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, a magnet and an elastic piece. The rotor core comprises a center ring and a plurality of circumferentially arranged magnetic conducting parts. The radially inner ends of the plurality of magnetic conducting parts are connected with the center ring respectively. The magnet slots and the center ring are provided with a magnetic separation area. The magnet is arranged in the magnet slot. The radially inner end surface of the magnet is provided with a matching part which is recessed inward along the radial direction. The elastic piece is arranged in the magnetic separation area and is opposite to the matching part along the radial direction. The elastic piece extends into the matching part and at least contacts and matches with the radial side wall of the matching part. According to the rotor assembly of the embodiment of the application, the matching part arranged on the magnet and matched with the elastic piece can improve the matching effect of the elastic piece and the magnet, improve the stability of the magnet, and is simple in structure and easy to construct. It is beneficial to improve the comprehensive utilization rate of the motor and reduce the comprehensive cost of the motor.

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 mating part for the magnet. The rotor assembly is equipped with an elastic element, which can improve the contact tightness between the elastic element and the magnet, improve the fixing effect of the magnet, enhance the stability of the magnet, and has a simple and easy-to-construct structure, thus 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, a magnet, and an elastic element. 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. A magnet slot is defined between adjacent magnetically conductive portions. A magnetic isolation region is provided between the magnet slot and the central ring. The magnet is disposed in the magnet slot, and the radially inner end face of the magnet is provided with a radially inwardly recessed mating portion. The elastic element is disposed in the magnetic isolation region and is radially opposite to the mating portion. The elastic element extends into the mating portion and contacts and engages with at least the radial sidewall of the mating portion.

[0013] According to the rotor assembly of the present invention, by providing a mating part on the magnet suitable for cooperating with the elastic element, the contact tightness between the elastic element and the magnet can be improved, the fixing effect on the magnet can be improved, the stability of the magnet 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.

[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, the radial sidewall of the mating part is formed as a first arcuate mating surface, and the elastic element contacts the first arcuate mating surface.

[0016] In some examples of the present invention, the end of the elastic element is provided with a second arc-shaped mating surface, which contacts the first arc-shaped mating surface.

[0017] In some examples of the present invention, the arc length of the first arc-shaped mating surface is L1, the arc length of the second arc-shaped mating surface is L2, and L2 < L1.

[0018] In some examples of the present invention, the central angle of the second arcuate mating surface is larger than the central angle of the first arcuate mating surface.

[0019] In some examples of the present invention, the elastic element includes a first portion and a second portion, the first portion being connected to the central ring, and the second portion contacting the magnet; in the circumferential direction of the rotor core, the maximum width of the second portion is W1, the maximum width of the first portion is W2, the maximum width of the magnet is W, and the maximum straight-line distance between the middle portions of the opposite sidewalls of the magnetic isolation zone is W3; in the radial direction of the rotor core, the maximum dimension of the magnet is H, the shortest distance between the mating portion and the radial end face of the magnet is H1, the maximum dimension of the second portion is H2, and the maximum dimension of the first portion is H3, and satisfies... and

[0020] In some examples of the present invention, the magnetically conductive part is connected to the central ring via an inner magnetic bridge, the maximum circumferential dimension of which is W4, and

[0021] In some examples of the present invention, on the same cross-section of the rotor core, the area of ​​the magnetic isolation zone without the elastic element is S1, and the area of ​​the elastic element is S2, satisfying the condition that... The units for S1 and S2 are mm. 2 .

[0022] In some examples of the present invention, the rotor core includes a plurality of rotor laminations stacked axially. When the plurality of rotor laminations are stacked axially, the elastic element can be bent to contact the mating part. The bending angle of the elastic element is sp, which satisfies 10° < sp < 45°.

[0023] According to an embodiment of the present invention, an electric motor includes a stator assembly and a rotor assembly, wherein the rotor assembly is the aforementioned rotor assembly.

[0024] 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.

[0025] In some examples of the present invention, the length of the rotor assembly is L3 in the axial direction, the length of the stator assembly is L4, and the length difference between the rotor assembly and the stator assembly is L, satisfying that L3=L4+L, and 5mm≤L≤15mm.

[0026] The compressor according to an embodiment of the present invention includes the aforementioned motor.

[0027] 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.

[0028] The refrigeration equipment according to embodiments of the present invention includes the aforementioned motor; or includes the aforementioned compressor.

[0029] 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

[0030] Figure 1 These are schematic diagrams of the rotor assembly in some embodiments of the present invention;

[0031] Figure 2 These are enlarged views of a portion of the rotor core structure in some embodiments of the present invention;

[0032] Figure 3 These are enlarged views of a portion of the rotor assembly in some embodiments of the present invention;

[0033] Figure 4 These are schematic diagrams of the magnet structure in some embodiments of the present invention;

[0034] Figure 5 These are some embodiments of the present invention. The relationship between the value of and the bending deformation stress value of the elastic component;

[0035] Figure 6 These are some embodiments of the present invention. The relationship between the value of and the bending deformation stress value of the elastic component;

[0036] 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.

[0037] Figure label:

[0038] 1000, Rotor assembly; 100, Rotor core; 10, Rotor lamination; 11, Elastic element; 11a, First part; 11b, Second part; 112, Second arc-shaped mating surface; 101, Magnetic isolation zone; 103, Rivet hole; 110, Magnet slot; 12, Magnetic conductive part; 121, Outer magnetic bridge; 122, First protrusion; 123, Second protrusion; 124, Inner magnetic bridge; 13, Magnet; 131, Mating part; 1311, First arc-shaped mating surface; 14, Center ring. Detailed Implementation

[0039] 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.

[0040] Combination Figures 1 to 4 According to an embodiment of the present invention, a rotor assembly 1000 includes a rotor core 100, a magnet 13, and an elastic element 11. The rotor core 100 includes a central ring 14 and a plurality of magnetically conductive portions 12 arranged circumferentially. The radial inner ends of the plurality of magnetically conductive portions 12 are respectively connected to the central ring 14. A magnet slot 110 is defined between adjacent magnetically conductive portions 12. A magnetic isolation zone 101 is provided between the magnet slot 110 and the central ring 14. The magnetic isolation zone 101 can balance the transmission and leakage of magnetic flux, which is beneficial to improving the utilization rate of the magnet 13.

[0041] Specifically, the magnet 13 is disposed within the magnet groove 110, and the radially inner end face of the magnet 13 has a radially recessed mating portion 131; the elastic element 11 is disposed in the magnetic isolation zone 101 and is radially opposite to the mating portion 131. Thus, the magnetic isolation zone 101 provides space for the arrangement of the elastic element 11, simplifying the structure, and the placement of the elastic element 11 within the magnetic isolation zone 101 facilitates direct contact and engagement between the elastic element 11 and the magnet 13, improving the structural compactness. More specifically, the elastic element 11 extends into the mating portion 131 and at least contacts and engages with the radial sidewall of the mating portion 131, improving the tightness of the engagement between the elastic element 11 and the magnet 13, enhancing the mating effect between the elastic element 11 and the magnet 13, thereby improving the radial fixation effect of the magnet 13, increasing the contact area between the elastic element 11 and the mating portion 131, and thus improving structural stability. The radial engagement between the elastic element 11 and the magnet 13 improves the fixation effect of the elastic element 11 on the magnet 13.

[0042] According to the embodiment of the present invention, the rotor assembly 1000, by providing a mating part 131 on the magnet 13 that is suitable for cooperating with the elastic member 11, can improve the contact tightness between the elastic member 11 and the magnet 13, improve the fixing effect of the magnet 13, improve the stability of the magnet 13, and has a simple structure that is easy to construct, which is conducive to improving the overall utilization rate of the motor and reducing the overall cost of the motor.

[0043] Furthermore, combined Figure 4 In some embodiments of the present invention, the radial sidewall of the mating portion 131 is formed as a first arc-shaped mating surface 1311. The elastic member 11 contacts the first arc-shaped mating surface 1311, which can improve the stress distribution of the elastic member 11 and help improve the structural stability and durability of the magnet 13 after assembly. In addition, the first arc-shaped mating surface 1311 of the mating portion 131 helps the elastic member 11 to better perform its elastic function, adapt to deformation, and provide stable elastic force.

[0044] Furthermore, combining Figure 3 In some embodiments of the present invention, the end of the elastic member 11 is provided with a second arc-shaped mating surface 112, which contacts the first arc-shaped mating surface 1311. This can better disperse contact stress and help extend the service life of the elastic member 11. In addition, both the elastic member 11 and the mating part 131 are in contact and mated through arc-shaped mating surfaces, which can improve the mating effect when they are in contact, especially when there are deviations during assembly, they can still maintain good contact.

[0045] Combination Figure 3In some embodiments of the present invention, the arc length of the first arc-shaped mating surface 1311 is L1, the arc length of the second arc-shaped mating surface 112 is L2, and L2 < L1, that is, the arc length of the first arc-shaped mating surface 1311 is greater than the arc length of the second arc-shaped mating surface 112. Thus, when the magnet 13 mates with the elastic member 11, the elastic member 11 can more easily contact the first arc-shaped surface of the mating part 131. For example, when the magnet 13 is misaligned during assembly, the arc-shaped surface of the mating part 131 can still contact the elastic member 11, and the second arc-shaped mating of the elastic member 11 can move appropriately along with the arc surface of the first arc-shaped mating surface 1311, thereby achieving a more suitable assembly position. This reduces assembly difficulty and manufacturing precision, and improves assembly effect.

[0046] In some embodiments of the present invention, the central angle of the second arc-shaped mating surface 112 is greater than the central angle of the first arc-shaped mating surface 1311. That is, the arc curvature of the second arc-shaped mating surface 112 is greater and the curve is more curved, while the curve of the first arc-shaped mating surface 1311 intersects the second mating surface at a relatively gentle arc angle, thus constructing a smoother arc surface. As a result, the elastic element 11 has a greater range of motion when mating with the magnet 13, exhibiting strong adaptability and facilitating assembly.

[0047] Combination Figure 2 and Figure 3 In some embodiments of the present invention, the elastic element 11 includes a first portion 11a and a second portion 11b. The first portion 11a is connected to the central ring 14, which can improve the stability of the elastic element 11. The second portion 11b is in contact with the magnet 13, which can improve the stability of the magnet 13 after assembly. In addition, in the circumferential direction of the central ring 14, the circumferential dimension of the first portion 11a is larger than that of the second portion 11b. That is, the circumferential dimension of the first portion 11a connected to the central ring 14 in the elastic element 11 is larger, which can improve the supporting force and structural stability of the elastic element 11. The circumferential dimension of the second portion 11b in contact with the magnet 13 is smaller, which can facilitate the assembly of the magnet 13 and can provide a suitable preload force for the magnet 13.

[0048] Specifically, in the circumferential direction of the rotor core 100, the maximum width of the second part 11b is W1, the maximum width of the first part 11a is W2, the maximum width of the magnet 13 is W, and the maximum straight-line distance between the middle parts of the opposite sidewalls of the magnetic isolation zone 101 is W3; in the radial direction of the rotor core 100, the maximum dimension of the magnet 13 is H, the shortest distance between the mating part 131 and the radial end face of the magnet 13 is H1, the maximum dimension of the second part 11b is H2, the maximum dimension of the first part 11a is H3, and satisfies... and

[0049] Specifically, The ratio of the size of the second part 11b to the size of the first part 11a is the ratio of the size of the first part 11a connected to the central ring 14 in the elastic member 11 to the size of the second part 11b in the elastic member 11 that contacts the magnet 13. This ratio satisfies the following condition: like If the ratio is greater than 0.7, then the size of the first part 11a is larger, which can improve the stability of the elastic element 11, but the pressing of the magnet 13 is more difficult. If the ratio is less than 0.5, the size of the second part 11b is larger, which can improve the contact effect or contact area with the magnet 13. However, the size of the first part 11a is smaller, resulting in lower overall structural strength of the elastic element 11. This represents the ratio or proportional relationship between the first part 11a and the second part 11b in the radial direction. If... If the value is less than 0.7, the size of the first part 11a is too large, the size of the second part 11b is too small, and the preload of the elastic element 11 is too large, which is not conducive to assembly and improving the durability of the elastic element 11. Specifically, in combination with Figure 5 The unit of the bending deformation stress value of elastic element 11 is N (Newton). The ratio and the bending deformation stress value of elastic element 11 are shown in the table below:

[0050]

[0051]

[0052] thus, Values between; When the value is less than 0.5, the bending deformation stress value of the elastic element 11 of the rotor lamination 10 of the motor is small, resulting in poor fixing effect; and the bending deformation stress value of the elastic element 11 is similar to that of the motor. This is equivalent to a value of 0.7. Furthermore, If the value is too small, the stamping process of elastic component 11 will be poor. When the value is greater than 0.7, the bending deformation stress value of the elastic element 11 of the rotor lamination 10 of the motor becomes much larger, making it difficult for the magnet 13 to be pressed into the rotor core 100.

[0053] like If the value is greater than 0.9, then the size of the first part 11a is smaller and the size of the second part 11b is larger. The first part 11a is connected to the central ring 14 and can support the elastic element 11. Therefore, the smaller size of this part may lead to lower structural strength of the elastic element 11, which is not conducive to improving the overall structural stability and the fixing effect of the elastic element 11 on the magnet 13. Specifically, in combination with Figure 6 The unit of the bending deformation stress value of elastic element 11 is N (Newton). The ratio and the bending deformation stress value of elastic element 11 are shown in the table below:

[0054]

[0055] thus, Values between; When the value is less than 0.7, the bending deformation stress value of the elastic element 11 of the rotor lamination 10 becomes much larger, making it difficult for the magnet 13 to be pressed into the rotor core 100. When the value is greater than 0.9, the bending deformation stress value of the elastic element 11 of the rotor lamination 10 and The value is equivalent to 0.9, and when When the value is too large, the stamping process of the rotor elastic element 11 is poor, which has a significant impact on the tool life of the mold.

[0056] Furthermore, and Multiplying each by the size W3 of the magnetic isolation region 101, we can obtain... and This can demonstrate the proportion of the radial and circumferential dimensions of the elastic element 11 within the magnetic shielding zone 101.

[0057] The ratio of the radial dimension of magnet 13 excluding the mating portion 131 to the maximum size of magnet 13 reflects the radial proportional relationship between the mating portion 131 and magnet 13. That is to The ratio is mapped onto the maximum axial dimension W of magnet 13. satisfy, Will The value is limited to and The dimensions of the mating part 131 can be set according to the radial and circumferential proportions of the elastic element 11 within the magnetic isolation zone 101, thereby improving the mating effect between the elastic element 11 and the magnet 13 and enhancing the fixing effect of the elastic element 11 on the magnet 13 while ensuring the durability of the elastic element 11.

[0058] Optionally, W3 can be the maximum straight-line distance between the middle parts of the opposite sidewalls of the magnetic isolation zone 101, or the maximum or minimum straight-line distance of the magnetic isolation zone 101 in the circumferential direction of the rotor core 100, which can be selected according to the actual situation.

[0059] Combination Figure 1 and Figure 3In some embodiments of the present invention, the rotor core 100 further includes an inner magnetic bridge 124, which is disposed between each magnetic conductive part 12 and the central ring 14. The magnetic conductive part 12 is connected to the central ring 14 through the inner magnetic bridge 124 to realize the limiting and connection between the magnetic conductive part 12 and the central ring 14.

[0060] Furthermore, combined Figure 3 The maximum circumferential dimension of the inner magnetic bridge 124 is W4, and W3 is the ratio of the maximum straight-line distance between the middle of the opposite sidewalls of the magnetic isolation zone 101 to the maximum circumferential dimension of the inner magnetic bridge 124. Since the dimension W3 of the inner magnetic bridge 124 changes little, the radial position of the magnet 13 in the magnet slot 110 can be changed by adjusting the dimension of W3. Specifically, when W4 is almost constant or changes little, when W3 is large, the circumferential dimension of the magnetic isolation zone 101 is large, the circumferential dimension of the magnet slot 110 will be large, and the radial dimension will be small. This causes the magnet 13 to be closer to the stator after being installed in the magnet slot 110, and the size of the magnet 13 will be smaller. This can reduce the manufacturing cost of the motor, but it will also reduce the efficiency of the motor. When W3 is large, the circumferential dimension of the magnetic isolation zone 101 is smaller, the circumferential dimension of the magnet slot 110 becomes smaller, and the radial dimension becomes larger. This causes the magnet 13, after being installed in the magnet slot 110, to be closer to the rotor shaft, which is beneficial to improving the efficiency of the motor. However, since this arrangement requires more magnets 13, it increases the manufacturing cost. Therefore, in order to balance the overall cost and overall utilization rate of the motor, The ratio is limited to between 5 and 8. If the ratio is less than 5, the cost of the motor will increase; if the ratio is greater than 8, the efficiency of the motor will decrease.

[0061] Specifically, in combination Figure 7 The unit of back electromotive force is V (volt). The relationship between the value of the motor back electromotive force and the value of the motor back electromotive force is shown in the table below:

[0062]

[0063]

[0064] Values between; A value less than 5 will cause magnet 13 to move towards the inner hole of the rotor, and the back EMF value will tend to stabilize. A value that is too small... Choosing the wrong value will increase the cost of the motor rotor. A value greater than 8 will cause the back EMF of magnet 13 to decrease at a faster rate, resulting in low utilization of magnet 13 and reduced motor efficiency.

[0065] Combination Figure 1 In some embodiments of the present invention, adjacent magnetic conductive portions 12 have external magnetic bridges 121 on their sidewalls facing each other. The external magnetic bridges 121 are located radially outside the magnet and radially outside the magnet 13. An elastic member 11 is connected to the central ring 14 and extends radially to contact 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 elastic member 11 can fix the magnet 13 radially, improving the stability of the magnet 13. That is, on the radially opposite sides of the magnet 13, an elastic member 11 is provided on the side closer to the central ring 14 to fix 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 100.

[0066] More specifically, the elastic element 11 and the central ring 14 are integrated into one piece, which facilitates manufacturing, improves structural stability, and facilitates assembly.

[0067] On the same cross-section of the rotor core 100, the area of ​​the magnetic isolation region 101 without the elastic element 11 is S1, and the area of ​​the elastic element 11 is S2, which satisfies... The units for S1 and S2 are mm. 2 . Specifically, The ratio of the area of ​​the elastic element 11 to the area of ​​the magnetic isolation zone 101 is considered important. A ratio greater than 6 results in the elastic element 11 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 elastic element 11 occupying too large an area, causing magnetic leakage in the magnet 13, reducing the back EMF, and decreasing motor efficiency. Therefore, proper control is crucial. The ratio can balance the supporting effect of the elastic element 11 with the efficiency of the motor, thereby improving the overall performance of the motor.

[0068] Combination Figure 2 In some embodiments of the present invention, the rotor core 100 includes a plurality of rotor laminations 10 stacked axially. When the plurality of rotor laminations 10 are stacked axially, the elastic element 11 can be bent to contact the mating portion 131. Specifically, bending the elastic element 11 to contact the mating portion 131 of the magnet 13 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 mating portion 131 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.

[0069] More specifically, combined Figure 2The rotor lamination 10 has multiple magnet slots 110 along its circumference. Multiple magnetic isolation zones 101 are provided between the magnet slots 110 and the central ring 14. Some of these magnetic isolation zones 101 have elastic elements 11, while others do not. When multiple rotor laminations 10 are stacked, the first and second rotor laminations rotate by a predetermined angle. Since the second rotor lamination 10 does not have an elastic element 11, this magnetic isolation zone 101 provides clearance for the elastic element 11 of the first rotor lamination. Furthermore, depending on the arrangement of the elastic elements 11, when the third rotor lamination 10 is stacked on top of the second rotor lamination 10, the magnetic isolation zone 101 without an elastic element 11 is axially opposite to the elastic element 11 of the first rotor lamination 10, further providing clearance for the elastic element 11.

[0070] Optionally, the elastic elements 11 on the rotor laminations 10 are symmetrically distributed in the circumferential direction of the rotor core 100.

[0071] More specifically, combined Figure 2 When the rotor core 100 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 achieving an interference fit between the elastic element 11 and the magnet 13.

[0072] Furthermore, the bending angle sp of the elastic element 11 satisfies the condition 10° < sp < 45°. Specifically, if the bending angle of the elastic element 11 is less than 10°, the elastic element 11 has high structural strength, but the cooperation effect with the magnet 13 is poor, resulting in a poor fixing effect of the elastic element 11 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, a balance can be achieved between the elastic element 11 and the preload. More specifically, the bending effect of the elastic element 11 can be controlled by controlling the length of the elastic element 11 extending into the mating part 131.

[0073] Combination Figure 1 In some embodiments of the present invention, the magnets 13 are symmetrically distributed in the circumferential direction of the rotor core 100, 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 1000, and the stacked distribution of the magnets 13 is beneficial to reducing noise.

[0074] 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.

[0075] Combination Figure 1 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 100 and improve the structural stability of the rotor core 100.

[0076] 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.

[0077] According to an embodiment of the present invention, the motor includes a stator assembly and a rotor assembly 1000, wherein the rotor assembly 1000 is the rotor assembly 1000 described above, and the rotor assembly 1000 is fitted onto the stator assembly.

[0078] According to the embodiments of the present invention, by applying the aforementioned rotor assembly 1000, 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.

[0079] In some embodiments of the present invention, the length of the rotor assembly 1000 in the axial direction is L3, the length of the stator assembly is L4, and the length difference between the rotor assembly 1000 and the stator assembly is L, satisfying L3 = L4 + L. That is, in the axial direction, the length of the rotor assembly 1000 is different from the length of the stator assembly; the length of the rotor assembly 1000 is greater than the length of the stator assembly. The axial length of the rotor assembly 1000 is greater than that of the stator assembly, resulting in a larger starting speed and moment of inertia of the motor.

[0080] 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 1000 and the stator assembly 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. This invention is not limited to this.

[0081] The compressor according to an embodiment of the present invention includes the aforementioned motor. By applying the aforementioned motor, 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.

[0082] The refrigeration equipment according to embodiments of the present invention includes the aforementioned motor; or includes the aforementioned compressor. 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.

[0083] The rotor assembly 1000 and the motor of a specific embodiment of the present invention are described below with reference to the accompanying drawings.

[0084] This invention proposes a rotor assembly 1000 for a reciprocating refrigerator compressor motor. The rotor core 100 has a magnet slot 110. Near the magnet slot 110, the rotor core 100 has one or more pairs of protruding elastic elements 11. The portion of the elastic element 11 that contacts the magnet 13 is an arc-shaped contact. There are no elastic elements 11 at other magnetic pole positions. During the stacking of rotor laminations 10, each layer of rotor laminations 10 rotates by a specific angle. The bottom and top of the magnet slot 110 are in contact with the magnet 13. When the magnet 13 is inserted into the magnet slot 110, the magnet 13 is fixed to the magnet 13 by the protruding elastic elements 11 in the magnet slot 110. The elastic elements 11 have sufficient bending space, which, in a wide range of contact, can generate sufficient elastic force to fix the magnet 13 to the core while avoiding plastic deformation and loss of resilience. The rotor core 100, elastic element 11, and magnet 13 structure according to embodiments of the present invention can limit the swaying of the magnet 13 and reduce the overall cost of the motor.

[0085] Specifically, the rotor assembly 1000 according to an embodiment of the present invention includes a rotor core 100, a magnet 13, and an elastic element 11. By utilizing the structure of the elastic element 11 and the structural features of the magnet 13 having a recessed mating part 131, the elastic element 11 can fix the inserted magnet 13, which can ensure the clearance fit between the magnet 13 and the magnet slot 110, provide sufficient fixing strength for the magnet 13, and prevent the magnet 13 from breaking. This eliminates the need for end plates at both ends of the rotor and enables simple assembly.

[0086] Furthermore, the rotor core 100 has a plurality of magnet slots 110 evenly arranged along the circumferential direction, which are arranged and stacked along the axial direction. The rotor core 100 is a silicon steel core, and a pair of elastic elements 11 are provided in a specific magnet slot 110. The elastic elements 11 are 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 elements 11, causing the elastic elements 11 to deform. The deformation elastic force of the elastic elements 11 is used to fix the magnet 13 in the magnet slot 110.

[0087] Furthermore, the magnet 13 in contact with the elastic member 11 is provided with a mating part 131. The mating part 131 is constructed as an arc surface structure or has a first arc-shaped mating surface 1311. The arc-shaped structure is conducive to better contact between the elastic member 11 and the magnet 13. Specifically, the width of the arc surface of the mating part 131 is greater than the width of the elastic member 11.

[0088] Preferably, the rotor lamination 10 rotates by the angle of one magnetic pole each time it is stacked, ensuring that the elastic element 11 and the magnet 13 are in contact at each magnetic pole position in the axial direction.

[0089] The present invention also protects a compressor, which is a DC inverter compressor, wherein the rotor core 100 adopts an elastic element 11 to fix the magnet 13 structure, which enhances the stability of the magnet 13, is beneficial to the overall manufacturability of the motor rotor, improves the overall utilization rate of the motor, and reduces the overall cost of the product.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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 (1000), characterized in that, include: The rotor core (100) includes a central ring (14) and a plurality of magnetically conductive parts (12) arranged circumferentially. The radial inner ends of the plurality of magnetically conductive parts (12) are respectively connected to the central ring (14). A magnet slot (110) is defined between adjacent magnetically conductive parts (12). A magnetic isolation area (101) is provided between the magnet slot (110) and the central ring (14). A magnet (13) is disposed in the magnet groove (110), and the inner radial end face of the magnet (13) is provided with a mating part (131) that is recessed in the radial direction. An elastic element (11) is disposed in the magnetic shielding area (101) and is radially opposite to the mating part (131). The elastic element (11) extends into the mating part (131) and contacts and engages with at least the radial sidewall of the mating part (131).

2. The rotor assembly (1000) according to claim 1, characterized in that, The radial sidewall of the mating part (131) is formed as a first arc-shaped mating surface (1311), and the elastic member (11) contacts the first arc-shaped mating surface (1311).

3. The rotor assembly (1000) according to claim 2, characterized in that, The end of the elastic element (11) is provided with a second arc-shaped mating surface (112), which contacts the first arc-shaped mating surface (1311).

4. The rotor assembly (1000) according to claim 3, characterized in that, The arc length of the first arc-shaped mating surface (1311) is L1, and the arc length of the second arc-shaped mating surface (112) is L2, where L2 < L1; or The central angle of the second arc-shaped mating surface (112) is greater than the central angle of the first arc-shaped mating surface (1311).

5. The rotor assembly (1000) according to claim 1, characterized in that, The elastic element (11) includes a first part (11a) and a second part (11b), the first part (11a) being connected to the central ring (14) and the second part (11b) being in contact with the magnet (13); In the circumferential direction of the rotor core (100), the maximum width of the second part (11b) is W1, the maximum width of the first part (11a) is W2, the maximum width of the magnet (13) is W, and the maximum straight-line distance between the middle parts of the opposite sidewalls of the magnetic isolation zone (101) is W3. In the radial direction of the rotor core (100), the maximum dimension of the magnet (13) is H, the shortest distance between the mating part (131) and the radial end face of the magnet (13) is H1, the maximum dimension of the second part (11b) is H2, and the maximum dimension of the first part (11a) is H3, and satisfies the following conditions: and 6. The rotor assembly (1000) according to claim 5, characterized in that, The magnetic conductive part (12) is connected to the central ring (14) via an inner magnetic bridge (124), the maximum circumferential dimension of the inner magnetic bridge (124) being W4, and 7. The rotor assembly (1000) according to claim 1, characterized in that, On the same cross-section of the rotor core (100), the area of ​​the magnetic isolation zone (101) without the elastic element (11) is S1, and the area of ​​the elastic element (11) is S2, which satisfies the condition. The units for S1 and S2 are mm. 2 .

8. The rotor assembly (1000) according to claim 1, characterized in that, The rotor core (100) includes a plurality of rotor laminations (10) stacked along the axial direction. When the plurality of rotor laminations (10) are stacked along the axial direction, the elastic element (11) can be bent to contact the mating part (131). The bending angle of the elastic element (11) is sp, which satisfies 10° < sp < 45°.

9. An electric motor, characterized in that, include: Stator assembly, Rotor assembly (1000), said rotor assembly (1000) is the rotor assembly (1000) according to any one of claims 1-8.

10. The motor according to claim 9, characterized in that, In the axial direction, the length of the rotor assembly (1000) is L3, the length of the stator assembly is L4, and the length difference between the rotor assembly (1000) and the stator assembly is L, satisfying that L3=L4+L, and 5mm≤L≤15mm.

11. A compressor, characterized in that, Includes the motor described in claim 9 or 10.

12. A refrigeration device, characterized in that, It includes the motor as described in claim 9 or 10; or it includes the compressor as described in claim 11.

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