Mounting structure of outer rotor permanent magnet motor driver

Abstract

This application discloses an installation structure for an external rotor permanent magnet motor driver, aiming to solve the problem of poor driver reliability caused by fan vibration. The structure includes a driver body, a fan bracket, and a rubber soft claw and bolt assembly connecting the two. The rubber soft claw is a hollow cylindrical elastic element with an axially penetrating hollow hole, and its surface is covered with an oil-resistant insulating coating. During installation, the bolts pass sequentially through the mounting holes of the fan bracket, the rubber soft claw, and the driver body. Tightening the nuts causes the rubber soft claw to undergo 5%-15% axial pre-compression deformation, forming an elastic damping connection. The fan vibration energy is absorbed by the elastic deformation and damping characteristics of the compressed rubber soft claw. This structure optimizes damping efficiency through pre-compression, prevents aging with the insulating coating, and releases thermal stress through the waist-shaped hole design of the driver mounting plate. It has the advantages of simple assembly, low cost, and strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, specifically an installation structure for an external rotor permanent magnet motor driver. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) are synchronous motors that use permanent magnets to establish a magnetic field. They are characterized by their small size, high efficiency, and high power factor. Their rotors are made of permanent magnet materials, allowing them to operate without external excitation. Energy conversion is achieved through the synchronous interaction of the stator's rotating magnetic field and the rotor's magnetic field. Compared to traditional asynchronous motors, they offer significantly improved energy efficiency (by more than 10%) under light load conditions, and also boast higher power and torque densities.

[0003] External rotor permanent magnet motors generate strong vibrations during fan operation. Traditional drives are directly fixed to the motor or fan base via rigid brackets, causing vibration energy to be directly transferred to the drive. The internal electronic components are subjected to prolonged mechanical stress, which can easily lead to component loosening, solder joint cracking, and circuit board breakage, significantly reducing the drive's reliability and lifespan. Existing vibration damping solutions use ordinary rubber pads, but due to their lack of pre-compression design and simple structure, their damping performance is insufficient under high-frequency vibration environments, resulting in limited vibration reduction effects. Utility Model Content

[0004] This utility model addresses the problems existing in the prior art by providing an installation structure for an external rotor permanent magnet motor driver. The internal structure uses rubber soft claws to connect the driver to the fan motor bracket, effectively improving the actual shock absorption effect.

[0005] The fan includes a drive body and a fan bracket for fixing an external rotor permanent magnet motor, characterized in that it also includes rubber soft claws and bolt assemblies;

[0006] The rubber soft claw is a hollow cylindrical elastic component with an axially penetrating hollow hole;

[0007] The bolt assembly includes a bolt and a nut;

[0008] The rubber soft claw is disposed between the driver body and the fan bracket;

[0009] The bolts pass sequentially through the mounting holes of the fan bracket, the hollow holes of the rubber soft claws, and the mounting holes of the driver body, and are then tightened with nuts.

[0010] When the bolt assembly is tightened, the rubber soft claws are axially compressed and deformed, forming an elastic shock-absorbing connection.

[0011] Preferably, the outer diameter of the rubber soft claw is 20 mm, the diameter of the hollow hole is 7 mm, and the height is 10 mm.

[0012] Preferably, the rubber soft claw includes an elastic body and an insulating coating covering its outer surface, the insulating coating being made of oil-resistant rubber or silicone.

[0013] Preferably, the bottom of the driver body is provided with a mounting partition, and the mounting partition has a positioning hole coaxial with the hollow hole of the rubber soft claw.

[0014] Preferably, the number of rubber soft claws is 3-6, which are distributed in a circumferential array between the driver body and the fan bracket.

[0015] Preferably, the compression deformation of the rubber soft claw is 5%-15% of its initial height.

[0016] Preferably, the mounting holes of the fan bracket are fitted with metal bushings.

[0017] Preferably, the rubber soft claw is made of nitrile rubber, neoprene rubber, or silicone rubber.

[0018] Preferably, a flat washer is provided between the bolt head of the bolt assembly and the fan bracket.

[0019] Preferably, the mounting hole of the driver body is an oblong hole.

[0020] Compared with the prior art, this utility model provides an installation structure for an external rotor permanent magnet motor driver, which has the following advantages:

[0021] 1. This mounting structure is equipped with rubber soft claws to fix the driver and the fan motor bracket. It adopts a pre-compression design, which can significantly improve damping performance and effectively reduce vibration transmission rate.

[0022] 2. An isolation coating is provided on the outer wall of the rubber soft claw, which can effectively prevent oil stains from corroding and extend the service life of the rubber soft claw;

[0023] 3. The mounting holes of the driver body are designed as oblong mounting holes to allow for thermal expansion and contraction displacement during installation and avoid stress concentration. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0026] Figure 2 This is a specific embodiment of the present utility model. Figure 1 A magnified view of a section at point A;

[0027] Figure 3 This is a schematic diagram of the rubber soft claw component in a specific embodiment of the present invention;

[0028] Figure 4 This is a cross-sectional view of the rubber soft claw in a specific embodiment of this utility model.

[0029] In the diagram: 1. Driver body; 2. Fan bracket; 3. Bolt assembly; 4. Rubber soft claw; 101. Mounting partition; 102. Positioning hole; 201. Isolation coating; 202. Elastic body. Detailed Implementation

[0030] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0032] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0035] Example 1:

[0036] like Figure 1-4 As shown, this mounting structure includes a drive body 1, a fan bracket 2, a bolt assembly 3, and a rubber soft claw 4; the assembly process of the rubber soft claw 4 is as follows:

[0037] 1. Pre-treatment: Press a metal bushing into the mounting hole of the fan bracket 2, and machine an oblong hole in the mounting partition 101 at the bottom of the driver body 1;

[0038] 2. Positioning rubber soft claws: Place three rubber soft claws 4 on the mounting holes of the fan bracket 2, with their insulating coating 201 facing the driver side;

[0039] 3. Centering connection: The mounting plate 101 of the driver body 1 is pressed down to make the positioning hole 102 coaxial with the hollow hole of the rubber soft claw 4;

[0040] 4. Pre-compression fixing: Take the M6 ​​bolts and pass them through the waist-shaped holes of the fan bracket 2-rubber soft claw 4-installation partition 101 in sequence. After adding the flat washer, tighten the nut. Control the torque wrench to 15 N·m. The rubber soft claw 4 is compressed to a height of 9 mm.

[0041] 5. Uniform reinforcement: Repeat steps 2-4 to complete the installation of the remaining two rubber soft claws by evenly distributing points around the 120° circumference.

[0042] Furthermore, the vibration damping mechanism of the mounting structure of the external rotor permanent magnet motor driver was verified:

[0043] When the fan is running at 2000 rpm, the vibration energy is transmitted to the bolt assembly 3 through the fan support 2;

[0044] The pre-compressed rubber soft claw 4 elastic body 202 undergoes radial / axial deformation, and the isolation coating 201 prevents oil stains from penetrating;

[0045] The accelerometer of the actuator body 1 showed that the vibration amplitude dropped from 12g to 5g in the rigid connection.

[0046] Example 2:

[0047] For certain high-temperature applications, a high-temperature resistant variant design for this mounting structure is required to adapt to different operational needs. Specific replacement options for this mounting structure are as follows:

[0048] The material of the rubber soft claw 4 is replaced with silicone rubber, which effectively improves its Shore hardness; the isolation coating 201 is thickened to 0.5mm, and the temperature resistance is improved to 150℃; the waist-shaped hole is arranged along the thermal expansion axis in the length direction, allowing ±0.8mm thermal displacement.

[0049] In actual use, this replacement part can maintain a stable working state for a long time, while the internal rubber soft claw 4 can ensure a stable compression rebound rate without cracking.

[0050] Example 3:

[0051] For applications requiring high-power motors for power supply, necessitating the use of high-power fans, the specific replacement solution for this installation structure is as follows:

[0052] The number of rubber soft claws has increased to 6, evenly distributed in a 60° circle;

[0053] The elastic body 202 is made of neoprene rubber and filled with carbon black to enhance damping.

[0054] The compression deformation increased to 12%, and the preload torque was increased to 20 N·m;

[0055] Results: At 2500rpm, the stress on the driver PCB board decreased from 180MPa to 75MPa, and there were zero failures at the chip solder joints.

[0056] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0057] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0058] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A mounting structure for an external rotor permanent magnet motor driver, comprising a driver body and a fan bracket for fixing the external rotor permanent magnet motor, characterized in that: It also includes rubber soft claws and bolt assemblies; The rubber soft claw is a hollow cylindrical elastic component with an axially penetrating hollow hole; The bolt assembly includes a bolt and a nut; The rubber soft claw is disposed between the driver body and the fan bracket; The bolts pass sequentially through the mounting holes of the fan bracket, the hollow holes of the rubber soft claws, and the mounting holes of the driver body, and are then tightened with nuts. When the bolt assembly is tightened, the rubber soft claws are axially compressed and deformed, forming an elastic shock-absorbing connection.

2. The installation structure according to claim 1, characterized in that: The outer diameter of the rubber soft claw is 20 mm, the diameter of the hollow hole is 7 mm, and the height is 10 mm.

3. The installation structure according to claim 1, characterized in that: The rubber soft claw includes an elastic body and an insulating coating covering its outer surface, the insulating coating being made of oil-resistant rubber or silicone.

4. The installation structure according to claim 1, characterized in that: The bottom of the driver body is provided with a mounting partition, and the mounting partition has a positioning hole coaxial with the hollow hole of the rubber soft claw.

5. The installation structure according to claim 1, characterized in that: The number of rubber soft claws is 3-6, and they are arranged in a circular array between the driver body and the fan bracket.

6. The installation structure according to claim 1, characterized in that: The compression deformation of the rubber soft claw is 5%-15% of its initial height.

7. The installation structure according to claim 1, characterized in that: The mounting holes of the wind turbine bracket are fitted with metal bushings.

8. The installation structure according to claim 1, characterized in that: The rubber soft claw is made of nitrile rubber, neoprene rubber, or silicone rubber.

9. The installation structure according to claim 1, characterized in that: A flat washer is provided between the bolt head of the bolt assembly and the fan bracket.

10. The mounting structure according to claim 1, characterized in that: The mounting hole of the driver body is an oblong hole.

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