CN110266170B - Vibration motor of electric toothbrush - Google Patents
Vibration motor of electric toothbrush Download PDFInfo
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- CN110266170B CN110266170B CN201910648057.5A CN201910648057A CN110266170B CN 110266170 B CN110266170 B CN 110266170B CN 201910648057 A CN201910648057 A CN 201910648057A CN 110266170 B CN110266170 B CN 110266170B
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- 230000004888 barrier function Effects 0.000 claims description 6
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- 230000008569 process Effects 0.000 abstract description 5
- 230000005672 electromagnetic field Effects 0.000 description 11
- 230000009471 action Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
- A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
- A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
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- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Brushes (AREA)
Abstract
The invention discloses a vibrating motor of an electric toothbrush, which comprises an outer shell, a swinging shaft, a stator component and a rotor component; the stator component comprises a coil sleeved on the periphery of the swinging shaft and at least two sets of magnet groups which are circumferentially arranged on the periphery of the swinging shaft and fixed on the inner wall surface of the outer shell; the magnet groups comprise first magnets and second magnets, and the polarities of any adjacent first magnets and second magnets in the radial direction of the swinging shaft are opposite; the rotor component comprises a magnetizer fixed on the swinging shaft; the periphery of the magnetizer is provided with at least two boss structures protruding towards the direction of the outer shell; the boss structure comprises a first boss and a second boss which are separated by an arc-shaped groove in the middle. After the coil is powered off, the attraction force of the magnet group to the boss structure can drive the swing shaft to automatically return to the initial balance position, so that a torsion spring is not needed, the structure of the vibration motor is simplified, the torque consumed in the rotation process of the swing shaft is reduced, and the service life and the functional stability of the vibration motor are improved.
Description
Technical Field
The utility model relates to the technical field of vibration motors, in particular to a vibration motor of an electric toothbrush.
Background
With the continual improvement of consumer's living standard, electric toothbrushes are becoming the preferred tool for consumer's tooth care, and the structure of magnetic levitation motors used in electric toothbrushes or other oscillating electric tools is also being updated.
In the prior art, a vibration motor of an electric toothbrush mainly comprises a shell, a swinging shaft, a coil, two rotors, two groups of magnets and a torsion spring piece. The coil, the two rotors and the two groups of magnets are all positioned in the shell, the coil and the two rotors are all sleeved on the swinging shaft, and the two rotors are respectively positioned at two sides of the coil; the two groups of magnets are respectively fixed on the inner wall surface of the shell and respectively wound on the peripheries of the two rotors; the torsion spring piece is arranged between the end part of the swinging shaft and the shell, has required torsion deformation and is used for limiting the swinging of the swinging shaft. When the coil is electrified, the coil generates an electromagnetic field, and the acting force between the electromagnetic field and the fixed magnetic field of each group of magnets drives the rotor and the swinging shaft to swing by a required angle according to the principle of homopolar repulsion and heteropolar attraction, so that the toothbrush is driven to vibrate, and the torsion spring plate is twisted along with the swinging shaft; when the power supply to the coil is stopped, the swing shaft is reset to the initial position under the action of the torsion restoring force of the torsion elastic piece.
However, in the vibration motor having such a structure, the return of the oscillating shaft is mainly performed by the elastic return force of the torsion spring, and the torsion spring has a certain rigidity, and most of the torque of the oscillating shaft needs to be absorbed during the rotation of the oscillating shaft, so that the output power of the oscillating shaft is reduced. Secondly, the torsion spring piece has certain fatigue, and can fracture or deform the parts after long-time torsion, so that the service life and the functions of the whole vibration motor are affected.
Disclosure of utility model
Therefore, the technical problem to be solved by the utility model is to overcome the problem that the rotor component is difficult to restore to the balance position after the coil stops supplying power to the vibrating motor in the prior art, thereby providing the vibrating motor of the electric toothbrush.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
A vibration motor of an electric toothbrush, comprising:
An outer housing having an installation cavity;
The swinging shaft is arranged in the installation cavity, and one end of the swinging shaft extends out of the outer shell and is connected with a part driven by the outer shell;
The stator component comprises a coil sleeved on the periphery of the swinging shaft and at least two sets of magnet groups which are circumferentially and uniformly arranged on the periphery of the swinging shaft and fixed on the inner wall surface of the outer shell; each set of magnet group comprises a first magnet and a second magnet, and the polarities of any adjacent first magnet and second magnet in the radial direction of the swinging shaft are opposite;
A rotor member including a magnetizer fixed on the swing shaft and rotatably arranged at the center of at least two sets of magnet groups; the periphery of the magnetizer is provided with at least two boss structures which are protruded towards the direction of the outer shell and are uniformly distributed in the circumferential direction; the boss structure comprises a first boss and a second boss which are separated by an arc-shaped groove in the middle.
Further, the first boss and the second boss are provided with concave parts which are concave inwards at the connection parts of the first boss and the second boss and the magnetizer body.
Further, in the axial direction of the swing shaft, the lengths of the first magnet and the second magnet are both larger than the length of the magnetizer.
Further, the stator component further comprises a coil frame sleeved on the periphery of the swinging shaft, annular baffles are arranged at two ends of the coil frame, and the coil is sleeved on the coil frame, and two ends of the coil frame are respectively limited by the annular baffles.
Further, the outer shell comprises a first shell and a second shell which enclose a hollow cylindrical cavity with two open ends, and two end covers which are respectively arranged at the two ends of the first shell and the second shell to close the openings of the hollow cylindrical cavity, wherein the end covers and the corresponding annular baffle plates form a limit space of the magnet group in the axial direction of the swinging shaft.
Further, the end cover is provided with a plurality of limiting bosses which protrude towards the direction corresponding to the magnet group and are positioned between the adjacent boss structures to limit the rotating stroke of the magnetizer.
Further, the contact surface of the end cover and the magnet group is provided with a plurality of positioning grooves for embedding one end of the first magnet or one end of the second magnet so as to position the magnet group.
Further, a limiting piece is arranged on the contact surface of the annular baffle plate and the magnetizer, and a limiting end surface used for limiting the movement of the magnet group in the radial direction of the swinging shaft and a limiting flange used for limiting the rotation of the magnet group in the circumferential direction of the swinging shaft are arranged on the limiting piece.
Further, the rotor component further comprises an inner shaft sleeve sleeved on the periphery of the swinging shaft and an outer shaft sleeve sleeved on the periphery of the inner shaft sleeve and driven by the magnetizer to rotate, and the inner shaft sleeve and the outer shaft sleeve are magnetism increasing components.
Further, the outer shell is made of magnetic conductive materials.
The technical scheme of the utility model has the following advantages:
1. When the coil is in an electrified state, the magnetic induction lines of the electromagnetic field generated by the coil are concentrated on the magnetizer of the rotor component, so that the polarities of the boss structures on the magnetizer are the same (both are N poles or both are S poles); the polarities of the adjacent first magnet and second magnet in the same magnet group close to the inner end of the boss structure are opposite (one is N pole, the other is S pole), so that an attractive force and a repulsive force are generated on the boss structure, other magnet groups can generate an attractive force and a repulsive force on the corresponding boss structure in the same way, the directions of the attractive force and the repulsive force are the same, and the magnetizers are driven to rotate clockwise or anticlockwise, so that the swinging shaft is driven to rotate left and right, and the vibration function of the electric toothbrush is realized. Meanwhile, when the coil is in a non-electrified state, the polarity of the boss structure on the magnetizer gradually disappears, the first magnet and the second magnet in the same magnet group generate attractive force on the boss structure, and under the action of the attractive force, the magnetizer and the swinging shaft can automatically reset to the initial balance position, and compared with the prior art, the swinging shaft does not need to reset to the initial balance position by using a torsion spring, so that the structure of the vibrating motor is simplified; the simplified vibration motor can reduce the torque consumed by the torsion spring plate in the rotation process of the swinging shaft, and can reduce the current passing through the coil under the condition that the output power of the swinging shaft is fixed; on the other hand, the influence of the fracture or deformation of the torsion spring plate on the service life and the function of the vibration motor is overcome, so that the service life and the functional stability of the vibration motor are improved.
2. The first boss and the second boss of the boss structure are separated by the arc-shaped groove in the middle, the boss structure generates polarity under the attractive force action of the first magnet and the second magnet with different polarities, and the two magnetic poles of the boss structure are respectively concentrated on the first boss and the second boss, so that the first magnet generates an attractive force action on the first boss which is close to the boss, the second magnet generates an attractive force action on the second boss which is close to the boss, and only when the boss structure is positioned at the middle axis position of the corresponding first magnet and the second magnet, the resultant force direction of the two attractive forces is perpendicular to the axis direction of the magnetizer, the boss structure and the magnetizer can be in a stable state with balanced stress, and therefore, when the coil is in a non-electrified state, the magnetizer and the swinging shaft can automatically return to the initial balanced position under the action of the magnet group.
3. According to the vibration motor of the electric toothbrush, the limiting boss on the end cover can limit the rotating stroke of the magnetizer, and the phenomenon that the corresponding relation between the boss structure on the magnetizer and the magnet group is dislocated is avoided, so that the magnetizer and the swinging shaft can be further ensured to be automatically reset to the initial balance position in the state that the coil is not electrified.
4. According to the vibrating motor of the electric toothbrush, the limiting grooves on the end cover and the limiting pieces on the annular baffle plate play a role in limiting the magnet group, so that the position change of the magnet group can be reduced, and the balance position restored by the magnetizer and the swinging shaft cannot be changed.
5. When the coil is in an electrified state, electromagnetic fields generated by the coil are concentrated on the inner shaft sleeve and the outer shaft sleeve, the inner shaft sleeve and the outer shaft sleeve transmit the electromagnetic fields to two magnetizers at two ends in a concentrated mode, one magnetizer is an N pole, the other magnetizer is an S pole, the two magnetizers and the stator component rotate in a magnetic field reverse mode, and the rotor component and the swinging shaft can rotate more stably and more efficiently; meanwhile, the arrangement of the inner shaft sleeve not only can assist in transmitting an electromagnetic field, but also is convenient for the disassembly and replacement of the oscillating shaft, the oscillating shaft can be made of materials without magnetic conduction function, the oscillating shafts with different materials can be replaced conveniently as required, and the practicability of the vibrating motor is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an electric toothbrush vibration motor according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram showing an internal structure of an electric toothbrush vibration motor according to an embodiment of the present utility model, wherein an outer housing is hidden to show the internal structure;
FIG. 3 is an exploded view of an electric toothbrush vibration motor according to an embodiment of the present utility model;
FIG. 4 is a schematic longitudinal cross-sectional view of an electric toothbrush vibration motor according to a first embodiment of the present utility model;
FIG. 5 is a schematic view of a mounting structure of a magnet assembly and a magnetizer on a coil frame according to an embodiment of the present utility model;
FIG. 6 is a schematic view of an installation structure of a magnet assembly and a magnetizer on an end cover according to a first embodiment of the present utility model;
FIG. 7 is a state diagram of a stator member and a rotor member in an initial equilibrium position when not energized according to a first embodiment of the utility model;
FIG. 8 is a diagram showing the variation of the power supply voltage of the coil with time according to the first embodiment of the present utility model;
FIG. 9 is a schematic diagram of magnetic fields of a stator member and a rotor member when a power supply voltage of a coil is 3.7V according to an embodiment of the present utility model;
FIG. 10 is a schematic diagram of a magnetic field of a stator member and a rotor member when a power supply voltage of a coil is-3.7V according to an embodiment of the present utility model;
Fig. 11 is a schematic perspective view of a vibration motor of an electric toothbrush according to a second embodiment of the present utility model;
Fig. 12 is an exploded view of a vibration motor of an electric toothbrush according to a second embodiment of the present utility model.
Reference numerals illustrate: 1. an outer housing; 11. a first housing; 12. a second housing; 13. an end cap; 131. a limit boss; 132. a positioning groove; 2. a swing shaft; 3. a stator member; 31. a coil; 32. a coil former; 321. an annular baffle; 34. a magnet assembly; 341. a first magnet; 342. a second magnet; 35. a limiting piece; 351. a limiting end face; 352. a limit flange; 4. a rotor member; 41. a magnetizer; 411. a boss structure; 4111. a first boss; 4112. a second boss; 4113. an arc-shaped groove; 412. a recessed portion; 42. an outer sleeve; 43. an inner sleeve.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Example 1
An embodiment of the present utility model provides a vibration motor of an electric toothbrush, as shown in fig. 1 to 6, including an outer case 1, a swing shaft 2, a stator member 3, and a rotor member 4.
In the present embodiment, the outer housing 1 includes a first housing 11, a second housing 12, and two end caps 13. The first shell 11 and the second shell 12 are arranged along the axial direction of the swinging shaft 2, the first shell 11 and the second shell 12 are buckled and arranged to enclose a hollow cylindrical cavity with two open ends, and two end covers 13 are respectively arranged at two ends of the first shell 11 and the second shell 12 to close the openings of the hollow cylindrical cavity to form an installation cavity. The oscillating shaft 2 has at least one end extending through it and an end cap 13 connected to the part driven by it. Specifically, the two ends of the first shell 11 and the second shell 12 along the axial direction of the swinging shaft 2 are respectively provided with a lock head, the corresponding positions of the end covers 13 are provided with clamping grooves, and in the assembly process of the vibration motor, the lock heads on the first shell 11 and the second shell 12 respectively extend into the corresponding clamping grooves on the end covers 13, so that the first shell 11 and the second shell 12 can be assembled between the two end covers 13.
In the present embodiment, the stator member 3 includes a bobbin 32 fitted around the outer periphery of the oscillating shaft 2 and a coil 31 fitted around the bobbin 32, the bobbin 32 having a through hole through which the oscillating shaft 2 passes, the bobbin 32 further having annular barriers 321 at opposite ends of the bobbin 32 in the axial direction of the oscillating shaft 2 for blocking opposite sides of the coil 31, the coil 31 being restricted on the bobbin 32 between the two annular barriers 321. The stator member 3 further includes at least two sets of magnet groups 34 circumferentially uniformly provided on the outer periphery of the oscillating shaft 2 and fixed on the inner wall surface of the outer case 1, the at least two sets of magnet groups 34 being located outside the annular barrier 321 with respect to the coil 31. Specifically, in the present embodiment, the number of the magnet groups 34 is four, and each set of the magnet groups 34 includes the first magnet 341 and the second magnet 342, the first magnet 341 and the second magnet 342 are the same in size and shape, and the polarities of any adjacent first magnet 341 and second magnet 342 in the radial direction of the swing shaft 2 are opposite.
In the present embodiment, the rotor member 4 includes two magnetizers 41 fixed to the swing shaft 2, and the two magnetizers 41 are respectively located outside the two annular barriers 321 opposite to the coil 31 and rotatably provided at the centers of the four magnet sets 34. The outer periphery of the magnetizer 41 has four boss structures 411 protruding toward the direction of the outer housing 1 and uniformly spaced circumferentially. The four boss structures 411 are identical in shape and each include a first boss 4111 and a second boss 4112 separated by an arc-shaped slot 4113 in the middle. When the coil 31 is in the non-energized state, the first boss 4111 and the second boss 4112 are respectively acted by the magnetic attraction force of the first magnet 341 and the second magnet 342 of the same magnet group 34, so that the magnetizer 41 can be reset to the initial equilibrium position. The magnetic gap is provided between the boss structures 411 of the magnetizer 41 and the magnet groups 34 of the stator member 3, and the magnetic gap is the same between the four boss structures 411 and the corresponding magnet groups 34.
In the vibration motor provided by the embodiment of the utility model, referring to fig. 7-10, when the coil 31 is in the energized state, the magnetic induction lines of the electromagnetic field generated by the coil 31 are concentrated on the magnetizer 41 of the rotor member 4, so that the polarities of the boss structures 411 on the same magnetizer 41 are the same (both are N poles or both are S poles); the polarities of the first magnet 341 and the second magnet 342 in the same magnet group 34 near the inner end of the boss structure 411 are opposite (one is N-pole and the other is S-pole), so that an attractive force and a repulsive force are generated on the boss structure 411, and the other magnet groups 34 can generate an attractive force and a repulsive force on the corresponding boss structure 411 in the same way, and the directions of the attractive force and the repulsive force are the same, so that the magnetizer 41 is driven to rotate clockwise or anticlockwise, and the swinging shaft 2 is driven to rotate around the axial direction of the magnetizer, so that the vibration function of the electric toothbrush is realized. Meanwhile, after the coil 31 is stopped, the polarity of the boss structure 411 on the magnetizer 41 gradually disappears, and the first magnet 341 and the second magnet 342 in the same magnet group 34 both generate attractive force to the boss structure 411, and under the action of the attractive force, the magnetizer 41 and the swinging shaft 2 can be automatically reset to the initial balance positions. Compared with the prior art, the swing shaft 2 does not need to be reset to the initial balance position by using a torsion spring, so that the structure of the vibration motor is simplified; on the one hand, the simplified vibration motor can reduce the torque consumed by the torsion spring plate in the process of rotating along with the swinging shaft 2, and can reduce the current passing through the coil 31 under the condition that the output power of the swinging shaft 2 is fixed; on the other hand, the influence of the fracture or deformation of the torsion spring plate on the service life and the function of the vibration motor is overcome, so that the service life and the functional stability of the vibration motor are improved.
In this embodiment, the first boss 4111 and the second boss 4112 of the boss structure 411 are separated by the arc-shaped slot 4113 in the middle, the boss structure 411 generates polarity under the attractive force of the first magnet 341 and the second magnet 342 with different polarities, and the two magnetic poles of the boss structure 411 are respectively concentrated on the first boss 4111 and the second boss 4112, so that the first magnet 341 generates an attractive force on the first boss 4111 close to the second magnet 342, and the second magnet 342 generates an attractive force on the second boss 4112, and only when the boss structure 411 is located at the middle axis position of the corresponding first magnet 341 and second magnet 342, the resultant force directions of the two attractive forces are perpendicular to the axis direction of the magnetizer 41, the boss structure 411 and the magnetizer 41 can be in a stable state of stress balance, so that after the coil 31 stops being electrified, the magnetizer 41 and the swinging shaft 2 can automatically return to the initial balance position after being at rest under the action of the magnet group 34.
In the present embodiment, the connection portions of the first boss 4111 and the second boss 4112 with the body of the magnetizer 41 have concave portions 412 that are concave inward. When the coil 31 is not energized, the magnetic pole generated by the first boss 4111 under the magnetic force of the first magnet 341 is closer to the first boss 4111, and the magnetic pole generated by the second boss 4112 under the magnetic force of the second magnet 342 is closer to the second boss 4112, so that the attractive force between the first boss 4111 and the first magnet 341, and between the second boss 4112 and the second magnet 342 is greater, and the magnetizer 41 can automatically return to the initial equilibrium position after being stationary.
In a preferred implementation manner of this embodiment, in order to better maintain the stability of the installation position of the magnet assembly 34, a limiting space for limiting the magnet assembly 34 in the axial direction of the swinging shaft 2 is formed between the two end covers 13 and the annular baffle 321 of the corresponding coil former 32, and after the openings at both ends of the hollow cylindrical cavity are respectively closed by the end covers 13, the end covers 13 can perform a limiting function on the magnet assembly 34, so as to improve the stability of the magnet assembly 34.
In the present embodiment, the end cover 13 has two limiting bosses 131 protruding toward the direction corresponding to the magnet group 34 and located between the adjacent boss structures 411 to limit the rotational travel of the magnetizer 41, and the two limiting bosses 131 are oppositely disposed on the end surface of the end cover 13 near the magnet group 34. In some embodiments, the number of the limiting bosses 131 may be four and may be respectively disposed corresponding to the middle positions of the two boss structures 411 on the magnetizer 41. The two limiting bosses 131 on the end cover 13 can limit the rotation stroke of the magnetizer 41, and avoid the phenomenon that the corresponding relation between the boss structure 411 on the magnetizer 41 and the magnet group 34 is dislocated, thereby further ensuring that the magnetizer 41 and the swinging shaft 2 can be automatically reset to the initial balance position in the state that the coil 31 is stopped being electrified.
In the present embodiment, the contact surface between the end cover 13 and the magnet group 34 has eight positioning grooves 132 in which one end of the first magnet 341 or the second magnet 342 is embedded to position the magnet group 34, and the eight positioning grooves 132 are uniformly arranged in the circumferential direction. One end of the magnet group 34 is limited in the corresponding positioning groove 132, so that four magnet groups 34 are conveniently and uniformly arranged on the periphery of the swinging shaft 2 in the circumferential direction, and the influence of the offset of the installation positions of the magnet groups 34 and the first magnet 341 and the second magnet 342 on the performance of the vibration motor is reduced.
In this embodiment, in order to further improve the stability of the installation position of the magnet assembly 34, a limiting piece 35 protruding in the direction of the magnet assembly 34 is provided on the contact surface of the annular baffle 321 and the magnetizer 41, and a limiting end surface 351 for limiting the movement of the magnet assembly 34 in the radial direction of the swinging shaft 2 and a limiting flange 352 for limiting the rotation of the magnet assembly 34 in the circumferential direction of the swinging shaft 2 are provided on the limiting piece 35. The limiting piece 35 is arranged so that the balance position where the magnetizer 41 and the swinging shaft 2 return is not changed.
In this embodiment, the rotor member 4 further includes an inner sleeve 43 sleeved on the outer periphery of the swing shaft 2, and an outer sleeve 42 sleeved on the outer periphery of the inner sleeve 43 and driven to rotate by the magnetizer 41, where the inner sleeve 43 and the outer sleeve 42 are magnetism-increasing components. The fixing frame is sleeved outside the outer shaft sleeve 42, and two magnetizers 41 of the rotor mechanism are sleeved on the outer shaft sleeve 42 and separated from the coil 31 by the annular baffle 321. The magnetic induction lines of the electromagnetic field generated after the coil 31 is electrified are concentrated on the outer sleeve 42, the two ends of the outer sleeve 42 are respectively an S pole and an N pole, and the outer sleeve 42 transmits the electromagnetic field to the two magnetizers 41 in a concentrated mode, so that one magnetizer 41 is an S pole, the other magnetizer 41 is an N pole, the two magnetizers 41 and the stator component 3 perform magnetic field reverse rotation, and the rotor component 4 and the swinging shaft 2 can rotate more stably and more efficiently. Meanwhile, the arrangement of the inner shaft sleeve 43 not only can assist in transmitting an electromagnetic field, but also is convenient for the disassembly and replacement of the oscillating shaft 2, the oscillating shaft 2 can be made of materials without magnetic conduction, the oscillating shaft 2 with different materials can be replaced conveniently according to the needs, and the practicability of the vibrating motor is improved.
In the present embodiment, the lengths of the first magnet 341 and the second magnet 342 are the same and are both larger than the length of the magnetizer 41 in the axial direction of the swing shaft 2, so that the magnetizer 41 can be prevented from rotating in the radial direction of the swing shaft 2.
In this embodiment, the first housing 11 and the second housing 12 are made of magnetic conductive materials, and may be silicon steel sheets. The first shell 11 and the second shell 12 made of magnetic conductive materials can better concentrate magnetic induction wires of the coil 31 after being electrified on the two magnetic conductors 41 at two ends of the coil frame 32, and the current passing through the coil 31 is reduced under the condition that the output power of the swinging shaft 2 is constant.
The present utility model provides a vibration motor of an electric toothbrush, as shown in fig. 11-12, which is different from the first embodiment in that the cross section of the outer housing 1, the annular barrier 321 is a racetrack; only one end of the swinging shaft 2 extends out of the outer shell 1, and the other end is fixed on one end cover 13 through a bearing. The magnet groups 34 of the stator member 3 are only two groups and are symmetrically arranged at both ends of the oscillating shaft 2 and the radial direction; correspondingly, the magnetizer 41 of the rotor component 4 is also provided with only two boss structures 411 corresponding to the magnet groups 34 respectively.
Alternatively, the annular baffle 321 may not need to be provided with the limiting piece 35, or the limiting piece 35 is only used for limiting the axial rotation of the magnetizer 41 around the swinging shaft 2, and the limiting piece 35 may be integrally formed on the annular baffle 321 or welded and fixed on the annular baffle 321.
In summary, the working principle of the vibration motor of the electric toothbrush provided by the embodiment of the utility model is as follows:
When the coil 31 is in the energized state, the magnetic induction lines of the electromagnetic field generated by the coil 31 are concentrated on the magnetizer 41 of the rotor member 4, so that the polarities of the boss structures 411 on the same magnetizer 41 are the same (both are N poles or both are S poles); the polarities of the first magnet 341 and the second magnet 342 in the same magnet group 34 close to the inner end of the boss structure 411 are opposite (one is N-pole, the other is S-pole), so that an attractive force and a repulsive force are generated on the boss structure 411, and other magnet groups 34 can generate an attractive force and a repulsive force on the corresponding boss structure 411 in the same way, and the directions of the attractive force and the repulsive force are the same, so that the magnetizer 41 is driven to rotate clockwise or anticlockwise, and the swinging shaft 2 is driven to rotate around the axial direction of the magnetizer, so that the vibration function of the electric toothbrush is realized;
When the coil 31 is not energized, the polarity of the boss structure 411 on the magnetizer 41 gradually disappears, and the first magnet 341 and the second magnet 342 in the same magnet group 34 generate attractive force on the boss structure 411, so that the magnetizer 41 and the swinging shaft 2 can be automatically reset to the initial balance positions under the action of the attractive force.
Compared with the prior art, the swing shaft 2 does not need to be reset to the initial balance position by using a torsion spring, so that the structure of the vibration motor is simplified; on the one hand, the simplified vibration motor can reduce the torque consumed by the torsion spring plate in the process of rotating along with the swinging shaft 2, and can reduce the current passing through the coil 31 under the condition that the output power of the swinging shaft 2 is fixed; on the other hand, the influence of the fracture or deformation of the torsion spring plate on the service life and the function of the vibration motor is overcome, so that the service life and the functional stability of the vibration motor are improved.
The main utility model point of the embodiment of the utility model is that; the first boss 4111 and the second boss 4112 of the boss structure 411 are separated by the arc-shaped slot 4113 in the middle, the boss structure 411 generates polarity under the attractive force of the first magnet 341 and the second magnet 342 with different polarities, and the two magnetic poles of the boss structure 411 are respectively concentrated on the first boss 4111 and the second boss 4112, so that the first magnet 341 generates an attractive force on the first boss 4111 close to the first magnet, the second magnet 342 generates an attractive force on the second boss 4112 close to the second magnet, and the resultant force direction of the two attractive forces is perpendicular to the axial direction of the magnetizer 41 only when the boss structure 411 is located at the middle axial position of the corresponding first magnet 341 and second magnet 342, and the boss structure 411 and the magnetizer 41 can be in a stable state with balanced stress, so that when the coil 31 is in a non-energized state, the magnetizer 41 and the swinging shaft 2 can automatically return to an initial balanced position under the action of the magnet set 34.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (8)
1. A vibration motor of an electric toothbrush, comprising:
An outer housing (1) having an installation cavity;
The swinging shaft (2) is arranged in the installation cavity, and one end of the swinging shaft extends out of the outer shell (1) to be connected with a part driven by the outer shell;
A stator member (3) comprising a coil (31) sleeved on the outer periphery of the swinging shaft (2), and at least two sets of magnet groups (34) circumferentially and uniformly arranged on the outer periphery of the swinging shaft (2) and fixed on the inner wall surface of the outer shell (1); each set of the magnet groups (34) comprises a first magnet (341) and a second magnet (342), and the polarities of any adjacent first magnet (341) and second magnet (342) in the radial direction of the swinging shaft (2) are opposite;
A rotor member (4) including a magnetizer (41) fixed to the swing shaft (2) and rotatably provided at the center of at least two sets of the magnet groups (34); the periphery of the magnetizer (41) is provided with at least two boss structures (411) which are protruded towards the direction of the outer shell (1) and are uniformly distributed in the circumferential direction; the boss structure (411) comprises a first boss (4111) and a second boss (4112) which are separated by an arc-shaped groove (4113) in the middle;
The first boss (4111) and the second boss (4112) are provided with concave parts (412) which are concave inwards at the connection parts with the magnetizer (41) body;
The stator component (3) further comprises a coil frame (32) sleeved on the periphery of the swinging shaft (2), annular baffles (321) are arranged at two ends of the coil frame (32), and the coil (31) is sleeved on the coil frame (32) and two ends of the coil frame are limited by the annular baffles (321) respectively.
2. The vibration motor of an electric toothbrush according to claim 1, characterized in that the length of the first magnet (341) and the second magnet (342) is greater than the length of the magnetizer (41) in the axial direction of the oscillating shaft (2).
3. The vibration motor of an electric toothbrush according to claim 1, characterized in that the outer housing (1) includes a first housing (11) and a second housing (12) enclosing a hollow cylindrical cavity having both ends open, and two end caps (13) provided at both ends of the first housing (11) and the second housing (12) to close the opening of the hollow cylindrical cavity, respectively, the end caps (13) and the corresponding annular barriers (321) forming a limit space of the magnet group (34) in the axial direction of the oscillating shaft (2).
4. A vibrating motor of an electric toothbrush according to claim 3, characterized in that the end cap (13) has a number of limit bosses (131) thereon protruding in a direction corresponding to the magnet group (34) and located between adjacent boss structures (411) to limit the rotational travel of the magnetizer (41).
5. A vibrating motor of an electric toothbrush according to claim 3, characterized in that the contact surface of the end cover (13) and the magnet group (34) is provided with a plurality of positioning grooves (132) for embedding one end of the first magnet (341) or the second magnet (342) to position the magnet group (34).
6. The vibration motor of an electric toothbrush according to claim 1, characterized in that a limiting piece (35) is provided on a contact surface of the annular baffle plate (321) and the magnetizer (41), and a limiting end surface (351) for limiting the movement of the magnet group (34) in the radial direction of the swinging shaft (2) and a limiting flange (352) for limiting the rotation of the magnet group (34) in the circumferential direction of the swinging shaft (2) are provided on the limiting piece (35).
7. The vibration motor of an electric toothbrush according to claim 1, wherein the rotor member (4) further comprises an inner sleeve (43) sleeved on the outer periphery of the swinging shaft (2), and an outer sleeve (42) sleeved on the outer periphery of the inner sleeve (43) and driven to rotate by the magnetizer (41), and the inner sleeve (43) and the outer sleeve (42) are magnetism-increasing components.
8. A vibrating motor for an electric toothbrush according to claim 1, characterized in that the outer housing (1) is made of magnetically conductive material.
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| CN116098726A (en) * | 2021-11-11 | 2023-05-12 | 上海携福电器有限公司 | Cleaning nursing appliance |
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| CN102111032B (en) * | 2010-04-26 | 2012-12-05 | 王凤梅 | High-frequency vibration motor for electric toothbrush |
| CN107070308B (en) * | 2017-05-12 | 2024-04-05 | 温州伏尔特电子科技有限公司 | Magnetic suspension vibration motor |
| CN108667255A (en) * | 2018-06-05 | 2018-10-16 | 三椒口腔健康股份有限公司 | A kind of electric toothbrush vibrating motor |
| CN110001342B (en) * | 2019-04-15 | 2020-08-07 | 合肥工业大学 | Magnetorheological balance suspension with controllable transmission torque and control method thereof |
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Effective date of registration: 20200421 Address after: 325600 Intelligent Technology Industrial Park, Yueqing Economic Development Zone, Yueqing City, Wenzhou City, Zhejiang Province (within Zhejiang fulte Electric Appliance Co., Ltd.) Applicant after: Wenzhou fulte electromechanical Co.,Ltd. Address before: 325603, No. 508, white elephant Avenue, North white elephant Town, Wenzhou, Zhejiang, Yueqing Applicant before: WENZHOU FUERTE ELECTRONIC TECHNOLOGY Co.,Ltd. |
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