Motor and electric toothbrush

Abstract

The utility model discloses a motor and an electric toothbrush. The motor comprises a shell; the rotor is arranged in the shell and comprises a motor shaft, and a limiting piece is arranged on the motor shaft; the stator surrounds at least part of the circumferential direction of the rotor, the stator is provided with at least two stopping parts, the two stopping parts are arranged at intervals, the stator can drive the motor shaft to rotate in a reciprocating mode in the circumferential direction at a preset angle, and the limiting piece can be in alternate limiting fit with the two stopping parts; the magnetic field adjusting element is suitable for resetting the rotor after the motor is powered off. Therefore, when the motor is powered on to enable the stator to selectively drive the motor shaft to rotate back and forth at the preset angle, the reciprocating rotation control of the motor shaft can be more accurate through alternate limiting cooperation of the limiting piece and the two stopping parts, and the rotor is driven to reset through the magnetic field adjusting element when the motor is powered off. A complex mechanical structure is not needed to reset the rotor, mechanical loss is avoided, the cost of the motor can be reduced, and the size of the motor is reduced.

Description

Technical Field

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

[0002] With the development of technology and the improvement of people's living standards, electric toothbrushes have gradually become more popular in life due to their greater ease of use and better cleaning effect on teeth. The output shaft of the motor of an electric toothbrush rotates in a large circumferential angle, thereby driving the brush head to rotate in a circumferential direction to automatically clean the user's teeth.

[0003] In existing technologies, the circumferential rotation of the output shaft of an electric toothbrush motor is very prone to instability and disorder, resulting in poor control of the motor's output shaft rotation. This reduces the user experience and may even damage the user's teeth. Furthermore, after the motor is powered off, the electric toothbrush needs to have a mechanical structure to control the rotor to reset, which not only causes mechanical losses but also increases the cost and size of the motor. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a motor whose circumferential reciprocating rotation of the motor shaft is more stable and reliable, and whose reset is simpler.

[0005] This utility model further proposes an electric toothbrush.

[0006] The motor according to an embodiment of the present invention includes: a housing; a rotor, the rotor being disposed within the housing and including a motor shaft, the motor shaft extending at least partially from the housing, and a limiting member being disposed on the motor shaft; a stator, the stator being disposed within the housing, the stator surrounding at least a portion of the rotor's circumference, the stator having at least two stop portions spaced apart, the stator capable of driving the motor shaft to reciprocate in the circumferential direction at a preset angle, the limiting member being capable of alternately limiting and cooperating with the two stop portions; the stator further includes a magnetic field adjustment element, the magnetic field adjustment element being adapted to reset the rotor after the motor is powered off.

[0007] Therefore, when the motor is powered on, the stator selectively drives the motor shaft to reciprocate at a preset angle. When the motor shaft rotates to its maximum angle, the stop part will abut against the limiting part, thereby limiting the maximum rotation angle of the motor shaft. The reciprocating rotation control of the motor shaft is more precise, and there will be no motor shaft rotation disorder. This can improve the rotational stability of the motor shaft. Furthermore, when the motor is powered off, the rotor is driven to reset by the magnetic field adjustment element. There is no need to set up complex software algorithms or set up circuit boards on the motor, which helps to reduce the size of the motor and greatly reduces the cost of the motor, thus significantly improving economic benefits.

[0008] In some examples of this utility model, the magnetic field regulating element has a notch on the side facing the rotor. The rotor includes multiple magnetic components, which are circumferentially spaced on the motor shaft and include at least one N-pole magnetic component and at least one S-pole magnetic component. After the motor is powered off, the notch can balance the magnetic field, so that the spacing between adjacent N-pole and S-pole magnetic components corresponds to the position of the notch, thereby resetting the rotor.

[0009] With this configuration, N-pole and S-pole magnets are spaced apart on the motor shaft. The notch can divide the magnetic field and interfere with it. When the motor is powered off, the N-pole and S-pole magnets on the motor shaft can be relatively symmetrically distributed on both sides of the notch, so that the magnetic field is balanced. By utilizing the balance of the magnetic field by the notch, the motor shaft can be reset.

[0010] In some examples of this utility model, the stator includes a first coil assembly, which is arranged around the outer periphery of the rotor. The magnetic field adjustment element includes a main body, a through part, and a reset part. The main body is arranged around the outer periphery of the first coil assembly. The through part passes through the first coil assembly and its two ends are respectively connected to the main body and the reset part. The reset part is arranged radially spaced from the rotor. The notch part is arranged on the side of the reset part facing the rotor.

[0011] With this configuration, the main body and the through-hole part can directly or indirectly fix the first coil assembly, and optimize or enhance the magnetic field generated by the first coil assembly. The notch part is located on the reset part, which will not interfere with the first coil assembly, and further realizes the reset of the rotor after the motor is powered off.

[0012] In some examples of this utility model, the multiple magnetic components include two S-pole magnetic components and two N-pole magnetic components. In the circumferential direction of the motor shaft, the arrangement order of the two S-pole magnetic components and the two N-pole magnetic components is S-pole magnetic component, N-pole magnetic component, N-pole magnetic component and S-pole magnetic component.

[0013] With this configuration, the magnets on the motor shaft are arranged in such a way that the number of adjacent N-pole and S-pole magnets is relatively reduced. As a result, after the motor is powered off, the magnetic field adjustment element can adjust the magnetic field balance of the N-pole and S-pole magnets, thereby achieving rotor reset. Fewer adjacent N-pole and S-pole magnets result in fewer rotor balance positions, allowing the rotor to reset at the expected angle. When the motor is connected to the brush head, that is, after the motor is powered off, the brush head can stop within its angular range.

[0014] In some examples of this utility model, the angle range of the rotor is the angle range formed by two adjacent stop portions; within the angle range of the rotor, the notch portion corresponds to a pair of adjacent N-pole magnets and S-pole magnets.

[0015] With this configuration, within the angular range that the rotor can rotate, the notch corresponds to a pair of adjacent N-pole and S-pole magnetic components. Thus, after the motor is powered off, the notch balances the pair of N-pole and S-pole magnetic components. In other words, when the rotor rotates to the position between the N-pole and S-pole magnetic components, the position of the notch corresponds to the position of the rotor. Therefore, the rotor's reset position is basically determined, resulting in greater stability and operability of the motor, making it easier to use.

[0016] In some examples of this utility model, the magnetic field adjustment element is a soft magnetic material component.

[0017] In some examples of this utility model, the magnetic field regulating element is a hard magnetic material component. The reset part of the hard magnetic material component has an N' pole and an S' pole. After the motor is powered off, the N' pole and the S' pole are located on both sides of the notch, respectively. The N' pole is disposed adjacent to the S pole, and the S' pole is disposed adjacent to the N pole.

[0018] With this configuration, the magnetic field regulating element is made of hard magnetic material. After the motor is powered off, the N' and S' magnetic poles will balance with the rotor's magnetic components. A weaker magnetic field is formed at the gap, thus creating an interval. This allows the N' magnetic pole to attract the S magnetic component, and the S' magnetic pole to attract the N magnetic component, further achieving rotor reset.

[0019] In some examples of this utility model, the limiting member includes a fixing part and a rod part. The fixing part is sleeved on the motor shaft, the rod part is connected to the fixing part and extends radially, and the rod part is located between two stop parts.

[0020] With this design, the fixing part ensures that the limiting component moves synchronously with the motor shaft, the rod part limits the rotation angle of the motor shaft, and the limiting component achieves the rotation limit of the motor shaft through a clever structure. The structure is simple and helps to reduce the size of the motor.

[0021] In some examples of this utility model, the first coil assembly includes a wire frame and a coil, the wire frame being circumferentially arranged around the outside of the rotor, the coil being disposed on the wire frame, and the wire frame being provided with a stop portion.

[0022] With this configuration, the wire frame is used to fix the coil components, and the motor shaft is limited by setting a stop on the wire frame. This structural optimization is achieved from the existing structure of the motor without adding any other components, which helps to reduce the size of the motor and further reduces costs.

[0023] In some examples of this utility model, the motor further includes a magnetic ring assembly and a second coil assembly. The magnetic ring assembly is sleeved on the outer periphery of the motor shaft, and the second coil assembly is circumferentially arranged around the outer side of the magnetic ring assembly and radially spaced from the magnetic ring assembly. The magnetic ring assembly has different magnetic poles alternately arranged in the axial direction, so that the second coil assembly can drive the magnetic ring assembly to drive the motor shaft to reciprocate in the axial direction.

[0024] With this configuration, the magnetic ring assembly and the second coil assembly enable the motor shaft to move along the axial direction, thereby enriching the motor's degrees of freedom and further enhancing the motor's application scenarios.

[0025] In some examples of this utility model, the motor also includes a reset ring, which is disposed inside the housing and partially capable of elastic deformation. The reset ring is sleeved on the motor shaft so as to elastically deform when the second coil assembly drives the motor shaft to move axially, and to reset the motor shaft after the second coil assembly is de-energized.

[0026] With this configuration, the reset ring can reset the motor shaft after axial movement. At the same time, the reset ring can optimize the movement of the motor shaft, making the movement of the motor shaft smoother and more stable, which further enhances the reliability and stability of the motor.

[0027] In some examples of this utility model, the reset ring includes an outer ring, a middle ring, and an inner ring. The outer ring is circumferentially arranged around the outside of the middle ring and fixed to the housing. The outer ring and the middle ring are radially spaced apart. A radially extending first elastic connecting arm connects the outer ring and the middle ring. The middle ring is circumferentially arranged around the outside of the inner ring and radially spaced apart from the inner ring. A radially extending second elastic connecting arm connects the inner ring and the middle ring. The inner ring is sleeved on the bearing of the motor shaft.

[0028] With this configuration, the first elastic connecting arm and the second elastic connecting arm achieve a stable connection between the outer ring, the middle ring and the inner ring, and allow the middle ring and the inner ring to achieve a large degree of elastic deformation, which is conducive to the stable reset of the motor shaft by the reset ring, and further enhances the motion stability and smoothness of the motor.

[0029] In some examples of this utility model, the first elastic connecting arms are at least two and at least partially arranged opposite each other in the radial direction, and the second elastic connecting arms are at least two and at least partially arranged opposite each other in the radial direction.

[0030] This configuration, with multiple first elastic connecting arms and multiple second elastic connecting arms, enhances the connection stability of the outer ring, middle ring, and inner ring. Furthermore, at least some of the first elastic connecting arms are arranged radially opposite each other. This allows the first elastic connecting arms to enhance connection stability while reducing the pulling force on the outer and middle rings in other directions, further reducing the relative elastic deformation of the middle ring. Similarly, the second elastic connecting arms reduce the pulling force on the inner and middle rings in other directions, which helps to ensure the relative elastic deformation of the inner ring. This combination of connection stability and elasticity requirements is beneficial for the long-term use of the motor.

[0031] In some examples of this utility model, there are two first elastic connecting arms arranged opposite each other in the radial direction, and two second elastic connecting arms arranged opposite each other in the radial direction; the radial directions of the first elastic connecting arms and the radial directions of the second elastic connecting arms are different.

[0032] With this configuration, the first and second elastic connecting arms are located in different radial directions, which enables the reset ring to achieve progressive elastic deformation and relatively stable elastic performance. If the first and second elastic connecting arms were located in the same radial direction, i.e., on the same line, the inner and middle rings would receive tensile forces in the same direction. When the tensile force is small, neither could deform, but when a certain tensile force was reached, they would elastically deform simultaneously. However, by setting them in different radial directions, the middle and inner rings can undergo alternating deformation due to the tensile forces in different directions, resulting in progressively changing elastic performance. This is beneficial for improving the smoothness and stability of the motor shaft movement and further for the long-term use of the motor.

[0033] In some examples of this utility model, the radial direction of the first elastic connecting arm is perpendicular to the radial direction of the second elastic connecting arm.

[0034] With this configuration, the gradual deformation of the middle and inner rings is more pronounced, and the reset ring has good elasticity, which is beneficial for its use.

[0035] In some examples of this invention, the axial thickness of the first elastic connecting arm is greater than the axial thickness of the second elastic connecting arm.

[0036] With this configuration, since the first elastic connecting arm connects the outer ring and the middle ring, and the second elastic connecting arm connects the middle ring and the inner ring, and the thickness of the first elastic connecting arm is greater than that of the second elastic connecting arm, as the tensile force gradually increases, the inner ring will deform relatively first, and the middle ring will deform relatively later. Since the motor shaft is connected to the inner ring, the inner ring can undergo elastic deformation well with the movement of the motor shaft, and the middle ring further buffers the movement. This further improves the smoothness and stability of the motor shaft movement, which is beneficial to the use of the motor.

[0037] An electric toothbrush according to an embodiment of the present invention includes: a handle, a brush head, and the aforementioned motor, wherein the motor is disposed inside the handle and the brush head is disposed on the motor shaft.

[0038] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0039] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0040] Figure 1 This is a schematic diagram of a motor according to an embodiment of the present utility model;

[0041] Figure 2 This is a partial schematic diagram of a motor according to an embodiment of the present utility model;

[0042] Figure 3 This is a cross-sectional view of a motor according to an embodiment of the present utility model;

[0043] Figure 4 This is a schematic diagram of the front reset ring, the rear reset ring, and the motor shaft according to an embodiment of the present utility model;

[0044] Figure 5 This is a partial schematic diagram of a motor according to an embodiment of the present utility model;

[0045] Figure 6 This is a partial schematic diagram of a motor according to an embodiment of the present utility model;

[0046] Figure 7 This is a schematic diagram of the rear reset ring according to an embodiment of the present utility model;

[0047] Figure 8 This is a schematic diagram of the front reset ring according to an embodiment of the present utility model;

[0048] Figure 9 This is a partial schematic diagram of the stator and rotor according to an embodiment of the present utility model;

[0049] Figure 10This is a cross-sectional view of a motor according to an embodiment of the present utility model;

[0050] Figure 11 This is a cross-sectional view of a motor according to an embodiment of the present utility model.

[0051] Figure label:

[0052] 100. Electric motor;

[0053] 10. Shell;

[0054] 20. Rotor; 21. Motor shaft; 22. Limiting component; 221. Fixing part; 222. Rod part; 23. Magnet component; 231. S pole magnet component; 232. N pole magnet component; 24. Rotor inner core component; 25. Front positioning bushing; 26. Rear positioning bushing;

[0055] 30. Stator; 31. First coil assembly; 32. Coil component; 33. Wire frame component; 331. Stop part; 34. Magnetic field adjustment element; 341. Main body part; 342. Through part; 343. Reset part; 3431. Notch part; 3432. N' pole part; 3433. S' pole part;

[0056] 40. Magnetic ring assembly; 401. Magnetic ring component; 4011. N-pole magnetic ring; 4012. S-pole magnetic ring; 41. Second coil assembly;

[0057] 50. Front reset ring; 51. Front outer ring; 52. Front middle ring; 53. Front inner ring; 531. Front locking part; 532. Front limiting step; 54. Front first elastic connecting arm; 55. Front second elastic connecting arm; 56. Front bearing;

[0058] 60. Rear reset ring; 61. Rear outer ring; 62. Rear middle ring; 63. Rear inner ring; 631. Rear locking part; 632. Rear limiting step; 64. Rear first elastic connecting arm; 65. Rear second elastic connecting arm; 66. Rear bearing. Detailed Implementation

[0059] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0060] The following is for reference. Figures 1-11 The present invention describes a motor 100 according to an embodiment of the present invention, which can be applied to an electric toothbrush.

[0061] Combination Figures 1-11As shown, the motor 100 according to this utility model mainly includes: a housing 10, a rotor 20, and a stator 30. The rotor 20 and the stator 30 are both disposed inside the housing 10. The rotor 20 includes a motor shaft 21 that extends out of the housing 10. A limiting member 22 is provided on the motor shaft 21. The stator 30 surrounds at least a portion of the rotor 20 in the circumferential direction. The stator 30 is provided with two stop portions 331 that are spaced apart. The stator 30 can drive the motor shaft 21 to reciprocate in the circumferential direction at a preset angle. The limiting member 22 can alternately limit and cooperate with the two stop portions 331.

[0062] Specifically, by setting the limiting member 22 on the motor shaft 21 and having the stator 30 surround at least a portion of the rotor 20 in the circumferential direction, when the motor 100 is energized, the stator 30 can drive the rotor 20 to rotate, that is, it can drive the motor shaft 21 to reciprocate in the circumferential direction at a preset angle. The limiting member 22 reciprocates in the circumferential direction with the motor shaft 21 at a preset angle. When the limiting member 22 rotates at a preset angle, it can limit the rotation angle of the motor 100 by abutting against the stop part 331.

[0063] It should be understood that the stop part 331 limits the maximum angle of rotation of the rotor 20. Under certain operating conditions, the limiting part 22 on the motor shaft 21 may not contact the stop part 331.

[0064] In some embodiments of this utility model, the stator 30 may be entirely surrounding the circumferential outer side of the rotor 20.

[0065] Furthermore, the limiting member 22 has a radially extending rod portion 222, which is spaced between two stop portions 331. The stator 30 selectively drives the motor shaft 21 to reciprocate at a preset angle so that the rod portion 222 alternately limits the engagement with the two stop portions 331.

[0066] Specifically, the rotor 20 and the stator 30 are both housed in the housing 10. After the first coil assembly 31 of the stator 30 is energized, the rotor 20 can be driven to move. The housing 10 can protect the rotor 20 and the stator 30, preventing external foreign objects from corroding or external forces from damaging the rotor 20 or the stator 30, or affecting the movement of the rotor 20.

[0067] Furthermore, the rotor 20 includes a rotor core 24 and multiple magnets 23. The rotor core 24 is sleeved on the motor shaft 21, and the multiple magnets 23 are spaced apart in the circumferential direction of the rotor core 24. As permanent magnets, the magnets 23 enable the motor 100 to have a stable magnetic field. This magnetic field interacts with the magnetic field generated by the current after the first coil assembly 31 of the stator 30 is energized, thereby causing the magnets 23 to be subjected to force, which further generates torque to drive the rotor 20 to rotate. Specifically, the multiple magnets 23 have different magnetic poles. When the first coil assembly 31 of the stator 30 is alternately energized with current in different directions, the first coil assembly 31 generates magnetic fields in different directions, causing the multiple magnets 23 with different magnetic poles to be attracted or repelled. By reasonably setting the positions of the multiple magnets 23, the rotor 20 can be made to reciprocate. Since the rotation speed of the rotor 20 is very fast, usually reaching tens of thousands of times per minute, high-frequency vibration is generated.

[0068] It should be noted that the motor shaft 21 extends at least partially from the housing 10. When the motor 100 of this invention is applied to an electric toothbrush, the brush head of the electric toothbrush can be installed on the part of the motor shaft 21 that extends from the housing 10. This allows the brush head to vibrate in accordance with the high-frequency vibration of the rotor 20 and the motor shaft 21, thereby cleaning the user's teeth.

[0069] By setting a limiting member 22 on the motor shaft 21, and having the radially extending rod 222 of the limiting member 22 spaced between the two stop portions 331 of the stator 30, with the two stop portions 331 being radially spaced apart, after energizing the first coil assembly 31 of the stator 30, the stator 30 will drive the motor shaft 21 to reciprocate at a preset angle. This allows the rod 222 of the limiting member 22 to rotate closer to one of the two stop portions 331. When the rod 222 rotates to the preset angle, under the corresponding working condition, after rotating to the maximum angle, the rod 222 contacts and limits one of the two stop portions 331. Then, the rod 222 of the limiting member 22 rotates in the opposite direction, rotating closer to the other of the two stop portions 331 until it contacts and limits the other. This cycle repeats continuously, preventing the rotation of the motor shaft 21 from exceeding the preset angle and improving the rotational stability and reliability of the motor shaft 21.

[0070] It should be noted that in the prior art, the motor 100 controls the rotation of the motor shaft 21 by setting a sensor to detect the rotation angle of the motor shaft 21. In this process, unavoidable assembly errors of the motor 100 or unavoidable slight deviations during the rotation of the motor shaft 21 will affect the sensor's detection, resulting in inaccurate sensor results and discontinuous rotation of the motor shaft 21, causing the motor shaft 21 to wobble. However, in this invention, before assembling the motor 100, the manufacturing personnel have already completed the program debugging for how long the first coil assembly 31 of the stator 30 should be energized to allow the motor shaft 21 of the rotor 20 and the rod 222 of the limiting member 22 to rotate to a preset angle. Thus, when the motor 100 is assembled and working normally, the stator 30 only needs to be energized according to the predetermined program to allow the rotor 20 to rotate stably, which can further improve the rotational stability of the motor shaft 21.

[0071] Combination Figure 6 As shown, the limiting member 22 may mainly include a fixing part 221 and a rod part 222. The fixing part 221 is sleeved on the motor shaft 21 and is circular. The rod part 222 is connected to the fixing part 221 and extends in the radial direction. The number of rod parts 222 can be one, two, three, or more.

[0072] In this embodiment, there are two rods 222, which are respectively disposed on both sides of the fixing part 221 and are disposed opposite to each other; it can be understood that in other embodiments, the number of rods 222 may be other depending on different working conditions.

[0073] Specifically, by fitting the circular fixing part 221 onto the motor shaft 21, the limiting member 22 can be fixed on the motor shaft 21. Two rods 222 are respectively positioned on the radial sides of the fixing part 221. With this configuration, when the motor shaft 21 rotates to a preset angle, the rods 222 on the radial sides of the fixing part 221 will contact and limit the movement of the two stops 331 respectively. Similarly, when rotating in the opposite direction to the preset angle, the rods 222 on the radial sides of the fixing part 221 will also contact and limit the movement of the two stops 331 respectively. This makes the limiting fit between the limiting member 22 and the stops 331 more stable, the force is dispersed and more evenly distributed, reducing the risk of breakage or damage to the rods 222 of the limiting member 22 and improving the reliability of the limiting member 22.

[0074] Combination Figure 6As shown, the connection line between the end of the stop portion 331 and the motor shaft 21 is designated as the first line, and the extension line of the rod portion 222 is designated as the second line. An angle α exists between the first and second lines, satisfying the relationship: 2°≤α≤40°. Specifically, when the first coil assembly 31 of the stator 30 is not energized, the rod portion 222 is spaced between the two stop portions 331, and the distance from the rod portion 222 to the two stop portions 331 is equal. After designating the connection line between the end of the stop portion 331 and the motor shaft 21 as the first line and the extension line of the rod portion 222 as the second line, the first and second lines intersect to form an angle α, which satisfies the relationship: 2°≤α≤40°. When the motor is used in an electric toothbrush, the rotation angle of the motor shaft 21 within this range allows for better cleaning.

[0075] In this embodiment of the utility model, 2°≤α≤10°, the rotation amplitude of the motor shaft 21 can meet the cleaning requirements while protecting the user's gums. Furthermore, without changing the power of the motor 100, the vibration amplitude and vibration frequency of the motor 100 can be balanced, thereby improving the performance of the motor 100, which in turn improves the cleaning effect of the electric toothbrush and enhances the user's experience with the electric toothbrush.

[0076] It should be noted that the included angle α is the preset angle for the rotation of the motor shaft 21. That is, when the motor shaft 21 drives the limiting member 22 to rotate by an angle α, the rod part 222 on the limiting member 22 will contact and limit the stop part 331.

[0077] Combination Figure 6 As shown, the stator 30 includes a first coil assembly 31, which includes a wire frame 33 and a coil 32. The wire frame 33 is circumferentially arranged around the outside of the rotor 20, and the coil 32 is disposed on the wire frame 33. The wire frame 33 is provided with a stop portion 331. Specifically, by disposing of the coil 32 on the wire frame 33, the wire frame 33 can ensure the stability of the coil 32, thereby ensuring the rotational stability of the rotor 20 after the coil 32 is energized.

[0078] Furthermore, since the stop part 331 and the rod part 222 of the limiting member 22 will make contact and limit each other, there will be an interaction force between them. Therefore, by setting the stop part 331 on the wire frame member 33 and setting the stop part 331 to be offset from the coil member 32 in the axial direction of the motor, the rod part 222 of the limiting member 22 can be prevented from hitting the coil member 32. In this way, the wire frame member 33 can limit the rod part 222 of the limiting member 22 while also protecting the coil member 32. This can further improve the stability and reliability of the coil member 32, further ensure that the motor 100 has better structural stability, and help ensure the long-term use of the motor 100.

[0079] Combination Figure 5 As shown, the stator 30 also includes a magnetic field adjustment element 34, which is adapted to reset the rotor 29 after the motor 100 is powered off. Specifically, the stator 30 also includes a magnetic field adjustment element 34, which can improve or enhance the magnetic field generated by the coil element 32, and can also reset the rotor 20 through magnetic drive after the motor 100 is powered off.

[0080] Combination Figure 5 As shown, the magnetic field regulating element 34 has a notch 3431 on the side facing the rotor 20. The rotor 20 includes a magnet 23. Multiple magnets 23 are circumferentially spaced on the motor shaft 21 and include at least one N-pole magnet 232 and at least one S-pole magnet 231. After the motor 100 is de-energized, the notch 3431 can balance the magnetic field, so that the spacing area of ​​adjacent N-pole magnets 232 and S-pole magnets 231 corresponds to the position of the notch 3431, so that the rotor 20 is reset. Specifically, by providing a notch 3431 on the side of the magnetic field regulating element 34 facing the rotor 20, after the motor 100 is powered off, the magnetic field of the magnetic field regulating element 34 is weakest near the notch 3431, so that the notch 3431 corresponds to the interval area of ​​the two adjacent N-pole magnets 232 and S-pole magnets 231, thereby the magnetic field can be in a balanced state, and the multiple magnets 23 can be in a balanced state, thereby realizing the reset of the rotor 20.

[0081] In some embodiments of this utility model, the angular range of the rotor 20 is the angular range formed by two adjacent stop portions 331. Within the angular range of the rotor 20, the notch portion 3431 corresponds to a pair of adjacent N-pole magnetic elements 232 and S-pole magnetic elements 231. Within the angular range in which the rotor 20 can rotate, the notch portion 3431 corresponds to a pair of adjacent N-pole magnetic elements 232 and S-pole magnetic elements 231. Thus, after the motor 100 is de-energized, the notch portion 3431 balances the pair of N-pole magnetic elements 232 and S-pole magnetic elements 231. That is, when the rotor 20 rotates to the position where the interval between the N-pole magnetic elements 232 and S-pole magnetic elements 231 corresponds to the position of the notch portion 3431, the reset position of the rotor 20 is basically determined, the stability and operability of the motor 100 are stronger, and it is easier to use.

[0082] Furthermore, combined Figure 5As shown, the stator 30 includes a first coil assembly 31, which is disposed around the outer periphery of the rotor 20. The magnetic field adjustment element 34 includes a main body 341, a through part 342, and a reset part 343. The main body 341 is disposed around the outer periphery of the first coil assembly 31. The through part 342 passes through the first coil assembly 31 and its two ends are respectively connected to the main body 341 and the reset part 343. The reset part 343 is radially spaced from the rotor 20. A notch 3431 is disposed on the side of the reset part 343 facing the rotor 20.

[0083] Specifically, the first coil assembly 31 is arranged around the outer periphery of the rotor 20. After the first coil assembly 31 is energized, the rotor 20 can be driven to rotate. Furthermore, the main body 341 is arranged around the outer periphery of the first coil assembly 31. One end of the through part 342 is connected to the main body 341. After the through part 342 passes through the first coil assembly 31, the other end of the through part 342 is connected to the reset part 343. The magnetic field adjustment element 34 can reduce hysteresis loss and improve the efficiency of the motor 100.

[0084] Furthermore, the reset part 343 and the stator 30 are arranged radially spaced apart. There are two reset parts 343 and two through parts 342. The two through parts 342 are arranged opposite each other in the radial direction, and both through parts 342 extend radially and pass through the first coil assembly 31. There are also two reset parts 343, which are respectively connected to the two through parts 342. The two reset parts 343 are also arranged opposite each other in the radial direction.

[0085] In some embodiments of this utility model, the reset part 343 is arc-shaped, and a notch 3431 is provided on the side of the reset part 343 facing the rotor 20. The magnetic poles of two adjacent magnetic members 23 on the circumferential direction of the motor shaft 21 are different. The position of the notch 3431 corresponds to the interval area of ​​the two adjacent magnetic members 23. After the first coil assembly 31 of the stator 30 is de-energized, the stator 30 will not drive the rotor 20 to rotate. By providing the notch 3431 on the side of the reset part 343 facing the rotor 20, and making the opening of the notch 3431 also face the rotor 20, the rotor 20 can be reset by corresponding the notch 3431 to the interval area of ​​the two adjacent magnetic members 23 with different magnetic poles. After the reset, the rod part 222 of the limiting member 22 on the rotor 20 will return to the position between the energized parts, that is, the rod part 222 of the limiting member 22 is located between the two stop parts 331 and the distance between the rod part 222 and the two stop parts 331 is equal. In some embodiments of this utility model, the reset part 343 is crescent-shaped.

[0086] In some embodiments of this utility model, the number of magnetic components 23 is even. Given that the total number of S-pole magnetic components 231 and N-pole magnetic components 232 is even, it is necessary to ensure that the number of S-pole magnetic components 231 and N-pole magnetic components 232 are the same. In other embodiments of this utility model, the number of magnetic components 23 is an even number greater than 4.

[0087] In some specific embodiments of this utility model, combined with Figure 1 As shown, the plurality of magnetic components 23 include two S-pole magnetic components 231 and two N-pole magnetic components 232. In the circumferential direction of the motor shaft, the arrangement order of the two S-pole magnetic components 231 and the two N-pole magnetic components 232 is S-pole magnetic component, N-pole magnetic component, N-pole magnetic component and S-pole magnetic component, or S-pole magnetic component, S-pole magnetic component, N-pole magnetic component and N-pole magnetic component. The notch portion 3431 is located in the circumferential center of the reset portion 343. After the motor 100 is de-energized, the notch portion 3431 corresponds to the interval area between the N-pole magnetic component 232 and the S-pole magnetic component 231.

[0088] Specifically, by arranging the two S-pole magnets 231 and the two N-pole magnets 232 in the order of S-pole magnet, N-pole magnet, N-pole magnet and S-pole magnet, or S-pole magnet, S-pole magnet, N-pole magnet and N-pole magnet, the magnetic field distribution can be made more uniform, reducing magnetic field distortion and leakage, thereby improving electromagnetic conversion efficiency. In addition, the operation of the motor 100 can be made more stable, reducing mechanical vibration and noise.

[0089] Furthermore, there are two reset parts 343. After the motor 100 is de-energized, the notches 3431 on the two reset parts 343 correspond to the interval areas between the two N-pole magnets 232 and the two S-pole magnets 231, respectively.

[0090] Based on the above-described technical solutions, this utility model discloses several embodiments, among which,

[0091] In Embodiment 1: The magnetic field adjustment element 34 is a soft magnetic material with high permeability. When the magnet 23 of the rotor 20 approaches the soft magnetic material, the soft magnetic material is magnetized, generating an induced magnetic field. This causes an attraction between the magnet 23 of the rotor 20 and the soft magnetic material. For example, the portion of the soft magnetic material opposite to and adjacent to the S-pole magnet 231 is magnetized into an N-pole, and the S-pole magnet 231 attracts the N-pole of the soft magnetic material. Similarly, the portion of the soft magnetic material opposite to and adjacent to the N-pole magnet 232 is magnetized into an S-pole, and the N-pole magnet 232... 232 will attract the S pole of the soft magnetic material component, and the notch 3431 can form a region with a weak magnetic field in the circumferential center of the soft magnetic material component. This allows the N pole magnet 232 and the S pole magnet 231 to rotate to the vicinity of the notch 3431, where the attractive force is minimal. This allows the magnets 23 on both sides of the notch 3431 to reach a state of force balance, thereby making the rotor 20 stationary. At the same time, the limiting member 22 also reaches the reset position, that is, the motor shaft 21 and the limiting member 22 are reset.

[0092] It should be noted that when the electromagnetic field generated after the coil component 32 is energized drives the motor shaft 21 to rotate, the soft magnetic material component will also be magnetized and attract the magnet component 23. However, compared with the driving force of the coil component 32, the attraction of the soft magnetic material component is small and will not significantly affect the operation of the motor 100.

[0093] This embodiment of the invention eliminates the need for complex mechanical structures to reset the rotor 20. On the one hand, it prevents mechanical wear and extends the service life of the motor 100. On the other hand, since the soft magnetic material on the stator 30 is an inherent structure of the stator 30 itself, the rotor 20 can be reset after power failure simply by opening a notch 3431 at the aforementioned location. There is no need for other components, such as circuit boards or Hall elements, nor is there a need for control through complex algorithms. This can greatly reduce the cost of the motor 100. Furthermore, it can reduce the size of the motor 100, further enabling miniaturization of the motor 100.

[0094] Furthermore, in practical applications, before assembling the motor 100, it is necessary to adjust the size, area, and position of the notch 3431 in advance, and also to adjust the gap between the reset part 343 and the magnet 23 in advance to ensure the accuracy and stability of the balanced reset position. In some specific embodiments of this utility model, the gap between the reset part 343 and the magnet 23 is between 0.2 and 0.3 mm.

[0095] In some specific embodiments of this utility model, the magnetic field adjustment element 34 can be a silicon steel sheet, which has better magnetization efficiency and attractive force.

[0096] In Example 2:

[0097] The magnetic field adjustment element 34 is a hard magnetic material component. The reset part 343 of the hard magnetic material component has an N' magnetic pole part 3432 and an S' magnetic pole part 3433. The N' magnetic pole part 3432 and the N' magnetic pole part 3432 are located on both sides of the notch part 3431, respectively. After the motor 100 is de-energized, the N' magnetic pole part 3432 is disposed adjacent to the S magnetic element 231, and the S' magnetic pole part 3433 is disposed adjacent to the N magnetic element 232.

[0098] Specifically, by setting the magnetic field regulating element 34 to a hard magnetic material, which is also a permanent magnet material, and by setting the N' pole 3432 and the S' pole 3433 on the reset part 343 of the hard magnetic material, when the coil 32 is energized, the magnetic field generated by the coil 32 will directly act on the magnet 23 of the motor shaft 21, generating torque and driving the magnet 23 to rotate. At the same time, since the magnetic field regulating element 34 is a permanent magnet material, its magnetic field is fixed. The magnetic field generated after the coil 32 is energized will be superimposed with the magnetic field of the hard magnetic material to form a composite magnetic field. The composite magnetic field further optimizes the force on the magnet 23 on the motor shaft 21, making the rotation of the motor shaft 21 more stable and reliable.

[0099] When the coil 23 is not energized, the N' pole portion 3432 of the hard magnetic material is positioned adjacent to the S pole magnet 231 of the rotor 20. This arrangement ensures that when the coil 32 is energized, causing the magnet 23 to rotate, and when the motor 100 is de-energized, the N' pole portion 3432 of the hard magnetic material attracts the S pole magnet 231, and vice versa. This guides the motor shaft 21 and the limiting member 22 to gradually rotate towards the reset position. During this process, due to the design of the notch 3431, the notch 3431 alters the magnetic field regulating element 34. The shape of the magnetic field affects the magnetic field distribution of the magnetic field regulating element 34. The magnetic field of the magnetic field regulating element 34 is weakest near the notch 3431. Under the action of the magnetic force of the magnetic field regulating element 34, the space between the N-pole magnetic element 232 and the S-pole magnetic element 231 will gradually rotate to a position opposite to the notch 3431. When the space between the N-pole magnetic element 232 and the S-pole magnetic element 231 rotates to a position opposite to the notch 3431, the multiple magnetic elements 23 on the rotor 20 reach a balanced state. At this time, the rotor 20 is stationary and no longer rotates. At the same time, the limiting element 22 returns to the reset position, that is, the motor shaft 21 and the limiting element 22 are reset.

[0100] This embodiment of the invention eliminates the need for complex mechanical structures to reset the rotor 20. On the one hand, it prevents mechanical wear and extends the service life of the motor 100. On the other hand, since the hard magnetic material of the stator 30 is an inherent structure of the stator 30 itself, the rotor 20 can be reset after power failure simply by opening a notch 3431 at the aforementioned location. There is no need for other components, such as circuit boards or Hall elements, nor is there a need for control through complex algorithms. This can greatly reduce the cost of the motor 100. Furthermore, it can reduce the size of the motor 100, further enabling the miniaturization of the motor 100.

[0101] Furthermore, in practical applications, before assembling the motor 100, it is necessary to adjust the size, area, and position of the notch 3431 in advance, and also to adjust the gap between the reset part 343 and the magnet 23 in advance to ensure the accuracy and stability of the balanced reset position. In some specific embodiments of this utility model, the gap between the reset part 343 and the magnet 23 is between 0.2 and 0.3 mm.

[0102] This application also includes Embodiment 3 and Embodiment 4. Embodiment 3 is obtained by combining Embodiment 1 with the following technical solution, and Embodiment 4 is obtained by combining Embodiment 2 with the following technical solution. The common technical solution of Embodiments 3 and 4 is as follows:

[0103] Examples 3 and 4 are derived from Examples 1 and 2 by further disclosing the following technical solutions:

[0104] Combination Figure 3 , Figure 10 and Figure 11 As shown, the motor 100 may also mainly include a magnetic ring assembly 40 and a second coil assembly 41. Both the magnetic ring assembly 40 and the second coil assembly 41 are disposed inside the housing 10. The magnetic ring assembly 40 is sleeved on the outer periphery of the motor shaft 21. The second coil assembly 41 is circumferentially arranged around the outside of the magnetic ring assembly 40 and radially spaced from the magnetic ring assembly 40. The magnetic ring assembly 40 has different magnetic poles that are alternately arranged in the axial direction, so that the second coil assembly 41 selectively drives the magnetic ring assembly 40 to drive the motor shaft 21 to reciprocate in the axial direction.

[0105] Specifically, in the existing technology, since the sensor needs to detect the rotation angle of the motor shaft 21, but the motor shaft 21 also needs to move axially while reciprocating, the axial reciprocating movement of the motor shaft 21 causes the distance between the motor shaft 21 and the sensor to change continuously. As a result, the sensor's detection of the rotation angle of the motor shaft 21 will be unstable, or even intermittent failure. This will lead to disordered reciprocating rotation of the motor shaft 21 and reduce the user's experience of using the electric toothbrush.

[0106] In this embodiment of the invention, a magnetic ring assembly 40 is sleeved on the outer periphery of the motor shaft 21. The magnetic ring assembly 40 and the magnet component 23 are spaced apart axially. The magnetic ring assembly 40 has alternating magnetic poles in the axial direction, which can generate an alternating magnetic field. When the second coil assembly 41 is energized, it drives the magnetic ring assembly 40 and the motor shaft 21 to reciprocate axially. When the motor 100 is applied to an electric toothbrush, the first coil assembly 31 and the second coil assembly 41 are energized simultaneously. This allows the motor shaft 21 to drive the electric toothbrush head to reciprocate axially while simultaneously rotating the brush head at a preset angle, thereby cleaning the user's teeth from multiple angles. This design not only ensures stable and smooth simultaneous axial reciprocating movement and circumferential reciprocating rotation of the motor shaft 21, improving the user experience of the electric toothbrush, but also eliminates the need for sensors or other components, further miniaturizing the motor 100 and reducing its cost.

[0107] In some embodiments of this utility model, the magnetic ring assembly 40 includes a plurality of magnetic ring components 401, each of which includes an N-pole magnetic ring 4011 and an S-pole magnetic ring 4012. The number of magnetic ring components 401 is odd, and the N-pole magnetic ring 4011 and the S-pole magnetic ring 4012 are alternately arranged in sequence along the axial direction.

[0108] In some embodiments of this utility model, the motor 100 further includes a reset ring, which is disposed inside the housing 10 and partially capable of elastic deformation. The reset ring is sleeved on the motor shaft 21 so as to elastically deform when the second coil assembly 41 drives the motor shaft 21 to move axially, and to reset the motor shaft 21 after the second coil assembly 41 is de-energized.

[0109] Specifically, by placing the reset ring inside the housing 10 and sleeved on the motor shaft 21, since the reset ring can elastically deform, it can undergo elastic deformation when the second coil assembly 41 drives the motor shaft 21 to move axially. This can buffer and dampen the axial movement of the motor shaft 21, thereby improving the stability of the axial movement. On the other hand, the second coil assembly 41 resets the motor shaft 21 after power failure, eliminating the need for a complex mechanical structure to drive the motor shaft 21 to reset axially, thus simplifying the structural design of the motor 100.

[0110] In some embodiments of this utility model, the reset ring includes an outer ring, a middle ring, and an inner ring. The outer ring is circumferentially arranged around the outside of the middle ring and fixed to the housing 10. The outer ring and the middle ring are radially spaced apart, and a radially extending first elastic connecting arm connects the outer ring and the middle ring. The middle ring is circumferentially arranged around the outside of the inner ring and radially spaced apart from the inner ring. A radially extending second elastic connecting arm connects the inner ring and the middle ring. The inner ring is sleeved on the bearing of the motor shaft 21.

[0111] Specifically, by connecting the first elastic connecting arm between the spaced outer ring and the middle ring, and connecting the second elastic connecting arm between the spaced middle ring and the inner ring, the structural stability of the reset ring can be improved on the one hand, and the elastic deformation of the reset ring can be facilitated on the other hand. Thus, under the premise of stable reset ring structure, the effect of the reset ring in buffering and damping the axial movement of the motor shaft 21 through elastic deformation can be improved.

[0112] Furthermore, the inner ring is fitted onto the bearing of the motor shaft 21. This ensures the stability of the reset ring on the motor shaft 21 and also limits the position of the reset ring on the bearing of the motor shaft 21, thereby further improving the structural reliability of the motor 100.

[0113] In some embodiments of this invention, at least two first elastic connecting arms are arranged radially opposite each other, and at least two second elastic connecting arms are arranged radially opposite each other. Specifically, by setting at least two first elastic connecting arms and arranging them radially opposite each other, not only can the stability of the first elastic connecting portion connecting the outer ring and the middle ring be improved, but the uniformity and stability of the force on the reset ring can also be improved.

[0114] Combination Figure 1 As shown, there are two first elastic connecting arms arranged opposite each other in the radial direction, and two second elastic connecting arms arranged opposite each other in the radial direction; the radial directions of the first elastic connecting arms and the radial directions of the second elastic connecting arms are different.

[0115] Specifically, by setting two first elastic connecting arms that are radially opposite each other, and also setting two second elastic connecting arms that are radially opposite each other, this arrangement ensures that the first elastic connecting arms stably and reliably connect the outer ring and the middle ring, and that the second elastic connecting arms stably and reliably connect the middle ring and the inner ring. Furthermore, since the radial directions of the first and second elastic connecting arms are different, the first and second elastic connecting arms can be staggered, which can improve the uniformity of force on the reset ring.

[0116] Combination Figure 1As shown, the radial direction of the first elastic connecting arm is perpendicular to the radial direction of the second elastic connecting arm. This arrangement, without adding too many first and second elastic connecting arms to avoid affecting the elastic performance of the reset ring, allows the reset ring to be subjected to external forces more evenly, thereby further improving the stability and reliability of the reset ring.

[0117] Combination Figure 4 and Figure 8 As shown, the reset ring includes a front reset ring 50, which is disposed inside the housing 10 and has a front elastic part at least partially disposed in the middle. The front elastic part is sleeved on the motor shaft 21 to elastically deform when the second coil assembly 41 drives the motor shaft 21 to move axially.

[0118] Specifically, by placing the front reset ring 50 inside the housing 10 and connecting and fixing the front reset ring 50 to the housing 10, and by providing at least a front elastic portion in the middle of the front reset ring 50, and by sleeve the front elastic portion on the motor shaft 21, when the second coil assembly 41 drives the magnetic ring assembly 40 and the motor shaft 21 to reciprocate axially, the motor shaft 21 will cause the front elastic portion of the front reset ring 50 to undergo elastic deformation. In this way, on the one hand, the elastic deformation of the front elastic portion can buffer and dampen the axial movement of the motor shaft 21, thereby improving the stability of the axial movement of the motor shaft 21; on the other hand, the elastic deformation of the front elastic portion can also store energy for the axial reciprocating movement of the motor shaft 21, providing auxiliary driving force for the reciprocating movement of the motor shaft 21. Without increasing the power of the motor 100, the frequency of the axial reciprocating movement of the motor shaft 21 can be increased, thereby improving the cleaning effect of the electric toothbrush.

[0119] Combination Figure 4 and Figure 8 As shown, the front reset ring 50 includes a front outer ring 51, a front middle ring 52, and a front inner ring 53. The front outer ring 51 is circumferentially arranged around the outside of the front middle ring 52 and is connected and fixed to the housing 10. The front outer ring 51 and the front middle ring 52 are radially spaced apart. A radially extending front first elastic connecting arm 54 is connected between the front outer ring 51 and the front middle ring 52. The front middle ring 52 is circumferentially arranged around the outside of the front inner ring 53 and is radially spaced apart from the front inner ring 53. A radially extending front second elastic connecting arm 55 is connected between the front inner ring 53 and the front middle ring 52. The front inner ring 53 is sleeved on the motor shaft 21. The front elastic part includes at least a portion of the front middle ring 52, the front first elastic connecting arm 54, the front inner ring 53, and the front second elastic connecting arm 55.

[0120] Specifically, by circumferentially surrounding the outer front ring 51 with the outer front ring 52, the outer front ring 51 is fitted against the inner wall of the housing 10, and the front end of the wire frame 33 and the front end of the housing 10 can respectively abut against both ends of the outer front ring 51, thereby fixing the outer front ring 51 within the housing 10. Further, a radially extending first elastic connecting arm 54 is provided between the outer front ring 51 and the middle front ring 52. The middle front ring 52 is circumferentially surrounding the outer front ring 53, and a radially extending second elastic connecting arm 55 connects the inner front ring 53 and the middle front ring 52. The inner front ring 53 is fitted onto the motor shaft 21. The front elastic part includes the middle front ring 52 and the second elastic connecting arm 55. At least a portion of the elastic connecting arm 54, the front inner ring 53, and the front second elastic connecting arm 55, when the motor shaft 21 moves axially, will cause the front inner ring 53 to move axially and the front middle ring 52 to undergo elastic deformation due to the connection between the front inner ring 53 and the front middle ring 52 being only connected by the second elastic connecting arm 55. Based on this, the front middle ring 52 will also be adaptively driven to undergo elastic deformation by the front second elastic connecting arm 55. Furthermore, since the front middle ring 52 and the front outer ring 51 are connected only by the front first elastic connecting arm 54, the elastic deformation of the front middle ring 52 will also drive the front first elastic connecting arm 54 to undergo elastic deformation.

[0121] This invention, by configuring the front outer ring 51 within the housing 10, allows the front first elastic connecting arm 54, front middle ring 52, front second elastic connecting arm 55, and front inner ring 53 to undergo elastic deformation, thereby buffering the axial movement of the motor shaft 21. This configuration improves the buffering and shock absorption effect of the front reset ring 50 on the axial movement of the motor shaft 21, and enhances its auxiliary driving effect. Furthermore, it simplifies the structural design of the front reset ring 50, reduces its manufacturing cost, and allows for a more compact motor 100. Additionally, the front reset ring 50 is less prone to damage and has good reliability.

[0122] Combination Figure 4 and Figure 8 As shown, there are at least two front first elastic connecting arms 54 arranged opposite each other in the radial direction, and at least two front second elastic connecting arms 55 arranged opposite each other in the radial direction. The radial directions of the at least two front first elastic connecting arms 54 are perpendicular to the radial directions of the at least two front second elastic connecting arms 55.

[0123] Specifically, at least two front first elastic connecting arms 54 are provided, and the at least two front first elastic connecting arms 54 are arranged opposite each other in the radial direction. This makes the connection force between the front middle ring 52 and the front outer ring 51 more uniform, so that the whole is more stable when the front middle ring 52 and the front first elastic connecting arms 54 undergo elastic deformation.

[0124] Correspondingly, at least two front second elastic connecting arms 55 are provided, and the at least two front second elastic connecting arms 55 are arranged opposite each other in the radial direction. This makes the connection force between the front middle ring 52 and the front inner ring 53 more uniform, so that the whole is more stable when the front middle ring 52 and the front second elastic connecting arms 55 undergo elastic deformation.

[0125] Furthermore, the radial directions of at least two front first elastic connecting arms 54 are perpendicular to the radial directions of at least two front second elastic connecting arms 55. This makes the force on the front reset ring 50 more uniform, and the force can be evenly distributed to all directions of the front reset ring 50. This can prevent the front reset ring 50 from deforming severely in one direction while other directions do not deform or only deform slightly, causing local damage to the front reset ring 50. This can more comprehensively improve the structural reliability of the front reset ring 50.

[0126] Combination Figure 4 and Figure 7 As shown, the reset ring also includes a rear reset ring 60, which is disposed inside the housing 10 and has a rear elastic portion at least partially disposed in the middle. The rear elastic portion is sleeved on the motor shaft 21 to elastically deform when the second coil assembly 41 drives the motor shaft 21 to move axially.

[0127] Specifically, by placing the rear reset ring 60 inside the housing 10 and connecting and fixing the rear reset ring 60 to the housing 10, and by providing at least a rear elastic portion in the middle of the rear reset ring 60, and by sleeve the rear elastic portion onto the motor shaft 21, when the second coil assembly 41 drives the magnetic ring assembly 40 and the motor shaft 21 to reciprocate axially, the motor shaft 21 will cause the rear elastic portion of the rear reset ring 60 to undergo elastic deformation. In this way, on the one hand, the elastic deformation of the rear elastic portion can buffer and dampen the axial movement of the motor shaft 21, thereby improving the stability of the axial movement of the motor shaft 21; on the other hand, the elastic deformation of the rear elastic portion can also store energy for the axial reciprocating movement of the motor shaft 21, providing auxiliary driving force for the reciprocating movement of the motor shaft 21. Without increasing the power of the motor 100, the frequency of the axial reciprocating movement of the motor shaft 21 can be increased, thereby improving the cleaning effect of the electric toothbrush.

[0128] Furthermore, since the front reset ring 50 and the rear reset ring 60 are spaced apart axially on the motor shaft 21, and the front reset ring 50 and the rear reset ring 60 are located on opposite axial sides of the stator 30, and the front reset ring 50 is spaced apart on the side of the limiting member 22 axially away from the stator 30, when the motor 100 is impacted by an external force or falls from a height, the motor shaft 21 may move axially upward due to the external force. With the front reset ring 50 and the rear reset ring 60 buffering the motor shaft 21, the limiting member 22 will also move downward with the motor shaft 21 when the motor shaft 21 moves downward, and axially abut against the wire frame member 33 of the stator 30 for limiting, thus also buffering and preventing the axial movement of the motor shaft 21.

[0129] It should be noted that the contact limit between the limiting member 22 and the wire frame member 33 of the stator 30 is a hard contact. Compared with the elastic deformation buffer of the front reset ring 50 and the rear reset ring 60, the contact limit buffer between the limiting member 22 and the wire frame member 33 of the stator 30 has a greater buffering force. It can prevent the axial movement of the motor shaft 21 from causing damage to the front reset ring 50 and the rear reset ring 60, and prevent the motor shaft 21 from directly breaking through the housing 10 and causing overall damage, when the motor shaft 21 is subjected to a large external force impact. This is actually a safety fallback measure under extreme conditions, which can improve the structural safety of the motor 100 under extreme conditions.

[0130] When the motor 100 is working normally and the motor shaft 21 reciprocates axially under the drive of the second coil assembly 41, the driving force of the second coil assembly 41 is relatively stable. At this time, the elastic deformation of the front reset ring 50 and the rear reset ring 60 can achieve buffering and vibration reduction, as well as power storage and auxiliary drive. There is no need for the limit member 22 to abut against the wire frame member 33 for limiting. This can improve the stability of the axial reciprocating motion of the motor shaft 21 and also improve the user's experience of using the electric toothbrush.

[0131] Combination Figure 4 and Figure 7 As shown, the rear reset ring 60 includes a rear outer ring 61, a rear middle ring 62, and a rear inner ring 63. The rear outer ring 61 is circumferentially arranged around the outside of the rear middle ring 62 and is connected and fixed to the housing 10. The rear outer ring 61 and the rear middle ring 62 are radially spaced apart. A radially extending rear first elastic connecting arm 64 is connected between the rear outer ring 61 and the rear middle ring 62. The rear middle ring 62 is circumferentially arranged around the outside of the rear inner ring 63 and is radially spaced apart from the rear inner ring 63. A radially extending rear second elastic connecting arm 65 is connected between the rear inner ring 63 and the rear middle ring 62. The rear inner ring 63 is sleeved on the motor shaft 21. The rear elastic part includes at least a portion of the rear middle ring 62, the rear first elastic connecting arm 64, the rear inner ring 63, and the rear second elastic connecting arm 65.

[0132] Specifically, by circumferentially surrounding the outer rear ring 61 outside the middle rear ring 62, the outer rear ring 61 is fitted against the inner wall of the housing 10, and the rear end of the wire frame 33 and the rear end of the housing 10 can respectively abut against both ends of the outer rear ring 61, thereby fixing the outer rear ring 61 within the housing 10. Further, a radially extending rear first elastic connecting arm 64 is provided between the outer rear ring 61 and the middle rear ring 62. The middle rear ring 62 is circumferentially surrounding the outer rear ring 63, and a radially extending rear second elastic connecting arm 65 connects the inner rear ring 63 and the middle rear ring 62. The inner rear ring 63 is sleeved on the motor shaft 21. The rear elastic part includes the middle rear ring 62 and the second rear second elastic connecting arm 65. At least a portion of the elastic connecting arm 64, the rear inner ring 63, and the rear second elastic connecting arm 65, when the motor shaft 21 moves axially, will cause the rear inner ring 63 to move axially and the rear middle ring 62 to undergo elastic deformation due to the connection between the rear inner ring 63 and the rear middle ring 62 only through the rear second elastic connecting arm 65. Based on this, the rear middle ring 62 will also be adaptively driven to undergo elastic deformation by the rear second elastic connecting arm 65. Furthermore, since the rear middle ring 62 and the rear outer ring 61 are connected only by the rear first elastic connecting arm 64, the elastic deformation of the rear middle ring 62 will also drive the rear first elastic connecting arm 64 to undergo elastic deformation.

[0133] This invention, by configuring the rear outer ring 61 within the housing 10, allows the rear first elastic connecting arm 64, rear middle ring 62, rear second elastic connecting arm 65, and rear inner ring 63 to undergo elastic deformation, thereby buffering the axial movement of the motor shaft 21. This configuration improves the buffering and shock absorption effect of the rear reset ring 60 on the axial movement of the motor shaft 21, and enhances its auxiliary driving effect. Furthermore, it simplifies the structural design of the rear reset ring 60, reduces its manufacturing cost, and allows for a more compact motor 100. Additionally, the rear reset ring 60 is less prone to damage and exhibits good reliability.

[0134] Combination Figure 4 and Figure 7 As shown, there are at least two rear first elastic connecting arms 64 arranged opposite each other in the radial direction, and at least two rear second elastic connecting arms 65 arranged opposite each other in the radial direction. The radial directions of the at least two rear first elastic connecting arms 64 are perpendicular to the radial directions of the at least two rear second elastic connecting arms 65.

[0135] Specifically, at least two rear first elastic connecting arms 64 are provided, and the at least two rear first elastic connecting arms 64 are arranged opposite each other in the radial direction. This makes the connection force between the rear middle ring 62 and the rear outer ring 61 more uniform, so that the whole is more stable when the rear middle ring 62 and the rear first elastic connecting arms 64 undergo elastic deformation.

[0136] Correspondingly, at least two rear second elastic connecting arms 65 are provided, and the at least two rear second elastic connecting arms 65 are arranged opposite each other in the radial direction. This makes the connection force between the rear middle ring 62 and the rear inner ring 63 more uniform, so that the whole is more stable when the rear middle ring 62 and the rear second elastic connecting arms 65 undergo elastic deformation.

[0137] Furthermore, the radially opposite directions of at least two rear first elastic connecting arms 64 are set perpendicular to the radially opposite directions of at least two rear second elastic connecting arms 65. This makes the stress on the rear reset ring 60 more uniform, and the force can be evenly distributed to multiple directions of the rear reset ring 60. This can prevent the rear reset ring 60 from deforming severely in one direction while other directions do not deform or only deform slightly, causing uneven stress on the rear reset ring 60, erratic shaking of the motor shaft 21, or even local damage. This can more comprehensively improve the structural reliability of the rear reset ring 60.

[0138] In some embodiments of this utility model, the axial thickness of the first elastic connecting arm 54 is greater than the axial thickness of the second elastic connecting arm 55. Specifically, the two ends of the front second elastic connecting arm 55 are connected to the front middle ring 52 and the front inner ring 53, respectively. Since the front inner ring 53 needs to be able to drive the front middle ring 52 to deform elastically, the axial thickness of the front second elastic connecting arm 55 needs to be set to be relatively small. This makes the front second elastic connecting arm 55 easy to deform and easy to drive the front middle ring 52 to deform. Furthermore, since the two ends of the front first elastic connecting arm 54 are connected to the front outer ring 51 and the front middle ring 52, respectively, the front outer ring 51 is fixed in the housing 10 and the stability of the front outer ring 51 needs to be ensured in order to ensure the overall stability of the front reset ring 50 in the housing 10. Therefore, the axial thickness of the front first elastic connecting arm 54 needs to be set to be relatively large. This ensures that the front middle ring 52 can deform while also improving the stability of the front outer ring 51.

[0139] Correspondingly, the two ends of the second elastic connecting arm 65 are connected to the rear middle ring 62 and the rear inner ring 63, respectively. Since the rear inner ring 63 needs to be able to drive the rear middle ring 62 to deform elastically, the axial thickness of the second elastic connecting arm 65 needs to be set to be relatively small. This makes the second elastic connecting arm 65 easy to deform and easy to drive the rear middle ring 62 to deform. Furthermore, since the two ends of the first elastic connecting arm 64 are connected to the rear outer ring 61 and the rear middle ring 62, respectively, and the rear outer ring 61 is fixed in the housing 10, the stability of the rear outer ring 61 needs to be ensured to ensure the overall stability of the rear reset ring 60 in the housing 10. Therefore, the axial thickness of the first elastic connecting arm 64 needs to be set to be relatively large. This ensures that the rear middle ring 62 can deform while also improving the stability of the rear outer ring 61.

[0140] In some embodiments of this utility model, the axial thickness of the front outer ring 51 is greater than the axial thickness of the front middle ring 52. On the side of the front outer ring 51 along the length extension direction, the axial thickness of the front first elastic connecting arm 54 gradually increases. The axial thickness of the rear outer ring 61 is greater than the axial thickness of the rear middle ring 62. On the side of the rear outer ring 61 along the length extension direction, the axial thickness of the rear first elastic connecting arm 64 gradually increases.

[0141] In some embodiments of this utility model, both the front middle ring 52 and the rear middle ring 62 are sheet-like, meaning that the axial thickness of the front middle ring 52 and the rear middle ring 62 is relatively small. This makes the front middle ring 52 more prone to deformation and also allows the deformation force to be better transmitted to the front first elastic connecting arm 54, thereby enabling the front first elastic connecting arm 54 to also undergo corresponding deformation. This further enhances the buffering effect of the front reset ring 50 and the rear reset ring 60 on the axial movement of the motor shaft 21, and further enhances the axial auxiliary driving effect of the deformation of the front reset ring 50 and the rear reset ring 60 on the motor shaft 21.

[0142] It should be noted that the front outer ring 51 and the rear outer ring 61 have relatively large axial thicknesses. This makes the front outer ring 51 and the rear outer ring 61 less prone to deformation. When other parts of the front reset ring 50 and the rear reset ring 60 undergo elastic deformation, the front outer ring 51 and the rear outer ring 61 can still remain stable. This ensures the stability of the front reset ring 50 and the rear reset ring 60 and prevents the front reset ring 50 and the rear reset ring 60 from shifting their positions within the housing 10, which would cause the motor 100 to malfunction. This improves the structural reliability of the motor 100.

[0143] Furthermore, since the axial thickness of the outer front ring 51 is greater than that of the middle front ring 52, the axial thickness of the first elastic connecting arm 54 is gradually increased along its length extension direction. This results in a smaller thickness for the portion of the first elastic connecting arm 54 near the middle front ring 52 and a larger thickness for the portion near the outer front ring 51. This further enhances the deformation capability of the middle front ring 52 and prevents the thickness of the first elastic connecting arm 54 from hindering the elastic deformation of the middle front ring 52. At the same time, the first elastic connecting arm 54 can also increase the structural stability of the outer front ring 51. The ingenious design of the first elastic connecting arm 54 optimizes the structural design of the front reset ring 50.

[0144] Correspondingly, since the axial thickness of the outer rear ring 61 is greater than that of the middle rear ring 62, the axial thickness of the first elastic connecting arm 64 is gradually increased along its length extension direction. This results in a smaller thickness for the portion of the first elastic connecting arm 64 near the middle rear ring 62 and a larger thickness for the portion near the outer rear ring 61. This further enhances the deformation capability of the middle rear ring 62 and prevents the thickness of the first elastic connecting arm 64 from hindering the elastic deformation of the middle rear ring 62. At the same time, the first elastic connecting arm 64 can also increase the structural stability of the outer rear ring 61. The ingenious design of the first elastic connecting arm 64 can optimize the structural design of the rear reset ring 60.

[0145] In some embodiments of this utility model, the front middle ring 52 and the front second elastic connecting arm 55 have the same axial thickness, the rear middle ring 62 and the rear second elastic connecting arm 65 have the same axial thickness, the thickness of the end of the front first elastic connecting arm 54 connected to the front middle ring 52 is the same as the thickness of the front middle ring 52, the thickness of the end of the front first elastic connecting arm 54 connected to the front outer ring 51 is the same as the thickness of the front outer ring 51, the thickness of the end of the rear first elastic connecting arm 64 connected to the rear middle ring 62 is the same as the thickness of the rear middle ring 62, and the thickness of the end of the rear first elastic connecting arm 64 connected to the rear outer ring 61 is the same as the thickness of the rear outer ring 61.

[0146] Combination Figure 4 , Figure 7 and Figure 8 As shown, combined with Figure 1 As shown, the radially opposite directions of at least two front first elastic connecting arms 54 are the same as the radially opposite directions of at least two rear second elastic connecting arms 65, and the radially opposite directions of at least two front second elastic connecting arms 55 are the same as the radially opposite directions of at least two rear first elastic arms.

[0147] Specifically, since the front second elastic connecting arm 55 in the front reset ring 50 has a smaller thickness and weaker strength, while the rear first elastic connecting arm 64 in the rear reset ring 60 has a larger thickness and stronger strength, by making the radially opposite directions of at least two front second elastic connecting arms 55 the same as the radially opposite directions of at least two rear first elastic arms, the weaker part of the front reset ring 50 and the stronger part of the rear reset ring 60 can be axially aligned. In this way, when the motor shaft 21 reciprocates axially to drive the front reset ring 50 and the rear reset ring 60 to elastically deform simultaneously, the overall force on the front reset ring 50 and the rear reset ring 60 can be more balanced and uniform, which can improve the structural stability of the front reset ring 50 and the rear reset ring 60.

[0148] Correspondingly, since the thickness and strength of the second elastic connecting arm 65 in the rear reset ring 60 are smaller, while the thickness and strength of the first elastic connecting arm 54 in the front reset ring 50 are larger, by making the radially opposite directions of at least two first elastic connecting arms 54 the same as the radially opposite directions of at least two second elastic connecting arms 65, the weaker part of the front reset ring 50 and the stronger part of the rear reset ring 60 can be axially aligned. Thus, when the motor shaft 21 reciprocates axially to drive the front reset ring 50 and the rear reset ring 60 to elastically deform simultaneously, the overall force on the front reset ring 50 and the rear reset ring 60 can be more balanced and uniform, which can improve the structural stability of the front reset ring 50 and the rear reset ring 60 and enhance the buffering and vibration reduction effect of the front reset ring 50 and the rear reset ring 60 on the motor shaft 21.

[0149] Furthermore, the front reset ring 50 and the rear reset ring 60 are configured such that when the motor 100 encounters an external impact, the front reset ring 50 and the rear reset ring 60 can buffer the external force, reduce rigid collision losses, and at the same time better support and constrain the motor shaft 21 to prevent large-scale shaking.

[0150] In some specific embodiments of this utility model, there are two front first elastic connecting arms 54, which are arranged opposite each other in the radial direction; there are also two front second elastic connecting arms 55, which are arranged opposite each other in the radial direction.

[0151] Combination Figure 4 , Figure 7 and Figure 8As shown, a front locking part 531 is provided on the side of the front inner ring 53 axially away from the rear reset ring 60, and a front limiting step 532 is provided on the side of the front inner ring 53 axially close to the rear reset ring 60. A front bearing 56 is provided inside the front inner ring 53, which engages with the front locking part 531 and is limited by the front limiting step 532. The front bearing 56 is sleeved on the motor shaft 21, and the motor shaft 21 is rotatable relative to the front bearing 56. A rear locking part 631 is provided on the side of the rear inner ring 63 axially close to the front reset ring 50, and a rear limiting step 632 is provided on the side of the inner ring axially away from the front reset ring 50. A rear bearing 66 is provided inside the rear inner ring 63, which engages with the rear locking part 631 and is limited by the rear limiting step 632. The rear bearing 66 is sleeved on the motor shaft 21, and the motor shaft 21 is rotatable relative to the rear bearing 66.

[0152] Specifically, by placing the front bearing 56 in the front inner ring 53, and by limiting the axial ends of the front bearing 56 by the front limiting step 532 and the front snap-fit ​​part 531 in the front inner ring 53, the front bearing 56 is stably placed in the front inner ring 53. The front bearing 56 is then sleeved on the motor shaft 21, so that the front reset ring 50 is connected and fixed to the motor shaft 21 as a whole. The motor shaft 21 can rotate relative to the front bearing 56, thereby enabling the first coil assembly 31 to drive the motor shaft 21 to reciprocate in the circumferential direction.

[0153] Furthermore, the front limiting step 532 and the front locking part 531 not only ensure the limiting stability of the front inner ring 53 on the front bearing 56, but also have a simple structure and will not affect the elastic deformation of the front elastic second connecting arm and the front middle ring 52.

[0154] Correspondingly, by placing the rear bearing 66 in the rear inner ring 63, and by limiting the axial ends of the rear bearing 66 by the rear limiting step 632 and the rear snap-fit ​​part 631 in the rear inner ring 63, the rear bearing 66 is stably placed in the rear inner ring 63. The rear bearing 66 is then sleeved on the motor shaft 21, thereby allowing the rear reset ring 60 to be connected and fixed to the motor shaft 21 as a whole. The motor shaft 21 can rotate relative to the rear bearing 66, thereby enabling the first coil assembly 31 to drive the motor shaft 21 to reciprocate in the circumferential direction.

[0155] Furthermore, the rear limiting step 632 and the rear locking part 631 not only ensure the limiting stability of the rear inner ring 63 on the rear bearing 66, but also have a simple structure and will not affect the elastic deformation of the rear elastic second connecting arm and the rear middle ring 62.

[0156] It should be noted that after the front bearing 56 is installed, there is still a gap inside the front inner ring 53 that can be deformed and reset under force. In addition, multiple slots are provided on the end surface of the front inner ring 53, which can further improve the deformation capability of the front reset ring 50.

[0157] Correspondingly, after the rear bearing 66 is installed, there is still a gap inside the rear inner ring 63 that can be deformed and reset under force. In addition, multiple slots are provided on the end surface of the rear inner ring 63, which can further improve the deformation capability of the rear reset ring 60.

[0158] In addition, when the motor 100 is subjected to an external impact or falls from a height, the motor shaft 21 may also move axially upward due to the external force. With the front reset ring 50 and the rear reset ring 60 buffering the motor shaft 21, the front bearing 56 can axially abut and limit the front end of the housing 10, thereby also buffering and preventing the axial movement of the motor shaft 21.

[0159] It should be noted that the contact limit between the front bearing 56 and the front end of the housing 10 is a hard contact. Compared with the elastic deformation buffer of the front reset ring 50 and the rear reset ring 60, the contact limit buffer between the front bearing 56 and the front end of the housing 10 has a greater buffering force. It can prevent the axial movement of the motor shaft 21 from damaging the front reset ring 50 and the rear reset ring 60, and prevent the motor shaft 21 from directly breaking through the housing 10 and causing overall damage, when the motor shaft 21 is subjected to a large external force impact. This is actually a safety fallback measure under extreme conditions, which can improve the structural safety of the motor 100 under extreme conditions.

[0160] In some embodiments of this utility model, a front positioning bushing 25 is fitted onto the motor shaft 21. There are two front positioning bushings 25, each positioned at one end of the circumferential direction of the front bearing 56. The two front positioning bushings 25 abut against the axial ends of the front bearing 56, thus improving the stability and accuracy of the position of the front bearing 56 and the front return ring 50 on the motor shaft 21. It should be noted that when the motor 100 is subjected to external impact or falls from a height, the front of the front bearing 56 in one of the two front positioning bushings 25 abuts against the front end of the housing 10, providing a buffer and preventing axial movement of the motor shaft 21.

[0161] When the motor 100 is working normally and the motor shaft 21 reciprocates axially under the drive of the second coil assembly 41, the driving force of the second coil assembly 41 is relatively stable. At this time, the elastic deformation of the front reset ring 50 and the rear reset ring 60 can achieve buffering and vibration reduction, as well as power storage and auxiliary drive. There is no need for the limiting member 22 to abut against the wire frame member 33, or for the front bearing 56 to abut against the front end of the housing 10. This can further improve the stability of the axial reciprocating motion of the motor shaft 21 and also improve the user's experience of using the electric toothbrush.

[0162] Correspondingly, a rear positioning bushing 26 is fitted on the motor shaft 21. There are two rear positioning bushings 26, which are respectively set at the two circumferential ends of the rear bearing 66. The two rear positioning bushings 26 abut against the two axial ends of the rear bearing 66 for positioning. This can improve the stability and accuracy of the position of the rear bearing 66 and the rear reset ring 60 on the motor shaft 21.

[0163] The electric toothbrush according to this utility model mainly includes: the motor 100 mentioned above. Applying the motor 100 to the electric toothbrush can not only improve the cleaning effect of the electric toothbrush, but also improve the cleaning stability of the electric toothbrush, thereby improving the user experience.

[0164] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0165] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0166] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric motor, characterized in that, include: case; A rotor, the rotor being disposed within the housing and including a motor shaft, the motor shaft extending at least partially from the housing, and a limiting element being provided on the motor shaft; The stator is disposed within the housing and surrounds at least a portion of the rotor in the circumferential direction. The stator is provided with at least two stop portions, which are spaced apart. The stator is capable of driving the motor shaft to reciprocate in the circumferential direction at a preset angle. The limiting member is capable of alternately limiting and cooperating with the two stop portions. The stator also includes a magnetic field adjustment element, which is adapted to reset the rotor after the motor is powered off.

2. The motor according to claim 1, characterized in that, The magnetic field regulating element has a notch on one side facing the rotor. The rotor includes multiple magnetic components, which are circumferentially spaced on the motor shaft and include at least one N-pole magnetic component and at least one S-pole magnetic component. After the motor is powered off, the notch can balance the magnetic field, so that the spacing between the adjacent N-pole magnet and the S-pole magnet corresponds to the position of the notch, thereby resetting the rotor.

3. The motor according to claim 2, characterized in that, The stator includes a first coil assembly, which is disposed around the outer periphery of the rotor. The magnetic field adjustment element includes a main body, a through part, and a reset part. The main body is disposed around the outer periphery of the first coil assembly. The through part passes through the first coil assembly and its two ends are respectively connected to the main body and the reset part. The reset part is radially spaced from the rotor. The notch is disposed on the side of the reset part facing the rotor.

4. The motor according to claim 2, characterized in that, The plurality of magnetic components include two S-pole magnetic components and two N-pole magnetic components. In the circumferential direction of the motor shaft, the arrangement order of the two S-pole magnetic components and the two N-pole magnetic components is S-pole magnetic component, N-pole magnetic component, N-pole magnetic component and S-pole magnetic component.

5. The motor according to claim 2, characterized in that, The angular range of the rotor is the angular range formed by two adjacent stop portions; within the angular range of the rotor, the notch portion corresponds to a pair of adjacent N-pole magnets and S-pole magnets.

6. The motor according to any one of claims 1-5, characterized in that, The magnetic field regulating element is made of soft magnetic material.

7. The motor according to any one of claims 2-5, characterized in that, The magnetic field adjustment element is a hard magnetic material component. The reset part of the hard magnetic material component has an N' pole and an S' pole. After the motor is powered off, the N' pole and the S' pole are respectively located on both sides of the notch. The N' pole is disposed adjacent to the S pole, and the S' pole is disposed adjacent to the N pole.

8. The motor according to claim 3, characterized in that, The limiting member includes a fixing part and a rod part. The fixing part is sleeved on the motor shaft, and the rod part is connected to the fixing part and extends radially. The rod part is located between the two stop parts.

9. The motor according to claim 8, characterized in that, The first coil assembly includes a wire frame and a coil. The wire frame is circumferentially arranged around the outside of the rotor, and the coil is disposed on the wire frame. The wire frame is provided with the stop portion.

10. The motor according to any one of claims 1-5, characterized in that, It also includes a magnetic ring assembly and a second coil assembly. The magnetic ring assembly is sleeved on the outer periphery of the motor shaft. The second coil assembly is circumferentially arranged around the outside of the magnetic ring assembly and radially spaced from the magnetic ring assembly. The magnetic ring assembly has different magnetic poles alternately arranged in the axial direction, so that the second coil assembly can drive the magnetic ring assembly to drive the motor shaft to reciprocate in the axial direction.

11. The motor according to claim 10, characterized in that, It also includes a reset ring, which is disposed inside the housing and is partially elastically deformable. The reset ring is sleeved on the motor shaft so as to elastically deform when the second coil assembly drives the motor shaft to move axially, and to reset the motor shaft after the second coil assembly is de-energized.

12. The motor according to claim 11, characterized in that, The reset ring includes an outer ring, a middle ring, and an inner ring. The outer ring is circumferentially arranged around the outside of the middle ring and fixed to the housing. The outer ring and the middle ring are radially spaced apart. A radially extending first elastic connecting arm connects the outer ring and the middle ring. The middle ring is circumferentially arranged around the outside of the inner ring and radially spaced from the inner ring. A radially extending second elastic connecting arm connects the inner ring and the middle ring. The inner ring is sleeved on the bearing of the motor shaft.

13. The motor according to claim 12, characterized in that, The first elastic connecting arm is at least two and at least partially arranged opposite each other in the radial direction, and the second elastic connecting arm is at least two and at least partially arranged opposite each other in the radial direction.

14. The motor according to claim 13, characterized in that, There are two first elastic connecting arms arranged opposite each other in the radial direction, and there are two second elastic connecting arms arranged opposite each other in the radial direction; The radial direction of the first elastic connecting arm is different from that of the second elastic connecting arm.

15. The motor according to claim 14, characterized in that, The radial direction of the first elastic connecting arm is perpendicular to the radial direction of the second elastic connecting arm.

16. The motor according to claim 12, characterized in that, The axial thickness of the first elastic connecting arm is greater than the axial thickness of the second elastic connecting arm.

17. An electric toothbrush, comprising a handle and a brush head, characterized in that, Also includes: The motor according to any one of claims 1-16, wherein the motor is disposed within the handle, and the brush head is disposed on the motor shaft.

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