Rotor assembly, motor and compressor

Abstract

The present application discloses a rotor assembly, a motor and a compressor, belonging to the technical field of motor manufacturing, wherein the rotor assembly comprises: a rotor core and a magnetic steel, wherein the rotor core is provided with a mounting groove; the magnetic steel is provided in the mounting groove, and in the axial direction of the rotor core assembly, the magnetic steel comprises N first sub-magnetic steel segments, each of which has an axial length of Lef, and the axial dimension of the rotor core is L, and satisfies N=L / Lef, N≥2, and / or in the radial direction of the rotor core assembly, the magnetic steel comprises M second sub-magnetic steel segments, each of which has a radial length of bm1, and the radial length of the magnetic steel is bm, and satisfies M=bm / bm1, M≥2. According to the rotor assembly of the present application, by dividing the magnetic steel into a plurality of sub-magnetic steel segments in the axial direction and radial direction of the rotor core, the eddy current loop area and the eddy current size can be reduced, and the heat and loss generated by the eddy current can be reduced, thereby effectively improving the operating efficiency and reliability of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of motor manufacturing, and in particular to a rotor assembly, a motor and a compressor. Background Art

[0002] With the continuous development of modern industrial technology, the requirements for equipment performance are increasing day by day. As the core component of the drive system, the efficiency of the motor directly affects the energy efficiency performance of the entire system, especially for motors used in compressors and refrigeration equipment. Improving efficiency and reducing energy consumption have always been important research and development goals. During the operation of the motor, the magnet, as a key component, plays the role of transmitting and converting electromagnetic energy. However, in the relevant technology, during the operation of the magnet, the magnet will generate induced current in the changing magnetic field, that is, eddy currents. These eddy currents will not only generate additional heat, but also consume electrical energy, thereby seriously reducing the operating efficiency and reliability of the motor. How to effectively reduce the eddy current loss during the operation of the motor has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to propose a rotor assembly, which can reduce the eddy current loop area and eddy current size, reduce the heat and loss generated by the eddy current, and thus effectively improve the motor operation efficiency and reliability by dividing the magnetic steel into multiple sub-magnetic steel segments in the axial direction and radial direction of the rotor core.

[0004] The present application also proposes a motor having the above rotor assembly.

[0005] The present application also provides a compressor having the above motor.

[0006] According to the rotor assembly of the first aspect of the present application, the rotor assembly includes: a rotor core and a magnetic steel, wherein the rotor core is provided with a mounting groove; the magnetic steel is arranged in the mounting groove, and in the axial direction of the rotor core, the magnetic steel includes N first sub-magnetic steel segments, each of which has an axial length of Lef, the axial dimension of the rotor core is L, and satisfies N=L / Lef, N≥2, and / or in the radial direction of the rotor core, the magnetic steel includes M second sub-magnetic steel segments, each of which has a radial length of bm1, the radial length of the magnetic steel is bm, and satisfies M=bm / bm1, M≥2.

[0007] According to the rotor assembly of the present application, the magnetic steel can be divided into multiple sub-magnetic steel segments in the axial and radial directions of the rotor core to shorten the length of each sub-magnetic steel segment in the direction of magnetic field change, thereby reducing the eddy current loop area and eddy current size, reducing the heat and loss generated by the eddy current, and thus effectively improving the operating efficiency and reliability of the motor.

[0008] According to some embodiments of the present application, the size of the magnetic steel in the magnetization direction is hm, and satisfies .

[0009] Furthermore, the axial lengths of the plurality of first sub-magnetic steel segments are different.

[0010] In some embodiments, the size of the magnetic steel in the magnetization direction is hm, and satisfies .

[0011] Furthermore, the radial lengths of the plurality of second sub-magnetic steel segments are different.

[0012] According to some embodiments of the present application, the mounting groove is configured as any one of a U-shape, a V-shape, a W-shape, and a straight shape.

[0013] According to the motor of the second aspect of the present application, the motor includes: a rotor assembly according to any one of the above embodiments.

[0014] According to the compressor of the third aspect embodiment of the present application, the compressor includes: the motor described in the above embodiment.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic diagram of a rotor assembly according to an embodiment of the first aspect of the present application;

[0018] Figure 2 is a schematic diagram of a rotor assembly with radially segmented magnetic steel according to an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of a first sub-magnetic steel segment according to an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the motor efficiency improvement effect under the axial segmentation of the magnetic steel according to the embodiment of the present application;

[0021] Figure 5 is a schematic diagram of a compressor according to an embodiment of the present application.

[0022] Reference numerals:

[0023] 1000. Compressor;

[0024] 100. Rotor assembly;

[0025] 10. rotor core; 10a. mounting slot;

[0026] 20, magnetic steel; 22, first sub-magnetic steel segment; 24, second sub-magnetic steel segment;

[0027] 200, stator assembly;

[0028] 300, crankshaft;

[0029] 400, main bearing;

[0030] 500, cylinder;

[0031] 600, piston;

[0032] 700. Auxiliary bearing. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0035] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0041] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0042] The term “plurality” used in this application refers to two or more (including two).

[0043] Reference below Figure 1-Figure 5A rotor assembly 100 , a motor, and a compressor 1000 according to embodiments of the present application are described.

[0044] like Figure 1-Figure 3 As shown, according to the rotor assembly 100 of the first embodiment of the present application, the rotor assembly 100 includes: a rotor core 10 and a magnetic steel 20.

[0045] In which, a mounting groove 10a is provided on the rotor core 10; the magnetic steel 20 is arranged in the mounting groove 10a, and in the axial direction of the rotor core 10, the magnetic steel 20 includes N first sub-magnetic steel segments 22, the axial length of each first sub-magnetic steel segment 22 is Lef, the axial dimension of the rotor core 10 is L, and satisfies N=L / Lef, N≥2, and / or in the radial direction of the rotor core 10, the magnetic steel 20 includes M second sub-magnetic steel segments 24, the radial length of each second sub-magnetic steel segment 24 is bm1, the radial length of the magnetic steel 20 is bm, and satisfies M=bm / bm1, M≥2.

[0046] Specifically, the rotor core 10 can be used to support components such as the rotor winding to provide a magnetic flux path. The rotor core 10 is provided with a mounting groove 10a for accommodating the magnetic steel 20. There may be multiple mounting grooves 10a. The multiple mounting grooves 10a can be arranged accordingly according to the design requirements of different magnetic steels 20 to provide mounting positions for multiple magnetic steels 20 and ensure that the magnetic steels 20 can be firmly fixed on the rotor core 10. In the embodiment of the present application, each magnetic steel 20 can be arranged in sections. In some embodiments, the magnetic steel 20 can be segmented only in the axial direction of the rotor core 10, but not in the radial direction of the rotor core 10. Each magnetic steel 20 can include N first sub-magnetic steel segments 22 arranged in sequence in the axial direction of the rotor core 10, N ≥ 2, which can be understood as the magnetic steel 20 is segmented along the axial direction of the rotor core 10, and the number of segments is at least two; in other embodiments, the magnetic steel 20 can be segmented only in the radial direction of the rotor core 10. The rotor core 10 is segmented, but not segmented in the axial direction of the rotor core 10. Each magnetic steel 20 may include M second sub-magnetic steel segments 24 arranged in sequence in the radial direction of the rotor core 10, M≥2, which can be understood as the magnetic steel 20 is segmented in the radial direction of the rotor core 10, and the number of segments is at least two; in some other embodiments, the magnetic steel 20 can be configured to be segmented in both the axial and radial directions of the rotor core 10, and each magnetic steel 20 is composed of a plurality of second sub-magnetic steel segments 24 and a plurality of first sub-magnetic steel segments 22. The magnetic steel 20 is segmented in the axial and radial directions of the rotor core 10, and the change in magnetic flux of each sub-magnetic steel segment is smaller than that of the entire magnetic steel 20 when it is not segmented, so that the change in magnetic field is reduced, the magnetic field distribution is more uniform, and the size of eddy current can be reduced. Moreover, after the magnetic steel 20 is configured to be composed of a plurality of sub-magnetic steel segments, the size of a single sub-magnetic steel segment in the axial and radial directions is relatively small, and the flow path of eddy current therein is correspondingly shortened, thereby reducing the heat and loss generated by eddy current.

[0047] The number N of the first sub-magnetic steel segments 22 is ≥ 2. For example, the number of the first sub-magnetic steel segments 22 can be 3, 4, or 5. Figure 4 As shown, when the number of the first sub-magnetic steel segments 22 is 2, the motor efficiency can be improved by more than 15%; when the number of the first sub-magnetic steel segments 22 is 3, the motor efficiency can be improved by more than 25%; when the number of the first sub-magnetic steel segments 22 is 4, the motor efficiency can be improved by more than 30%; when the number of the first sub-magnetic steel segments 22 is 5, the motor efficiency can be improved by more than 35%. The motor efficiency can be significantly improved by axial segmentation of the magnetic steel 20; the number M of the second sub-magnetic steel segments 24 is ≥ 2. By way of example, the number of the second sub-magnetic steel segments 24 can be constructed to be 3, 4 or 5, etc. Similarly, the motor efficiency can be significantly improved by radial segmentation of the magnetic steel 20.

[0048] It should be pointed out that the axial length Lef of the N first sub-magnetic steel segments 22 and the axial size L of the rotor core 10 satisfy N=L / Lef, and the axial size L of the rotor core 10 can refer to the total length of the magnetic steel 20 in the axial direction of the rotor core 10, so that the magnetic steel 20 is evenly divided into N equal-length first sub-magnetic steel segments 22 in the axial direction of the rotor core 10, which can ensure that the magnetic steel 20 is reasonably segmented in the axial direction of the rotor core 10, so as to effectively improve the magnetic field distribution inside the magnetic steel 20, improve the magnetic field uniformity, and thus reduce eddy current loss; similarly, the radial length bm1 of the M second sub-magnetic steel segments 24 and the radial length bm of the magnetic steel 20 satisfy M=bm / bm1, and the magnetic steel 20 is evenly divided into M equal-length second sub-magnetic steel segments 24 in the radial direction of the rotor core 10, so as to ensure that the magnetic steel 20 is reasonably segmented in the radial direction of the rotor core 10, so as to effectively improve the magnetic field distribution inside the magnetic steel 20, improve the magnetic field uniformity, and thus reduce eddy current loss. In addition, the uniform segmentation can also make the processing and installation of the magnetic steel 20 more flexible and convenient. For example, standardized sub-magnetic steel segments can be used for assembly, which simplifies the production process, improves production efficiency and saves production costs.

[0049] According to the rotor assembly 100 of the present application, the magnet 20 can be divided into multiple sub-magnetic steel segments in the axial and radial directions of the rotor core 10 to shorten the length of each sub-magnetic steel segment in the direction of magnetic field change, thereby reducing the eddy current loop area and eddy current size, reducing the heat and loss generated by the eddy current, and thus effectively improving the operating efficiency and reliability of the motor.

[0050] like Figure 1 and Figure 3 As shown, according to some embodiments of the present application, the size of the magnetic steel 20 in the magnetization direction is hm, and satisfies .

[0051] Specifically, by setting the ratio between the dimension hm of the magnetic steel 20 in the magnetization direction, the radial length bm of the magnetic steel 20, and the axial length Lef of the first sub-magnetic steel segment 22 within the above range, the shapes and sizes of the multiple first sub-magnetic steel segments 22 are reasonable, and the electromagnetic performance of the motor can be optimized, such as improving the electromagnetic torque, reducing the iron loss, etc., thereby improving the overall efficiency of the motor. Moreover, under the premise of meeting the performance requirements, by accurately controlling the ratio between hm, bm and Lef, the relationship between manufacturing cost and performance can be balanced. For example, if the hm value among hm, bm and Lef is relatively small, it may increase the difficulty and cost of processing, while a relatively large hm value may be unfavorable for reducing eddy current losses. Therefore, in the embodiment of the present application, by setting the size relationship between the dimension hm of the magnetic steel 20 in the magnetization direction, the radial length bm of the magnetic steel 20, and the axial length Lef of each first sub-magnetic steel segment 22 within the above range, illustratively, The value can be 0.19, 0.3, 0.4, 0.5, 0.6 or 0.7, etc. In this way, it is possible to limit the reasonable axial segment size of the magnetic steel 20, maximize manufacturability, and not increase the cost too much, thereby achieving the purpose of minimizing eddy current losses and effectively improving motor efficiency.

[0052] It can be understood that in practical applications, the specific values ​​of the dimension hm of the magnetic steel 20 in the magnetization direction, the radial length bm of the magnetic steel 20, and the axial length Lef of each first sub-magnetic steel segment 22 can be determined after comprehensive consideration based on the specific performance requirements of the motor (such as efficiency, power density, torque, etc.) and manufacturing cost and other factors. The proportional relationship between hm, bm and Lef defined in the embodiment of the present application can be used as a constraint condition in the design process to help find the best balance point between multiple design parameters.

[0053] In addition, if Figure 4 As shown, the axial segmentation of the magnetic steel 20 has a significant effect on improving the motor efficiency. When the number of axial segments of the magnetic steel 20 is two, the motor efficiency can be improved by more than 15%. After a certain number of axial segments of the magnetic steel 20, the effect of improving the motor efficiency tends to be flat. Limiting the range of the proportional relationship between various parameters and reasonably setting the number of segments of the magnetic steel 20 are beneficial to optimizing performance while saving manufacturing costs.

[0054] like Figure 3 As shown, according to some embodiments of the present application, the axial lengths of the plurality of first sub-magnetic steel segments 22 are different.

[0055] Specifically, the segmentation of the magnetic steel 20 in the axial direction of the rotor core 10 can be constructed as uneven segmentation, and the axial lengths of at least two first sub-magnetic steel segments 22 in the plurality of first sub-magnetic steel segments 22 are different. For example, the number of first sub-magnetic steel segments 22 can be configured as three, wherein the axial lengths of two first sub-magnetic steel segments 22 are different, and the axial length of the third first sub-magnetic steel segment 22 can be the same as or different from the axial lengths of the other first sub-magnetic steel segments 22. By setting the axial lengths of the plurality of first sub-magnetic steel segments 22 to be different, it is also possible to optimize the eddy current path, effectively reduce the eddy current loss, improve the motor efficiency, and help save production costs. At the same time, the uneven axial length distribution of the first sub-magnetic steel segments 22 also helps reduce the mechanical resonance of the motor, and can improve the noise and vibration levels. In addition, by changing the axial length of the first sub-magnetic steel segment 22 at different positions, the magnetic flux density of the rotor assembly 100 at different positions can also be adjusted, so as to more accurately control the distribution of the magnetic field. For example, in an area where a higher magnetic field strength is required, a first sub-magnetic steel segment 22 with a relatively short axial length can be used, while in an area where a lower magnetic field strength is required, a relatively long first sub-magnetic steel segment 22 can be used. This helps to improve the flexibility and adaptability of the rotor assembly 100 for motors of different performances, especially for application scenarios that require special magnetic field distribution, such as some high-performance motors or special-purpose generators.

[0056] It should be noted that one or some of the multiple magnetic steels 20 can be constructed to be segmented in the axial direction of the rotor core 10, and all of the multiple magnetic steels 20 can be constructed to be segmented in the axial direction of the rotor core 10. The axial lengths of different first sub-magnetic steel segments 22 in different magnetic steels 20 can be the same or different, so as to provide greater flexibility and optimization space for the design of the rotor assembly 100, which is not limited in the embodiments of the present application.

[0057] like Figure 1 and Figure 2 As shown, according to some embodiments of the present application, the size of the magnetic steel 20 in the magnetization direction is hm, and satisfies .

[0058] Specifically, by setting the ratio between the dimension hm of the magnetic steel 20 in the magnetization direction, the radial length bm1 of the second sub-magnetic steel segment 24, and the axial dimension L of the rotor core 10 within the above range, the shapes and sizes of the multiple second sub-magnetic steel segments 24 are reasonable, and the electromagnetic performance of the motor can be optimized, such as improving the electromagnetic torque, reducing the iron loss, etc., thereby improving the overall efficiency of the motor. Moreover, under the premise of meeting the performance requirements, by accurately controlling the ratio between hm, bm1 and L, the relationship between manufacturing cost and performance can be balanced. For example, if the hm value among hm, bm and L is relatively small, it may increase the difficulty and cost of processing, while a relatively large hm value may be unfavorable for reducing eddy current losses. Therefore, in the embodiment of the present application, by setting the size relationship between the dimension hm of the magnetic steel 20 in the magnetization direction, the radial length bm1 of the second sub-magnetic steel segment 24, and the axial dimension L of the rotor core 10 within the above range, illustratively, The value can be 0.19, 0.6, 1, 1.4, 1.8 or 2.1, etc. In this way, the radial segment size of the magnetic steel 20 can be limited to be reasonable, and the manufacturability can be maximized without increasing the cost too much, so as to minimize the eddy current loss and effectively improve the motor efficiency.

[0059] Similarly, in practical applications, the specific values ​​of the dimension hm of the magnetic steel 20 in the magnetization direction, the radial length bm1 of the second sub-magnetic steel segment 24, and the axial dimension L of the rotor core 10 can be determined after comprehensive consideration based on the specific performance requirements of the motor (such as efficiency, power density, torque, etc.) and manufacturing cost and other factors. The proportional relationship among hm, bm1 and L defined in the embodiment of the present application can be used as a constraint condition in the design process to help find the best balance point between multiple design parameters.

[0060] like Figure 2 As shown, according to some embodiments of the present application, the radial lengths of the plurality of second sub-magnetic steel segments 24 are different.

[0061] Specifically, the segmentation of the magnetic steel 20 in the radial direction of the rotor core 10 can be constructed as uneven segmentation, and the radial lengths of at least two of the plurality of second sub-magnetic steel segments 24 are different. For example, the number of the second sub-magnetic steel segments 24 can be configured as three, wherein the radial lengths of two second sub-magnetic steel segments 24 are different, and the radial length of the third second sub-magnetic steel segment 24 can be the same as or different from the radial lengths of the other second sub-magnetic steel segments 24. By setting the radial lengths of the plurality of second sub-magnetic steel segments 24 to be different, it is also possible to optimize the eddy current path, effectively reduce the eddy current loss, improve the motor efficiency, and help save production costs. At the same time, the uneven radial length distribution of the second sub-magnetic steel segments 24 also helps reduce the mechanical resonance of the motor, and can improve the noise and vibration levels. In addition, by changing the radial length of the second sub-magnetic steel segment 24 at different positions, the magnetic flux density of the rotor assembly 100 at different positions can also be adjusted, so as to more accurately control the distribution of the magnetic field. For example, in an area where a higher magnetic field strength is required, a second sub-magnetic steel segment 24 with a relatively short radial length can be used, while in an area where a lower magnetic field strength is required, a relatively long second sub-magnetic steel segment 24 can be used. This helps to improve the flexibility and adaptability of the rotor assembly 100 for motors of different performances, especially for application scenarios that require special magnetic field distribution, such as some high-performance motors or special-purpose generators.

[0062] It should be noted that one or some of the multiple magnetic steels 20 can be constructed to be segmented in the radial direction of the rotor core 10, and all of the multiple magnetic steels 20 can also be constructed to be segmented in the radial direction of the rotor core 10, and the radial lengths of different second sub-magnetic steel segments 24 in different magnetic steels 20 can be the same or different, so as to provide greater flexibility and optimization space for the design of the rotor assembly 100, which is not limited in the embodiments of the present application.

[0063] like Figure 1 and Figure 2 As shown, according to some embodiments of the present application, the mounting groove 10a is constructed in any one of a U-shape, a V-shape, a W-shape, and a straight shape.

[0064] Specifically, the mounting groove 10a on the rotor core 10 can be constructed as a U-shaped groove, and the projection shape of the mounting groove 10a in the axial direction of the rotor core 10 is U-shaped. The mounting groove 10a on the rotor core 10 can also be constructed as a V-shaped groove, and the projection shape of the mounting groove 10a in the axial direction of the rotor core 10 is V-shaped. The mounting groove 10a on the rotor core 10 can also be constructed as a W-shaped groove or a straight groove (straight groove), and the projection shape of the mounting groove 10a in the axial direction of the rotor core 10 is correspondingly W-shaped or straight (straight). By constructing the mounting groove 10a into any one of U-shape, V-shape, W-shape, and I-shape, on the first hand, the mounting groove 10a has a reasonable shape, which helps to guide the distribution of the magnetic field and make the magnetic field more evenly distributed inside the rotor assembly 100, thereby reducing the energy waste caused by excessive or weak local magnetic fields, further reducing eddy current losses and iron losses, and further effectively improving the motor efficiency; on the second hand, U-shaped grooves, V-shaped grooves, etc. have good support and positioning properties, and can provide good support and positioning effects, which can ensure that the magnetic steel 20 remains stable during the installation process and is not prone to displacement or falling off, which is beneficial to enhancing the stability and reliability of the rotor assembly 100 structure; on the third hand, different shapes of mounting grooves 10a can adapt to segmented magnetic steels 20 of different shapes and sizes, so that the rotor assembly 100 structure can be flexibly applied to a variety of motor designs, thereby significantly improving the efficiency of a variety of motors.

[0065] like Figure 1-Figure 5 As shown, the motor according to the second aspect of the present application includes: the rotor assembly 100 described in any one of the above embodiments. Since the motor according to the second aspect of the present application includes the rotor assembly 100 described in any one of the above embodiments, the magnetic steel 20 of the rotor assembly 100 in the motor can be divided into a plurality of sub-magnetic steel segments in the axial direction and radial direction of the rotor core 10 to improve the uniformity of the magnetic field distribution, shorten the turbine path, and reduce the turbine loop area, thereby reducing the eddy current loss, and thus effectively improving the efficiency of the motor.

[0066] In addition, in some specific embodiments of the present application, the motor also includes a stator assembly 200, which is sleeved on the outer periphery of the rotor assembly 100. The stator assembly 200 interacts with the rotor assembly 100 to generate a rotating magnetic field, thereby driving the rotor assembly 100 to rotate to realize the operation of the motor.

[0067] like Figure 5 As shown, according to the compressor 1000 of the third aspect embodiment of the present application, the compressor 1000 includes: the motor described in the above embodiment, and the technical effect produced is consistent with that in the above embodiment, which will not be repeated here.

[0068] In addition, in some specific embodiments of the present application, the compressor 1000 further includes: a crankshaft 300, a power unit, a main bearing 400, a cylinder 500, a piston 600, and a secondary bearing 700. Among them, one end of the crankshaft 300 is inserted through the rotor core 10 and connected to the rotor core 10, and the crankshaft 300 is also connected to the power unit, which is configured to drive the crankshaft 300 to rotate. When the power unit is working, it can drive the crankshaft 300 to rotate, and then drive the rotor core 10 to rotate; the main bearing 400, the cylinder 500, and the secondary bearing 700 are all sleeved on the outer periphery of the crankshaft 300, and are successively arranged away from the rotor core 10 in the axial direction of the crankshaft 300. The main bearing 400 and the secondary bearing 700 can be respectively at different positions of the crankshaft 300 to support the crankshaft 300 and reduce the friction and wear during its rotation, which helps to improve the running stability of the compressor 1000. A piston 600 is disposed in the cylinder 500 and is connected to the crankshaft 300. The rotation of the crankshaft 300 can drive the piston 600 to reciprocate in the cylinder 500, thereby ensuring that the compression work of the compressor 1000 is effectively completed and energy consumption is saved.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that: include: A rotor core, wherein a mounting groove is provided on the rotor core; A magnetic steel, wherein the magnetic steel is arranged in the mounting groove and in the axial direction of the rotor core, the magnetic steel comprises N first sub-magnetic steel segments, each of which has an axial length of Lef, an axial dimension of the rotor core of L, and satisfies N=L / Lef, N≥2, and / or In the radial direction of the rotor core, the magnetic steel includes M second sub-magnetic steel segments, each of which has a radial length of bm1, a radial length of bm, and satisfies M=bm / bm1, M≥2; wherein the size of the magnetic steel in the magnetization direction is hm, and satisfies .

2. The rotor assembly according to claim 1, characterized in that: The axial lengths of the plurality of first sub-magnetic steel segments are different.

3. The rotor assembly according to claim 1, characterized in that: The size of the magnetic steel in the magnetization direction is hm, and satisfies .

4. The rotor assembly according to claim 3, characterized in that: The radial lengths of the plurality of second sub-magnetic steel segments are different.

5. The rotor assembly according to any one of claims 1 to 4, characterized in that: The installation groove is constructed in any one of a U-shape, a V-shape, a W-shape, and a straight shape.

6. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 5.

7. A compressor, characterized in that: include: The motor as claimed in claim 6.

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