Brushless motor
By adopting circular casing and finishing technology in brushless motors, combined with positioning grooves, bumps and limit grooves, the problem of low assembly efficiency is solved, the stability and heat dissipation of the motor are achieved, and the stability and heat dissipation effect of the motor are improved. Assembly efficiency and motor performance.
Patent Information
- Application Number
- CN202420990366.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The assembly efficiency of existing brushless motors is low, resulting in complex accuracy problems such as coaxiality and complex process, which affects the stability and noise and vibration performance of the motor.
The circular casing design is adopted, and through the structures such as positioning grooves, positioning bumps, L-shaped limit grooves and step surfaces, the coaxiality of the stator assembly and the rotor assembly are ensured, and the bracket and plug slot are removed and connected. Simplify the assembly process and improve assembly efficiency.
It realizes the high-speed and stable operation of the motor, reduces noise and vibration, simplifies the assembly process, improves assembly efficiency, promotes heat dissipation inside the motor, and extends the service life.
Smart Images
Figure CN222262358U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field related to brushless motors, in particular to a brushless motor. Background Art
[0002] Brushless motors are also called brushless DC motors. As a small and efficient motor, brushless motors are widely used in various fields and are deeply loved by major industries. At present, brushless motors include a rotor and a stator sleeved on the outer circumference of the rotor.
[0003] In the prior art, in order to ensure the coaxiality and other precision issues of the brushless motor, the process used during assembly is relatively complicated, resulting in low assembly efficiency of the motor. Utility Model Content
[0004] The utility model aims to overcome the disadvantage of low motor assembly efficiency in the prior art and provides a brushless motor which is beneficial to improving assembly efficiency.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A brushless motor comprises a casing, a rotor assembly and a stator assembly, wherein the casing is in the shape of a circular ring, and a plurality of positioning grooves uniformly distributed along the circumference thereof are protrudingly provided on the inner side wall at the top end of the casing, and a plurality of positioning protrusions matching the positioning grooves are provided on the edge of the stator assembly, and one side of the positioning groove is connected with the side wall of the casing, and the other side corresponding to the positioning groove is provided with an L-shaped limiting groove, and a step surface matching the L-shaped limiting groove is provided on the outer edge of the stator assembly, and a mounting ring matching the rotor assembly is suspended and fixed at the center of the bottom end of the casing, and the stator assembly is sleeved on the rotor assembly and is in the same axial direction as the casing, and one end of the rotor assembly is located outside the stator assembly and is provided with a bracket, and a plurality of plug blocks are fixed on the edge of the bracket, and a plurality of slots matching the plurality of plug blocks are provided at the top end of the casing, and the bracket is detachably connected to the casing through the plug blocks matching the corresponding slots, and the other end of the rotor assembly is located outside the stator assembly and is detachably connected with a moving impeller after penetrating the mounting ring, and the rotor assembly is rotatably connected to the bracket and the mounting ring respectively.
[0007] The casing is in the shape of a circular ring, and a plurality of positioning grooves uniformly distributed along its circumference are protruded on the inner side wall at the top end of the casing, and a plurality of positioning protrusions matching the positioning grooves are provided at the edge of the stator assembly, one side of the positioning groove is connected with the side wall of the casing, and the other side corresponding to the positioning groove is provided with an L-shaped limiting groove, and the outer edge of the stator assembly is provided with a step surface matching the L-shaped limiting groove, and a mounting ring matching the rotor assembly is suspended and fixed at the center of the bottom end of the casing, the stator assembly is sleeved on the rotor assembly and is in the same axial direction as the casing, one end of the rotor assembly is located outside the stator assembly and is provided with a bracket, and a plurality of plug-in blocks are fixed on the edge of the bracket, and a plurality of slots matching the plurality of plug-in blocks are provided at the top end of the casing, and the bracket can be detachably connected to the casing by matching the plug-in blocks with the corresponding slots, the other end of the rotor assembly is located outside the stator assembly and is detachably connected with a moving impeller after passing through the mounting ring, and the rotor assembly is rotatably connected to the bracket and the mounting ring respectively. When the casing is fine-machined, the outer circumferential surface of the casing is taken as the core base point, and the L-shaped limiting groove for positioning the outer circumferential surface of the stator assembly is fine-machined by using the outer circumferential surface of the casing as the machining reference; the stator assembly is sleeved on the outer side wall of the rotor assembly and inserted into the casing at the same time, so that one end of the rotor assembly is rotatably connected with the mounting ring and passes through the mounting ring to be assembled with the impeller. In this process, the stator assembly is inserted into the corresponding positioning groove inside the casing through a number of positioning protrusions on its edge to prevent the stator assembly from rotating and misaligning. At the same time, the stator assembly is limited in the L-shaped limiting groove through the step surface to position the outer circumferential surface of the stator assembly. Positioning, ensuring the coaxiality of the stator assembly and the casing, and finally positioning the stator assembly; then installing the bracket, so that the bracket is inserted into the corresponding slot through several plug blocks on its edge, and at the same time, it is rotatably matched with the end of the rotor assembly and detachably connected to the casing and fixed, and finally ensuring the coaxiality of the stator assembly and the rotor assembly with the casing respectively, so as to ensure the stability of the motor when running at high speed, thereby helping to reduce noise and vibration, and the installation is simple and convenient, the assembly process is simple, and the purpose of improving assembly efficiency is achieved. When the motor is working, the impeller rotates synchronously with the stator assembly, which is beneficial to the heat dissipation of the motor.
[0008] Preferably, the rotor assembly includes a rotating shaft, two bearings are sleeved on the rotating shaft, the rotating shaft is rotatably connected to the bracket and the mounting ring through the two bearings, a magnetic ring and a positioning sleeve are sleeved on the rotating shaft, the magnetic ring is fixedly connected to the rotating shaft through the positioning sleeve and is located in the stator assembly. The magnetic ring is assembled to the rotating shaft through the positioning sleeve and then inserted into the stator assembly, and the two ends of the rotating shaft are rotatably connected to the bracket and the mounting ring through corresponding bearings, which is conducive to the high-speed rotation of the rotating shaft and reduces noise.
[0009] Preferably, the center of the bracket and the center of the mounting ring are both provided with an assembly groove matching the bearing, the assembly groove on the mounting ring is located at the top end surface of the mounting ring, and the impeller is located at the bottom of the mounting ring and there is a gap between the impeller and the mounting ring. When the casing is fine-machined, the outer circumferential surface of the casing is used as the core base point, and the side wall of the assembly groove on the mounting ring is fine-machined by using the outer circumferential surface of the casing as the machining reference to ensure the accuracy of the hole position when the bearing is assembled, thereby facilitating the coaxiality of the motor rotor assembly and the stator assembly; the impeller is located at the bottom of the mounting ring and there is a gap between the impeller and the mounting ring to facilitate the rotation of the impeller.
[0010] Preferably, the bracket is provided with a cover plate and a circuit board, the cover plate is provided with a number of evenly distributed heat dissipation holes, the cover plate is located at the top of the bracket, the rotor assembly is located at the bottom of the bracket, the cover plate is detachably connected to the top of the bracket, the circuit board is detachably installed between the cover plate and the bracket, and the circuit board is electrically connected to the stator assembly. The heat dissipation holes facilitate heat dissipation and air discharge under the action of the impeller, which is beneficial to prolonging the service life of the motor; after the bracket and the housing are assembled, the circuit board is limited to the bracket, and finally the cover plate is covered so that the cover plate and the bracket are fixed to each other, so that the circuit board is positioned, the installation is simple and quick, and it is beneficial to improve the assembly efficiency.
[0011] Preferably, the stator assembly comprises an iron core, an upper frame and a lower frame, wherein the iron core is located between the upper frame and the lower frame and corresponds to the magnetic ring, the iron core is detachably connected to the upper frame and the lower frame respectively, the centers of the iron core, the upper frame and the lower frame are all provided with an axial hole matching the rotor assembly, the edge of the upper frame is fixed with a plurality of mounting seats, the top of the mounting seat is provided with a metal insert electrically connected to the circuit board, the metal insert is fixedly connected to the circuit board, the positioning protrusion is fixedly connected to the bottom of the mounting seat and is located on the side of the iron core. The stator winding is wound on the upper frame and the lower frame; after the circuit board is limited on the bracket, it is directly welded and fixed to the metal insert, which simplifies the process and improves the stability and reliability of the connection between the stator assembly and the circuit board.
[0012] Preferably, the outer diameters of the upper frame and the lower frame are smaller than the outer diameter of the core, the edge of the upper frame is provided with a plurality of grooves evenly distributed along its circumference, a clamping groove matching the bracket is formed between the groove and the top surface of the core, the clamping groove is located on the side of the mounting seat, the step surface is located on the bottom edge of the core, and the end surfaces of the plurality of L-shaped limiting grooves together constitute a limiting area matching the lower frame. The bracket is limited in the corresponding clamping groove, which is conducive to preventing the bracket from rotating and misaligning and ensuring the stability of the structure; the limiting area is used to position the outer cylindrical surface of the stator assembly, which is conducive to ensuring the coaxiality of the stator assembly and the housing.
[0013] Preferably, the bracket includes a center block, the rotor assembly is rotatably connected to the center block, a plurality of L-shaped support arms are provided at the edge of the center block, and the plurality of support arms are evenly distributed along the circumference of the center block, one end of the support arm is fixedly connected to the center block, the other end of the support arm matches the snap-in groove and is located at the bottom of the center block, the snap-in groove is located on the inner side of the support arm, the plug block is located on the outer side of the support arm and fixedly connected to the support arm, the support arm is provided with a countersunk hole arranged along the axial direction of the casing, the countersunk hole is located between the snap-in groove and the plug block, a bolt is provided in the countersunk hole, a plurality of threaded tubes matching the bolts are protruding and fixed on the inner side wall of the casing, the bracket is detachably connected to the casing by matching the bolts with the threaded tubes one by one, a limiting boss extends on the support arm, the circuit board is suspended and limited at the top of the center block through the inner side of the limiting boss, and the cover plate is snap-connected to the outer side of the limiting boss. The central block on the bracket is convenient for rotational connection with the rotor assembly. The bracket is connected and positioned with the casing through a number of L-shaped support arms, so that a heat dissipation channel is formed between each two adjacent support arms, which is convenient for the passage of airflow under the action of the impeller, thereby facilitating the heat dissipation inside the motor and the circuit board; the bracket is matched with the corresponding card slot through the inner side of the support arm, and is inserted into the corresponding slot through the plug block on the outer side of the support arm, and at the same time, after rotationally matching with the end of the rotor assembly, it is detachably connected and fixed to the casing by tightening the bolts; the circuit board is limited to the inner side of the limiting boss on the top of the central block, and is electrically connected and fixed to the metal insert on the stator assembly by welding, and finally the cover plate is connected by a snap buckle, which is simple and convenient to install and has a simple assembly process.
[0014] Preferably, a wind hood is provided at the bottom end of the casing, one end of the wind hood is provided with an L-shaped matching groove matching the outer side of the casing, the wind hood is fixedly connected to the casing via the L-shaped matching groove, the impeller is located in the wind hood, an air inlet 1 is provided at the center of the other end of the wind hood, a sealing groove is provided at the air inlet, the sealing groove is located in the wind hood, a sealing sponge is fixed in the sealing groove, the top center of the impeller is detachably connected to the rotor assembly, the bottom center of the impeller is provided with an air inlet 2, the edge of the air inlet 2 is folded outward along the axial direction of the casing and contacts with the sealing sponge. Since the outer circumferential surface of the casing is used as the processing reference during the fine machining of the casing, the hood is matched with the outer side of the casing through the L-shaped matching groove, which is conducive to ensuring the coaxiality of the hood and the casing; an EPDM sealing sponge is fixed in the hood, and the soft and easy-to-cut nature of the EPDM sealing sponge is utilized to allow the EPDM sealing sponge and the rotating impeller to be in close contact without affecting the rotation of the impeller, thereby ensuring the sealing between the impeller and the hood when the impeller rotates.
[0015] Preferably, the impeller is provided with a plurality of arc-shaped blades, which are evenly distributed along the circumference of the impeller, one side of the blade is fixedly connected to the top side of the impeller, and the other side of the blade is fixedly connected to the bottom side of the impeller, one end of the blade is located at the edge of the impeller, a gap is formed between the edge of the impeller and the side wall of the casing, and the other end of the blade is located in the second air inlet and corresponds to the side wall of the first air inlet up and down. This design allows the airflow to enter the impeller through the first and second air inlets in turn during the rotation of the impeller, and then flow upward through the gap driven by the arc-shaped blades to dissipate heat inside the motor, and then blow to the surface of the circuit board through the bracket to dissipate heat from the circuit board.
[0016] Preferably, a plurality of connecting rods are provided on the outer wall of the mounting ring, and the plurality of connecting rods are evenly distributed along the circumference of the mounting ring. The mounting ring is fixedly connected to the side wall of the housing through the connecting rods, and the connecting rods are located at the top of the mounting ring. An air guide wheel is sleeved on the outer wall of the mounting ring, and the air guide wheel is located at the bottom of the mounting ring. The center of the air guide wheel is fixedly connected to the mounting ring. The air guide wheel is provided with a circular guide area corresponding to the gap, and a plurality of guide vanes evenly distributed along the circumference of the air guide wheel are fixed in the guide area, and the guide vanes are arranged obliquely. The air guide wheel plays an effective role in guiding the airflow inside the motor, guiding the airflow entering the gap upward, dissipating the heat inside the motor, and then blowing it to the surface of the circuit board through the bracket to dissipate the heat of the circuit board.
[0017] The beneficial effects of the utility model are: preventing the stator assembly from rotating and dislocating; ensuring the coaxiality of the stator assembly, the rotor assembly and the fan cover with the casing respectively, so as to ensure the stability of the motor when it runs at high speed, thereby helping to reduce noise and vibration, and the installation is simple and convenient, the assembly process is simple, and the purpose of helping to improve the assembly efficiency is achieved; it is beneficial to the heat dissipation inside the motor and the circuit board; the stability and reliability of the connection between the stator assembly and the circuit board are improved; it is beneficial to prevent the bracket from rotating and dislocating, and ensure the stability of the structure; and it ensures the sealing between the impeller and the fan cover when the impeller rotates. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the utility model;
[0019] Figure 2 It is an exploded view of the utility model;
[0020] Figure 3 It is the front view of the utility model;
[0021] Figure 4 yes Figure 3 Sectional view of AA in the middle;
[0022] Figure 5 It is a schematic diagram of the structure of the casing;
[0023] Figure 6 is a schematic diagram of the structure of the stator assembly;
[0024] Figure 7 It is a structural schematic diagram of the stator assembly and the rotor assembly when they are matched;
[0025] Figure 8 It is a schematic diagram of the structure in which a circuit board is limited on a bracket.
[0026] In the figure: 1. housing, 2. rotor assembly, 3. stator assembly, 4. positioning groove, 5. positioning convex block, 6. L-shaped limiting groove, 7. step surface, 8. mounting ring, 9. bracket, 10. insert block, 11. slot, 12. impeller, 13. rotating shaft, 14. bearing, 15. magnetic ring, 16. positioning sleeve, 17. assembly groove, 18. cover plate, 19. circuit board, 20. iron core, 21. upper frame, 22. lower frame, 23. shaft hole, 24. mounting seat, 25. metal insert, 26. groove, 27. snap-on groove, 28. center block, 29. support arm, 30. countersunk hole, 31. threaded tube, 32. limiting convex platform, 33. wind cover, 34. L-shaped matching groove, 35. Air inlet 1, 36. Sealing groove, 37. Air inlet 2, 38. Curved blades, 39. Gap, 40. Connecting rod, 41. Air guide wheel, 42. Guide vane. DETAILED DESCRIPTION
[0027] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.
[0028] like Figure 1 , Figure 2 and Figure 3 In the embodiment described, a brushless motor comprises a housing 1, a rotor assembly 2 and a stator assembly 3. The housing 1 is in the shape of a circular ring. Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, a plurality of positioning grooves 4 are protrudingly provided on the inner side wall of the top end of the casing 1 and are evenly distributed along the circumference thereof, a plurality of positioning protrusions 5 are provided on the edge of the stator assembly 3 and are matched with the positioning grooves 4 one by one, one side of the positioning groove 4 is connected with the side wall of the casing 1, and an L-shaped limiting groove 6 is provided on the other side corresponding to the positioning groove 4, and a step surface 7 matching the L-shaped limiting groove 6 is provided on the outer edge of the stator assembly 3, and a mounting ring 8 matching the rotor assembly 2 is suspended and fixed in the center of the bottom end of the casing 1, and the stator assembly 3 is sleeved on the rotor assembly 2 The rotor assembly 2 is arranged on the upper side and is in the same axial direction as the casing 1. One end of the rotor assembly 2 is located outside the stator assembly 3 and is provided with a bracket 9. A plurality of plug blocks 10 are fixed to the edge of the bracket 9. A plurality of slots 11 matching the plurality of plug blocks 10 are provided at the top of the casing 1. The bracket 9 is detachably connected to the casing 1 through the plug blocks 10 matching the corresponding slots 11. The other end of the rotor assembly 2 is located outside the stator assembly 3 and is detachably connected with a moving impeller 12 after passing through the mounting ring 8. The rotor assembly 2 is rotatably connected to the bracket 9 and the mounting ring 8 respectively.
[0029] like Figure 4 and Figure 7 As shown, the rotor assembly 2 includes a rotating shaft 13, on which two bearings 14 are sleeved. The rotating shaft 13 is rotatably connected to the bracket 9 and the mounting ring 8 respectively through the two bearings 14. The rotating shaft 13 is sleeved with a magnetic ring 15 and a positioning sleeve 16. The magnetic ring 15 is fixedly connected to the rotating shaft 13 through the positioning sleeve 16 and is located in the stator assembly 3.
[0030] like Figure 4 and Figure 5 As shown, the center of the bracket 9 and the center of the mounting ring 8 are both provided with an assembly groove 17 matching the bearing 14, the assembly groove 17 on the mounting ring 8 is located at the top end surface of the mounting ring 8, and the impeller 12 is located at the bottom of the mounting ring 8 and there is a gap between the impeller 12 and the mounting ring 8.
[0031] like Figure 1 , Figure 2 , Figure 4 and Figure 8 As shown, a cover plate 18 and a circuit board 19 are provided on the bracket 9, and a plurality of evenly distributed heat dissipation holes 20 are provided on the cover plate 18. The cover plate 18 is located at the top of the bracket 9, and the rotor assembly 2 is located at the bottom of the bracket 9. The cover plate 18 is detachably connected to the top of the bracket 9, and the circuit board 19 is detachably installed between the cover plate 18 and the bracket 9, and the circuit board 19 is electrically connected to the stator assembly 3.
[0032] like Figure 4 , Figure 6 and Figure 7As shown, the stator assembly 3 includes an iron core 21, an upper frame 22 and a lower frame 23. The iron core 21 is located between the upper frame 22 and the lower frame 23 and corresponds to the magnetic ring 15. The iron core 21 is detachably connected to the upper frame 22 and the lower frame 23 respectively. The centers of the iron core 21, the upper frame 22 and the lower frame 23 are all provided with axial holes 24 matching the rotor assembly 2. A plurality of mounting seats 25 are fixed to the edge of the upper frame 22. A metal insert 26 electrically connected to the circuit board 19 is provided on the top of the mounting seat 25. The metal insert 26 is fixedly connected to the circuit board 19. The positioning protrusion 5 is fixedly connected to the bottom of the mounting seat 25 and is located on the side of the iron core 21. The outer diameters of the upper skeleton 22 and the lower skeleton 23 are both smaller than the outer diameter of the iron core 21. The edge of the upper skeleton 22 is provided with a plurality of grooves 27 evenly distributed along its circumference. A snap-in groove 28 matching the bracket 9 is formed between the groove 27 and the top surface of the iron core 21. The snap-in groove 28 is located on the side of the mounting seat 25. The step surface 7 is located on the bottom edge of the iron core 21. The end faces of a plurality of L-shaped limit grooves 6 together constitute a limit area matching the lower skeleton 23.
[0033] like Figure 4 and Figure 8 As shown, the bracket 9 includes a center block 29, the rotor assembly 2 is rotatably connected to the center block 29, a plurality of L-shaped support arms 30 are provided at the edge of the center block 29, and the plurality of support arms 30 are evenly distributed along the circumference of the center block 29, one end of the support arm 30 is fixedly connected to the center block 29, the other end of the support arm 30 matches the clamping groove 28 and is located at the bottom of the center block 29, the clamping groove 28 is located on the inner side of the support arm 30, the plug block 10 is located on the outer side of the support arm 30 and is fixedly connected to the support arm 30, and the support arm 30 is provided with There is a countersunk hole 31 arranged along the axial direction of the casing 1, the countersunk hole 31 is located between the snap-in groove 28 and the plug block 10, a bolt is arranged in the countersunk hole 31, a plurality of threaded tubes 32 matching the bolts are protruding and fixed on the inner wall of the casing 1, the bracket 9 is detachably connected to the casing 1 by the bolts matching the threaded tubes 32 one by one, a limiting boss 33 extends from the support arm 30, the circuit board 19 is suspended on the top of the center block 29 through the inner side of the limiting boss 33, and the cover plate 18 is snap-connected with the outer side of the limiting boss 33.
[0034] like Figure 2 and Figure 4As shown, a hood 34 is provided at the bottom end of the casing 1, and an L-shaped matching groove 35 matching the outer side of the casing 1 is provided at one end of the hood 34, and the hood 34 is fixedly connected to the casing 1 through the L-shaped matching groove 35, and the impeller 12 is located in the hood 34, and an air inlet 1 36 is provided at the center of the other end of the hood 34, and a sealing groove 37 is provided at the air inlet 1 36, and the sealing groove 37 is located in the hood 34, and a sealing sponge is fixed in the sealing groove 37, and the top side center of the impeller 12 is detachably connected to the rotor assembly 2, and the bottom side center of the impeller 12 is provided with an air inlet 2 38, and the edge of the air inlet 2 38 is folded outward along the axial direction of the casing 1 and contacts with the sealing sponge.
[0035] like Figure 2 and Figure 4 As shown, a plurality of arc-shaped blades 39 are provided in the impeller 12, and the plurality of arc-shaped blades 39 are evenly distributed along the circumference of the impeller 12, one side of the blade is fixedly connected to the top side of the impeller 12, and the other side of the blade is fixedly connected to the bottom side of the impeller 12, one end of the blade is located at the edge of the impeller 12, and a gap 40 is formed between the edge of the impeller 12 and the side wall of the casing 1, and the other end of the blade is located in the second air inlet 38 and corresponds to the side wall of the first air inlet 36 in the upper and lower directions.
[0036] like Figure 2 , Figure 4 and Figure 5 As shown, a plurality of connecting rods 41 are provided on the outer wall of the mounting ring 8, and the plurality of connecting rods 41 are evenly distributed along the circumference of the mounting ring 8. The mounting ring 8 is fixedly connected to the side wall of the casing 1 through the connecting rods 41, and the connecting rods 41 are located at the top of the mounting ring 8. An air guide wheel 42 is sleeved on the outer wall of the mounting ring 8, and the air guide wheel 42 is located at the bottom of the mounting ring 8. The center of the air guide wheel 42 is fixedly connected to the mounting ring 8. A circular guide area corresponding to the gap 40 is provided on the air guide wheel 42, and a plurality of guide vanes 43 evenly distributed along the circumference of the air guide wheel 42 are fixed in the guide area, and the guide vanes 43 are arranged obliquely.
[0037] The casing 1 is a cast aluminum structure. When the casing 1 is finely machined, the outer circumferential surface of the casing 1 is used as the core base point. The outer circumferential surface of the casing 1 is used as the machining reference to perform one-time fine machining and forming of the side wall of the L-shaped limit groove 6 for positioning the outer circumferential surface of the stator assembly 3 and the side wall of the assembly groove 17 for assembling the bearing 14; the magnetic ring 15 is assembled to the rotating shaft 13 through the positioning sleeve 16, and then inserted into the stator assembly 3. The bottom end of the rotating shaft 13 is rotatably connected with the mounting ring 8 through the corresponding bearing 14 and the corresponding assembly groove 17. The rotating shaft 13 passes through the mounting ring 8 and is assembled with the impeller 12. In this process, the stator assembly 3 is inserted into the corresponding positioning groove 4 inside the casing 1 through several positioning protrusions 5 on its edge to prevent the stator assembly 3 from rotating and misaligning. At the same time, the stator assembly 3 is limited in the L-shaped limit groove 6 through the step surface 7 to position the outer circumferential surface of the stator assembly 3 to ensure that the stator assembly 3 and the casing 1, and finally the stator assembly 3 is positioned; then the bracket 9 is installed, and the bracket 9 is matched with the corresponding snap-in groove 27 through the inner side of the support arm 29, and the plug block 10 on the outer side of the support arm 29 is inserted into the corresponding slot 11, which is beneficial to prevent the bracket 9 from rotating and misaligning, and ensure the stability of the structure; the limiting area is used to position the outer cylindrical surface of the stator assembly 3, which is beneficial to ensure the coaxiality of the stator assembly 3 and the housing 1. At the same time, the top end of the rotating shaft 13 is rotatably connected with the center block 28 on the bracket 9 through the corresponding bearing 14 and the corresponding assembly groove 17, and finally the bolts are tightened to make the bracket 9 detachably connected and fixed to the housing 1; the circuit board 19 is limited to the inner side of the limiting boss 32 on the top of the center block 28; the circuit board 19 is electrically connected and fixed to the metal insert 25 on the stator assembly 3 by welding, and finally the cover plate 18 is covered by a snap connection, which is simple and convenient to install and has a simple assembly process.
[0038] The bracket 9 is connected and positioned with the casing 1 through a plurality of L-shaped support arms 29, so that a heat dissipation channel is formed between each two adjacent support arms 29; during the rotation of the impeller 12, the air flow enters the impeller 12 through the air inlet 1 35 and the air inlet 2 37 in turn, and then flows upward through the gap 39 driven by the arc blades 38 and under the guidance of the guide wheel 41, to dissipate the heat inside the motor, and then blows to the surface of the circuit board 19 through the bracket 9 to dissipate the heat of the circuit board 19.
Claims
1. A brushless motor, characterized in that: The invention comprises a housing (1), a rotor assembly (2) and a stator assembly (3), wherein the housing (1) is in the shape of a ring, a plurality of positioning grooves (4) evenly distributed along its circumference are protrudingly provided on the inner side wall at the top end of the housing (1), a plurality of positioning protrusions (5) matching the positioning grooves (4) are provided on the edge of the stator assembly (3), one side of the positioning groove (4) is connected to the side wall of the housing (1), the other side corresponding to the positioning groove (4) is provided with an L-shaped limiting groove (6), the outer edge of the stator assembly (3) is provided with a step surface (7) matching the L-shaped limiting groove (6), a mounting ring (8) matching the rotor assembly (2) is suspended and fixed at the center of the bottom end of the housing (1), and the stator assembly (3) is provided with a plurality of positioning protrusions (5) matching the positioning grooves (4) one by one. The subassembly (3) is sleeved on the rotor assembly (2) and has the same axial direction as the casing (1); one end of the rotor assembly (2) is located outside the stator assembly (3) and is provided with a bracket (9); a plurality of plug blocks (10) are fixed to the edge of the bracket (9); a plurality of slots (11) that match the plurality of plug blocks (10) are provided at the top of the casing (1); the bracket (9) is detachably connected to the casing (1) by matching the plug blocks (10) with the corresponding slots (11); the other end of the rotor assembly (2) is located outside the stator assembly (3) and is detachably connected to a moving impeller (12) after passing through a mounting ring (8); the rotor assembly (2) is rotatably connected to the bracket (9) and the mounting ring (8) respectively.
2. A brushless motor according to claim 1, characterized in that: The rotor assembly (2) comprises a rotating shaft (13), two bearings (14) are sleeved on the rotating shaft (13), the rotating shaft (13) is rotatably connected to a bracket (9) and a mounting ring (8) respectively via the two bearings (14), a magnetic ring (15) and a positioning sleeve (16) are sleeved on the rotating shaft (13), the magnetic ring (15) is fixedly connected to the rotating shaft (13) via the positioning sleeve (16) and is located in the stator assembly (3).
3. A brushless motor according to claim 2, characterized in that: The center of the bracket (9) and the center of the mounting ring (8) are both provided with an assembly groove (17) matching the bearing (14); the assembly groove (17) on the mounting ring (8) is located at the top end surface of the mounting ring (8); the impeller (12) is located at the bottom of the mounting ring (8) and there is a gap between the impeller and the mounting ring (8).
4. A brushless motor according to claim 2, characterized in that: The support (9) is provided with a cover plate (18) and a circuit board (19); the cover plate (18) is provided with a plurality of evenly distributed heat dissipation holes (20); the cover plate (18) is located at the top of the support (9); the rotor assembly (2) is located at the bottom of the support (9); the cover plate (18) is detachably connected to the top of the support (9); the circuit board (19) is detachably installed between the cover plate (18) and the support (9); and the circuit board (19) is electrically connected to the stator assembly (3).
5. A brushless motor according to claim 4, characterized in that: The stator assembly (3) comprises an iron core (21), an upper frame (22) and a lower frame (23); the iron core (21) is located between the upper frame (22) and the lower frame (23) and corresponds to the magnetic ring (15); the iron core (21) is detachably connected to the upper frame (22) and the lower frame (23); the centers of the iron core (21), the upper frame (22) and the lower frame (23) are all provided with an axial hole (24) matching the rotor assembly (2); a plurality of mounting seats (25) are fixed to the edge of the upper frame (22); a metal insert (26) electrically connected to the circuit board (19) is provided on the top of the mounting seat (25); the metal insert (26) is fixedly connected to the circuit board (19); the positioning protrusion (5) is fixedly connected to the bottom of the mounting seat (25) and is located on the side of the iron core (21).
6. A brushless motor according to claim 5, characterized in that: The outer diameters of the upper frame (22) and the lower frame (23) are both smaller than the outer diameter of the iron core (21); the edge of the upper frame (22) is provided with a plurality of grooves (27) evenly distributed along its circumference; a clamping groove (28) matching the bracket (9) is formed between the groove (27) and the top surface of the iron core (21); the clamping groove (28) is located on the side of the mounting seat (25); the step surface (7) is located on the bottom edge of the iron core (21); and the end surfaces of the plurality of L-shaped limiting grooves (6) together form a limiting area matching the lower frame (23).
7. A brushless motor according to claim 6, characterized in that: The bracket (9) comprises a center block (29), the rotor assembly (2) is rotatably connected to the center block (29), a plurality of L-shaped support arms (30) are provided at the edge of the center block (29), the plurality of support arms (30) are evenly distributed along the circumference of the center block (29), one end of the support arm (30) is fixedly connected to the center block (29), the other end of the support arm (30) matches the clamping groove (28) and is located at the bottom of the center block (29), the clamping groove (28) is located on the inner side of the support arm (30), the plug block (10) is located on the outer side of the support arm (30) and is fixedly connected to the support arm (30), and the upper side of the support arm (30) is provided with a plurality of L-shaped support arms (30). A countersunk hole (31) is arranged along the axial direction of the housing (1), the countersunk hole (31) is located between the clamping groove (28) and the plug block (10), a bolt is arranged in the countersunk hole (31), a plurality of threaded tubes (32) matching the bolts are protruding and fixed on the inner side wall of the housing (1), the bracket (9) is detachably connected to the housing (1) by the bolts matching the threaded tubes (32) one by one, a limiting boss (33) extends from the support arm (30), the circuit board (19) is suspended and limited on the top of the center block (29) through the inner side of the limiting boss (33), and the cover plate (18) is snap-connected to the outer side of the limiting boss (33).
8. A brushless motor according to claim 1, characterized in that: The bottom end of the casing (1) is provided with a hood (34), one end of the hood (34) is provided with an L-shaped matching groove (35) matching the outer side of the casing (1), the hood (34) is fixedly connected to the casing (1) via the L-shaped matching groove (35), the impeller (12) is located in the hood (34), the other end of the hood (34) is provided with an air inlet 1 (36) at the center, the air inlet 1 (36) is provided with a sealing groove (37), the sealing groove (37) is located in the hood (34), a sealing sponge is fixed in the sealing groove (37), the top side center of the impeller (12) is detachably connected to the rotor assembly (2), the bottom side center of the impeller (12) is provided with an air inlet 2 (38), the edge of the air inlet 2 (38) is folded outwardly along the axial direction of the casing (1) and contacts the sealing sponge.
9. A brushless motor according to claim 8, characterized in that: A plurality of arc-shaped blades (39) are arranged in the impeller (12), and the plurality of arc-shaped blades (39) are evenly distributed along the circumference of the impeller (12); one side of the blade is fixedly connected to the top side of the impeller (12), and the other side of the blade corresponding to the impeller is fixedly connected to the bottom side of the impeller (12); one end of the blade is located at the edge of the impeller (12), and a gap (40) is formed between the edge of the impeller (12) and the side wall of the casing (1); and the other end of the blade is located in the second air inlet (38) and corresponds to the side wall of the first air inlet (36) in an upper and lower manner.
10. A brushless motor according to claim 9, characterized in that: A plurality of connecting rods (41) are provided on the outer wall of the mounting ring (8), and the plurality of connecting rods (41) are evenly distributed along the circumference of the mounting ring (8). The mounting ring (8) is fixedly connected to the side wall of the housing (1) via the connecting rods (41), and the connecting rods (41) are located at the top of the mounting ring (8). An air guide wheel (42) is sleeved on the outer wall of the mounting ring (8), and the air guide wheel (42) is located at the bottom of the mounting ring (8). The center of the air guide wheel (42) is fixedly connected to the mounting ring (8). The air guide wheel (42) is provided with a circular annular guide area corresponding to the gap (40), and a plurality of guide vanes (43) evenly distributed along the circumference of the air guide wheel (42) are fixed in the guide area, and the guide vanes (43) are arranged in an inclined manner.