Brushless direct current motor

Abstract

A rotor assembly is arranged in the stator assembly, the rotor assembly comprises a rotating shaft, a ball bearing is further arranged on the rotating shaft, the stator assembly comprises a stator winding, a lower end cover is arranged at the lower end of the stator winding, a first gear is rotatably connected to the lower end cover, and a second gear is rotatably connected to the first gear. The first gear is meshed with a second gear, a fixing plate is arranged above the first gear, the fixing plate is fixed on the lower end cover, a through hole is formed in the center of the fixing plate, the ball bearing is arranged in the through hole in a penetrating mode, a plurality of sliding grooves are formed in the fixing plate, and the sliding grooves are arranged in the radial direction of the center of the fixing plate. A sliding groove is formed in the first gear, a movable rod is arranged in the sliding groove in a sliding mode, a shaft pin is arranged on the movable rod, an arc-shaped groove is formed in the first gear, the shaft pin is arranged in the arc-shaped groove in a penetrating mode, a clamping block is arranged at the end of the movable rod, and the clamping block abuts against the ball bearing. The device can adapt to ball bearings of different specifications, and improves the adaptability and assembly efficiency of the motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a brushless DC motor. Background Technology

[0002] A brushless DC motor is a type of DC motor that uses electronic commutation instead of traditional brushes. It consists of a stator and a rotor, and during operation, an electronic controller precisely controls the direction of the current to drive the motor. Compared to brushed DC motors, brushless motors offer higher efficiency, longer lifespan, lower noise, and higher reliability, and are widely used in home appliances and other fields, such as floor scrubbers.

[0003] Existing brushless DC motors have poor adaptability. During the production process, end caps of different specifications need to be matched with corresponding bearings, which increases the complexity and time cost of assembly. This may lead to the selection of unsuitable bearings for assembly, resulting in unstable bearing installation and uneven gap between the bearing and the shaft, thus affecting the smooth operation of the motor. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a brushless DC motor that can adapt to ball bearings of different specifications, thereby improving the motor's adaptability and assembly efficiency.

[0005] To solve the above-mentioned technical problems, this utility model provides a brushless DC motor, including a stator assembly, within which a rotor assembly is provided. The rotor assembly includes a rotating shaft, on which an iron core is connected and can rotate synchronously with the shaft. The iron core has a slot, and a magnet is placed within the slot. A ball bearing is also provided on the rotating shaft. The stator assembly includes a stator winding, with an upper end cover at the upper end of the stator winding and a lower end cover at the lower end. A clamping mechanism is provided within the lower end cover, the clamping mechanism comprising components rotatably mounted on the lower end cover. A first gear meshes with a second gear. A fixed plate is provided above the first gear and is fixed to the lower end cover. The fixed plate has a through hole in its center, and the ball bearing passes through the through hole. The fixed plate has multiple sliding grooves, which are arranged radially along the center of the fixed plate. A movable rod is slidably arranged in the sliding groove, and a pin is provided on the movable rod. The first gear has an arc-shaped groove, and the pin passes through the arc-shaped groove. A clamping block is provided at the end of the movable rod, and the clamping block abuts against the ball bearing.

[0006] The lower end cover is provided with a mounting plate, and the mounting plate is provided with a fixed shaft, and the second gear is rotatably connected to the fixed shaft.

[0007] The mounting plate is provided with a first protrusion, the second gear is provided with a second protrusion, and a torsion spring is sleeved on the fixed shaft. One end of the torsion spring is fixed on the first protrusion, and the other end is fixed on the second protrusion.

[0008] The stator winding includes a stator frame, and the stator frame has multiple winding tooth bodies, with mounting grooves formed between the winding tooth bodies.

[0009] The stator frame is provided with an upper connecting shell at its upper end, and an upper winding tooth is provided at the upper end of the upper connecting shell. The upper winding tooth is installed above the winding tooth body. The lower end of the upper connecting shell is provided with an upper mounting protrusion, which is inserted into the upper end of the mounting groove.

[0010] The lower end of the stator frame is provided with a lower connecting shell, the lower end of the lower connecting shell is provided with a lower winding tooth, the lower winding tooth is installed below the winding tooth body, and the lower end of the lower connecting shell is provided with a lower mounting protrusion, which is inserted into the lower end of the mounting groove.

[0011] The slot has a boss, and the magnet has a corresponding groove, with the boss inserted into the groove.

[0012] The slot has magnetic bridges at both ends.

[0013] The upper end cover is provided with an upper connecting lug, and the lower end cover is provided with a lower connecting lug. The upper connecting lug and the lower connecting lug are connected by a stud.

[0014] The upper connecting lug, lower connecting lug, and stud are provided in at least 4 sets.

[0015] During assembly, the upper and lower connecting shells are inserted into the mounting grooves on the stator frame via the upper and lower mounting protrusions. The upper winding teeth of the upper connecting shell are mounted above the winding tooth body, and the lower winding teeth of the lower connecting shell are mounted below the winding tooth body. The coil is wound around the stator frame, ensuring the winding is correctly arranged. Then, the rotor assembly is passed through the stator winding, and the upper and lower end covers are installed on the stator winding, ensuring the ball bearing passes through the through hole. At this time, the second gear is driven to rotate, and the second gear drives the first gear. Simultaneously, the shaft pin moves along the arc groove, causing the movable rod to move along the slide groove, so that the clamping block on the movable rod abuts against the ball bearing. Since a torsion spring is connected to the second gear, the torsion spring provides a restoring force, causing the clamping block to press the ball bearing tightly, ensuring the stability of the structure.

[0016] The beneficial effects of this utility model are:

[0017] The clamping mechanism of this utility model, through the cooperation of the movable rod and the slide groove, allows the movable rod to move radially along the slide groove, thereby adapting to ball bearings of different sizes and improving the adaptability of the motor and assembly efficiency.

[0018] This invention features a stable structure, reducing the risk of loosening or misalignment during assembly and improving the overall stability of the motor.

[0019] This invention simplifies the assembly process, reduces operational complexity, and significantly improves production efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is an exploded view of the rotor assembly of this utility model.

[0022] Figure 3 This is a structural schematic diagram of the stator assembly of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the lower end cover of this utility model.

[0024] Figure 5 This is a schematic diagram of the clamping mechanism of this utility model.

[0025] Figure 6 This is a side view of the lower end cover of this utility model.

[0026] Figure 7 This is a schematic diagram of the structure of the lower end cover removal clamping mechanism of this utility model.

[0027] Figure 8 This is a schematic diagram of the stator frame of this utility model.

[0028] Figure 9 This is a schematic diagram of the upper connecting shell of this utility model.

[0029] Figure 10 This is a schematic diagram of the structure of the lower connecting shell of this utility model.

[0030] In the diagram: 1. Stator assembly; 2. Rotor assembly; 3. Shaft; 4. Iron core; 5. Slot; 6. Magnet; 7. Ball bearing; 8. Clamping mechanism; 9. Upper end cover; 10. Lower end cover; 11. First gear; 12. Second gear; 13. Fixing plate; 14. Through hole; 15. Slide groove; 16. Movable rod; 17. Shaft pin; 18. Arc groove; 19. Clamping block; 20. Mounting plate; 21. 21. Fixed shaft; 22. First protrusion; 23. Second protrusion; 24. Torsion spring; 25. Stator frame; 26. Gear body; 27. Mounting groove; 28. Upper connecting shell; 29. ​​Upper gear; 30. Upper mounting protrusion; 31. Lower connecting shell; 32. Lower gear; 33. Lower mounting protrusion; 34. Boss; 35. Groove; 36. Magnetic bridge; 37. Upper connecting lug; 38. Lower connecting lug; 39. Stud. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0032] according to Figures 1 to 10 As shown, this utility model discloses a highly adaptable brushless DC motor, including a stator assembly 1, within which a rotor assembly 2 is provided. The rotor assembly 2 consists of a rotating shaft 3 and an iron core 4 that rotates synchronously with the rotating shaft 3. The iron core 4 has a slot 5, in which a magnet 6 is installed. A ball bearing 7 is also provided on the rotating shaft 3 to reduce rotational friction and improve rotational smoothness. The stator assembly 1 includes a stator winding, with an upper end cover 9 and a lower end cover 10 at the upper and lower ends, respectively. A clamping mechanism 8 is installed inside the lower end cover 10. The clamping mechanism 8 rotates through the meshing connection of a first gear 11 and a second gear 12. The first gear 11 rotates to... A fixing plate 13 is provided above the first gear 11 and placed on the lower end cover 10. The fixing plate 13 is fixed on the lower end cover 10 and has a through hole 14 in its center. The ball bearing 7 passes through the through hole 14. The fixing plate 13 has multiple radially arranged sliding grooves 15. A movable rod 16 is slidably arranged in the sliding grooves 15. The movable rod 16 has a shaft pin 17. The shaft pin 17 passes through the arc groove 18 on the first gear 11. When the first gear 11 rotates, it can drive the shaft pin 17 to move along the arc groove 18, so that the movable rod 16 can be flexibly adjusted. The end of the movable rod 16 has a clamping block 19. The clamping block 19 contacts the ball bearing 7 and provides appropriate clamping force to ensure its stability.

[0033] The lower end cover 10 is provided with a mounting plate 20, and a fixed shaft 21 is provided on the mounting plate 20. The second gear 12 is rotatably connected to the fixed shaft 21. The mounting plate 20 is also provided with a first protrusion 22, and the second gear 12 is correspondingly provided with a second protrusion 23. A torsion spring 24 is sleeved on the fixed shaft 21. One end of the torsion spring 24 is fixed to the first protrusion 22 on the mounting plate 20, and the other end is fixed to the second protrusion 23 on the second gear 12. Through this structure, the torsion spring 24 can apply pressure to the gear and increase the clamping force of the movable rod 16 on the ball bearing 7.

[0034] The stator winding includes a stator frame 25, within which multiple winding tooth bodies 26 are provided. These winding tooth bodies 26 form mounting grooves 27 to facilitate the assembly and fixation of the stator winding. An upper connecting shell 28 is provided at the upper end of the stator frame 25, and upper winding teeth 29 are provided at the upper end of the upper connecting shell 28. The upper winding teeth 29 are mounted above the winding tooth bodies 26. An upper mounting protrusion 30 is provided at the lower end of the upper connecting shell 28, which is inserted into the upper end of the mounting groove 27, effectively preventing displacement or loosening between components and ensuring stable motor operation. A lower connecting shell 31 is provided at the lower end of the stator frame 25, and lower winding teeth 32 are provided at the lower end of the lower connecting shell 31, which is mounted below the winding tooth bodies 26. A lower mounting protrusion 33 is provided at the lower end of the lower connecting shell 31, which is inserted into the lower end of the mounting groove 27, ensuring a stable connection between the stator frame 25 and the upper connecting shell 28 and the lower connecting shell 31.

[0035] The slot 5 has a boss 34 and a corresponding groove 35 on the magnet 6. The insertion and engagement between the boss 34 and the groove 35 can effectively fix the magnet 6, ensuring that it will not be displaced or loosened during motor operation, maintaining the stability of the magnetic field and the high efficiency of the motor. The slot 5 has magnetic bridges 36 at both ends. The function of these magnetic bridges 36 is to strengthen the closure of the magnetic field, optimize the flow of magnetic flux, further improve the magnetic effect of the motor, and thus improve the output power and efficiency of the motor.

[0036] In addition, the upper end cover 9 is provided with an upper connecting ear 37, and the lower end cover 10 is provided with a lower connecting ear 38. The upper connecting ear 37 and the lower connecting ear 38 are connected by a stud 39. This connection method provides a stable structural support. The number of upper connecting ears 37, lower connecting ears 38 and studs 39 is at least 4 sets, which ensures the firmness of the connection.

[0037] During assembly, the upper connecting shell 28 and the lower connecting shell 31 are inserted into the mounting groove 27 on the stator frame 25 via the upper mounting protrusion 30 and the lower mounting protrusion 33. The upper winding tooth 29 of the upper connecting shell 28 is mounted above the winding tooth body 26, and the lower winding tooth 32 of the lower connecting shell 31 is mounted below the winding tooth body 26. The coil is wound on the stator frame 25 to ensure the winding is correctly arranged. Then, the rotor assembly 2 is passed through the stator winding, and the upper end cover 9 and the lower end cover 10 are installed on the stator winding, ensuring that the ball bearing 7 passes through the through hole 14. At this time, the second gear 12 is driven to rotate, and the second gear 12 drives the first gear 11. At the same time, the shaft pin 17 moves along the arc groove 18, causing the movable rod 16 to move along the slide groove 15, so that the clamping block 19 on the movable rod 16 abuts against the ball bearing 7. Since the second gear 12 is connected to the torsion spring 24, the torsion spring 24 provides a restoring force, so that the clamping block 19 presses the ball bearing 7, ensuring its structural stability.

[0038] The beneficial effects of this utility model are:

[0039] The clamping mechanism of this utility model, through the cooperation of the movable rod and the slide groove, allows the movable rod to move radially along the slide groove, thereby adapting to ball bearings of different sizes and improving the adaptability of the motor and assembly efficiency.

[0040] This invention features a stable structure, reducing the risk of loosening or misalignment during assembly and improving the overall stability of the motor.

[0041] This invention simplifies the assembly process, reduces operational complexity, and significantly improves production efficiency.

[0042] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A brushless DC motor, comprising a stator assembly, wherein a rotor assembly is disposed within the stator assembly, characterized in that: The rotor assembly includes a shaft with an iron core that rotates synchronously with it. The iron core has a slot containing a magnet. The shaft also has a ball bearing. The stator assembly includes a stator winding with an upper end cover and a lower end cover. The lower end cover contains a clamping mechanism, including a first gear rotatably mounted on the lower end cover, meshing with a second gear. A fixing plate is located above the first gear and fixed to the lower end cover. The fixing plate has a through hole at its center, through which the ball bearing passes. The fixing plate has multiple sliding grooves radially arranged along its center. A movable rod slides within each groove, with a pin on the rod. The first gear has an arc-shaped groove, through which the pin passes. A clamping block abuts against the ball bearing at the end of the movable rod.

2. The brushless DC motor according to claim 1, characterized in that: The lower end cover is provided with a mounting plate, and the mounting plate is provided with a fixed shaft, and the second gear is rotatably connected to the fixed shaft.

3. A brushless DC motor according to claim 2, characterized in that: The mounting plate is provided with a first protrusion, the second gear is provided with a second protrusion, and a torsion spring is sleeved on the fixed shaft. One end of the torsion spring is fixed on the first protrusion, and the other end is fixed on the second protrusion.

4. A brushless DC motor according to claim 1, characterized in that: The stator winding includes a stator frame, and the stator frame has multiple winding tooth bodies, with mounting grooves formed between the winding tooth bodies.

5. A brushless DC motor according to claim 4, characterized in that: The stator frame is provided with an upper connecting shell at its upper end, and an upper winding tooth is provided at the upper end of the upper connecting shell. The upper winding tooth is installed above the winding tooth body. The lower end of the upper connecting shell is provided with an upper mounting protrusion, which is inserted into the upper end of the mounting groove.

6. A brushless DC motor according to claim 4, characterized in that: The lower end of the stator frame is provided with a lower connecting shell, the lower end of the lower connecting shell is provided with a lower winding tooth, the lower winding tooth is installed below the winding tooth body, and the lower end of the lower connecting shell is provided with a lower mounting protrusion, which is inserted into the lower end of the mounting groove.

7. A brushless DC motor according to claim 1, characterized in that: The slot has a boss, and the magnet has a corresponding groove, with the boss inserted into the groove.

8. A brushless DC motor according to claim 1, characterized in that: The slot has magnetic bridges at both ends.

9. A brushless DC motor according to claim 1, characterized in that: The upper end cover is provided with an upper connecting lug, and the lower end cover is provided with a lower connecting lug. The upper connecting lug and the lower connecting lug are connected by a stud.

10. A brushless DC motor according to claim 9, characterized in that: The upper connecting lug, lower connecting lug, and stud are provided in at least 4 sets.

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