Electric machines and electric machine arrangements

Abstract

The application discloses a motor and a motor device, and relates to the technical field of machinery, wherein the motor comprises a motor rotating shaft, a rotor disc fixed to the motor rotating shaft, the rotor disc having opposite first and second surfaces, a positioning groove arranged on at least one surface of the rotor disc, and an integrated multi-pole magnetic ring embedded in the positioning groove and fixedly connected with the rotor disc. The multi-pole magnetic ring is magnetized along the axial direction, and forms multiple pairs of magnetic poles which are alternately distributed along the circumferential direction. The integrated multi-pole magnetic ring is used for assembly and magnetization, the size discreteness caused by the magnet blocks is eliminated, the flatness of the rotor magnet, the size precision and the uniformity of the magnetic field are improved, and meanwhile, the production process is simplified and the assembly efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, and in particular to an electric motor and motor equipment. Background Technology

[0002] Axial flux motors, due to their compact structure and high power density, have shown broad application prospects in new energy vehicles, aerospace, and high-efficiency industrial drives. Currently, the rotor magnets of surface-mount axial flux motors are attached piece by piece to the rotor; for example, a 10-pole motor requires 20 pieces. This approach is cumbersome and time-consuming during production and assembly. Furthermore, the piecewise magnets lead to uneven magnetic field distribution, affecting motor performance. Finally, the piecewise magnets make it difficult to guarantee consistency, resulting in poor rotor magnet flatness and ultimately uneven air gap along the motor axis, causing motor failure. Utility Model Content

[0003] The main purpose of this invention is to propose a motor and motor equipment that aims to solve the problem of insufficient dimensional accuracy and uniformity of existing rotor magnets.

[0004] To achieve the above objectives, this application proposes an electric motor, comprising:

[0005] Motor shaft;

[0006] A rotor disk is fixed to the motor shaft, and the rotor disk has a first surface and a second surface opposite to each other.

[0007] A positioning groove is provided on at least one surface of the rotor disk;

[0008] A multi-pole magnetic ring is disposed in the positioning groove and fixedly connected to the rotor disk. The multi-pole magnetic ring is an integrated structure and is magnetized along the axial direction to form multiple pairs of alternating magnetic poles.

[0009] In one embodiment, the motor shaft includes:

[0010] Shaft body;

[0011] A connecting part is disposed on the outer wall of the shaft body and is integrally formed with the shaft body;

[0012] The rotor disc is sleeved on the shaft body and fixedly connected to the connecting part.

[0013] In one embodiment, the rotor disk has an annular structure, comprising:

[0014] The mounting part is located on the inner circumference of the rotor disk. The mounting part is attached to the connecting part and fixedly connected to the connecting part by fasteners.

[0015] In one embodiment, the positioning groove is an annular structure and is disposed on the outer periphery of the rotor disk, and the positioning groove, the rotor disk and the shaft body coincide at the same point.

[0016] In one embodiment, the positioning groove is matched with the side of the multipole magnetic ring facing the rotor disk, and the positioning groove and the axis of the multipole magnetic ring coincide at the same point.

[0017] In one embodiment, the multiple pairs of magnetic poles are N poles and S poles that are equidistantly and alternately distributed, and the width of the non-magnetic region between adjacent magnetic poles is consistent.

[0018] In one embodiment, both the first surface and the second surface are provided with positioning grooves, and the positioning grooves on the first surface and the second surface are symmetrically distributed along the central axis of the rotor disk thickness direction.

[0019] In one embodiment, the multipole magnetic ring includes:

[0020] The upper magnetic ring is fixed in the positioning groove of the first surface;

[0021] The lower magnetic ring is fixed in the positioning groove on the second surface;

[0022] The upper and lower magnetic rings are both integrated ring magnets, and the inner and outer radii of the upper magnetic ring are the same as those of the lower magnetic ring.

[0023] In one embodiment, the magnetic poles of each upper magnetic ring are aligned along the axial direction with the magnetic poles of each lower magnetic ring, and their polarities are opposite.

[0024] In addition, to achieve the above objectives, this application also proposes an electric motor device, including the aforementioned electric motor.

[0025] This application relates to an electric motor, comprising: a motor shaft; a rotor disk fixed to the motor shaft, the rotor disk having opposing first and second surfaces; a positioning groove formed on at least one surface of the rotor disk; and an integrated multi-pole magnetic ring embedded in the positioning groove and fixedly connected to the rotor disk. The multi-pole magnetic ring is magnetized axially to form multiple pairs of magnetic poles alternately distributed along the circumferential direction. By using an integrated multi-pole magnetic ring for assembly and magnetization, the dimensional dispersion caused by the segmentation of magnets is eliminated, thereby improving the flatness, dimensional accuracy, and magnetic field uniformity of the rotor magnets, while simplifying the production process and improving assembly efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is an internal structural diagram of an embodiment of the motor of this utility model;

[0028] Figure 2 This is an external structural diagram of an embodiment of the motor of this utility model;

[0029] Figure 3 This is a top view of an embodiment of the motor of the present invention;

[0030] Figure 4 This is a side view of an embodiment of the motor of this utility model.

[0031] Reference numerals in the attached figures: motor shaft 01, shaft body 11, connecting part 12, rotor disk 02, mounting part 21, positioning groove 03, multi-pole magnetic ring 04, upper magnetic ring 41, lower magnetic ring 42.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This application proposes an electric motor, such as Figure 1 and Figure 2 As shown, it includes: a motor shaft 01; a rotor disk 02 fixed to the motor shaft 01, the rotor disk 02 having a first surface and a second surface opposite to each other; a positioning groove 03 disposed on at least one surface of the rotor disk 02; and a multi-pole magnetic ring 04 disposed in the positioning groove 03 and fixedly connected to the rotor disk 02, the multi-pole magnetic ring 04 being an integral structure and magnetized along the axial direction to form multiple pairs of alternating magnetic poles.

[0037] More specifically, axial flux motors, with their significant advantages of compact structure and high power density, are increasingly becoming a highly promising power solution in cutting-edge fields such as new energy vehicles, aerospace, and high-efficiency industrial drives. Currently, the rotor structure of widely used surface-mount axial flux motors typically uses a segmented bonding method to fix the permanent magnets to the rotor core surface. For example, a 10-pole motor requires a total of 20 individual magnets to be precisely bonded to both sides or one side of the rotor. This traditional process has revealed several drawbacks in practical applications. First, in the production and assembly stage, each magnet needs to be individually positioned, glued, and bonded, making the operation extremely cumbersome, time-consuming, and labor-intensive, severely restricting the efficiency and cost control of large-scale production.

[0038] Secondly, the segmented design of the magnets inherently introduces defects in the magnetic field distribution. Due to unavoidable physical gaps between the magnet sheets and slight differences in the magnetization characteristics of each magnet, the resulting magnetic field waveform on the rotor surface is not ideal, leading to increased harmonic content and waveform distortion, directly weakening the motor's electromagnetic performance and operating efficiency. Furthermore, the structural problems caused by segmented magnets are particularly prominent. It is difficult to guarantee absolutely consistent height and installation precision during the manufacturing and assembly of numerous independent magnet sheets. Combined with potential slight deformation differences in the materials themselves, this results in poor overall flatness of the rotor's magnet working surface. This flatness deviation is directly transmitted to the crucial axial air gap of the motor, causing unevenness along the circumferential direction. This uneven air gap not only exacerbates further magnetic field distortion but also introduces significant electromagnetic vibration and noise. More seriously, it may cause rotor rubbing or even failure during high-speed or high-load operation, threatening operational reliability and lifespan.

[0039] The core idea for solving these problems lies in finding a unified or quasi-unified magnet structure solution that can replace the modular pasting. Currently, a common compromise is to improve the manufacturing process of the modular magnets, such as using in-mold injection molding technology to pre-embed multiple magnets into a plastic frame to form a single module before assembly. This method simplifies the assembly process to some extent, improves production efficiency and the consistency of magnet placement, and also helps improve flatness. However, it does not fundamentally solve the problem of the physical modularity of the magnets; gaps still exist between the magnet blocks, and the uneven distribution of the magnetic field, as well as the resulting harmonics and potential vibration noise, cannot be completely eliminated.

[0040] Furthermore, the most intuitive idea is to use a single, complete ring magnet fitted onto the rotor. This would fundamentally eliminate gaps between sections, simplify assembly, and ensure the uniformity of the magnetic field and the high flatness of the rotor surface. However, realizing a monolithic magnetic ring faces significant technical bottlenecks. For high-performance motors, which commonly use sintered neodymium iron boron and other highly conductive permanent magnet materials, a solid, continuously conductive magnetic ring would induce huge eddy currents within the motor during operation. These eddy currents not only cause severe energy loss and significantly reduce motor efficiency, but can also irreversibly damage the magnet itself due to overheating, making the monolithic magnetic ring solution technically impractical.

[0041] Therefore, this application proposes a motor, including a motor shaft 01, a rotor disk 02, and a multi-pole magnetic ring 04, the multi-pole magnetic ring 04 being an integrated structure. The rotor disk 02 is fixed to the motor shaft 01 and has opposing first and second surfaces. As a symmetrical disc structure, the rotor disk 02's first and second surfaces can face both sides of the stator core, or one surface can face only one side of the stator. The core function of this component is to construct the physical basis for magnetic circuit conduction, guiding magnetic flux axially through the air gap using a high-permeability material, minimizing magnetic circuit resistance. A positioning groove 03 is provided on at least one surface of the rotor disk 02, providing precise radial and circumferential constraints for the overall magnetic ring, preventing centrifugal displacement under high-speed rotation. Compared to the independent bonding surfaces of segmented magnets, a single annular contact surface significantly reduces assembly accumulation errors, ensuring the axial parallelism of the magnetic ring's working plane to the stator core, fundamentally solving the problem of uneven air gap.

[0042] A multi-pole magnetic ring 04 is disposed within the positioning groove 03 and fixedly connected to the rotor disk 02. The multi-pole magnetic ring 04 is an integrated structure, and is magnetized axially to form alternating pairs of magnetic poles. The multi-pole magnetic ring 04 is a physically single continuous ring body, and through axial magnetization technology, alternating N / S magnetic poles (e.g., 10 pairs of poles corresponding to 20 magnetic pole regions) are directly formed on the ring body. This fundamentally eliminates the assembly gap between traditional segmented magnets, ensuring the high sinusoidal nature of the magnetic field distribution and the mechanical continuity of the rotor surface, thereby improving the air gap uniformity. The integrated structure of the magnetic ring does not mean continuous conduction of the electromagnetic circuit. Axial magnetization causes the magnetic lines of force to mainly pass through the air gap and enter the stator axially, and the magnetic circuits of adjacent magnetic poles inside the magnetic ring are naturally isolated radially. Because the magnetic ring is processed and assembled as a whole, the flatness of the magnetic ring can be achieved with high precision, and the flatness of the rotor magnet surface after assembly can also achieve high precision. This ensures that the air gap of the subsequent motor can achieve the required dimensional accuracy and uniformity, improving the yield rate of motor production.

[0043] This application relates to an electric motor, comprising: a motor shaft 01; a rotor disk 02 fixed to the motor shaft 01, the rotor disk 02 having opposing first and second surfaces; a positioning groove 03 formed on at least one surface of the rotor disk 02; and an integrated multi-pole magnetic ring 04 embedded in the positioning groove 03 and fixedly connected to the rotor disk 02. The multi-pole magnetic ring 04 is magnetized axially to form multiple pairs of magnetic poles alternately distributed along the circumferential direction. The unavoidable dimensional tolerances during the manufacturing process of segmented magnets can lead to poor overall flatness and difficulty in ensuring dimensional accuracy of the assembled rotor magnet assembly, thus affecting the uniformity of the final magnetic field. This application, by adopting an integrated magnetic ring, completely eliminates the dimensional errors accumulated from the assembly of multiple parts, thereby significantly improving the flatness of the rotor magnet mounting end face, ensuring higher dimensional accuracy, and achieving a more uniform and stable circumferential magnetic field distribution. Simultaneously, by eliminating the cumbersome processes of magnet segmentation, positioning, bonding, or fastening, the entire production process is effectively simplified, improving the efficiency of the magnet assembly process and reducing manufacturing costs.

[0044] In one embodiment, such as Figure 1 As shown, the motor shaft 01 includes:

[0045] Shaft 11; connecting part 12, disposed on the outer wall of the shaft 11 and integrally disposed with the shaft 11; wherein, the rotor disk 02 is sleeved on the outside of the shaft 11 and fixedly connected to the connecting part 12.

[0046] The motor shaft 01 can be understood as consisting of a shaft body 11 and a connecting part 12. The shaft body 11 is the core foundation of the motor shaft 01, primarily playing a crucial role in supporting and transmitting torque. During motor operation, the weight of the rotor disc 02 and other related components, as well as the centrifugal force generated during rotation, all need to be borne and transmitted through the shaft body 11. When the motor is powered on, the rotor generates rotational power, which the shaft body 11 efficiently and stably transmits to subsequent mechanical structures, such as gears, thereby driving the entire mechanical system and realizing the motor's driving function. The connecting part 12 is located on the outer wall of the shaft body 11 and is integrally formed with it. Its main function is to achieve a secure connection between the rotor disc 02 and the shaft body 11. During motor manufacturing, the connecting part 12 may employ connection methods such as keyway fit or interference fit to ensure no relative rotation between the rotor disc 02 and the shaft body 11. When the motor is working, the rotor disk 02 rotates under the influence of the magnetic field. The torque is accurately transmitted to the shaft 11 through the connecting part 12, which in turn drives the shaft 11 and other connected components to rotate together. This ensures the overall transmission efficiency and synchronous operation of the motor, avoids slippage or loosening between the rotor disk 02 and the shaft 11, and enables the motor to operate reliably and stably.

[0047] The rotor disk 02 is fitted onto the outside of the shaft 11 through a central hole, and its inner side forms a tight fit with the connecting part 12. When the motor starts, the current generates a rotating magnetic field in the stator. This magnetic field acts on the rotor disk 02 fixed to the connecting part 12, causing the rotor disk 02 to rotate. Since the rotor disk 02 is firmly fixed to the connecting part 12, and the connecting part 12 is an integral part of the shaft 11, the rotation of the rotor disk 02 forcibly and synchronously drives the connecting part 12 and the shaft 11 to rotate together. The shaft 11, as the final support and output component, stably supports the rotational motion and torque generated by the rotor disk 02 on the bearings, and efficiently transmits the power to the external load through its extended end. In this process, the connecting part 12 plays a crucial "link" role, ensuring rigid and slip-free power transmission between the rotor disk 02 and the shaft 11. The entire system works in concert to achieve the conversion and output of electrical energy into mechanical energy.

[0048] In one embodiment, such as Figure 3 As shown, the rotor disk 02 has an annular structure and includes:

[0049] The mounting part 21 is disposed on the inner circumference side of the rotor disk 02. The mounting part 21 is attached to the connecting part 12 and fixedly connected to the connecting part 12 by fasteners.

[0050] In this embodiment, the rotor disk 02 is designed as a ring structure, its core function being to efficiently support the magnets and transmit power. It includes a key mounting portion 21 and a cooperating connecting portion 12, which together form the connection hub between the rotor and the drive shaft. As described in the above embodiment, the connecting portion 12 is a radially protruding structure integrally manufactured with the shaft 11, directly converting the torque borne by the shaft 11 into a driving force on the rotor disk 02. The mounting portion 21 is directly located on the inner circumference of the annular structure of the rotor disk 02, forming a structural area specifically for docking and fixing. The mounting portion 21 provides a robust and easily assembled connecting surface, the shape of which must match and fit snugly with the connecting portion 12 of the motor shaft 01, ensuring that the two components can automatically or through fine-tuning achieve a high degree of coaxiality when joined, i.e., the center of the rotor disk 02 precisely coincides with the centerline of the drive shaft. Simultaneously, this contact surface is also the main load-bearing surface for transmitting torque; the electromagnetic driving torque received by the rotor disk 02 acts directly on the drive shaft through this contact surface.

[0051] Fasteners, such as screws, are the core components that achieve and maintain a firm, immovable connection between the mounting portion 21 and the connecting portion 12. The fasteners apply a strong locking force, pressing and rigidly fixing the mounting portion 21 and connecting portion 12 together, which were originally just touching. This force overcomes the enormous centrifugal force, electromagnetic torque, and possible vibrations generated during motor operation, preventing any relative slippage, torsion, or separation between the rotor disk 02 and the drive shaft. The locking principle relies on generating sufficient static friction or mechanical interlocking to ensure that power can be transmitted from the drive shaft through the contact surface to the rotor disk 02 and the magnet assembly it supports, maintaining high structural stability and positional accuracy throughout the rotation process.

[0052] In one embodiment, the positioning groove 03 is an annular structure and is disposed on the outer periphery of the rotor disk 02. The positioning groove 03, the rotor disk 02 and the shaft body 11 coincide at the same point.

[0053] This can be understood as the positioning groove 03, rotor disk 02, and shaft 11 all coinciding at the same point. This design ensures precise alignment and stable operation of the motor's internal structure. The positioning groove 03 is designed as a ring structure and is located on the outer periphery of the rotor disk 02. Its main function is to provide a precise installation position and fixed support for the magnets. The magnets are glued to the positioning groove 03 of the rotor disk 02. The ring structure allows the magnets to be evenly arranged on the outer periphery of the rotor disk 02, thereby forming a uniform magnetic field. The ring design of the positioning groove 03 also ensures that the magnets can be precisely aligned during installation, avoiding eccentricity or vibration during rotation, thus improving the smoothness and efficiency of motor operation.

[0054] The positioning slot 03, rotor disk 02, and shaft 11 are aligned at the same point, ensuring precise alignment and coordinated operation of all internal components of the motor. The positioning slot 03 provides a precise mounting position for the magnet, the rotor disk 02 supports the magnet and forms a uniform magnetic field, and the shaft 11 supports the entire rotor system and transmits power. This precise alignment reduces eccentric forces and vibrations during rotation, improving the motor's operating efficiency and stability. Furthermore, this design facilitates motor manufacturing and assembly, improving production efficiency and product quality.

[0055] In one embodiment, the positioning groove 03 is matched with the side of the multipole magnetic ring 04 facing the rotor disk 02, and the positioning groove 03 and the axis of the multipole magnetic ring 04 coincide at the same point.

[0056] This can be understood as the positioning slot 03 being matched with the side of the multi-pole magnetic ring 04 facing the rotor disk 02, ensuring accurate alignment of the multi-pole magnetic ring 04 during installation. This matching not only guarantees the stability of the multi-pole magnetic ring 04 on the rotor disk 02 but also prevents the magnetic ring from shifting or wobbling during rotation, thereby improving the smoothness and reliability of motor operation. Simultaneously, the presence of the positioning slot 03 also facilitates the rapid and accurate assembly of the multi-pole magnetic ring 04 during manufacturing, improving production efficiency and assembly precision.

[0057] The multi-pole magnetic ring 04 is positioned to match the positioning groove 03 on the side facing the rotor disk 02, ensuring a tight fit between the ring and the disk. Its axis is aligned with the axes of the rotor disk 02 and the shaft 11. This design guarantees a uniform magnetic field distribution, allowing the rotor to experience a stable magnetic force during rotation, thereby improving the motor's torque output and operating efficiency. The magnetic field of the multi-pole magnetic ring 04 interacts with the magnetic field generated by the stator windings, driving the rotor to rotate and realizing the motor's energy conversion function.

[0058] In one embodiment, the multiple pairs of magnetic poles are N poles and S poles that are equidistantly and alternately distributed, and the width of the non-magnetic region between adjacent magnetic poles is consistent.

[0059] The equidistant alternating distribution of magnetic poles generates a uniform and symmetrical magnetic field. During motor operation, the stator windings are energized to produce a rotating magnetic field, which the rotor poles must precisely align with. The equidistant alternating N and S poles ensure the spatial regularity and symmetry of the magnetic field, enabling the rotor to generate a uniform and stable electromagnetic torque during rotation. This helps improve the motor's operating efficiency and the stability of its power output, avoiding vibration and noise caused by uneven magnetic fields.

[0060] The primary function of the non-magnetic region is to isolate adjacent magnetic poles, preventing interference between their magnetic fields. The uniform width of the non-magnetic region ensures the clarity and stability of the magnetic field. During motor operation, the clear boundary of the magnetic field helps reduce magnetic leakage and improves magnetic field utilization efficiency. Furthermore, this design optimizes the magnetic circuit, resulting in a more uniform magnetic field distribution, further enhancing motor performance and reliability. The equidistant, alternating magnetic poles and the uniformly wide non-magnetic region work together to improve the stability of the motor's torque output, reduce torque fluctuations, and thus achieve smooth motor operation. Simultaneously, this design also helps reduce electromagnetic noise and vibration, improving motor operating efficiency and lifespan.

[0061] In one embodiment, both the first surface and the second surface are provided with positioning grooves 03, and the positioning grooves 03 on the first surface and the second surface are symmetrically distributed along the central axis of the rotor disk 02 in the thickness direction.

[0062] More specifically, in this embodiment, magnets are provided on both sides of the rotor disk 02, such as in a dual-stator single-rotor axial flux motor. An upper magnetic ring 41 and a lower magnetic ring 42 are bonded to the two surfaces of the rotor disk 02. The positioning groove 03 coincides with the axis of the multi-pole magnetic ring 04 at the same point, aligning the magnetic poles of the upper and lower magnetic rings 42 and ensuring a uniform distribution of magnetic flux density. This is beneficial for improving the torque density and efficiency of the motor, enabling it to generate stronger torque during operation while reducing energy loss.

[0063] During motor operation, the magnets on rotor disk 02 form a uniform and symmetrical magnetic field. Due to the symmetrical distribution design of the positioning slots 03, the magnets are evenly arranged on rotor disk 02, with the N and S poles of each magnet alternating to form a continuous magnetic field. This magnetic field interacts with the rotating magnetic field generated by the stator windings, producing electromagnetic torque that drives the rotor to rotate.

[0064] The symmetrically distributed positioning slots 03 and the magnet design help reduce vibration and noise during motor operation. Because the magnets are evenly distributed on the rotor disk 02, the rotor's center of mass coincides with the shaft's axis during rotation, thus reducing unbalanced forces and vibrations during rotation. Simultaneously, the uniform magnetic field distribution also reduces magnetic field fluctuations, lowering electromagnetic noise during motor operation.

[0065] In one embodiment, such as Figure 4 As shown, the multipole magnetic ring 04 includes:

[0066] The upper magnetic ring 41 is fixed in the positioning groove 03 of the first surface; the lower magnetic ring 42 is fixed in the positioning groove 03 of the second surface; wherein the upper magnetic ring 41 and the lower magnetic ring 42 are integrated ring magnets, and the inner and outer radii of the upper magnetic ring 41 are the same as the inner and outer radii of the lower magnetic ring 42.

[0067] This can be understood as follows: during motor operation, the stator windings are energized, generating a rotating magnetic field. The upper magnetic ring 41 and the lower magnetic ring 42 interact with the magnetic fields generated by the upper and lower stator windings, respectively, forming electromagnetic torque. Since the inner and outer radii of the upper magnetic ring 41 and the lower magnetic ring 42 are consistent, the magnetic field is symmetrically distributed in the axial direction, resulting in a uniform distribution of electromagnetic torque in the axial direction. This reduces torque fluctuations and vibrations, improving the smoothness of motor operation. The magnetic poles of the upper and lower magnetic rings 42 are aligned along the axial direction and have opposite polarities, which forms a closed loop in the axial direction, reducing magnetic leakage and improving the utilization efficiency of the magnetic field. This design not only enhances the motor's torque output but also improves energy conversion efficiency and reduces the motor's energy consumption.

[0068] Furthermore, the symmetrical design of the upper magnetic ring 41 and the lower magnetic ring 42 helps optimize the magnetic circuit and reduce the occurrence of magnetic saturation. Magnetic saturation is an important issue in motor design, as it leads to nonlinear changes in magnetic field strength, affecting motor performance. By optimizing the magnetic circuit structure, this design can effectively suppress magnetic saturation and improve the motor's operational stability and reliability.

[0069] In one embodiment, the magnetic poles of each upper magnetic ring 41 are aligned with the magnetic poles of each lower magnetic ring 42 along the axial direction and have opposite polarities.

[0070] The magnetic poles of the upper magnetic ring 41 and the lower magnetic ring 42 are aligned along the axial direction and have opposite polarities, forming a complete magnetic circuit in the axial direction. When current flows through the stator windings, the rotating magnetic field generated by the stator can interact more effectively with the rotor's magnetic field. This interaction enhances the motor's magnetic field utilization efficiency, enabling the motor to generate greater torque and improving energy conversion efficiency. Because the magnetic poles of the upper magnetic ring 41 and the lower magnetic ring 42 are aligned and have opposite polarities, the magnetic field forms a closed loop in the axial direction, reducing magnetic leakage and improving the concentration and uniformity of the magnetic field. This uniform magnetic field distribution helps reduce magnetic field fluctuations, improving the motor's operational smoothness and efficiency. Simultaneously, this design also reduces motor vibration and noise, further enhancing motor performance.

[0071] When current flows through the stator windings, the stator generates a rotating magnetic field. The magnetic poles of the upper magnetic ring 41 and the lower magnetic ring 42 are aligned along the axial direction and have opposite polarities, allowing the rotor's magnetic field to interact effectively with the stator's rotating magnetic field in the axial direction. This interaction generates a strong electromagnetic torque that drives the rotor to rotate. Due to the alignment and opposite polarities of the magnetic fields, the electromagnetic torque is evenly distributed in the axial direction, reducing torque ripple and improving the smoothness of motor operation.

[0072] Based on the above embodiments, this embodiment proposes a dual-stator single-rotor axial flux motor, including a motor shaft 01, a rotor disk 02, an upper magnetic ring 41, and a lower magnetic ring 42. The dual-stator single-rotor axial flux motor is a motor with a dual-stator and single-rotor structure, where the rotor is located between the two stators, and the rotor's rotation axis is perpendicular to the magnetic flux direction of the stators. When current flows through the stator windings, the stator generates a rotating magnetic field, which interacts with the rotor's magnetic poles to produce electromagnetic torque, causing the rotor to rotate. Due to the dual-stator structure, the stator windings simultaneously generate magnetic fields on both axial sides, enhancing the motor's magnetic field effect and improving torque output.

[0073] In this embodiment, the motor shaft 01 is the motor shaft used to output speed and torque. The rotor disk 02 is used to attach magnets and is fixed to the shaft 11 with screws. The upper and lower opposing surfaces of the rotor disk 02 are also provided with two positioning grooves 03. The upper and lower magnetic rings 42 are integral ring magnets, respectively glued to the positioning grooves of the rotor disk 02 with structural adhesive. Due to the function of the positioning grooves 03, the bonding and assembly of the two magnetic rings can achieve a very high degree of concentricity, improving magnetic field uniformity and enhancing motor performance and efficiency. After the shaft 11, rotor disk 02, and upper and lower magnetic rings 42 are assembled, the entire rotor is then magnetized. The magnetizer has 20 magnetic poles pre-defined, and the upper and lower magnetic rings 42 are magnetized simultaneously in the axial direction. The effect after magnetization is as follows: Figure 3 and Figure 4 As shown, the magnetic poles are evenly spaced, increasing the magnetic flux density of the rotor. Furthermore, the magnetic pole heights of the upper and lower magnetic rings 42 are aligned, resulting in a very uniform distribution of magnetic flux density. This significantly contributes to improved motor performance.

[0074] Furthermore, because the magnetic ring is machined and assembled as a whole, its flatness can be achieved with very high precision, and the flatness of the rotor magnet surface after assembly can also reach a very high precision. This ensures that the air gap of the subsequent motor can achieve the required dimensional accuracy and uniformity, improving the yield rate of motor production.

[0075] Furthermore, to achieve the above objectives, this application also proposes a motor device including the aforementioned motor. The motor includes: a motor shaft 01; a rotor disk 02 fixed to the motor shaft 01, the rotor disk 02 having opposing first and second surfaces; a positioning groove 03 disposed on at least one surface of the rotor disk 02; and a multi-pole magnetic ring 04 disposed within the positioning groove 03 and fixedly connected to the rotor disk 02. The multi-pole magnetic ring 04 is an integrated structure and is magnetized axially to form alternating pairs of magnetic poles. The unavoidable dimensional tolerances during the manufacturing process of segmented magnets can lead to poor overall flatness and difficulty in ensuring dimensional accuracy of the assembled rotor magnet assembly, thus affecting the uniformity of the final magnetic field. This application, by employing an integrated magnetic ring, completely eliminates the dimensional errors accumulated from the assembly of multiple parts, thereby significantly improving the flatness of the rotor magnet mounting end face, ensuring higher dimensional accuracy, and achieving a more uniform and stable circumferential magnetic field distribution. At the same time, by eliminating cumbersome processes such as dividing, positioning, bonding or fastening magnets, the entire production process is effectively simplified, improving the efficiency of magnet assembly and reducing manufacturing costs.

[0076] The above embodiments are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An electric motor, characterized in that, include: Motor shaft; A rotor disk is fixed to the motor shaft, and the rotor disk has a first surface and a second surface opposite to each other. A positioning groove is provided on at least one surface of the rotor disk; A multi-pole magnetic ring is disposed in the positioning groove and fixedly connected to the rotor disk. The multi-pole magnetic ring is an integrated structure and is magnetized along the axial direction to form multiple pairs of alternating magnetic poles.

2. The motor as described in claim 1, characterized in that, The motor shaft includes: Shaft body; A connecting part is disposed on the outer wall of the shaft body and is integrally formed with the shaft body; The rotor disc is sleeved on the shaft body and fixedly connected to the connecting part.

3. The motor as described in claim 2, characterized in that, The rotor disk has a ring-shaped structure and includes: The mounting part is located on the inner circumference of the rotor disk. The mounting part is attached to the connecting part and fixedly connected to the connecting part by fasteners.

4. The motor as described in claim 3, characterized in that, The positioning groove is an annular structure and is located on the outer periphery of the rotor disk. The positioning groove, the rotor disk, and the shaft body coincide at the same point.

5. The motor as described in claim 4, characterized in that, The positioning groove is matched with the side of the multi-pole magnetic ring facing the rotor disk, and the positioning groove and the axis of the multi-pole magnetic ring coincide at the same point.

6. The motor as described in claim 1, characterized in that, The magnetic poles are N poles and S poles that are equidistantly and alternately distributed, and the width of the non-magnetic region between adjacent magnetic poles is the same.

7. The motor according to any one of claims 1-6, characterized in that, Both the first surface and the second surface are provided with positioning grooves, which are symmetrically distributed along the central axis of the rotor disk thickness direction.

8. The motor as described in claim 7, characterized in that, The multipole magnetic ring includes: The upper magnetic ring is fixed in the positioning groove of the first surface; The lower magnetic ring is fixed in the positioning groove on the second surface; The upper and lower magnetic rings are both integrated ring magnets, and the inner and outer radii of the upper magnetic ring are the same as those of the lower magnetic ring.

9. The motor as described in claim 8, characterized in that, The magnetic poles of each upper magnetic ring are aligned with the magnetic poles of each lower magnetic ring along the axial direction, and their polarities are opposite.

10. A motor device, characterized in that, Including the motor as described in any one of claims 1-9.

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