Stator assembly of brushless external rotor motor with compact structure

Abstract

The utility model relates to the technical field of brushless motor design, in particular to a stator assembly of a brushless external rotor motor with a compact structure, which is technically characterized by comprising a stator chip assembly and a bearing seat, the bearing seat is inserted in the stator chip assembly and comprises a fixed disc, and the fixed disc is fixedly connected with the stator chip assembly. A circular caulking groove is formed in the fixed disc, a PCB is embedded in the caulking groove, and the PCB is fixed in the caulking groove of the fixed disc. The PCBA is placed in the bearing seat, so that the height of the stator assembly and the space of the outer diameter are effectively reduced, and the size of the stator assembly is greatly compressed. Therefore, by effectively compressing the volume, the application field of the brushless outer rotor motor, such as sports equipment, is further enlarged, and the market share is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the brushless motor design technical field, concretely relates to a compact structure's brushless outer rotor motor's stator subassembly. BACKGROUND

[0002] With the continuous leap of motor manufacturing technology and the development of modern industry and daily life, the requirements of motor performance are constantly moving towards a new height. These requirements are not only limited to the traditional sense of small size, light weight, to adapt to the increasingly compact equipment space and light weight trend, but also to the core performance indicators such as motor operating efficiency, high-speed constant power output and wide speed regulation range. Especially in the pursuit of high efficiency and green energy saving, the efficient operation of the motor has become an important measure of its technical level. Permanent magnet DC brushless motor, as the best in the innovation of motor technology, with its unique permanent magnet design, brushless commutation system and advanced control strategy, has shown incomparable performance advantages. They not only have much higher energy efficiency than traditional motors, can realize lower energy consumption and higher efficiency under the same power, also have excellent running stability, low noise and high reliability, these characteristics make permanent magnet DC brushless motor widely recognized and applied in many fields such as high-grade household appliances, electric vehicles and industrial automation.

[0003] Especially in the field of high-grade household appliances, with the continuous improvement of consumers' requirements for product quality and life quality, permanent magnet DC brushless motor with its excellent speed regulation performance, precise temperature control ability and long service life, has become the key factor to improve the overall performance of household appliances and user experience. However, in the face of the growing demand for individualization and customization in the market, the brushless outer rotor motor on the market is locked on the outer diameter of the bearing seat, and a certain electrical distance is required between the stator chip assembly, so how to further compress the volume of the motor and realize more compact and efficient design has become an important issue to be solved in the development of brushless motor technology. UTILITY MODEL CONTENTS

[0004] Therefore, the purpose of the utility model is to further compress the volume of the motor and realize more compact and efficient design of the motor design.

[0005] The above technical purpose of the utility model is realized by the following technical scheme:

[0006] A compact structure's brushless outer rotor motor's stator subassembly, including stator chip assembly and bearing seat, the bearing seat is inserted in the stator chip assembly, the bearing seat includes a fixed disc, the fixed disc is provided with a circular embedding groove, a PCB board is embedded in the embedding groove, and the PCB board is fixed in the embedding groove of the fixed disc.

[0007] Preferably, the bearing seat comprises a base and an insertion end, the insertion end is embedded in the stator core assembly, the base is located at one end of the insertion end in the length direction, and the fixing disc is located on the side of the base away from the insertion end.

[0008] Preferably, the length of the insertion end is less than the thickness of the stator core assembly, and the base is integrally formed with the insertion end.

[0009] Preferably, the insertion end is in the form of a hollow cylinder, a bearing is embedded in the insertion end, the bearing is arranged in an array along the length direction of the insertion end, and the bearing is arranged in abutment with the inner wall of the insertion end.

[0010] Preferably, the base is connected with the insertion end, the diameter of the outer wall of the base is greater than the diameter of the outer wall of the insertion end, and a step formed between the outer wall of the base and the outer wall of the insertion end abuts against the end face of the stator core assembly.

[0011] Preferably, a clearance portion is arranged on the outer periphery of the PCB, and the clearance portion is arranged between the embedding groove and the PCB.

[0012] Preferably, a plurality of fixing bolts are arranged on the PCB, the fixing bolts pass through the PCB and are threadedly fixed on the fixing disc.

[0013] Preferably, a recess is formed in the fixing disc at one end of the length direction of the fixing disc, and an arc-shaped protruding portion is arranged at the other end of the length direction of the fixing disc.

[0014] Preferably, the inside of the base is in communication with the hollow portion of the insertion end, and the embedding groove is in communication with the hollow portion of the insertion end.

[0015] The stator assembly of the compact structure brushless outer rotor motor provided in the application effectively reduces the height and outer diameter of the stator assembly by placing the PCBA in the bearing seat, greatly compresses the volume of the stator assembly, and further increases the use field of the brushless outer rotor motor, such as sports equipment, and greatly improves the market share. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an overall structure schematic view of the stator assembly of the compact structure brushless outer rotor motor in one embodiment of the application.

[0017] Figure 2 It is an overall structure schematic view of the stator assembly of the compact structure brushless outer rotor motor in one embodiment of the application.

[0018] Figure 3 Figure is a cross-sectional view of a stator assembly of a compact structure brushless outer rotor motor according to an embodiment of the present application;

[0019] In the figure, 1, stator core assembly; 2, bearing seat; 21, insertion end; 211, bearing; 212, shaft core seat; 22, base; 221, fixed disc; 2211, groove; 2212, protruding part; 222, embedding groove; 223, PCB board; 2231, accommodation part; 2232, fixed bolt. DETAILED DESCRIPTION

[0020] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Please refer to Figure 1 and Figure 2 A stator assembly of a compact structure brushless outer rotor motor, comprising a stator core assembly 1 and a bearing 211 seat 2, the bearing 211 seat 2 is inserted in the stator core assembly 1.

[0022] Please refer to Figure 2 and Figure 3 The bearing 211 seat 2 comprises a base 22 and an insertion end 21, the insertion end 21 is embedded in the stator core assembly 1, the base 22 is located at one end of the length direction of the insertion end 21, in an embodiment, the length of the insertion end 21 is less than the thickness of the stator core assembly 1, and the base 22 and the insertion end 21 are integrally formed.

[0023] In an embodiment, the insertion end 21 is provided in a hollow cylindrical shape, the insertion end 21 is embedded with bearings 211, the bearings 211 are arranged in the length direction of the insertion end 21, and the bearings 211 and the inner wall of the insertion end 21 are arranged in mutual abutment. The bearings 211 are used for the shaft core (not shown in the figure) to pass through, in an embodiment, the insertion end 21 is further provided with a shaft core seat 212, and the shaft core seat 212 is used for abutting the end of the shaft core.

[0024] Please refer to Figure 1 and Figure 2 The base 22 is connected with the insertion end 21, the inside of the base 22 is in communication with the hollow part of the insertion end 21, the diameter of the outer wall of the base 22 is greater than the diameter of the outer wall of the insertion end 21, and the step formed between the outer wall of the base 22 and the outer wall of the insertion end 21 abuts on the end face of the stator core assembly 1.

[0025] The base 22 is provided with a fixing disc 221 at one end away from the insertion end 21, which is used to cooperate with the motor housing to be fixed on the motor housing. The fixing disc 221 is provided in a substantially rectangular plate, and a circular embedding groove 222 is arranged in the middle of the length direction of the fixing disc 221, which is in communication with the hollow part of the insertion end 21. A PCB board 223 is embedded in the circular embedding groove 222, and the PCB board 223 is fixed in the embedding groove 222 of the fixing disc 221. By embedding the PCB board 223 in the fixing disc 221, the volume of the PCB board 223 is reduced compared with the motor structure in the prior art, and the entire motor structure (width and height) becomes more compact. The PCB board 223 is provided with a control module and a driving module. In an embodiment, the PCB board 223 is provided with a displacement part 2231 around the periphery, which is between the embedding groove 222 and the PCB board 223, for facilitating the installation and disassembly of the PCB board 223.

[0026] In order to realize the fixation of the PCB board 223, in an embodiment, a plurality of fixing bolts 2232 are arranged on the PCB board 223, which pass through the PCB board 223 and are threadedly fixed on the fixing disc 221.

[0027] In an embodiment, the fixing disc 221 is provided with a recessed groove 2211 at one end in the length direction, and is provided with an arc-shaped protruding part 2212 at the other end in the length direction.

[0028] The stator assembly of the compact brushless outer rotor motor provided in the application effectively reduces the height and outer diameter of the stator assembly by placing the PCBA inside the bearing 211 seat 2, greatly compressing the volume of the stator assembly. Thus, by effectively compressing the volume, the use field of the brushless outer rotor motor is further increased, such as sports equipment, etc., greatly improving the market share.

Claims

1. A compact stator assembly for a brushless outer rotor motor, comprising a stator core assembly and a bearing seat, wherein the bearing seat is inserted into the stator core assembly, and characterized in that: The bearing seat includes a fixed plate, a circular embedding groove is provided on the fixed plate, a PCB board is embedded in the embedding groove, and the PCB board is fixed in the embedding groove of the fixed plate.

2. The stator assembly of a compact brushless outer rotor motor according to claim 1, characterized in that: The bearing seat includes a base and an insertion end, the insertion end is embedded in the stator chip assembly, the base is located at one end of the insertion end in the length direction, and the fixing plate is located on the side of the base away from the insertion end.

3. The stator assembly of a compact brushless outer rotor motor according to claim 2, characterized in that: The length of the insertion end is smaller than the thickness of the stator chip assembly, and the base and the insertion end are integrally formed.

4. The stator assembly of a compact brushless outer rotor motor according to claim 3, characterized in that: The insertion end is in a hollow cylindrical shape, and a bearing is embedded in the insertion end. The bearings are arranged in an array along the length direction of the insertion end, and the bearings and the inner wall of the insertion end are arranged to abut against each other.

5. The stator assembly of a compact brushless outer rotor motor according to claim 4, characterized in that: The base is connected to the insertion end, the diameter of the outer wall of the base is larger than the diameter of the outer wall of the insertion end, and the step formed between the outer wall of the base and the outer wall of the insertion end abuts against the end surface of the stator chip assembly.

6. The stator assembly of a compact brushless outer rotor motor according to claim 5, characterized in that: A clearance portion is provided on the outer periphery of the PCB board, and the clearance portion is located between the embedding groove and the PCB board.

7. The stator assembly of a compact brushless outer rotor motor according to claim 6, characterized in that: A plurality of fixing bolts are provided on the PCB board. The fixing bolts pass through the PCB board and are threadedly fixed on the fixing plate.

8. The stator assembly of a compact brushless outer rotor motor according to claim 7, characterized in that: One end of the fixed disk in the length direction is provided with an inwardly recessed groove, and the other end of the fixed disk in the length direction is provided with an arc-shaped protrusion.

9. The stator assembly of a compact brushless outer rotor motor according to claim 8, characterized in that: The interior of the base is communicated with the hollow portion of the insertion end, and the embedding groove is communicated with the hollow portion of the insertion end.

Images