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CN-224218208-U - Motor and electric toothbrush

CN224218208UCN 224218208 UCN224218208 UCN 224218208UCN-224218208-U

Abstract

The utility model discloses a motor and an electric toothbrush, wherein the motor comprises a shell, a rotor, a stator and a magnetic field adjusting element, the rotor is arranged in the shell and comprises a motor shaft, a limiting piece is arranged on the motor shaft, the stator surrounds at least part of the circumference of the rotor, the stator is provided with at least two stop parts, the two stop parts are arranged at intervals, the stator can drive the motor shaft to reciprocate in the circumferential direction at a preset angle, the limiting piece can be in alternate limiting fit with the two stop parts, and the magnetic field adjusting element is suitable for resetting the rotor after the motor is powered off. Therefore, when the motor is electrified to enable the stator to selectively drive the motor shaft to reciprocally rotate at a preset angle, the motor shaft is alternately limited and matched with the two stop parts through the limiting piece, so that the reciprocating rotation control of the motor shaft is accurate, the rotor is driven to reset through the magnetic field adjusting element when the motor is powered off, a complex mechanical structure is not required to be arranged for resetting the rotor, mechanical loss is avoided, the cost of the motor can be reduced, and the volume of the motor is reduced.

Inventors

  • LI JUNHUI
  • WU LINGPENG

Assignees

  • 深圳迈入未来科技有限公司

Dates

Publication Date
20260508
Application Date
20250318

Claims (17)

  1. 1. An electric machine, comprising: A housing; The rotor is arranged in the shell and comprises a motor shaft, the motor shaft at least partially extends out of the shell, and a limiting piece is arranged on the motor shaft; the stator is arranged in the shell, the stator surrounds at least part of the circumference of the rotor, the stator is provided with at least two stop parts, at least two stop parts are arranged at intervals, the stator can drive the motor shaft to reciprocate in the circumferential direction at a preset angle, and the limiting piece can be in alternate limiting fit with the two stop parts; The stator further comprises a magnetic field adjusting element adapted to reset the rotor after power down of the motor.
  2. 2. The motor of claim 1, wherein a side of the magnetic field adjusting element facing the rotor is provided with a notch portion, the rotor includes a plurality of magnet pieces, the plurality of magnet pieces are circumferentially spaced on a motor shaft and include at least one N-pole magnet piece and at least one S-pole magnet piece; After the motor is powered off, the notch portion can balance a magnetic field, so that the interval area of the N pole magnet piece and the S pole magnet piece which are adjacent corresponds to the position of the notch portion, and the rotor is reset.
  3. 3. The motor according to claim 2, wherein the stator includes a first coil assembly, the first coil assembly is disposed around an outer peripheral side of the rotor, the magnetic field adjusting element includes a main body portion, a penetrating portion, and a resetting portion, the main body portion is disposed around an outer periphery of the first coil assembly, the penetrating portion penetrates the first coil assembly and has both ends respectively connected to the main body portion and the resetting portion, the resetting portion is disposed at an interval in a radial direction with the rotor, and the notch portion is disposed at a side of the resetting portion facing the rotor.
  4. 4. The motor of claim 2, wherein the plurality of magnet pieces includes two S-pole magnet pieces and two N-pole magnet pieces, and the two S-pole magnet pieces and the two N-pole magnet pieces are arranged in the order of S-pole magnet pieces, N-pole magnet pieces, and S-pole magnet pieces in the circumferential direction of the motor shaft.
  5. 5. The motor of claim 2, wherein the angular range of the rotor is an angular range formed by two adjacent stop portions, and wherein the notch portion corresponds to a pair of adjacent N-pole and S-pole magnet members in the angular range of the rotor.
  6. 6. An electric machine according to any one of claims 1-5, characterized in that the magnetic field adjusting element is a piece of soft magnetic material.
  7. 7. The electric machine of any one of claims 2-5, wherein the field adjusting element is a piece of hard magnetic material, the reset portion of the piece of hard magnetic material has an N ́ pole portion and an S ́ pole portion, the N ́ pole portion and the S ́ pole portion are located on either side of the gap portion, respectively, the N ́ pole portion is disposed adjacent to the S pole magnet piece, and the S ́ pole portion is disposed adjacent to the N pole magnet piece after the electric machine is de-energized.
  8. 8. A motor as claimed in claim 3, wherein the limiting member comprises a fixing portion and a rod portion, the fixing portion is sleeved on the motor shaft, the rod portion is connected with the fixing portion and extends in the radial direction, and the rod portion is located between the two stopping portions.
  9. 9. The electric machine of claim 8, wherein the first coil assembly comprises a bobbin and a coil, the bobbin being circumferentially disposed about an outer side of the rotor, the coil being disposed about the bobbin, the bobbin being provided with the stop.
  10. 10. The motor of any one of claims 1-5, further comprising a magnetic ring assembly and a second coil assembly, wherein the magnetic ring assembly is sleeved on the periphery of the motor shaft, the second coil assembly is circumferentially arranged on the outer side of the magnetic ring assembly in a surrounding manner and is radially spaced from the magnetic ring assembly, and the magnetic ring assembly is provided with 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. 11. The motor of claim 10, further comprising a reset ring disposed within the housing and partially elastically deformable, the reset ring being disposed about the motor shaft to elastically deform when the second coil assembly drives the motor shaft in axial movement and to reset the motor shaft after the second coil assembly is de-energized.
  12. 12. The motor of claim 11, wherein the reset ring comprises an outer ring, a middle ring and an inner ring, the outer ring is circumferentially arranged around the outer side of the middle ring and is fixed with the shell, the outer ring and the middle ring are radially arranged at intervals, and a first elastic connecting arm extending radially is connected between the outer ring and the middle ring; The middle ring circumferentially surrounds the outer side of the inner ring and is radially arranged at intervals with the inner ring, a second elastic connecting arm extending radially is connected between the inner ring and the middle ring, and the inner ring is sleeved on a bearing of the motor shaft.
  13. 13. The electric machine of claim 12, wherein the first resilient connecting arms are at least two and at least partially diametrically opposed, and the second resilient connecting arms are at least two and at least partially diametrically opposed.
  14. 14. The electric machine of claim 13, wherein the first resilient connecting arms are two and are disposed radially opposite and the second resilient connecting arms are two and are disposed radially opposite; The radial direction of the first elastic connecting arm is different from the radial direction of the second elastic connecting arm.
  15. 15. The motor of claim 14, wherein the radial direction of the first elastic connecting arm is perpendicular to the radial direction of the second elastic connecting arm.
  16. 16. The motor of claim 12, wherein the first resilient connecting arm shaft has an upward thickness that is greater than an upward thickness of the second resilient connecting arm shaft.
  17. 17. An electric toothbrush comprising a handle and a brush head, further comprising a motor as claimed in any one of claims 1 to 16, said motor being disposed within said handle, said brush head being disposed on said motor shaft.

Description

Motor and electric toothbrush Technical Field The utility model relates to the technical field of electric toothbrushes, in particular to a motor and an electric toothbrush. Background Along with the development of science and technology and the promotion of people's living standard, electric toothbrush is with its more laborsaving to the better characteristics to the cleaning effect of tooth are popularized in life gradually, wherein, electric toothbrush's motor's output shaft can carry out the circumference of great angle and rotate to and fro, thereby drives the brush head and carries out the reciprocal rotation of circumference, in order to clean user's tooth automatically. In prior art, the circumferential rotation of the output shaft of electric toothbrush's motor appears very easily and rotates unstably, rotates the circumstances of disorder, and the rotation control of the output shaft of motor is relatively poor, can reduce user's use like this and experience, can cause the injury to user's tooth even to after the motor outage, electric toothbrush needs to set up mechanical structure and control the rotor and reset, not only has mechanical loss, can make motor cost higher moreover, and can make the motor volume bigger. Disclosure of utility model The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present utility model is to propose a motor whose circumferential reciprocal rotation of the motor shaft is more stable and reliable and whose resetting is simpler. The utility model further provides an electric toothbrush. The motor comprises a shell, a rotor, a stator and a magnetic field adjusting element, wherein the rotor is arranged in the shell and comprises a motor shaft, the motor shaft at least partially extends out of the shell, a limiting piece is arranged on the motor shaft, the stator is arranged in the shell and surrounds at least part of the circumference of the rotor, the stator is provided with at least two stop parts, the two stop parts are arranged at intervals, the stator can drive the motor shaft to reciprocate in the circumferential direction at a preset angle, the limiting piece can be in alternate limiting fit with the two stop parts, and the magnetic field adjusting element is suitable for resetting the rotor after the motor is powered off. From this, when the motor circular telegram makes the stator drive motor shaft reciprocating rotation with predetermineeing the angle selectively, and the motor shaft is when rotating to the biggest angle, stop part can support the locating part, thereby carry out spacingly to the biggest angle of rotation of motor shaft, the reciprocal rotation control of motor shaft is comparatively accurate, the circumstances that can not appear the motor shaft and rotate the disorder, can promote the rotation stability of motor shaft, and reset through magnetic field adjusting element drive rotor when the motor outage, need not to set up complicated software algorithm, need not more to set up the circuit board on the motor, do benefit to reduce the volume of motor, and can reduce the volume of motor, and greatly reduced motor cost, can promote economic benefits widely. In some examples of the utility model, a notch is arranged on one side of the magnetic field adjusting element facing the rotor, the rotor comprises a plurality of magnet pieces, the plurality of magnet pieces are circumferentially arranged at intervals on a motor shaft and comprise at least one N-pole magnet piece and at least one S-pole magnet piece, after the motor is powered off, the notch can balance the magnetic field, and the spacing areas of the adjacent N-pole magnet pieces and the S-pole magnet pieces correspond to the positions of the notch, so that the rotor is reset. The motor shaft is provided with the N-pole magnet piece and the S-pole magnet piece at intervals, the notch can divide the magnetic field and interfere the magnetic field, after the motor is powered off, the N-pole magnet piece and the S-pole magnet piece on the motor shaft can be distributed on two sides of the notch relatively symmetrically, so that the magnetic field is balanced, and the balance of the notch to the magnetic field is utilized, so that the reset of the motor shaft is realized. In some examples of the present utility model, the stator includes a first coil assembly circumferentially disposed on an outer peripheral side of the rotor, the magnetic field adjusting element includes a main body portion circumferentially disposed on the outer periphery of the first coil assembly, a penetrating portion penetrating the first coil assembly and having both ends respectively connected to the main body portion and the resetting portion, the resetting portion being disposed at a radial interval from the rotor, and a notch portion disposed on a side of the resetting portion facing the rotor. So set up, main part and wearing to es