Magnet fixing structure of brushless motor

Abstract

The utility model provides a magnet fixing structure of a brushless motor, which comprises a rotor, a bushing coaxially sleeved on the rotor, and a plurality of magnets arranged between the rotor and the bushing, the outer side wall of the rotor is provided with a plurality of mounting platforms arranged at intervals around the axial direction of the rotor, and a mounting space is formed between each mounting platform and the bushing. A magnet is arranged in each installation space, a first blocking part and a second blocking part are arranged at the two ends, in the axial direction of the rotor, of the lining respectively, and the first blocking part and the second blocking part are matched with each other to prevent the magnet from moving in the axial direction of the rotor. According to the magnet fixing mechanism of the brushless motor, the bushing is arranged on the outer side of the rotor, so that the magnet can be limited along the radial direction and the axial direction of the rotor, the magnet can be better fixed, mechanical damage of the magnet in the motor is avoided, and the fixing effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a magnet fixing structure of a brushless motor. Background Art

[0002] Brushless motors require magnets to generate a constant magnetic field that interacts with the alternating magnetic field generated by the motor windings to generate torque, thereby driving the motor rotor to rotate. In order to ensure the stability of the magnetic field during the operation of the motor, the magnets need to be fixed.

[0003] Most existing fixing methods use glue to directly bond the magnets to the rotor. During the rotation of the rotor, a certain amount of high temperature and vibration will be generated. When the motor runs at high speed for a long time, the magnets on the rotor are affected by the high temperature and vibration, causing the glue that bonds the magnets to fail, and eventually causing the magnets to fall off. The fallen magnets may cause mechanical damage inside the motor, such as scratching the rotor or stator, or even causing complete damage to the motor. The existing structure has poor magnet fixing effect and poses certain safety hazards. Utility Model Content

[0004] In view of this, the present invention aims to provide a magnet fixing structure for a brushless motor to solve the problem of poor magnet fixing effect.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A magnet fixing structure for a brushless motor comprises a rotor, a bushing coaxially sleeved on the rotor, and a plurality of magnets arranged between the rotor and the bushing; a plurality of mounting platforms arranged axially around the rotor are provided on the outer wall of the rotor, a mounting space is formed between each mounting platform and the bushing, and the magnets are respectively arranged in each mounting space; a first blocking portion and a second blocking portion are respectively provided at both ends of the bushing along the axial direction of the rotor, and the first blocking portion and the second blocking portion cooperate with each other to prevent the magnets from moving along the axial direction of the rotor.

[0007] Furthermore, the first blocking portion and the second blocking portion both extend radially inwardly of the rotor, and both are arranged in a circle around the axial direction of the rotor.

[0008] Furthermore, the installation space includes a sink or groove provided on the installation platform, and the magnet is provided in the groove.

[0009] Furthermore, the plurality of mounting platforms are evenly spaced around the axial direction of the rotor.

[0010] Furthermore, each of the mounting platforms is provided with a glue overflow groove arranged along the axial direction of the rotor.

[0011] Furthermore, the glue overflow groove penetrates the corresponding mounting platform along the axial direction of the rotor.

[0012] Furthermore, the side of the magnet facing the bushing has an abutment surface that follows the inner side of the bushing.

[0013] Furthermore, the first blocking portion and / or the second blocking portion are integrally formed on the bushing.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The magnet fixing structure of the brushless motor described in the present invention has multiple mounting platforms arranged on the outer side wall of the rotor to provide stable support for the magnet during the rotation of the brushless motor rotor, and the mounting space formed between the mounting platform and the bushing can better fix the magnet to prevent the magnet from loosening or falling off due to vibration during operation. The first blocking part and the second blocking part cooperate with each other to effectively prevent the magnet from axially deviating along the rotor to avoid mechanical damage to the magnet inside the motor, and the fixing effect is good.

[0016] Furthermore, the first blocking part and the second blocking part are arranged axially around the entire rotor, which can simultaneously limit multiple magnets, ensuring that all magnets are in a stable state, improving the overall fixing effect, and the first blocking part and the second blocking part can provide a consistent fixing effect, ensuring that each magnet is fixed to the same extent.

[0017] In addition, the magnet is located in a sink or groove, and the two side walls of the groove can provide additional support to prevent the magnet from shifting due to centrifugal force during high-speed rotation. Secondly, the design of the groove on the mounting platform can accurately position the installation of the magnet, thereby improving the installation accuracy of the magnet and simplifying the assembly process of the magnet.

[0018] In addition, the even distribution of multiple mounting platforms can ensure that the magnets are evenly distributed throughout the rotor, thereby optimizing the magnetic field distribution, improving the uniformity of the magnetic field, reducing vibrations caused by uneven distribution of magnets, improving the stability of motor operation, and ensuring uniform spacing between magnets, which helps air circulation and can evenly dissipate heat, improving overall heat dissipation performance.

[0019] Secondly, the glue overflow groove can accommodate excess glue, ensuring that the glue will not accumulate in the installation platform during the curing process, thereby ensuring uniform glue curing, ensuring good adhesion between the magnet and the installation platform, improving the reliability of magnet fixation, and also improving the installation flatness, avoiding center deviation, and reducing vibration during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic structural diagram of the magnet fixing structure of the brushless motor according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of the rotor according to an embodiment of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of the magnet according to an embodiment of the present utility model;

[0024] Figure 4 A half-section view of the bushing according to an embodiment of the present utility model;

[0025] Description of reference numerals:

[0026] 1. Rotor; 101. Mounting platform; 102. Glue overflow tank;

[0027] 2. Bushing; 201. First blocking portion; 202. Second blocking portion;

[0028] 3. Magnet; 301. Contact surface. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0030] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0031] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] Example 1

[0034] This embodiment relates to a magnet fixing structure of a brushless motor. The bushing 2 arranged on the outside of the rotor 1 can limit the magnet 3 along the radial and axial directions of the rotor 1, better fix the magnet, avoid mechanical damage caused by the magnet 3 falling off inside the motor, and have a good fixing effect.

[0035] In terms of overall structure, Figures 1 to 4 As shown, in this embodiment, it includes a rotor 1, a sleeve 2 coaxially sleeved on the rotor 1, and a plurality of magnets 3 arranged between the rotor 1 and the sleeve 2. The outer wall of the rotor 1 is provided with a plurality of mounting platforms 101 arranged axially around itself, and an mounting space is formed between each mounting platform 101 and the sleeve 2. A magnet 3 is provided in each mounting space. The sleeve 2 is provided with a first blocking portion 201 and a second blocking portion 202 at both ends along the axial direction of the rotor 1. The first blocking portion 201 and the second blocking portion 202 cooperate with each other to prevent the magnet 3 from moving along the axial direction of the rotor 1.

[0036] At this time, as set above, during the rotation of the brushless motor rotor 1, the multiple mounting platforms 101 arranged on the outer wall of the rotor 1 can provide stable support for the magnet 3, and the mounting space formed between the mounting platform 101 and the bushing 2 can better fix the magnet 3. The magnet 3 can be prevented from loosening or falling off due to vibration during operation by gluing, etc. The first blocking part 201 and the second blocking part 202 cooperate with each other to effectively prevent the magnet 3 from moving axially along the rotor 1 to avoid the magnet 3 from detaching from the mounting platform 101 and causing mechanical damage inside the motor, and the fixing effect is good.

[0037] Among them, in this embodiment, as a preferred implementation form, see Figure 4 As shown, both the first blocking portion 201 and the second blocking portion 202 extend radially inwardly of the rotor 1 and are arranged axially around the rotor 1. The first blocking portion 201 and the second blocking portion 202 are arranged axially around the entire rotor 1, and can simultaneously restrain multiple magnets 3, ensuring that all magnets 3 are in a stable state, thereby improving the overall fixing effect. Furthermore, the first blocking portion 201 and the second blocking portion 202 can provide a consistent fixing effect, ensuring that each magnet 3 is fixed to the same degree, reducing the risk of overall failure due to loose fixation of individual magnets 3.

[0038] In addition, in this embodiment, as a preferred implementation form, see Figure 2As shown, the installation space includes a recessed groove or groove provided on the installation platform 101, within which the magnet 3 is disposed. The two sidewalls of the recessed groove provide additional support for the magnet 3, preventing it from shifting due to centrifugal force during high-speed rotation. Furthermore, the recessed groove design on the installation platform 101 allows for precise positioning of the magnet 3, improving the installation accuracy of the magnet 3 while reducing subsequent calibration steps and simplifying the assembly process of the magnet 3.

[0039] And, in this embodiment, as a preferred implementation form, see Figure 2 As shown, multiple mounting platforms 101 are evenly spaced around the axial direction of the rotor 1. The evenly spaced mounting platforms 101 ensure that the magnets 3 are evenly distributed throughout the rotor 1, thereby optimizing the magnetic field distribution, improving the uniformity of the magnetic field, reducing vibration caused by uneven distribution of the magnets 3, and improving the stability of the motor operation. By ensuring that the spacing between the magnets 3 is uniform, air circulation is facilitated, heat can be evenly dissipated, and overall heat dissipation performance is improved.

[0040] Secondly, in this embodiment, as a preferred implementation form, see Figure 2 As shown, each mounting platform 101 is provided with a glue overflow groove 102 arranged along the axial direction of the rotor 1. The glue overflow groove 102 can accommodate excess glue, ensuring that the glue does not accumulate in the mounting platform 101 during the curing process, thereby ensuring uniform curing of the glue, ensuring good adhesion between the magnet 3 and the mounting platform 101, improving the reliability of the magnet 3 fixation, and also improving the flatness of the magnet installation, avoiding center deviation, and reducing vibration during operation.

[0041] Furthermore, in this embodiment, as a preferred implementation form, see Figure 2 As shown, the overflow glue groove 102 extends axially through the corresponding mounting platform 101 of the rotor 1. After the magnet 3 is installed, excess glue can flow out along the overflow glue groove 102, preventing it from accumulating around the magnet 3 or on the mounting platform 101, reducing the workload of subsequent manual cleaning of excess glue. No additional time and manpower are required to remove excess glue, thereby improving production efficiency. In addition, the excess glue flowing out through the overflow glue groove 102 can be collected and reused, reducing glue waste and saving raw materials.

[0042] It should be noted that, in this embodiment, as a preferred implementation form, see Figure 3As shown, the side of the magnet 3 facing the bushing 2 has an abutment profile 301 that follows the inner side of the bushing 2. The design of the abutment profile 301 can make the magnet 3 fit tightly with the bushing 2, improve the fixing effect of the magnet 3, and better prevent the magnet 3 from moving along the radial direction of the rotor 1, further improving the fixing effect of the magnet 3, and also reducing the displacement of the magnet 3 due to vibration or centrifugal force, thereby enhancing stability and reliability.

[0043] In this embodiment, as a preferred implementation form, the first blocking portion 201 and the second blocking portion 202 are integrally formed on the bushing 2, or the first blocking portion 201 is integrally formed on the bushing 2, and the second blocking portion 202 is provided on the bushing 2 by welding, riveting, etc., or the first blocking portion 201 is provided on the bushing 2 by welding, riveting, etc., and the second blocking portion 202 is integrally formed on the bushing 2. Similarly, the first blocking portion 201 and the second blocking portion 202 can cooperate to fix the magnet 3. The integrally formed design can enhance the bonding strength between the first blocking portion 201 and the second blocking portion 202 and the bushing 2, thereby improving the mechanical strength of the overall structure.

[0044] During the assembly process, glue is first applied to the installation space, where the glue can be epoxy resin, and then the magnets 3 are placed one by one in the corresponding installation space. At this time, the magnets 3 will be bonded to the corresponding installation space under the action of the glue, and the excess glue in the installation space will flow into the overflow glue groove 102 and flow out from both ends along the overflow glue groove 102.

[0045] At this time, the first end of the bushing 2 is provided with a first blocking portion 201, while the second end is not provided with a second blocking portion 202. After the bushing 2 is sleeved on the rotor 1 through its second end, the second end of the bushing 2 is processed by flanging or spinning, so that the second end of the bushing 2 is formed with a second blocking portion 202. The magnet is fixed in the axial direction of the rotor 1 through the first blocking portion 201 and the second blocking portion 202, further improving the fixing effect, preventing the magnet 3 from falling off in the installation space due to high temperature or vibration, causing damage to the inside of the motor, and having a good fixing effect.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnet fixing structure for a brushless motor, characterized in that: It comprises a rotor (1), a bushing (2) coaxially sleeved on the rotor (1), and a plurality of magnets (3) arranged between the rotor (1) and the bushing (2); The outer side wall of the rotor (1) is provided with a plurality of mounting platforms (101) arranged axially around the rotor (1) at intervals, a mounting space is formed between each mounting platform (101) and the bushing (2), and the magnet (3) is provided in each mounting space; A first blocking portion (201) and a second blocking portion (202) are respectively provided at both ends of the bushing (2) along the axial direction of the rotor (1); the first blocking portion (201) and the second blocking portion (202) cooperate with each other to prevent the magnet (3) from moving along the axial direction of the rotor (1).

2. The magnet fixing structure of the brushless motor according to claim 1, characterized in that: The first blocking portion (201) and the second blocking portion (202) both extend radially inwardly of the rotor (1), and both are arranged in a circle axially around the rotor (1).

3. The magnet fixing structure of the brushless motor according to claim 2, characterized in that: The installation space comprises a sink or groove provided on the installation platform (101), and the magnet (3) is provided in the groove.

4. The magnet fixing structure of the brushless motor according to claim 1, characterized in that: The plurality of mounting platforms (101) are evenly spaced around the axial direction of the rotor (1).

5. The magnet fixing structure of the brushless motor according to claim 4, characterized in that: Each of the mounting platforms (101) is provided with a glue overflow groove (102) arranged along the axial direction of the rotor (1).

6. The magnet fixing structure of the brushless motor according to claim 5, characterized in that: The glue overflow groove (102) penetrates the corresponding mounting platform (101) along the axial direction of the rotor (1).

7. The magnet fixing structure of the brushless motor according to claim 1, characterized in that: The side of the magnet (3) facing the bushing (2) has an abutment profile (301) that follows the inner side of the bushing (2).

8. The magnet fixing structure of the brushless motor according to claim 1, characterized in that: The first blocking portion (201) and / or the second blocking portion (202) are integrally formed on the bushing (2).

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