Rotor assembly, electric machine, compressor and refrigeration appliance

Abstract

The application discloses a rotor assembly, a motor, a compressor and a refrigeration device. The rotor assembly comprises: a rotor core; a magnetic steel, which is arranged in the rotor core along an axial direction of the rotor core; and a rotor cover plate, which is arranged on one side of the rotor core in the axial direction and is provided with a hollow part. At least part of the hollow part is opposite to the magnetic steel along the axial direction of the rotor core. The rotor cover plate is a magnetic conducting part. The area of a cross section of the magnetic steel perpendicular to the axial direction of the rotor core is S1, the area of a cross section of the hollow part perpendicular to the axial direction of the rotor core is S2, and S1 and S2 satisfy the following formula: S1 / S2>1. The unit of S1 and S2 is mm 2 The rotor assembly according to the application can ensure reliable fixation of the magnetic steel in the rotor core while reducing the magnetic field generated by the magnetic steel and transmitted to the rotor cover plate, thereby effectively improving the working efficiency of the motor and reducing the production cost.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a rotor assembly, a motor, a compressor, and a refrigeration device. Background Technology

[0002] In related technologies, a rotor cover plate is provided on one axial side of the rotor core. The magnetic field generated by the magnets inside the rotor core is easily transmitted to the rotor cover plate, which leads to a reduction in the working efficiency of the motor. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a rotor assembly that, while reducing the magnetic field generated by the magnets and transmitting it to the rotor cover plate, ensures that the magnets are reliably fixed within the rotor core, effectively improving the working efficiency of the motor and reducing production costs.

[0004] Another object of the present invention is to provide an electric motor having the above-described rotor assembly.

[0005] Another object of the present invention is to provide a compressor having the above-mentioned motor.

[0006] Another object of the present invention is to provide a refrigeration device having the above-described compressor.

[0007] According to an embodiment of the present invention, a rotor assembly includes: a rotor core; a magnet, the magnet being disposed within the rotor core along the axial direction; and a rotor cover plate, the rotor cover plate being disposed on one axial side of the rotor core, the rotor cover plate having a hollow portion, at least a portion of the hollow portion being opposite to the magnet along the axial direction of the rotor core, the rotor cover plate being a magnetic conductive element, wherein the area of ​​the cross-section of the opposing magnet perpendicular to the axial direction of the rotor core is S1, the area of ​​the cross-section of the hollow portion perpendicular to the axial direction of the rotor core is S2, and satisfies: The units for S1 and S2 are mm. 2 .

[0008] According to an embodiment of the present invention, a rotor assembly is provided with a magnet inserted into the rotor core along the axial direction. A rotor cover plate is disposed on one side of the rotor core along the axial direction. The rotor cover plate can limit the magnet and prevent it from coming out of the rotor core. The rotor cover plate is a magnetic conductive component and has a hollow portion. At least a portion of the hollow portion is opposite to the magnet. The cross-sectional area of ​​the magnet perpendicular to the axial direction of the rotor core is S1, and the cross-sectional area of ​​the hollow portion perpendicular to the axial direction of the rotor core is S2, satisfying the following: It can prevent the magnets from coming out of the hollow part and reduce the magnetic field generated by the magnets from being transmitted to the rotor cover plate, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly.

[0009] In addition, the rotor assembly according to the above embodiments of the present invention may also have the following additional technical features:

[0010] According to some embodiments of the present invention, the hollow portion is provided with reinforcing ribs, and the two ends of the reinforcing ribs in the length direction are respectively connected to the two opposite ends of the hollow portion.

[0011] According to some embodiments of the present invention, the width of the reinforcing rib is T1 in the projection on a plane perpendicular to the axial direction of the rotor core, and satisfies: 0.5mm≤T1≤2.5mm.

[0012] According to some embodiments of the present invention, the magnet includes a first magnet, the hollow portion includes a first hollow portion, along the axial direction of the rotor core, the first hollow portion is at least partially opposite to the first magnet, the first magnet is a plurality of magnets spaced apart along the circumferential direction of the rotor core, and the first hollow portion is a plurality of magnets corresponding one-to-one with the plurality of first magnets.

[0013] According to some embodiments of the present invention, the first hollow portion is a strip-shaped hole, and the two ends of the first hollow portion in the length direction are spaced apart along the circumferential direction of the rotor core.

[0014] According to some embodiments of the present invention, the magnet further includes a second magnet, which is disposed radially outside the first magnet and located between two adjacent first magnets. The hollow portion further includes a second hollow portion. Along the axial direction of the rotor core, the second hollow portion is at least partially opposite to the second magnet. The second magnet is a plurality of magnets spaced apart along the circumferential direction of the rotor core. A second magnet is disposed between any two adjacent first magnets. The second hollow portion is a plurality of magnets corresponding one-to-one with the plurality of second magnets.

[0015] According to some embodiments of the present invention, the area of ​​the cross-section of the first magnet disposed opposite to the rotor core in the axial direction is S3, the area of ​​the cross-section of the first hollow portion in the axial direction of the rotor core in the axial direction is S4, and satisfies: The units for S3 and S4 are mm. 2 .

[0016] According to some embodiments of the present invention, in the projection on a plane perpendicular to the axial direction of the rotor core, the projection of the rotor cover plate is located within the outer contour of the projection of the rotor core; and / or, in the projection on a plane perpendicular to the axial direction of the rotor core, the outer contour of the rotor cover plate is formed as a circle or a polygon; and / or, in the projection on a plane perpendicular to the axial direction of the rotor core, the oppositely arranged hollow portions are located within the projection of the magnet.

[0017] The motor according to an embodiment of the present invention includes the rotor assembly described in the embodiment of the present invention.

[0018] According to an embodiment of the present invention, a motor is provided in which a magnet is inserted into the rotor core along the axial direction. A rotor cover plate is disposed on one side of the rotor core along the axial direction. The rotor cover plate can limit the magnet and prevent it from coming out of the rotor core. The rotor cover plate is a magnetic conductive component and has a hollow portion. At least a portion of the hollow portion is opposite to the magnet. The cross-sectional area of ​​the magnet perpendicular to the axial direction of the rotor core is S1, and the cross-sectional area of ​​the hollow portion perpendicular to the axial direction of the rotor core is S2, satisfying the following: It can prevent the magnets from coming out of the hollow part and reduce the magnetic field generated by the magnets from being transmitted to the rotor cover plate, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly.

[0019] The compressor according to an embodiment of the present invention includes the motor described in the embodiment of the present invention.

[0020] According to an embodiment of the compressor of the present invention, a magnet is inserted into the rotor core along the axial direction. A rotor cover plate is disposed on one side of the rotor core. The rotor cover plate can limit the magnet and prevent it from coming out of the rotor core. The rotor cover plate is a magnetic conductive component and has a hollow portion. At least a portion of the hollow portion is opposite to the magnet. The cross-sectional area of ​​the magnet perpendicular to the axial direction of the rotor core is S1, and the cross-sectional area of ​​the hollow portion perpendicular to the axial direction of the rotor core is S2, satisfying: It can prevent the magnets from coming out of the hollow part and reduce the magnetic field generated by the magnets from being transmitted to the rotor cover plate, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly.

[0021] The refrigeration equipment according to an embodiment of the present invention includes the compressor described in the embodiment of the present invention.

[0022] According to an embodiment of the refrigeration device of the present invention, a magnet is inserted into the rotor core along the axial direction. A rotor cover plate is disposed on one side of the rotor core along the axial direction. The rotor cover plate can limit the magnet and prevent it from coming out of the rotor core. The rotor cover plate is a magnetic conductive component and has a hollow portion. At least a portion of the hollow portion is opposite to the magnet. The cross-sectional area of ​​the magnet perpendicular to the axial direction of the rotor core is S1, and the cross-sectional area of ​​the hollow portion perpendicular to the axial direction of the rotor core is S2, satisfying: It can prevent the magnets from coming out of the hollow part and reduce the magnetic field generated by the magnets from being transmitted to the rotor cover plate, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of a rotor assembly according to some embodiments of the present invention;

[0026] Figure 2 This is an exploded view of a rotor assembly according to some embodiments of the present invention;

[0027] Figure 3 This is a top view of a rotor assembly according to some embodiments of the present invention (wherein the rotor cover is not shown);

[0028] Figure 4 This is a schematic diagram of the structure of the rotor cover plate of a rotor assembly according to some embodiments of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of a rotor assembly according to other embodiments of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the rotor cover plate of a rotor assembly according to other embodiments of the present invention.

[0031] Figure label:

[0032] 100. Rotor assembly;

[0033] 10. Rotor core; 11. Rotor laminations;

[0034] 20. Magnet; 21. First magnet; 22. Second magnet;

[0035] 30. Rotor cover plate; 31. Hollowed-out section; 311. Reinforcing rib;

[0036] 41. First openwork section; 42. Second openwork section;

[0037] 50. Fasteners. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown 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 are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] In the description of this invention, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "above," "over," and "on top" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0041] The rotor assembly 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0042] Reference Figures 1-6 As shown, the rotor assembly 100 according to an embodiment of the present invention may include: a rotor core 10, a magnet 20, and a rotor cover plate 30.

[0043] Specifically, the magnet 20 is along the axial direction of the rotor core 10 (e.g., Figure 2The rotor cover plate 30 (shown in the vertical direction) is inserted into the rotor core 10, allowing the magnet 20 to be installed within the rotor core 10. The rotor cover plate 30 is located on one axial side of the rotor core 10, limiting the magnet 20 and preventing it from detaching from the rotor core 10, thus ensuring the reliable operation of the rotor assembly 100. Furthermore, the rotor cover plate 30 can be a magnetic conductor, which is low-cost, reducing the production cost of the rotor cover plate 30 and consequently lowering the production cost of the rotor assembly 100.

[0044] In related technologies, the magnetic field generated by the magnets inside the rotor core is easily transmitted to the rotor cover plate, thereby reducing the motor's operating efficiency. Therefore, in this invention, as... Figures 1-6 As shown, the rotor cover plate 30 has a hollow portion 31. Along the axial direction of the rotor core 10, at least a portion of the hollow portion 31 is opposite to the magnet 20. The hollow portion 31 can reduce the magnetic field generated by the magnet 20 from being transmitted to the rotor cover plate 30 of the magnetic conductor, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, according to the formula: Since the total magnetic flux of the motor remains constant, by reducing the leakage flux coefficient, the main magnetic flux of the motor can be increased, effectively reducing the phase current of the motor operation, thereby improving the working efficiency of the motor and reducing the cost of the rotor cover plate 30, thereby reducing the production cost of the rotor assembly 100.

[0045] Furthermore, the area of ​​the cross-section of the magnet 20 perpendicular to the axial direction of the rotor core 10 is S1, and the area of ​​the cross-section of the hollow portion 31 perpendicular to the axial direction of the rotor core 10 is S2, and the following conditions are met: The units for S1 and S2 are mm. 2 Therefore, within the aforementioned range, it is possible to prevent the magnet 20 from detaching from the hollow portion 31, ensuring that the magnet 20 is reliably fixed within the rotor core 10, and effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, thereby increasing the main magnetic flux of the motor, effectively reducing the phase current during motor operation, and improving the working efficiency of the motor.

[0046] It should be noted that, for ease of description, the orientations such as "up and down" in this invention are based on the orientation relationships shown in the accompanying drawings, and are not a limitation on the orientation in actual application.

[0047] In some embodiments, such as Figure 1 , Figure 2 and Figure 5 As shown, the rotor core 10 includes multiple (two or more) rotor laminations 11. The multiple rotor laminations 11 are stacked and arranged to form the rotor core 10, which facilitates the processing and manufacturing of the rotor core 10 and reduces the energy consumption during magnetization and demagnetization, effectively improving the motor efficiency.

[0048] In some embodiments, the specific structure of the plurality of rotor laminations 11 can be set according to actual conditions to meet different assembly and use requirements.

[0049] In some embodiments, such as Figure 2 As shown, the rotor assembly 100 also includes a plurality of fasteners 50, which are sequentially inserted through the rotor cover plate 30 and the rotor core 10 to connect the rotor cover plate 30 and the rotor core 10, ensuring that the rotor cover plate 30 is reliably fixed on the rotor core 10. This ensures that the rotor cover plate 30 reliably limits the magnet 20 and prevents the magnet 20 from coming out. For example, the fasteners 50 can be rivets, etc.

[0050] In embodiments of the present invention, the number of fasteners 50 can be flexibly set according to actual conditions. For example, the number of fasteners 50 can be as follows: Figure 2 The number shown is four, but it can also be two, three, five, six or more, all of which are within the protection scope of this invention.

[0051] According to an embodiment of the present invention, the rotor assembly 100 has a magnet 20 inserted into the rotor core 10 along the axial direction. A rotor cover plate 30 is disposed on one axial side of the rotor core 10. The rotor cover plate 30 can limit the magnet 20, preventing it from detaching from the rotor core 10. The rotor cover plate 30 is a magnetically conductive component. A hollow portion 31 is provided on the rotor cover plate 30, at least a portion of which is opposite to the magnet 20. The area of ​​the cross-section of the opposing magnet 20 perpendicular to the axial direction of the rotor core 10 is S1, and the area of ​​the cross-section of the hollow portion 31 perpendicular to the axial direction of the rotor core 10 is S2, satisfying the following: It can prevent the magnet 20 from coming out of the hollow part 31 and reduce the magnetic field generated by the magnet 20 from being transmitted to the rotor cover plate 30, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly 100.

[0052] In some embodiments of the present invention, such as Figures 1-6 As shown, there are multiple magnets 20 spaced apart (two or more). The multiple magnets 20 can improve the working efficiency of the motor. The multiple hollow parts 31 correspond one-to-one with the multiple magnets 20. The multiple hollow parts 31 arranged in opposite directions can prevent the magnetic field generated by the multiple magnets 20 from being transmitted to the rotor cover plate 30, which is beneficial to improving the working efficiency of the motor.

[0053] According to some embodiments of the present invention, such as Figure 5 and Figure 6As shown, the hollowed-out portion 31 is provided with a reinforcing rib 311. The two ends of the reinforcing rib 311 in the length direction are respectively connected to the two opposite ends of the hollowed-out portion 31. The reinforcing rib 311 can improve the structural strength of the hollowed-out portion 31, avoid deformation of the hollowed-out portion 31, and block the magnet 20 to prevent the magnet 20 from coming out of the hollowed-out portion 31, ensuring that the rotor cover plate 30 can reliably limit the magnet 20, so that the rotor assembly 100 can work reliably.

[0054] In some embodiments, such as Figure 5 and Figure 6 As shown, there can be multiple reinforcing ribs 311, which are spaced apart in the hollow part 31. The multiple reinforcing ribs 311 can ensure the structural strength of different positions of the hollow part 31, avoid deformation of the hollow part 31, and ensure that the magnet 20 is reliably limited in the rotor core 10.

[0055] In embodiments of the present invention, the number of reinforcing ribs 311 can be flexibly set according to actual conditions. For example, the number of reinforcing ribs 311 can be as follows: Figure 6 The number shown is three, but it can also be two, four, five, six or more, all of which are within the protection scope of this invention.

[0056] In some embodiments of the present invention, such as Figure 6 As shown, within the projection on the plane perpendicular to the axial direction of the rotor core 10, the width of the reinforcing rib 311 is T1, and satisfies: 0.5mm ≤ T1 ≤ 2.5mm. Therefore, within the above range, the structural strength of the reinforcing rib 311 can be ensured, avoiding deformation and other problems, thereby ensuring the structural strength of the hollow portion 31. Furthermore, it can effectively reduce the leakage magnetic coefficient at the end of the rotor assembly 100, increase the main magnetic flux of the motor, effectively reduce the phase current during motor operation, and improve the motor's operating efficiency. For example, in some specific embodiments, the width of the reinforcing rib 311 within the projection on the plane perpendicular to the axial direction of the rotor core 10 can be 0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, etc.

[0057] According to some embodiments of the present invention, such as Figures 1-6 As shown, the magnet 20 includes a first magnet 21, and the hollow portion 31 includes a first hollow portion 41. Along the axial direction of the rotor core 10, the first hollow portion 41 is at least partially opposite to the first magnet 21. The first hollow portion 41 can reduce the magnetic field generated by the first magnet 21 from being transmitted to the rotor cover plate 30, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, and thus improving the working efficiency of the motor.

[0058] In addition, such as Figures 1-6 As shown, there are multiple first magnets 21, which are spaced apart along the circumferential direction of the rotor core 10. The first hollow portion 41 corresponds one-to-one with the multiple first magnets 21. The multiple first magnets 21 can improve the working efficiency of the motor, and the multiple hollow portions 41 arranged opposite to each other can prevent the magnetic field generated by the multiple first magnets 21 from being transmitted to the rotor cover plate 30, which is beneficial to improving the working efficiency of the motor.

[0059] In embodiments of the present invention, the number of first magnets 21 can be flexibly set according to actual conditions. For example, the number of first magnets 21 can be as follows: Figure 3 The number shown is four, but it can also be two, three, five, six or more, all of which are within the protection scope of this invention.

[0060] In embodiments of the present invention, the specific shape of the hollow portion 31 can be set according to actual conditions. For example, the hollow portion 31 can be a triangular hole or a circular hole, etc.

[0061] For example, in some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the first hollow portion 41 can be a strip-shaped hole, which makes the structure of the first hollow portion 41 simple and facilitates the processing and manufacturing of the first hollow portion 41. The two ends of the first hollow portion 41 in the length direction are spaced apart along the circumferential direction of the rotor core 10, ensuring that the multiple first hollow portions 41 are arranged compactly on the rotor cover plate 30, which facilitates the multiple first hollow portions 41 to be opposite at least part of the multiple first magnets 21.

[0062] In some embodiments of the present invention, such as Figure 3 As shown, the magnet 20 also includes a second magnet 22, which is located radially outside the first magnet 21 and between two adjacent first magnets 21. By setting the first magnet 21 and the second magnet 22, different working requirements of the rotor assembly 100 can be met, which is beneficial to improving the working efficiency of the motor.

[0063] In addition, such as Figure 1 , Figure 2 , Figures 4-6 As shown, the hollowed-out portion 31 also includes a second hollowed-out portion 42. Along the axial direction of the rotor core 10, the second hollowed-out portion 42 is at least partially opposite to the second magnet 22. The second hollowed-out portion 42 can reduce the magnetic field generated by the second magnet 22 from being transmitted to the rotor cover plate 30, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, and thus improving the working efficiency of the motor.

[0064] At the same time, such as Figures 1-6As shown, there are multiple second magnets 22, which are spaced apart along the circumferential direction of the rotor core 10. A second magnet 22 is provided between any two adjacent first magnets 21. The second hollow part 42 is a plurality of parts corresponding one-to-one with the plurality of second magnets 22. The multiple second magnets 22 can improve the working efficiency of the motor, and the multiple hollow parts 42 arranged opposite to each other can prevent the magnetic field generated by the multiple second magnets 22 from being transmitted to the rotor cover plate 30, which is beneficial to improving the working efficiency of the motor.

[0065] In embodiments of the present invention, the number of second magnets 22 can be flexibly set according to actual conditions. For example, the number of second magnets 22 can be as follows: Figure 3 The number shown is four, but it can also be two, three, five, six or more, all of which are within the protection scope of this invention.

[0066] In some embodiments of the present invention, the area of ​​the cross-section of the first magnet 21 perpendicular to the axial direction of the rotor core 10 is S3, and the area of ​​the cross-section of the first hollow portion 41 perpendicular to the axial direction of the rotor core 10 is S4, and satisfies: The units for S3 and S4 are mm. 2 Therefore, within the aforementioned range, the first magnet 21 can be prevented from detaching from the first hollow portion 41, and the leakage magnetic coefficient at the end of the rotor assembly 100 can be effectively reduced, thereby increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor operation, and improving the working efficiency of the motor.

[0067] In some specific embodiments, such as Figures 1-4 As shown, the magnet 20 includes a first magnet 21 and a second magnet 22. The second magnet 22 is located radially outside the first magnet 21 and between two adjacent first magnets 21. The hollow portion 31 includes a first hollow portion 41 and a second hollow portion 42. The first hollow portion 41 is arranged opposite to the first magnet 21, and the second hollow portion 42 is arranged opposite to the second magnet 22. Both the first hollow portion 41 and the second hollow portion 42 are strip-shaped holes. The length of the first magnet 21 is L1, and the width of the first magnet 21 is W1. The length of the second magnet 22 is L2, and the width of the second magnet 22 is W2. The length of the first hollow portion 41 is L3, and the width of the first hollow portion 41 is W3. The length of the second hollow portion 42 is L4, and the width of the second hollow portion 42 is W4. Where S1 = L2 × W2, S2 = L4 × W4, S3 = L1 × W1, and S4 = L3 × W3, and the units of L1, L2, L3, L4, W1, W2, W3, and W4 are mm. Satisfying: That is, satisfying: satisfy: That is, satisfying: Therefore, as shown in Table 1 below, through Meeting the above range can effectively reduce the leakage flux coefficient at the end of the rotor assembly 100, increase the main magnetic flux of the motor, reduce the phase current of the motor operation, and improve the working efficiency of the motor.

[0068] Table 1

[0069]

[0070] In some specific embodiments, such as Figure 3 , Figure 5 and Figure 6 As shown, the magnet 20 includes a first magnet 21 and a second magnet 22. The second magnet 22 is located radially outside the first magnet 21 and between two adjacent first magnets 21. The hollow portion 31 includes a first hollow portion 41 and a second hollow portion 42. The first hollow portion 41 is opposite to the first magnet 21, and the second hollow portion 42 is opposite to the second magnet 22. Both the first hollow portion 41 and the second hollow portion 42 are strip-shaped holes. The first hollow portion 41 is provided with a reinforcing rib 311, and the two ends of the reinforcing rib 311 in the length direction are respectively connected to the two ends opposite to the first hollow portion 41. In the projection on the plane perpendicular to the axial direction of the rotor core 10, the width of the reinforcing rib 311 is T1, and satisfies: 0.5mm≤T1≤2.5mm. The length of the second magnet 22 is L2, and the width of the second magnet 22 is W2. The length of the second hollow portion 42 is L4, and the width of the second hollow portion 42 is W4. Where S1 = L2 × W2, S2 = L4 × W4, and the units of L2, L4, W2, and W4 are mm. Satisfying: That is, satisfying: Therefore, as shown in Table 2 below, through If T1 meets the above range, it can effectively reduce the leakage magnetic coefficient at the end of the rotor assembly 100, increase the main magnetic flux of the motor, reduce the phase current of the motor operation, and improve the working efficiency of the motor.

[0071] Table 2

[0072]

[0073]

[0074] According to some embodiments of the present invention, such as Figure 1 , Figure 2 and Figure 5 As shown, there are two rotor cover plates 30, which are respectively located on both sides of the rotor core 10 in the axial direction. The two rotor cover plates 30 can limit the magnet 20 on both sides of the rotor core 10 in the axial direction, preventing the magnet 20 from coming out from one side of the rotor core 10 in the axial direction, ensuring reliable limiting of the magnet 20, and thus ensuring reliable operation of the rotor assembly 100.

[0075] In some embodiments of the present invention, such as Figure 1 and Figure 5 As shown, in the projection on the plane perpendicular to the axial direction of the rotor core 10, the projection of the rotor cover plate 30 is located within the outer contour of the projection of the rotor core 10. Thus, while ensuring that the rotor cover plate 30 limits the magnet 20, the volume of the rotor cover plate 30 is effectively reduced, thereby reducing the production cost of the rotor cover plate 30.

[0076] In embodiments of the present invention, the specific shape of the rotor cover 30 can be set according to actual conditions.

[0077] For example, in some embodiments, the outer contour of the rotor cover 30 can be formed as a circle in the projection onto a plane perpendicular to the axial direction of the rotor core 10, or, as... Figure 1 , Figure 2 , Figures 4-6 As shown, the outer contour of the rotor cover 30 can be formed into a polygon in the projection on the plane perpendicular to the axial direction of the rotor core 10. This can be customized according to actual conditions to meet different usage requirements of the rotor cover 30. For example, the outer contour of the rotor cover 30 can be formed into an octagon in the projection on the plane perpendicular to the axial direction of the rotor core 10.

[0078] According to some embodiments of the present invention, the hollowed-out portion 31 is located within the projection of the magnet 20 on the plane perpendicular to the axial direction of the rotor core 10. This allows the magnet 20 to leak out of the hollowed-out portion 31 as much as possible, reducing the magnetic field generated by the magnet 20 from being transmitted to the rotor cover plate 30, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, and improving the working efficiency of the motor.

[0079] In some embodiments, a portion of the rotor core 10 is exposed from the cutout portion 31, which enables different mating positions between the rotor cover plate 30 and the rotor core 10, reduces the installation accuracy of the rotor cover plate 30, and improves assembly efficiency.

[0080] The motor according to an embodiment of the present invention includes a rotor assembly 100 according to an embodiment of the present invention. Since the rotor assembly 100 according to the embodiment of the present invention has the aforementioned beneficial technical effects, in the motor according to the embodiment of the present invention, a magnet 20 is inserted into the rotor core 10 along the axial direction, and a rotor cover plate 30 is disposed on one axial side of the rotor core 10. The rotor cover plate 30 can limit the magnet 20, preventing the magnet 20 from detaching from the rotor core 10. The rotor cover plate 30 is a magnetically conductive component, and a hollow portion 31 is provided on the rotor cover plate 30. At least a portion of the hollow portion 31 is opposite to the magnet 20. The area of ​​the cross-section of the opposing magnet 20 perpendicular to the axial direction of the rotor core 10 is S1, and the area of ​​the cross-section of the hollow portion 31 perpendicular to the axial direction of the rotor core 10 is S2, satisfying: It can prevent the magnet 20 from coming out of the hollow part 31 and reduce the magnetic field generated by the magnet 20 from being transmitted to the rotor cover plate 30, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly 100.

[0081] The compressor according to an embodiment of the present invention includes a motor according to an embodiment of the present invention. Since the motor according to the embodiment of the present invention has the aforementioned beneficial technical effects, the compressor according to the embodiment of the present invention uses a magnet 20 inserted into the rotor core 10 along the axial direction. A rotor cover plate 30 is disposed on one axial side of the rotor core 10. The rotor cover plate 30 can limit the magnet 20, preventing it from detaching from the rotor core 10. The rotor cover plate 30 is a magnetically conductive component, and a hollow portion 31 is provided on the rotor cover plate 30. At least a portion of the hollow portion 31 is opposite to the magnet 20. The area of ​​the cross-section of the opposing magnet 20 perpendicular to the axial direction of the rotor core 10 is S1, and the area of ​​the cross-section of the hollow portion 31 perpendicular to the axial direction of the rotor core 10 is S2, satisfying: It can prevent the magnet 20 from coming out of the hollow part 31 and reduce the magnetic field generated by the magnet 20 from being transmitted to the rotor cover plate 30, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly 100.

[0082] The refrigeration device according to an embodiment of the present invention includes a compressor according to an embodiment of the present invention. Since the compressor according to the embodiment of the present invention has the aforementioned beneficial technical effects, the refrigeration device according to the embodiment of the present invention, wherein a magnet 20 is inserted into the rotor core 10 along the axial direction, and a rotor cover plate 30 is disposed on one axial side of the rotor core 10, the rotor cover plate 30 can limit the magnet 20, preventing the magnet 20 from detaching from the rotor core 10, and the rotor cover plate 30 is a magnetic conductive element, and a hollow portion 31 is provided on the rotor cover plate 30, at least a portion of which is opposite to the magnet 20. The area of ​​the cross-section of the opposing magnet 20 perpendicular to the axial direction of the rotor core 10 is S1, and the area of ​​the cross-section of the hollow portion 31 perpendicular to the axial direction of the rotor core 10 is S2, satisfying: It can prevent the magnet 20 from coming out of the hollow part 31 and reduce the magnetic field generated by the magnet 20 from being transmitted to the rotor cover plate 30, effectively reducing the leakage magnetic coefficient at the end of the rotor assembly 100, increasing the main magnetic flux of the motor, effectively reducing the phase current of the motor, improving the working efficiency of the motor, and reducing the production cost of the rotor assembly 100.

[0083] Among them, refrigeration equipment can be refrigerators, etc.

[0084] Other configurations and operations of the rotor assembly 100, motor, compressor, and refrigeration equipment according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0085] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0086] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" 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.

[0087] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that, include: Rotor core; A magnet, which is inserted into the rotor core along the axial direction of the rotor core; A rotor cover plate is disposed on one axial side of the rotor core. The rotor cover plate has a hollow portion along the axial direction of the rotor core, at least a portion of which is opposite to the magnet. The rotor cover plate is a magnetically conductive component. Wherein, the area of ​​the cross-section of the magnet perpendicular to the axial direction of the rotor core is S1, and the area of ​​the cross-section of the hollow portion perpendicular to the axial direction of the rotor core is S2, and the following conditions are met: The units for S1 and S2 are mm. 2 .

2. The rotor assembly according to claim 1, characterized in that, The hollowed-out portion is provided with reinforcing ribs, and the two ends of the reinforcing ribs along the length direction are respectively connected to the two opposite ends of the hollowed-out portion.

3. The rotor assembly according to claim 2, characterized in that, Within the projection on a plane perpendicular to the axial direction of the rotor core, the width of the reinforcing rib is T1, and satisfies: 0.5mm≤T1≤2.5mm.

4. The rotor assembly according to claim 1, characterized in that, The magnet includes a first magnet, and the hollow portion includes a first hollow portion. Along the axial direction of the rotor core, the first hollow portion is at least partially opposite to the first magnet. The first magnet is a plurality of magnets spaced apart along the circumferential direction of the rotor core, and the first hollow portion is a plurality of magnets corresponding one-to-one with the plurality of first magnets.

5. The rotor assembly according to claim 4, characterized in that, The first hollow portion is a strip-shaped hole, and the two ends of the first hollow portion in the length direction are spaced apart along the circumferential direction of the rotor core.

6. The rotor assembly according to claim 4, characterized in that, The magnet also includes a second magnet, which is located radially outside the first magnet and between two adjacent first magnets. The hollow portion also includes a second hollow portion. Along the axial direction of the rotor core, the second hollow portion is at least partially opposite to the second magnet. The second magnet is a plurality of magnets spaced apart along the circumferential direction of the rotor core. A second magnet is provided between any two adjacent first magnets. The second hollow portion is a plurality of magnets that correspond one-to-one with the plurality of second magnets.

7. The rotor assembly according to claim 4, characterized in that, The area of ​​the cross-section of the first magnet perpendicular to the axial direction of the rotor core is S3, and the area of ​​the cross-section of the first hollow portion perpendicular to the axial direction of the rotor core is S4, and the following conditions are met: The units for S3 and S4 are mm. 2 .

8. The rotor assembly according to claim 1, characterized in that, In the projection onto a plane perpendicular to the axial direction of the rotor core, the projection of the rotor cover plate lies within the outer contour of the projection of the rotor core. And / or, in the projection onto a plane perpendicular to the axial direction of the rotor core, the outer contour of the rotor cover is formed as a circle or a polygon; And / or, in the projection onto a plane perpendicular to the axial direction of the rotor core, the oppositely arranged hollow portions are located within the projection of the magnet.

9. An electric motor, characterized in that, Includes the rotor assembly according to any one of claims 1-8.

10. A compressor, characterized in that, Includes the motor according to claim 9.

11. A refrigeration device, characterized in that, Includes the compressor according to claim 10.

Images