Brushless electric toothbrush motor

Abstract

The utility model relates to a brushless electric toothbrush motor, which comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator iron core, a coil holder and a Hall circuit board, the stator iron core is connected with the Hall circuit board through the coil holder, the rotor assembly comprises a small magnet and a central shaft penetrating through the stator assembly, and the small magnet is connected with the Hall circuit board through the coil holder. The brushless electric toothbrush motor comprises a central shaft and a Hall circuit board, the central shaft is provided with a plurality of small magnets, the small magnets are coaxially connected with the central shaft in an inserted mode, the Hall circuit board is provided with a plurality of Hall elements distributed at included angles, and the Hall elements are located above the small magnets, based on the operation, the precision and reliability of the motor can be enhanced, large-amplitude sweeping vibration of the motor is achieved, and the service life of the motor is prolonged. According to the brushless electric toothbrush, the requirements of the Bass tooth brushing method are met, the use experience of a user is improved, meanwhile, the stability of the motor in the operation process is guaranteed, the quality of the brushless electric toothbrush is improved, and the service life of the electric toothbrush is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, and more specifically, the utility model relates to a brushless electric toothbrush motor. Background Art

[0002] With the gradual enhancement of the national oral health awareness, electric toothbrushes are more and more widely used in the oral cleaning process. At present, the electric toothbrushes on the market are mainly divided into brushed electric toothbrushes and brushless electric toothbrushes. Compared with brushed electric toothbrushes, brushless electric toothbrushes have lower noise and vibration sense, and longer service life. This is mainly because the brushless electric toothbrush removes the carbon brush, so the noise and vibration generated by friction are reduced, and the wear and failure points are also reduced, and the service life is longer. This makes the brushless electric toothbrush quieter and more comfortable to use, improving the user's toothbrushing experience.

[0003] At present, in order to ensure the stability of the electric toothbrush during use, a limiting method is generally used to enhance the stability during the vibration of the motor. Since the motor can only vibrate within the range of the limiting structure, the swing amplitude of the motor is limited, and the large swing amplitude toothbrushing of the Bass method cannot be realized, which greatly affects the user experience and hinders the forward development of the electric toothbrush market. If the swing amplitude of the motor is increased, it is extremely easy for parts such as magnets and circuit boards to become loose or fall off during the use of the electric toothbrush due to insecure fixation, thus affecting the stability of the operation process of the electric toothbrush and being not conducive to the normal use of the electric toothbrush. Summary of the Utility Model

[0004] In order to solve the problems of the above-mentioned prior art, the utility model provides a brushless electric toothbrush motor. The Hall elements angularly distributed on the Hall circuit board are located above the small magnet, so that the Hall elements can accurately control the rotation angle and swing amplitude of the motor by detecting the magnetic field change of the small magnet. At the same time, the small magnet, the magnetic steel sheet and the Hall circuit board are all fixed in position by a limiting method, enhancing the stability of the operation of the electric toothbrush.

[0005] According to one aspect of the utility model, a brushless electric toothbrush motor is provided, including a stator assembly and a rotor assembly. The stator assembly includes a stator core, a wire holder and a Hall circuit board. The stator core is connected to the Hall circuit board through the wire holder. The rotor assembly includes a small magnet and a central shaft passing through the stator assembly. The small magnet is coaxially inserted into the central shaft. A plurality of Hall elements angularly distributed are installed on the Hall circuit board, and the Hall elements are located above the small magnet.

[0006] Through this solution, the plurality of Hall elements located above the small magnet are angularly arranged, which can accurately control the swing amplitude of the motor and improve the accuracy and reliability of the motor operation.

[0007] Preferably, the included angle between the Hall elements is 60°.

[0008] With this solution, the included angle between the Hall elements is set to 60°, which can cover a wider range of magnetic field changes, contribute to improving the accuracy of magnetic field detection, and at the same time improve the control accuracy and stability of the motor, reduce the swing amplitude of the motor, and is conducive to implementing the Bass brushing method.

[0009] Preferably, the rotor assembly further includes a copper sleeve inserted into the central axis, and the copper sleeve is inserted into the small magnet through a positioning member.

[0010] With this solution, the setting of the positioning member can effectively limit the position of the small magnet to prevent the small magnet from loosening during the operation of the motor, improving the quality and lifespan of the product.

[0011] Preferably, the positioning member includes a positioning groove and a positioning post. The positioning groove is formed on the inner ring of the small magnet, the positioning post is fixedly installed on the periphery of the copper sleeve, and the positioning post is inserted into the positioning groove in a matching manner.

[0012] With this solution, the positioning groove on the small magnet is aligned with the positioning post on the copper sleeve and inserted, which not only facilitates the installation of the small magnet and plays a good positioning role, but also can limit the position of the small magnet during the operation of the motor to prevent the position of the small magnet from loosening, ensuring the stability during the operation of the electric toothbrush.

[0013] Preferably, the positioning groove is an arc-shaped structure.

[0014] With this solution, the setting of the arc-shaped structure enhances the smoothness of the small magnet inserted into the copper sleeve without affecting the limitation of the small magnet, making it more convenient to install the small magnet.

[0015] Preferably, the rotor assembly further includes a rotor core, magnetic steel sheets, and copper sheets. The rotor core and the copper sheets are both inserted into the central axis, the copper sheet presses against the small magnet, the rotor core is circumferentially provided with a plurality of grooves, and the magnetic steel sheets are inserted into the grooves in a matching manner.

[0016] With this solution, the magnetic steel sheets are inserted into the grooves on the outer side of the rotor core, enhancing the stability of the magnetic steel sheets during operation and extending the service life of the electric toothbrush; the copper sheet presses against the small magnet, limiting the position of the small magnet between the copper sheet and the copper sleeve, further realizing the limitation of the position of the small magnet, enhancing the stability of the installation of the small magnet, and preventing the small magnet from loosening during the operation of the motor.

[0017] Preferably, the groove includes an inner groove and an outer groove. The outer groove is arranged outside the inner groove. The width of the inner side of the transverse section of the inner groove is smaller than that of the outer side, and the width of the inner side of the transverse section of the outer groove is larger than that of the outer side.

[0018] With this solution, the inner groove and the outer groove together form the groove on the rotor core. The inner groove gradually expands from the center of the rotor core outwards, and the outer groove gradually tightens inwards on the basis of the expansion outside the inner groove. This better ensures that the magnetic steel sheet can always be inserted into the rotor core during the operation of the motor, enhances the stability during the use of the electric toothbrush, and improves the quality and service life of the electric toothbrush.

[0019] Preferably, the wire holder is inserted and installed inside the stator core. The rotor core and the magnetic steel sheet are arranged inside the wire holder. The wire holder includes an upper wire holder and a lower wire holder. The upper wire holder is located above the lower wire holder. A limiting boss is arranged on the upper wire holder, and the limiting boss is adaptively inserted into the limiting groove on the Hall circuit board.

[0020] With this solution, limiting bosses are vertically and fixedly installed on both sides of the upper wire holder. The limiting bosses are adaptively inserted into the limiting grooves opened on both sides of the Hall circuit board, which can better limit the position of the Hall circuit board, prevent the Hall circuit board from detaching from the upper wire holder during the movement of the motor, and ensure the stability of the operation of the electric toothbrush.

[0021] The technical effect of the present utility model is that this brushless electric toothbrush motor can not only enhance the accuracy and reliability of the motor, achieve a large-scale sweep and vibration of the motor, meet the requirements of the Bass brushing method, improve the user experience, but also limit the positions of the small magnet, the magnetic steel sheet and the Hall circuit board, ensure the stability during the operation of the motor, improve the quality of the brushless electric toothbrush, and extend the service life of the electric toothbrush.

[0022] Through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings, other features and advantages of the present utility model will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an exploded structural schematic diagram of the brushless electric toothbrush motor in this embodiment.

[0024] Figure 2 is a structural schematic diagram of the stator assembly and the rotor assembly in this embodiment.

[0025] Figure 3 is an exploded structural schematic diagram of the stator assembly in this embodiment.

[0026] Figure 4It is an exploded structural schematic diagram of the rotor assembly in this embodiment.

[0027] Figure 5 It is a structural schematic diagram of the Hall element and the limiting groove in this embodiment.

[0028] Figure 6 It is a structural schematic diagram of the positioning component in this embodiment.

[0029] Figure 7 It is a structural schematic diagram of the groove on the rotor core in this embodiment.

[0030] Figure 8 It is a structural schematic diagram of the limiting boss in this embodiment.

[0031] Markings in the figure: 1. Stator assembly: 11. Stator core, 12. Wire frame: 121. Upper wire frame, 122. Lower wire frame, 13. Hall circuit board; 2. Rotor assembly: 21. Small magnet, 22. Central shaft, 23. Copper sleeve: 231. Upper copper sleeve, 232. Lower copper sleeve, 24. Rotor core, 25. Magnetic steel sheet, 26. Copper sheet; 3. Hall element; 4. Positioning component: 41. Positioning groove, 42. Positioning post; 5. Groove: 51. Inner groove, 52. Outer groove; 6. Limiting boss; 7. Limiting groove; 8. First bearing; 9. Machine housing; 10. Second bearing; 101. Rear cover. Detailed implementation manners

[0032] The following further illustrates the present utility model in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present utility model. The methods used in the present utility model are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0033] Embodiment

[0034] As Figures 1 to 8 shown, the brushless electric toothbrush motor in this embodiment includes a stator assembly 1 and a rotor assembly 2. The stator assembly 1 includes a stator core 11, a wire frame 12, and a Hall circuit board 13. The stator core 11 is connected to the Hall circuit board 13 through the wire frame 12. Coils are wound on the wire frame 12, and both ends of the coils are connected to the Hall circuit board 13. The rotor assembly 2 includes a small magnet 21 and a central shaft 22 passing through the stator assembly 1. The small magnet 21 uses a circular radially magnetized magnetic steel sheet, and the magnetic pole of this magnetic steel sheet is 2 poles. The small magnet 21 is coaxially inserted into the central shaft 22. A plurality of Hall elements 3 distributed at an angle are installed on the Hall circuit board 13. The Hall elements 3 are located above the small magnet 21 and can accurately control the swing amplitude of the motor, improving the accuracy and reliability of the motor operation. Specifically, the number of the Hall elements 3 in this embodiment is two.

[0035] Further, the included angle between the Hall elements 3 is 60°, which can cover a wider magnetic field change range, help improve the accuracy of magnetic field detection, and at the same time improve the control accuracy and stability of the motor, increase the swing amplitude of the motor, and is beneficial to realizing the Bass brushing method.

[0036] Further, the rotor assembly 2 further includes a copper sleeve 23 inserted into the central shaft 22. The copper sleeve includes an upper copper sleeve 231 and a lower copper sleeve 232. The upper copper sleeve is coaxially and fixedly installed at the top of the lower copper sleeve 232. The diameter of the upper copper sleeve 231 is smaller than that of the lower copper sleeve 232. The copper sleeve 23 is inserted into the small magnet 21 through a positioning member 4.

[0037] The setting of the positioning member 4 can effectively limit the position of the small magnet 21 to prevent the small magnet 21 from loosening during the operation of the motor, and improve the quality and lifespan of the product.

[0038] Further, the positioning member 4 includes a positioning groove 41 and a positioning post 42. The positioning groove 41 is formed on the inner ring of the small magnet 21. The positioning post 42 is fixedly installed on the periphery of the copper sleeve 23. The positioning post 42 is inserted into the positioning groove 41 in a matching manner. Specifically, two positioning grooves 41 are formed on the small magnet 21, and the positioning grooves 41 are arranged in a straight line. The positioning post 42 corresponding to the positioning groove 41 is fixedly installed on the copper sleeve 23. The positioning post 42 is fixedly installed on the outer side of the upper copper sleeve 231, and the diameter of the circle where the positioning post 42 is located is the same as that of the lower copper sleeve 232.

[0039] The positioning groove 41 on the small magnet 21 is aligned with the positioning post 42 on the upper copper sleeve 231 and inserted, which not only facilitates the installation of the small magnet 21 and plays a good positioning role, but also can limit the position of the small magnet 21 during the operation of the motor to prevent the position of the small magnet 21 from loosening, and ensure the stability during the operation of the electric toothbrush.

[0040] Further, the positioning groove 41 is an arc-shaped structure, which can enhance the smoothness of the insertion of the small magnet 21 into the copper sleeve 23 without affecting the limitation of the small magnet 21, and is more convenient for the installation of the small magnet 21.

[0041] Further, the rotor assembly 2 further includes a rotor core 24, magnet sheets 25, and copper sheets 26. Both the rotor core 24 and the copper sheets 26 are inserted into the central shaft 22. The copper sheets 26 are pressed against the small magnets 21, limiting the positions of the small magnets 21 between the copper sheets 26 and the copper sleeves 23, further realizing the limitation of the positions of the small magnets 21, enhancing the stability of the installation of the small magnets 21, and preventing the small magnets 21 from loosening during the operation of the motor. A plurality of grooves 5 are circumferentially arranged on the rotor core 24, and the magnet sheets 25 are inserted into the grooves 5 in a matching manner, enhancing the stability of the magnet sheets 25 during operation and extending the service life of the electric toothbrush. Specifically, the number of grooves 5 and magnet sheets 25 in this embodiment is four each.

[0042] Further, the groove 5 includes an inner groove 51 and an outer groove 52. The dotted lines in this embodiment are only for distinguishing the inner groove 51 and the outer groove 52 and have no other meaning. The outer groove 52 is arranged outside the inner groove 51. The width of the inner side of the transverse section of the inner groove 51 is smaller than that of the outer side, and the width of the inner side of the transverse section of the outer groove 52 is larger than that of the outer side.

[0043] The inner groove 51 and the outer groove 52 together form the groove 5 on the rotor core 24. The inner groove 51 gradually expands from the center of the rotor core 24 to the outside, and the outer groove 52 gradually tightens inward on the basis of the expansion outside the inner groove 51. In this way, it better ensures that the magnet sheets 25 can always be inserted into the rotor core 24 during the operation of the motor, enhancing the stability during the use of the electric toothbrush and improving the quality and service life of the electric toothbrush.

[0044] Further, the wire frame 12 is inserted and installed inside the stator core 11. The rotor core 24 and the magnet sheets 25 are arranged inside the wire frame 12. The wire frame 12 includes an upper wire frame 121 and a lower wire frame 122. The upper wire frame 121 is located above the lower wire frame 122. A limiting boss 6 is arranged on the upper wire frame 121, and the limiting boss 6 is inserted into the limiting groove 7 on the Hall circuit board 13 in a matching manner. The vertical cross-section of the inserted part of the limiting boss 6 and the limiting groove 7 is rectangular.

[0045] The limiting bosses 6 are vertically and fixedly installed on both sides of the upper wire frame 121. The limiting bosses 6 extend to both sides of the Hall circuit board 13 and are inserted into the limiting grooves 7 opened thereon, which can better limit the position of the Hall circuit board 13 and prevent the Hall circuit board 13 from detaching from the upper wire frame 121 during the movement of the motor, ensuring the stability of the operation of the electric toothbrush.

[0046] Further, one end of the central shaft 22 is rotatably connected to the machine housing 9 through a first bearing 8, and the other end is rotatably connected to the rear cover 101 through a second bearing 10. The machine housing 9 is fixedly connected to the rear cover 101. Specifically, the first bearing 8 is an MR84ZZ bearing, and the second bearing 10 is an MR83ZZ bearing.

[0047] The working principle of this embodiment is as follows:

[0048] A first bearing 8 is fixedly installed on the central shaft 22. A rotor core 24 is fixedly sleeved on the central shaft 22 on one side of the first bearing 8. A magnet steel sheet 25 is clamped in the groove 5 of the rotor core 24. An upper wire frame 121 and a lower wire frame 122 are sleeved around the magnet steel sheet 25. The upper wire frame 121 and the lower wire frame 122 are both inserted into the stator core 11. The stator core 11 is fixedly installed inside the machine housing 9. A copper sleeve 23 is pressed onto the top end of the rotor core 24 along the central shaft 22. The positioning groove 41 on the small magnet 21 is aligned with the positioning post 42 on the copper sleeve 23 and pressed in. A copper sheet 26 is pressed onto the small magnet 21 along the central shaft 22. A Hall circuit board 13 is sleeved on the central shaft 22 above the small magnet 21. The limiting grooves 7 on both sides of the Hall circuit board 13 are inserted into the limiting bosses 6 of the upper wire frame 121. Two Hall elements 3 with an included angle of 60° are fixedly installed at the bottom of the Hall circuit board 13. Finally, the end of the central shaft 22 is rotatably connected to the rear cover 101 through a second bearing 10, and the central shaft 22 is rotatably connected to the machine housing 9 through a first bearing 8. The rear cover 101 is inserted into the machine housing 9 and fixedly connected thereto. This brushless motor controls the precise operation of the motor through the small magnet 21 and the Hall on the Hall circuit board 13.

[0049] The technical effect of the embodiment of the present utility model is that this brushless electric toothbrush motor can not only enhance the precision and reliability of the motor, achieve a large - amplitude sweep and vibration of the motor, meet the requirements of the Bass brushing method, improve the user experience, but also limit the positions of the small magnet, the magnet steel sheet and the Hall circuit board, ensure the stability during the operation of the motor, improve the quality of the brushless electric toothbrush, and extend the service life of the electric toothbrush.

[0050] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "upper", "lower", "top", "bottom", "front", "rear", "inner", "outer", "back", "middle", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0051] However, the above are only specific embodiments of the present utility model, and the scope of implementation of the present utility model cannot be limited thereby. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the scope of patent protection of the present utility model shall still fall within the scope covered by the claims of the present utility model.

Claims

1. A brushless electric toothbrush motor, comprising a stator assembly (1) and a rotor assembly (2), characterized in that: The stator assembly (1) comprises a stator core (11), a bobbin (12) and a Hall circuit board (13); the stator core (11) is connected to the Hall circuit board (13) via the bobbin (12); the rotor assembly (2) comprises a small magnet (21) and a central axis (22) penetrating the stator assembly (1); the small magnet (21) is coaxially plugged with the central axis (22); a plurality of Hall elements (3) distributed at an angle are mounted on the Hall circuit board (13); the Hall element (3) is located above the small magnet (21).

2. The brushless electric toothbrush motor according to claim 1, characterized in that: The included angle between the Hall elements (3) is 60°.

3. The brushless electric toothbrush motor according to claim 1, characterized in that: The rotor assembly (2) further comprises a copper sleeve (23) plugged into the central shaft (22); the copper sleeve (23) is plugged into the small magnet (21) via a positioning component (4).

4. The brushless electric toothbrush motor according to claim 3, characterized in that: The positioning component (4) comprises a positioning groove (41) and a positioning column (42); the positioning groove (41) is provided on the inner ring of the small magnet (21); the positioning column (42) is fixedly mounted on the periphery of the copper sleeve (23); and the positioning column (42) is adapted to be plugged into the positioning groove (41).

5. The brushless electric toothbrush motor according to claim 4, characterized in that: The positioning groove (41) is an arc-shaped structure.

6. The brushless electric toothbrush motor according to claim 1, characterized in that: The rotor assembly (2) further comprises a rotor core (24), a magnetic steel sheet (25) and a copper sheet (26); the rotor core (24) and the copper sheet (26) are both plugged into the central shaft (22); the copper sheet (26) is pressed against the small magnet (21); a plurality of grooves (5) are circumferentially arranged on the rotor core (24); and the magnetic steel sheet (25) is plugged into the grooves (5).

7. The brushless electric toothbrush motor according to claim 6, characterized in that: The groove (5) comprises an inner groove (51) and an outer groove (52), wherein the outer groove (52) is arranged on the outer side of the inner groove (51), the width of the inner side of the transverse cross section of the inner groove (51) is smaller than the width of the outer side thereof, and the width of the inner side of the transverse cross section of the outer groove (52) is larger than the width of the outer side thereof.

8. The brushless electric toothbrush motor according to claim 6, characterized in that: The bobbin (12) is inserted and installed on the inner side of the stator core (11), the rotor core (24) and the magnetic steel sheet (25) are arranged on the inner side of the bobbin (12), the bobbin (12) comprises an upper bobbin (121) and a lower bobbin (122), the upper bobbin (121) is located above the lower bobbin (122), a limiting boss (6) is arranged on the upper bobbin (121), and the limiting boss (6) is adapted to be plugged into a limiting groove (7) on the Hall circuit board (13).

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