Rotor, motor and compressor

Abstract

The present application discloses a rotor, a motor and a compressor, belonging to the technical field of motor manufacturing. The rotor includes: a rotor punching sheet, on which a plurality of magnet groove groups are provided, each magnet groove group has at least N magnet grooves, and N is greater than or equal to three; a magnet is arranged in each magnet groove, and each magnet groove group defines a magnetic pole, and a plurality of magnets are symmetrically arranged with respect to the center line of the magnetic pole. Among the plurality of magnets, the magnet closest to the center line has the largest intrinsic coercivity. According to the rotor of the present application, high-intrinsic coercivity magnets are used in the region closest to the center line of the magnetic pole where demagnetization is likely to occur, while low-intrinsic coercivity magnets are appropriately arranged in other regions, which can effectively improve the demagnetization rate of the magnets and improve the stability of the overall magnetic performance, while controlling the material cost, thereby improving the working performance and operation stability of the rotor and saving economic costs.

Description

Technical Field

[0001] This application relates to the technical field of motor manufacturing, and in particular to a rotor, 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 the 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 permanent magnet acts as a key component, playing the role of transmitting and converting electromagnetic energy. However, in related technologies, under high load, long-term operation, or extreme working conditions, the motor often has problems such as an increased demagnetization rate of the permanent magnet and serious magnetic leakage. These problems not only lead to a decrease in the operating efficiency, stability, and reliability of the motor, but also increase energy consumption and maintenance costs, severely restricting the application effect of the motor in key fields such as compressors and refrigeration equipment. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of this application is to propose a rotor. The rotor uses a high-intrinsic coercivity permanent magnet in the region closest to the pole center line where demagnetization is likely to occur, and appropriately arranges low-intrinsic coercivity permanent magnets in other regions. It can effectively improve the demagnetization rate of the permanent magnet, improve the stability of the overall magnetic performance, control the material cost, thereby improving the working performance and operation stability of the rotor, and saving economic costs.

[0004] This application also proposes a motor having the above rotor.

[0005] This application also proposes a compressor having the above motor.

[0006] According to the rotor of the first aspect embodiment of this application, the rotor includes: a rotor punching sheet, on which a plurality of permanent magnet slot groups are provided, and each permanent magnet slot group has at least N permanent magnet slots, where N is greater than or equal to three; a permanent magnet is disposed in each permanent magnet slot, and each permanent magnet slot group defines a magnetic pole, and a plurality of permanent magnets are symmetrically arranged with respect to the center line of the magnetic pole. Among the plurality of permanent magnets, the permanent magnet closest to the center line has the largest intrinsic coercivity.

[0007] According to the rotor of the present application, by precisely arranging permanent magnets with different intrinsic coercivities, high-intrinsic coercivity permanent magnets are used in the region closest to the midline of the magnetic poles where demagnetization is likely to occur, while low-intrinsic coercivity permanent magnets are appropriately arranged in other regions. This can effectively improve the demagnetization rate of the permanent magnets, enhance the stability of the overall magnetic performance, save material costs, thereby improving the working performance and running stability of the rotor, increasing the working efficiency and reliability of the motor, and saving economic costs.

[0008] According to some embodiments of the present application, in the direction away from the midline, the intrinsic coercivities of the plurality of permanent magnets decrease in sequence.

[0009] In some embodiments, the magnetic materials of the plurality of permanent magnets are different, and among the plurality of permanent magnets, the remanence of the permanent magnet closest to the midline is the largest.

[0010] Further, in the direction away from the midline, the remanences of the plurality of permanent magnets decrease in sequence.

[0011] According to some embodiments of the present application, the plurality of permanent magnets include a first permanent magnet and second to Mth permanent magnets symmetrically arranged relative to the first permanent magnet, and 2M = N or 2M - 1 = N is satisfied. The extending directions of the second to Mth permanent magnets have non-right-angle angles with the midline.

[0012] Further, the sizes of the plurality of permanent magnets are the same.

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

[0015] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood 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 be easily understood from the description of the embodiments in conjunction with the following drawings, where:

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

[0018] Figure 2 is a magnetic cloud diagram of permanent magnet demagnetization according to an embodiment of the present application;

[0019] Figure 3 is a magnetic cloud diagram of permanent magnet demagnetization in the related art;

[0020] Figure 4 It is a comparison chart of the motor efficiency between different remanent magnet steels combinations in the embodiments of the present application and the magnet steel combinations in the related art;

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

[0022] Reference numerals:

[0023] 100, compressor;

[0024] 10, rotor;

[0025] 12, rotor punching sheet;

[0026] 13, magnet steel groove group; 13a, magnet steel groove;

[0027] 14, magnet steel; 14a, first magnet steel; 14b, second magnet steel;

[0028] 20, stator;

[0029] 30, housing;

[0030] 40, crankshaft;

[0031] 50, main bearing;

[0032] 60, cylinder;

[0033] 70, piston;

[0034] 80, auxiliary bearing. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above accompanying drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0037] Reference to "embodiment" in this application means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0038] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] The term "and / or" in this application is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0040] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0041] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0042] In the description of this application, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features between them.

[0043] In the description of the present application, "above", "over", and "on top of" a second feature by a first feature include the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature.

[0044] In the present application, "a plurality of" means two or more (including two).

[0045] Reference is made below Figures 1 - 5 to describe the rotor 10, the electric motor, and the compressor 100 according to embodiments of the present application.

[0046] As Figure 1 shown, the rotor 10 according to the first aspect embodiment of the present application includes: a rotor punching sheet 12, on which a plurality of magnet groove groups 13 are provided, and each magnet groove group 13 has at least N magnet grooves 13a, where N is greater than or equal to three.

[0047] Among them, a magnet 14 is provided in each magnet groove 13a, and each magnet groove group 13 defines a magnetic pole. A plurality of magnets 14 are symmetrically arranged with respect to the midline of the magnetic pole. Among the plurality of magnets 14, the magnet 14 closest to the midline has the largest intrinsic coercivity.

[0048] Specifically, the rotor punching sheet 12 can be configured as a plurality of sheets, and the plurality of rotor punching sheets 12 can be stacked and combined to form a rotor core for supporting components such as rotor windings to provide a magnetic flux path. The magnet grooves 13a are provided on the rotor punching sheet 12, and the magnet grooves 13a can provide an installation position for the magnets 14 to realize the installation and fixation of the magnets 14 on the rotor 10. The magnet grooves 13a on the rotor punching sheet 12 are configured as a plurality, and these magnet grooves 13a can be regularly arranged and divided into a plurality of magnet groove groups 13 (such as in a V shape, a U shape, a W shape, etc.). Each magnet groove group 13 has three or more magnet grooves 13a, and a magnet 14 is provided in each magnet groove 13a, that is, one magnet groove 13a provides an installation position for one magnet 14. Thus, the number of magnets 14 provided in each magnet groove group 13 is three or more, which is beneficial to improving the adaptability of the magnets 14 to the requirements of complex magnetic field layouts and ensuring good magnetic flux.

[0049] Each permanent magnet slot group 13 defines a magnetic pole, and multiple permanent magnets 14 within each permanent magnet slot group 13 are symmetrically arranged with respect to the midline of the magnetic pole. This symmetrical arrangement helps to improve the uniformity of the magnetic field distribution, ensure good magnetic flux, and thus improve the operating efficiency and stability of the motor. Among them, the intrinsic coercivity of the permanent magnet 14 closest to the midline is set to be the largest. Here, the permanent magnet 14 closest to the midline can be the permanent magnet 14 located on the midline, or the permanent magnet 14 with the closest relative position to the midline among multiple permanent magnets 14. Exemplarily, multiple permanent magnets 14 within each permanent magnet slot group 13 may include one or more intermediate permanent magnets symmetrically arranged with respect to the midline of the magnetic pole, and multiple lateral permanent magnets arranged on both sides of the intermediate permanent magnets and symmetrically arranged with respect to the midline of the magnetic pole. Then, the intrinsic coercivity of the intermediate permanent magnets is configured to be the largest, and the intrinsic coercivities of the multiple lateral permanent magnets are all less than the intrinsic coercivity of the intermediate permanent magnets.

[0050] It should be noted that in the related art, during the operation of the motor, as the rotor 10 rotates, the magnetic induction lines (usually from the excitation winding of the motor stator 20) enter the permanent magnet 14 in the rotor 10. The direction of the magnetic induction lines is almost perpendicular to the permanent magnet 14 closest to the midline. The magnetic induction lines act perpendicularly on the permanent magnet 14, and its demagnetization component reaches the maximum, which easily causes changes in the magnetic domain structure inside the permanent magnet 14, thereby reducing the magnetic properties of the permanent magnet 14. At the same time, due to the special structure in the area near the magnetic pole midline, it often becomes a place where the magnetic flux density is relatively concentrated. When the magnetic induction lines perpendicularly enter the permanent magnets 14 in these areas, the increase in the magnetic flux density will further exacerbate the demagnetization effect.

[0051] In the embodiment of the present application, the intrinsic coercivity of the permanent magnet 14 closest to the magnetic pole midline is set to be the largest. Here, the intrinsic coercivity refers to the ability of the permanent magnet 14 material to resist the demagnetizing effect of the external magnetic field and maintain its magnetization state. The larger the intrinsic coercivity value, the stronger the ability of the material to resist demagnetization. Therefore, setting the intrinsic coercivity of the permanent magnet 14 closest to the magnetic pole midline to be the largest, that is, using a permanent magnet 14 with a high intrinsic coercivity in the area where demagnetization is most likely to occur, can enhance the demagnetization resistance ability of the permanent magnet 14 in this area, effectively improve the demagnetization rate of this area, and improve the overall magnetic performance stability of the rotor 10. Among them, the demagnetization rate is a parameter describing the magnetic decay characteristics of magnetic materials, referring to the ratio of the magnetic field strength decay with the reverse magnetic field strength, and is a measure of the degree of magnetic loss of the permanent magnet 14. It can be understood that the demagnetization rate reflects the ratio of the magnetization intensity of the permanent magnet 14 decaying with the reverse magnetic field strength under specific conditions.

[0052] In some embodiments, such as Figure 2 and Figure 3 shown, compared with the related art, for the rotor 10 according to the embodiment of the present application, by setting the intrinsic coercivity of the permanent magnet 14 closest to the magnetic pole midline among multiple permanent magnets 14 to be the largest, it is possible to improve the demagnetization rate of the rotor 10 by 0.8% - 1.2%.

[0053] According to the rotor 10 of the present application, by precisely arranging the permanent magnets 14 with different intrinsic coercivities, high-intrinsic-coercivity permanent magnets 14 are used in the area closest to the pole midline where demagnetization is likely to occur, while low-intrinsic-coercivity permanent magnets 14 are appropriately arranged in other areas. It is possible to effectively improve the demagnetization rate of the permanent magnets 14, enhance the stability of the overall magnetic performance, save material costs, thereby improving the working performance and running stability of the rotor 10, increasing the working efficiency and reliability of the motor, and saving economic costs.

[0054] As Figure 1 shown, according to some embodiments of the present application, in the direction away from the midline, the intrinsic coercivities of the multiple permanent magnets 14 decrease in sequence.

[0055] Specifically, the magnitude relationship of the intrinsic coercivities of the multiple permanent magnets 14 arranged in each permanent magnet slot group 13 is constructed such that in the direction away from the pole midline, the intrinsic coercivities of the multiple permanent magnets 14 decrease in sequence. Exemplarily, each permanent magnet slot group 13 has five permanent magnet slots 13a, and five permanent magnets 14 are correspondingly arranged, specifically one middle permanent magnet and four lateral permanent magnets. The four lateral permanent magnets are symmetrically arranged in pairs with respect to the pole midline. Then, the intrinsic coercivity of the middle permanent magnet is constructed to be the largest, the intrinsic coercivities of the two lateral permanent magnets adjacent to the middle permanent magnet are the next, and the two lateral permanent magnets at the ends separated from the middle permanent magnet by one lateral permanent magnet are the farthest from the pole midline and have the smallest intrinsic coercivity.

[0056] It can be understood that the area near the pole midline is a demagnetization-sensitive area, and permanent magnets 14 with higher intrinsic coercivities are required to resist demagnetization. In the area away from the pole midline, the demagnetization risk is relatively low, and permanent magnets 14 with relatively low intrinsic coercivities can be used. In the embodiments of the present application, by setting the intrinsic coercivities of the multiple permanent magnets 14 to decrease in sequence in the direction away from the pole midline, it is possible to ensure sufficient demagnetization resistance performance, optimize the magnetic circuit of the rotor 10, and maximize the cost-effectiveness.

[0057] In addition, in some specific embodiments of the present application, when the number of permanent magnet slots 13a in each permanent magnet slot group 13 is relatively small, for example, each permanent magnet slot group 13 has three permanent magnet slots 13a, and three permanent magnets 14 are correspondingly arranged, including one middle permanent magnet and two lateral permanent magnets respectively arranged on both sides of the middle permanent magnet. In this case, the magnitude of the intrinsic coercivities of the three permanent magnets 14 can be constructed such that the intrinsic coercivity of the middle permanent magnet is the largest, and the intrinsic coercivity of one of the lateral permanent magnets is less than that of the other lateral permanent magnet, so as to further optimize the cost-effectiveness on the premise of improving the demagnetization rate.

[0058] As Figure 1As shown, according to some embodiments of the present application, the magnetic materials of the plurality of permanent magnets 14 are different, and among the plurality of permanent magnets 14, the remanence of the permanent magnet 14 closest to the center line is the largest.

[0059] Specifically, the plurality of permanent magnets 14 provided in each permanent magnet slot group 13 can adopt different magnetic materials, such as ferrite, neodymium iron boron, samarium cobalt, etc. By selecting a variety of magnetic materials with different magnetic performance parameters to manufacture the permanent magnets 14, the design of the permanent magnets 14 can be carried out according to the requirements of different positions and working environments in the rotor 10, improving the design flexibility of the permanent magnets 14 and helping to optimize the magnetic field distribution in the rotor 10. Different magnetic materials can have different remanence characteristics. Among them, the remanence structure of the permanent magnet 14 closest to the magnetic pole center line among the plurality of permanent magnets 14 is the largest. Here, the remanence refers to the magnetization intensity that remains in the magnetic material after magnetization and removal of the external magnetic field. The larger the remanence value, the stronger the ability of the magnetic material to store magnetic energy, and a relatively strong permanent magnetic field can be generated, which helps to ensure that more magnetic flux is retained after magnetization. In the related art, the area near the magnetic pole center line is the area where the magnetic field is most concentrated and prone to magnetic leakage. In the embodiments of the present application, by making the remanence of the permanent magnet 14 closest to the magnetic pole center line the largest, the magnetic flux in the area near the magnetic pole center line can be increased without increasing the total volume of the permanent magnets 14, enhancing the magnetic field strength in this area, thereby enhancing the stability and output ability of the magnetic field, and further reducing magnetic leakage and improving the motor efficiency.

[0060] In addition, by adopting the method that the magnetic materials of the plurality of permanent magnets 14 are different and the remanence of the permanent magnet 14 closest to the magnetic pole center line is the largest, the remanence distribution and layout of the permanent magnets 14 are optimized, and each permanent magnet 14 can also exert its maximum magnetic performance at its location, avoiding waste of magnetic energy and overuse of permanent magnet 14 materials, achieving improved utilization rate of the permanent magnets 14. In this way, it helps to save the manufacturing cost of the rotor 10 and improve its economy and reliability during long-term operation.

[0061] In addition, in some specific embodiments of the present application, the plurality of permanent magnets 14 can also adopt the same magnetic material to reduce costs. Specifically, in some occasions where the demagnetization requirements are not high, the magnetic materials of the plurality of permanent magnets 14 can be made the same. For the same magnetic material, different remanences can be achieved by adopting different magnetization treatments, heat treatments, magnetic field demagnetization or surface coatings, etc., so as to also meet the differential setting of the remanences of the plurality of permanent magnets 14.

[0062] In some embodiments, as Figure 4 shown, compared with the related art, for the rotor 10 according to the embodiments of the present application, by setting the remanence of the permanent magnet 14 closest to the magnetic pole center line among the plurality of permanent magnets 14 to be the largest, the motor efficiency can be increased by 0.1% - 0.2%.

[0063] As shown Figure 1 in FIG. Figure 1 , according to some embodiments of the present application, in a direction away from the center line, the remanent magnetism of multiple permanent magnets 14 decreases successively.

[0064] Specifically, the magnitude relationship of the remanent magnetism of the multiple permanent magnets 14 arranged in each permanent magnet slot group 13 is configured such that in a direction away from the pole center line, the remanent magnetism of the multiple permanent magnets 14 decreases successively. Exemplarily, each permanent magnet slot group 13 has five permanent magnet slots 13a, and five permanent magnets 14 are correspondingly arranged, specifically one middle permanent magnet and four lateral permanent magnets. The four lateral permanent magnets are symmetrically arranged in pairs with respect to the pole center line. Then, the remanent magnetism of the middle permanent magnet is configured to be the largest, the remanent magnetism of the two lateral permanent magnets adjacent to the middle permanent magnet is the next largest, and the two lateral permanent magnets at the ends that are separated from the middle permanent magnet by one lateral permanent magnet are the farthest from the pole center line and have the smallest remanent magnetism.

[0065] By setting that in a direction away from the pole center line, the remanent magnetism of the multiple permanent magnets 14 decreases successively, on the one hand, the remanent magnetism of the multiple permanent magnets 14 gradually decreases in a gradient manner from the pole center line to both sides, which helps to balance the magnetic field intensity inside the rotor 10, can reduce magnetic leakage and energy loss caused by overly concentrated magnetic fields. At the same time, it can also ensure that during the operation of the motor, magnetic energy can be converted and utilized more efficiently and uniformly; on the other hand, the gradient distribution of the remanent magnetism of the multiple permanent magnets 14 helps to guide the magnetic field to pass through the rotor punching sheet 12 more smoothly, and can reduce eddy current loss and iron loss caused by magnetic field mutation or uneven distribution. The reduction of these losses directly improves the energy conversion efficiency of the motor, so that the motor can output more useful work under the same input conditions, effectively improving the motor efficiency; on the third hand, the remanent magnetism of the multiple permanent magnets 14 decreases successively, realizing the targeted increase of the magnetic flux in different regions without increasing the total volume of the permanent magnets 14, so as to improve the stability and output ability of the overall magnetic field, effectively improving the utilization rate of the permanent magnets 14 and saving economic costs.

[0066] As shown Figure 1 in FIG. Figure 1 , according to some embodiments of the present application, the multiple permanent magnets 14 include a first permanent magnet 14a and second permanent magnets 14b to Mth permanent magnets symmetrically arranged relative to the first permanent magnet 14a, and satisfy 2M = N, or 2M - 1 = N. The extending directions of the second permanent magnets 14b to Mth permanent magnets have a non-right angle with the center line.

[0067] Specifically, the multiple magnets 14 provided in each magnet groove group 13 include a first magnet 14a, a second magnet 14b... an Mth magnet. The first magnet 14a is the magnet 14 closest to the magnetic pole center line. The second magnet 14b to the Mth magnet are symmetrically arranged relative to the first magnet 14a. The number of the first magnet 14a, the second magnet 14b... the Mth magnet may be the same or different, and the embodiments of the present application do not limit this. For example, in some embodiments, the number of the first magnet 14a, the second magnet 14b... the Mth magnet may all be configured as two or three, etc. In other embodiments, the number of the first magnet 14a is configured as one, while the number of the second magnet 14b... the Mth magnet may all be configured as two or three, etc. According to different performance requirements of the rotor 10, the setting of the number of the first magnet 14a, the second magnet 14b to the Mth magnet may be different to improve the adaptability and flexibility of the magnet 14 applied to the rotor 10.

[0068] It should be noted that the relationship between the number M of the above different magnets 14 and the number N of the at least magnet grooves 13a in each magnet groove group 13 needs to satisfy 2M = N or 2M - 1 = N. Exemplarily, when the number N of the at least magnet grooves 13a in each magnet groove group 13 is configured as 3, and the multiple magnets 14 include a first magnet 14a, a second magnet 14b, and a third magnet 14, under the condition of satisfying 2M = N, each magnet groove group 13 may have six magnet grooves 13a, and the number of the first magnet 14a, the second magnet 14b, and the third magnet 14 are all configured as two. Under the condition of satisfying 2M - 1 = N, each magnet groove group 13 may have five magnet grooves 13a, the number of the first magnet 14a is configured as one, and the number of the second magnet 14b and the third magnet 14 are both configured as two. By setting the number M of the different magnets 14 and the number N of the at least magnet grooves 13a in each magnet groove group 13 to satisfy 2M = N or 2M - 1 = N, it helps to ensure the symmetry of the magnet 14, improve the uniformity of the magnetic field distribution to improve the motor efficiency, and at the same time helps to simplify the arrangement and assembly process of the magnet 14, and is conducive to realizing specific magnetic field distribution and performance requirements.

[0069] Wherein, the extending direction of the above second magnet 14b to the Mth magnet has a non - right - angle included angle with the center line. In this way, on the one hand, it can achieve fine control of the magnetic field distribution, which helps to generate a more uniform and stable magnetic field inside the rotor 10, and at the same time helps to reduce magnetic leakage and energy loss, improving the motor efficiency and performance; on the other hand, it enables the magnetic field to form a complex and rich distribution inside the rotor 10, which helps to enhance the dynamic response ability of the motor and the ability to adapt to different working conditions.

[0070] In addition, in some specific embodiments of the present application, M is configured as 2, N is configured as 3, each magnet slot group 13 has three magnet slots 13a, and the multiple magnets 14 arranged in the three magnet slots 13a include a first magnet 14a and a second magnet 14b. The number of the first magnets 14a is one, and the second magnets 14b are two symmetrically arranged relative to the first magnet 14a. The first magnet 14a and the second magnets 14b can be arranged in a "U" shape together; in some other specific embodiments of the present application, M is configured as 2, N is configured as 4, each magnet slot group 13 has four magnet slots 13a, and the multiple magnets 14 arranged in the four magnet slots 13a include a first magnet 14a and a second magnet 14b. The number of the first magnets 14a is two, and the second magnets 14b are two symmetrically arranged relative to the two first magnets 14a. There can be a certain included angle between the two first magnets 14a. The two first magnets 14a in the middle and the two second magnets 14b on both sides can be arranged in a "W" shape together. When the first magnet 14a and the second magnets 14b are arranged in a "U" shape or a "W" shape together, by setting the intrinsic coercivity and remanence of the first magnet 14a to be the largest, the demagnetization rate can be improved correspondingly, the magnetic leakage can be reduced, and the utilization rate of the magnet 14 can be increased, so as to optimize the performance, efficiency, and reliability of the motor.

[0071] As Figure 1 shown, according to some embodiments of the present application, the multiple magnets 14 have the same size.

[0072] Specifically, the multiple magnets 14 are configured to have the same size. The multiple magnets 14 can be consistent in dimensions such as length, width, and height. By adopting the form of unified sizes of the multiple magnets 14, the manufacturing process of the magnets 14 can be simplified, the production efficiency can be improved, the production cost can be saved, and the assembly and positioning of the magnets 14 in the rotor 10 are also facilitated. Moreover, since the multiple magnets 14 have the same size, the size variable as a factor affecting the magnetic field distribution is eliminated, thereby simplifying the process of magnetic field analysis and optimization. Furthermore, the accuracy of controlling the magnetic field strength can be improved by adjusting the intrinsic coercivity and remanence of different magnets 14. In this way, the magnetic field strength in specific regions such as the middle line position of adjacent magnetic poles can be accurately enhanced to improve the demagnetization rate and magnetic leakage phenomenon, etc. At the same time, an appropriate magnetic field strength is maintained in other regions far from the middle line position of the magnetic poles, etc., so as to control the cost.

[0073] As Figures 1 - 4As shown, the motor according to the embodiment of the second aspect of the present application includes the rotor 10 described in any one of the above embodiments. Since the motor according to the embodiment of the second aspect of the present application includes the rotor 10 described in any one of the above embodiments, in this motor, by precisely arranging the permanent magnets 14 with different intrinsic coercivities and different remanences, the demagnetization rate of the permanent magnets 14 can be effectively improved, the overall magnetic performance stability of the rotor 10 can be enhanced, magnetic leakage can be improved, and the utilization rate of the permanent magnets 14 can be increased. As a result, the operating stability, reliability, and energy efficiency of the motor can be improved, and economic costs can be saved.

[0074] As Figure 5 As shown, the compressor 100 according to the embodiment of the third aspect of the present application includes the motor described in any one of the above embodiments, and the technical effects generated are the same as those in the above embodiments, which will not be elaborated here.

[0075] In addition, in some specific embodiments of the present application, the compressor 100 further includes a housing 30, a crankshaft 40, a power unit, a main bearing 50, a cylinder 60, a piston 70, and a sub-bearing 80. The housing 30 is disposed outside the stator 20 and the rotor 10, and can play a good role in fixing and protecting the stator 20, the rotor 10, the crankshaft 40, and other components inside the compressor 100. One end of the crankshaft 40 passes through the rotor 10 and is connected to the rotor 10. The crankshaft 40 is also connected to the power unit, and the power unit is configured to drive the crankshaft 40 to rotate. When the power unit operates, it can drive the crankshaft 40 to rotate, and then drive the rotor 10 to rotate. The main bearing 50, the cylinder 60, and the sub-bearing 80 are all sleeved on the outer circumference of the crankshaft 40 and are sequentially arranged away from the rotor 10 in the axial direction of the crankshaft 40. The main bearing 50 and the sub-bearing 80 can support the crankshaft 40 at different positions of the crankshaft 40 and reduce the friction and wear during its rotation, which helps to improve the running smoothness of the compressor 100. A piston 70 is disposed inside the cylinder 60, and the piston 70 is connected to the crankshaft 40. The rotational movement of the crankshaft 40 can drive the piston 70 to reciprocate inside the cylinder 60, thereby ensuring the effective completion of the compression work of the compressor 100 and saving energy consumption.

[0076] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0077] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor, characterized in that: include: A rotor punching (12), wherein a plurality of magnetic steel slot groups (13) are provided on the rotor punching (12), each magnetic steel slot group (13) having at least N magnetic steel slots (13a), where N is greater than three; A magnetic steel (14) is arranged in each magnetic steel slot (13a), and each magnetic steel slot group (13) defines a magnetic pole, and the plurality of magnetic steels (14) are symmetrically arranged about a center line of the magnetic pole, and among the plurality of magnetic steels (14), the magnetic steel (14) closest to the center line has the largest intrinsic coercive force, and in a direction away from the center line, the intrinsic coercive forces of the plurality of magnetic steels (14) decrease in sequence; in The plurality of magnetic steels include a first magnetic steel (14a) and second magnetic steels (14b) to Mth magnetic steels symmetrically arranged relative to the first magnetic steel (14a), and satisfy 2M=N, or 2M-1=N. The magnetic materials of the plurality of magnetic steels (14) are different, and among the plurality of magnetic steels (14), the magnetic steel (14) closest to the center line has the largest residual magnetism, and the residual magnetism of the plurality of magnetic steels (14) decreases in sequence.

2. The rotor according to claim 1, characterized in that The extension direction of the second magnetic steel (14b) to the Mth magnetic steel has a non-right angle with the midline.

3. The rotor according to claim 2, characterized in that The multiple magnetic steels (14) have the same size.

4. A motor, characterized in that: include: A rotor as claimed in any one of claims 1 to 3.

5. A compressor, characterized in that: include: The motor according to any one of claims 4.

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