A fixing device for magnetic steel of a brushless outer rotor motor

Abstract

A kind of fixing device of brushless outer rotor motor magnetic steel, including: potting layer, magnetic yoke, magnetic steel, sleeve.The utility model uses epoxy resin to pot together magnetic steel, carbon fiber sleeve and magnetic yoke, so that magnetic steel, magnetic yoke solidification is integrated, so as to ensure that the entire rotor is evenly stressed;Greatly reduce the risk of magnetic steel falling off.

Description

Technical Field

[0001] This utility model relates to the field of motor potting technology, specifically to a fixing device for the magnets of a brushless external rotor motor. Background Technology

[0002] Brushless motors are widely used in modern society. They are indispensable in various electrical appliances used in industry, manufacturing, service, and daily life. In some special environments, motors need to withstand high impact and vibration, such as in power tools, electric toys, automobiles, and robots. When applied to these environments that require resistance to high impact and vibration, it is necessary to ensure that the motor performance is not affected after being subjected to high impact and vibration.

[0003] Currently, most brushless external rotor motors use magnets that are simply glued to the inner wall of the yoke. This poses a significant risk of magnet detachment under high impact and vibration. Detached magnets can cause the motor to jam during operation, leading to burnout. While using glue to fix the magnets is simple and convenient in terms of manufacturing, it greatly reduces the motor's success rate. Utility Model Content

[0004] The purpose of this utility model is to provide a fixing device for the magnet of a brushless external rotor motor, including: a potting layer, a magnetic yoke, a magnet, and a sleeve.

[0005] The length of the magnet is less than the inner wall depth of the yoke, and the outer diameter of the magnet is equal to the inner wall diameter of the yoke.

[0006] The length of the sleeve is equal to the inner wall depth of the magnetic yoke, and the outer diameter of the sleeve is equal to the inner wall diameter of the magnet.

[0007] The magnet is attached to the inner wall of the yoke, and the magnet abuts against the bottom of the inner wall of the yoke.

[0008] The sleeve is fitted to the inner wall of the magnet, and the sleeve abuts against the bottom of the inner wall of the magnetic yoke.

[0009] The potting layer is assembled between the magnetic yoke and the sleeve, and the potting layer abuts against the magnet.

[0010] Furthermore, the potting layer is made of epoxy resin.

[0011] Furthermore, the sleeve is made of materials including carbon fiber.

[0012] The technical effect of this utility model is beyond doubt. This utility model uses epoxy resin to encapsulate the magnet, carbon fiber sleeve and magnetic yoke together, so that the magnet and magnetic yoke are solidified into one, thus ensuring that the entire rotor is subjected to uniform force and greatly reducing the risk of magnet detachment. Attached Figure Description

[0013] Figure 1 This is a sectional view of the right side of the fixing device;

[0014] Figure 2 This is a front view of the fixing device;

[0015] In the diagram: 1. Encapsulation layer; 2. Magnetic yoke; 3. Magnet; 4. Sleeve. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments, but it should not be construed as the scope of the present invention being limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and conventional methods in the art without departing from the above-described technical concept of the present invention should be included within the protection scope of the present invention.

[0017] Example 1:

[0018] See Figures 1 to 2 A fixing device for the magnet of a brushless external rotor motor includes: a potting layer 1, a magnetic yoke 2, a magnet 3, and a sleeve 4.

[0019] The length of the magnet 3 is less than the inner wall depth of the yoke 2, and the outer diameter of the magnet 3 is equal to the inner wall diameter of the yoke 2.

[0020] The length of the sleeve 4 is equal to the inner wall depth of the magnetic yoke 2, and the outer diameter of the sleeve 4 is equal to the inner wall diameter of the magnet 3.

[0021] The magnet 3 is attached to the inner wall of the yoke 2, and the magnet 3 abuts against the bottom of the inner wall of the yoke 2.

[0022] The sleeve 4 is attached to the inner wall of the magnet 3, and the sleeve 4 abuts against the bottom of the inner wall of the magnetic yoke 2.

[0023] The potting layer 1 is assembled between the magnetic yoke 2 and the sleeve 4, and the potting layer 1 abuts against the magnet 3.

[0024] Example 2:

[0025] A fixing device for the magnets of a brushless external rotor motor, the main technical contents of which are described in Embodiment 1, further wherein the potting layer 1 is made of epoxy resin.

[0026] Example 3:

[0027] A fixing device for the magnet of a brushless external rotor motor, the main technical contents of which are described in any one of Embodiments 1 to 2, and further, the sleeve 4 is made of carbon fiber.

[0028] Example 4:

[0029] See Figures 1 to 2A fixing device for the magnet of a brushless external rotor motor includes: a potting layer 1, a magnetic yoke 2, a magnet 3, and a sleeve 4.

[0030] The length of the magnet 3 is less than the inner wall depth of the yoke 2, and the outer diameter of the magnet 3 is equal to the inner wall diameter of the yoke 2.

[0031] The length of the sleeve 4 is equal to the inner wall depth of the magnetic yoke 2, and the outer diameter of the sleeve 4 is equal to the inner wall diameter of the magnet 3.

[0032] The magnet 3 is attached to the inner wall of the yoke 2, and the magnet 3 abuts against the bottom of the inner wall of the yoke 2.

[0033] The sleeve 4 is attached to the inner wall of the magnet 3, and the sleeve 4 abuts against the bottom of the inner wall of the magnetic yoke 2.

[0034] The potting layer 1 is assembled between the magnetic yoke 2 and the sleeve 4, and the potting layer 1 abuts against the magnet 3.

[0035] The entire assembly is encapsulated using potting layer 1 to ensure uniform stress distribution and prevent magnets from falling off due to high impact and vibration.

[0036] Example 5:

[0037] A fixing device for the magnets of a brushless external rotor motor, the main technical contents of which are described in Embodiment 4, further wherein the potting layer 1 is made of epoxy resin.

[0038] Example 6:

[0039] A fixing device for the magnet of a brushless external rotor motor, the main technical contents of which are described in any one of Embodiments 4 to 5, and further, the sleeve 4 is made of carbon fiber.

[0040] Example 7:

[0041] See Figures 1 to 2 A fixing device for the magnets of a brushless external rotor motor, the main technical contents of which include:

[0042] like Figures 1 to 2 As shown, the magnet is first attached to the magnetic yoke, then the carbon fiber sleeve is assembled into the attached magnet, and finally epoxy resin is used to pot it to complete the assembly, ensuring that the overall force is uniform and that the magnet will not fall off due to high impact and high vibration.

Claims

1. A fixing device for the magnets of a brushless external rotor motor, characterized in that, include: Encapsulation layer (1), magnetic yoke (2), magnet (3), sleeve (4); The length of the magnet (3) is less than the inner wall depth of the yoke (2), and the outer diameter of the magnet (3) is equal to the inner wall diameter of the yoke (2). The length of the sleeve (4) is equal to the inner wall depth of the magnetic yoke (2), and the outer diameter of the sleeve (4) is equal to the inner wall diameter of the magnet (3); The magnet (3) is attached to the inner wall of the yoke (2), and the magnet (3) abuts against the bottom of the inner wall of the yoke (2); The sleeve (4) is attached to the inner wall of the magnet (3), and the sleeve (4) abuts against the bottom of the inner wall of the magnetic yoke (2); The potting layer (1) is assembled between the magnetic yoke (2) and the sleeve (4), and the potting layer (1) abuts against the magnet (3).

2. The fixing device for the magnet of a brushless external rotor motor according to claim 1, characterized in that, The potting layer (1) is made of epoxy resin.

3. The fixing device for the magnet of a brushless external rotor motor according to claim 1, characterized in that, The sleeve (4) is made of carbon fiber.

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