Rotor assembly, permanent magnet motor, compressor and refrigeration equipment

Abstract

The present application provides a rotor assembly, a permanent magnet motor, a compressor, and a refrigeration device. Among them, the rotor assembly includes: a rotor core, the rotor core is provided with a central shaft hole, and a plurality of groups of magnet insertion holes are arranged around the central shaft hole. In a plane perpendicular to the axial direction, the middle part of each group of magnet insertion holes extends towards the direction close to the central shaft hole, and both ends extend towards the direction away from the central shaft hole; at least two groups of slits are symmetrically arranged on one side of each group of magnet insertion holes away from the central shaft hole. Each group of slits includes a first slit and a second slit, both extending towards the magnet insertion hole, and the second slit is located on the side of the first slit away from the other group of slits; a plurality of permanent magnets are respectively arranged in each group of magnet insertion holes; wherein, the distance between the first slit and the magnet insertion hole is less than the distance between the second slit and the magnet insertion hole. In the technical solution of the present application, the magnetic resistance generated by the slit can be effectively reduced, the utilization rate of the permanent magnet can be improved, which is beneficial to improving the operating efficiency and cost performance of the permanent magnet motor.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and more specifically, to a rotor assembly, a permanent magnet motor, a compressor, and a refrigeration device. Background Art

[0002] In a permanent magnet motor, the armature magnetic field generated by the stator interacts with the excitation magnetic field generated by the rotor to drive the rotor to rotate and output power. During the rotation of the rotor, the distortion of the magnetic field will cause an increase in multiple harmonics of the spatial air-gap magnetic field, and the harmonic content under the motor load is relatively large, which is likely to cause relatively large noise, and at the same time, it will lead to an increase in iron loss and a decrease in efficiency of the motor. In the prior art, slits are usually provided on the rotor core to improve the magnetic field direction, so as to reduce the harmonic content and reduce the vibration and noise. However, the slits in this solution are likely to cause an increase in the magnetic resistance of the permanent magnet magnetic circuit, resulting in a decrease in the utilization rate of the permanent magnet and a decrease in the cost performance of the permanent magnet motor. Summary of the Invention

[0003] According to an embodiment of the present application, it aims to at least improve one of the technical problems existing in the prior art or related technologies.

[0004] To this end, an object of an embodiment of the present application is to provide a rotor assembly.

[0005] Another object of an embodiment of the present application is to provide a permanent magnet motor.

[0006] Another object of an embodiment of the present application is to provide a compressor.

[0007] Another object of an embodiment of the present application is to provide a refrigeration device.

[0008] To achieve the above object, according to an embodiment of the first aspect of the present application, a rotor assembly is provided, including a rotor core, the rotor core is provided with a central shaft hole, and a plurality of groups of magnet insertion holes are arranged around the central shaft hole. In a plane perpendicular to the axial direction, the middle of each group of magnet insertion holes extends towards the direction close to the central shaft hole, and both ends extend towards the direction away from the central shaft hole; on one side of each group of magnet insertion holes away from the central shaft hole, at least two groups of slits are symmetrically arranged, each group of slits includes a first slit and a second slit, both extend towards the magnet insertion hole, and the second slit is located on the side of the first slit away from the other group of slits; a plurality of permanent magnets are respectively arranged in each group of magnet insertion holes; wherein, the distance between the first slit and the magnet insertion hole is less than the distance between the second slit and the magnet insertion hole.

[0009] According to an embodiment of the first aspect of the present application, the rotor assembly includes a rotor core and permanent magnets. The rotor core is a rotating body with a central shaft hole for assembling a rotating shaft through the central shaft hole. By providing multiple sets of magnet insertion holes on the rotor core, it is convenient to arrange the permanent magnets. The multiple sets of magnet insertion holes are arranged along the circumferential direction and form a uniform arrangement pattern around the central shaft hole; in a plane perpendicular to the axial direction, by setting both ends of each set of magnet insertion holes to extend away from the central shaft hole, that is, both ends of the magnet insertion holes are close to the outer peripheral side edge of the rotor core, and the middle part of each set of magnet insertion holes extends towards the central shaft hole, so that the magnet insertion holes form a structure similar to a V shape; a permanent magnet is arranged in each set of magnet insertion holes to achieve the assembly of the permanent magnet, so that the permanent magnet can rotate with the rotor core and generate an excitation magnetic field during rotation.

[0010] On one side of each set of magnet insertion holes away from the central shaft hole, by correspondingly providing at least two sets of slits to improve the magnetic field direction when the rotor assembly is assembled in a permanent magnet motor. Among them, the at least two sets of slits are symmetrically arranged along the circumferential direction. Each set of slits includes a first slit and a second slit extending towards the magnet insertion hole, and the second slit is located on the side of the first slit away from the other set of slits, so that the first slit corresponds to the middle part of the magnet insertion hole, and the second slit corresponds to both ends of the magnet insertion hole, so as to improve the magnetic field direction through the air gap generated by the slits when the rotor assembly rotates, reduce the harmonic content, and further reduce the vibration noise and iron loss. By setting the distance between the first slit and the magnet insertion hole in each set of slits to be less than the distance between the second slit and the magnet insertion hole, that is, the first slit is closer to the magnet insertion hole, to be adapted to the extension direction of the magnet insertion hole, the magnetic resistance generated by the slits can be reduced, the utilization rate of the permanent magnet can be improved, and it is beneficial to improve the performance-price ratio of the permanent magnet motor assembled with this rotor assembly.

[0011] It should be noted that four groups, six groups or eight groups of magnet insertion holes can be arranged around the central shaft hole. Of course, other numbers of magnet insertion holes can also be arranged, which can be specifically determined according to the actual size of the rotor core. Among them, each set of magnet insertion holes can be a through integral structure or composed of multiple sub-insertion holes.

[0012] In addition, the rotor assembly in the above technical solution provided in the embodiment of the present application may further have the following additional technical features:

[0013] In the above technical solution, the magnet jack includes two sub-jacks symmetrically arranged. In a plane perpendicular to the axial direction, one ends of the two sub-jacks close to each other extend towards the central shaft hole, and one ends of the two sub-jacks far from each other extend towards the outer peripheral edge of the rotor core; wherein, a set of slits is correspondingly arranged on one side of each sub-jack far from the central shaft hole. The distances from the first slit and the second slit of each set of slits to the outer peripheral edge of the rotor core are approximately equal, and the ratio of the distance from the first slit to the sub-jack to the distance from the second slit to the sub-jack is less than a first threshold, and the first threshold is in the range of 0.4 to 0.5.

[0014] In this technical solution, by setting that each set of magnet jacks includes two sub-jacks symmetrically arranged, the size of a single magnet jack can be reduced, the processing difficulty can be lowered, which is beneficial to improving the internal strength of the rotor core, and at the same time, the size of a single permanent magnet can also be reduced. In a plane perpendicular to the axial direction, at the middle position of the magnet jack, that is, one ends of the two sub-jacks close to each other, extend towards the direction close to the central shaft hole. Correspondingly, at both ends of the magnet jack, that is, one ends of the two sub-jacks far from each other, extend towards the direction close to the outer peripheral edge of the rotor core, so that the two sub-jacks are spliced into a structure similar to a V shape; a permanent magnet is arranged in each sub-jack, so that the two permanent magnets in each group form a layout form similar to a V shape to generate the required magnetic field.

[0015] Wherein, a set of slits is correspondingly arranged on each sub-jack. At one end close to the outer peripheral side of the rotor core, the distances from the first slit and the second slit of this set of slits to the outer peripheral edge of the rotor core are approximately equal or exactly equal; while at one end close to the magnet jack, the ratio of the distance from the first slit to the sub-jack to the distance from the second slit to the sub-jack of this set of slits is less than a first threshold, and 0.4 ≤ the first threshold ≤ 0.5, so that the length ratio of the first slit and the second slit is adapted to the size and extension direction of the sub-jack, and the improvement effect of the air gaps generated by the first slit and the second slit on the magnetic field direction generated by the permanent magnet is more obvious.

[0016] Further, the first threshold is specifically 0.44 to further enhance the improvement effect of the first slit and the second slit on the magnetic field of the permanent magnet, and the utilization rate of the permanent magnet is higher.

[0017] In the above technical solution, at one end of each set of slits close to the outer peripheral side of the rotor core, the first slit and the second slit are close to each other.

[0018] In this technical solution, at one end of each group of slits close to the outer peripheral side of the rotor core, by arranging the first slit and the second slit to be close to each other, that is, the first slit and the second slit are not parallel, and the second slit is inclined towards the first slit to be adapted to the outer peripheral side edge of the rotor core. It can be understood that the outer peripheral side edge of the rotor core is circular, and the second slit is located on the side of the first slit away from the other group of slits. Through the relatively inclined setting method, the space utilization rate can be improved, and the improvement effect on the magnetic field is more obvious.

[0019] In the above technical solution, a first included angle is formed between the first slit and the second slit, and the angle range of the first included angle is 15° to 20°.

[0020] In this technical solution, the relatively inclined setting makes a first included angle formed between the first slit and the second slit. By limiting 15° ≤ the first included angle ≤ 20°, the first included angle is within a suitable angle range, which can avoid the influence on the improvement effect of the slit on the magnetic field due to too large or too small inclination angle, and at the same time prevent the slit (especially the second slit) from being too close to the outer peripheral side edge of the rotor core and increasing the processing difficulty.

[0021] In the above technical solution, in each group of slits, the width of the first slit is greater than the width of the second slit, and the width of the first slit is less than or equal to 1.2 mm, and the width of the second slit is greater than or equal to 1 mm.

[0022] In this technical solution, by limiting the widths of the first slit and the second slit in each group of slits, the widths of the first slit and the second slit can meet the requirements. Specifically, 1 mm ≤ the width of the second slit < the width of the first slit ≤ 1.2 mm, so that the difference in width between the first slit and the second slit is kept within the range of 0.2 mm to prevent abnormal mutual interference of the air gaps generated due to the large difference in their widths.

[0023] In the above technical solution, in each group of slits, the minimum distance between the first slit and the second slit is 2.5 to 3 times the width of the first slit.

[0024] In this technical solution, the distances between different positions of the first slit and the second slit in each group of slits are different. By setting the value range of the minimum distance between the first slit and the second slit to be 2.5 to 3 times the width of the first slit, a suitable distance is maintained between the first slit and the second slit. On the one hand, it is beneficial to the magnetic field of the permanent magnet through the combined action of the first slit and the second slit to improve the magnetic field direction. On the other hand, it is convenient for reasonable layout in a limited space and is also convenient for processing.

[0025] In the above technical solution, the rotor core includes a plurality of core layers arranged in the axial direction, and two adjacent core layers are connected to each other and form a press fit; wherein, the distances between the first slit and the second slit and the outer peripheral side of the rotor core are greater than twice the thickness of the core layer.

[0026] In this technical solution, the rotor core includes a plurality of core layers. By stacking a plurality of core layers in the axial direction and making the adjacent core layers in press fit, the overall rotor core is formed to increase the magnetic flux density between two magnetic poles. At the same time, an insulating layer is provided on the surface of each core layer to prevent power loss caused by eddy currents generated during use. Among them, by setting the distances between the first slit and the second slit to the outer peripheral side edge of the rotor core to be greater than twice the thickness of a single core layer, the connection part between the outer peripheral side edge and the slit can have a certain strength, preventing the connection part from breaking due to the too small distance between the slit and the outer peripheral side edge.

[0027] In the above technical solution, in a plane perpendicular to the axial direction, the first slit includes a plurality of sub-slits arranged at intervals along the length direction, and the interval between two adjacent sub-slits is not less than 0.4 mm.

[0028] In this technical solution, limited by the existing processing technology, it is difficult to directly process a through first slit in a small space on the rotor core. By setting the first slit to include a plurality of sub-slits, and the plurality of sub-slits are arranged at intervals along the length direction in a plane perpendicular to the axial direction and spliced to form the first slit, the length of a single first slit can be reduced, which is beneficial to reducing the processing difficulty, and at the same time, the internal strength of the rotor core can be maintained. Among them, by setting the interval between two adjacent sub-slits to be not less than 0.4 mm, the requirements of the existing processing accuracy are met, preventing the connection part from breaking due to too small an interval.

[0029] In the above technical solution, in a plane perpendicular to the axial direction, there is a gap between the end of each sub-socket and the permanent magnet located in the sub-socket.

[0030] In this technical solution, in a plane perpendicular to the axial direction, by setting there to be distances between both ends of the permanent magnet and both ends of the sub-socket, the permanent magnet is kept at a reasonable distance from the outer peripheral side edge of the rotor core. At the same time, the two permanent magnets in the two sub-slits are also kept at a reasonable distance, so that the magnetic field generated by the permanent magnet can meet the working requirements of the permanent magnet motor and interact with the magnetic field of the stator assembly to drive the rotation of the rotor assembly.

[0031] In the above technical solution, a magnetic groove is provided at one end of each sub-socket close to the outer peripheral side of the rotor core, and the magnetic groove extends along the circumferential direction of the rotor core towards the side close to the corresponding second slit.

[0032] In this technical solution, a magnetic slot extending in the circumferential direction is provided at one end of the sub-hole close to the outer circumference of the rotor core, so as to utilize the magnetic slot and the corresponding slit to further improve the magnetic field direction of the permanent magnet, and the utilization rate of the permanent magnet is higher. The magnetic slot extends to the side close to the corresponding second slit to fully utilize the edge space, so that the air gap generated by the magnetic slot and the second slit can cooperate with each other to produce a positive effect.

[0033] In an embodiment of the second aspect of the present application, a permanent magnet motor is provided, comprising: a stator assembly; and a rotor assembly according to any one of the embodiments of the first aspect, coaxially arranged in the stator assembly.

[0034] According to an embodiment of the second aspect of the present application, the permanent magnet motor includes a stator assembly and a rotor assembly in the embodiment of the first aspect described above. The rotor assembly is arranged inside the stator assembly, and the rotor assembly is arranged coaxially with the stator assembly, so that the magnetic field generated by the permanent magnet of the rotor assembly interacts with the magnetic field generated by the stator assembly, driving the rotor assembly to rotate relative to the stator assembly, thereby outputting a torque. Among them, in the rotor assembly, the slits arranged on the rotor core can adjust the magnetic field generated by the permanent magnet, improve the direction of the magnetic field, reduce the vibration noise and iron loss of the permanent magnet motor, and at the same time, reduce the magnetic resistance, improve the utilization rate of the permanent magnet, and thus improve the working efficiency and cost performance of the permanent magnet motor.

[0035] In addition, the permanent magnet motor in this solution also has all the beneficial effects of the rotor assembly in any one of the above-mentioned first aspect embodiments, which will not be repeated here.

[0036] A compressor is provided in an embodiment of the third aspect of the present application, comprising: a shell; a permanent magnet motor of the embodiment of the above-mentioned second aspect, disposed in the shell; a compression pump assembly, disposed in the shell and drivingly connected to the rotor assembly of the permanent magnet motor.

[0037] According to an embodiment of the third aspect of the present application, the compressor includes a housing, the permanent magnet motor in the embodiment of the second aspect, and a compression pump assembly. The permanent magnet motor and the compression pump assembly are both arranged in the housing, and the compression pump assembly is transmission-connected to the rotor assembly of the permanent magnet motor, so that when the permanent magnet motor is working, the rotation of the rotor assembly drives the compression pump assembly to work, thereby compressing the refrigerant.

[0038] In addition, the compressor in this solution also has all the beneficial effects of the permanent magnet motor in the above-mentioned second aspect embodiment, which will not be repeated here.

[0039] According to an embodiment of a fourth aspect of the present application, a refrigeration device is provided, including a device body, in which a refrigeration system is arranged, and the refrigeration system includes a compressor of the embodiment of the third aspect mentioned above.

[0040] According to an embodiment of the fourth aspect of the present application, a refrigeration device includes a device body and a refrigeration system for performing a refrigeration operation using the refrigeration system. Among them, the refrigeration system includes a compressor in the embodiment of the third aspect above to compress a refrigerant using the compressor so that the state of the refrigerant meets the requirements of the refrigeration system.

[0041] It should be noted that the refrigeration device includes, but is not limited to, air conditioners, refrigerators, and freezers.

[0042] In addition, the refrigeration device in this solution also has all the beneficial effects of the compressor in the embodiment of the third aspect above, which will not be elaborated here.

[0043] The additional aspects and advantages in the embodiments of the present application will become apparent in the following description section or be learned through the practice of the present application. Brief Description of the Drawings

[0044] In the embodiments of the present application, the above and / or additional aspects and advantages will become apparent and be easily understood from the description of the embodiments in conjunction with the following drawings, where:

[0045] Figure 1 A schematic diagram of a rotor assembly according to an embodiment of the present application is shown;

[0046] Figure 2 A schematic diagram of a rotor assembly according to an embodiment of the present application is shown;

[0047] Figure 3 A partial schematic diagram of a rotor assembly according to an embodiment of the present application is shown;

[0048] Figure 4 A schematic diagram of a rotor core according to an embodiment of the present application is shown;

[0049] Figure 5 A comparison diagram of load air-gap distortion according to an embodiment of the present application is shown;

[0050] Figure 6 A comparison diagram of core loss under rated load according to an embodiment of the present application is shown;

[0051] Figure 7 A schematic diagram of a permanent magnet motor according to an embodiment of the present application is shown;

[0052] Figure 8 A schematic block diagram of a compressor according to an embodiment of the present application is shown;

[0053] Figure 9 A schematic block diagram of a refrigeration device according to an embodiment of the present application is shown.

[0054] Among them, Figures 1 to 9The corresponding relationship between the reference signs and the component names in the drawings is as follows:

[0055] 1 Rotor assembly, 11 Rotor core, 111 Central shaft hole, 112 Magnetic hole, 1121 Sub jack, 1122 Magnetic slot, 1131 First slit, 1132 Second slit, 1133 Sub slit, 12 Permanent magnet, 2 Permanent magnet motor, 21 Stator assembly, 3 Compressor, 31 Housing, 32 Compression pump assembly, 4 Refrigeration equipment, 41 Equipment body, 42 Refrigeration system. Detailed implementation manners

[0056] In order to more clearly understand the above objects, features, and advantages in the embodiments according to the present application, the embodiments according to the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0057] Many specific details are set forth in the following description in order to fully understand the embodiments according to the present application. However, the embodiments according to the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0058] Next, refer to Figures 1 to 9 Describe the rotor assembly, permanent magnet motor, compressor, and refrigeration equipment according to some embodiments of the present application.

[0059] Embodiment 1

[0060] In this embodiment, a rotor assembly 1 is provided. As Figure 1 shown, the rotor assembly 1 includes a rotor core 11 and a permanent magnet 12.

[0061] The rotor core 11 is a rotating body and has a central shaft hole 111 for assembling a rotating shaft through the central shaft hole 111. A plurality of groups of magnetic holes 112 (i.e., magnet jacks) are provided on the rotor core 11 to provide an installation space for the permanent magnet 12.

[0062] In a plane perpendicular to the axial direction, the plurality of groups of magnetic holes 112 are arranged along the circumferential direction and form a uniform arrangement form around the central shaft hole 111. The number of the magnetic holes 112 may be Figure 1 as shown, six groups.

[0063] Among them, both ends of each group of magnetic holes 112 extend in a direction away from the central shaft hole 111, that is, both ends of the magnetic holes 112 are close to the outer peripheral side edge of the rotor core 11; while the middle part of each group of magnetic holes 112 extends in a direction close to the central shaft hole 111, so that the magnetic holes 112 as a whole form a structure similar to a V shape.

[0064] A permanent magnet 12 is arranged in each set of magnetic holes 112 to utilize the magnetic holes 112 to realize the assembly of the permanent magnet 12; when the rotor core 11 rotates, the permanent magnet 12 can rotate together with the rotor core 11 and generate an excitation magnetic field during the rotation process.

[0065] On one side of each set of magnetic holes 112 away from the central axis hole 111, at least two sets of slits are symmetrically arranged in the circumferential direction to improve the magnetic field direction when the rotor assembly 1 is assembled in the permanent magnet motor. As Figure 1 shown, two sets of slits can be correspondingly arranged for each set of magnetic holes 112.

[0066] Among them, each set of slits includes a first slit 1131 and a second slit 1132 extending towards the magnetic hole 112; the second slit 1132 is located on the side of the first slit 1131 away from the other set of slits, so that the first slit 1131 corresponds to the middle part of the magnetic hole 112, and the second slit 1132 corresponds to the end part of the magnetic hole 112. When the rotor assembly 1 rotates, the air gap generated by the slits improves the magnetic field direction, reduces the harmonic content, and further reduces the vibration noise and iron loss.

[0067] The distances from the first slit 1131 and the second slit 1132 of each set of slits to the magnetic hole 112 are different. Specifically, the distance between the first slit 1131 and the magnetic hole 112 is the first distance L1, and the distance between the second slit 1132 and the magnetic hole 112 is the second distance L2, and the first distance L1 < the second distance L2, so that the first slit 1131 is closer to the magnetic hole 112 to adapt to the extension direction of the magnetic hole 112.

[0068] Through the above arrangement form of the first slit 1131 and the second slit 1132, the magnetic resistance generated by the slits can be effectively reduced, and the utilization rate of the permanent magnet 12 can be improved, which is beneficial to improving the operation efficiency and cost performance of the permanent magnet motor assembled with the rotor assembly 1.

[0069] It should be noted that the number of groups of magnetic holes 112 and slits is not limited to the quantity in this embodiment. Four groups, eight groups or other groups of magnetic holes 112 can also be arranged around the central axis hole 111, and multiple groups of slits can also be correspondingly arranged for each group of magnetic holes 112.

[0070] In addition, each group of magnetic holes 112 can be a through integral structure, or can be spliced by two or more sub-insertion holes 1121.

[0071] Embodiment Two

[0072] In this embodiment, a rotor assembly 1 is provided, which is further improved on the basis of Embodiment One.

[0073] As Figure 1 and Figure 2As shown, each group of magnetic holes 112 includes two sub-insert holes 1121. The two sub-insert holes 1121 are symmetrically arranged and spliced into a magnetic hole 112, which can reduce the size of a single magnetic hole 112, reduce the processing difficulty, and is beneficial to improving the internal strength of the rotor core 11. At the same time, a permanent magnet 12 is respectively arranged in each of the two sub-insert holes 1121, which can also reduce the size of a single permanent magnet 12 and is beneficial to simplifying the structure of the permanent magnet 12.

[0074] Specifically, in a plane perpendicular to the axial direction, the middle position of the magnetic hole 112 corresponds to one end where the two sub-insert holes 1121 are close to each other and extends towards the direction of the central shaft hole 111, and the two ends of the magnetic hole 112 correspond to one end where the two sub-insert holes 1121 are far from each other and extend towards the direction of the outer peripheral side edge of the rotor core 11. The magnetic hole 112 formed by splicing the two sub-insert holes 1121 as a whole forms a structure similar to a V shape.

[0075] A permanent magnet 12 is arranged in each sub-insert hole 1121, so that the arrangement form of the two permanent magnets in each group is the same as that of the two sub-insert holes 1121, and also forms a layout form similar to a V shape, so that the magnetic field generated by the permanent magnet 12 meets the working requirements of the permanent magnet motor.

[0076] As Figure 2 shown, each sub-insert hole 1121 is correspondingly provided with a group of slits, and the two groups of slits are symmetrically arranged. At one end close to the outer peripheral side of the rotor core 11, the distances between the first slit 1131 and the second slit 1132 of each group of slits and the outer peripheral side edge of the rotor core 11 are approximately equal or exactly equal. While at one end close to the magnetic hole 112, the ratio of the distance between the first slit 1131 and the sub-insert hole 1121 to the distance between the second slit 1132 and the sub-insert hole 1121 is less than a first threshold value, and 0.4 ≤ the first threshold value ≤ 0.5.

[0077] The above settings can make the length ratio of the first slit 1131 and the second slit 1132 adapt to the size and extension direction of the sub-insert hole 1121, and the improvement effect of the air gaps generated by the first slit 1131 and the second slit 1132 on the magnetic field direction generated by the permanent magnet 12 is more obvious.

[0078] Furthermore, when the first threshold value is 0.44, the distance from the first slit 1131 to the sub-insert hole 1121 can further enhance the improvement effect of the first slit 1131 and the second slit 1132 on the magnetic field of the permanent magnet 12, and the utilization rate of the permanent magnet 12 is higher.

[0079] Embodiment Three

[0080] In this embodiment, a rotor assembly 1 is provided, which is further improved on the basis of Embodiment Two.

[0081] AsFigures 1 to 3 As shown, the first slit 1131 and the second slit 1132 of each group of slits are arranged non-parallelly; at one end of each group of slits close to the outer peripheral side of the rotor core 11, the first slit 1131 and the second slit 1132 are close to each other, that is, the second slit 1132 inclines towards the first slit 1131 to adapt to the outer peripheral side edge of the rotor core 11.

[0082] It can be understood that the outer peripheral side edge of the rotor core 11 is circular, and the second slit 1132 is located on the side of the first slit 1131 far from the other group of slits, and the position corresponding to the sub-socket 1121 and the second slit 1132 also extends towards the outer peripheral side edge of the rotor core 11, so that the space at the position where the second slit 1132 is located is relatively small. Through the above-mentioned relatively inclined setting method, the space can be reasonably utilized, the space utilization rate can be improved, the arrangement form of the second slit 1132 can be adapted to the sub-socket 1121 and the outer peripheral side edge of the rotor core 11, and the improvement effect on the magnetic field is more obvious.

[0083] Furthermore, as Figure 3 shown, the relatively inclined setting makes a first included angle θ formed between the first slit 1131 and the second slit 1132. Among them, 15° ≤ the first included angle θ ≤ 20°, so that the first included angle θ is within a suitable angle range. The above setting can avoid the inclination angle of the second slit 1132 relative to the first slit 1131 being too large or too small, which affects the improvement effect of the slit on the magnetic field, and at the same time can also prevent the slit (especially the second slit 1132) from being too close to the outer peripheral side edge of the rotor core 11, increasing the processing difficulty.

[0084] Embodiment Four

[0085] In this embodiment, a rotor assembly 1 is provided, which is further improved on the basis of Embodiment Three, and the widths of the first slit 1131 and the second slit 1132 of each group of slits are limited so that the widths of the first slit 1131 and the second slit 1132 can meet the requirements.

[0086] As Figures 1 to 3 shown, the width of the first slit 1131 is w1, and the width of the second slit 1132 is w2. Among them, the width w2 of the second slit 1132 is less than the width w1 of the first slit 1131. Specifically, 1 mm ≤ the width w2 of the second slit 1132 < the width w1 of the first slit 1131 ≤ 1.2 mm, which can keep the difference between the widths of the first slit 1131 and the second slit 1132 within the range of 0.2 mm, that is, the difference between the width w1 of the first slit 1131 and the width w2 of the second slit 1132 is relatively small, so as to prevent the abnormal mutual interference of the air gaps generated due to the large difference in their widths.

[0087] Embodiment Five

[0088] In this embodiment, a rotor assembly 1 is provided, which is further improved on the basis of Embodiment III.

[0089] As Figures 1 to 3 shown, for the first slit 1131 and the second slit 1132 of each group of slits, the distances between different parts are different. Among them, there is a minimum distance d between the first slit 1131 and the second slit 1132, and the value range of the minimum distance d is 2.5 times to 3 times the width w1 of the first slit 1131.

[0090] The above setting of the minimum distance d can keep a proper distance between the first slit 1131 and the second slit 1132. The first slit 1131 and the second slit 1132 can jointly act on the magnetic field of the permanent magnet 12 to improve the magnetic field direction. At the same time, it is convenient to make a reasonable arrangement in a limited space, can prevent waste of space caused by too large a distance between the first slit 1131 and the second slit 1132, and is also convenient for the processing operations of the first slit 1131 and the second slit 1132.

[0091] Embodiment VI

[0092] In this embodiment, a rotor assembly 1 is provided, which is further improved on the basis of Embodiment III.

[0093] The rotor core 11 includes a plurality of core layers, and the plurality of core layers are stacked in the axial direction, and adjacent core layers are connected to each other and tightly fitted to form the whole rotor core 11. Among them, the core layer can be a silicon steel sheet. By forming the rotor core 11 with multiple layers of stacked silicon steel sheets, the magnetic flux density between the two magnetic poles of the rotor core 11 can be improved.

[0094] During the processing, an insulating layer is provided on the surface of each core layer, which can prevent power loss caused by eddy currents generated when the rotor assembly 1 is working.

[0095] Among them, as Figures 1 to 3 shown, the distances from the first slit 1131 and the second slit 1132 to the outer peripheral side edge of the rotor core 11 are greater than twice the thickness of a single core layer, which can enable the connection part between the outer peripheral side edge of the rotor core 11 and the slit to have a certain strength, so as to prevent the connection part from breaking due to too small a distance between the slit and the outer peripheral side edge, and to avoid affecting the reliability of the rotor core 11.

[0096] Embodiment VII

[0097] In this embodiment, a rotor assembly 1 is provided, which is further improved on the basis of Embodiment III.

[0098] As Figures 1 to 4As shown, the first slit 1131 includes a plurality of sub-slits 1133, and the plurality of sub-slits 1133 are arranged at intervals in the length direction within a plane perpendicular to the axial direction. Specifically, each first slit 1131 includes two sub-slits 1133, and the two sub-slits 1133 are spliced to form the first slit 1131, so as to reduce the length of a single first slit 1131, which is beneficial to reducing the processing difficulty and at the same time enabling the inside of the rotor core 11 to maintain a certain strength.

[0099] Wherein, in the length direction of the first slit 1131, the interval between two adjacent sub-slits 1133 is not less than 0.4 mm, so as to meet the requirements of existing processing precision, reduce the processing difficulty, and prevent the connection between the two sub-slits 1133 from breaking due to too small an interval.

[0100] It can be understood that usually, limited by the processing technology, it is difficult to directly process the through first slit 1131 in a small space on the rotor core 11; and in the case of arranging a plurality of sub-slits 1133, if the interval between adjacent sub-slits 1133 is too small, it is not easy to ensure the processing precision during processing and it is difficult to meet the design requirements.

[0101] It should be noted that the number of sub-slits 1133 is not limited to two in this embodiment, and each first slit 1131 may also include other numbers of sub-slits 1133.

[0102] Embodiment Eight

[0103] In this embodiment, a rotor assembly 1 is provided, which is further improved on the basis of Embodiment Three.

[0104] As Figures 1 to 3 shown, within a plane perpendicular to the axial direction, a permanent magnet 12 is provided in each sub-socket 1121. Wherein, there are intervals at both ends of each permanent magnet 12 and both ends of the sub-socket 1121, so that the permanent magnet 12 maintains a reasonable distance from the outer peripheral side edge of the rotor core 11. At the same time, a reasonable distance is also maintained between the two permanent magnets 12 in the two sub-slits 1133, so that the magnetic field generated by the permanent magnet 12 can meet the working requirements of the permanent magnet motor.

[0105] When the rotor assembly 1 is assembled to the permanent magnet motor, the rotor assembly 1 is driven to rotate by the interaction between the magnetic field generated by the permanent magnet 12 and the magnetic field of the stator assembly.

[0106] Furthermore, at one end of each sub-socket 1121 close to the outer peripheral side of the rotor core 11, a magnetic groove 1122 extending in the circumferential direction is provided; when the rotor assembly 1 is working, the magnetic groove 1122 can cooperate with the corresponding slit to further improve the magnetic field direction of the permanent magnet 12 and further improve the utilization rate of the permanent magnet 12.

[0107] Among them, in the circumferential direction of the rotor core 11, the magnetic slots 1122 extend toward the side close to the corresponding second slit 1132, so as to make full use of the edge space of the rotor core 11, enable the air gaps generated by the magnetic slots 1122 and the second slits 1132 to cooperate with each other, produce a beneficial effect, and jointly improve the magnetic field of the permanent magnet 12.

[0108] The following provides a specific embodiment of the above-mentioned rotor assembly 1:

[0109] In this embodiment, a rotor assembly 1 is provided. As Figure 1 shown, the rotor assembly 1 includes a rotor core 11 and a permanent magnet 12.

[0110] The rotor core 11 is a rotating body and has a central shaft hole 111 for assembling a rotating shaft through the central shaft hole 111. A plurality of groups of magnetic holes 112 (i.e., magnet insertion holes) are provided on the rotor core 11 to provide an installation space for the permanent magnet 12.

[0111] In a plane perpendicular to the axial direction, the plurality of groups of magnetic holes 112 are arranged along the circumferential direction and form a uniform arrangement form around the central shaft hole 111. The number of the magnetic holes 112 can be Figure 1 as shown, six groups.

[0112] Among them, both ends of each group of magnetic holes 112 extend away from the central shaft hole 111, that is, both ends of the magnetic holes 112 are close to the outer peripheral side edge of the rotor core 11; while the middle part of each group of magnetic holes 112 extends toward the central shaft hole 111, so that the magnetic holes 112 as a whole form a structure similar to a V shape.

[0113] A permanent magnet 12 is arranged in each group of magnetic holes 112 to realize the assembly of the permanent magnet 12 by using the magnetic holes 112; when the rotor core 11 rotates, the permanent magnet 12 can rotate together with the rotor core 11 and generate an excitation magnetic field during the rotation process.

[0114] On the side of each group of magnetic holes 112 away from the central shaft hole 111, at least two groups of slits are symmetrically arranged along the circumferential direction to improve the magnetic field direction when the rotor assembly 1 is assembled in a permanent magnet motor. As Figure 1 shown, two groups of slits can be correspondingly arranged for each group of magnetic holes 112.

[0115] Among them, each group of slits includes a first slit 1131 extending toward the magnetic hole 112 and a second slit 1132; the second slit 1132 is located on the side of the first slit 1131 away from another group of slits, so that the first slit 1131 corresponds to the middle part of the magnetic hole 112, and the second slit 1132 corresponds to the end part of the magnetic hole 112. When the rotor assembly 1 rotates, the air gap generated by the slits improves the magnetic field direction, reduces the harmonic content, and further reduces the vibration noise and iron loss.

[0116] For each group of slits, the distances from the first slit 1131 and the second slit 1132 to the magnetic hole 112 are different. The distance between the first slit 1131 and the magnetic hole 112 is the first distance L1, and the distance between the second slit 1132 and the magnetic hole 112 is the second distance L2, and the first distance L1 < the second distance L2, so that the first slit 1131 is closer to the magnetic hole 112 to adapt to the extending direction of the magnetic hole 112.

[0117] As Figure 1 and Figure 2 shown, each group of magnetic holes 112 includes two sub-insertion holes 1121, and the two sub-insertion holes 1121 are symmetrically arranged and spliced into a magnetic hole 112, which can reduce the size of a single magnetic hole 112, reduce the processing difficulty, and is beneficial to improving the internal strength of the rotor core 11; at the same time, a permanent magnet 12 is respectively arranged in each of the two sub-insertion holes 1121, which can also reduce the size of a single permanent magnet 12 and is beneficial to simplifying the structure of the permanent magnet 12.

[0118] Specifically, in the plane perpendicular to the axial direction, the middle position of the magnetic hole 112 corresponds to the end where the two sub-insertion holes 1121 are close to each other and extends in the direction close to the central shaft hole 111, and the two ends of the magnetic hole 112 correspond to the end where the two sub-insertion holes 1121 are far from each other and extend in the direction close to the outer peripheral side edge of the rotor core 11; the magnetic hole 112 formed by splicing the two sub-insertion holes 1121 as a whole forms a structure similar to a V shape.

[0119] A permanent magnet 12 is arranged in each sub-insertion hole 1121, so that the setting form of the two permanent magnets in each group is the same as that of the two sub-insertion holes 1121, and also forms a layout form similar to a V shape, so that the magnetic field generated by the permanent magnet 12 meets the working requirements of the permanent magnet motor.

[0120] As Figure 2 shown, each sub-insertion hole 1121 is correspondingly provided with a group of slits, and the two groups of slits are symmetrically arranged. At one end close to the outer peripheral side of the rotor core 11, the distances from the first slit 1131 and the second slit 1132 of each group of slits to the outer peripheral side edge of the rotor core 11 are approximately equal or exactly equal; while at one end close to the magnetic hole 112, the ratio of the distance between the first slit 1131 of each group of slits and the sub-insertion hole 1121 to the distance between the second slit 1132 and the sub-insertion hole 1121 is less than a first threshold value, and 0.4 ≤ the first threshold value ≤ 0.5.

[0121] Furthermore, the first threshold value is 0.44, which can make the distance from the first slit 1131 to the sub-insertion hole 1121.

[0122] The above settings can make the length ratio of the first slit 1131 and the second slit 1132 adapt to the size and extension direction of the sub-socket 1121. The improvement effect of the air gap generated by the first slit 1131 and the second slit 1132 on the magnetic field direction generated by the permanent magnet 12 is more obvious, and the utilization rate of the permanent magnet 12 is higher.

[0123] As Figures 1 to 3 shown, the first slit 1131 and the second slit 1132 of each group of slits are not arranged in parallel; at one end of each group of slits close to the outer peripheral side of the rotor core 11, the first slit 1131 and the second slit 1132 are close to each other, that is, the second slit 1132 inclines towards the first slit 1131 to adapt to the outer peripheral side edge of the rotor core 11.

[0124] The outer peripheral side edge of the rotor core 11 is circular, and the second slit 1132 is located on the side of the first slit 1131 away from the other group of slits, and the position of the sub-socket 1121 corresponding to the second slit 1132 also extends towards the outer peripheral side edge of the rotor core 11, making the space at the position where the second slit 1132 is located relatively small. Through the above relatively inclined setting method, the space can be reasonably utilized, the space utilization rate can be improved, the arrangement form of the second slit 1132 can be adapted to the sub-socket 1121 and the outer peripheral side edge of the rotor core 11, and the improvement effect on the magnetic field is also more obvious.

[0125] Furthermore, as Figure 3 shown, the relatively inclined setting makes a first included angle θ formed between the first slit 1131 and the second slit 1132. Among them, 15° ≤ the first included angle θ ≤ 20°, making the first included angle θ within a suitable angle range. The above settings can avoid the inclination angle of the second slit 1132 relative to the first slit 1131 being too large or too small, which affects the improvement effect of the slit on the magnetic field, and at the same time can also prevent the slit (especially the second slit 1132) from being too close to the outer peripheral side edge of the rotor core 11, increasing the processing difficulty.

[0126] As Figures 1 to 3 shown, the width of the first slit 1131 is w1, and the width of the second slit 1132 is w2. Among them, the width w2 of the second slit 1132 is less than the width w1 of the first slit 1131. Specifically, 1mm ≤ the width w2 of the second slit 1132 < the width w1 of the first slit 1131 ≤ 1.2mm, which can keep the width difference between the first slit 1131 and the second slit 1132 within the range of 0.2mm, that is, the width w1 of the first slit 1131 and the width w2 of the second slit 1132 differ relatively little, so as to prevent the air gaps generated by the large difference in their widths from interfering abnormally with each other.

[0127] As Figures 1 to 3As shown, for the first slit 1131 and the second slit 1132 of each group of slits, the distances between different parts are different. Among them, there is a minimum distance d between the first slit 1131 and the second slit 1132, and the value range of the minimum distance d is 2.5 to 3 times the width w1 of the first slit 1131.

[0128] The above setting of the minimum distance d can keep a proper distance between the first slit 1131 and the second slit 1132. The first slit 1131 and the second slit 1132 can jointly act on the magnetic field of the permanent magnet 12 to improve the magnetic field direction. At the same time, it is convenient to make a reasonable arrangement in a limited space, which can prevent waste of space caused by too large a distance between the first slit 1131 and the second slit 1132, and is also convenient for the processing operation of the first slit 1131 and the second slit 1132.

[0129] The rotor core 11 includes a plurality of core layers, and the plurality of core layers are stacked in the axial direction, and adjacent core layers are connected to each other and tightly fitted to form the whole rotor core 11. Among them, the core layer can be a silicon steel sheet. By forming the rotor core 11 with multiple layers of stacked silicon steel sheets, the magnetic flux density between the two magnetic poles of the rotor core 11 can be improved. During the processing, an insulating layer is provided on the surface of each core layer to prevent power loss caused by eddy currents generated when the rotor assembly 1 is working.

[0130] As Figures 1 to 3 shown, the distances from the first slit 1131 and the second slit 1132 to the outer peripheral side edge of the rotor core 11 are greater than twice the thickness of a single core layer, which can enable the connection part between the outer peripheral side edge of the rotor core 11 and the slit to have a certain strength, so as to prevent the connection part from breaking due to too small a distance between the slit and the outer peripheral side edge, and to avoid affecting the reliability of the rotor core 11.

[0131] In another implementation manner of this embodiment, as Figures 1 to 4 shown, the first slit 1131 includes a plurality of sub-slits 1133, and the plurality of sub-slits 1133 are arranged at intervals along the length direction in a plane perpendicular to the axial direction. Specifically, each first slit 1131 includes two sub-slits 1133, and the two sub-slits 1133 are spliced to form the first slit 1131, so as to reduce the length of a single first slit 1131, which is beneficial to reducing the processing difficulty and can keep a certain strength inside the rotor core 11 at the same time.

[0132] Among them, in the length direction of the first slit 1131, the interval between two adjacent sub-slits 1133 is not less than 0.4 mm to meet the requirements of existing processing accuracy, reduce the processing difficulty, and prevent the connection part between the two sub-slits 1133 from breaking due to too small an interval.

[0133] In the rotor assembly 1 of this embodiment, by improving the arrangement form of the first slit 1131 and the second slit 1132, the magnetic resistance generated by the slits can be effectively reduced, the utilization rate of the permanent magnet 12 can be improved, which is beneficial to improving the operating efficiency and cost performance of the permanent magnet motor equipped with this rotor assembly 1.

[0134] For example, Figure 5 shows a comparison chart of the experimental data of the load air-gap distortion during the working process of the rotor assembly 1 in this embodiment and a rotor in the prior art. Among them, in the rotor of the prior art, a plurality of parallel slits are provided on the side of the magnetic hole far from the central axis hole, and the distance between each slit and the magnetic hole is equal. From Figure 5 the experimental data, it can be seen that the load air-gap distortion of the rotor in the prior art reaches 31.48%, while the load air-gap distortion of the rotor assembly 1 in this embodiment is only 23.11%, which is much lower than that of the rotor in the prior art.

[0135] Furthermore, Figure 6 shows a comparison chart of the experimental data of the core loss of the rotor assembly 1 in this embodiment and the rotor in the above prior art under the rated load. From Figure 6 the experimental data, it can be seen that the core loss of the rotor in the prior art is close to 180, while the core loss of the rotor assembly 1 in this embodiment is only about 145. Compared with the rotor in the prior art, the reduction amplitude of the core loss is close to 20%, and the improvement is relatively obvious.

[0136] Embodiment Nine

[0137] In this embodiment, a permanent magnet motor 2 is provided. As shown in Figure 1 and Figure 7 , the permanent magnet motor 2 includes a stator assembly 21 and the rotor assembly 1 in any of the above embodiments.

[0138] The rotor assembly 1 is arranged inside the stator assembly 21, and the rotor assembly 1 and the stator assembly 21 are coaxially arranged. When the permanent magnet motor 2 works, the magnetic field generated by the permanent magnet 12 of the rotor assembly 1 interacts with the magnetic field generated by the stator assembly 21, and drives the rotor assembly 1 to rotate relative to the stator assembly 21, thereby outputting torque.

[0139] Among them, on the rotor core 11 of the rotor assembly 1, slits corresponding to the permanent magnet 12 are provided, including a first slit 1131 and a second slit 1132, which can adjust the magnetic field generated by the permanent magnet 12, improve the magnetic field direction, and reduce the vibration noise and iron loss during the working process of the permanent magnet motor 2. At the same time, by improving the setting method of the slits, the magnetic resistance caused by the slits can also be reduced, the utilization rate of the permanent magnet 12 can be improved, and further the working efficiency and cost performance of the permanent magnet motor 2 can be enhanced.

[0140] Further, during the assembly process, the central shaft hole 111 of the rotor core 11 can be fitted with the rotating shaft of the permanent magnet motor 2, so that the rotor assembly 1 is rotationally connected to the housing of the permanent magnet motor 2, providing support for the rotor assembly 1 and enabling the rotor assembly 1 to rotate relatively stably within the stator assembly 21.

[0141] In addition, the permanent magnet motor 2 in this embodiment also has all the beneficial effects of the rotor assembly 1 in any one of the above embodiments, which will not be elaborated here.

[0142] Embodiment Ten

[0143] In this embodiment, a compressor 3 is provided, as Figure 1 、 Figure 7 and Figure 8 shown. The compressor 3 includes a housing 31, the permanent magnet motor 2 in any one of the above embodiments, and a compression pump assembly 32.

[0144] Both the permanent magnet motor 2 and the compression pump assembly 32 are disposed within the housing 31; the permanent magnet motor 2 serves as a driving component for outputting power to the compression pump assembly 32. Among them, the compression pump assembly 32 is in transmission connection with the rotor assembly 1 of the permanent magnet motor 2, so that when the permanent magnet motor 2 operates, the rotation of the rotor assembly 1 drives the compression pump assembly 32 to operate, realizing the normal operation of the compression pump assembly 32.

[0145] In addition, the compressor 3 in this embodiment also has all the beneficial effects of the permanent magnet motor 2 in any one of the above embodiments, which will not be elaborated here.

[0146] Embodiment Eleven

[0147] In this embodiment, a refrigeration device 4 is provided, as Figure 1 、 Figure 8 and Figure 9 shown. The refrigeration device 4 includes a device body 41 and a refrigeration system 42.

[0148] Part or all of the refrigeration system 42 is disposed within the device body 41 for performing refrigeration operations using the refrigeration system 42. Among them, the refrigeration system 42 includes the compressor 3 in any one of the above embodiments for compressing the refrigerant so that the state of the refrigerant meets the requirements of the refrigeration system 42 and completing the refrigeration cycle in the refrigeration system 42 to realize the refrigeration operation of the refrigeration system 42.

[0149] It should be noted that the refrigeration device 4 can be an air conditioner, a refrigerator, a freezer, or of course other devices for refrigeration operations.

[0150] In addition, the refrigeration device 4 in this embodiment also has all the beneficial effects of the compressor 3 in any one of the above embodiments, which will not be elaborated here.

[0151] A specific embodiment of the present application is provided below:

[0152] A rotor includes a rotor core and a permanent magnet motor having the rotor. The rotor core has a plurality of pairs of V-shaped permanent magnet insertion holes symmetrically distributed around the outer periphery of the shaft hole. A first slit and a second slit are provided between each pair of permanent magnet insertion holes and the outer periphery of the rotor core. The first slit and the second slit are symmetrically arranged with respect to the magnetic pole center, and the second slit is farther from the magnetic pole center than the first slit.

[0153] The first slit and the second slit are close to the outer peripheral side of the rotor core and are equidistant from the outer peripheral side. The shortest distance L1 between the first slit and the permanent magnet insertion hole is less than the shortest distance L2 between the second slit and the permanent magnet insertion hole, and L1 / L2 < 0.44 is satisfied.

[0154] Further, in the above rotor core, there is a certain angle θ between the first slit and the second slit, and 15° ≤ θ ≤ 20°.

[0155] In the above technical solution, specifically, the width w1 of the first slit is set to be greater than the width w2 of the second slit, and 1 mm ≤ w2 < w1 ≤ 1.2 mm.

[0156] In the above technical solution, specifically, the intervals between the first slit and the second slit and the outer peripheral side of the rotor core are set to be greater than twice the thickness of the rotor steel plate.

[0157] In the above technical solution, specifically, the minimum distance d between the first slit and the second slit is set to satisfy 2.5w1 ≤ d ≤ 3w1.

[0158] In the above technical solution, the first slit can be composed of two shorter slits or multiple slits.

[0159] A permanent magnet motor includes the above rotor core.

[0160] Compared with the prior art, due to the technical effects of the above embodiments of the present application, the harmonic content of the permanent magnet motor can be effectively reduced, the motor noise can be reduced, and the cost performance of the motor can be improved.

[0161] The technical solutions of some embodiments according to the present application have been described in detail above in conjunction with the drawings. By improving the arrangement form of the first slit and the second slit, the magnetic resistance generated by the slit can be effectively reduced, the utilization rate of the permanent magnet can be improved, and it is beneficial to improve the operation efficiency and cost performance of the permanent magnet motor assembled with the rotor assembly.

[0162] In an embodiment according to the present application, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance; the term "a plurality" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "coupled" can be a direct connection or an indirect connection through an intermediate medium. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments according to the present application according to specific circumstances.

[0163] In the description of this specification, the description of terms such as "an embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example according to the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0164] The above are only the preferred embodiments according to the present application and are not used to limit the technical solutions of the present application. For those skilled in the art, the technical solutions of the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the technical solutions of the present application shall be included within the protection scope of the present application.

Claims

1. A rotor assembly, characterized in that, comprising: a rotor core provided with a central shaft hole, and a plurality of magnet insertion holes are arranged around the central shaft hole. In a plane perpendicular to the axial direction, the middle of each group of magnet insertion holes extends towards the central shaft hole, and both ends extend away from the central shaft hole; On one side of each group of magnet insertion holes away from the central shaft hole, at least two groups of slits are symmetrically arranged. Each group of slits includes a first slit and a second slit, both extending towards the magnet insertion hole, and the second slit is located on the side of the first slit away from the other group of slits. The first slit corresponds to the middle of the magnet insertion hole, and the second slit corresponds to both ends of the magnet insertion hole; a plurality of permanent magnets, respectively arranged in each group of magnet insertion holes; wherein, the distance between the first slit and the magnet insertion hole is less than the distance between the second slit and the magnet insertion hole; The magnet insertion hole includes two sub-insertion holes arranged symmetrically. In a plane perpendicular to the axial direction, the ends of the two sub-insertion holes close to each other extend towards the central shaft hole, and the ends of the two sub-insertion holes away from each other extend towards the outer peripheral side edge of the rotor core; wherein, one group of slits is correspondingly arranged on one side of each sub-insertion hole away from the central shaft hole. The distances between the first slit and the second slit of each group of slits and the outer peripheral side edge of the rotor core are approximately equal. The ratio of the distance between the first slit and the sub-insertion hole to the distance between the second slit and the sub-insertion hole is less than a first threshold value, and the first threshold value is in the range of 0.4 to 0.

5.

2. The rotor assembly according to claim 1, characterized in that, In each group of slits, the ends of the first slit and the second slit close to the outer peripheral side of the rotor core are close to each other.

3. The rotor assembly according to claim 2, characterized in that, A first included angle is formed between the first slit and the second slit, and the angle range of the first included angle is 15° to 20°.

4. The rotor assembly according to claim 1, characterized in that, In each group of slits, the width of the first slit is greater than the width of the second slit, and the width of the first slit is less than or equal to 1.2 mm, and the width of the second slit is greater than or equal to 1 mm.

5. The rotor assembly according to claim 1, characterized in that, In each group of slits, the minimum distance between the first slit and the second slit is 2.5 to 3 times the width of the first slit.

6. The rotor assembly according to claim 1, characterized in that, The rotor core includes a plurality of core layers arranged in the axial direction. Adjacent two core layers are connected to each other and form a press fit; wherein, the distances between the first slit and the second slit and the outer peripheral side of the rotor core are greater than twice the thickness of the core layer.

7. The rotor assembly according to claim 1, characterized in that, In a plane perpendicular to the axial direction, the first slit includes a plurality of sub-slits arranged at intervals along the length direction, and the interval between two adjacent sub-slits is not less than 0.4 mm.

8. The rotor assembly according to any one of claims 1 to 7, wherein, In a plane perpendicular to the axial direction, there is a gap between the end of each sub-socket and the permanent magnet located in the sub-socket.

9. The rotor assembly according to claim 8, wherein, One end of each sub-socket near the outer peripheral side of the rotor core is provided with a magnetic slot, and the magnetic slot extends along the circumferential direction of the rotor core towards the side close to the corresponding second slit.

10. A permanent magnet motor, wherein, comprising: a stator assembly; The rotor assembly according to any one of claims 1 to 9, coaxially arranged inside the stator assembly.

11. A compressor, wherein, comprising: a housing; The permanent magnet motor according to claim 10, arranged inside the housing; a compression pump assembly, arranged inside the housing and drivingly connected to the rotor assembly of the permanent magnet motor.

12. A refrigeration device, wherein, comprising: a device body, provided with a refrigeration system inside, and the refrigeration system includes the compressor according to claim 11.

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