permanent magnet synchronous motor

Abstract

The application relates to a permanent magnet synchronous motor which comprises a rotor back iron and a magnetic steel array assembly arranged on the inner circumferential surface of the rotor back iron and configured as a continuous structure extending along the circumference of the rotor back iron; the magnetic steel array assembly comprises multiple groups of magnetic steel groups connected in sequence along the circumference of the rotor back iron; and the head and tail of the magnetic steel array assembly have gaps along the circumference of the rotor back iron. The permanent magnet synchronous motor provided by the application embodiment has the head and tail of the magnetic steel array assembly with gaps along the circumference of the rotor back iron, so that the magnetic steel groups in the magnetic steel array assembly are dislocated along the circumference, the torque generated by the magnetic steel groups is also dislocated, the arrangement of the magnetic steel groups is optimized, the distribution of the magnetic circuit is changed, the cogging torque is greatly reduced, the torque fluctuation and vibration of the motor are reduced, the noise of the motor during operation is small, the energy-saving effect is good, the control precision is high, and the motor can be widely applied to occasions requiring high-precision control.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to permanent magnet synchronous motors. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) are widely used in industrial automation, electric vehicles, and aerospace due to their high efficiency and power density. However, PMSMs with high pole numbers and Halbach magnet arrays have higher cogging torque. High cogging torque leads to torque ripple and vibration, resulting in high motor noise and low control accuracy, making them unsuitable for high-precision control applications. Summary of the Invention

[0003] Therefore, it is necessary to provide a permanent magnet synchronous motor to address the problems of high cogging torque in some existing permanent magnet synchronous motors, which leads to high motor noise and low control accuracy.

[0004] A permanent magnet synchronous motor includes a rotor back iron and a magnet array assembly; the magnet array assembly is disposed on the inner circumferential surface of the rotor back iron and is constructed as a continuous structure extending circumferentially along the rotor back iron; the magnet array assembly includes multiple sets of magnets connected sequentially along the circumferential direction of the rotor back iron.

[0005] Wherein, along the circumferential direction of the rotor back iron, the magnet array assembly has a gap at both ends.

[0006] In some embodiments, the central axes of the two sets of magnets arranged radially opposite each other along the rotor back iron are set at an included angle.

[0007] In some embodiments, each of the magnet groups includes a first magnet, a second magnet, a third magnet, and a fourth magnet arranged sequentially;

[0008] The magnetization directions of the first magnet, the second magnet, the third magnet, and the fourth magnet are all different.

[0009] In some embodiments, the first magnet and the third magnet are magnetized in opposite directions;

[0010] The second magnet has the opposite magnetization direction to the fourth magnet.

[0011] In some embodiments, the first magnet and the third magnet are radial magnets;

[0012] The second magnet and the fourth magnet are tangential magnets.

[0013] In some embodiments, the central angle θ1 of the first magnet satisfies the condition:

[0014] θ1= ;

[0015] Where s satisfies the following condition:

[0016] s=6p;

[0017] p is the number of the magnet groups, and p is a positive even number greater than or equal to 2.

[0018] In some embodiments, the central angle θ2 of the third magnet is the same as the central angle θ1 of the first magnet.

[0019] In some embodiments, the central angle θ3 of the second magnet satisfies the following condition:

[0020] θ3= ;

[0021] Where s satisfies the following condition:

[0022] s=6p;

[0023] p is the number of the magnet groups, and p is a positive even number greater than or equal to 2.

[0024] In some embodiments, the central angle θ4 of the fourth magnet is the same as the central angle θ3 of the second magnet.

[0025] In some embodiments, the magnet assembly is a fan-ring structure.

[0026] In some embodiments, the magnet array assembly is a fan-ring structure.

[0027] In some embodiments, the central angle θ5 of the magnet array assembly satisfies the following condition:

[0028] θ5= ;

[0029] Where s satisfies the following condition:

[0030] s=6p;

[0031] p is the number of the magnet groups, and p is a positive even number greater than or equal to 2.

[0032] In some embodiments, the magnet array assembly has a size-reducing structure on the side facing away from the inner circumferential surface of the rotor back iron along the radial direction of the rotor back iron.

[0033] In some embodiments, the permanent magnet synchronous motor further includes a mounting assembly;

[0034] The mounting component is configured with a snap-fit ​​groove;

[0035] The rotor back iron and the magnet array assembly are snapped into the snap-fit ​​groove.

[0036] In some embodiments, the installation component includes:

[0037] The rotor housing has a first receiving cavity, the first receiving cavity having a first opening along the radial direction of the rotor back iron and a second opening along the axial direction of the rotor back iron; the first opening and the second opening are in communication.

[0038] An end plate is installed at the second opening of the rotor housing. The end plate has a second receiving cavity, and the second receiving cavity has a third opening along the axial direction of the rotor back iron. The third opening is disposed opposite to the second opening.

[0039] The second receiving cavity and the first receiving cavity together form the snap-fit ​​groove.

[0040] In some embodiments, the cavity wall of the first receiving cavity extending radially along the rotor back iron and away from the end plate includes:

[0041] The first sidewall is radially parallel to the rotor back iron;

[0042] The second sidewall is connected to the first sidewall and is located on the side closer to the first opening; the end of the second sidewall away from the first sidewall extends obliquely toward the side closer to the end plate;

[0043] One of the sidewalls of the rotor back iron along its axial direction is in contact with the first sidewall;

[0044] One of the sidewalls of the magnet array assembly along the axial direction of the rotor back iron is attached to the second sidewall.

[0045] In some embodiments, the cavity wall of the second receiving cavity extending radially along the rotor back iron and away from the rotor housing includes:

[0046] The third sidewall is radially parallel to the rotor back iron;

[0047] A fourth sidewall is connected to the third sidewall and located on the side closer to the first opening; the end of the fourth sidewall away from the third sidewall extends obliquely toward the side closer to the rotor housing.

[0048] The rotor back iron has one of its axial sidewalls in contact with the third sidewall;

[0049] The magnet array assembly has one of its sidewalls, along the axial direction of the rotor back iron, attached to the fourth sidewall.

[0050] In some embodiments, the permanent magnet synchronous motor further includes a filler;

[0051] The filler is connected to the head-to-tail position of the magnet array assembly.

[0052] In some embodiments, the filler is a soft magnetic filler.

[0053] In some embodiments, the central angle θ6 of the filler satisfies the following condition:

[0054] θ6= ;

[0055] Where s satisfies the following condition:

[0056] s=6p;

[0057] p is the number of the magnet groups, and p is a positive even number greater than or equal to 2.

[0058] The permanent magnet synchronous motor provided in this application embodiment includes multiple sets of magnets connected sequentially along the circumference of the rotor back iron in the magnet array assembly. The magnet array assembly has gaps at its ends along the circumference of the rotor back iron, causing the magnets within the magnet array assembly to be misaligned along the circumference. This results in a misalignment of the torque generated by the magnets, optimizing the arrangement of the magnets, changing the magnetic circuit distribution, significantly reducing cogging torque, and maintaining output torque performance. This reduces motor torque fluctuations and vibrations, resulting in lower operating noise, better energy efficiency, and higher control precision. It can be widely used in applications requiring high-precision control, ultimately broadening the application scenarios of this permanent magnet synchronous motor. Attached Figure Description

[0059] Figure 1 This is a schematic diagram showing the connection between the rotor back iron and the magnet array assembly in a permanent magnet synchronous motor provided in some embodiments of this application.

[0060] Figure 2 This is a schematic diagram showing the connection between the rotor back iron and the magnet array assembly in a permanent magnet synchronous motor provided in other embodiments of this application.

[0061] Figure 3 for Figure 1 The diagram shows a magnetic array assembly.

[0062] Figure 4 for Figure 1 The sectional view shown at point AA.

[0063] Figure 5 for Figure 4 The diagram shows a cross-sectional view of the rotor back iron and magnet array assembly mounted on the mounting assembly.

[0064] Figure 6 for Figure 5 A schematic diagram of the installation components is shown.

[0065] Figure 7 for Figure 6 The diagram shows a schematic of the rotor housing.

[0066] Figure 8 for Figure 6 A schematic diagram of the end plate shown.

[0067] Reference numerals: 100-Rotor back iron; 200-Magnet array assembly; 210-Magnet group; 211-First magnet; 212-Second magnet; 213-Third magnet; 214-Fourth magnet; 220-Fifth side wall; 230-Sixth side wall; 300-Mounting assembly; 310-Snap-fit ​​groove; 320-Rotor housing; 321-First receiving cavity; 3211-First opening; 3212-Second opening; 3213-First side wall; 3214-Second side wall; 330-End plate; 331-Second receiving cavity; 3311-Third opening; 3312-Third side wall; 3313-Fourth side wall; 400-Filling material; p1-First central axis; p2-Second central axis. Detailed Implementation

[0068] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0069] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0070] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0072] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0074] See Figures 1-3 , Figure 1 This paper shows a schematic diagram of the connection between the rotor back iron 100 and the magnet array assembly 200 in a permanent magnet synchronous motor provided in some embodiments of this application. Figure 2 A schematic diagram showing the connection between the rotor back iron 100 and the magnet array assembly 200 in a permanent magnet synchronous motor provided in other embodiments of this application is shown. Figure 3 It shows Figure 1 A schematic diagram of the magnet array assembly 200 shown.

[0075] An embodiment of this application provides a permanent magnet synchronous motor, which includes a rotor back iron 100 and a magnet array assembly 200. The magnet array assembly 200 is disposed on the inner circumferential surface of the rotor back iron 100 and is constructed as a continuous structure extending circumferentially along the rotor back iron 100. The magnet array assembly 200 includes multiple sets of magnet groups 210 connected sequentially along the circumferential direction of the rotor back iron 100. The beginning and end of the magnet array assembly 200 are spaced apart along the circumferential direction of the inner circumferential surface of the rotor back iron 100.

[0076] The permanent magnet synchronous motor provided in this application embodiment includes multiple sets of magnet groups 210 connected sequentially along the circumference of the rotor back iron 100 in the magnet array assembly 200. The magnet array assembly 200 has gaps at its ends along the circumference of the rotor back iron 100, causing the magnet groups 210 within the magnet array assembly 200 to be misaligned circumferentially. This misalignment of the torque generated by the magnet groups 210 optimizes the arrangement of the magnet groups 210, changes the magnetic circuit distribution, and significantly reduces cogging torque while maintaining output torque performance. This reduces motor torque fluctuations and vibrations, resulting in lower operating noise, better energy efficiency, and higher control precision. It can be widely used in applications requiring high-precision control, ultimately broadening the application scenarios of this permanent magnet synchronous motor.

[0077] It should be noted that in traditional permanent magnet synchronous motors, the magnet array assembly 200 is connected end-to-end, or the entire magnet array assembly 200 is evenly distributed. Therefore, it can divide the motor along the circumference of the rotor back iron 100 into multiple regions equal to the number of magnet groups 210, with each magnet group 210 located at the center of that region. However, in this application, because the magnet array assembly 200 has gaps between its ends, each magnet group 210 is misaligned compared to the conventional arrangement. This misalignment causes a phase shift in the cogging torque waveform. The superposition of these phase shifts eliminates the main order of cogging torque, ultimately resulting in a significant reduction in the overall cogging torque of the permanent magnet synchronous motor.

[0078] In one specific embodiment, the rotor back iron 100 serves as a support structure for the magnet array assembly 200. The magnet array assembly 200 is bonded and fixed to the inner circumferential surface of the rotor back iron 100, making the fixing of the magnet array assembly 200 and the rotor back iron 100 simpler and more convenient. This optimizes the fixing method of the magnet array assembly 200 and the rotor back iron 100, ensuring not only the stability and precise positioning of the connection between the two, but also enhancing the stability and safety of the permanent magnet synchronous motor during high-speed operation. Of course, in other embodiments, the magnet array assembly 200 can also be snapped or welded to the inner circumferential surface of the rotor back iron 100; there is no particular limitation on this.

[0079] The following is a detailed description of the structure of a permanent magnet synchronous motor. Please refer to [link / reference]. Figures 4-8 , Figure 4 It shows Figure 1 The sectional view shown at point AA. Figure 5 It shows Figure 4 The diagram shows a cross-sectional view of the rotor back iron 100 and the magnet array assembly 200 mounted on the mounting assembly 300. Figure 6 It shows Figure 5 A schematic diagram of the mounting component 300 is shown. Figure 7 It shows Figure 6 The schematic diagram of the rotor housing 320 is shown. Figure 8 It shows Figure 6 A schematic diagram of end plate 330 is shown.

[0080] Please see Figures 1-3 In some embodiments, the central axes of two sets of magnet assemblies 210 arranged radially opposite each other along the rotor back iron 100 are set at an included angle. For example... Figures 1-3 As shown, the central axis of one set of magnets 210 is the first central axis p1, while the central axis of the magnets 210 arranged radially opposite to this set of magnets 210 is the second central axis p2. Since the first central axis p1 and the second central axis p2 are set at an angle, it means that one of the two sets of magnets 210 arranged radially opposite to each other is misaligned with the other set of magnets 210 along the circumference of the rotor back iron 100. The two are not a symmetrical structural design, which allows the torque generated by the magnets 210 to also be misaligned, thereby optimizing the arrangement of the magnets 210, changing the distribution of the magnetic circuit, and thus significantly reducing the cogging torque. This reduces the torque fluctuation and vibration of the motor, resulting in lower motor noise and higher control accuracy.

[0081] Please see Figures 1-3 In some embodiments, any two adjacent sets of magnets 210 are closely fitted together, so that there are no gaps between adjacent sets of magnets 210 within the entire magnet array assembly 200, which is beneficial to the uniformity of the magnetic field.

[0082] Please see Figures 1-3 In some embodiments, each magnet group 210 includes a first magnet 211, a second magnet 212, a third magnet 213, and a fourth magnet 214 arranged sequentially; the magnetization directions of the first magnet 211, the second magnet 212, the third magnet 213, and the fourth magnet 214 are all different.

[0083] The magnetization directions of the first magnet 211, the second magnet 212, the third magnet 213, and the fourth magnet 214 can be either clockwise or counterclockwise by 90°. For example, the magnetization direction of the first magnet 211 is radially toward the center of the rotor back iron 100; the second magnet 212 rotates 90° clockwise from the magnetization direction of the first magnet 211 to the left along the circumference of the rotor back iron 100; the third magnet 213 rotates 90° clockwise from the magnetization direction of the second magnet 212 to the side away from the center along the radial direction of the rotor back iron 100; and the fourth magnet 214 rotates 90° clockwise from the magnetization direction of the third magnet 213 to the right along the circumference of the rotor back iron 100.

[0084] Of course, the magnetization directions of the first magnet 211, the second magnet 212, the third magnet 213 and the fourth magnet 214 can also be spaced apart by other angles such as 80° or 100°, and no special limitation is made in this regard.

[0085] By setting the magnetization directions of the first magnet 211, the second magnet 212, the third magnet 213, and the fourth magnet 214 to be different, the magnet array of this motor is set to be more balanced.

[0086] Please see Figures 1-3 In some embodiments, the first magnet 211, the second magnet 212, the third magnet 213 and the fourth magnet 214 are closely fitted together, so that there are no gaps between adjacent magnets in each magnet group 210, which is beneficial to the uniformity of the magnetic field.

[0087] Please see Figures 1-3 In some embodiments, the first magnet 211 and the third magnet 213 are magnetized in opposite directions; the second magnet 212 and the fourth magnet 214 are magnetized in opposite directions.

[0088] By setting the magnetization directions of the first magnet 211 and the third magnet 213 to opposite directions, and the magnetization directions of the second magnet 212 and the fourth magnet 214 to opposite directions, the magnet group 210 can form a permanent magnet synchronous motor with a Halbach magnet array, thereby making the magnetic field more concentrated and uniform, and significantly improving the utilization rate of the magnetic field and the system efficiency.

[0089] Please see Figures 1-3In some embodiments, the first magnet 211 and the third magnet 213 are radial magnets; the second magnet 212 and the fourth magnet 214 are tangential magnets.

[0090] Radial magnetic poles are magnetic poles whose magnetization direction is arranged radially along the rotor back iron 100; tangential magnetic poles are magnetic poles whose magnetization direction is arranged tangentially along the circumferential direction of the rotor back iron 100. By setting the first magnet 211 and the third magnet 213 as radial magnets, and the second magnet 212 and the fourth magnet 214 as tangential magnets, the magnet group 210 is not tilted along the axial direction of the rotor back iron 100.

[0091] Please see Figures 1-3 In some embodiments, the central angle θ1 of the first magnet 211 satisfies the condition: θ1 = Where s satisfies the condition: s=6p; p is the number of magnet groups 210, and p is a positive even number greater than or equal to 2.

[0092] By setting the central angle θ1 of the first magnet 211 to satisfy the above formula conditions, the central angle of each first magnet 211 is made to be the same, thus satisfying the principles of motor design. In some embodiments, p equals 2, and therefore s equals 12. In other embodiments, p equals 4, and s equals 24. Of course, in other embodiments, p can also equal other positive even numbers such as 6, 8, or 10, without special limitation.

[0093] Please see Figures 1-3 In some embodiments, the central angle θ2 of the third magnet 213 is the same as the central angle θ1 of the first magnet 211.

[0094] By setting the central angle θ2 of the third magnet 213 to be equal to the central angle θ1 of the first magnet 211, the third magnet 213 and the first magnet 211 are made to be the same size, which not only facilitates processing, but also makes the magnetic field distribution more uniform.

[0095] Please see Figures 1-3 In some embodiments, the central angle θ3 of the second magnet 212 satisfies the condition: θ3 = Where s satisfies the condition: s=6p; p is the number of magnet groups 210, and p is a positive even number greater than or equal to 2.

[0096] By setting the central angle θ3 of the second magnet 212 to satisfy the above formula conditions, the central angle of each second magnet 212 is made to be the same, thus satisfying the principles of motor design. In some embodiments, p equals 2, and therefore s equals 12. In other embodiments, p equals 4, and s equals 24. Of course, in other embodiments, p can also equal other positive even numbers such as 6, 8, or 10, without special limitation.

[0097] Please see Figures 1-3 In some embodiments, the central angle θ4 of the fourth magnet 214 is the same as the central angle θ3 of the second magnet 212.

[0098] By setting the central angle θ4 of the fourth magnet 214 to be equal to the central angle θ3 of the second magnet 212, the fourth magnet 214 and the second magnet 212 are made to be the same size, which not only facilitates processing, but also makes the magnetic field distribution more uniform.

[0099] This application sets the first magnet 211 and the third magnet 213 to be the same size, and the second magnet 212 and the fourth magnet 214 to be the same size. The central angle of the first magnet 211 and the third magnet 213 is equal to twice the central angle of the second magnet 212 and the fourth magnet 214, so that the size of the radial magnet is larger than the size of the tangential magnet, thereby making the final magnetic field more balanced.

[0100] This application sets the size of the radial magnet to be equal to twice the size of the tangential magnet, thereby making the distribution of the entire magnetic field more balanced. As a result, the magnetic force on the rotor of the motor is more balanced when it rotates around its own rotation axis, and the rotation process is more stable.

[0101] Please see Figures 1-3 In some embodiments, the magnet group 210 has a fan-ring structure. By setting the magnet group 210 as a fan-ring structure, the magnet array assembly 200 assembled from multiple magnet groups 210 forms a fan-ring structure. This not only facilitates the installation of the entire magnet array assembly 200, but also ensures that the processing of the first magnet 211, the second magnet 212, the third magnet 213, and the fourth magnet 214 are all fan-ring structures on the same concentric circle, which facilitates processing and installation alignment, and results in better magnetic field uniformity.

[0102] Please see Figures 1-3 In some embodiments, the magnet array assembly 200 is a fan-ring structure.

[0103] By setting the magnet array assembly 200 as a fan-ring structure, the size and angle of each group of magnets 210 that make up the magnet array assembly 200 are the same, which facilitates processing and installation alignment, and the magnetic field generated is also more balanced.

[0104] Please see Figures 1-3 In some embodiments, the central angle θ5 of the magnet array assembly 200 satisfies the condition: θ5 = Where s satisfies the condition: s=6p; p is the number of magnet groups 210, and p is a positive even number greater than or equal to 2.

[0105] By setting the central angle θ5 of the entire magnet array assembly 200 to satisfy the above formula conditions, the central angle of the magnet array assembly 200 satisfies the principles of motor design, and the proportion of the magnet array assembly 200 in the circumference of the entire rotor back iron 100 is effectively guaranteed.

[0106] Please see Figures 4-5 In some embodiments, along the radial direction of the rotor back iron 100, the magnet array assembly 200 has a gradually decreasing size design on the side facing away from the inner circumferential surface of the rotor back iron 100; specifically, the radial direction of the rotor back iron is... Figure 4 and Figure 5 The direction of xx' in the middle.

[0107] By designing the magnet array assembly 200 with a gradually decreasing size on the side facing away from the inner circumferential surface of the rotor back iron 100, the magnet array assembly 200 has an inclined sidewall, which makes it easier for the magnet array assembly 200 to be snapped into the rotor housing 320 and other structures of the permanent magnet synchronous motor, and easier to clamp and fix, thereby reducing the possibility of the magnet array assembly 200 falling off along the radial direction of the rotor back iron 100.

[0108] In one specific embodiment, the side of the magnet array assembly 200 facing away from the inner circumferential surface of the rotor back iron 100 is configured as a trapezoidal structure, and the length of the bottom edge of the side away from the inner circumferential surface of the rotor back iron 100 is smaller than the length of the bottom edge of the side closer to the inner circumferential surface of the rotor back iron 100. This makes the magnet array assembly 200 a structure with a gradually decreasing size along the radial direction of the rotor back iron 100 toward the center, which facilitates snap-fit ​​connection with other structures such as the rotor housing 320 and makes it easier to clamp and fix, thereby reducing the possibility of the magnet array assembly 200 falling off along the radial direction of the rotor back iron 100.

[0109] Please see Figure 5 and Figure 6 In some embodiments, the permanent magnet synchronous motor further includes a mounting assembly 300; the mounting assembly 300 is configured with a snap-fit ​​groove 310; the rotor back iron 100 and the magnet array assembly 200 are snapped into the snap-fit ​​groove 310.

[0110] The mounting component 300 sets up a snap-fit ​​groove 310, and the rotor back iron 100 and the magnet array assembly 200 are snapped into the snap-fit ​​groove 310, thereby achieving the assembly and fixation of the two, which is relatively simple and convenient.

[0111] Please see Figures 5-6 and combined Figure 7 In some embodiments, the mounting assembly 300 includes: a rotor housing 320 having a first receiving cavity 321, the first receiving cavity 321 having a first opening 3211 radially along the rotor back iron 100 and a second opening 3212 axially along the rotor back iron 100; specifically, the axial direction of the rotor back iron is... Figure 5 The direction indicated by axis p3 in the middle is... Figures 5-7 The direction parallel to the yy' direction; the first opening 3211 and the second opening 3212 are connected. Please refer to [link / reference]. Figures 5-6 and combined Figure 8 In some embodiments, the mounting assembly 300 further includes an end plate 330 mounted at the second opening 3212 of the rotor housing 320. The end plate 330 is configured with a second receiving cavity 331. The second receiving cavity 331 has a third opening 3311 along the axial direction of the rotor back iron 100. The third opening 3311 is disposed opposite to the second opening 3212. The second receiving cavity 331 and the first receiving cavity 321 together form a snap-fit ​​groove 310.

[0112] By constructing a first receiving cavity 321 with a first opening 3211 and a second opening 3212 on the rotor housing 320, and a second receiving cavity 331 with a third opening 3311 on the end plate 330, when the end plate 330 is installed on the rotor housing 320, the first receiving cavity 321 and the second receiving cavity 331 can jointly form a snap-fit ​​groove 310, thereby facilitating the snap-fit ​​between the rotor back iron 100 and the magnet array assembly 200.

[0113] Specifically, when the magnet array assembly 200 is installed after the rotor back iron 100, it forms as follows: Figure 4 In the structure shown, the magnet array assembly 200 and the rotor back iron 100 are first installed on the rotor housing 320 through the first opening 3211 and the second opening 3212, and then the end plate 330 is installed on the rotor housing 320 through the second opening 3212. In this way, the assembly of the magnet array assembly 200 and the rotor back iron 100 with the mounting assembly 300 is realized, which is relatively simple and convenient.

[0114] In one specific embodiment, the rotor back iron 100 and the magnet array assembly 200 can be connected to the rotor housing 320 by a heat-shrink fitting. The end plate 330 is connected to the rotor housing 320 by a threaded connection.

[0115] Please see Figure 7 In some embodiments, the cavity wall of the first receiving cavity 321 extending radially along the rotor back iron 100 and away from the end plate 330 includes a first sidewall 3213 and a second sidewall 3214. The first sidewall 3213 is radially parallel to the rotor back iron 100; the second sidewall 3214 is connected to the first sidewall 3213 and located on the side near the first opening 3211; the end of the second sidewall 3214 away from the first sidewall 3213 extends obliquely toward the side near the end plate 330; one of the sidewalls of the rotor back iron 100 along its axial direction is in contact with the first sidewall 3213; one of the sidewalls of the magnet array assembly 200 along the axial direction of the rotor back iron 100 is in contact with the second sidewall 3214.

[0116] By configuring the cavity wall of the first receiving cavity 321 extending radially along the rotor back iron 100 and away from the end plate 330 as a first sidewall 3213 and a second sidewall 3214, with the second sidewall 3214 being an inclined sidewall, and by fitting the first sidewall 3213 to the fifth sidewall 220 of the rotor back iron 100 and the second sidewall 3214 to the inclined sidewall of the magnet array assembly 200, the possibility of the magnet array assembly 200 detaching radially along the rotor back iron 100 can be reduced through the fitting of the first sidewall 3213 and the second sidewall 3214.

[0117] Please see Figure 8 In some embodiments, the second receiving cavity 331 extends radially along the rotor back iron 100 and the cavity wall on the side away from the rotor housing 320 includes a third sidewall 3312 and a fourth sidewall 3313. The third sidewall 3312 is radially parallel to the rotor back iron 100; the fourth sidewall 3313 is connected to the third sidewall 3312 and located on the side near the first opening 3211; the end of the fourth sidewall 3313 away from the third sidewall 3312 extends obliquely toward the side near the rotor housing 320; another sidewall of the rotor back iron 100 along its axial direction is attached to the third sidewall 3312; another sidewall of the magnet array assembly 200 along the axial direction of the rotor back iron 100 is attached to the fourth sidewall 3313.

[0118] By configuring the cavity wall of the second receiving cavity 331 extending radially along the rotor back iron 100 and away from the rotor housing 320 as a third sidewall 3312 and a fourth sidewall 3313, with the fourth sidewall 3313 being an inclined sidewall, and by fitting the third sidewall 3312 to the sixth sidewall 230 of the rotor back iron 100 and the fourth sidewall 3313 to the inclined sidewall of the magnet array assembly 200, the possibility of the magnet array assembly 200 detaching radially along the rotor back iron 100 can be reduced through the fitting of the third sidewall 3312 and the fourth sidewall 3313.

[0119] Please see Figure 1 In some embodiments, the permanent magnet synchronous motor further includes a filler 400; the filler 400 is connected to the head-to-tail position of the magnet array assembly 200.

[0120] By placing filler elements 400 at the opposite ends of the unconnected magnet array assembly 200, a more balanced circular structure in shape, structure, and weight can be formed between the filler elements 400 and the magnet array assembly 200. When the rotor back iron 100 rotates with the rotor shaft, the more balanced circular structure formed by the magnet array assembly 200 and the filler elements 400 mounted on its inner circumference makes the rotation of the rotor back iron 100 more stable.

[0121] In some embodiments, the filler 400 is a soft magnetic filler. By setting the filler 400 as a soft magnetic filler, the soft magnetic filler can have a high magnetic permeability, thereby enabling the entire magnet array assembly 200 and the soft magnetic filler to form a relatively balanced magnetic structure when the permanent magnet synchronous motor is energized, thus generating a relatively stable magnetic field; while when the motor is de-energized, the magnetization of the soft magnetic filler can be rapidly reduced to near zero.

[0122] Please see Figure 1 In some embodiments, the central angle θ6 of the filler 400 satisfies the condition: θ6 = Where s satisfies the condition: s=6p; p is the number of magnet groups 210, and p is a positive even number greater than or equal to 2.

[0123] By setting the central angle θ6 of the filler 400 to satisfy the above formula adjustment, the sum of the central angles θ6 of the filler 400 and θ5 of the magnet array assembly 200 is 360°, which is a complete circular ring structure. As a result, the circular ring structure formed by the magnet array assembly 200 and the filler 400 has better dynamic balance when the rotor back iron 100 rotates, which makes the rotation process of the rotor back iron 100 more balanced and the generated magnetic field more balanced.

[0124] In some other embodiments, p equals 4 and s equals 24. Of course, in other embodiments, p can also equal other positive even numbers such as 6, 8, or 10, and there is no special limitation on this.

[0125] The permanent magnet synchronous motor provided in this application embodiment decouples the head and tail of the magnet array assembly 200 and places soft magnetic fillers at the opposite ends of the magnet array assembly 200. Furthermore, by limiting the central angle θ5 of the 210 magnet components and the central angle θ6 of the soft magnetic fillers, this permanent magnet synchronous motor can significantly reduce cogging torque while maintaining its original output torque capability. Moreover, the arrangement of the magnet array assembly 200 in the permanent magnet synchronous motor provided in this application embodiment has good repeatability and applicability, making it suitable for manufacturing motors of different sizes and types.

[0126] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A permanent magnet synchronous motor, characterized in that, The permanent magnet synchronous motor includes: Rotor back iron (100); and A magnet array assembly (200) is disposed on the inner circumferential surface of the rotor back iron (100) and is constructed as a continuous structure extending circumferentially along the rotor back iron (100); the magnet array assembly (200) includes multiple sets of magnet groups (210) connected sequentially along the circumferential direction of the rotor back iron (100); each magnet group (210) includes a first magnet (211), a second magnet (212), a third magnet (213), and a fourth magnet (214) arranged sequentially; the magnetization directions of the first magnet (211), the second magnet (212), the third magnet (213), and the fourth magnet (214) are all different; any two adjacent sets of magnet groups (210) are tightly fitted together; Wherein, along the circumference of the rotor back iron (100), the beginning and end of the magnet array assembly (200) are spaced apart, so that the central axes of the two sets of magnet groups (210) arranged radially opposite to each other along the rotor back iron (100) are arranged at an angle.

2. The permanent magnet synchronous motor according to claim 1, characterized in that, The first magnet (211) and the third magnet (213) are magnetized in opposite directions; The magnetization direction of the second magnet (212) is opposite to that of the fourth magnet (214).

3. The permanent magnet synchronous motor according to claim 1, characterized in that, The first magnet (211) and the third magnet (213) are radial magnets; The second magnet (212) and the fourth magnet (214) are tangential magnets.

4. The permanent magnet synchronous motor according to any one of claims 1-3, characterized in that, The central angle θ1 of the first magnet (211) satisfies the following condition: θ1= ; Where s satisfies the following condition: s=6p; p is the number of the magnet groups (210), and p is a positive even number greater than or equal to 2.

5. The permanent magnet synchronous motor according to claim 4, characterized in that, The central angle θ2 of the third magnet (213) is the same as the central angle θ1 of the first magnet (211).

6. The permanent magnet synchronous motor according to any one of claims 1-3, characterized in that, The central angle θ3 of the second magnet (212) satisfies the following condition: θ3= ; Where s satisfies the following condition: s=6p; p is the number of the magnet groups (210), and p is a positive even number greater than or equal to 2.

7. The permanent magnet synchronous motor according to claim 6, characterized in that, The central angle θ4 of the fourth magnet (214) is the same as the central angle θ3 of the second magnet (212).

8. The permanent magnet synchronous motor according to any one of claims 1-3, characterized in that, The magnet assembly (210) has a fan-ring structure.

9. The permanent magnet synchronous motor according to any one of claims 1-3, characterized in that, The magnet array assembly (200) has a fan-ring structure.

10. The permanent magnet synchronous motor according to claim 9, characterized in that, The central angle θ5 of the magnet array assembly (200) satisfies the following condition: θ5= ; Where s satisfies the following condition: s=6p; p is the number of the magnet groups (210), and p is a positive even number greater than or equal to 2.

11. The permanent magnet synchronous motor according to any one of claims 1-3, characterized in that, Along the radial direction of the rotor back iron (100), the magnet array assembly (200) has a gradually decreasing size structure on the side opposite to the inner circumferential surface of the rotor back iron (100).

12. The permanent magnet synchronous motor according to claim 11, characterized in that, The permanent magnet synchronous motor also includes a mounting assembly (300). The mounting component (300) is configured with a snap-fit ​​groove (310); The rotor back iron (100) and the magnet array assembly (200) are snapped into the snap-fit ​​groove (310).

13. The permanent magnet synchronous motor according to claim 12, characterized in that, The mounting component (300) includes: The rotor housing (320) is configured with a first receiving cavity (321), the first receiving cavity (321) having a first opening (3211) along the radial direction of the rotor back iron (100) and a second opening (3212) along the axial direction of the rotor back iron (100); the first opening (3211) and the second opening (3212) are connected; An end plate (330) is installed at the second opening (3212) of the rotor housing (320). The end plate (330) is configured with a second receiving cavity (331). The second receiving cavity (331) has a third opening (3311) along the axial direction of the rotor back iron (100). The third opening (3311) is disposed opposite to the second opening (3212). The second receiving cavity (331) and the first receiving cavity (321) together form the snap-fit ​​groove (310).

14. The permanent magnet synchronous motor according to claim 13, characterized in that, The cavity wall of the first receiving cavity (321), which extends radially along the rotor back iron (100) and is located away from the end plate (330), comprises: The first sidewall (3213) is radially parallel to the rotor back iron (100); The second sidewall (3214) is connected to the first sidewall (3213) and is located on the side closer to the first opening (3211); the end of the second sidewall (3214) away from the first sidewall (3213) extends obliquely toward the side closer to the end plate (330); One of the sidewalls of the rotor back iron (100) along its axial direction is in contact with the first sidewall (3213); The magnet array assembly (200) has one sidewall of the rotor back iron (100) in the axial direction that is attached to the second sidewall (3214).

15. The permanent magnet synchronous motor according to claim 13, characterized in that, The second receiving cavity (331) extends radially along the rotor back iron (100) and the cavity wall on the side away from the rotor housing (320) includes: The third sidewall (3312) is radially parallel to the rotor back iron (100); The fourth sidewall (3313) is connected to the third sidewall (3312) and is located on the side closer to the first opening (3211); the end of the fourth sidewall (3313) away from the third sidewall (3312) extends obliquely toward the side closer to the rotor housing (320); The rotor back iron (100) has one of its sidewalls along its axial direction in contact with the third sidewall (3312); The magnet array assembly (200) has one of its sidewalls in the axial direction of the rotor back iron (100) in contact with the fourth sidewall (3313).

16. The permanent magnet synchronous motor according to any one of claims 1-3, characterized in that, The permanent magnet synchronous motor also includes a filler (400). The filler (400) is connected to the head-to-tail position of the magnet array assembly (200).

17. The permanent magnet synchronous motor according to claim 16, characterized in that, The filler (400) is a soft magnetic filler.

18. The permanent magnet synchronous motor according to claim 16, characterized in that, The central angle θ6 of the filler (400) satisfies the following condition: θ6= ; Where s satisfies the following condition: s=6p; p is the number of the magnet groups (210), and p is a positive even number greater than or equal to 2.

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