Brushless motor

Abstract

A brushless motor comprises a stator fixing support of an iron tubular structure, the inner wall of a tubular cavity of the stator fixing support is provided with at least two square convex hulls which are evenly arranged in the circumferential direction, the square convex hulls form two shelving platforms perpendicular to the axial direction of the stator fixing support, and each shelving platform is provided with a bearing gasket. The bearing gaskets and the pipe cavities of the stator fixing supports on the corresponding sides form bearing chambers, and bearings are installed in the bearing chambers. According to the stator fixing support, the square convex hull is arranged and is matched with the bearing gasket to form the bearing chamber, so that the concentricity of a mounted bearing is high, the concentricity can be within 0.02 mm, and the mounting precision is high; the stator fixing support is inserted into the circuit mainboard and is in positioning connection with the circuit mainboard through the positioning columns, so that the perpendicularity of the stator fixing support and the circuit mainboard is within 0.02 mm, and the installation precision is high; in addition, the stator fixing support can be formed by stretching an iron material, 25 finished products can be produced in one minute through continuous stretching, the production efficiency is improved, and the cost is reduced.

Description

Technical Field

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

[0002] The primary function of a brushless motor is to generate driving torque, serving as a power source for electrical appliances and various machinery. The stator bracket, the primary support component of a brushless motor, secures the printed circuit board (PCB) and stator. Existing stator brackets feature an annular protrusion within their inner cavity, forming a step with bearing chambers on either side. Stator brackets employing this structure are typically made of aluminum alloy and die-cast. This results in poor concentricity after bearing installation, impacting motor quality. Furthermore, die-casting production is inefficient, typically producing only four semi-finished products per minute. Utility Model Content

[0003] Based on this, the utility model provides a brushless motor to solve the problem that the stator fixing bracket of the existing brushless motor can only be formed by die casting due to its structural characteristics, resulting in poor concentricity.

[0004] To achieve the above-mentioned objectives, the present utility model provides a brushless motor, which includes a stator fixing bracket with an iron tubular structure, the inner wall of the tube cavity of the stator fixing bracket having at least two square convex hulls evenly arranged in the circumferential direction, all of the square convex hulls forming two supporting platforms perpendicular to the axial direction of the stator fixing bracket, each of the supporting platforms being placed with a bearing gasket, the bearing gasket and the tube cavity of the stator fixing bracket on the corresponding side forming a bearing chamber, and a bearing being installed in the bearing chamber.

[0005] As a further preferred technical solution of the present invention, a recess is provided on the outer wall of the lumen of the stator fixing bracket at a position corresponding to the square convex bulge.

[0006] As a further preferred technical solution of the present invention, the number of the square convex hulls is four.

[0007] As a further preferred technical solution of the present invention, the square convex bump and the stator fixing bracket are integrally formed.

[0008] As a further preferred technical solution of the present invention, it also includes a circuit main board, the circuit main board is provided with a mounting hole for the stator fixing bracket to pass through, a positioning hole is provided on the side of the mounting hole, the outer edge of one end of the stator fixing bracket is connected to at least two positioning posts, the front end of the positioning post is bent once and then arranged on the side of the stator fixing bracket, the stator fixing bracket is inserted into the mounting hole and is positioned by plugging the positioning post into the positioning hole.

[0009] As a further preferred technical solution of the present invention, there are three positioning posts, and the three positioning posts are arranged at intervals.

[0010] As a further preferred technical solution of the present invention, the stator fixing bracket is used to set the positioning column and is further provided with a lug on the outer edge, and a screw hole is provided on the lug, and the screw hole is used to be equipped with a screw that is screwed to the circuit main board.

[0011] The brushless motor of the present invention adopts the above technical solution to achieve the following beneficial effects:

[0012] 1) The stator fixing bracket of the utility model forms a bearing chamber by providing a square convex bulge and cooperating with a bearing gasket, so that the concentricity of the installed bearing is high, and the concentricity can be within 0.02mm, with high installation accuracy;

[0013] 2) The stator fixing bracket of the utility model is plugged into the circuit main board and is positioned and connected to the circuit main board by setting a positioning column, so that the verticality of the two is within 0.02mm, and the installation accuracy is high;

[0014] 3) The stator fixing bracket of the utility model can be formed by stretching iron material, and the continuous stretching die can produce 25 finished products in one minute, which not only improves production efficiency but also reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0016] Figure 1 This is an exploded diagram of the assembly of the stator fixing bracket and the circuit main board.

[0017] Figure 2 This is a one-view structural diagram of the stator fixing bracket and the circuit main board when assembled.

[0018] Figure 3 This is a structural schematic diagram from another perspective when the stator fixing bracket and the circuit main board are assembled.

[0019] Figure 4 Schematic diagram of the structure of the stator fixing bracket, a is the upward viewing angle, and b is the front viewing angle.

[0020] In the figure: 1. stator fixing bracket, 11. square convex bump, 12. bearing chamber, 13. positioning column, 14. lug, 2. circuit board, 3. bearing gasket, 4. bearing.

[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Terms such as "upper," "lower," "left," "right," "center," and "one" used in the preferred embodiments are for ease of description and are not intended to limit the scope of the present invention. Changes or adjustments to these relative terms, without substantially altering the technical content, are also considered within the scope of the present invention.

[0023] like Figure 1-4 As shown, the utility model provides a brushless motor, comprising a stator fixing bracket 1 of an iron tubular structure, and a circuit mainboard 2 fixedly connected to the stator fixing bracket 1 .

[0024] The inner wall of the stator fixture 1 has four square protrusions 11 evenly spaced around the circumference. The outer wall of the stator fixture 1 has recesses corresponding to these protrusions 11. These protrusions 11 are integrally formed with the stator fixture 1. These protrusions 11 form two support platforms perpendicular to the axial direction of the stator fixture 1. Each support platform houses a bearing washer 3. The bearing washer 3 and the corresponding lumen of the stator fixture 1 form a bearing chamber 12. Within this bearing chamber 12 is a bearing 4 supported by the bearing washer 3.

[0025] The circuit main board 2 is provided with a mounting hole for the stator fixing bracket 1 to pass through. The outer edge of one end of the stator fixing bracket 1 is connected to three spaced positioning posts 13. The front end of the positioning post 13 is bent once into a "7"-shaped structure and is arranged on the side of the stator fixing bracket 1. A positioning hole is provided on the side of the mounting hole. The stator fixing bracket 1 is inserted into the mounting hole and is positioned by inserting the positioning post 13 into the positioning hole.

[0026] The stator fixing bracket 1 is used to set the positioning column 13. The outer edge of the stator fixing bracket 1 is also provided with a lug 14. The lug 14 is provided with a screw hole. The screw hole is used to be equipped with a screw that is screwed to the circuit main board 2 to fix the stator fixing bracket 1 to the circuit main board 2.

[0027] When assembling the brushless motor, the outer shape of the stator fixing bracket 1 is tightly fitted with the inner hole of the stator iron core, and the rotor is inserted into the stator fixing bracket 1 and supported and connected by two bearings 4. The installation of the stator, rotor and stator fixing bracket 1 are all conventional structures and will not be described in detail here.

[0028] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A brushless motor, characterized in that: A stator fixing bracket includes an iron tubular structure, wherein the inner wall of the tube cavity of the stator fixing bracket has at least two square convex hulls evenly arranged in the circumferential direction, and all the square convex hulls constitute two shelf platforms perpendicular to the axial direction of the stator fixing bracket, and each shelf platform is placed with a bearing gasket, and the bearing gasket and the tube cavity of the stator fixing bracket on the corresponding side constitute a bearing chamber, and a bearing is installed in the bearing chamber.

2. The brushless motor according to claim 1, wherein: The outer wall of the tube cavity of the stator fixing bracket is recessed at a position corresponding to the square convex bulge.

3. The brushless motor according to claim 1, wherein: The number of the square convex hulls is four.

4. The brushless motor according to claim 1, wherein: The square convex bump and the stator fixing bracket are integrally formed.

5. The brushless motor according to any one of claims 1 to 4, characterized in that: The stator fixing bracket further comprises a circuit main board, wherein the circuit main board is provided with a mounting hole for the stator fixing bracket to pass through, a positioning hole is provided on the side of the mounting hole, and at least two positioning posts are connected to the outer edge of one end of the stator fixing bracket, and the front end of the positioning post is bent once and arranged on the side of the stator fixing bracket, and the stator fixing bracket is inserted into the mounting hole and positioned by plugging the positioning post into the positioning hole.

6. The brushless motor according to claim 5, characterized in that There are three positioning posts, and the three positioning posts are arranged at intervals.

7. The brushless motor according to claim 5, characterized in that The stator fixing bracket is used to set the positioning column. The outer edge of the stator fixing bracket is also provided with a lug. The lug is provided with a screw hole. The screw hole is used to be equipped with a screw that is screwed to the circuit main board.

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