An external rotor brushless motor

Abstract

The present invention discloses an outer rotor brushless motor, including a controller component, the controller component including a shell composed of a heat sink and a rear end cover, a conductive bracket and a PCBA board are arranged in the shell, a positioning structure is also arranged between the back of the heat sink and the conductive bracket, a waterproof and breathable mounting hole is arranged on the heat sink, a waterproof and breathable membrane, a sealing ring and a retaining ring are sequentially installed in the waterproof and breathable mounting hole from front to back, the retaining ring is interference fit with the waterproof and breathable mounting hole, a limiting plate part for limiting the retaining ring from escaping from the waterproof and breathable mounting hole is arranged on the conductive bracket, the limiting plate part covers the reverse side of the waterproof and breathable mounting hole and is provided with a through hole, the diameter of the through hole is smaller than the diameter of the retaining ring. The brushless motor can not only facilitate the positioning and installation of the conductive bracket and the heat sink, but also prevent the retaining ring from falling, thereby avoiding the short circuit phenomenon, extending the life of the brushless motor, and improving the reliability.

Description

Technical Field

[0001] The present invention relates to a brushless motor, and particularly to a device for controlling an automotive radiator fan. Background Art

[0002] Motors are commonly used power devices in various industries. Currently, brushless motors can be controlled through a PCBA board. The applicant previously applied for a drive motor for an automotive radiator fan, with the patent application number: CN201810896239.X. The specific structure of this drive motor can be referred to in the application documents. When the applicant was making further innovations, it was found that the above drive motor still had certain drawbacks, specifically as follows: 1. The conductive bracket of the above drive motor is placed in the conductive bracket installation area, and then the PCBA board is installed on the conductive bracket. Since there is no other positioning structure between the conductive bracket and the heat dissipation base, loosening may occur. At the same time, when the conductive bracket is placed in the conductive area, it may be difficult to ensure the fitting accuracy between them due to the machining accuracy of the heat dissipation base and the conductive bracket; 2. The inductor of the above drive motor is installed in the inductor installation area. Currently, this inductor installation area is a planar structure. The inductor is placed and fixed on the plane through thermal conductive glue. The pins of the inductor are placed on the conductive bracket and welded to the PCBA board. However, when the inductor is placed on the plane after being welded to the PCBA board, the thickness of the thermal conductive glue applied may be uneven, and the thermal conductive contact area between the thermal conductive glue and the cylindrical inductor is small, resulting in poor heat dissipation effect. At the same time, during the use of the motor or the installation process of the inductor, the insulating layer of the inductor may be damaged, causing the inductor to be in electrical contact with the heat dissipation base and resulting in a short circuit; 3. Currently, the length of the positioning slot is relatively long, and a large force is required to embed the conductive connecting rod into the positioning slot, increasing the assembly difficulty; 4. The heat dissipation effect of the current heat dissipation base of the brushless motor itself is not good enough, and the thermal conductive contact area between the PCBA board and the heat dissipation base is also relatively small, with a relatively low heat conduction efficiency; 5. Currently, the tail end of the conductive connecting rod passes through the hole of the PCBA board and is welded and fixed. However, for the reliability of welding, a section of the tail end of the conductive connecting rod needs to be exposed. Once the rear end cover is deformed during use, the rear end cover may touch the tail end of the conductive connecting rod, which may also cause a short circuit; 6. The shape of the heat dissipation base of the above motor has some angles, and the transition of the angles is very abrupt, resulting in a large difficulty in manufacturing the mold; 7. Currently, a waterproof and breathable membrane is provided on the heat dissipation base for waterproofing and breathing. Currently, the installation method of the waterproof and breathable membrane is that there are breathable installation holes on the heat dissipation base, the waterproof and breathable membrane is placed in the installation holes, and then through a sealing ring and an interference-fit retaining ring. However, during use, once there is a misoperation, pushing the waterproof and breathable membrane from the outside of the installation hole or the retaining ring may become loose during the operation of the motor, and finally fall out of the installation hole. The fallen retaining ring sways inside the motor, easily causing an internal short circuit. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an outer rotor brushless motor, which can not only facilitate the positioning and installation of the conductive bracket and the heat sink, but also prevent the retaining ring from falling off, thereby avoiding short circuit, extending the life of the brushless motor and improving reliability.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: an outer rotor brushless motor, including a controller component, the controller component includes a shell composed of a heat sink and a rear end cover, a conductive bracket and a PCBA board are arranged in the shell, a central axis is arranged on the front of the heat sink, an armature assembly is installed on the front of the heat sink, an outer rotor assembly is rotatably installed on the central axis, a capacitor installation area, an inductor installation area, a conductive bracket installation area, a wiring harness connector area and a heat conduction platform are arranged on the heat sink, the conductive bracket is placed in the conductive bracket installation area, a capacitor is installed in the capacitor installation area, an inductor is arranged in the inductor installation area, and three installation holes and a positioning groove are arranged on the back of the conductive bracket A conductive connecting rod is inserted into each mounting hole, and the inductor, capacitor, conductive connecting rod, and conductive pin of the wiring harness are all welded and fixed to the corresponding conductive holes on the PCBA board. The conductive connecting rod electrically connects the armature to the PCBA board. A positioning structure is also provided between the back of the heat sink and the conductive bracket. A waterproof and breathable mounting hole is provided on the heat sink. A waterproof and breathable membrane, a sealing ring, and a retaining ring are sequentially installed in the waterproof and breathable mounting hole from front to back. The retaining ring is interference fit with the waterproof and breathable mounting hole. A limiting plate portion for limiting the retaining ring from escaping from the waterproof and breathable mounting hole is provided on the conductive bracket. The limiting plate portion covers the reverse side of the waterproof and breathable mounting hole and is provided with a through hole, and the diameter of the through hole is smaller than the diameter of the retaining ring.

[0005] After adopting the above technical scheme, the effects of the present invention are as follows: 1. A positioning structure is also provided between the back side of the heat sink and the conductive bracket, so that the conductive bracket can be well installed on the heat sink through the positioning structure, thereby the assembly accuracy is higher; 2. A waterproof and breathable mounting hole is provided on the heat sink, and a waterproof and breathable membrane, a sealing ring and a retaining ring are installed in the waterproof and breathable mounting hole from front to back in sequence, and the retaining ring is interference fit with the waterproof and breathable mounting hole, and a limiting plate portion for limiting the retaining ring from escaping from the waterproof and breathable mounting hole is provided on the conductive bracket, and the limiting plate portion covers the reverse side of the waterproof and breathable mounting hole and is provided with a through hole, and the diameter of the through hole is smaller than the diameter of the retaining ring, so that after the retaining ring is installed in the mounting hole, due to the existence of the limiting plate portion, the retaining ring can be limited from escaping, and the through hole can facilitate the internal air and the motor The air outside the air passes through the waterproof and breathable membrane, even if the retaining ring and the mounting hole are loose, it cannot escape from the through hole, thus avoiding the risk of short circuit, extending the service life, and improving reliability.

[0006] As a preferred solution, the positioning structure includes a plurality of positioning posts arranged on the front surface of the conductive bracket, and corresponding positioning blind holes are provided on the back surface of the heat dissipation base and are in one-to-one correspondence and cooperation with the positioning posts. By inserting the positioning posts into the positioning blind holes, the guiding bracket can be well positioned to avoid loosening of the guiding bracket.

[0007] As a preferred solution, an inductor embedding groove for facilitating the embedding of inductor pins is provided on the conductive bracket, and an insulating sheet extending towards the inductor installation area is provided at the bottom of the inductor embedding groove. The insulating sheet is located between the inductor and the heat dissipation base. By using this insulating sheet, it can be padded at the bottom of the inductor, so that there is enough space between the inductor and the heat dissipation base to apply thermal conductive adhesive. At the same time, when the enameled wire of the inductor is broken, due to the existence of the insulating sheet, it can also avoid contact with the rest of the heat dissipation base and cause a short circuit.

[0008] As a preferred solution, the inductor installation area includes an installation plane and a quarter arc platform. The inductor is installed on the installation plane through thermal conductive adhesive, and the side surface of the inductor is thermally connected to the arc platform through thermal conductive adhesive. Therefore, the structure of the quarter arc platform can make one side of the inductor better conduct heat with the heat dissipation base through thermal conductive adhesive, increasing the conduction area and improving the heat dissipation effect.

[0009] As a preferred solution, the positioning embedding groove of the conductive bracket is a segmented embedding groove. By using this segmented embedding groove, the pressure for the tail of the conductive bracket to be embedded can be reduced, and the assembly is simpler.

[0010] As a preferred solution, the conductive bracket is a hollow structure. The conductive bracket includes a partition strip, a wire harness installation plate part, a central hole part, and a first installation hole part, a second installation hole part, and a third installation hole part on the outer periphery of the central hole part. The first installation hole part and the second installation hole part are closer to the capacitor installation area than the third installation hole part, and the second installation hole part is the closest to the wire harness installation plate part. The central hole part is connected to the three installation hole parts through connection strips respectively. The central hole part is on one side of the reference triangle formed by the three installation hole parts. Among them, the first installation hole part, the second installation hole part, and the partition strip are connected by connection strips and enclose a large hollow area. The heat conduction platform includes an outer heat conduction platform located outside the heat dissipation base and a hollow heat conduction platform in the large hollow area. The outer heat conduction platform is provided with a first extended heat conduction section and a second extended heat conduction section extending towards the center. The first extended heat conduction section extends between the first installation hole part and the partition strip and is located outside the large hollow area. The second extended heat conduction section extends between the first installation part and the second installation hole part and is located outside the large hollow area. This conductive bracket is more reasonable than the prior art, increasing the large hollow area, so that the size of the hollow heat conduction platform is increased. At the same time, the first extended heat conduction section and the second extended heat conduction section are conveniently arranged to further increase the heat conduction area and improve the heat conduction effect.

[0011] As a preferred solution, a number of heat dissipation grooves are provided on the front surface of the heat dissipation base, and the positions of the heat dissipation grooves are within the coverage range of the heat conduction platform. Due to the existence of the heat dissipation grooves, the entire thickness of the heat conduction platform is reduced, thereby further improving the heat dissipation effect.

[0012] As a preferred solution, the front surface of the heat dissipation base includes two heat dissipation regions. A number of heat dissipation fins are provided in one heat dissipation region, and a number of heat dissipation columns are provided in the other heat dissipation region. In this way, the front surface of the heat dissipation base not only has heat dissipation fins but also heat dissipation by the heat dissipation columns. The heat dissipation columns can be arranged in some remaining regions on the front surface of the heat dissipation base, and these regions are too small in area to be provided with heat dissipation fins. By arranging the heat dissipation columns, the heat dissipation in this region is further enhanced.

[0013] As a preferred solution, avoidance blind holes corresponding to the tails of the conductive connecting rods are provided on the rear end cover. Through the avoidance grooves, the tails of the conductive connecting rods can be avoided, so that even in a harsh environment, the tails of the conductive connecting rods will still not contact the rear end cover, avoiding the occurrence of open circuit phenomena.

[0014] As a preferred solution, a closed sealing rib is provided on the heat dissipation base, a closed sealing buckle groove adapted to the shape of the sealing rib is provided on the rear end cover, the shape of the rear end cover is adapted to the shape of the sealing buckle groove, and the included angles on the sealing buckle groove are all major arc angles. This shape of the rear end cover can reduce the processing difficulty of the mold, facilitate the molding of the rear end cover, and facilitate stress release. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the drawings and embodiments.

[0016] Figure 1 is a three-dimensional structure diagram of an embodiment of the present invention;

[0017] Figure 2 is an exploded schematic diagram of an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of the structure after the heat dissipation base and the conductive support are installed;

[0019] Figure 4 is a three-dimensional front view of the heat dissipation base;

[0020] Figure 5 is a three-dimensional rear view of the heat dissipation base;

[0021] Figure 6 is a front view of the heat dissipation base;

[0022] Figure 7 is a three-dimensional diagram of the conductive support;

[0023] Figure 8 is a perspective view of another angle of the conductive bracket;

[0024] Figure 9 is a perspective view of the rear end cover;

[0025] Figure 10 is a perspective view of the waterproof breathable film, the sealing ring and the retaining ring;

[0026] In the drawings: 1. Controller group; 11. Heat dissipation base; 111. Heat dissipation fins; 112. Heat dissipation columns; 113. Heat dissipation grooves; 114. Capacitor installation area; 115. Inductor installation area; 1151. Quarter arc platform; 116. Hollow heat conduction platform; 117. Peripheral heat conduction platform; 118. Second extended heat conduction section; 119. First extended heat conduction section; 1110. Conductive bracket installation area; 1111. Sealing edge; 1112. Waterproof breathable installation hole; 1113. Positioning blind hole; 12. Conductive bracket; 121. Partition strip; 122. Central hole part; 123. First installation hole part; 124. Second installation hole part; 125. Third installation hole part; 126. Wiring harness installation plate part; 127. Inductor embedding groove; 128. Insulating sheet; 129. Positioning embedding groove; 1210. Limiting plate part; 1211. Through hole; 1212. Connecting strip; 1213. Positioning column; 13. Rear end cover; 131. Sealing buckle groove; 132. Avoidance blind hole; 14. Waterproof breathable film; 15. Sealing ring; 16. Retaining ring; 2. Armature assembly; 3. Outer rotor assembly. Detailed implementation manners

[0027] The present invention will be further described in detail below through specific embodiments.

[0028] As Figures 1 to 10 shown, an outer rotor brushless motor includes a controller group 1, and the controller group 1 includes a housing composed of a heat dissipation base 11 and a rear end cover 13. A conductive bracket 12 and a PCBA board are arranged in the housing. A central shaft is arranged on the front surface of the heat dissipation base 11. An armature assembly 2 is installed on the front surface of the heat dissipation base 11. An outer rotor assembly 3 is rotatably installed on the central shaft. A capacitor installation area 114, an inductor installation area 115, a conductive bracket 12 installation area 1110, a wiring harness connector area and a heat conduction platform are arranged on the heat dissipation base 11. The conductive bracket 12 is placed in the conductive bracket 12 installation area 1110. A capacitor is installed in the capacitor installation area 114, and an inductor is arranged in the inductor installation area 115. The basic structure of the brushless motor in this embodiment is the same as the basic structure described in CN201810896239.X.

[0029] On the back of the conductive bracket 12, there are three mounting holes and a positioning groove 129. A conductive connecting rod is inserted into each mounting hole. The inductor, capacitor, conductive connecting rod, and wire harness conductive pins are all welded and fixed to the corresponding conductive holes on the PCBA board. The conductive connecting rod electrically connects the armature to the PCBA board. A positioning structure is also provided between the back of the heat dissipation base 11 and the conductive bracket 12. In this embodiment, the positioning structure includes a plurality of positioning posts 1213 provided on the front of the conductive bracket 12, and corresponding positioning blind holes 1113 are provided on the back of the heat dissipation base 11 to cooperate with the positioning posts 1213 one by one. By inserting the positioning posts 1213 into the positioning blind holes 1113, the guiding bracket can be well positioned and oriented, avoiding loosening of the guiding bracket. Of course, the positions of the positioning posts 1213 and the positioning blind holes 1113 can be interchanged. The positioning posts 1213 are provided on the heat dissipation base 11, and the positioning blind holes 1113 are provided on the conductive bracket 12. At this time, the positioning blind holes 1113 can be positioning through holes to facilitate the insertion and fitting of the positioning posts 1213.

[0030] The heat dissipation base 11 is provided with a waterproof and breathable mounting hole 1112. A waterproof and breathable membrane 14, a sealing ring 15, and a retaining ring 16 are sequentially installed in the waterproof and breathable mounting hole 1112 from the front to the back. The retaining ring 16 is in interference fit with the waterproof and breathable mounting hole 1112. The conductive bracket 12 is provided with a limiting plate portion 1210 for restricting the retaining ring 16 from disengaging from the waterproof and breathable mounting hole 1112. The limiting plate portion 1210 covers the back of the waterproof and breathable mounting hole 1112 and is provided with a through hole 1211. The diameter of the through hole 1211 is smaller than the diameter of the retaining ring 16. After the retaining ring 16 is installed in the mounting hole, due to the existence of the limiting plate portion 1210, the retaining ring 16 can be restricted from disengaging. And the diameter of the through hole 1211 is smaller than the diameter of the retaining ring 16, which not only facilitates the passage of internal air and external air of the motor through the waterproof and breathable membrane 14, but also prevents the retaining ring 16 from disengaging from the through hole 1211 even if there is looseness between the retaining ring 16 and the mounting hole. This avoids the risk of open circuit, extends the service life, and improves the reliability.

[0031] The conductive bracket 12 is provided with an inductor slot 127 for facilitating the insertion of inductor pins. An insulating sheet 128 extending towards the inductor mounting area 115 is provided at the bottom of the inductor slot 127. The insulating sheet 128 is located between the inductor and the heat dissipation base 11. By using the insulating sheet 128, it can be padded at the bottom of the inductor, so that there is enough space between the inductor and the heat dissipation base 11 to apply thermal conductive glue. At the same time, when the enameled wire of the inductor is broken, due to the existence of the insulating sheet 128, it can also avoid contact with the heat dissipation base 11 and cause an open circuit. The insulating sheet 128 and the conductive bracket 12 are integrally formed.

[0032] The inductor mounting area 115 includes a mounting plane and a quarter circular arc platform 1151. The inductor is mounted on the mounting plane through a thermal conductive adhesive, and the side surface of the inductor is thermally connected to the circular arc platform through the thermal conductive adhesive. Therefore, the structure of the quarter circular arc platform 1151 can enable one side of the inductor to better conduct heat with the heat dissipation base 11 through the thermal conductive adhesive, increasing the conduction area and improving the heat dissipation effect.

[0033] The positioning groove 129 of the conductive bracket 12 is a segmented groove, where the segmented groove is a structure formed by setting several notches on the original groove wall, facilitating the deformation of the side walls on both sides of the groove, thereby reducing the pressure required during embedding and making the assembly simpler.

[0034] As Figure 7 and Figure 8 As shown, the conductive bracket 12 is a hollow structure. The conductive bracket 12 includes a partition strip 121, a wire harness mounting plate portion 126, a central hole portion 122, and a first mounting hole portion 123, a second mounting hole portion 124, and a third mounting hole portion 125 located on the outer periphery of the central hole portion 122. The first mounting hole portion 123 and the second mounting hole portion 124 are closer to the capacitor mounting area 114 than the third mounting hole portion 125. The second mounting hole portion 124 is the closest to the wire harness mounting plate portion 126. The central hole portion 122 is respectively connected to the three mounting hole portions through connecting strips 1212. The central hole portion 122 is located on one side of the reference triangle formed by the three mounting hole portions. Among them, the first mounting hole portion 123, the second mounting hole portion 124, and the partition strip 121 are connected by connecting strips 1212 and enclose a large hollow area. The heat conduction platform includes an outer heat conduction platform 117 located outside the heat dissipation base 11 and a hollow heat conduction platform 116 located in the large hollow area. The outer heat conduction platform 117 is provided with a first extended heat conduction section 119 and a second extended heat conduction section 118 extending towards the center. The first extended heat conduction section 119 extends between the first mounting hole portion 123 and the partition strip 121 and is located outside the large hollow area. The second extended heat conduction section 118 extends between the first mounting portion and the second mounting hole portion 124 and is located outside the large hollow area. The conductive bracket 12 is more reasonable than the prior art, increasing the large hollow area, thus increasing the size of the hollow heat conduction platform 116. At the same time, the first extended heat conduction section 119 and the second extended heat conduction section 118 are conveniently arranged, further increasing the heat conduction area and improving the heat conduction effect.

[0035] A number of heat dissipation grooves 113 are provided on the front surface of the heat dissipation base. The positions of the heat dissipation grooves 113 are within the coverage range of the heat conduction platform. In this way, the thickness of the heat dissipation platform can be made as thin as possible, improving the heat dissipation effect while ensuring the strength.

[0036] The front of the heat dissipation base 11 includes two heat dissipation areas. In one of the heat dissipation areas, a number of heat dissipation fins 111 are provided, and in the other heat dissipation area, a number of heat dissipation columns 112 are provided. At the same time, heat dissipation is provided. In this way, not only are there heat dissipation fins 111 on the front of the heat dissipation base 11, but also heat dissipation fins 111 are provided at positions corresponding to the heat dissipation columns 112 on the back of the heat dissipation base 11, further enhancing the heat dissipation effect.

[0037] As Figure 9 described above, avoiding blind holes 132 corresponding to the tails of the conductive connecting rods are provided on the rear end cover 13. Through these avoiding grooves, the tails of the conductive connecting rods can be avoided. Even in a harsh environment, the tails of the conductive connecting rods will still not contact the rear end cover 13, preventing the occurrence of an open circuit phenomenon. And a closed sealing rib 1111 is provided on the heat dissipation base 11, and a closed sealing buckle groove 131 adapted to the shape of the sealing rib 1111 is provided on the rear end cover 13. The shape of the rear end cover 13 is adapted to the shape of the sealing buckle groove 131, and the included angles on the sealing buckle groove 131 are all obtuse arc angles. This shape of the rear end cover 13 can reduce the processing difficulty of the mold and also facilitate the molding of the rear end cover 13 and the release of stress.

[0038] The above-described embodiments are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and modifications made to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An outer-rotor brushless motor, comprising a controller assembly. The controller assembly includes a housing composed of a heat dissipation base and a rear end cover. A conductive bracket and a PCBA board are arranged inside the housing. A central shaft is provided on the front surface of the heat dissipation base. An armature assembly is mounted on the front surface of the heat dissipation base. An outer-rotor assembly is rotatably mounted on the central shaft. A capacitor mounting area, an inductor mounting area, a conductive bracket mounting area, a wire harness connector area, and a heat conduction platform are provided on the heat dissipation base. The conductive bracket is placed in the conductive bracket mounting area. A capacitor is mounted in the capacitor mounting area. An inductor is provided in the inductor mounting area. Three mounting holes and a positioning groove are provided on the back of the conductive bracket. A conductive connecting rod is inserted into each mounting hole. The inductor, capacitor, conductive connecting rod, and wire harness conductive pins are all welded and fixed to corresponding conductive holes on the PCBA board. The conductive connecting rod electrically connects the armature to the PCBA board. Characterized in that: A positioning structure is further provided between the back surface of the heat dissipation base and the conductive bracket. A waterproof and breathable mounting hole is provided on the heat dissipation base. A waterproof and breathable membrane, a sealing ring, and a retaining ring are sequentially mounted in the waterproof and breathable mounting hole from the front to the back. The retaining ring is in interference fit with the waterproof and breathable mounting hole. A limiting plate portion for restricting the retaining ring from disengaging from the waterproof and breathable mounting hole is provided on the conductive bracket. The limiting plate portion covers the back surface of the waterproof and breathable mounting hole and is provided with a through hole. The diameter of the through hole is smaller than the diameter of the retaining ring. The positioning structure includes a plurality of positioning posts provided on the front surface of the conductive bracket. Corresponding positioning blind holes are provided on the back surface of the heat dissipation base and are in one-to-one correspondence and cooperation with the positioning posts.

2. An outer-rotor brushless motor according to claim 1, Characterized in that: An inductor embedding groove for facilitating the embedding of inductor pins is provided on the conductive bracket. An insulating sheet extending towards the inductor mounting area is provided at the bottom of the inductor embedding groove. The insulating sheet is located between the inductor and the heat dissipation base.

3. An outer-rotor brushless motor according to claim 2, Characterized in that: The inductor mounting area includes a mounting plane and a quarter arc platform. The inductor is mounted on the mounting plane through a thermal conductive adhesive. The side surface of the inductor is thermally connected to the arc platform through a thermal conductive adhesive.

4. An outer-rotor brushless motor according to claim 3, Characterized in that: The positioning groove of the conductive bracket is a segmented groove.

5. An outer-rotor brushless motor according to claim 4, Characterized in that: The conductive bracket is of a hollow structure. The conductive bracket includes a partition strip, a wire harness mounting plate portion, a central hole portion, and a first mounting hole portion, a second mounting hole portion, and a third mounting hole portion located on the outer periphery of the central hole portion. The first mounting hole portion and the second mounting hole portion are closer to the capacitor mounting area than the third mounting hole portion. The second mounting hole portion is the closest to the wire harness mounting plate portion. The central hole portion is connected to the three mounting hole portions through connecting strips respectively. The central hole portion is located on one side of a reference triangle formed by the three mounting hole portions. Among them, the first mounting hole portion, the second mounting hole portion, and the partition strip are connected by connecting strips and enclose a large hollow area. The heat conduction platform includes an outer peripheral heat conduction platform located on the periphery of the heat dissipation seat and a hollow heat conduction platform located in the large hollow area. The outer peripheral heat conduction platform is provided with a first extended heat conduction section and a second extended heat conduction section extending towards the center. The first extended heat conduction section extends between the first mounting hole portion and the partition strip and is located outside the large hollow area. The second extended heat conduction section extends between the first mounting portion and the second mounting hole portion and is located outside the large hollow area.

6. The outer rotor brushless motor according to claim 5, characterized in that: A plurality of heat dissipation grooves are provided on the front surface of the heat dissipation seat, and the positions of the heat dissipation grooves are within the coverage range of the heat conduction platform.

7. The outer rotor brushless motor according to claim 6, characterized in that: The front surface of the heat dissipation seat includes two heat dissipation areas. One of the heat dissipation areas is provided with a plurality of heat dissipation fins, and the other heat dissipation area is provided with a plurality of heat dissipation columns.

8. The outer rotor brushless motor according to claim 7, characterized in that: Avoidance blind holes corresponding to the tails of the conductive connecting rods are provided on the rear end cover.

9. The outer rotor brushless motor according to claim 8, characterized in that: A closed sealing edge is provided on the heat dissipation seat, a closed sealing buckle groove adapted to the shape of the sealing edge is provided on the rear end cover, the shape of the rear end cover is adapted to the shape of the sealing buckle groove, and the included angles on the sealing buckle groove are all major arc angles.

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