Rotor and motor

Abstract

The invention provides a rotor and a motor, and belongs to the technical field of mechanical equipment. The rotor comprises a rotor yoke, a plurality of first permanent magnets and a plurality of second permanent magnets; the rotor yoke is of a disc structure, the rotor yoke is provided with a plurality of installation hole sets distributed in the circumferential direction of the rotor yoke, each installation hole set comprises two first installation holes symmetrically formed in the radial direction of the rotor yoke, each first installation hole comprises a first hole part and a second hole part, and the second hole parts are located on the sides, away from the circle center of the rotor yoke, of the first hole parts. The two first inner walls, located between the two first hole parts, in the mounting hole group are arranged in parallel, and the distance between the two first inner walls is smaller than a preset distance; the first permanent magnets are respectively positioned in different first hole parts, are attached to the first inner walls of the first hole parts, and are connected with the rotor yoke; and each second permanent magnet is respectively positioned in a different second hole part and is connected with the rotor yoke. According to the invention, the strength of the rotor is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mechanical equipment, and particularly relates to a rotor and a motor. Background Art

[0002] Due to the relatively high remanence of the rare earth permanent magnets used in the rotor of a rare earth permanent magnet motor, this motor has the advantages of small size, light weight, high efficiency, and good characteristics. However, due to the relatively high cost of rare earth permanent magnets, usually, some of the rare earth permanent magnets in the motor are replaced with low-cost permanent magnets, and the amount of low-cost permanent magnets is increased to achieve the same performance. Such a motor is called a hybrid permanent magnet motor.

[0003] Generally, the rotor in a hybrid permanent magnet motor includes a rotor yoke, rare earth permanent magnets, and low-cost permanent magnets. The rotor yoke has a plurality of mounting holes arranged circumferentially. The mounting holes are V-shaped holes, and the V-shaped holes include two through holes extending along the radial direction of the rotor yoke, and the two through holes communicate with each other at a position close to the center of the rotor yoke. One rare earth permanent magnet and one low-cost permanent magnet are arranged in each through hole.

[0004] However, the strength of the above rotor is relatively low. When the rotor of the hybrid permanent magnet motor rotates, the rare earth permanent magnets and the low-cost permanent magnets will generate a relatively large force on the rotor yoke, which may cause the rotor yoke to deform. Summary of the Invention

[0005] Embodiments of the present disclosure provide a rotor and a motor, which can solve the technical problems existing in the related art. The technical solutions of the rotor and the motor are as follows:

[0006] On the one hand, embodiments of the present disclosure provide a rotor, which includes a rotor yoke, a plurality of first permanent magnets, and a plurality of second permanent magnets;

[0007] The rotor yoke has a disc structure. The rotor yoke has a plurality of mounting hole groups arranged circumferentially along the rotor yoke. Each mounting hole group includes two first mounting holes symmetrically arranged along the radial direction of the rotor yoke. The first mounting hole includes a first hole portion and a second hole portion. The second hole portion is located on a side of the first hole portion away from the center of the rotor yoke. Two first inner walls between the two first hole portions in the mounting hole group are parallel to each other, and the distance between the two first inner walls is less than a preset distance;

[0008] Each first permanent magnet is respectively located in a different first hole portion and is in contact with the first inner wall of the first hole portion. The first permanent magnet is connected to the rotor yoke;

[0009] Each second permanent magnet is respectively located in a different second hole portion and is connected to the rotor yoke.

[0010] In a possible implementation, on a plane perpendicular to the axis of the rotor yoke, the cross-sectional shapes of the first permanent magnet and the second permanent magnet are polygons.

[0011] In a possible implementation, on a plane perpendicular to the axis of the rotor yoke, none of the sides of the cross-section of the first permanent magnet are parallel to any side of the second permanent magnet.

[0012] In a possible implementation, on a plane perpendicular to the axis of the rotor yoke, the cross-sectional shape of the first permanent magnet is a pentagon, the pentagon has four first side edges and one second side edge, and every two adjacent first side edges among the four first side edges are perpendicular to each other;

[0013] The side surface corresponding to the second side edge is in contact with the first inner wall of the first hole portion.

[0014] In a possible implementation, the first hole portion has a first accommodation portion and a first vacant portion, and the first permanent magnet is located in the first accommodation portion.

[0015] In a possible implementation, on a plane perpendicular to the axis of the rotor yoke, the cross-sectional shape of the second permanent magnet is a rectangle.

[0016] In a possible implementation, the second hole portion has a second accommodation portion and a second vacant portion, and the second permanent magnet is located in the second accommodation portion.

[0017] In a possible implementation, the rotor further includes a plurality of third permanent magnets;

[0018] The rotor yoke further has a plurality of second mounting holes arranged circumferentially along the rotor yoke, and the position of each second mounting hole corresponds to the position of a different mounting hole group;

[0019] Each third permanent magnet is respectively located in a different second mounting hole and is connected to the rotor yoke.

[0020] In a possible implementation, the second mounting hole is located between two second hole portions in a mounting hole group with corresponding positions, or the second mounting hole is located on the side closer to the center of the circle of the rotor yoke between two first hole portions in the mounting hole group with corresponding positions.

[0021] In a possible implementation, the second mounting hole has a third accommodation portion and a third vacant portion, and the third permanent magnet is located in the third accommodation portion.

[0022] In a possible implementation, the third permanent magnet has a cuboid structure, and the length direction of the cuboid structure is perpendicular to the radial direction of the rotor yoke.

[0023] In a possible implementation, the material of the first permanent magnet is ferrite, and the material of the second permanent magnet is rare earth permanent magnet.

[0024] On the other hand, an embodiment of the present disclosure provides a motor, and the motor includes the rotor described in any one of the above.

[0025] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0026] An embodiment of the present disclosure provides a rotor. The two first inner walls between the two first hole portions in the mounting hole group are arranged in parallel, and the distance between the two first inner walls is less than a preset distance. In this way, there is a relatively thin rotor yoke portion between the two first mounting holes, which improves the strength of the rotor without affecting the rotor performance.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 is a schematic structural diagram of a rotor yoke shown in an embodiment of the present disclosure;

[0030] Figure 2 is a schematic structural diagram of a rotor shown in an embodiment of the present disclosure;

[0031] Figure 3 is a schematic partial structural diagram of a rotor yoke shown in an embodiment of the present disclosure.

[0032] LEGEND DESCRIPTION

[0033] 1. Rotor yoke; 2. First permanent magnet; 3. Second permanent magnet; 4. Third permanent magnet;

[0034] 11. Mounting hole group; 111. First mounting hole; 111a. First hole portion; 111b. Second hole portion; 111a1. First accommodating portion; 111a2. First vacant portion; 111b1. Second accommodating portion; 111b2. Second vacant portion;

[0035] 12. Second mounting hole; 12a. Third accommodating portion; 12b. Third vacant portion;

[0036] m, the first inner wall. Detailed implementation mode

[0037] To make the purpose, technical solution and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0038] The embodiment of the present disclosure provides a rotor, as Figure 1 shown, the rotor includes a rotor yoke 1, a plurality of first permanent magnets 2 and a plurality of second permanent magnets 3.

[0039] Among them, the rotor yoke 1 is used to support and connect a plurality of first permanent magnets 2 and a plurality of second permanent magnets 3, and has a magnetic conduction function.

[0040] The first permanent magnets 2 and the second permanent magnets 3 are used in combination to provide power for the operation of the motor.

[0041] Next, the rotor yoke 1, the first permanent magnet 2 and the second permanent magnet 3 will be introduced:

[0042] Rotor yoke 1

[0043] The rotor yoke 1 has a disc structure. The rotor yoke 1 can be formed by laminating a plurality of silicon steel sheets.

[0044] The rotor yoke 1 has a plurality of mounting hole groups 11 arranged circumferentially along the rotor yoke 1, and these plurality of mounting hole groups 11 can be evenly arranged.

[0045] Each mounting hole group 11 may include two first mounting holes 111 symmetrically arranged along the radial direction of the rotor yoke 1. The distance between the positions of these two first mounting holes 111 close to the center of the rotor yoke 1 is relatively close, and the distance between the positions far from the center of the rotor yoke 1 is relatively far. In this way, the two first mounting holes 111 form a V shape, that is, the included angle formed between the two first mounting holes 111 faces the outside of the rotor yoke 1, obtaining a V-shaped embedded rotor.

[0046] The first mounting hole 111 may include a first hole portion 111a and a second hole portion 111b. The second hole portion 111b is located on the side of the first hole portion 111a away from the center of the rotor yoke 1, and the first hole portion 111a is communicated with the second hole portion 111b.

[0047] The two first inner walls m located between the two first hole portions 111a in the mounting hole group 11 are parallel to each other, and the distance between the two first inner walls m is less than a preset distance, that is: in a mounting hole group 11, the two closest inner walls (i.e., the first inner walls m) of the two first hole portions 111a are parallel to each other, and the distance between them is less than a preset distance. In this way, a thinner part of the rotor yoke 1 can be provided between the two first mounting holes 111.

[0048] The first permanent magnet 2

[0049] As Figure 2 shown, each first permanent magnet 2 is respectively located in a different first hole portion 111a, and is in contact with the first inner wall m of the first hole portion 111a. The first permanent magnet 2 is connected to the rotor yoke 1. In this way, for the two first permanent magnets 2 provided in one mounting hole group 11, the sides of the two first permanent magnets 2 that are in contact with the first inner wall m are arranged in parallel, and the distance between the two sides is less than a preset distance, that is, the distance between them is relatively small. In this way, when the rotor is applied to a motor, due to the relatively short distance between the two first permanent magnets 2, the performance of the rotor will not change significantly, but the strength of the rotor will increase significantly.

[0050] In the embodiments of the present disclosure, the preset distance can be any reasonable distance. For example, the preset distance can be 7 mm, 10 mm, etc., and the embodiments of the present disclosure do not limit this.

[0051] In the embodiments of the present disclosure, the connection between the first permanent magnet 2 and the rotor yoke 1 can be achieved through adhesive bonding or interference fit, etc., and the embodiments of the present disclosure do not limit this.

[0052] The second permanent magnet 3

[0053] Each second permanent magnet 3 is respectively located in a different second hole portion 111b and is connected to the rotor yoke 1. Among them, the connection between the second permanent magnet 3 and the rotor yoke 1 can be achieved through adhesive bonding or interference fit, etc., and the embodiments of the present disclosure do not limit this.

[0054] In a possible implementation manner, the first permanent magnet 2 can be a ferrite, and the second permanent magnet 3 can be a rare earth permanent magnet. In this way, the performance of the rotor can be improved by using a rare earth permanent magnet with better performance, and by combining the relatively low-cost ferrite with the relatively high-cost rare earth permanent magnet, the cost can be reduced while improving the rotor performance.

[0055] Of course, the first permanent magnet 2 and the second permanent magnet 3 can also be other combinations of permanent magnet types. For example, other combinations that meet the requirement that the remanence of the first permanent magnet 2 is higher than that of the second permanent magnet 3 are not limited in the embodiments of the present disclosure.

[0056] In the embodiments of the present disclosure, the shapes of the first permanent magnet 2 and the second permanent magnet 3 can be any reasonable shapes. The following are several possible structures:

[0057] The shapes of the first permanent magnet 2 and the first hole portion 111a

[0058] In a possible implementation, on a plane perpendicular to the axis of the rotor yoke 1, the cross-sectional shapes of the first permanent magnet 2 and the second permanent magnet 3 are polygons, that is, the shapes of the first permanent magnet 2 and the second permanent magnet 3 can be straight prisms with a polygonal base. In this way, it is convenient to cut and form the first permanent magnet 2 and the second permanent magnet 3.

[0059] In a possible implementation, on a plane perpendicular to the axis of the rotor yoke 1, none of the sides of the cross-section of the first permanent magnet 2 is parallel to any side of the second permanent magnet 3. In this way, when the rotor is working and rotating along its own axis, the forces generated by the first permanent magnet 2 and the second permanent magnet 3 on the rotor yoke 1 are not in the same direction, reducing the local stress of the rotor yoke 1 and improving the strength of the rotor.

[0060] In a possible implementation, the shape of the first permanent magnet 2 can be: on a plane perpendicular to the axis of the rotor yoke 1, the cross-sectional shape of the first permanent magnet 2 is a pentagon, which has four first side edges and one second side edge. Each two adjacent first side surfaces among the four first side edges are perpendicular to each other, that is: the pentagon of the cross-sectional shape of the first permanent magnet 2 can be regarded as a rectangle with a corner cut off, and the side edge corresponding to the cut-off corner is the second side edge. In this way, compared with the permanent magnet with a rectangular cross-section used in the prior art, the first permanent magnet 2 with a pentagonal cross-sectional shape here can avoid the force on the rotor yoke 1 being too concentrated on the side of the first permanent magnet 2 far from the center of the rotor yoke 1, thereby improving the strength of the rotor. At the same time, such a pentagonal shape is more convenient for cutting and forming the first permanent magnet 2, improving the operation convenience and operation efficiency.

[0061] In the embodiments of the present disclosure, on a plane perpendicular to the axis of the rotor yoke 1, the cross-sectional shape of the first permanent magnet 2 can also be a hexagon, a heptagon, etc., and the embodiments of the present disclosure do not limit this.

[0062] For the first permanent magnet 2 with the above shape, when it is installed with the rotor yoke 1, the second side edge of the first permanent magnet 2 is in contact with the side edge corresponding to the first inner wall m of the first hole portion 111a, that is: the side surface corresponding to the second side edge of the first permanent magnet 2 is in contact with the first inner wall m of the first hole portion 111a.

[0063] In this way, the distance between two first permanent magnets 2 installed in the same mounting hole group 11 can be made closer, and there is a relatively thin part of the rotor yoke 1 between them, improving the strength of the rotor without affecting the rotor performance.

[0064] In a possible implementation, the shape of the first hole portion 111a of the first mounting hole 111 may correspond to the shape of the first permanent magnet 2. For example, the first hole portion 111a and the first permanent magnet 2 may be in clearance fit. After inserting the first permanent magnet 2 into the first hole portion 111a, glue is used to fill the gap between the first permanent magnet 2 and the first hole portion 111a, and the two are adhered together. For another example, the first hole portion 111a and the first permanent magnet 2 may be in interference fit, and the first permanent magnet 2 is directly inserted into the first hole portion 111a to achieve the connection between the two, and so on.

[0065] In another possible implementation, as Figure 3 shown, the first hole portion 111a may further have a first accommodating portion 111a1 and a first vacant portion 111a2, and the first accommodating portion 111a1 and the first vacant portion 111a2 are in communication with each other.

[0066] The first permanent magnet 2 is located in the first accommodating portion 111a1. That is, in a plane perpendicular to the axis of the rotor yoke 1, the shape of the first accommodating portion 111a1 corresponds to the shape of the first permanent magnet 2.

[0067] When installing the first permanent magnet 2, the first permanent magnet 2 can be arranged in the first accommodating portion 111a1 in the first hole portion 111a to fit with the first accommodating portion 111a1. At this time, the first permanent magnet 2 is connected to the position of the rotor yoke 1 corresponding to the first accommodating portion 111a1, while the first vacant portion 111a2 separates the first permanent magnet 2 from the rotor yoke 1, so that part of their positions do not contact. In this way, the force generated by the first permanent magnet 2 on the rotor yoke 1 when the rotor rotates can be dispersed, avoiding the concentration of the force to cause serious deformation of the rotor yoke 1, thereby improving the strength of the rotor.

[0068] Furthermore, the first vacant portion 111a2 can be arranged at the position where the stress of the rotor yoke 1 is relatively large when the rotor rotates, so as to disperse the relatively large force generated by the first permanent magnet 2 on the local position of the rotor yoke 1, thereby improving the strength of the rotor.

[0069] As Figure 3 shown, the first hole portion 111a may have a plurality of first vacant portions 111a2, and these plurality of first vacant portions 111a2 are located on one side of the first hole portion 111a close to the center of the circle of the rotor yoke 1, on one side of the first hole portion 111a far from the center of the circle of the rotor yoke 1, and on one side of the first hole portion 111a far from another first hole portion 111a in the same mounting hole group 11, mainly dispersing the radial force and circumferential force generated by the first permanent magnet 2 on the rotor yoke 1 to improve the strength of the rotor.

[0070] Alternatively, the position of the first vacant portion 111a2 can be set according to the stress analysis of the rotor yoke 1 when the rotor rotates, so as to disperse the acting force on the position with relatively large local stress of the rotor yoke 1, thereby improving the strength of the rotor. The embodiments of the present disclosure do not limit the number and specific positions of the first vacant portions 111a2.

[0071] In the embodiments of the present disclosure, the shapes of the first permanent magnet 2 and the first hole portion 111a can also be any other reasonable shapes, and the embodiments of the present disclosure do not limit this.

[0072] The second permanent magnet 3 and the second hole portion 111b

[0073] In a possible implementation manner, as Figure 2 shown, in a plane perpendicular to the axis of the rotor yoke 1, the cross-sectional shape of the second permanent magnet 3 is rectangular. That is: the second permanent magnet 3 is a cuboid.

[0074] The rectangular second permanent magnet 3 is more convenient for cutting and forming, which can effectively improve the operation convenience and operation efficiency.

[0075] In a possible implementation manner, as Figure 3 shown, the second hole portion 111b can have a second accommodating portion 111b1 and a second vacant portion 111b2, and the second accommodating portion 111b1 and the second vacant portion 111b2 are connected and communicate with each other.

[0076] The second permanent magnet 3 is located in the second accommodating portion 111b1. That is: in a plane perpendicular to the axis of the rotor yoke 1, the shape of the second accommodating portion 111b1 corresponds to the shape of the second permanent magnet 3.

[0077] When installing the second permanent magnet 3, the second permanent magnet 3 can be arranged in the second accommodating portion 111b1 in the second hole portion 111b to fit with the second accommodating portion 111b1. At this time, the second permanent magnet 3 is connected to the position of the rotor yoke 1 corresponding to the second accommodating portion 111b1, while the second vacant portion 111b2 separates the second permanent magnet 3 from the rotor yoke 1, so that some of their positions do not contact. In this way, the acting force generated by the second permanent magnet 3 on the rotor yoke 1 when the rotor rotates can be dispersed, avoiding the aggregation of its acting force to cause serious deformation of the rotor yoke 1, thereby improving the strength of the rotor.

[0078] As Figure 3 shown, the second vacant portion 111b2 can be located at a position away from the center of the circle of the rotor yoke 1 in the second hole portion 111b, and is used to disperse the radial acting force caused by the second permanent magnet 3 on the rotor yoke 1, so as to improve the strength of the rotor.

[0079] Alternatively, the position of the second vacant portion 111b2 can be set according to the stress analysis of the rotor yoke 1 when the rotor rotates, so as to disperse the acting forces on the positions with relatively large local stress of the rotor yoke 1, thereby improving the strength of the rotor. The embodiments of the present disclosure do not limit the number and specific positions of the second vacant portions 111b2.

[0080] In a possible implementation manner, the volumes of the second permanent magnet 3 and the first permanent magnet 2 can be reasonably planned according to the performance and cost of the rotor. The volume of the second permanent magnet 3 can be greater than the volume of the first permanent magnet 2, or the second permanent magnet 3 can also be less than or equal to the volume of the first permanent magnet 2. The embodiments of the present disclosure do not limit this.

[0081] In the embodiments of the present disclosure, as Figure 2 shown, it can be seen that the length directions of the first permanent magnet 2 and the second permanent magnet 3 located in the same first mounting hole 111 are not parallel. The length direction of the first permanent magnet 2 can be parallel to the radial direction of the rotor yoke 1 or not parallel. Similarly, the length direction of the second permanent magnet 3 can also be parallel to the radial direction of the rotor yoke 1 or not parallel. However, the included angle between the length direction of the first permanent magnet 2 and the length direction of the second permanent magnet 3 is not zero.

[0082] In this way, the acting forces of the first permanent magnet 2 on the rotor yoke 1 and the acting forces of the second permanent magnet 3 on the rotor yoke 1 during rotor rotation can also be dispersed, so that the acting forces of the first permanent magnet 2 on the rotor yoke 1 and the acting forces of the second permanent magnet 3 on the rotor yoke 1 are not forces in the same direction, thereby improving the strength of the rotor.

[0083] In the embodiments of the present disclosure, the shapes of the second permanent magnet 3 and the second hole portion 111b can also be any other reasonable shapes. The embodiments of the present disclosure do not limit this.

[0084] In the embodiments of the present disclosure, as Figure 2 shown, the rotor may further include a third permanent magnet 4.

[0085] As Figure 1 and Figure 3 shown, the rotor yoke 1 further has a plurality of second mounting holes 12 arranged circumferentially along the rotor yoke 1, and the positions of each second mounting hole 12 respectively correspond to the positions of different mounting hole groups 11.

[0086] Each third permanent magnet 4 is respectively located in a different second mounting hole and is connected to the rotor yoke 1. In this way, at the corresponding positions of the two first permanent magnets 2 and the two second permanent magnets 3 in each mounting hole group 11, a third permanent magnet 4 is further provided, which improves the torque density of the motor, reduces the back electromotive force harmonics, and reduces the torque ripple. Moreover, the saturation degree of the motor is reduced, thereby improving the stability of motor control.

[0087] In the embodiment of the present disclosure, the material of the third permanent magnet 4 may be ferrite, rare earth permanent magnet, etc., and the embodiment of the present disclosure does not limit this.

[0088] In a possible implementation manner, the second mounting hole 12 may be located between two second hole portions 111b in the mounting hole group 11 with corresponding positions, or the second mounting hole 12 is located on the side close to the center of the rotor yoke 1 of two first hole portions 111a in the mounting hole group 11 with corresponding positions.

[0089] In this way, after the third permanent magnet 4 is installed in the second mounting hole 12, the third permanent magnet 4 can produce a certain degree of shielding for the first permanent magnet 2 in different directions, reducing the direct influence of the armature reaction on the first permanent magnet 2, thereby improving the demagnetization resistance of the first permanent magnet 2.

[0090] In a possible implementation manner, as Figure 3 shown, the second mounting hole 12 may have a third accommodating portion 12a and a third vacant portion 12b, and the third accommodating portion 12a and the third vacant portion 12b are communicated with each other.

[0091] The third permanent magnet 4 is located in the third accommodating portion 12a. That is: on the plane perpendicular to the axis of the rotor yoke 1, the shape of the third accommodating portion 12a corresponds to the shape of the third permanent magnet 4.

[0092] When installing the third permanent magnet 4, the third permanent magnet 4 can be arranged in the third accommodating portion 12a of the second mounting hole 12 to fit with the third accommodating portion 12a. At this time, the third permanent magnet 4 is connected to the position of the rotor yoke 1 corresponding to the third accommodating portion 12a, while the third vacant portion 12b separates the third permanent magnet 4 from the rotor yoke 1, so that part of their positions do not contact. In this way, the acting force generated by the third permanent magnet 3 on the rotor yoke 1 during rotor rotation can be dispersed, avoiding the aggregation of its acting force to cause serious deformation of the rotor yoke 1, thereby improving the strength of the rotor.

[0093] As Figure 3 shown, the third vacant portion 12b is located at both ends of the second mounting hole 12 along the circumferential direction of the rotor yoke 1, and is used for dispersing the axial acting force caused by the third permanent magnet 4 on the rotor yoke 1 to improve the strength of the rotor.

[0094] Alternatively, the position of the third vacant portion 12b can be set according to the stress analysis of the rotor yoke 1 when the rotor rotates, so as to disperse the acting force on the position where the local stress of the rotor yoke 1 is relatively large, thereby improving the strength of the rotor. In the embodiments of the present disclosure, the number and specific position of the third vacant portion 12b are not limited.

[0095] In a possible implementation manner, the volume of the third permanent magnet 4 can be reasonably planned according to the performance and cost of the rotor. The embodiments of the present disclosure do not limit this.

[0096] In a possible implementation manner, the third permanent magnet 4 can have a cuboid structure, and the length direction of the cuboid structure is perpendicular to the radial direction of the rotor yoke 1. In this way, the first permanent magnet 2 can be shielded to a greater extent, the direct influence of the armature reaction on the first permanent magnet 2 can be reduced, and thus the demagnetization resistance of the first permanent magnet 2 is improved.

[0097] The embodiments of the present disclosure also provide a motor, which includes the rotor described in any one of the above. It may further include a motor housing, a stator, and a rotating shaft.

[0098] Both the rotor and the stator are located inside the motor housing. The stator is sleeved outside the rotor and fixedly connected to the motor housing. The rotor is rotatably connected to the motor housing. The rotating shaft can be located inside the rotor yoke 1 of the rotor and fixedly connected to the rotor yoke 1.

[0099] In this way, after the stator is energized, a magnetic circuit is generated between the stator and the first permanent magnet 2, the second permanent magnet 3, and the third permanent magnet 4 in the rotor, thereby causing the rotor to rotate relative to the motor housing. The rotor drives the rotating shaft to rotate, and the motor outputs torque outward through the rotating shaft.

[0100] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0101] The embodiments of the present disclosure provide a rotor. The two first inner walls m located between the two first hole portions 111a in the mounting hole group 11 are arranged in parallel, and the distance between the two first inner walls m is less than a preset distance. In this way, there is a relatively thin portion of the rotor yoke 1 between the two first mounting holes, which improves the strength of the rotor without affecting the performance of the rotor.

[0102] The meaning of the term "at least one" in this application is one or more, and the meaning of the term "a plurality" in this application is two or more.

[0103] In this application, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and effects. It should be understood that there is no logical or chronological dependency between "first" and "second", nor are the quantity and execution order limited. It should also be understood that although the following description uses terms such as "first" and "second" to describe various structures, these structures should not be limited by the terms. These terms are only used to distinguish one structure from another. For example, without departing from the scope of various examples, the first hole portion may be referred to as the second hole portion, and similarly, the second hole portion may be referred to as the first hole portion.

[0104] The above are only optional embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art in the technical field disclosed in this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A rotor, characterized in that, the rotor includes a rotor yoke (1), a plurality of first permanent magnets (2) and a plurality of second permanent magnets (3); the rotor yoke (1) has a disc structure, the rotor yoke (1) has a plurality of mounting hole groups (11) arranged circumferentially along the rotor yoke (1), the mounting hole group (11) includes two first mounting holes (111) symmetrically arranged along the radial direction of the rotor yoke (1), the first mounting hole (111) includes a first hole portion (111a) and a second hole portion (111b), the second hole portion (111b) is located on a side of the first hole portion (111a) away from the center of the rotor yoke (1), two first inner walls (m) between the two first hole portions (111a) in the mounting hole group (11) are arranged in parallel, and the distance between the two first inner walls (m) is less than a preset distance; each first permanent magnet (2) is respectively located in a different first hole portion (111a), and is in contact with the first inner wall (m) of the first hole portion (111a), and the first permanent magnet (2) is connected to the rotor yoke (1); each second permanent magnet (3) is respectively located in a different second hole portion (111b), and is connected to the rotor yoke (1).

2. The rotor according to claim 1, characterized in that, in a plane perpendicular to the axis of the rotor yoke (1), the cross-sectional shapes of the first permanent magnet (2) and the second permanent magnet (3) are polygons.

3. The rotor according to claim 2, characterized in that, in a plane perpendicular to the axis of the rotor yoke (1), each side of the cross-section of the first permanent magnet (2) is not parallel to any side of the second permanent magnet (3).

4. The rotor according to claim 3, characterized in that, in a plane perpendicular to the axis of the rotor yoke (1), the cross-sectional shape of the first permanent magnet (2) is a pentagon, the pentagon has four first side edges and one second side edge, and every two adjacent first side edges among the four first side edges are perpendicular to each other; the side surface corresponding to the second side edge is in contact with the first inner wall (m) of the first hole portion (111a).

5. The rotor according to claim 4, characterized in that, the first hole portion (111a) has a first accommodation portion (111a1) and a first vacant portion (111a2), and the first permanent magnet (2) is located in the first accommodation portion (111a1).

6. The rotor according to claim 3, characterized in that, in a plane perpendicular to the axis of the rotor yoke (1), the cross-sectional shape of the second permanent magnet (3) is a rectangle.

7. The rotor according to claim 6, characterized in that, the second hole portion (111b) has a second accommodation portion (111b1) and a second vacant portion (111b2), and the second permanent magnet (3) is located in the second accommodation portion (111b1).

8. The rotor according to claim 1, characterized in that, the rotor further includes a plurality of third permanent magnets (4); The rotor yoke (1) further has a plurality of second mounting holes (12) arranged circumferentially along the rotor yoke (1), and the positions of each of the second mounting holes (12) correspond to the positions of different mounting hole groups (11) respectively; Each third permanent magnet (4) is respectively located in a different second mounting hole (12) and is connected to the rotor yoke (1).

9. The rotor according to claim 8, wherein, the second mounting hole (12) is located between two second hole portions (111b) in the mounting hole group (11) with corresponding positions, or the second mounting hole (12) is located on the side closer to the center of the circle of the rotor yoke (1) of two first hole portions (111a) in the mounting hole group (11) with corresponding positions.

10. The rotor according to claim 9, wherein, the second mounting hole (12) has a third accommodating portion (12a) and a third vacant portion (12b), and the third permanent magnet (4) is located in the third accommodating portion (12a).

11. The rotor according to claim 8, wherein, the third permanent magnet (4) has a cuboid structure, and the length direction of the cuboid structure is perpendicular to the radial direction of the rotor yoke (1).

12. The rotor according to claim 1, wherein, the material of the first permanent magnet (2) is ferrite, and the material of the second permanent magnet (3) is rare earth permanent magnet.

13. An electric motor, wherein, the electric motor includes the rotor according to any one of claims 1 - 12.

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