Hollow cup brushless motor for manicure polishing tool

Abstract

The utility model discloses a coreless brushless motor for a nail polishing tool, which comprises a casing, a front cover and a rear cover, a rotor assembly and a stator assembly are arranged in the casing, the rotor assembly is arranged in the stator assembly in a penetrating manner, and the stator assembly comprises a stator iron core and a three-section coil winding. The three coil windings are arranged in the stator core in a penetrating mode and tightly attached to the inner side wall of the stator core, the central angle of each coil winding is 120 degrees, circumferential symmetry is formed, a single-layer or double-layer varnished wire centralized winding is embedded in each coil winding, varnished wires are spirally wound in the radial direction of a wire cup, and the phase difference between every two adjacent coil windings is 120 degrees. A heat dissipation groove is formed in the bottom of each coil winding, and the end part of each coil winding is arc-shaped. The heat dissipation area is increased through the three-petal symmetrical design, and the temperature rise is reduced through the heat dissipation grooves; vibration noise is low, magnetic field distribution is uniform, and torque pulsation is reduced; miniaturization: the concentrated winding saves space, and meets the requirement for miniaturization of manicure tools; manufacturing is convenient, and automatic winding is facilitated through the modular wire cup structure.

Description

Technical Field

[0001] This utility model relates to a hollow cup brushless motor, and more particularly to a hollow cup brushless motor for nail polishing tools. Background Technology

[0002] Traditional brushless motors for nail art often use a single-coil or symmetrical double-coil structure. During winding, uneven wire accumulation can easily occur, leading to speed fluctuations, low efficiency, and poor heat dissipation at high speeds, which shortens the motor's lifespan. Specifically, the following problems exist.

[0003] 1. Low efficiency: Traditional winding design results in high eddy current losses, high temperature, and reduced tool life;

[0004] 2. Size limitations: Nail tools require miniaturized motors, and conventional windings cannot balance power density and heat dissipation; 3. Vibration and noise: Uneven magnetic field distribution causes operating vibration, affecting user experience. Summary of the Invention

[0005] To overcome the shortcomings and deficiencies of existing technologies, the purpose of this invention is to provide a hollow cup brushless motor for nail polishing tools. This invention improves winding efficiency, reduces energy consumption and noise, and optimizes heat dissipation through a three-lobed coil winding structure.

[0006] The purpose of this utility model is achieved through the following technical solution: a hollow cup brushless motor for nail polishing tools, comprising a housing, a front cover, and a rear cover. The housing contains a rotor assembly and a stator assembly, with the rotor assembly passing through the stator assembly. The front cover has a front insertion end and a connecting end. The side of the front insertion end has a front fixing protrusion, and the side of the connecting end has a mating groove. The rear cover has a rear insertion end and a PCB mounting end. The side of the rear insertion end has a rear fixing protrusion. The front insertion end is inserted into one end of the housing and fixed by the front fixing protrusion, and the rear insertion end is inserted into the other end of the housing and fixed by the rear fixing protrusion.

[0007] The stator assembly includes a stator core and a three-lobed coil winding. The three-lobed coil winding passes through the stator core and is tightly attached to the inner wall of the stator core. It adopts a symmetrically distributed three-lobed spool structure, with each spool having a central angle of 120°, forming circumferential symmetry. Each coil winding contains a single or double layer of concentrated winding, with the conductor spirally wound radially along the spool. The phase difference between adjacent spool windings is 120°. Heat dissipation grooves are provided at the bottom of the coil winding, and the ends of the coil winding adopt an arc-shaped transition to reduce leakage flux and eddy current losses.

[0008] As an improvement of the hollow cup brushless motor for nail polishing tools of this utility model, the three-lobed coil windings are a first coil winding, a second coil winding, and a third coil winding. One end of the first coil winding is stacked on the inner side of the second coil winding, and the other end is stacked on the outer side of the third coil winding. The other end of the second coil winding is stacked on the inner side of one end of the third coil winding. The first coil winding, the second coil winding, and the third coil winding are arranged in a cylindrical shape.

[0009] As an improvement of the hollow cup brushless motor for nail polishing tools of this utility model, the stator assembly includes a rotating shaft, a magnet, a left balance block and a right balance block. The magnet, the left balance block and the right balance block are all mounted on the rotating shaft. The magnet is located between the left balance block and the right balance block, and one end of the left balance block and the right balance block is in close contact with the end of the magnet.

[0010] As an improvement of the hollow cup brushless motor for nail polishing tools of this utility model, the front cover has a front bearing mounting groove in the middle, the bottom of the front bearing mounting groove has a shaft through hole, and the bearing mounting groove contains a front bearing. The rear plug end has a rear bearing mounting groove in the middle, and the rear bearing mounting groove contains a rear bearing. One end of the rotating shaft is connected to the rear bearing, the other end passes through the front bearing and extends out from the shaft through hole, and the end of the rotating shaft extending out of the shaft through hole has a cross joint.

[0011] As an improvement of the hollow cup brushless motor for nail polishing tools of this utility model, a front sealing ring mounting groove is provided on the side wall of the front bearing mounting groove, a front sealing ring is provided in the front sealing ring mounting groove, and the front sealing ring is in contact with the surface of the front bearing.

[0012] The rear bearing mounting groove has a rear seal ring mounting groove on its side wall, and a rear seal ring is provided in the rear seal ring mounting groove. The rear seal ring is in contact with the surface of the rear bearing.

[0013] As an improvement to the hollow cup brushless motor for nail polishing tools of this utility model, it also includes a spring, which is sleeved on the rotating shaft, with one end of the spring abutting against the front bearing and the other end abutting against the right balance block.

[0014] As an improvement of the hollow cup brushless motor for nail polishing tools of this utility model, a positioning step is provided on the inner side wall of the cavity of the housing, and the stator core abuts against the positioning step.

[0015] As an improvement of the hollow cup brushless motor for nail polishing tools of this utility model, the inner sidewalls of the front and rear ends of the housing are provided with limiting slots. The limiting slot on the inner sidewall of the front end of the housing cooperates with the front fixing protrusion, and the limiting slot on the inner sidewall of the rear end of the housing cooperates with the rear fixing protrusion.

[0016] As an improvement of the hollow cup brushless motor for nail polishing tools of this utility model, the PCB mounting end is provided with a PCB mounting groove, the PCB mounting groove is provided with a PCB positioning step and a PCB board, the PCB positioning step is provided with a positioning protrusion, the PCB board is fixed on the positioning protrusion by screws, the connecting wires of the three-lobed coil winding are all connected to the PCB board, and the lead wires of the PCB board pass out from the back cover.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. High-efficiency heat dissipation: The three-lobed symmetrical design increases the heat dissipation area, and the heat sink reduces the temperature rise;

[0019] 2. Low vibration and noise: Uniform magnetic field distribution reduces torque pulsation;

[0020] 3. Miniaturization: Concentrated windings save space and meet the miniaturization needs of nail tools;

[0021] 4. Easy to manufacture: The modular spool structure facilitates automated winding. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-lobed coil winding structure of this utility model;

[0024] Figure 3 This is a sectional view of the front cover of this utility model;

[0025] Figure 4 This is a sectional view of the rear cover of this utility model;

[0026] The attached diagram is labeled as follows: 1. Housing; 2. Front cover; 3. Rear cover; 4. Rotor assembly; 5. Stator assembly; 6. Cross joint; 7. Spring; 8. Positioning step; 9. Limiting slot; 21. Front insertion end; 22. Connecting end; 23. Front fixing protrusion; 24. Mud docking groove; 25. Front bearing mounting groove; 26. Shaft through hole; 27. Front bearing; 28. Front seal ring mounting groove; 29. ​​Front seal ring; 31. Rear insertion end; 32. PCB mounting end; 33. 34. Rear fixed protrusion; 35. Rear bearing mounting groove; 36. Rear bearing; 37. Rear seal ring mounting groove; 38. Rear seal ring; 39. PCB mounting groove; 30. PCB positioning step; 31. PCB board; 301. Positioning protrusion; 41. Rotating shaft; 42. Magnet; 43. Left balance block; 44. Right balance block; 51. Stator core; 52. Three-lobed coil winding; 521. First coil winding; 522. Second coil winding; 523. Third coil winding. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] like Figures 1-4As shown, a hollow cup brushless motor for nail polishing tools includes a housing 1, a front cover 2, and a rear cover 3. The housing 1 contains a rotor assembly 4 and a stator assembly 5, with the rotor assembly 4 passing through the stator assembly 5. The front cover 2 has a front insertion end 21 and a connecting end 22. The side of the front insertion end 21 has a front fixing protrusion 23, and the side of the connecting end 22 has a mating groove 24. The connecting end 22 mates with the device, and the mating groove 24 is snapped and fixed with the device. The rear cover 3 has a rear insertion end 31 and a PCB mounting end 32. The side of the rear insertion end 31 has a rear fixing protrusion 33. The front insertion end 21 is inserted into one end of the housing and fixed by the front fixing protrusion 23, and the rear insertion end 31 is inserted into the other end of the housing 1 and fixed by the rear fixing protrusion 33.

[0031] The stator assembly 5 includes a stator core 51 and a three-lobed coil winding 52. The three-lobed coil winding 52 passes through the stator core 51 and is in close contact with the inner wall of the stator core 51. It adopts a three-lobed symmetrical spool structure, with the central angle of each spool being 120°, forming circumferential symmetry. Each coil winding has a single or double layer of concentrated winding embedded in it. The conductor is spirally wound along the radial direction of the spool. The phase difference between adjacent spool windings is 120°. A heat dissipation groove is opened at the bottom of the coil winding, and the ends of the coil winding adopt an arc transition to reduce leakage flux and eddy current losses.

[0032] Preferably, the three coil windings 52 are a first coil winding 521, a second coil winding 522, and a third coil winding 523. One end of the first coil winding 521 is stacked on the inner side of the second coil winding 522, and the other end is stacked on the outer side of the third coil winding 523. The other end of the second coil winding 522 is stacked on the inner side of one end of the third coil winding 523. The first coil winding 521, the second coil winding 522, and the third coil winding 523 are arranged in a cylindrical shape.

[0033] Preferably, the stator assembly 4 includes a rotating shaft 41, a magnet 42, a left balance block 43 and a right balance block 44. The magnet 42, the left balance block 43 and the right balance block 44 are all mounted on the rotating shaft 41. The magnet 42 is located between the left balance block 43 and the right balance block 44, and one end of the left balance block 43 and the right balance block 44 is in close contact with the end of the magnet 42.

[0034] Preferably, the front cover 2 has a front bearing mounting groove 25 in the middle, a shaft through hole 26 at the bottom of the front bearing mounting groove 25, a front bearing 27 in the bearing mounting groove 25, a rear bearing mounting groove 34 in the middle of the rear plug end 31, a rear bearing 35 in the rear bearing mounting groove 34, one end of the rotating shaft 41 is connected to the rear bearing 35, the other end passes through the front bearing 27 and extends out from the shaft through hole 26, and a cross joint 6 is provided at the end of the rotating shaft 41 that extends out of the shaft through hole 26.

[0035] Preferably, a front seal ring mounting groove 28 is provided on the side wall of the front bearing mounting groove 25, and a front seal ring 29 is provided in the front seal ring mounting groove 28, with the front seal ring 29 in contact with the surface of the front bearing 27.

[0036] The rear bearing mounting groove 34 has a rear seal ring mounting groove 36 on its side wall, and a rear seal ring 37 is provided in the rear seal ring mounting groove 36. The rear seal ring 37 is in contact with the surface of the rear bearing 35.

[0037] Preferably, it also includes a spring 7, which is sleeved on the rotating shaft 41, with one end of the spring 7 abutting against the front bearing 27 and the other end abutting against the right balance block 44.

[0038] Preferably, the inner wall of the cavity of the housing 1 is provided with a positioning step 8, and the stator core 51 abuts against the positioning step 8.

[0039] Preferably, the inner sidewalls of the front and rear ends of the housing 1 are provided with limiting slots 9. The limiting slots 9 on the inner sidewalls of the front end of the housing 1 cooperate with the front fixing protrusion 23, and the limiting slots 9 on the inner sidewalls of the rear end of the housing 1 cooperate with the rear fixing protrusion 33.

[0040] Preferably, the PCB mounting end 32 is provided with a PCB mounting groove 38, the PCB mounting groove 38 is provided with a PCB positioning step 39 and a PCB board 30, the PCB positioning step 39 is provided with a positioning protrusion 301, the PCB board 30 is fixed to the positioning protrusion 301 by screws, the connecting wires of the three-lobed coil winding 52 are all connected to the PCB board 30, and the leads of the PCB board 30 pass out from the rear cover 3.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and structure of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hollow cup brushless motor for nail polishing tools, characterized in that, The device includes a housing, a front cover, and a rear cover. The housing houses a rotor assembly and a stator assembly, with the rotor assembly passing through the stator assembly. The front cover has a front insertion end and a connecting end. The side of the front insertion end has a front fixing protrusion, and the side of the connecting end has a mating groove. The rear cover has a rear insertion end and a PCB mounting end. The side of the rear insertion end has a rear fixing protrusion. The front insertion end is inserted into one end of the housing and fixed by the front fixing protrusion, and the rear insertion end is inserted into the other end of the housing and fixed by the rear fixing protrusion. The stator assembly includes a stator core and a three-lobed coil winding. The three-lobed coil winding passes through the stator core and is in close contact with the inner wall of the stator core. The central angle of each coil winding is 120°, forming circumferential symmetry. Each coil winding has a single or double layer of enameled wire concentrated winding embedded in it. The enameled wire is spirally wound radially along the spool. The phase difference between adjacent coil windings is 120°. A heat dissipation groove is opened at the bottom of each coil winding, and the end of each coil winding is arc-shaped.

2. The hollow cup brushless motor for nail polishing tools according to claim 1, characterized in that, The three coil windings are a first coil winding, a second coil winding, and a third coil winding. One end of the first coil winding is stacked on the inner side of the second coil winding, and the other end is stacked on the outer side of the third coil winding. The other end of the second coil winding is stacked on the inner side of one end of the third coil winding. The first coil winding, the second coil winding, and the third coil winding are arranged in a cylindrical shape.

3. The hollow cup brushless motor for nail polishing tools according to claim 1, characterized in that, The stator assembly includes a rotating shaft, a magnet, a left balance block, and a right balance block. The magnet, the left balance block, and the right balance block are all mounted on the rotating shaft. The magnet is located between the left balance block and the right balance block, and one end of the left balance block and the right balance block is in close contact with the end of the magnet.

4. The hollow cup brushless motor for nail polishing tools according to claim 3, characterized in that, The front cover has a front bearing mounting groove in the middle, and a shaft through hole at the bottom of the front bearing mounting groove. The front bearing is installed in the bearing mounting groove. The rear plug end has a rear bearing mounting groove in the middle, and a rear bearing is installed in the rear bearing mounting groove. One end of the rotating shaft is connected to the rear bearing, and the other end passes through the front bearing and extends out from the shaft through hole. The end of the rotating shaft extending out of the shaft through hole is provided with a cross joint.

5. The hollow cup brushless motor for nail polishing tools according to claim 4, characterized in that, The front bearing mounting groove has a front seal ring mounting groove on its side wall, and a front seal ring is provided in the front seal ring mounting groove. The front seal ring is in contact with the surface of the front bearing. The rear bearing mounting groove has a rear seal ring mounting groove on its side wall, and a rear seal ring is provided in the rear seal ring mounting groove. The rear seal ring is in contact with the surface of the rear bearing.

6. The hollow cup brushless motor for nail polishing tools according to claim 4, characterized in that, It also includes a spring, which is sleeved on the rotating shaft, with one end of the spring abutting against the front bearing and the other end abutting against the right balance block.

7. The hollow cup brushless motor for nail polishing tools according to claim 1, characterized in that, The inner wall of the cavity of the housing is provided with a positioning step, and the stator core abuts against the positioning step.

8. The hollow cup brushless motor for nail polishing tools according to claim 1, characterized in that, The front and rear inner walls of the housing are provided with limiting slots. The limiting slot on the front inner wall of the housing cooperates with the front fixing protrusion, and the limiting slot on the rear inner wall of the housing cooperates with the rear fixing protrusion.

9. The hollow cup brushless motor for nail polishing tools according to claim 1, characterized in that, The PCB mounting end is provided with a PCB mounting groove, and the PCB mounting groove is provided with a PCB positioning step and a PCB board. The PCB positioning step is provided with a positioning protrusion, and the PCB board is fixed to the positioning protrusion by screws. The connecting wires of the three-lobed coil winding are all connected to the PCB board, and the leads of the PCB board pass out from the back cover.

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