Axial flux hub motor based on single-sided magnetizing injection molding of samarium iron nitrogen

Abstract

The invention discloses an axial magnetic flux hub motor based on single-sided magnetizing injection molding of samarium iron nitrogen. The axial magnetic flux hub motor comprises a transversely arranged mandrel; the driving assembly comprises a rotating part and a fixed part, the rotating part and the fixed part are arranged on the outer surface of the mandrel in a sleeving mode, the fixed part is arranged at the center of the outer surface of the mandrel, and a certain distance is formed between the rotating part and the fixed part. Samarium-iron-nitrogen magnetizing injection molding is adopted and arranged on the single face of the rotating part, the overall weight of the motor can be reduced, the single-face magnetizing technology is conducted on magnetizing injection molding of samarium-iron-nitrogen, the using amount of back iron is reduced, meanwhile, the overall weight of the motor can be reduced, rotation of the rotating part is not affected, a tire arranged on the hub cover in a sleeving mode can rotate rapidly, and the service life of the motor is prolonged. The overall weight of the motor is reduced, rotation of tires is not affected, the axial magnetic flux power density is higher than that of a common motor, and the weight of the motor can be further reduced.

Description

Technical Field

[0001] The present invention relates to the field of axial flux hub motors, and in particular to an axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride. Background Art

[0002] Existing hub motors are mainly of the outward-rotating type, requiring a steel ring behind the magnet as a back iron to provide a path for magnetic return. This part of the magnet does not contribute to the torque of the motor and increases the weight. After single-sided magnetization, the magnetism of the magnet is concentrated on the air gap side, and there is no need for a magnetic circuit behind it. From this, it can be concluded that on the one hand, the motor output can be increased, and the weight can be further reduced without the use of a back iron. On the other hand, existing micro-mobility vehicle motors mostly use sintered NdFeB, which is a brittle material. When used as an outward-rotating motor, a structure needs to be added to prevent the magnet from being brittle and cracked under stress. Therefore, there is a need for an axial flux hub motor based on single-sided magnetized injection-molded SmFeN. Summary of the Invention

[0003] The purpose of the present invention is to provide an axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride to solve the problem of excessive weight of the current overall motor.

[0004] To achieve this object, the present invention adopts the following technical solutions: An axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride, comprising: a transversely disposed mandrel; The driving assembly includes a rotating part and a fixed part which are sleeved on the outer surface of the spindle. The fixed part is arranged at the center position of the outer surface of the spindle, and the rotating part is located on one side of the fixed part. A certain distance is set between the rotating part and the fixed part.

[0005] Furthermore, the fixed portion and the rotating portion are both configured as disc structures, and the diameter of the rotating portion is greater than the diameter of the fixed portion.

[0006] Furthermore, a side of the rotating part close to the fixed part is configured to be magnetized injection-molded samarium iron nitride.

[0007] Furthermore, the outer surface of the stator is provided with a plurality of openings along its own central ring shape, and the locations where the openings are provided on the outer surface of the stator are provided with windings.

[0008] Furthermore, the middle portion of the core shaft is a cylindrical structure, bolt holes are provided at both ends of the core shaft, and the two ends of the core shaft are configured as irregular structures.

[0009] Furthermore, bearings are rotatably connected to the exterior of the spindle at positions near both sides, and a hub cover is provided on the exterior of one of the bearings, and the hub cover is wrapped around the drive assembly.

[0010] Furthermore, the cross section of the hub cover is a transversely arranged U-shaped structure, and the inner wall of the circular ring of the hub cover is connected to the outside of the rotating part.

[0011] Furthermore, an end cover is provided on the outside of one of the bearings, and the end cover is connected to one side of the opening of the hub cover, and the hub cover and the end cover form a horizontally arranged cylindrical structure as a whole.

[0012] Furthermore, one side of the inner wall of the hub cover and the end cover at the position of the bearing protrudes toward the bearing to form a circular ring, and the two circular rings are respectively mounted on the outside of the two bearings. Rotary holes are opened on one side of the hub cover and the end cover at the position of the bearing, and the two ends of the central shaft pass through the two rotary holes respectively.

[0013] Furthermore, a tire is sleeved on the exterior of the hub cover and the end cover.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the spindle and drive assembly, the magnetized injection-molded samarium iron nitride can be used as the structure of the rotor and arranged on a single side of the rotor, which can reduce the overall weight of the motor. The single-sided magnetization technology is performed on the magnetized injection-molded samarium iron nitride to reduce the amount of back iron. At the same time, it can also reduce the overall weight of the motor without affecting the rotation of the rotor, so that the tire mounted on the hub cover can rotate quickly, achieving the goal of reducing the overall weight of the motor while not affecting the rotation of the tire. In addition, the axial magnetic flux power density is higher than that of ordinary motors, which can further reduce the weight of the motor.

[0015] 2. The hub cover is connected to the rotor through the bearing and the hub cover, and the bearing supports the hub cover so that the rotor rotates on the central shaft and drives the hub cover to rotate. That is, after the stator is energized, the magnetic field generated by the stator interacts with the magnetic field of the rotor to generate a torque, causing the rotor to rotate along the central shaft, thereby achieving the effect of motor rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0018] Figure 1 It is a schematic diagram of the overall front cross-section; Figure 2 It is a three-dimensional schematic diagram of the drive component; Figure 3 It is the overall front view diagram; Figure 4 It is a schematic diagram of the overall side.

[0019] Illustration: 1. Spindle; 2. Rotating part; 3. Fixed part; 4. Bearing; 5. Hub cover; 6. End cover; 7. Tire. DETAILED DESCRIPTION

[0020] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] The embodiment of the present invention provides an axial flux hub motor based on single-sided magnetized injection molded samarium iron nitride. Figure 1-Figure 4, including: a transversely arranged spindle 1 and a driving assembly, the driving assembly includes a rotating part 2 and a fixed part 3 sleeved on the outer surface of the spindle 1, the fixed part 3 is located at the center of the outer surface of the spindle 1, the rotating part 2 is located on one side of the fixed part 3, and a certain distance is set between the rotating part 2 and the fixed part 3. The side of the rotating part 2 close to the fixed part 3 is set to magnetized injection molded samarium iron nitride.

[0024] like Figure 1-Figure 4 As shown, the spindle 1 serves as the core supporting component of the entire axial flux hub motor, providing an installation basis for other components and ensuring the relative position stability of each component during the operation of the motor. The horizontal setting conforms to the structural characteristics of the axial flux motor and is beneficial to the axial distribution of the magnetic field inside the motor and the transmission of force.

[0025] The rotor 2 and the stator 3 are key components of the motor for achieving energy conversion and power output. The stator 3 is usually used to generate a fixed magnetic field, that is, the stator 3 can be fixed on the outside of the core shaft 1. The rotor 2 rotates under the action of the magnetic field of the stator 3, thereby realizing the conversion of electrical energy into mechanical energy. The stator 3 is set at the center position of the outer surface of the core shaft 1, which is conducive to the uniform distribution of the magnetic field inside the motor, so that the rotor 2 is subjected to a relatively stable magnetic field force during the rotation process, thereby improving the running stability and efficiency of the motor.

[0026] The distance between the rotor 2 and the stator 3 is to avoid physical contact and friction between the two during the operation of the motor, reduce energy loss and wear, and at the same time, the magnetic field can be concentrated between the two, so that the rotor 2 improves the rotation efficiency.

[0027] Magnetized injection-molded SmFeN (SmFeN) is a high-performance permanent magnet material with the advantages of high remanence, high coercive force and high magnetic energy product. The side of the rotor 2 close to the stator 3 is set to magnetized injection-molded SmFeN. The permanent magnetic properties of SmFeN are used to form a stable magnetic field in the rotor 2. When the stator 3 is energized to generate a magnetic field, the SmFeN permanent magnet of the rotor 2 interacts with the magnetic field of the stator 3 to generate torque, driving the rotor 2 to rotate. At the same time, the rust-proof and high-temperature resistant properties of magnetized injection-molded SmFeN can improve the local demagnetization phenomenon of the Halbach array itself caused by the high temperature and its own characteristics of the motor. Injection-molded SmFeN can solve the pain points of repulsion and axial motor structure concentricity / roundness when the Halbach array magnets are arranged, improve manufacturability, and magnetized injection-molded SmFeN has strength and toughness, and can be used as a structural part to reduce the weight and size of the motor.

[0028] The rotor 2 is magnetized by injection-molded samarium iron nitride. Single-sided magnetization concentrates the magnetic force on the air gap side, reducing the amount of back iron required for the back magnetic circuit. The magnetic field on the air gap side and the stator 3 generate thrust, giving the motor torque output.

[0029] Specific operation process: When the motor is connected to the power supply, the winding on the stator 3 is energized. According to the principle of electromagnetic induction, the stator 3 generates a rotating magnetic field. The magnetic lines of force of this rotating magnetic field pass through the gap between the rotor 2 and the stator 3, and interact with the permanent magnetic field formed by the magnetized injection-molded samarium iron nitride on the rotor 2. Due to the interaction force between the magnetic fields, the rotor 2 will be subjected to a torque and start to rotate around the central axis 1. As the rotating magnetic field of the stator 3 continues to change, the rotor 2 will continue to be subjected to the torque, thereby maintaining stable rotational motion.

[0030] See also Figure 1 and Figure 2 The stator 3 and the rotor 2 are both set to disc structures. The diameter of the rotor 2 is larger than that of the stator 3. The outer surface of the stator 3 is provided with multiple openings along its own center ring. The positions where the openings are opened on the outer surface of the stator 3 are set to windings.

[0031] like Figure 1 and Figure 2 As shown, the disc shape is conducive to the stator 3 generating a magnetic field when it is energized, so that the magnetic field is relatively evenly distributed in its circumferential direction. This uniform magnetic field distribution can provide a stable force for the rotor 2, reduce the vibration and noise caused by the uneven magnetic field, and improve the stability of the motor operation.

[0032] When the winding is arranged on the outer surface of the stator 3, the disc structure provides convenient conditions for the annular arrangement of the winding. The winding can be evenly wound along the circumferential direction of the stator 3, so that the magnetic field generated when the current flows in the winding can better interact with the rotor 2, thereby improving the energy conversion efficiency of the motor.

[0033] The rotor 2 also adopts a disc structure, which can form a good match with the magnetic field generated by the stator 3. When the magnetic field of the stator 3 changes, the disc shape of the rotor 2 can make its various parts simultaneously affected by the magnetic field force, thereby generating a larger torque and improving the power output capacity of the motor. Since the side of the rotor 2 close to the stator 3 is set to magnetized injection-molded samarium iron nitride, the disc structure provides a flat surface for the installation and fixation of permanent magnetic materials. The injection molding process can evenly attach the samarium iron nitride material to the surface of the rotor 2, ensuring the stability and consistency of the permanent magnetic field. In addition, the diameter of the rotor 2 is larger than that of the stator 3, which can ensure that the rotor 2 is convenient for subsequent contact with the hub cover 5 to prevent the hub cover 5 from colliding with the stator 3.

[0034] See also Figure 1-Figure 4 The middle part of the mandrel 1 is a cylindrical structure, bolt holes are opened at both ends of the mandrel 1, and the two ends of the mandrel 1 are set as irregular structures.

[0035] like Figure 1-Figure 4As shown, the central portion of the cylindrical spindle 1 provides a stable and regular installation base for the drive assembly (rotating part 2 and fixed part 3).

[0036] The main function of the bolt hole is to install and fix other components. By inserting bolts and other connectors into the bolt hole, the spindle 1 can be firmly connected to other structures outside the motor to ensure the integrity of the entire motor structure. At the same time, the bolt hole can also be used to install some auxiliary components, such as sensors, etc., to facilitate the monitoring and control of the operating status of the motor. Wires can also be set to connect to the stator 3 to facilitate the power supply to the stator 3.

[0037] The irregularly structured ends of the spindle 1 can increase the contact area and friction force of other structures outside the motor, thereby improving the firmness of the connection.

[0038] See also Figure 1 and Figure 2 The outer side of the spindle 1 is rotatably connected to the positions near both sides. A hub cover 5 is provided on the outside of one of the bearings 4. The hub cover 5 is wrapped around the drive assembly. The cross-section of the hub cover 5 is a transversely arranged U-shaped structure. The inner wall of the circular ring of the hub cover 5 is connected to the outside of the rotating part 2. An end cover 6 is provided on the outside of one of the bearings 4. The end cover 6 is connected to one side of the opening of the hub cover 5. The hub cover 5 and the end cover 6 form a transversely arranged cylindrical structure as a whole.

[0039] like Figure 1 and Figure 2 As shown, the bearing 4 plays a key role in supporting the hub cover 5 and the end cover 6 and reducing their rotational friction. The spindle 1 serves as the installation base for the motor rotor 2, the hub cover 5 and the end cover 6. When the motor is running, the rotation of the rotor 2 can drive the hub cover 5 and the end cover 6 to rotate at high speed.

[0040] The hub cover 5 provides a closed protective space for the drive assembly (including the rotating part 2 and the stator 3). It can prevent external dust, moisture, debris, etc. from entering the interior of the motor, avoiding these substances from causing damage to the motor's windings, magnetic materials and other components, such as causing winding short circuits and degradation of magnetic material performance.

[0041] The U-shaped hub cover 5 has good mechanical strength and rigidity, and can withstand certain external forces and vibrations. At the same time, this structure can be easily connected and installed with other components of the motor, and provides sufficient accommodation space for the internal drive components. The outside of the rotating part 2 is connected to the inner wall of the hub cover 5, and the rotational motion of the rotating part 2 is transmitted to the hub cover 5, thereby driving the tire 7 and other components connected to the hub cover 5 to rotate, realizing the power output function of the motor. At the same time, the connection also plays a certain role in fixing and supporting the rotating part 2, thereby enhancing the stability of the rotating part 2 during the rotation process.

[0042] Moreover, the cylindrical structure is compatible with the overall design and operation requirements of the motor. It can better accommodate and protect the internal drive components and provide a suitable space and shape for the installation of external components such as the tire 7. At the same time, the cylindrical structure has good uniformity when subjected to external forces, can disperse stress, and improve the strength of the structure.

[0043] Please continue reading Figure 1 and Figure 2 One side of the inner wall of the hub cover 5 and the end cover 6 is located at the position of the bearing 4 and protrudes toward the bearing 4 to form a ring. The two rings are respectively sleeved on the outside of the two bearings 4. One side of the hub cover 5 and the end cover 6 is located at the position of the bearing 4 and has a rotary hole. The two ends of the spindle 1 pass through the two rotary holes respectively.

[0044] like Figure 1 and Figure 2 As shown, the ring can accurately define the position of the bearing 4 in the hub cover 5 and the end cover 6, preventing the bearing 4 from moving axially and radially during the operation of the motor, ensuring that the bearing 4 is always in the correct installation position, thereby ensuring the relative position accuracy between the motor rotor 2 and the stator 3, making the magnetic field distribution of the motor stable and running smoothly.

[0045] The tight fitting of the ring and the bearing 4 increases the connection strength between the hub cover 5, the end cover 6 and the bearing 4, making them form a more stable whole. When the motor is subjected to large external forces or is frequently started and stopped, it can ensure that the components will not loosen or separate, thereby ensuring the normal operation of the motor.

[0046] The rotating hole provides a precise installation position for the spindle 1, so that the spindle 1 can be stably set between the hub cover 5 and the end cover 6. The spindle 1 serves as the installation basis for the motor rotating part 2 and the fixed part 3. Its stable support and positioning are crucial to ensuring the overall structure and operating accuracy of the motor.

[0047] See also Figure 1 、 Figure 3 and Figure 4 A tire 7 is provided on the outside of the hub cover 5 and the end cover 6.

[0048] like Figure 1 、 Figure 3 and Figure 4 As shown, the tire 7 is mainly mounted on the outer ring of the hub cover 5, and wrapped around the outside of the hub cover 5 and the end cover 6 on both sides, so that the tire 7 can roll normally during the rotation of the motor, and the hub cover 5 and the end cover 6 can be connected by structures such as bolts.

[0049] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride, characterized in that: include: A transversely disposed spindle (1); A driving assembly comprises a rotating part (2) and a fixed part (3) which are sleeved on the outer surface of a spindle (1); the fixed part (3) is arranged at the center of the outer surface of the spindle (1); the rotating part (2) is located on one side of the fixed part (3); and a certain distance is provided between the rotating part (2) and the fixed part (3).

2. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 1 is characterized in that: The fixed portion (3) and the rotating portion (2) are both configured as disc structures, and the diameter of the rotating portion (2) is larger than the diameter of the fixed portion (3).

3. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 1, characterized in that: A side of the rotating part (2) close to the fixed part (3) is configured as magnetized injection-molded samarium iron nitride.

4. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 1, characterized in that: The outer surface of the stator (3) is provided with a plurality of openings along its own central ring shape, and the locations where the openings are provided on the outer surface of the stator (3) are provided with windings.

5. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 1, characterized in that: The middle portion of the mandrel (1) is a cylindrical structure, bolt holes are provided at both ends of the mandrel (1), and the two ends of the mandrel (1) are arranged in irregular structures.

6. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 1, characterized in that: The outer portion of the spindle (1) is rotatably connected to bearings (4) at positions near both sides, and a hub cover (5) is provided on the outer portion of one of the bearings (4), and the hub cover (5) is wrapped around the drive assembly.

7. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 6, characterized in that: The cross section of the hub cover (5) is a U-shaped structure arranged transversely, and the inner wall of the circular ring of the hub cover (5) is connected to the outside of the rotating part (2).

8. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 6, characterized in that: An end cover (6) is provided on the outside of one of the bearings (4), and the end cover (6) is connected to one side of the opening of the hub cover (5). The hub cover (5) and the end cover (6) form a horizontally arranged cylindrical structure as a whole.

9. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 8, characterized in that: One side of the inner wall of the hub cover (5) and the end cover (6) is located at the position of the bearing (4) and protrudes toward the bearing (4) to form a ring, and the two rings are respectively sleeved on the outside of the two bearings (4). One side of the hub cover (5) and the end cover (6) is located at the position of the bearing (4) and is provided with a rotating hole, and the two ends of the spindle (1) pass through the two rotating holes respectively.

10. The axial flux hub motor based on single-sided magnetized injection-molded samarium iron nitride according to claim 8, characterized in that: A tire (7) is sleeved on the exterior of the hub cover (5) and the end cover (6).

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