A brushless DC motor

Abstract

This utility model provides a brushless DC motor, belonging to the field of motor technology. It includes a stator core and a shaft, with a first bearing and a second bearing mounted on the shaft. Several axial ribs are fixedly arranged inside the stator core, distributed in a circumferential array along the central axis of the stator core, forming bearing channels between them. The first and second bearings are located within the bearing channels and are connected by an interference fit. A magnet and an elastic component are mounted on the outer surface of the shaft, with the magnet located between the first and second bearings, and the elastic component positioned between the second bearing and the magnet. This design eliminates the need for bearing mounting fasteners through the interference fit between the bearings and the bearing channels, significantly reducing the motor size, facilitating motor miniaturization, saving space, and providing better practical performance.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a brushless DC motor. Background Technology

[0002] Brushless DC motors (BLDC) are motors that use electronic commutation instead of mechanical brushes and commutators. They have advantages such as high efficiency, long lifespan, and low noise, and are widely used in drones, electric vehicles, industrial automation, home appliances and other fields.

[0003] However, in most existing high-speed brushless DC motors, the two bearings are fixed to the housing, with the bearing outer ring bonded to the housing via adhesive. This design, facilitating disassembly and assembly, results in a housing that is often divided into two parts, which are then assembled together. This makes the motor longer, hindering the trend towards motor miniaturization and increasing production costs. Furthermore, when motors with larger axial dimensions are used in food processors such as blenders, the higher center of gravity leads to excessive vibration and noise, significantly reducing the user experience. Summary of the Invention

[0004] To address the problems existing in the background technology, this utility model provides a brushless DC motor.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A brushless DC motor includes a stator core and a shaft. A first bearing and a second bearing are sleeved on the shaft. A plurality of axial ribs are fixedly arranged inside the stator core, and the plurality of axial ribs are arranged in a circumferential array along the central axis of the stator core, forming a bearing channel between the plurality of axial ribs. The first bearing and the second bearing are located in the bearing channel and are connected by an interference fit. A magnet and an elastic component are sleeved on the outer surface of the shaft. The magnet is located between the first bearing and the second bearing, and the elastic component is disposed between the second bearing and the magnet.

[0007] Furthermore, a housing is fixedly mounted on the outer surface of the stator core, and a terminal block and a printed circuit board are fixedly mounted on one end of the stator core.

[0008] Furthermore, the length T1 of the motor stator core is greater than or equal to the length T2+6 of the magnet.

[0009] Furthermore, one end of the elastic member abuts against the magnet, and the other end abuts against the inner ring of the second bearing.

[0010] Furthermore, the motor stator core is formed by die casting using a mold to accommodate bearing channels.

[0011] This application has the following beneficial effects:

[0012] This solution eliminates the need for bearing mounting fasteners by using an interference fit between the bearing and the bearing channel, resulting in a significant reduction in motor size. This facilitates the trend towards motor miniaturization, saves more space, and provides better practical performance. Attached Figure Description

[0013] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0014] Figure 1 This is a diagram of the rotor assembly of this utility model;

[0015] Figure 2 This is an exploded view of the entire utility model;

[0016] Figure 3 This is a schematic diagram of the stator core structure of this utility model;

[0017] Figure 4 This is a sectional view of the bearing installation of this utility model;

[0018] Figure 5 This is a dimensional drawing of the stator core and magnet of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Terminal block; 2. Printed circuit board; 3. Stator core; 4. Housing; 5. First bearing; 6. Magnet; 7. Shaft; 8. Elastic component; 9. Second bearing; 10. Fan blade; 3-1. Axial rib; 3-2. Bearing channel. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] like Figures 1-5 As shown, the technical solution adopted by this utility model is as follows: A brushless DC motor includes a stator core 3 and a rotating shaft 7. A housing 4 is fixedly sleeved on the outer surface of the stator core 3, and a printed circuit board 2 and a terminal block 1 are fixedly disposed at one end of the stator core 3.

[0023] Axial ribs 3-1 are fixedly provided inside the stator core 3. There are multiple axial ribs 3-1, which are arranged in a circular array along the central axis of the stator core 3. The axial ribs 3-1 are formed by die casting through a mold, and a bearing channel 3-2 is formed between several axial ribs 3-1.

[0024] The outer surface of the rotating shaft 7 is fitted with a first bearing 5, a second bearing 9, a fan blade 10, and a magnet 6. The magnet 6 is positioned between the first bearing 5 and the second bearing 9. The magnet 6 can be bonded or directly fixed. The length T1 of the motor stator core 3 is greater than or equal to the length T2 + 6 of the magnet. An elastic member 8 is provided between the magnet 6 and the second bearing 9. The elastic member 8 is fitted on the outer surface of the rotating shaft 7, with one end abutting against the magnet 6 and the other end abutting against the second bearing 9.

[0025] Both the first bearing 5 and the second bearing 9 are interference-fitted with the bearing channel 3-2, eliminating the need for mounting fasteners. This significantly reduces the size of the motor, facilitating the trend towards motor miniaturization, saving more space, and resulting in better practicality.

[0026] In addition, several evenly distributed axial concave and convex rib grooves with a width of 1-2mm are designed on the stator core 3, which helps to reduce the squeezing force with the first bearing 5 and the second bearing 9, thereby protecting the first bearing 5 and the second bearing 9 from damage and deformation when they are installed.

[0027] Working principle: First, the first bearing 5 is pressed into the stator core 3 using a specific tooling. After the magnet 6 is assembled on the rotating shaft 7, it is inserted into the bearing channel 3-2 of the stator core 3. Then, the elastic component 8 is placed in, and the second bearing 9 is pressed in. The connection is completed through the interference fit between the first bearing 5, the second bearing 9 and the bearing channel 3-2.

[0028] After the second bearing 9 is installed, the fan blade 10 is assembled, and finally it is assembled with the housing 4.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A brushless DC motor, characterized in that, The device includes a stator core (3) and a rotating shaft (7). A first bearing (5) and a second bearing (9) are fitted on the rotating shaft (7). Several axial ribs (3-1) are fixedly arranged inside the stator core (3). The several axial ribs (3-1) are arranged in a circular array along the central axis of the stator core (3). A bearing channel (3-2) is formed between the several axial ribs (3-1). The first bearing (5) and the second bearing (9) are located in the bearing channel (3-2) and are connected by an interference fit. A magnet (6) and an elastic component (8) are fitted on the outer surface of the rotating shaft (7). The magnet (6) is located between the first bearing (5) and the second bearing (9). The elastic component (8) is arranged between the second bearing (9) and the magnet (6).

2. The brushless DC motor according to claim 1, characterized in that, The outer surface of the stator core (3) is fixedly provided with a housing (4), and a terminal block (1) and a printed circuit board (2) are fixedly provided at one end of the stator core (3).

3. A brushless DC motor according to claim 2, characterized in that, The length T1 of the stator core (3) is greater than or equal to the length T2+6 of the magnet (6).

4. A brushless DC motor according to claim 1, characterized in that, One end of the elastic member (8) abuts against the magnet (6), and the other end abuts against the inner ring of the second bearing (9).

5. A brushless DC motor according to claim 1, characterized in that, The stator core (3) is formed by die casting through a mold and is equipped with a bearing channel (3-2).

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