An outer rotor motor

Abstract

The present invention discloses an outer rotor motor, belonging to the technical field of motors, and includes an end cover assembly, wherein the end cover assembly includes an end cover and a cover plate adapted to the end cover, wherein a receiving groove is provided on the end cover, wherein the receiving groove is provided with an adapted volumetric insulating cover, and a PCB board assembly is provided inside the insulating cover. In this solution, a volumetric insulating cover is arranged inside the end cover to accommodate and glue-fill the PCB board assembly, so that the PCB board assembly can be independent of the end cover assembly. When the PCB board assembly is damaged, the PCB board assembly can be replaced by simply removing the volumetric insulating cover, and the entire end cover assembly does not need to be replaced, which greatly reduces the difficulty of later maintenance of the motor. The insulating cover and the PCB board assembly are glue-filled as one, and can be glue-filled in advance and then installed in the end cover assembly, or glue-filled after being installed in the end cover assembly. The receiving groove on the end cover can accommodate the PCB board assembly and the insulating cover, and the cover plate can encapsulate the end cover.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more particularly to an outer rotor motor. Background Art

[0002] In the EC motor of the prior art, the electric control box where the PCB board is located is the weak link of the entire motor protection. For use scenarios with high humidity, a glue-filling structure is generally used. The PCB board is potted with a two-component liquid resin mixture, and then the mixed resin is cured to encapsulate the PCB board. This can improve the PCB board's resistance to moisture and vibration, and can improve the heat dissipation of devices on the PCB board (generally, the thermal conductivity of the potting colloid is 10 times that of air). After the motor is installed in a use scenario such as a fan, the PCB board is the most prone to failure. For a motor with a potted PCB board, if a failure occurs, the entire motor or even the fan can only be dismantled and replaced, which is a huge workload.

[0003] For example: Chinese patent announcement number CN221103840U, announcement date June 7, 2024, the name of the utility model is a motor controller and a motor used therein, the application discloses a glue-filled end cap structure of a motor, a plurality of small copper bars are provided on the PCB board, the plurality of small copper bars are arranged on the high-current circuit on the PCB board, a glue-filling hole for glue-filling is provided on the end cap, the glue-filling hole is connected to the cavity, and the potting glue is poured into the cavity through the glue-filling hole, the controller box, PCB board, high-power device, a plurality of small copper bars and the end cap are formed into a whole, and by adding a small copper bar to the high-current circuit of the PCB board, the resistance of the high-current circuit is reduced, the current carrying capacity is increased, the heat generation of the high-current circuit is reduced, and the heat dissipation area of ​​the PCB board is increased, the heat dissipation effect is improved, and the overall heat dissipation capacity of the controller is enhanced. However, the motor cannot be disassembled separately after being filled with glue, which poses great difficulties for later maintenance. Summary of the invention

[0004] The present invention overcomes the problem that the PCB board of the existing EC outer rotor motor is difficult to maintain after being glued, and provides an outer rotor motor. This solution adopts a volumetric insulation cover and a PCB board to assemble and glue-fill, so that the PCB board can be disassembled separately, which is convenient for maintenance of the EC outer rotor motor.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: an outer rotor motor, including an end cover assembly, the end cover assembly includes an end cover and a cover plate adapted to the end cover, the end cover is provided with a receiving groove, the receiving groove is provided with an adapted volumetric insulating cover, and a PCB board assembly is provided inside the insulating cover. In this solution, the volumetric insulating cover is arranged inside the end cover to accommodate and fill the PCB board assembly with glue, so that the PCB board assembly can be independent of the end cover assembly. When the PCB board assembly is damaged, the PCB board assembly can be replaced by removing the volumetric insulating cover, and the entire end cover assembly does not need to be replaced, which greatly reduces the difficulty of later maintenance of the motor. The insulating cover and the PCB board assembly are filled with glue as a whole, and can be filled with glue in advance and then installed in the end cover assembly, or can be filled with glue after being installed in the end cover assembly. The receiving groove on the end cover can accommodate the PCB board assembly and the insulating cover, and the cover plate can encapsulate the end cover.

[0006] Preferably, the cover plate is provided with a through opening, a partition is provided between the through opening and the end cover, a first through hole is provided on the partition, and the PCB board assembly is partially embedded in the first through hole. The through opening on the cover plate can be used to inspect the internal structure of the end cover when the cover plate encapsulates the end cover, and the partition is arranged at the through opening position to block the space inside the end cover, so as to prevent dust and other debris from falling into the end cover assembly of the motor, and the first through hole on the partition is used to expose part of the PCB board assembly for electrical connection between the PCB board assembly and the outside.

[0007] Preferably, a sealing cover is provided on the cover plate, a cavity is formed between the partition and the sealing cover, and the partition protrudes toward one side of the cavity. The sealing cover can encapsulate the through port, and the cavity formed between the partition and the sealing cover is the position where the PCB board is connected to the outside world. The partition as a whole protrudes toward the cavity position, which can increase the space of the receiving slot in the end cover and has a good heat dissipation effect.

[0008] Preferably, the partition plate is connected to the cover plate by snap-fit ​​connection, the cover plate is nested with the end cover, and the sealing cover is nested with the cover plate. The partition plate and the cover plate are connected by snap-fit ​​connection, which is convenient for disassembly between the partition plate and the cover plate. The cover plate and the cover plate are nested in the form of an assembly groove, which is conducive to assembly and disassembly. The cover plate and the end cover also need to be fixedly connected. The sealing plate and the end cover are also nested in the form of an assembly groove, and are detachable, which is conducive to opening the sealing plate to electrically connect the PCB board assembly.

[0009] Preferably, the end cap and the partition form a second through hole, and the PCB board component is partially located in the second through hole. The end cap and the partition form the second through hole, which can connect the circuit on the PCB board component to the external terminal. The wiring part of the PCB board component needs to correspond to the position of the second through hole, which is convenient for wiring processing.

[0010] Preferably, the PCB board assembly comprises a PCB board, and a grounding assembly is arranged on the PCB board. The grounding assembly on the PCB board can play a role in safety protection for the PCB board assembly.

[0011] Preferably, the motor housing is adapted to the end cover assembly, and a plurality of annularly distributed openings are provided on the side of the motor housing away from the end cover assembly. The openings at the bottom of the motor housing (the end surface away from one end of the end cover assembly) can improve the heat dissipation condition of the motor, and can also prevent water from accumulating inside the rotor when the rotor is working downward.

[0012] Preferably, a rotor assembly is provided in the motor housing, and the rotor assembly includes a magnetic tile and a magnetic tile frame, and the magnetic tile is provided on the motor housing and the magnetic tile frame. The rotor assembly includes the motor housing, the magnetic tile and the magnetic tile frame. When the motor is working, the rotor assembly rotates, while the internal stator assembly is fixed. The magnetic tile, the magnetic tile frame and the motor housing are relatively fixed.

[0013] Preferably, the magnetic tile frame is provided with a plurality of scattered brackets, the outer ends of the brackets are provided with fixing rings, the outer ends of the brackets are bent and pass through the fixing rings to form assembly grooves. The fixing rings can fix the shape of the outer edge of the magnetic tile frame, and at the same time form assembly grooves for fixing and setting the magnetic tile structure.

[0014] Preferably, an annular baffle is provided at the inner end of the magnetic tile frame, and the annular baffle is arranged close to the opening and covers the opening. The annular baffle is used to fix the inner side of the magnetic tile frame, and the annular baffle has a large width to cover the opening at the bottom of the motor housing, so that it cannot directly pass to the stator winding while retaining the advantages of the opening, thereby improving the protection performance of the motor.

[0015] Compared with the prior art, the present invention has the following advantages: (1) it can realize the glue filling of detachable modular PCB board components, which is convenient for production and maintenance and replacement; (2) the skylight type external plug-in wiring structure makes it convenient for users to select the required functions; the design of the plug-in strip partition is ingenious, which saves materials and improves production efficiency; (3) the rotor magnetic tile frame can evenly divide the magnetic tiles, the cooling fan and the opening protection, which is beneficial to the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric drawing of the present invention.

[0017] Figure 2 It is a schematic diagram of the end cover structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the explosion between the cover plate, the sealing cover and the partition plate of the present invention.

[0019] Figure 4 It is an axonometric view of the partition of the present invention.

[0020] Figure 5 It is a schematic diagram of another viewing angle of the partition of the present invention.

[0021] Figure 6 It is a schematic diagram of the explosion of the rotor assembly of the present invention.

[0022] Figure 7 It is a schematic diagram of the magnetic tile frame structure of the present invention.

[0023] Figure 8 It is a cross-sectional view of the present invention.

[0024] In the figure: 1. end cover, 2. cover plate, 3. receiving groove, 4. insulation cover, 5. PCB board assembly, 5.1. PCB board, 5.2. grounding assembly, 6. through port, 7. partition plate, 8. first through hole, 9. cover, 10. cavity, 11. second through hole, 12. motor housing, 13. opening, 14. magnetic tile, 15. magnetic tile frame, 16. bracket, 17. fixing ring, 18. assembly groove, 19. annular baffle, 20. shaft, 21. placement groove, 22. countersunk hole, 23. bearing, 24. rotating shaft, 25. limiting sleeve, 26. Limiting annular block, 27. vertical ribs, 28. limiting steps, 29. grooves, 30. avoidance grooves, 31. limiting protrusions, 32.1. wire holes, 32.2. first wire holes, 32.3. second wire holes, 33.1. grounding holes, 33.2. first grounding holes, 33.3. second grounding holes, 34. sealing rings, 35. sides, 36. arcuate edges, 37. undercuts, 38. buckle holes, 39. terminals, 40. flanges, 41. first heat dissipation ribs, 42. second heat dissipation ribs, 43. third heat dissipation ribs, 44. stator assembly. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0026] Example 1: Figures 1 to 5 as well as Figure 8An outer rotor motor shown in the figure includes an end cover assembly, which includes an end cover 1 and a cover plate 2. A hollow shaft portion 20 is provided at one end of the end cover 1. The shaft portion 20 is located at the central axial position of the end cover 1 and can be adaptably connected to the motor housing 12. The other end of the end cover 1 has a receiving groove 3. The bottom center position of the receiving groove 3 is connected to the hollow area of ​​the shaft portion 20. A volumetric insulating cover 4, a PCB board assembly 5, a partition plate 7 and a cover plate 2 are arranged upward in sequence in the receiving groove 3. The volumetric insulating cover 4 matches the contour shape of the receiving groove 3, so that the volumetric insulating cover 4 can be assembled in the receiving groove 3. The volumetric insulating cover 4 is also provided with a PCB board assembly 5 placement groove 21. The PCB board 5.1 can be completely placed in the placement groove 21, and the PCB board 5.1 is integrated with the insulating cover 4 by glue filling. The insulating cover 4 is detachably connected to the receiving groove 3 of the end cover 1. In this way, when the PCB board assembly 5 fails, the volumetric insulating cover 4 can be removed separately to replace the PCB board assembly 5; the cover plate 2 can encapsulate the receiving groove 3 on the end cover 1 and have a sealing effect on the end cover assembly, and a smaller through-port 6 is provided on the cover plate 2, and a partition 7 is provided at the through-port 6. The partition 7 separates the internal receiving groove 3 of the end cover assembly from the external space, and can prevent dust and other debris from falling into the end cover assembly when the motor is inspected through the through-port 6.

[0027] Specifically, the bottom center of the receiving groove 3 of the end cover 1 is a countersunk hole 22 structure, and a hollow shaft portion 20 is axially extended downward. The hollow hole diameter of the shaft portion 20 is smaller than the hole diameter of the countersunk hole 22. A bearing 23 can be installed in the countersunk hole 22. A bearing mounting hole is also provided at one end of the shaft portion 20 away from the countersunk hole 22 for installing a second bearing 23. The rotating shaft 24 of the rotor assembly is arranged in the hollow shaft portion 20. One end of the rotating shaft 24 is connected to the bearing 23 in the countersunk hole 22, and the other end of the rotating shaft 24 passes through the second bearing 23 downward and extends to the bottom of the motor housing 12. An annular groove is also provided on the side of the end cover 1 away from the receiving groove 3. The annular groove can cooperate with the top opening of the motor housing 12 to achieve sliding engagement with the motor housing 12, and the bottom of the rotating shaft 24 is fixed to the motor housing 12, so that when the rotating shaft 24 rotates, it can drive the motor housing 12 to rotate. Specifically, a limiting sleeve 25 is provided at the bottom end of the rotating shaft 24, and the limiting sleeve 25 is sleeved on the outside of the rotating shaft 24. One end of the limiting sleeve 25 is located outside the motor housing 12, and the other end of the limiting sleeve 25 is located inside the motor housing 12. A limiting annular block 26 is provided on the side of the limiting sleeve 25 located outside the motor housing 12, and the limiting annular block 26 abuts against the bottom of the motor housing 12. The end of the limiting sleeve 25 located inside the motor housing 12 presses the bearing 23 on the lower side of the shaft portion 20.

[0028] The inner edge of the receiving groove 3 of the end cover 1 is provided with a plurality of vertical ribs 27, the length of which is consistent with the height of the groove wall of the receiving groove 3, which can play a role in strengthening the structure of the inner structure of the receiving groove 3 and ensure that the groove wall structure of the receiving groove 3 is more stable; and a plurality of limiting steps 28 are also provided at the bottom edge of the receiving groove 3, which can play a role in limiting the bottom of the volumetric insulation cover 4 placed in the receiving groove 3, so that the position of the insulation cover 4 can be fixed relative to the end cover 1. Specifically, the bottom of the volumetric insulation cover 4 is provided with a plurality of grooves 29, which can cooperate with the limiting steps 28 at the bottom of the receiving groove 3, so that the insulation cover 4 can be embedded in the receiving groove 3. In addition, the outer edge of the insulation cover 4 is provided with avoidance grooves 30 corresponding to the vertical ribs 27 to cooperate with the vertical ribs 27 structure on the receiving groove 3.

[0029] The PCB board assembly 5 includes a PCB board 5.1 and various components (such as a plug-in strip, terminal blocks, etc.) arranged on the PCB board 5.1. The structural shape of the PCB board 5.1 is adapted to the shape of the placement groove 21 in the insulating cover 4. Since the bottom of the insulating cover 4 is provided with a groove 29, a limiting protrusion 31 is formed in the placement groove 21 of the insulating cover 4. The limiting protrusion 31 can be used to limit the bottom of the PCB board 5.1, so that the PCB board 5.1 maintains a certain distance from the bottom of the placement groove 21 of the insulating cover 4, and the components on the PCB board 5.1 are higher than the position of the placement groove 21 of the insulating cover 4. When the PCB board assembly 5 and the insulating cover 4 are glued, it is only necessary to fill the placement groove 21 of the insulating cover 4 with glue, so that the PCB board 5.1 and the insulating cover 4 are glued as a whole. The glue will be located in the gap between the PCB board 5.1 and the bottom of the placement groove 21 of the insulating cover 4 and the position where the top of the PCB board 5.1 is flush with the notch of the placement groove 21, thereby ensuring the heat dissipation effect on both sides of the PCB board 5.1.

[0030] A wire passing hole 32 is also provided at the bottom of the accommodating groove 3 of the end cover 1. Corresponding to the position of the wire passing hole 32, a first wire passing hole 32.2 is provided on the placement groove 21 of the insulating cover 4, and a second wire passing hole 32.3 is provided on the PCB board 5.1. The first wire passing hole 32.2 is an axial long hole protruding toward the PCB board 5.1, and the second wire passing hole 32.3 is a perforation on the surface of the PCB board 5.1. The second wire passing hole 32.3 can be sleeved on the first wire passing hole 32.2, so that the PCB board 5.1 forms a limit function in the insulating cover 4. The wire passing hole 32.1, the first wire passing hole 32.2 and the second wire passing hole 32.3 can connect the wiring inside the motor to the position of the PCB board 5.1, which is convenient for circuit connection and avoids excessive wiring. Furthermore, a grounding hole 33.1 is further provided at the bottom of the receiving groove 3 of the end cover 1. Corresponding to the position of the grounding hole 33.1, a first grounding hole 33.2 is provided on the placement groove 21 of the insulating cover 4, and a second grounding hole 33.3 is provided on the PCB board 5.1. The first grounding hole 33.2 is an axial long hole protruding toward the PCB board 5.1, and the second grounding hole 33.3 is a through hole on the surface of the PCB board 5.1. The second grounding hole 33.3 can be sleeved on the first grounding hole 33.2. A grounding hole 33.2 and a first wire-passing hole 33.3 are formed, so that the PCB board 5.1 can be completely radially limited on the insulating cover 4; through the grounding hole 33.1, the first grounding hole 33.2 and the second grounding hole 33.3, the grounding component 5.2 inside the motor can be led to the PCB board 5.1. Specifically, the grounding component 5.2 includes a grounding screw, a conductive tube and a grounding copper foil, wherein the grounding screw can be tightened on the grounding hole 33.1 to achieve axial limitation of the PCB board 5.1.

[0031] After the PCB board assembly 5 is glued on the insulating cover 4, the cover plate 2 is needed to encapsulate the receiving groove 3 of the end cover 1. The cover plate 2 is the encapsulation structure of the end cover 1. The cover plate 2 and the end cover 1 are connected in a nested manner. Specifically, an annular protrusion is provided at the edge of the notch of the receiving groove 3 of the end cover 1, and an annular groove adapted to the annular protrusion is provided at the bottom of the cover plate 2, so that the cover plate 2 is buckled on the end cover 1. The annular groove and the annular protrusion can be matched together, so that the cover plate 2 can be fixedly matched on the end cover 1. A through opening 6 is also provided on the surface of the cover plate 2. The through opening 6 is rectangular in shape, and the through opening 6 is sealed and closed with a cover 9. An annular groove is provided at the position corresponding to the through opening 6 on the cover 9, and an annular protrusion is provided at the edge of the through opening 6. Similarly, the cover 9 and the through opening 6 on the cover plate 2 are also connected and fixed in a nested manner. It should be noted that a sealing ring 34 is also provided at the outer edge of the through-port 6 to seal the through-port 6 and ensure the sealing inside the end cover assembly after the sealing cover 9 is assembled.

[0032] A partition 7 is also provided at the position corresponding to the through-port 6. The top of the partition 7 is a rectangle that matches the shape of the through-port 6. However, the partition 7 is provided with only three side structures in the circumferential direction, specifically, two side edges 35 and an arc-shaped edge 36. Elastic undercuts 37 are provided at the four corner positions of the top of the partition 7. Button holes 38 that match the undercuts 37 are provided at the four corner positions of the through-port of the cover plate 2. By squeezing between the elastic undercuts 37 and the button holes 38, the undercuts 37 can be inserted into the button holes 38 to form a snap connection. When the undercuts 37 at the top of the cover plate 2 and the partition 7 are matched, a second through-port 11 is formed between the side of the partition 7 away from the arc-shaped edge 36 and the cover plate 2. Corresponding to the position of the second through-port 11, a terminal 39 can be installed on the wall of the receiving slot 3 of the end cover 1 for wiring the PCB board assembly 5 and the outside. A first through hole 8 is provided at the bottom of the partition 7, and the first through hole 8 can partially expose the PCB board assembly 5 in the cavity 10 formed between the partition 7 and the cover plate 2. Specifically, the wire strip and the terminal blocks on the PCB board 5.1 will be exposed in the cavity 10, and at the same time, the structures such as the wire strip and the terminal blocks are facing the second through hole 11 and connected to the terminal post 39.

[0033] The arc edge 36 on the partition 7 and the warped edge arranged on the first through hole 8 both protrude toward one side of the cavity 10. On the one hand, it can improve the structural strength of the partition 7, and on the other hand, it can also increase the space of the receiving groove 3 in the end cover 1, providing better heat dissipation effect for the internal PCB board assembly 5.

[0034] A flange 40 structure is also provided on the end cover 1. The flange 40 is a rib plate structure. The radial dimension of the flange 40 is larger than the radial dimension of the receiving groove 3 of the end cover 1, and the flange 40 is circular. A plurality of first heat dissipation ribs 41 are provided at the end of the flange 40 away from the receiving groove 3, a second heat dissipation rib 42 is provided on the outer wall of the receiving groove 3, and a third heat dissipation rib 43 is provided on the cover plate 2. The heat dissipation ribs on the end cover assembly can also achieve a good heat dissipation effect on the PCB board assembly 5 inside the end cover assembly, thereby ensuring the performance of the motor.

[0035] Example 2: Figures 1 to 8An outer rotor motor shown in the figure includes an end cover assembly, which includes an end cover 1 and a cover plate 2. A hollow shaft portion 20 is provided at one end of the end cover 1. The shaft portion 20 is located at the central axial position of the end cover 1 and can be adaptably connected to the motor housing 12. The other end of the end cover 1 has a receiving groove 3. The bottom center position of the receiving groove 3 is connected to the hollow area of ​​the shaft portion 20. A volumetric insulating cover 4, a PCB board assembly 5, a partition plate 7 and a cover plate 2 are arranged upward in sequence in the receiving groove 3. The volumetric insulating cover 4 matches the contour shape of the receiving groove 3, so that the volumetric insulating cover 4 can be assembled in the receiving groove 3. The volumetric insulating cover 4 is also provided with a PCB board assembly 5 placement groove 21. The PCB board 5.1 can be completely placed in the placement groove 21, and the PCB board 5.1 is integrated with the insulating cover 4 by glue filling. The insulating cover 4 is detachably connected to the receiving groove 3 of the end cover 1. In this way, when the PCB board assembly 5 fails, the volumetric insulating cover 4 can be removed separately to replace the PCB board assembly 5; the cover plate 2 can encapsulate the receiving groove 3 on the end cover 1 and have a sealing effect on the end cover assembly, and a smaller through-port 6 is provided on the cover plate 2, and a partition 7 is provided at the through-port 6. The partition 7 separates the internal receiving groove 3 of the end cover assembly from the external space, and can prevent dust and other debris from falling into the end cover assembly when the motor is inspected through the through-port 6.

[0036] Specifically, the bottom center of the receiving groove 3 of the end cover 1 is a countersunk hole 22 structure, and a hollow shaft portion 20 is axially extended downward. The hollow hole diameter of the shaft portion 20 is smaller than the hole diameter of the countersunk hole 22. A bearing 23 can be installed in the countersunk hole 22. A bearing mounting hole is also provided at one end of the shaft portion 20 away from the countersunk hole 22 for installing a second bearing 23. The rotating shaft 24 of the rotor assembly is arranged in the hollow shaft portion 20. One end of the rotating shaft 24 is connected to the bearing 23 in the countersunk hole 22, and the other end of the rotating shaft 24 passes through the second bearing 23 downward and extends to the bottom of the motor housing 12. An annular groove is also provided on the side of the end cover 1 away from the receiving groove 3. The annular groove can cooperate with the top opening of the motor housing 12 to achieve sliding engagement with the motor housing 12, and the bottom of the rotating shaft 24 is fixed to the motor housing 12, so that when the rotating shaft 24 rotates, it can drive the motor housing 12 to rotate. Specifically, a limiting sleeve 25 is provided at the bottom end of the rotating shaft 24, and the limiting sleeve 25 is sleeved on the outside of the rotating shaft 24. One end of the limiting sleeve 25 is located outside the motor housing 12, and the other end of the limiting sleeve 25 is located inside the motor housing 12. A limiting annular block 26 is provided on the side of the limiting sleeve 25 located outside the motor housing 12, and the limiting annular block 26 abuts against the bottom of the motor housing 12. The end of the limiting sleeve 25 located inside the motor housing 12 presses the bearing 23 on the lower side of the shaft portion 20.

[0037] The inner edge of the receiving groove 3 of the end cover 1 is provided with a plurality of vertical ribs 27, the length of which is consistent with the height of the groove wall of the receiving groove 3, which can play a role in strengthening the structure of the inner structure of the receiving groove 3 and ensure that the groove wall structure of the receiving groove 3 is more stable; and a plurality of limiting steps 28 are also provided at the bottom edge of the receiving groove 3, which can play a role in limiting the bottom of the volumetric insulation cover 4 placed in the receiving groove 3, so that the position of the insulation cover 4 can be fixed relative to the end cover 1. Specifically, the bottom of the volumetric insulation cover 4 is provided with a plurality of grooves 29, which can cooperate with the limiting steps 28 at the bottom of the receiving groove 3, so that the insulation cover 4 can be embedded in the receiving groove 3. In addition, the outer edge of the insulation cover 4 is provided with avoidance grooves 30 corresponding to the vertical ribs 27 to cooperate with the vertical ribs 27 structure on the receiving groove 3.

[0038] The PCB board assembly 5 includes a PCB board 5.1 and various components (such as a plug-in strip, terminal blocks, etc.) arranged on the PCB board 5.1. The structural shape of the PCB board 5.1 is adapted to the shape of the placement groove 21 in the insulating cover 4. Since the bottom of the insulating cover 4 is provided with a groove 29, a limiting protrusion 31 is formed in the placement groove 21 of the insulating cover 4. The limiting protrusion 31 can be used to limit the bottom of the PCB board 5.1, so that the PCB board 5.1 maintains a certain distance from the bottom of the placement groove 21 of the insulating cover 4, and the components on the PCB board 5.1 are higher than the position of the placement groove 21 of the insulating cover 4. When the PCB board assembly 5 and the insulating cover 4 are glued, it is only necessary to fill the placement groove 21 of the insulating cover 4 with glue, so that the PCB board 5.1 and the insulating cover 4 are glued as a whole. The glue will be located in the gap between the PCB board 5.1 and the bottom of the placement groove 21 of the insulating cover 4 and the position where the top of the PCB board 5.1 is flush with the notch of the placement groove 21, thereby ensuring the heat dissipation effect on both sides of the PCB board 5.1.

[0039] A wire passing hole 32 is also provided at the bottom of the accommodating groove 3 of the end cover 1. Corresponding to the position of the wire passing hole 32, a first wire passing hole 32.2 is provided on the placement groove 21 of the insulating cover 4, and a second wire passing hole 32.3 is provided on the PCB board 5.1. The first wire passing hole 32.2 is an axial long hole protruding toward the PCB board 5.1, and the second wire passing hole 32.3 is a perforation on the surface of the PCB board 5.1. The second wire passing hole 32.3 can be sleeved on the first wire passing hole 32.2, so that the PCB board 5.1 forms a limit function in the insulating cover 4. The wire passing hole 32.1, the first wire passing hole 32.2 and the second wire passing hole 32.3 can connect the wiring inside the motor to the position of the PCB board 5.1, which is convenient for circuit connection and avoids excessive wiring. Furthermore, a grounding hole 33.1 is further provided at the bottom of the receiving groove 3 of the end cover 1. Corresponding to the position of the grounding hole 33.1, a first grounding hole 33.2 is provided on the placement groove 21 of the insulating cover 4, and a second grounding hole 33.3 is provided on the PCB board 5.1. The first grounding hole 33.2 is an axial long hole protruding toward the PCB board 5.1, and the second grounding hole 33.3 is a through hole on the surface of the PCB board 5.1. The second grounding hole 33.3 can be sleeved on the first grounding hole 33.2. A grounding hole 33.2 and a first wire-passing hole 33.3 are formed, so that the PCB board 5.1 can be completely radially limited on the insulating cover 4; through the grounding hole 33.1, the first grounding hole 33.2 and the second grounding hole 33.3, the grounding component 5.2 inside the motor can be led to the PCB board 5.1. Specifically, the grounding component 5.2 includes a grounding screw, a conductive tube and a grounding copper foil, wherein the grounding screw can be tightened on the grounding hole 33.1 to achieve axial limitation of the PCB board 5.1.

[0040] After the PCB board assembly 5 is glued on the insulating cover 4, the cover plate 2 is needed to encapsulate the receiving groove 3 of the end cover 1. The cover plate 2 is the encapsulation structure of the end cover 1. The cover plate 2 and the end cover 1 are connected in a nested manner. Specifically, an annular protrusion is provided at the edge of the notch of the receiving groove 3 of the end cover 1, and an annular groove adapted to the annular protrusion is provided at the bottom of the cover plate 2, so that the cover plate 2 is buckled on the end cover 1. The annular groove and the annular protrusion can be matched together, so that the cover plate 2 can be fixedly matched on the end cover 1. A through opening 6 is also provided on the surface of the cover plate 2. The through opening 6 is rectangular in shape, and the through opening 6 is sealed and closed with a cover 9. An annular groove is provided at the position corresponding to the through opening 6 on the cover 9, and an annular protrusion is provided at the edge of the through opening 6. Similarly, the cover 9 and the through opening 6 on the cover plate 2 are also connected and fixed in a nested manner. It should be noted that a sealing ring 34 is also provided at the outer edge of the through-port 6 to seal the through-port 6 and ensure the sealing inside the end cover assembly after the sealing cover 9 is assembled.

[0041] A partition 7 is also provided at the position corresponding to the through-port 6. The top of the partition 7 is a rectangle that matches the shape of the through-port 6. However, the partition 7 is provided with only three side structures in the circumferential direction, specifically, two side edges 35 and an arc-shaped edge 36. Elastic undercuts 37 are provided at the four corner positions of the top of the partition 7. Button holes 38 that match the undercuts 37 are provided at the four corner positions of the through-port of the cover plate 2. By squeezing between the elastic undercuts 37 and the button holes 38, the undercuts 37 can be inserted into the button holes 38 to form a snap connection. When the undercuts 37 at the top of the cover plate 2 and the partition 7 are matched, a second through-port 11 is formed between the side of the partition 7 away from the arc-shaped edge 36 and the cover plate 2. Corresponding to the position of the second through-port 11, a terminal 39 can be installed on the wall of the receiving slot 3 of the end cover 1 for wiring the PCB board assembly 5 and the outside. A first through hole 8 is provided at the bottom of the partition 7, and the first through hole 8 can partially expose the PCB board assembly 5 in the cavity 10 formed between the partition 7 and the cover plate 2. Specifically, the wire strip and the terminal blocks on the PCB board 5.1 will be exposed in the cavity 10, and at the same time, the structures such as the wire strip and the terminal blocks are facing the second through hole 11 and connected to the terminal post 39.

[0042] The arc edge 36 on the partition 7 and the warped edge arranged on the first through hole 8 both protrude toward one side of the cavity 10. On the one hand, it can improve the structural strength of the partition 7, and on the other hand, it can also increase the space of the receiving groove 3 in the end cover 1, providing better heat dissipation effect for the internal PCB board assembly 5.

[0043] A flange 40 structure is also provided on the end cover 1. The flange 40 is a rib plate structure. The radial dimension of the flange 40 is larger than the radial dimension of the receiving groove 3 of the end cover 1, and the flange 40 is circular. A plurality of first heat dissipation ribs 41 are provided at the end of the flange 40 away from the receiving groove 3, a second heat dissipation rib 42 is provided on the outer wall of the receiving groove 3, and a third heat dissipation rib 43 is provided on the cover plate 2. The heat dissipation ribs on the end cover assembly can also achieve a good heat dissipation effect on the PCB board assembly 5 inside the end cover assembly, thereby ensuring the performance of the motor.

[0044] A stator assembly 44 and a rotor assembly are also provided inside the motor housing 12. The stator assembly 44 includes a stator winding provided on the outside of the shaft 20, and the rotor assembly includes a magnetic tile 14, a magnetic tile frame 15 and the motor housing 12 itself. The magnetic tile frame 15 includes a plurality of brackets 16 distributed in a ring-shaped scattered pattern. The brackets 16 are bent upward at the outer position and are provided with a fixing ring 17. The fixing ring 17 connects and fixes the outer edges of all the brackets 16 together, and the outer end of the bracket 16 passes through the fixing ring 17 and bends upward, and an assembly groove 18 is formed between two adjacent brackets 16 and on the fixing ring 17. A magnetic tile 14 structure can be installed on the upper side of each assembly groove 18. The magnetic tile 14 is a rectangular arc plate structure. When all the magnetic tiles 14 are assembled on the assembly groove 18, the magnetic tile 14 forms a cylindrical structure as a whole and fits with the inner wall of the motor housing 12. Specifically, An annular baffle 19 is provided on one side of the inner end of the magnetic tile frame 15. The annular baffle 19 is arranged in a horizontal plane, and the radial dimension of the annular baffle 19 is greater than the width dimension of the fixing ring 17; the fixing ring 17 can fix the shape of the outer edge of the magnetic tile frame 15, and at the same time form an assembly groove 18 for fixing the magnetic tile 14 structure; the annular baffle 19 is used to fix the inner side of the magnetic tile frame 15; one end of the annular baffle 19 of the magnetic tile frame 15 is fixed to the bottom of the motor housing 12, and one end of the fixing ring 17 of the magnetic tile frame 15 is tightly attached to the inner wall of the motor housing 12, so that the magnetic tile 14 arranged on the assembly groove 18 will also fit the inner wall of the motor housing 12. When the rotating shaft 24 drives the motor housing 12 to rotate, synchronously, the magnetic tile frame 15 and the magnetic tile 14 will also rotate together to work.

[0045] It should be noted that the bottom of the motor housing 12 is also provided with annular openings 13, and the number of the openings 13 is set to five (eg Figure 6 As shown, Figure 8The openings 13 are evenly distributed in a ring shape along the bottom of the motor housing 12. The openings 13 penetrate the bottom of the motor housing 12. The openings 13 can improve the heat dissipation conditions of the motor and prevent water from accumulating inside the rotor when it works downward. After the openings are made, the protection level of the motor will be reduced. Therefore, the annular baffle 19 on the magnetic tile frame 15 needs to correspond to the position of the openings 13, so that the annular baffle 19 can cover the openings 13 at the bottom of the motor housing 12, so that it cannot directly pass through the stator winding while retaining the advantages of the openings 13, thereby improving the protection performance of the motor. It should be noted that the bottom center of the motor housing 12 is a concave structure toward the motor housing, and the limiting annular block 26 on the limiting sleeve 25 can abut against the concave structure to form axial fixation; on the other hand, the center of the magnetic tile frame 15 is abutted and fixed against the concave structure inside the motor housing 12. Since the concave structure and the outer edge of the bottom of the motor housing 12 are not on the same plane, and the position of the concave structure is higher than the position of the outer edge, the annular baffle 19 on the magnetic tile frame 15 still maintains a certain gap with the bottom of the motor housing 12, so that the interior of the motor housing 12 can be ventilated and dissipated through the opening 13, which has a moisture-proof effect; it can also prevent external media from directly passing through the stator winding, thereby improving the protection performance of the motor while retaining the advantages of the opening 13.

Claims

1. An outer rotor motor, characterized in that: It comprises an end cover assembly, which comprises an end cover and a cover plate matched with the end cover, the end cover is provided with a receiving groove, the receiving groove is provided with a matching volumetric insulating cover, and a PCB board assembly is arranged inside the insulating cover.

2. An outer rotor motor according to claim 1, characterized in that: The cover plate is provided with a through opening, a partition is provided between the through opening and the end cover, a first through hole is provided on the partition, and the PCB board component is partially embedded in the first through hole.

3. An outer rotor motor according to claim 2, characterized in that: The cover plate is provided with a sealing cover, a cavity is formed between the partition plate and the sealing cover, and the partition plate protrudes toward one side of the cavity.

4. An outer rotor motor according to claim 3, characterized in that: The partition plate is connected to the cover plate by snapping, the cover plate is nested and connected to the end cover, and the sealing cover is nested and connected to the cover plate.

5. The outer rotor motor according to claim 3, characterized in that: The end cover and the partition plate form a second through hole, and the PCB board component is partially located in the second through hole.

6. The outer rotor motor according to claim 1, characterized in that: The PCB board assembly comprises a PCB board, and a grounding assembly is arranged on the PCB board.

7. An outer rotor motor according to any one of claims 1 to 6, characterized in that: It also includes a motor housing adapted to the end cover assembly, and a side of the motor housing away from the end cover assembly is provided with a plurality of annularly distributed openings.

8. An outer rotor motor according to claim 7, characterized in that: A rotor assembly is arranged in the motor housing. The rotor assembly comprises magnetic tiles and a magnetic tile frame. The magnetic tiles are arranged on the motor housing and the magnetic tile frame.

9. An outer rotor motor according to claim 8, characterized in that: The magnetic tile frame is provided with a plurality of scattered distributed brackets, the outer ends of the brackets are provided with fixing rings, and the outer ends of the brackets are bent and pass through the fixing rings to form assembly grooves.

10. An outer rotor motor according to claim 9, characterized in that: An annular baffle is provided at the inner end of the magnetic tile frame, and the annular baffle is arranged close to the opening and blocks the opening.

Images