Lightweight magnet structure for two-wheeler drive motor based on bonded neodymium iron boron

Abstract

The utility model discloses a lightweight magnet structure for two -wheeled vehicle drive motor based on bonding neodymium iron boron, including connecting ring and magnet part, this connecting ring installs in the inside of motor, this magnet part sets up in the inboard of connecting ring, this magnet part has the magnetic steel section of setting in the inner wall of connecting ring, the magnetic steel section is connected with the connecting ring through the connecting structure and is fixed through epoxy resin glue, the magnetic steel section has certain camber and is pasted the inner wall of connecting ring, the magnetic steel section is provided with several, and several magnetic steel sections mutually occlude and form annular at the head and tail. The utility model discloses setting up connecting ring and magnet part, can promote the overall strength and stability of magnet structure, make magnetic steel section closely pasted connecting ring inner wall, avoid loose or displacement, optimize the distribution of magnetic circuit simultaneously, improve motor efficiency, the connecting hole of opening in the surface of magnetic steel section can optimize the lightweight design of overall structure and improve the heat dissipation effect of magnetic steel section under the premise of not influencing the magnetic property of magnetic steel section.

Description

Technical Field

[0001] This utility model relates to the field of neodymium iron boron magnet structure technology, specifically a lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded neodymium iron boron. Background Technology

[0002] Bonded NdFeB magnets are composite magnets made by mixing NdFeB magnetic powder with polymer binders (such as epoxy resin, nylon, etc.) and then performing compression molding or injection molding. Compared with traditional bonded NdFeB magnets, bonded NdFeB magnets have unique characteristics in terms of processing, performance, and applications, and are particularly suitable for applications requiring lightweight, complex shapes, and high efficiency, such as magnets inside motors.

[0003] Currently, most two-wheeled vehicle drive motors use bonded neodymium iron boron magnets, which are fixed to the surface of a magnetic ring using epoxy resin adhesive. Specifically, the bonded neodymium iron boron magnets are assembled into a ring, the back of the magnets are coated with adhesive, and then pressed onto the magnetic ring. Two-wheeled vehicle motors are subjected to road vibration and high-speed centrifugal force for a long time, and fatigue cracks are prone to occur at the adhesive bonding interface, leading to magnet detachment. To address this, we propose a lightweight magnet structure for two-wheeled vehicle drive motors based on bonded neodymium iron boron magnets. Utility Model Content

[0004] The purpose of this invention is to provide a lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded neodymium iron boron magnets, in order to solve the problem mentioned in the background art that the two-wheeled vehicle motor is subjected to road vibration and high-speed centrifugal force for a long time, and fatigue cracks are easily generated at the adhesive bonding interface, leading to the detachment of the magnets.

[0005] To solve the above problems, this utility model provides the following technical solution: a lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded neodymium iron boron magnets, comprising a connecting ring and a magnet part: The connecting ring is installed inside the motor, and the magnet part is located inside the connecting ring. The magnet part has a magnetic steel section located on the inner wall of the connecting ring. The magnetic steel section is connected to the connecting ring through a connecting structure and fixed with epoxy resin. The magnetic steel section has a certain curvature and fits the inner wall of the connecting ring. Several magnetic steel sections are provided, and the ends of the several magnetic steel sections interlock with each other to form a ring.

[0006] By adopting the above technical solutions, the overall strength and stability of the magnet structure can be improved, the magnet section can be tightly fitted to the inner wall of the connecting ring to avoid loosening or displacement, and the distribution of the magnetic circuit can be optimized to improve motor efficiency.

[0007] Preferably, the magnet section is integrally injection molded, and the surface of the magnet section is coated with high-temperature resistant nylon after being treated with heat-resistant plastic and additives.

[0008] By adopting the above technical solutions, the mechanical strength, high temperature resistance and corrosion resistance of the magnet joint can be enhanced, ensuring its long-term stability and durability during motor operation, while facilitating mass production and assembly.

[0009] Preferably, the magnet part also has a meshing tooth a disposed on the side of the magnet joint, and a meshing tooth b disposed at the end of the magnet joint away from the meshing tooth a, wherein the meshing tooth a and the meshing tooth b mesh with each other.

[0010] By adopting the above technical solution, a tight connection between multiple magnet sections can be ensured, magnetic circuit loss can be reduced, magnetic field uniformity can be improved, and the overall structure's resistance to torsion can be enhanced to prevent misalignment during high-speed operation.

[0011] Preferably, the edges of the biting teeth a and b are designed with rounded chamfers.

[0012] By adopting the above technical solutions, stress concentration during assembly can be reduced, cracks or wear at the meshing points caused by sharp edges can be avoided, and the service life and reliability of the magnet joint can be improved.

[0013] Preferably, the connecting ring also has a plurality of connectors disposed on the inner wall of the connecting ring, the plurality of connectors having a central rotational symmetry structure around the center of the connecting ring, and each of the connectors being connected to a magnet joint.

[0014] By adopting the above technical solutions, the uniform distribution and precise positioning of the magnet sections can be achieved, ensuring magnetic field symmetry, improving the stability of motor operation, and optimizing the assembly process to reduce manufacturing costs.

[0015] Preferably, the connecting ring also has a locking block at the end of the connector. The locking block has six blocks arranged in a centrally rotationally symmetrical structure around the center of the connector. A circular connecting hole is opened at the center of the magnet section. The locking block is embedded in the connecting hole and engages with the magnet section.

[0016] By adopting the above technical solution, a quick and stable connection between the magnetic steel section and the connecting ring can be achieved, while improving the seismic performance and fatigue resistance of the structure.

[0017] Preferably, the edge of the connecting hole facing the connector has a rounded chamfer design, and the opening size of the connecting hole accounts for 10% of the side cross-section of the magnet section.

[0018] By adopting the above technical solutions, the local impact of stress concentration on the magnet joint can be reduced, the mechanical strength of the magnet can be improved, and the connection holes can be ensured to not affect the magnetic properties of the magnet joint. This also optimizes the lightweight design of the overall structure and improves the heat dissipation effect of the magnet joint.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting a connecting ring and a magnet part, the overall strength and stability of the magnet structure can be improved, the magnet joint can be tightly fitted to the inner wall of the connecting ring to avoid loosening or displacement, and the magnetic circuit distribution can be optimized to improve motor efficiency; the connecting holes opened on the surface of the magnet joint, without affecting the magnetic performance of the magnet joint, help to make the overall structure lightweight and improve the heat dissipation path between the magnet and the external environment, thereby improving the overall reliability of use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the magnet section structure of this application; Figure 3 This is a schematic diagram of the magnet section structure of this application; Figure 4 This is a schematic diagram of the magnetic steel joint connection structure of this application; Figure 5 This is a schematic diagram of the connecting ring structure of this application.

[0021] In the diagram: 1. Connecting ring; 101. Connector; 102. Locking block; 2. Magnet part; 201. Magnet joint; 202. Engaging tooth a; 203. Engaging tooth b; 204. Connecting hole. Detailed Implementation

[0022] 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.

[0023] Example 1: Please refer to Figure 1 , Figure 2 and Figure 3 This embodiment provides a technical solution: a lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded neodymium iron boron magnets, comprising a connecting ring 1 and a magnet part 2. The connecting ring 1 is installed inside the motor, and the magnet part 2 is located inside the connecting ring 1. The magnet part 2 has a magnetic steel section 201 disposed on the inner wall of the connecting ring 1. The magnetic steel section 201 is connected to the connecting ring 1 through a connecting structure and fixed with epoxy resin. The magnetic steel section 201 has a certain curvature and fits the inner wall of the connecting ring 1. Several magnetic steel sections 201 are provided. Several magnetic steel sections 201 interlock with each other to form a ring, which can improve the overall strength and stability of the magnet structure, make the magnetic steel section 201 fit tightly against the inner wall of the connecting ring 1, avoid loosening or displacement, and optimize the distribution of the magnetic circuit to improve the motor efficiency.

[0024] Example 2: Please refer to Figure 3 , Figure 4 and Figure 5 This embodiment provides a technical solution: a lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded neodymium iron boron magnets, comprising a connecting ring 1 and a magnet part 2. The magnet joint 201 is integrally injection molded. The surface of the magnet joint 201 is coated with high-temperature resistant nylon after being treated with high-temperature resistant plastic and additives. This can enhance the mechanical strength, high-temperature resistance and corrosion resistance of the magnet joint 201, ensuring its long-term stability and durability during motor operation, while also facilitating mass production and assembly.

[0025] Engaging teeth a202 are provided on the side of the magnet section 201, and engaging teeth b203 are provided at the end of the magnet section 201 away from the engaging teeth a202. The engaging teeth a202 and b203 engage with each other, which can ensure a tight connection between multiple magnet sections 201, reduce magnetic circuit loss, improve magnetic field uniformity, and enhance the overall structure's resistance to torsion, preventing misalignment during high-speed operation.

[0026] The edges of the meshing teeth a202 and b203 are designed with rounded chamfers, which can reduce stress concentration during assembly, prevent cracks or wear at the meshing point due to sharp edges, and improve the service life and reliability of the magnet joint 201.

[0027] The connecting ring 1 also has several connecting parts 101 disposed on the inner wall of the connecting ring 1. The several connecting parts 101 are arranged in a central rotational symmetry structure around the center of the connecting ring 1. Each connecting part 101 is connected to a magnet section 201, which can realize the uniform distribution and precise positioning of the magnet section 201, ensure the symmetry of the magnetic field, improve the smoothness of motor operation, and optimize the assembly process to reduce manufacturing costs.

[0028] A locking block 102 is provided at the end of the connector 101. There are six locking blocks 102, which are arranged in a central rotational symmetric structure around the center of the connector 101. A circular connecting hole 204 is opened at the center of the magnet section 201. The locking block 102 is embedded into the connecting hole 204 through material deformation and engages with the magnet part 2. This can realize a quick and stable connection between the magnet section 201 and the connecting ring 1, while improving the seismic performance and fatigue resistance of the structure.

[0029] The edge of the connecting hole 204 facing the connector 101 has a rounded chamfer design. The opening size of the connecting hole 204 accounts for 10% of the side cross-section of the magnet joint 201. This can reduce the local impact of stress concentration on the magnet joint 201 and improve the mechanical strength of the magnet. In specific use, when the opening size of the connecting hole 204 is greater than 10% of the side cross-section of the magnet joint 201, magnetic force attenuation will occur. At the same time, it ensures that the connecting hole 204 does not affect the magnetic performance of the magnet joint 201, optimizes the lightweight design of the overall structure, and improves the heat dissipation effect of the magnet joint 201.

[0030] Working principle: First, align the connecting hole 204 of the magnet section 201 with the locking block 102 of the connecting ring 1. Rotate or press to insert the locking block 102 into the connecting hole 204, achieving mechanical locking. Then, each magnet section 201 engages with the adjacent magnet section 201 through the engagement teeth a202 and the engagement teeth b203, forming a complete annular magnet part 2. During assembly, epoxy resin is used to fill the contact surface between the magnet section 201 and the connecting ring 1, further solidifying the connection and enhancing structural stability. The connecting ring 1 is then fixed inside the motor stator or rotor using existing detachable fixing methods such as bolt connections or snap-fit ​​connections, ensuring it is installed concentrically with the motor housing. During motor operation, the magnetic field generated by the magnet section 201 is uniformly transmitted through the optimized engagement structure, reducing magnetic circuit losses. The high-temperature resistant nylon coating and rounded chamfer design effectively suppress stress concentration caused by high temperature and vibration, ensuring long-term reliable operation of the magnet under high-speed operation. The rotational symmetry design and lightweight structure of the connecting ring 1 not only ensures magnetic field symmetry but also reduces rotational inertia, ultimately improving motor efficiency and dynamic response performance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded neodymium iron boron magnets, characterized in that, include: A connecting ring (1) is installed inside the motor; The magnet part (2) is located inside the connecting ring (1). The magnet part (2) has a magnet joint (201) located on the inner wall of the connecting ring (1). The magnet joint (201) is connected to the connecting ring (1) through a connecting structure and fixed with epoxy resin. The magnet joint (201) has a certain curvature and fits the inner wall of the connecting ring (1). There are several magnet joints (201), and the several magnet joints (201) interlock with each other to form a ring.

2. The lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded NdFeB magnets according to claim 1, characterized in that: The magnet section (201) is integrally injection molded. The surface of the magnet section (201) is coated with high-temperature resistant nylon after being treated with heat-resistant plastic and additives.

3. The lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded NdFeB magnets according to claim 1, characterized in that: The magnet part (2) also has a meshing tooth a (202) provided on the side of the magnet joint (201), and a meshing tooth b (203) is provided at the end of the magnet joint (201) away from the meshing tooth a (202), and the meshing tooth a (202) and the meshing tooth b (203) mesh with each other.

4. The lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded NdFeB magnets according to claim 3, characterized in that: The edges of the occlusal teeth a (202) and b (203) are designed with rounded chamfers.

5. The lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded NdFeB magnets according to claim 1, characterized in that: The connecting ring (1) also has a number of connectors (101) disposed on the inner wall of the connecting ring (1). The connectors (101) are arranged in a central rotational symmetry structure around the center of the connecting ring (1). Each connector (101) is connected to a magnet (201).

6. The lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded NdFeB magnets according to claim 5, characterized in that: The connecting ring (1) also has a locking block (102) at the end of the connector (101). The locking block (102) has six blocks and is arranged in a central rotational symmetric structure around the center of the connector (101). A circular connecting hole (204) is opened at the center of the magnet section (201). The locking block (102) is embedded in the connecting hole (204) and engages with the magnet part (2).

7. The lightweight magnet structure for a two-wheeled vehicle drive motor based on bonded NdFeB magnets according to claim 6, characterized in that: The edge of the connecting hole (204) facing the connector (101) is designed with a rounded chamfer, and the opening size of the connecting hole (204) accounts for 10% of the side cross section of the magnet section (201).

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