Rotor assembly and motor

Abstract

The invention provides a rotor assembly and a motor, the rotor assembly is used for the motor, and the rotor assembly is arranged in a stator assembly. The rotor assembly comprises a rotor iron core, the outer edge of the rotor iron core is provided with a plurality of rotor tooth parts and a plurality of first rotor connecting parts which are alternately arranged at intervals in the circumferential direction of the rotor iron core, and a containing groove is formed between the adjacent rotor tooth part and first rotor connecting part; the magnetic steel is arranged in the accommodating groove; the magnetizing directions of the two pieces of magnetic steel located on the two sides of the same first rotor connecting part are the same, and the magnetizing directions are tangential. The two magnetic steels and the first rotor connecting part located between the two magnetic steels are arranged between the adjacent rotor tooth parts, and the magnetic resistance of the rotor core is smaller than the magnetic resistance of the magnetic steels, so that the quadrature-axis magnetic resistance of the rotor assembly is reduced, the quadrature-axis inductance of the rotor assembly is improved, the salient pole rate of the rotor assembly is improved, and the magnetic resistance torque of the motor is improved. In this way, the torque density and efficiency of the motor can be improved.

Description

Rotor assembly and motor Technical Field

[0001] This application relates to the field of motor technology, specifically to a rotor assembly and a motor. Background Technology

[0002] Spoke-type rotor motors can effectively concentrate magnetic flux and increase rotor magnetic flux density, thereby improving the output torque and efficiency of the motor. However, compared with traditional built-in rotor motors, the magnets of spoke-type rotor motors are distributed on the rotor q-axis, i.e., the quadrature axis, resulting in a larger q-axis magnetic reluctance, which leads to a lower saliency ratio and smaller magnetic reluctance torque of the motor. Summary of the Invention

[0003] In view of the above problems, this application provides a rotor assembly and a motor to improve the motor torque density and efficiency by providing a first rotor connection between the magnets.

[0004] To solve the above-mentioned technical problems, the technical solution adopted in this application is conceived as follows: This application provides a rotor assembly, which is built into a stator assembly. The rotor assembly includes: a rotor core, the outer edge of which is provided with a plurality of rotor teeth and a plurality of first rotor connecting portions arranged alternately and spaced along the circumference of the rotor core, and a receiving groove is formed between adjacent rotor teeth and first rotor connecting portions; a plurality of magnets, and the receiving groove is provided with magnets; wherein, the magnetization direction of two magnets located on both sides of the same first rotor connecting portion is the same, and the magnetization direction is tangential.

[0005] In some embodiments, the rotor teeth are provided with mounting grooves on both sides in the circumferential direction, and the mounting grooves form corresponding receiving grooves with the adjacent first rotor connecting portions.

[0006] In some embodiments, the receiving groove communicates with the gap between the stator assembly and the rotor assembly such that the magnet is at least partially in contact with the gap.

[0007] In some embodiments, the receiving groove is disposed on the side of the rotor core near the stator assembly along the radial direction of the rotor core, and the receiving groove has an opening communicating with the gap, the opening being near the first rotor connection portion along the circumferential direction.

[0008] In some embodiments, the two magnets located on both sides of the same first rotor connection portion are arranged in parallel.

[0009] In some embodiments, along the tangential direction, the size of the first rotor connection portion is greater than or equal to 1 mm.

[0010] In some embodiments, the rotor core further includes a rotor yoke and a plurality of second rotor connecting portions spaced apart along the circumferential direction. The second rotor connecting portions connect the rotor yoke and the corresponding rotor teeth in the radial direction of the rotor assembly. The first rotor connecting portion is connected to the rotor yoke. In the circumferential direction, the second rotor connecting portion is recessed relative to the corresponding rotor teeth. The second rotor connecting portion is located on the center line of the rotor teeth along the radial direction of the rotor core.

[0011] In some embodiments, the size of the second rotor connection portion along the tangential direction is 0.5 mm to 1.5 mm.

[0012] In some embodiments, along the circumferential direction, the two sides of the magnet are respectively in contact with the corresponding first rotor connection portion and the rotor teeth portion.

[0013] In some embodiments, the magnets located on both sides of the same rotor tooth have opposite magnetization directions.

[0014] In some embodiments, the mounting groove protrudes from the bottom wall of the mounting groove near the end wall of the stator assembly to form rotor pole shoes on the rotor teeth near the end wall of the stator assembly.

[0015] In some embodiments, the rotor assembly further includes a shaft, wherein the rotor core has a central hole and the shaft is disposed in the central hole.

[0016] This application provides an electric motor, including: the rotor assembly described above; and a stator assembly sleeved on the outer periphery of the rotor assembly.

[0017] The advantages of the embodiments proposed in this application, which differ from existing technologies, are as follows: The rotor assembly proposed in this application includes a rotor core and multiple magnets. The outer edge of the rotor core is provided with multiple rotor teeth and multiple first rotor connecting portions arranged alternately and at circumferential intervals, and receiving grooves are formed between adjacent rotor teeth and first rotor connecting portions; the receiving grooves are provided with magnets. In this way, two magnets can be arranged between adjacent rotor teeth and a first rotor connecting portion can be arranged between two magnets. Because the magnetic reluctance of the rotor core is less than that of the magnets, the quadrature-axis magnetic reluctance of the rotor assembly can be reduced, and the quadrature-axis inductance of the rotor assembly can be increased, thereby increasing the saliency ratio of the rotor assembly (this design hardly changes the direct-axis inductance of the rotor), and increasing the reluctance torque of the motor. In this way, this application can improve the torque density and efficiency of the motor. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 is a structural schematic diagram of an embodiment of the rotor assembly of this application; Figure 2 is a structural schematic diagram of an embodiment of the rotor core of this application; Figure 3 is a structural schematic diagram of an embodiment of the motor of this application; Figure 4 is a schematic diagram of the torque simulation results of the motor of this application and a conventional motor.

[0019] In the diagram above: 100-rotor assembly, 200-motor, 1-shaft, 2-rotor core, 21-rotor teeth, 22-receiving slot, 221-opening, 23-mounting slot, 24-center hole, 3-magnet, 4-second rotor connection, 5-first rotor connection, 6-rotor yoke, 7-stator assembly, 29-rotor pole shoe, 291-notch. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] In the description of this application, 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," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] This application proposes a rotor assembly, as shown in Figures 1 to 3. Figure 1 is a structural schematic diagram of an embodiment of the rotor assembly of this application; Figure 2 is a structural schematic diagram of an embodiment of the rotor core of this application; and Figure 3 is a structural schematic diagram of an embodiment of the motor of this application. The rotor assembly 100 is built into the stator assembly 7. The rotor assembly 100 includes: a rotor core 2 and a plurality of magnets 3; wherein, the outer edge of the rotor core 2 is provided with a plurality of rotor teeth 21 and a plurality of first rotor connecting portions 5 arranged alternately and spaced along its circumference, and a receiving groove 22 is formed between adjacent rotor teeth 21 and first rotor connecting portions 5; the receiving groove 22 is provided with magnets 3; wherein, the magnetization direction of two magnets 3 located on both sides of the same first rotor connecting portion 5 is the same, and the magnetization direction is tangential.

[0026] The alternating arrangement of multiple rotor teeth 21 and multiple first rotor connecting parts 5 along the circumference means that, along the circumference, a first rotor connecting part 5 is provided between two adjacent rotor teeth 21, and two rotor teeth 21 are provided between two adjacent first rotor connecting parts 5, and the alternating arrangement of multiple rotor teeth 21 and multiple first rotor connecting parts 5 forms a complete circle.

[0027] The stator assembly 7 is used to generate a magnetic field to provide rotational power to the rotor assembly 100. The rotor assembly 100 is built into the stator assembly 7 to rotate under the drive of the stator assembly 7. The rotor core 2 is used to fix and support multiple magnets 3 and to conduct magnetism to form a magnetic circuit. The magnets 3 are used to generate a magnetic field and interact with the magnetic field generated by the stator assembly 7 to generate torque.

[0028] The rotor teeth 21 are used to guide and concentrate magnetic flux, providing a low magnetic resistance path for the magnetic flux to form a magnetic circuit, and interact with the magnetic field generated by the stator assembly 7 to generate torque. The outer edge of the rotor core 2 is provided with multiple rotor teeth 21 and multiple first rotor connecting parts 5 arranged alternately and spaced along its circumference, and a receiving groove 22 is formed between adjacent rotor teeth 21 and first rotor connecting parts 5. The receiving groove 22 is used to receive, position and support magnets 3. The magnetization directions of the two magnets 3 located on both sides of the same first rotor connecting part 5 are the same and tangential. Tangential means that at the location of the magnet 3, in a plane perpendicular to the radial direction of the rotor core 2, the direction is parallel to the circumference of the rotor core 2. The magnetization directions of the two magnets 3 are the same and tangential so that the polarities of the two adjacent rotor teeth 21 are opposite and the air gap magnetic flux density can be increased.

[0029] By setting two magnets 3 between adjacent rotor teeth 21 and setting a first rotor connecting part 5 between the two magnets 3, the magnetic reluctance of the rotor core 2 is less than that of the magnets 3, which can reduce the quadrature axis magnetic reluctance of the rotor assembly 100, increase the quadrature axis inductance of the rotor assembly 100, thereby increasing the saliency ratio of the rotor assembly 100 (this design hardly changes the direct axis inductance of the rotor), increasing the reluctance torque of the motor 200, and increasing the torque density and efficiency of the motor 200.

[0030] In this embodiment, the quadrature axis magnet of the rotor assembly is divided into two tangentially, separated by an iron core, i.e., the first rotor connection part 5, thereby reducing the quadrature axis magnetic reluctance, increasing the saliency rate and magnetic reluctance torque of the motor 200, and thus improving the torque density and efficiency of the motor 200.

[0031] In some embodiments, as shown in FIG2, the rotor teeth 21 are provided with mounting grooves 23 on both sides in the circumferential direction, and the mounting grooves 23 and the adjacent first rotor connecting parts 5 form corresponding receiving grooves 22.

[0032] The mounting groove 23 is used to limit the magnet 3, and a corresponding receiving groove 22 is formed between the mounting groove 23 and the adjacent first rotor connecting part 5 to receive the magnet 3. The receiving groove 22 separates the magnet 3 in the tangential direction, and it is supported by the first rotor connecting part 5 and the rotor teeth 21 to ensure that the magnet 3 is stably installed and improve the reliability of the rotor assembly. In this embodiment, by providing the mounting groove 23 on the rotor teeth 21, the rotor teeth 21 have a large circumferential dimension, which facilitates the provision of the mounting groove 23.

[0033] In some embodiments, as shown in FIG2, the mounting groove 23 protrudes from the bottom wall of the end wall near the stator assembly 7 to form rotor pole shoes 29 on the end wall of the rotor teeth 21 near the stator assembly 7, thereby increasing magnetic flux concentration and guiding the magnetic flux to form a uniform air gap magnetic field. The arcuate surface of the rotor pole shoes 29 can "comb" the magnetic lines of force, allowing the magnetic flux to pass through the air gap more concentratedly and enter the stator assembly 7, thereby forming a magnetic field that is closer to an ideal sine wave, which can significantly improve the torque output smoothness and efficiency of the motor 200.

[0034] Furthermore, the setting of rotor pole shoes 29 can also increase the fixing effect of rotor core 2 on magnet 3, and improve the reliability of rotor assembly 100 and motor 200.

[0035] In a specific embodiment, the receiving groove 22 can be formed on a silicon steel sheet by CNC milling or stamping; the receiving groove 22 can be designed as a rectangular or trapezoidal cross section, with dimensions adapted to the width and height of the permanent magnet.

[0036] In other embodiments, mounting grooves 23 may be provided on both sides of the first rotor connecting portion 5 along the circumferential direction, and corresponding receiving grooves 22 may be formed between the first rotor connecting portion 5 and the adjacent rotor teeth 21 for mounting magnets 3. Alternatively, the first rotor connecting portion 5 may form a portion of the receiving groove 22, and the rotor teeth 21 may also form a portion of the receiving groove 22.

[0037] In some embodiments, as shown in Figures 1 and 2, the receiving groove 22 communicates with the gap between the stator assembly 7 and the rotor assembly 100, such that the magnet 3 is at least partially in contact with the gap.

[0038] The gap between the stator assembly 7 and the rotor assembly 100 refers to the radial air gap between them, which provides space for the rotor assembly 100 to rotate relative to the stator assembly 7 and is used to form a magnetic circuit and optimize the magnetic field distribution. The receiving groove 22 is connected to the gap between the stator assembly 7 and the rotor assembly 100 so that at least a portion of the magnet 3 contacts the gap, so that the quadrature magnetic flux path forms a closed loop through the radial air gap between the stator assembly 7 and the rotor assembly 100. This improves the problem that some magnetic flux forms a loop directly in the rotor assembly 100, resulting in some magnetic circuits not passing through the radial air gap, which leads to a small torque. It increases the air gap magnetic flux density and improves the torque density and efficiency of the motor 200.

[0039] In some embodiments, as shown in Figures 1 and 2, the receiving groove 22 is provided on the side of the rotor core 2 that is radially close to the stator assembly 7, and the receiving groove 22 is provided with an opening 221 that communicates with the gap, and the opening 221 is circumferentially close to the first rotor connection portion 5.

[0040] The receiving groove 22 is located on the side of the rotor core 2 along the radial direction of the rotor core 2 close to the stator assembly 7, so that the position of the magnet 3 is close to the stator assembly 7, thereby shortening the magnetic flux, reducing magnetic resistance, and improving the torque density and efficiency of the motor 200. The receiving groove 22 is provided with an opening 221 communicating with the gap. The opening 221 is close to the first rotor connection part 5 in the circumferential direction, so that the magnet 3 partially contacts the gap, so that the cross-axis magnetic flux path forms a closed loop through the radial air gap between the stator assembly 7 and the rotor assembly 100. This improves the problem that some magnetic flux forms a loop directly in the rotor assembly 100, resulting in some magnetic circuits not passing through the radial air gap, which leads to a small torque. This increases the air gap magnetic flux density and improves the torque density and efficiency of the motor 200.

[0041] The above structure facilitates the formation of mounting grooves 23 in the rotor teeth 21. Since the rotor teeth 21 have a large circumferential dimension, they can meet the strength requirements.

[0042] In some embodiments, the receiving groove 22 may not be connected to the gap, so as to confine the magnet 3 in the receiving groove 22, improve the mechanical connection strength between the magnet 3 and the rotor core 2, and enhance the reliability of the motor 200.

[0043] In other embodiments, the opening 221 of the receiving groove 22 may be provided circumferentially close to the rotor teeth 21.

[0044] In some embodiments, as shown in FIG1, two magnets 3 located on both sides of the same first rotor connection portion 5 are arranged in parallel.

[0045] Parallel arrangement refers to the arrangement of two magnets 3 located on both sides of the same first rotor connection part 5 in the receiving groove 22, tangentially spaced and parallel in the direction perpendicular to the tangent, so that the magnetic reluctance of the two magnets 3 along the tangent of the rotor core 2 is more evenly distributed in the radial direction of the rotor core 2, thereby reducing the cross-axis magnetic reluctance of the rotor assembly 100, increasing the cross-axis inductance of the rotor assembly 100, thereby increasing the saliency ratio of the rotor assembly 100, increasing the magnetic reluctance torque of the motor 200, and increasing the torque density and efficiency of the motor 200.

[0046] In some embodiments, as shown in Figures 1 and 2, the size of the first rotor connection portion 5 along the tangential direction is greater than or equal to 1 mm, so as to reduce the cross-axis magnetic reluctance of the rotor assembly 100 and increase the cross-axis inductance of the rotor assembly 100 by utilizing the fact that the magnetic reluctance of the rotor core 2 is less than that of the magnet 3, thereby increasing the saliency ratio of the rotor assembly 100, increasing the magnetic reluctance torque of the motor 200, and increasing the torque density and efficiency of the motor 200.

[0047] In some embodiments, the dimensions of the first rotor connecting portion 5 may specifically be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc. Specific values ​​can be adjusted based on at least some parameters such as the dimensions of the rotor teeth 21, the rotor core 2, and the magnets 3, and the reluctance, to further reduce the quadrature-axis reluctance of the rotor assembly 100, increase the quadrature-axis inductance of the rotor assembly 100, thereby increasing the saliency ratio of the rotor assembly 100 and improving the reluctance torque of the motor 200.

[0048] In some embodiments, the dimensions of the first rotor connection portion 5 are equal in the radial direction of the rotor core 2 and in the tangential direction, so as to reduce the cross-axis magnetic reluctance of the rotor assembly 100 and increase the cross-axis inductance of the rotor assembly 100, thereby increasing the saliency ratio of the rotor assembly 100, increasing the magnetic reluctance torque of the motor 200, and increasing the torque density and efficiency of the motor 200.

[0049] In some embodiments, as shown in Figures 2 and 3, the rotor core 2 further includes a rotor yoke 6 and a plurality of second rotor connecting portions 4 spaced apart circumferentially. The second rotor connecting portions 4 connect the rotor yoke 6 and the corresponding rotor teeth 21 radially along the rotor assembly 100; the first rotor connecting portion 5 is connected to the rotor yoke 6. Specifically, along the circumferential direction of the rotor core 2, the second rotor connecting portions 4 are recessed relative to the corresponding rotor teeth 21; and the second rotor connecting portions 4 are located on the center line of the rotor teeth 21 along the radial direction of the rotor core 2.

[0050] The rotor yoke 6 can be an integral rotor yoke ring or a rotor yoke ring formed by piecing together multiple rotor yokes.

[0051] The rotor yoke 6 is used to connect the rotor teeth 21 and form a closed magnetic circuit. The rotor core 2 also includes a plurality of second rotor connecting parts 4 arranged circumferentially. The second rotor connecting parts 4 connect the rotor yoke 6 and the corresponding rotor teeth 21 radially along the rotor assembly 100 to form a mechanical support structure for the rotor core 2, providing fixation and support for the magnet 3 and improving the reliability of the motor 200.

[0052] The first rotor connecting part 5 is connected to the rotor yoke part 6 to form a complete magnetic circuit loop. The cross-axis magnetic flux path of the rotor is: any first rotor connecting part 5 → radial air gap between stator assembly 7 and rotor assembly 100 → stator assembly 7 → radial air gap → adjacent first rotor connecting part 5 → rotor yoke part 6.

[0053] In this configuration, along the circumference of the rotor core 2, the second rotor connecting portion 4 is recessed relative to the corresponding rotor tooth portion 21, so that the side of the rotor tooth portion 21 near the rotor yoke portion 6 forms a notch 291 with the rotor yoke portion 6, so that the rotor assembly 100 forms a double-spoke rotor, thereby achieving a highly efficient magnetic focusing effect and improving the torque density and operating efficiency of the motor 200.

[0054] The second rotor connecting part 4 is located on the radial center line of the rotor tooth 21 along the rotor core 2, so that the mounting grooves 23 on both sides of the same rotor tooth 21 are recessed toward the corresponding second rotor connecting part 4, so that the notch 291 communicates with the mounting groove 23, thereby achieving a high-efficiency magnetic focusing effect and improving the torque density and operating efficiency of the motor 200.

[0055] In some embodiments, each rotor tooth 21 is connected to only one second rotor connection part 4, and the second rotor connection part 4 is disposed circumferentially in the middle region along the rotor core 2, so that the mounting grooves 23 on both sides of the same rotor tooth 21 are respectively recessed toward the corresponding second rotor connection part 4, so that the notch 291 communicates with the mounting groove 23, thereby achieving a highly efficient magnetic focusing effect and improving the torque density and operating efficiency of the motor 200.

[0056] The direct-axis magnetic flux path of the rotor, i.e., the main magnetic flux path, is: any magnet 3 → rotor tooth 21 → radial air gap between stator assembly 7 and rotor assembly 100 → stator assembly 7 → radial air gap → adjacent rotor tooth 21 → adjacent magnet 3. The recessed arrangement of the second rotor connecting part 4 relative to the corresponding rotor tooth 21 also enables the direct-axis magnetic flux path to form a closed loop through the radial air gap between stator assembly 7 and rotor assembly 100, reducing magnetic flux leakage and improving the problem that some magnetic flux directly forms a loop within rotor assembly 100, resulting in some magnetic circuits not passing through the radial air gap and thus causing low torque. This increases the air gap magnetic flux density and improves the torque density and efficiency of motor 200.

[0057] In some embodiments, the two magnets 3 of each pole of the rotor core 2 are magnetized in the same tangential direction, and the polarities of adjacent rotor teeth 21 are opposite. Thus, each pole magnet 3, the rotor core 2, the radial air gap between the stator and rotor, and the stator assembly 7 form a closed magnetic circuit, and the magnetic flux path is as described above. When the stator windings (not shown) on the stator assembly 7 are energized according to a certain logic, the stator assembly 7 generates a rotating magnetic field under the above magnetic flux path. The rotor assembly 100 rotates under the action of the rotating magnetic field generated by the stator assembly 7 and generates electromagnetic torque and reluctance torque.

[0058] In some embodiments, as shown in Figures 1 and 2, the size of the second rotor connection portion 4 along the tangential direction is 0.5 mm to 1.5 mm. The size of the second rotor connection portion 4 is not less than 0.5 mm to improve the structural strength of the rotor core 2. The size of the second rotor connection portion 4 is not greater than 1.5 mm to achieve the magnetic focusing effect, increase the magnetic flux density, and reduce magnetic flux leakage. This improves the problem that some magnetic flux directly forms a loop in the rotor assembly 100, causing some magnetic circuits to not pass through the radial air gap, resulting in low torque. It increases the air gap magnetic flux density and improves the torque density and operating efficiency of the motor 200.

[0059] In some embodiments, the dimensions of the second rotor connection portion 4 may be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, etc., and the specific values ​​may be adjusted according to at least some parameters such as the dimensions of the rotor teeth 21, the rotor core 2 and the magnet 3, and the magnetic reluctance.

[0060] In other embodiments, the size of the second rotor connection 4 can also be set to 0.5mm to 2mm to further enhance the structural strength of the rotor core 2 and improve the stability of the motor 200 operation.

[0061] In some embodiments, as shown in FIG1, along the circumferential direction, the two sides of the magnet 3 are respectively in contact with the corresponding first rotor connecting part 5 and rotor tooth part 21.

[0062] In this configuration, the magnet 3 is arranged in contact with the rotor teeth 21 along the circumferential direction, so that a continuous low magnetic flux path is formed between the magnet 3 and the rotor teeth 21, reducing the magnetic resistance of the cross-axis magnetic flux path, improving the magnetic flux utilization rate and the torque density of the motor 200; and enabling the rotor teeth 21 to provide direct mechanical support and positioning for the magnet 3, thereby enhancing the structural strength of the rotor assembly 100.

[0063] In this configuration, the magnet 3 is arranged in contact with the first rotor connection part 5 along the circumferential direction, so that a continuous low magnetic flux path is formed between the magnet 3 and the first rotor connection part 5, reducing the magnetic reluctance of the cross-axis magnetic flux path, increasing the cross-axis inductance of the rotor assembly 100, thereby increasing the saliency ratio of the rotor assembly 100, increasing the magnetic reluctance torque of the motor 200, and increasing the torque density and efficiency of the motor 200.

[0064] In some embodiments, as shown in FIG1, the magnetization directions of the magnets 3 located on both sides of the same rotor tooth 21 are opposite.

[0065] The magnets 3 located on both sides of the same rotor tooth 21 are magnetized in opposite directions so that the polarities of adjacent magnetized rotor teeth 21 are opposite, thus forming a closed magnetic circuit.

[0066] In some embodiments, as shown in FIG1 and FIG2, the rotor assembly 100 further includes: a rotating shaft 1, and the rotor core 2 is provided with a central hole 24, with the rotating shaft 1 disposed in the central hole 24.

[0067] The rotor core 2 is provided with a central hole 24 to facilitate the installation of the rotating shaft 1 and to facilitate heat dissipation, thereby improving the heat dissipation efficiency of the motor 200 and enhancing its thermal overload capacity and service life. The rotating shaft 1 is used to transmit torque and can serve as the output shaft of the motor 200.

[0068] In some embodiments, the multiple rotor teeth 21 arranged circumferentially spaced and alternately in the rotor core 2, near the outer end face of the stator assembly, and the multiple first rotor connecting portions 5 near the outer end face of the stator assembly, are located on the same circumference to reduce the cross-axis magnetic reluctance of the rotor assembly 100 and increase the cross-axis inductance of the rotor assembly 100, thereby increasing the saliency ratio of the rotor assembly 100, increasing the magnetic reluctance torque of the motor 200, and increasing the torque density and efficiency of the motor 200.

[0069] In some embodiments, the cross-section of the central hole 24 is circular, such as a perfect circle, to simplify the manufacturing process and improve production efficiency.

[0070] In some embodiments, the rotor yoke 6 has a cross-section that is annular, such as a perfect circular annulus, so that the first rotor connecting part 5 and the second rotor connecting part 4 are arranged in a circumferential array along the rotor core 2, thereby reducing the cross-axis magnetic reluctance of the rotor assembly 100 and increasing the cross-axis inductance of the rotor assembly 100, thereby increasing the saliency ratio of the rotor assembly 100, increasing the magnetic reluctance torque of the motor 200, increasing the torque density and efficiency of the motor 200, and simplifying the manufacturing process and improving production efficiency.

[0071] This application further proposes a motor 200, as shown in Figures 1 to 3. The motor 200 includes: the rotor assembly 100 and the stator assembly 7, with the stator assembly 7 sleeved on the outer periphery of the rotor assembly 100.

[0072] The stator assembly 7 is used to generate a magnetic field. The stator assembly 7 is sleeved on the outer periphery of the rotor assembly 100 to provide rotational power to the rotor assembly 100.

[0073] The rotor assembly 100 includes a rotor core 2 and a plurality of magnets 3. The outer edge of the rotor core 2 is provided with a plurality of rotor teeth 21 and a plurality of first rotor connecting portions 5 arranged alternately and at intervals along its circumference, and receiving grooves 22 are formed between adjacent rotor teeth 21 and first rotor connecting portions 5; the receiving grooves 22 are provided with magnets 3. In this way, the present application can improve the torque density and efficiency of the motor 200.

[0074] For further details and extensions of the motor 200, please refer to the above embodiments, which will not be repeated here.

[0075] In some embodiments, as shown in Figure 4, which is a schematic diagram of the torque simulation results of the motor of this application and a conventional motor, it can be seen from the figure that the reluctance torque of the motor of this application is significantly greater than that of the conventional spoke rotor motor, and the total torque of the motor of this application is significantly greater than that of the conventional spoke rotor motor. Therefore, this application can improve the reluctance torque and total torque of the motor, and improve the torque density and efficiency of the motor.

[0076] The rotor assembly proposed in this application includes a rotor core and multiple magnets. The outer edge of the rotor core has multiple rotor teeth and multiple first rotor connecting portions arranged alternately and at circumferential intervals, with receiving slots formed between adjacent rotor teeth and first rotor connecting portions; the receiving slots are equipped with magnets. This arrangement allows for the placement of two magnets between adjacent rotor teeth and a first rotor connecting portion between two magnets. Because the magnetic reluctance of the rotor core is less than that of the magnets, the quadrature-axis magnetic reluctance of the rotor assembly is reduced, increasing the quadrature-axis inductance of the rotor assembly, thereby increasing the saliency ratio of the rotor assembly (this design hardly changes the direct-axis inductance of the rotor), and improving the reluctance torque of the motor. In this way, this application can improve the torque density and efficiency of the motor.

[0077] Furthermore, the two magnets located on both sides of the same first rotor connection are arranged in parallel so that the magnetic reluctance of the two magnets along the tangential direction of the rotor core is more evenly distributed in the radial direction of the rotor core, thereby reducing the cross-axis magnetic reluctance of the rotor, increasing the cross-axis inductance of the rotor, thereby increasing the saliency ratio of the rotor, increasing the reluctance torque of the motor, and increasing the torque density and efficiency of the motor.

[0078] Furthermore, the receiving slot for the magnet is connected to the gap between the stator assembly and the rotor assembly, so that at least a portion of the magnet contacts the gap, allowing the quadrature magnetic flux path to form a closed loop through the radial air gap between the stator assembly and the rotor assembly. This improves the problem that some magnetic flux forms a loop directly within the rotor assembly, causing some magnetic circuits to not pass through the radial air gap, resulting in lower torque. It increases the air gap magnetic flux density, thereby improving the torque density and efficiency of the motor.

[0079] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A rotor assembly, characterized in that, Built into the stator assembly, the rotor assembly includes: a rotor core, the outer edge of which is provided with a plurality of rotor teeth and a plurality of first rotor connecting portions arranged alternately and spaced apart along the circumference of the rotor core, and a receiving groove is formed between adjacent rotor teeth and first rotor connecting portions; a plurality of magnets, the receiving grooves being provided with the magnets; wherein, two magnets located on both sides of the same first rotor connecting portion have the same magnetization direction, and the magnetization direction is tangential.

2. The rotor assembly according to claim 1, characterized in that, The rotor teeth are provided with mounting grooves on both sides in the circumferential direction, and the mounting grooves form corresponding receiving grooves with the adjacent first rotor connecting parts.

3. The rotor assembly according to claim 2, characterized in that, The receiving groove communicates with the gap between the stator assembly and the rotor assembly, such that the magnet is at least partially in contact with the gap.

4. The rotor assembly according to claim 3, characterized in that, The receiving groove is located on the side of the rotor core along the radial direction of the rotor core near the stator assembly, and the receiving groove has an opening communicating with the gap, the opening being close to the first rotor connection part along the circumferential direction.

5. The rotor assembly according to claim 1, characterized in that, The two magnets located on both sides of the same first rotor connection portion are arranged in parallel.

6. The rotor assembly according to claim 1, characterized in that, Along the tangential direction, the size of the first rotor connection portion is greater than or equal to 1 mm.

7. The rotor assembly according to claim 1, characterized in that, The rotor core further includes a rotor yoke and a plurality of second rotor connecting portions spaced apart along the circumferential direction. The second rotor connecting portions connect the rotor yoke and the corresponding rotor teeth in the radial direction of the rotor assembly. The first rotor connecting portion is connected to the rotor yoke. In the circumferential direction, the second rotor connecting portion is recessed relative to the corresponding rotor teeth. The second rotor connecting portion is located on the center line of the rotor teeth along the radial direction of the rotor core.

8. The rotor assembly according to claim 7, characterized in that, Along the tangential direction, the size of the second rotor connection portion is 0.5 mm to 1.5 mm.

9. The rotor assembly according to claim 1, characterized in that, Along the circumferential direction, the two sides of the magnet are respectively in contact with the corresponding first rotor connection portion and the rotor teeth portion.

10. The rotor assembly according to claim 1, characterized in that, The magnets located on both sides of the same rotor tooth section are magnetized in opposite directions.

11. The rotor assembly according to claim 2, characterized in that, The mounting groove protrudes from the bottom wall of the mounting groove near the end wall of the stator assembly to form a rotor pole shoe on the rotor teeth near the end wall of the stator assembly.

12. The rotor assembly according to any one of claims 1 to 11, characterized in that, The rotor assembly further includes a shaft, wherein the rotor core has a central hole and the shaft is disposed in the central hole.

13. An electric motor, characterized in that, The motor includes: a rotor assembly as described in any one of claims 1 to 12; and a stator assembly sleeved on the outer periphery of the rotor assembly.

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