Rotor assembly, electric machine, compressor and refrigeration appliance

Abstract

The application discloses a rotor assembly, a motor, a compressor and a refrigeration device, and relates to the technical field of motor manufacturing. The rotor assembly comprises a rotor core and a magnet. The rotor core comprises a plurality of magnet grooves which are arranged at intervals in the circumferential direction. At least one circumferential side wall of the magnet groove is provided with a groove in the circumferential direction of the rotor core. An elastic piece is arranged in the groove, and the elastic piece extends beyond the groove. In the radial direction of the rotor core, a gap is arranged between at least one side of the elastic piece and the inner wall of the groove. The magnet is arranged in the magnet groove. The magnet has a recessed part, a part of the elastic piece extends into the recessed part, and the elastic piece is in contact with the magnet at least in the circumferential direction. According to the rotor assembly of the embodiment of the application, the fixing effect of the elastic piece on the magnet can be improved, the stability of the magnet is improved, the structure is simple and easy to construct, the comprehensive utilization rate of the motor can be improved, and the comprehensive cost of the motor can be reduced.

Description

Technical Field

[0001] This application relates to the field of electric motor manufacturing technology, and in particular to a rotor assembly, electric motor, compressor and refrigeration equipment. Background Technology

[0002] Currently, brushless permanent magnet motors are divided into surface-mounted magnet rotors and insert-in magnet rotors. Due to the centrifugal force of the rotor, insert-in magnet rotors are widely used in motors, especially high-speed motors. Since the magnets and magnet slots have a clearance fit, the magnets need to be fixed into the magnet slots to ensure motor performance. The mainstream fixing methods in related technologies are:

[0003] 1. Rotor integral injection molding / potting;

[0004] 2. Apply adhesive between the magnet and the magnet slot;

[0005] 3. Add end plates to both ends of the rotor axially;

[0006] 4. Add expansion material to the magnet groove;

[0007] The above methods require the use of various materials such as glue, plastic, and end plates. Production requires additional processes, resulting in low production efficiency and high production costs. Furthermore, in the long-term environment of refrigerant and lubricant, glue and plastic may experience compatibility issues, affecting product performance and even causing the permanent magnet to fail to fix to the rotor core, leading to malfunctions. Therefore, the related rotor magnet fixing structure is either too expensive or cannot meet the requirements of the compressor. Summary of the Invention

[0008] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a rotor assembly with a recessed portion in the magnet, wherein an elastic element is provided on the rotor core. After the magnet is inserted into the magnet slot, the elastic element can extend into the recessed portion and contact and engage with it, thereby improving the fixing effect of the elastic element on the magnet, enhancing the stability of the magnet, and providing a simple and easy-to-construct structure, which is beneficial for improving the overall utilization rate of the motor and reducing the overall cost of the motor.

[0009] Another objective of the invention is to provide an electric motor, including the aforementioned rotor core.

[0010] Another objective of the invention is to provide a compressor that includes the aforementioned motor.

[0011] Another objective of the invention is to provide a refrigeration device, including the aforementioned motor or compressor.

[0012] According to an embodiment of the present invention, a rotor assembly includes: a rotor core and a magnet. The rotor core includes a plurality of magnet slots spaced apart circumferentially. In the circumferential direction of the rotor core, at least one circumferential sidewall of the magnet slot is provided with a groove. An elastic member is provided in the groove and extends beyond the groove. In the radial direction of the rotor core, at least one side of the elastic member is provided with a notch between it and the inner wall of the groove. The magnet is disposed in the magnet slot and has a recessed portion. A portion of the elastic member extends into the recessed portion, and the elastic member contacts and engages with the magnet at least circumferentially.

[0013] According to the rotor assembly of the present invention, by providing a recess on the magnet and an elastic element on the rotor core, after the magnet is installed in the magnet slot, the elastic element can extend into the recess and contact and cooperate with the recess, which can improve the fixing effect of the elastic element on the magnet, improve the stability of the magnet, and the structure is simple and easy to construct, which is conducive to improving the overall utilization rate of the motor and reducing the overall cost of the motor.

[0014] In addition, the rotor assembly according to the above embodiments of the present invention may also have the following additional technical features:

[0015] In some examples of the present invention, in the circumferential direction of the rotor core, the maximum width of the portion of the magnet having the recess is A, the maximum width of the portion of the magnet not having the recess is B, and the maximum width of the recess is C; in the radial direction of the rotor core, the maximum radial dimension of the magnet is H, the maximum dimension of the elastic element is H1, the maximum width of the groove is H2, the maximum distance from the elastic element to the end of the magnet on the same side is H3, and the rotor assembly is configured to satisfy:

[0016] In some examples of the invention, the rotor assembly is configured to satisfy:

[0017]

[0018] In some examples of the present invention, the elastic element is bent to contact the magnet, and the bending angle of the elastic element is sp, satisfying 10° < sp < 45°.

[0019] In some examples of the present invention, the rotor core includes a plurality of rotor laminations stacked along the axial direction, the number of elastic elements of the rotor laminations is N1, the number of grooves without elastic elements is N2, satisfying N2 = 2 × N1 and N1 = 2 × K, where K is an integer multiple of 1 or 2.

[0020] In some examples of the present invention, the rotor core includes a central ring and a plurality of circumferentially arranged magnetically conductive portions. The radially inner ends of the plurality of magnetically conductive portions are respectively connected to the central ring. Adjacent magnetically conductive portions define a magnet slot. A magnetic isolation zone is provided between the magnet slot and the central ring. The central ring is provided with a support plate, which is disposed within the magnetic isolation zone, extends radially, and contacts the magnet. On the same cross-section of the rotor core, the area of ​​the magnetic isolation zone without the support plate is S1, and the area of ​​the support plate is S2, satisfying the condition... The units for S1 and S2 are mm. 2 .

[0021] According to an embodiment of the present invention, an electric motor includes a stator assembly and a rotor assembly, wherein the rotor assembly is based on the aforementioned rotor assembly and is fitted onto the stator assembly.

[0022] The motor according to an embodiment of the present invention includes the aforementioned rotor assembly. By applying the aforementioned rotor assembly, the stability and reliability of the motor can be improved, and the structure is simple and easy to construct, which is conducive to improving the overall utilization rate of the motor and reducing the overall cost of the motor.

[0023] In some examples of the present invention, the length of the rotor assembly is L1 in the axial direction, the length of the stator assembly is L2, and the length difference between the rotor assembly and the stator assembly is L, satisfying that L1=L2+L, and 5mm≤L≤15mm.

[0024] The compressor according to an embodiment of the present invention includes the aforementioned motor.

[0025] According to the embodiments of the present invention, by applying the aforementioned motor, the compressor can improve its stability and reliability, and its structure is simple and easy to construct, which is conducive to improving the overall utilization rate of the compressor and reducing its overall cost.

[0026] The refrigeration equipment according to embodiments of the present invention includes the aforementioned motor; or includes the aforementioned compressor.

[0027] According to the refrigeration equipment of the present invention, by applying the aforementioned motor or the aforementioned compressor, the stability and reliability of the refrigeration equipment can be improved, and the structure is simple and easy to construct, which is conducive to improving the overall utilization rate of the refrigeration equipment and reducing the overall cost of the refrigeration equipment. Attached Figure Description

[0028] Figure 1 These are schematic diagrams of the motor structure in some embodiments of the present invention (wherein, the magnet is not shown);

[0029] Figure 2 These are schematic diagrams of the rotor assembly in some embodiments of the present invention;

[0030] Figure 3 These are enlarged views of the partial structure of the rotor core in some embodiments of the present invention;

[0031] Figure 4 These are enlarged views of a portion of the rotor assembly in some embodiments of the present invention;

[0032] Figure 5 These are schematic diagrams of the magnet structure in some embodiments of the present invention;

[0033] Figure 6 These are some embodiments of the present invention. The relationship between the value of and the cost of the magnet;

[0034] Figure 7 These are some embodiments of the present invention. The relationship between the value of and the back electromotive force of the motor line;

[0035] Figure 8 These are some embodiments of the present invention. The relationship between the value of and the back electromotive force of the motor line.

[0036] Figure label:

[0037] 1000, Motor; 100, Rotor Assembly; 10, Rotor Lamination; 11, Elastic Component; 101, Groove; 102, Notch; 103, Rivet Hole; 110, Magnet Slot; 12, Magnetic Conducting Part; 121, Outer Magnetic Bridge; 122, First Protrusion; 123, Second Protrusion; 124, Inner Magnetic Bridge; 13, Magnet; 131, Recess; 1311, First Side Wall; 1312, Second Side Wall; 1313, Third Side Wall; 14, Center Ring; 104, Magnetic Isolation Zone; 141, Support Plate; 200, Stator Assembly. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] Combination Figures 1 to 5According to an embodiment of the present invention, a rotor assembly 100 includes a rotor core and a magnet 13. The rotor core includes a plurality of magnet slots 110 spaced apart circumferentially. In the circumferential direction of the rotor core, at least one circumferential sidewall of the magnet slot 110 is provided with a groove 101. An elastic member 11 is provided in the groove 101 and extends beyond the groove 101. In the radial direction of the rotor core, at least one side of the elastic member 11 is provided with a notch 102 between it and the inner wall of the groove 101. The magnet 13 is disposed in the magnet slot 110 and has a recess 131. A portion of the elastic member 11 extends into the recess 131 and the elastic member 11 contacts and engages with the magnet 13 at least circumferentially.

[0040] Specifically, by providing a recess 131 on the magnet 13 after the magnet 13 is installed in the magnet groove 110, the recess 131 can cooperate with the elastic member 11, which can improve the cooperation effect between the elastic member 11 and the magnet 13. The elastic member 11 and the magnet 13 cooperate in the circumferential direction, which can improve the fixing effect of the magnet 13 in the circumferential direction. In addition, a part of the elastic member 11 can extend into the recess 131, which can improve the tightness of the cooperation between the elastic member 11 and the magnet 13. Furthermore, the recess 131 can limit the elastic member 11 in the radial direction, which can improve the cooperation effect between the elastic member 11 and the magnet 13, thereby improving the fixing effect of the magnet 13 in the radial direction. Therefore, by providing a recess 131 on the magnet 13 that is suitable for cooperating with the elastic member 11, the contact tightness between the elastic member 11 and the magnet 13 can be improved, and the fixing effect of the magnet 13 can be improved.

[0041] More specifically, the groove 101 of the magnet slot 110 provides space for the elastic element 11, allowing it to extend a certain distance circumferentially. This increases the size of the elastic element 11 and improves its structural stability. The elastic element 11 extending out of the groove 101 allows it to contact the recessed portion 131 of the magnet 13, improving the fixation effect on the magnet 13. Furthermore, the notch 102 between one or both sides of the elastic element 11 and the inner wall of the groove 101 facilitates the manufacture of the elastic element 11 and provides space for elastic deformation, thus improving its elastic force.

[0042] According to an embodiment of the present invention, the rotor assembly 100 has a recessed portion 131 on the magnet 13 and an elastic element 11 on the rotor core. After the magnet 13 is inserted into the magnet slot 110, the elastic element 11 can extend into the recessed portion 131 and contact and cooperate with the recessed portion 131. This can improve the fixing effect of the elastic element 11 on the magnet 13, improve the stability of the magnet 13, and the structure is simple and easy to construct. This is conducive to improving the overall utilization rate of the motor 1000 and reducing the overall cost of the motor 1000.

[0043] Combination Figure 4In some embodiments of the present invention, in the circumferential direction of the rotor core, the maximum width of the portion of the magnet 13 with the recess 131 is A, the maximum width of the portion of the magnet 13 without the recess 131 is B, and the maximum width of the recess 131 is C; in the radial direction of the rotor core, the maximum radial dimension of the magnet 13 is H, the maximum dimension of the elastic member 11 is H1, the maximum width of the groove 101 is H2, and the maximum distance from the elastic member 11 to the end of the magnet 13 on the same side is H3. The rotor assembly 100 is configured to satisfy:

[0044] Specifically, H1 is the maximum radial dimension of the elastic element 11, and H2 is the maximum width of the radial groove 101. The ratio can define the proportion of the elastic element 11 to the notch 102. In order to improve the cooperation effect between the elastic element 11 and the magnet 13, and to improve the fixing effect of the elastic element 11 on the magnet 13, the ratio can be... The ratio is mapped onto the maximum radial dimension H of magnet 13, i.e. The dimensions of the elastic element 11 can be correlated with the dimensions of the magnet 13, thereby improving the fit between the elastic element 11 and the magnet 13. satisfy,

[0045] Specifically, The ratio of the portion of the magnet 13 without recesses 131 to the portion of the magnet 13 with recesses 131 in the circumferential direction. The ratio of the circumferentially recessed portion 131 to the overall structure of the magnet 13 is given. The value is limited to the ratio between the magnet structure and the recess 131 along the circumferential direction. The dimensions of the recess 131 and the elastic element 11 can be set according to the relationship between the magnet 13, the recess 131 and the elastic piece 11 in the circumferential and radial directions, thereby improving the fit between the elastic element 11 and the magnet 13 and improving the fixing effect of the elastic element 11 on the magnet 13 while ensuring the durability of the elastic element 11.

[0046] In some embodiments of the invention, the rotor assembly 100 is configured to satisfy:

[0047] Specifically, the groove 101 and the elastic element 11 satisfy the following in the radial direction: Specifically, by limiting The ratio can define the proportion of the elastic element 11 to the notch 102, where, if If the ratio is less than 0.6, the radial dimension of the notch 102 is too large, the radial dimension of the elastic sheet 11 is too small, and the strength of the elastic element 11 is low, resulting in poor fixing effect of the elastic element 11 on the magnet 13; if If the ratio is greater than 0.8, the size of the elastic element 11 is too large, the size of the gap 102 between the elastic element 11 and the inner wall of the groove 101 is too small, the elastic deformation space of the elastic element 11 is small, the preload of the elastic element 11 is large, and the difficulty of inserting the magnet 13 into the magnet slot 110 will increase or lead to problems such as fatigue of the elastic element 11. Specifically, in combination with Figure 7 The unit of back electromotive force is V (volt). When the ratio is 0.4, the back electromotive force is 34; When the ratio is 0.5, the back electromotive force is 34.8; When the ratio is 0.6, the back electromotive force is 35.9; When the ratio is 0.7, the back electromotive force is 36.2; When the ratio is 0.8, the back electromotive force is 36.6; When the ratio is 0.9, the back electromotive force is 36.7; When the ratio is 1, the back electromotive force is 36.8. Therefore, it can be seen that the value within... Between, if If the value is less than 0.6, the back EMF of the motor is too low, the utilization rate of magnet 13 is low, and thus the efficiency of the motor is affected. If the value is greater than 0.8, the back electromotive force of the motor tends to be constant, resulting in poor process feasibility.

[0048] Furthermore, The ratio of the portion of the circumferential magnet 13 excluding the recessed portion 131 to the maximum size of the magnet 13. The circumferential dimension of the recess 131 can be defined. If the ratio is greater than 0.95, the circumferential dimension of the recess 131 is large or the depth of the recess is large, which is not conducive to the processing of the recess 131. If the ratio is less than 0.85, the circumferential dimension of the recess 131 is small or the depth of the recess is small, which is not conducive to improving the fit between the recess 131 and the elastic member 11, thereby reducing the fixing effect of the elastic member 11 on the magnet 13. Specifically, in conjunction with Figure 6 The cost of magnet 13 is expressed in RMB (yuan). When the ratio is 0.7, the cost is 0.4; When the ratio is 0.75, the cost is 0.385; When the ratio is 0.8, the cost is 0.38; When the ratio is 0.85, the cost is 0.37; When the ratio is 0.9, the cost is 0.36; When the ratio is 0.95, the cost is 0.37; When the ratio is 1, the cost is 0.385. Therefore, it can be seen that... Values ​​in Between, if If the value is less than 0.85 or greater than 0.95, the production cost of magnet 13 will be greater than 0.37 yuan, while in the range of 0.85 to 0.95, the cost will not exceed 0.37 yuan.

[0049] In the radial direction, H is the distance between the sidewall of the elastic element 11 and the end of the magnet 13, where H is the maximum radial dimension of the magnet 13, defined by... The ratio can define the radial contact position between the elastic element 11 and the magnet 13. A ratio less than 0.3 or greater than 0.7 will cause the contact position between the elastic element 11 and the magnet 13 to deviate radially from the central region of the magnet 13, thereby reducing the fixing effect. Specifically, in combination with Figure 8 The unit of back electromotive force is V (volt). The relationship between the value of the motor line back electromotive force and the value of the motor line back electromotive force is shown in the table below:

[0050]

[0051] From this, we can see that Values ​​in When the value is between 0.3 and 0.7, the back electromotive force of magnet 13 is low, the utilization rate of magnet 13 is low, and the efficiency of motor will be reduced.

[0052] Combination Figure 3 In some embodiments of the present invention, the elastic element 11 is bent to contact the magnet 13, which can improve the contact effect between the elastic element 11 and the magnet 13. After bending, the contact area between the elastic element 11 and the magnet 13 can be increased, thereby further improving the fixing effect between the elastic element 11 and the magnet 13. In addition, after bending, the preload of the elastic element 11 is enhanced, which is beneficial to improving the fastening effect of the elastic element 11 on the magnet 13. Specifically, when the rotor core is not equipped with the magnet 13, the elastic element 11 remains in its initial state or in a horizontally extended state. When the magnet 13 enters the magnet slot 110, the magnet 13 contacts the elastic element 11 and drives the elastic element 11 to bend in the assembly direction of the magnet 13, thereby improving the contact effect between the elastic element 11 and the magnet 13 and realizing the interference fit between the elastic element 11 and the magnet 13.

[0053] Furthermore, the bending angle of the elastic element 11 is sp, satisfying 10° < sp < 45°. Specifically, if the bending angle of the elastic element 11 is less than 10°, the structural strength of the elastic element 11 is high, but the cooperation effect with the magnet 13 is poor, resulting in a poor fixing effect on the magnet 13; if the bending angle of the elastic element 11 is greater than 45°, the cooperation effect between the elastic element 11 and the magnet 13 is good, but the structural strength of the elastic element 11 is poor, that is, when the interference between the elastic element 11 and the magnet 13 is large, the bending angle of the elastic element 11 is also larger. Therefore, by controlling the bending angle sp of the elastic element 11 within a reasonable range, the elastic element 11 can achieve a balance between structural stability and preload. More specifically, the bending effect of the elastic element 11 can be controlled by controlling the length of the elastic element 11 extending out of the groove 101.

[0054] Combination Figure 3 In some embodiments of the present invention, the rotor core includes a plurality of rotor laminations 10 stacked axially. The number of elastic elements 11 of the rotor laminations 10 is N1, and the number of grooves 101 without elastic elements 11 is N2, satisfying N2 = 2 × N1 and N1 = 2 × K, where K is an integer multiple of 1 or 2. That is, the number of grooves 101 without elastic elements 11, N2, is twice the number of elastic elements 11. Thus, when the plurality of rotor laminations 10 are stacked axially, the grooves 101 without elastic elements 11 can be used to avoid the grooves 101 with elastic elements 11, so that the elastic elements 11 can bend into the grooves 101 without elastic elements 11, thereby achieving an avoidance effect. Specifically, in a plurality of rotor laminations 10, the next rotor lamination 10 is stacked relative to the previous rotor lamination 10 by rotating a preset angle around the axis of the rotor core. In this way, when a plurality of rotor laminations 10 with identical structural shapes are stacked, although the distribution of elastic elements 11 on each rotor lamination 10 is the same as that on the other rotor laminations 10, the relative position of the elastic elements 11 between the rotor laminations 10 can be changed by rotating the preset angle, so that the elastic elements 11 in the grooves 101 of a portion of the rotor laminations 10 are axially opposite to the grooves 101 of a portion of the rotor laminations 10.

[0055] For example, there are at least two elastic elements 11N1 and at least four grooves 101N2.

[0056] Combination Figure 2In some embodiments of the present invention, the rotor core includes a central ring 14 and a plurality of circumferentially arranged magnetically conductive portions 12. The radially inner ends of the plurality of magnetically conductive portions 12 are respectively connected to the central ring 14, and a magnet slot 110 is defined between adjacent magnetically conductive portions 12. More specifically, a magnetic isolation region 104 is provided between the magnet slot 110 and the central ring 14. The central ring 14 is provided with a support plate 141, which is disposed in the magnetic isolation region 104 and extends radially and contacts the magnet 13. The magnetic isolation region 104 is beneficial to improving the utilization rate of the magnetic field, which is beneficial to the performance and efficiency of the motor 1000. Therefore, by reasonably setting the area of ​​the support plate 141, it is possible to avoid the support plate 141 occupying an excessively large magnetic isolation region 101.

[0057] Furthermore, on the same cross-section of the rotor core, the area of ​​the magnetic isolation zone 104 without support plate 141 is S1, and the area of ​​the support plate 141 is S2, which satisfies... The units for S1 and S2 are mm. 2 . Specifically, The ratio of the area of ​​the support plate 141 to the area of ​​the magnetic isolation zone 104 is crucial. A ratio greater than 6 results in the support plate 141 occupying too small an area, leading to poor support of the magnet 13 and increased susceptibility to deformation. Conversely, a ratio less than 2 results in the support plate 141 occupying too large an area, causing magnetic leakage in the magnet 13, reducing the back EMF, and lowering motor efficiency. Therefore, proper control is essential. The ratio can be used to balance the support effect of the support plate 141 and the efficiency of the motor 1000, thereby improving the overall performance of the motor 1000.

[0058] In some embodiments of the present invention, adjacent magnetic conductive portions 12 have external magnetic bridges 121 on their sidewalls facing each other, and the external magnetic bridges 121 are located radially outward of the magnet 13. Specifically, the magnet groove 110 has two circumferentially opposite external magnetic bridges 121, which can provide a radial limiting effect on the magnet 13. The support plate 141 can support the magnet 13 radially, improving the stability of the magnet 13. That is, on the radially opposite sides of the magnet 13, a support plate 141 is provided on the side closer to the central ring 14 to support the magnet 13, and an external magnetic bridge 121 extending circumferentially is provided on the outer periphery away from the central ring 14 or the rotor core. In conjunction with the foregoing, the elastic member 11 can contact or abut against the magnet 13 circumferentially, thereby the rotor core can fix the magnet 13 circumferentially and radially, improving the stability and reliability of the magnet 13 after installation.

[0059] More specifically, the support plate 141 and the central ring 14 are integrated into one piece, which facilitates manufacturing, improves structural stability, and facilitates assembly.

[0060] In some embodiments of the present invention, the support plate 141 and the magnet 13 can be fitted with a radial clearance. When the motor 1000 is actually running, the magnet 13 may come into contact with the support plate 141 so that the support plate 141 can play the role of supporting the magnet 13.

[0061] In other embodiments of the present invention, the support plate 141 and the magnet 13 can be radially contacted and fitted, which can improve the supporting effect of the support plate 141 on the magnet 13. In practical applications, the support plate 141 plays a supporting role but will not deform.

[0062] In some other embodiments of the present invention, the support plate 141 and the magnet 13 may be radially interference-fitted. For example, after the magnet 13 is installed, the support plate 141 is bent to contact the magnet 13, thereby improving the fixing effect on the magnet 13.

[0063] Combination Figure 2 In some embodiments of the present invention, the magnets 13 are symmetrically distributed in the circumferential direction of the rotor core, and the number of them is Y, where Y is an integer multiple of 2. This can improve the stability and consistency of the rotor assembly 100, and the stacked distribution of the magnets 13 is beneficial to reducing noise.

[0064] In some embodiments of the present invention, the rotor lamination 10 rotates once every (360° / p) angles, where (360° / p) is the rotation angle when the rotor laminations 10 are stacked, and p is the number of pole pairs. The rotor lamination 10 is embedded with a magnet 13.

[0065] Combination Figure 2 In some specific embodiments of this application, the magnetic conductive part 12 is provided with rivet holes 103, which are stacked together in the axial direction by rivets, which can facilitate the assembly of the rotor core and improve the structural stability of the rotor core.

[0066] Furthermore, in some embodiments, the protrusions on each magnetic conductive part 12 include a first protrusion 122 and a second protrusion 123 arranged radially spaced apart, one of the first protrusion 122 and the second protrusion 123 being configured to extend radially and the other being configured to extend circumferentially, so as to improve the connection stability between two axially adjacent magnetic conductive parts 12.

[0067] In some embodiments of the present invention, the rotor core further includes an inner magnetic bridge 124, which is disposed between each magnetic conductive part 12 and the central ring 14 to achieve limiting and connection between the magnetic conductive part 12 and the central ring 14.

[0068] Combination Figure 5In some embodiments of the present invention, the recess 131 includes a first sidewall 1311 extending radially. The two ends of the first sidewall 1311 are respectively connected to one end of a second sidewall 1312 and a third sidewall 1313 that are radially opposite. The other ends of the second sidewall 1312 and the third sidewall 1313 are connected to the side of the magnet 13. A chamfer is formed between the second sidewall 1312 and the side of the magnet 13, and a chamfer is formed between the third sidewall 1313 and the side of the magnet 13. This facilitates manufacturing and assembly and avoids damage.

[0069] In some embodiments of the present invention, the recess 131 is configured as an opening groove recessed inward along the circumferential magnet 13. The opening groove facilitates the insertion of the elastic member 11 into the recess 131. The recess 131 has a chamfer at the opening. In this way, when the elastic member 11 is engaged with the recess 131, the elastic member 11 can easily enter the recess 131 and is not easily damaged.

[0070] In some embodiments of the present invention, the end of the elastic member 11 facing the recess 131 is provided with a chamfer, which can facilitate manufacturing and assembly and can prevent damage to the magnet 13 when the elastic member 11 is engaged with the magnet 13.

[0071] In some embodiments of the present invention, the recess 131 and the elastic member 11 are radially clearance-fitted, which facilitates assembly, reduces manufacturing precision, and thus reduces manufacturing costs.

[0072] According to an embodiment of the present invention, the motor 1000 includes: a stator assembly 200 and a rotor assembly 100, wherein the rotor assembly 100 is the rotor assembly 100 described above, and the rotor assembly 100 is fitted onto the stator assembly 200.

[0073] According to the embodiments of the present invention, by applying the aforementioned rotor assembly 1000, the stability and reliability of the motor 1000 can be improved, and the structure is simple and easy to construct, which is conducive to improving the overall utilization rate of the motor 1000 and reducing the overall cost of the motor 1000.

[0074] In some embodiments of the present invention, the length of the rotor assembly 100 is L1 in the axial direction, the length of the stator assembly 200 is L2, and the length difference between the rotor assembly 100 and the stator assembly 200 is L, satisfying L1 = L2 + L. That is, in the axial direction, the length of the rotor assembly 100 is different from the length of the stator assembly 200; the length of the rotor assembly 100 is greater than the length of the stator assembly 200. The axial length of the rotor assembly 100 is longer than that of the stator assembly 200, resulting in a larger starting speed and moment of inertia of the motor 1000.

[0075] In practical applications, it is necessary to balance rotational inertia and starting performance according to specific requirements to achieve optimal system performance. Therefore, the axial length difference L between the rotor assembly 100 and the stator assembly 200 can be configured to satisfy 5mm≤L≤15mm. Specifically, L can be 6mm, 8mm, or 10mm, etc., and can be appropriately adjusted according to the actual size of the motor. The present invention is not limited thereto.

[0076] The compressor according to an embodiment of the present invention includes the aforementioned motor 1000. By applying the aforementioned motor 1000, the stability and reliability of the compressor can be improved, and the structure is simple and easy to construct, which is conducive to improving the overall utilization rate of the compressor and reducing the overall cost of the compressor.

[0077] The refrigeration equipment according to the embodiments of the present invention includes the aforementioned motor 1000; or includes the aforementioned compressor. By applying the aforementioned motor 1000 or the aforementioned compressor, the stability and reliability of the refrigeration equipment can be improved, and the structure is simple and easy to construct, which is conducive to improving the overall utilization rate of the refrigeration equipment and reducing the overall cost of the refrigeration equipment.

[0078] The rotor assembly 100 and the motor 1000 of a specific embodiment of the present invention are described below with reference to the accompanying drawings.

[0079] This invention proposes a rotor assembly 100 for a reciprocating refrigerator compressor motor 1000. The rotor core has rotor magnet slots 110, and at least one circumferential sidewall of each slot 110 has a groove 101. The rotor core has one or more pairs of protruding elastic elements 11 at some of the magnet slots 110, with the elastic elements 11 located within the grooves 101. Other magnet slots 110 have clearance grooves 101 at their respective locations, and clearance magnets 13 are located at positions corresponding to the elastic elements 11. The rotor core includes multiple rotor laminations 10 stacked axially. During the stacking process of the rotor laminations 10, each layer of rotor laminations 10 rotates by a specific angle. The magnet slots 110 and magnets 13 are in a clearance fit. When a magnet 13 is inserted into a magnet slot 110, it is fixed to the magnet 13 by the protruding elastic elements 11 within the magnet slot 110. Through the design of paired elastic elements 11 in each layer of the rotor and grooves 101 in the magnet 13, the elastic elements 11 have sufficient bending space. In a wide range of clearance fits, this provides sufficient elastic force to fix the magnet 13 to the iron core while preventing plastic deformation and loss of resilience. The stator and rotor iron core, elastic elements 11, and magnet 13 structure described in this invention limit the wobbling of the magnet 13 and reduce the overall cost of the motor 1000.

[0080] Specifically, the rotor assembly 100 according to an embodiment of the present invention includes a rotor core and a magnet 13. The magnet 13 inserted into the magnet slot 110 can be fixed by the structure of the elastic element 11 and the recess 131 provided in the magnet 13. This can ensure the clearance fit between the magnet 13 and the magnet slot 110, provide sufficient fixing strength for the magnet 13, prevent the magnet 13 from breaking, and enable simple assembly.

[0081] Furthermore, multiple magnet slots 110 are uniformly arranged along the circumferential direction in the rotor lamination 10, and are arranged and stacked along the axial direction. The rotor core is a silicon steel core, and an elastic element 11 is provided in a specific magnet slot 110. The elastic element 11 is higher than the edge of the magnet slot 110. When the magnet 13 is inserted into the magnet slot 110 from the axial direction, it squeezes the elastic element 11, causing the elastic element 11 to deform. The deformation elastic force of the elastic element 11 is used to fix the magnet 13 in the magnet slot 110. In the two sets of magnet slots 110 that are not adjacent to the elastic element 11 in the direction of rotor core rotation, a groove 101 is provided at the same position as the elastic element 11 after rotation. The width of the groove 101 is not less than that of the elastic element 11, ensuring that there is no interference between the elastic element 11 and the adjacent rotor lamination 10 when the elastic element 11 deforms.

[0082] Preferably, the rotor lamination 10 rotates by the angle of one magnetic pole during each stacking, aligning the edges of the magnetic poles, and aligning the elastic element 11 with the grooves 101 of the upper and lower adjacent layers.

[0083] The present invention also protects a compressor, which is a DC inverter compressor, wherein the rotor core adopts an elastic element 11 to fix the magnet 13, which enhances the stability of the magnet 13, improves the overall utilization rate of the motor 1000, and reduces the overall cost of the product.

[0084] In the description of this invention, it should be understood that the terms "center", "lateral", "length", "width", "upper", "lower", "horizontal", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotor assembly (100), characterized in that, include: The rotor core includes a plurality of circumferentially spaced magnetic slots (110). In the circumferential direction of the rotor core, at least one circumferential sidewall of the magnetic slot (110) is provided with a groove (101). An elastic element (11) is provided in the groove (101) and the elastic element (11) extends beyond the groove (101). In the radial direction of the rotor core, at least one side of the elastic member (11) is provided with a notch (102) between it and the inner wall of the groove (101); A magnet (13) is disposed in the magnet groove (110), the magnet (13) has a recess (131), a portion of the elastic member (11) extends into the recess (131), and the elastic member (11) contacts and engages with the magnet (13) at least circumferentially.

2. The rotor assembly (100) according to claim 1, characterized in that, In the circumferential direction of the rotor core, the maximum width of the portion of the magnet (13) with the recess (131) is A, the maximum width of the portion of the magnet (13) without the recess (131) is B, and the maximum width of the recess (131) is C. In the radial direction of the rotor core, the maximum radial dimension of the magnet (13) is H, the maximum dimension of the elastic element (11) is H1, the maximum width of the groove (101) is H2, the maximum distance from the elastic element (11) to the end of the magnet (13) on the same side is H3, and the rotor assembly (100) is configured to satisfy:

3. The rotor assembly (100) according to claim 2, characterized in that, The rotor assembly (100) is configured to satisfy:

4. The rotor assembly (100) according to claim 1, characterized in that, The elastic element (11) bends to contact the magnet (13), and the bending angle of the elastic element (11) is sp, which satisfies 10° < sp < 45°.

5. The rotor assembly (100) according to claim 1, characterized in that, The rotor core includes a plurality of rotor laminations (10) stacked along the axial direction. The number of elastic elements (11) of the rotor laminations (10) is N1, and the number of grooves (101) without elastic elements (11) is N2, satisfying N2 = 2 × N1 and N1 = 2 × K, where K is an integer multiple of 1 or 2.

6. The rotor assembly (100) according to claim 1, characterized in that, The rotor core includes a central ring (14) and a plurality of circumferentially arranged magnetic conductive parts (12). The radial inner ends of the plurality of magnetic conductive parts (12) are respectively connected to the central ring (14). The magnetic conductive parts (12) define the magnet slot (110) between adjacent magnetic conductive parts (12). A magnetic isolation zone (104) is provided between the magnet slot (110) and the central ring (14). The central ring (14) is provided with a support plate (141). The support plate (141) is located in the magnetic isolation zone (104) and extends radially and contacts the magnet (13). On the same cross-section of the rotor core, the area of ​​the magnetic isolation zone (104) without the support plate (141) is S1, and the area of ​​the support plate (141) is S2, which satisfies the condition. The units for S1 and S2 are mm. 2 .

7. An electric motor (1000), characterized in that, include: Stator assembly (200), A rotor assembly (100), the rotor assembly (100) being the rotor assembly (100) according to any one of claims 1-6, the rotor assembly (100) being fitted onto the stator assembly (200).

8. The motor (1000) according to claim 7, characterized in that, In the axial direction, the length of the rotor assembly (100) is L1, the length of the stator assembly (200) is L2, and the length difference between the rotor assembly (100) and the stator assembly (200) is L, satisfying that L1=L2+L, and 5mm≤L≤15mm.

9. A compressor, characterized in that, Includes the motor (1000) as described in claim 7 or 8.

10. A refrigeration device, characterized in that, It includes the motor (1000) as described in claim 7 or 8; or it includes the compressor as described in claim 9.

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