetic steel slots. Such a design can generate a higher magnetic flux density and a more uniform magnetic field, thereby improving the torque density and efficiency of the motor.

[0047] In some embodiments, the auxiliary permanent magnet 6 is disposed at the same end of the two tangential permanent magnets 5 and is located between the two tangential permanent magnets 5 .

[0048] The auxiliary permanent magnets 6 are arranged at the ends of the two tangential permanent magnets 5 to effectively suppress the magnetic field leakage from the ends of the tangential permanent magnets 5 close to the center of the rotor, effectively reducing the torque pulsation, thereby reducing the vibration and noise of the motor.

[0049] In some embodiments, the air slot 4 is connected to at least one tangential magnetic steel slot 7 .

[0050] The connection between the air slot 4 and the tangential magnetic steel slot 7 can simplify the structure of the motor, reduce the number and complexity of parts, and reduce manufacturing costs.

[0051] In some embodiments, at least two tangential magnetic steel slots 7 are respectively connected to at least one auxiliary magnetic steel slot 8 .

[0052] When the tangential magnetic steel slot 7 is connected with the auxiliary magnetic steel slot 8, the magnetic field is transmitted between the two more smoothly, reducing the loss and distortion of the magnetic field during the transmission process; at the same time, the connection between the tangential magnetic steel slot 7 and the auxiliary magnetic steel slot 8 can form a larger magnetic flux path, thereby increasing the magnetic flux.

[0053] In this embodiment, a plurality of air slots 4 are provided. The provision of a plurality of air slots 4 can significantly improve the distribution of magnetic lines of force, thereby increasing the magnetic field concentration effect and reducing magnetic leakage.

[0054] Further, a plurality of air slots 4 are provided along both sides of at least one tangential magnetic steel slot 7;

[0055] The air slots 4 on both sides of the tangential magnetic steel slot 7 are symmetrically arranged with respect to the magnetic pole line N of the corresponding tangential permanent magnet 5; or, the air slots 4 on both sides of the tangential magnetic steel slot 7 are asymmetrically arranged with respect to the magnetic pole line N of the corresponding tangential permanent magnet 5, and the difference in the number of the air slots 4 on both sides of the tangential magnetic steel slot 7 is less than or equal to 1.

[0056] The structural design in which the air slots 4 are symmetrically or asymmetrically arranged but the difference in the number of the air slots 4 is less than or equal to 1 makes the effect on each magnetic pole consistent, the magnetic circuit symmetrical, and the effect of magnetic concentration and reducing leakage magnetic flux is better.

[0057] Furthermore, the heights of the plurality of air slots 4 perpendicular to the side lines of the tangential permanent magnets 5 decrease inwardly along the radial direction of the rotor core 1 .

[0058] The height of the air slot 4 in this embodiment is the maximum distance formed by the edge line perpendicular to the tangential permanent magnet 5, and the heights of the plurality of air slots 4 decrease inwardly along the radial direction of the rotor core 1, that is, the closer the air slot 4 is to the center of the rotor core 1, the lower its height is. Figure 2 As shown, the distance between the air slot a and the center of the rotor core 1 is greater than the distance between the air slot b and the center of the rotor core 1 and the distance between the air slot c and the center of the rotor core 1, and the height of the air slot a is less than the height of the air slot b and the height of the air slot c. By limiting the height of the air slot 4, the air slot 4 will not affect the direction of the magnetic field generated by the auxiliary permanent magnet 6, thereby avoiding affecting the magnetic leakage suppression effect of the auxiliary permanent magnet 6.

[0059] In this embodiment, multiple magnetic steel slots 3 and permanent magnet assemblies 2 are provided, and the magnetic steel slots 3, permanent magnet assemblies 2 and the directions of the magnetic fields provided by the permanent magnet assemblies 2 are all arranged symmetrically along the center of the rotor core 1.

[0060] Since the magnetic steel slots 3 and the permanent magnet assembly 2 are arranged symmetrically along the center of the circle, the generated magnetic field is also evenly distributed. This uniform magnetic field distribution can ensure that the motor is evenly stressed during operation, reduce vibration and noise, and improve the stability and reliability of the motor. The symmetrical magnetic field layout can maximize the use of the magnetic field generated by the permanent magnet, reduce leakage flux and magnetic resistance, and thus improve the energy conversion efficiency of the motor.

[0061] In this embodiment, the tangential permanent magnets 5 are arranged along the radial direction of the rotor core 1, and the auxiliary permanent magnets 6 are arranged along the tangential direction of the rotor core 1, wherein the magnetic fields provided by at least two tangential permanent magnets 5 and at least one auxiliary permanent magnet 6 have the same direction.

[0062] The magnetic field directions of the tangential permanent magnets 5 and the auxiliary permanent magnets 6 are both from the inside of the rotor to the outside, or vice versa. The structural design in which the magnetic fields provided by at least two tangential permanent magnets 5 and at least one auxiliary permanent magnet 6 have the same direction enables the magnetic field to form a coherent magnetic flux path inside the rotor. This consistent magnetic field direction helps to improve the torque and efficiency of the motor because the magnetic field can interact with the stator winding more effectively.

[0063] In this embodiment, please refer to Figure 3-9 The shape of the air slot 4 is not limited. The shape of the air slot 4 can be regular shapes such as semicircle, strip and triangle, or irregular shapes such as special shapes. The air slot 4 only needs to consider two basic parameters: height and span.

[0064] For details, please refer to Fig.10 and Fig.11 , the distance formed by the air slot 4 along the edge direction of the tangential permanent magnet 5 is K (i.e., the span), the magnetization length of the tangential permanent magnet 5 is H, and satisfies: K≤H. Among them, the tangential permanent magnet 5 is magnetized along the thickness direction, so its magnetization length is the thickness of the tangential permanent magnet 5.

[0065] The limiting span has a greater influence on the magnetic field of the tangential permanent magnet 5 , which can satisfy the reduction amount of the electromagnetic force and set its influence on the magnetic field within a reasonable range.

[0066] Furthermore, the maximum distance between the air slot 4 and the edge of the tangential permanent magnet 5 is G (ie, height), the width of the tangential permanent magnet 5 is S, the number of magnetic poles of the rotor is P, and it satisfies: G≤S*arcsin(180deg / P), where arcsin represents an inverse sine function.

[0067] To prevent the air slots 4 from affecting the direction of the magnetic field generated by the auxiliary permanent magnets 6, the heights G of all the air slots 4 must be located inside a right triangle with the width of the tangential permanent magnets 5 as the hypotenuse, that is, the heights G of all the air slots 4 must satisfy G≤S*arcsin(180deg / P).

[0068] Furthermore, G≥2*K. With such a design, the air slot 4 can be arranged into an elongated slot along the main magnetic field direction. The structural design of the elongated slot can reduce the electromagnetic force and hardly affect the overall magnetic field.

[0069] Furthermore, for at least one tangential permanent magnet 5 , the total length of the area outside the projection range of all the air slots 4 on the edge line of the corresponding tangential permanent magnet 5 is L, and satisfies: L≤S / 2, where S is the width of the corresponding tangential permanent magnet.

[0070] The farther the air slot 4 is from the outside of the rotor, the smaller its influence on the electromagnetic force is, and the closer the air slot 4 is to the outside of the rotor, the greater its influence on the electromagnetic force is. At the same time, the air slot 4 is arranged on the outside of the rotor to alleviate the leakage magnetic field problem on the outside of the tangential permanent magnet 5. Therefore, the air slot 4 should be arranged near the outside of the rotor. To ensure that a sufficient number of air slots 4 are arranged near the outside of the rotor, this embodiment sets the projection range of all air slots 4 on the width of the tangential permanent magnet 5 to account for more than half of the width of the tangential permanent magnet 5, that is, the total length of the area outside the projection range of all air slots 4 on the edge line of the corresponding tangential permanent magnet 5 must be less than or equal to half of the width of the tangential permanent magnet 5. Wherein, L = the width S of the permanent magnet - the sum of the spans K of all air slots 4, and all air slots 4 represent all air slots 4 on one side of the tangential magnetic steel slot 7 corresponding to the tangential permanent magnet 5.

[0071] In this embodiment, the extension line of the side line of the air slot 4 is arranged away from the outer side of the tangential permanent magnet 5 .

[0072] When the height of the air slot 4 and the intersection of the tangential permanent magnet 5 exceed the span range, the air slot 4 is required to guide the main magnetic field to flow from inside to outside, that is, it is necessary to ensure that the extension line of the edge of the air slot 4 is set away from the outside of the tangential permanent magnet 5.

[0073] Furthermore, the angle between the edge line of the air slot 4 and the tangential permanent magnet 5 is less than 90 degrees, so that the air slot 4 can have a better guiding effect.

[0074] In this embodiment, the material of the tangential permanent magnet 5 and the auxiliary permanent magnet 6 is usually made of rare earth permanent magnet materials, which have unique magnetic properties, such as high magnetic energy product, high coercive force, high magnetic permeability, etc. Among them, neodymium iron boron permanent magnet is the most commonly used rare earth permanent magnet material, which has high magnetic energy product and high coercive force, and can meet the needs of different application scenarios.

[0075] In addition to NdFeB permanent magnets, there are other types of rare earth permanent magnet materials to choose from, such as SmCo permanent magnets and NdFeB permanent magnets. These materials all have high magnetic properties and stability, and can be selected according to different needs. For example, SmCo permanent magnets have high coercivity and high corrosion resistance, so they are suitable for use in high temperature and corrosive environments; while NdFeB permanent magnets have higher magnetic energy product and lower price, so they are suitable for use in occasions with lower requirements.

[0076] This embodiment also provides a motor, including: the rotor structure of the above embodiment.

[0077] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0078] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0079] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A rotor structure, characterized in that: include: A rotor core and a permanent magnet assembly, wherein the rotor core is provided with a magnetic steel slot and an air slot close to the magnetic steel slot, the permanent magnet assembly is installed in the magnetic steel slot, the permanent magnet assembly includes at least two tangential permanent magnets and at least one auxiliary permanent magnet, and the auxiliary permanent magnet is arranged on the center line of the magnetic pole constructed by at least two of the tangential permanent magnets.

2. The rotor structure according to claim 1, characterized in that: The magnetic steel slots include at least two tangential magnetic steel slots and at least one auxiliary magnetic steel slot, at least one auxiliary permanent magnet is installed in at least one auxiliary magnetic steel slot, and at least two tangential permanent magnets are respectively installed in at least two tangential magnetic steel slots.

3. The rotor structure according to claim 2, characterized in that: The air groove is in communication with at least one of the tangential magnetic steel grooves.

4. The rotor structure according to claim 2, characterized in that: At least two of the tangential magnetic steel slots are respectively connected to at least one auxiliary magnetic steel slot.

5. The rotor structure according to claim 2, characterized in that: A plurality of air slots are provided.

6. The rotor structure according to claim 5, characterized in that: A plurality of the air slots are arranged along both sides of at least one of the tangential magnetic steel slots; The air slots on both sides of the tangential magnetic steel slot are symmetrically arranged with respect to the magnetic pole line corresponding to the tangential permanent magnet; or, the air slots on both sides of the tangential magnetic steel slot are asymmetrically arranged with respect to the magnetic pole line corresponding to the tangential permanent magnet, and the difference in the number of the air slots on both sides of the tangential magnetic steel slot is less than or equal to 1.

7. The rotor structure according to claim 5, characterized in that: The heights of the plurality of air slots perpendicular to the sideline direction of the tangential permanent magnets decrease gradually inwardly along the radial direction of the rotor core.

8. The rotor structure according to claim 1, characterized in that: The magnetic steel slots and the permanent magnet assemblies are both provided in plurality, and the magnetic steel slots, the permanent magnet assemblies and the directions of the magnetic fields provided by the permanent magnet assemblies are all arranged symmetrically along the center of the rotor core.

9. The rotor structure according to claim 1, characterized in that: The tangential permanent magnets are arranged along the radial direction of the rotor core, and the auxiliary permanent magnets are arranged along the tangential direction of the rotor core, wherein the magnetic fields provided by at least two of the tangential permanent magnets and at least one of the auxiliary permanent magnets are in the same direction.

10. The rotor structure according to claim 1, characterized in that: The distance formed by the air slot along the sideline direction of the tangential permanent magnet is K, the magnetization length of the tangential permanent magnet is H, and the following is satisfied: K≤H.

11. The rotor structure according to claim 10, characterized in that: The maximum distance formed by the air slot perpendicular to the edge line of the tangential permanent magnet is G, the width of the tangential permanent magnet is S, the number of magnetic poles of the rotor is P, and it satisfies: G≤S*arcsin(180deg / P), where arcsin represents an inverse sine function.

12. The rotor structure according to claim 11, characterized in that: G≥2*K.

13. The rotor structure according to claim 1, characterized in that: For at least one of the tangential permanent magnets, the total length of the area outside the projection range of all the air slots on the edge line of the corresponding tangential permanent magnet is L, and satisfies: L≤S / 2, where S is the width of the corresponding tangential permanent magnet.

14. The rotor structure according to claim 1, characterized in that: The extension line of the side line of the air slot is arranged away from the outer side of the tangential permanent magnet.

15. The rotor structure according to claim 1, characterized in that: The included angle between the edge line of the air slot and the tangential permanent magnet is less than 90 degrees.

16. A motor, characterized in that: include: A rotor structure as claimed in any one of claims 1 to 15.

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