CN209844654U

CN209844654U - Sound wave motor for electric toothbrush

Info

Publication number: CN209844654U
Application number: CN201920918060.XU
Authority: CN
Inventors: 黄桂玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2019-12-24
Anticipated expiration: 2029-06-18

Abstract

The embodiment of the utility model discloses sound wave motor for electric toothbrush, including rotor and stator, the stator includes: the stator comprises a shell, a coil, an iron core, a conductive bar and a bearing, wherein the coil is wound on the iron core, the conductive bar is communicated with the coil, the conductive bar and the bearing are respectively arranged at two ends of the stator, an inner hole is formed in one end of the shell, the bearing is arranged in the inner hole, and the conductive bar is arranged at the other end of the shell; the rotor includes: the bearing is arranged at one end, away from the conductive bar, of the rotating shaft, the rotating shaft is sleeved at the axial center of the rotor support, and the magnet is at least partially arranged inside the rotor support in an embedded mode along the axial direction or the radial direction of the rotor support; the rotor bracket is arranged between the pair of iron cores. The embodiment of the utility model provides a need not install commutator and brush, through busbar and external power supply intercommunication, produce strong magnetic field, and the magnetic field interact who produces with the magnet of fixing at the rotor promotes the rotor and rotates, and the structure is more simple compact.

Description

Sound wave motor for electric toothbrush

Technical Field

The embodiment of the utility model provides a relate to electric toothbrush technical field, concretely relates to sound wave motor for electric toothbrush.

Background

Because the demand of tooth health care nursing improves day by day, in daily life, clean nursing device's use is increasing day by day, convenient electric toothbrush becomes consumer first choice, because the inside drive arrangement kind of electric toothbrush is different, it is comparatively practical the sound wave motor, at present, the sound wave toothbrush of magnetic suspension motor as the power supply, vibrate according to the frequency of setting for, the rotor does not do circular rotary motion, only rotate certain angle, do the beat motion repeatedly, drive the high-speed swing of toothbrush head, vibrations are strong and powerful, can solve the defect that general eccentric hammer vibrations motor torsion is little, with the better experience of giving the user.

However, in the existing magnetic suspension motor, the coil and the iron core are used as a rotor, the magnet is used as a stator, the rotor with the structure needs to be provided with a commutator, and the stator is provided with an electric brush, so that the structure is complex.

SUMMERY OF THE UTILITY MODEL

Therefore, the embodiment of the utility model provides an acoustic motor for electric toothbrush to solve among the prior art magnetic suspension motor and regard coil and iron core as the rotor, magnet is as the stator, and the rotor needs to have the commutator, is equipped with the brush on the stator, the comparatively complicated problem of structure.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

according to the embodiment of the utility model, a sound wave motor for electric toothbrush is provided, including rotor and stator, the stator includes: the stator comprises a shell, a coil, an iron core, a conductive bar and a bearing, wherein the coil is wound on the iron core, the conductive bar is communicated with the coil, and the conductive bar and the bearing are respectively arranged at two ends of the stator;

the rotor includes: the magnetic coupling comprises a magnet, a rotating shaft and a rotor support, wherein one end of the shell is provided with an inner hole, the bearing is installed in the inner hole, the conducting bar is arranged at the other end of the shell, the rotating shaft is sleeved at the axial center of the rotor support, and the magnet is at least partially arranged inside the rotor support in an embedded mode along the axial direction or the radial direction of the rotor support; the rotor bracket is arranged between the pair of iron cores.

The shell comprises a first accommodating part and a second accommodating part which are connected with each other, the first accommodating part and the second accommodating part are both cylindrical, and the inner diameter of the first accommodating part is smaller than that of the second accommodating part; the first containing part contains the bearing in an injection molding mode, and the second containing part contains the coil, the iron core and the conductive strip in an injection molding mode.

Further, the end cover is arranged at the end of the second accommodating part and used for blocking the second accommodating part.

Further, the magnet and the rotating shaft are fixed to the rotor bracket in a predetermined position through injection molding.

Further, the iron core includes first joint portion, second joint portion and wire winding portion, first joint portion with second joint portion set up respectively in wire winding portion length direction's both ends.

Furthermore, the first clamping portion is a crescent sheet or an arc sheet, wherein the surface of the first clamping portion facing the winding portion is a concave surface or a plane; the second joint portion is crescent or arc, wherein, second joint portion orientation the face of wire winding portion is convex surface or plane.

Further, the bearing is an oil bearing.

Further, a groove or a protrusion is provided at a corresponding outer surface of a center of the oiliness bearing in a length direction, and the groove or the protrusion is along a circumferential direction of the oiliness bearing.

Further, the depth of the groove or the thickness of the protrusion is 0.2-0.4 times of the wall thickness of the oil-retaining bearing.

Further, the housing further includes a support portion vertically disposed at an end of the second receiving portion, the support portion being in a flat plate shape, and a mounting hole is formed at a center thereof for directly supporting the rotor holder.

The embodiment of the utility model provides a have following advantage:

the embodiment of the utility model provides a regard magnet, rotation axis and rotor support as the rotor, with shell, busbar, bearing, coil and iron core as the stator, need not install commutator and brush, through busbar and external power supply intercommunication, produce the high-intensity magnetic field, and the magnetic field interact who fixes the magnet production at the rotor promotes the rotor and rotates, and the structure is more simple compact.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

FIG. 1 is a schematic diagram illustrating an acoustic wave motor according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating a core structure according to an exemplary embodiment;

fig. 3 is a schematic structural diagram of a core according to another exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a coil on a core according to an exemplary embodiment;

FIG. 5 is a schematic structural view of a bearing shown in accordance with an exemplary embodiment;

FIG. 6 is a side view schematic of a housing according to an exemplary embodiment;

fig. 7 is a schematic structural view of a core according to another exemplary embodiment;

FIG. 8 is a schematic diagram illustrating a coil on a core according to another exemplary embodiment;

in the figure: 10. a coil; 11. an iron core; 111. a first clamping part; 112. a second clamping part; 113. a winding part; 12. a conductive strip; 13. a bearing; 131. a groove; 132. a protrusion; 14. a magnet; 15. a rotor support; 16. a rotating shaft; 17. a housing; 171. a first accommodating portion; 172. a second accommodating portion; 173. a support portion; 174. mounting holes; 18. and (4) end covers.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

According to an embodiment of the present invention, there is provided a sound wave motor for an electric toothbrush, as shown in fig. 1, including a rotor and a stator, the stator includes: the stator comprises a shell 17, a coil 10, an iron core 11, a conductive strip 12 and a bearing 13, wherein the coil 10 is wound on the iron core 11, the conductive strip 12 is communicated with the coil 10, and the conductive strip 12 and the bearing 13 are respectively arranged at two ends of the stator;

the rotor includes: the permanent magnet synchronous motor comprises a magnet 14, a rotating shaft 16 and a rotor support 15, wherein one end of a shell 17 is provided with an inner hole, a bearing 13 is installed in the inner hole, a conductive bar 12 is arranged at the other end of the shell 17, the rotating shaft 16 is sleeved at the axial center of the rotor support 15, and the magnet 14 is at least partially embedded in the rotor support 15 along the axial direction or the radial direction of the rotor support 15; the rotor holder 15 is disposed between the pair of cores 11.

The embodiment of the utility model provides a regard magnet 14, rotation axis 16 and rotor support 15 as the rotor, with shell 17, busbar 12, bearing 13, coil 10 and iron core 11 as the stator, need not install commutator and brush, through busbar 12 and external power supply intercommunication, produce strong magnetic field, with the magnetic field interact who fixes magnet 14 production in the rotor, promote the rotor and rotate, the structure is more simple compact.

In some alternative embodiments, the rotating shaft 16 and the rotor support 15 are fixed by injection molding, and the surface of the rotating shaft 16 in contact with each other is provided with knurling or flat profile to increase the friction between the rotating shaft 16 and the rotor support 15, so that the two are fixed more firmly.

In some alternative embodiments, the rotor support 15 is formed between the magnet 14 and the rotating shaft 16 by injection molding, which makes the fixation between the magnet 14 and the rotating shaft 16 more firm, and makes the position of the magnet 14 more accurate and the fixation more firm, improves the acting force with the coil 10, and increases the torque of the output of the sound wave motor shaft, compared with the prior art in which the fixation is performed by glue bonding.

In some optional embodiments, the number of the magnets 14 may be one or more, and the magnets are arranged along the axial direction of the rotor support 15, and when the number is multiple, the position relationship between the plurality of magnets 14 and the iron core 11 and the coil 10 may be set according to the requirement of the resonant frequency, wherein how to specifically set the position relationship in the prior art is not relevant to the embodiments of the present invention, and is not described herein again.

In some optional embodiments, the device further comprises a housing 17, the housing 17 comprises a first accommodating part 171 and a second accommodating part 172 which are connected with each other, the first accommodating part 171 and the second accommodating part 172 are both cylindrical, and the inner diameter of the first accommodating part 171 is smaller than that of the second accommodating part 172; the first accommodating portion 171 accommodates the bearing 13 by injection molding, the second accommodating portion 172 accommodates the coil 10, the core 11 and the conductive bar 12 by injection molding, and the housing 17 is made of plastic, wherein the injection accommodating means that the bearing 13 is fixed inside the first accommodating portion 171 by injection molding, and the coil 10, the core 11 and the conductive bar 12 are fixed inside the second accommodating portion 172 by injection molding.

By providing the housing 17, the stator and rotor components can be accommodated and protected.

In some optional embodiments, an end cap 18 is further included, and the end cap 18 is disposed at an end of the second accommodating portion 172 for closing off the second accommodating portion 172. The side of the end cover 18 opposite to the second accommodating portion 172 is provided with a protrusion, wherein the diameter of the protrusion is smaller than that of the end cover 18, so that the end cover 18 is prevented from falling off. Of course, the end cover 18 may cover the end of the second accommodating portion 172, and the inner diameter of the end cover 18 is slightly larger than the outer diameter of the second accommodating portion 172. The tail end of the conductive strip 12 is communicated with an external power supply through a wire, wherein one or more through holes are formed in the end cover 18, the direction of each through hole is the same as the length direction of the second accommodating part 172, the through holes are used for the passing in and out of the wire, one end of the wire is communicated with the conductive strip 12, and the conductive strip 12 is connected with the external power supply through the wire to provide an energy source for the sound wave motor.

In some alternative embodiments, the magnet 14 and the rotating shaft 16 are fixed inside the rotor bracket 15 by injection molding at predetermined positions, that is, the magnet 14 and the rotating shaft 16 are fixed inside the rotor bracket 15 by injection molding at predetermined positions, where the predetermined positions are positions required for achieving a specified resonant frequency.

In some alternative embodiments, as shown in fig. 2, the iron core 11 includes a first clamping portion 111, a second clamping portion 112 and a winding portion 113, and the first clamping portion 111 and the second clamping portion 112 are respectively disposed at two ends of the winding portion 113 in a length direction.

By dividing the core 11 into three parts, the coil 10 is wound on the winding portion 113 between the first and second catching portions 111 and 112.

In some optional embodiments, the first clamping portion 111 is a crescent thin sheet or an arc thin sheet, wherein the surface of the first clamping portion 111 facing the winding portion 113 is a concave surface or a plane, as shown in fig. 2, the first clamping portion 111 is an arc thin sheet, and adopts a screw cap shape, and the surface facing the winding portion 113 is a plane, so that the winding area on the winding portion 113 is increased, which is beneficial to realizing automatic winding of a machine, improving the production efficiency, and meanwhile, the coils are arranged neatly, the number of turns of the coils is increased, and the magnetic induction intensity and the magnetic force are increased, thereby enhancing the torsion of the acoustic wave motor.

In some alternative embodiments, as shown in fig. 3, the first clamping portion 111 has a crescent shape, wherein the first clamping portion 111 is shortened based on the prior art, so that the winding area of the winding portion 113 is increased, as a result of winding, as shown in fig. 4, only a partial area of the winding portion 113 is a working area, i.e., an area without shielding in the winding range, wherein the area of the coil 10 is a rectangular area in fig. 4, and the winding area on the winding portion 113 can be increased by making both ends of the first clamping portion 111 in the length direction smaller.

In some alternative embodiments, as shown in fig. 7, the first clamping portion 111 is in a crescent shape, wherein the first clamping portion 111 is formed by adding a plane to the inner side of the first clamping portion 111 in an arc shape based on the prior art, so that the winding area of the winding portion 113 is increased, as shown in fig. 8, only a part of the winding area 113 is a working area, that is, an area without shielding in the winding area, wherein the area of the coil 10 is a rectangular area in fig. 8, and the winding area on the winding portion 113 can be increased by adding a plane to the first clamping portion 111 in an arc shape.

In some alternative embodiments, the bearing 13 is an oil bearing. The ball bearing is usually adopted in the prior art, in order to reduce cost, the oil bearing is adopted, the accuracy of the oil bearing is controllable, the product requirements are met, but the pressing and positioning of the oil bearing are not firm enough, and the performance, the service life and the reliability of the acoustic wave motor are influenced.

In some optional embodiments, a groove 131 or a protrusion 132 is formed on an outer surface corresponding to a center of the oil-containing bearing in the length direction, and the groove 131 or the protrusion 132 is arranged along a circumferential direction of the oil-containing bearing, as shown in fig. 5, the bearing 13 is directly placed into a stator injection molding mold cavity to be integrally injection-molded and fixed with the housing 17, and the bearing is pressed and fixed without additional external force, so that the situation that the performance of the acoustic wave motor is affected due to the fact that the oil-containing bearing is not strong enough and is deformed when the oil-containing bearing is excessively compressed is avoided, and the performance of the acoustic wave motor is also improved, meanwhile, the bearing 13 is more fastened, the position is accurate, the.

In some alternative embodiments, the depth of the groove 131 or the thickness of the protrusion 132 is 0.2-0.4 times the thickness of the oil-retaining bearing, in fig. 1, the groove 131 is a triangular groove, and the depth of the groove 131 refers to the maximum depth, in fig. 5, the protrusion 132 is rectangular, and by arranging and defining the size of the groove 131 or the protrusion 132, the bearing 13 can be well fixed, so that the bearing 13 is firmly fixed without deformation.

In some alternative embodiments, as shown in fig. 6, the housing 17 further includes a support portion 173, the support portion 173 is vertically disposed at an end of the second receiving portion 172, and the support portion 173 has a flat plate shape, and a mounting hole 174 is formed at the center thereof for directly supporting the rotor holder 15.

The supporting portion 173 is provided, and the rotor holder 15 is disposed in the mounting hole 174, so that the rotor holder 15 can be supported to rotate, and the supporting portion 173 can replace a bearing in the prior art for supporting, thereby reducing the cost.

The embodiment of the utility model provides a stator and rotor in all adopt injection moulding process to take shape, put magnet 14 in the die cavity, magnet 14's size, the convenient adjustment of position, iron core 11 also is put in the die cavity, iron core 11's size, the position is also all convenient to be adjusted, need not the die sinking again, only need adjust magnet 14 or iron core 11 place the position can, it is efficient to have, low cost's advantage, can make the adjustment according to the different resonant frequency that different customers needed, so as to conveniently satisfy different customer demands, and simultaneously, stator and rotor all adopt injection moulding, sound construction, promote motor life-span and reliability greatly.

Additionally, the embodiment of the utility model provides a metal casing that has removed sound wave motor among the prior art changes to plastic casing, can reduce cost on the one hand, reduces the casing cost, improves the packaging efficiency simultaneously, synchronous control bearing 13's position precision, iron core 11's position precision, the performance of adjustment and control sound wave motor, and in addition, this kind of structure can also be with iron core 11 and coil 10 an organic whole fixed, improves sound wave motor drop test's reliability greatly.

When in use, the rotating shaft 16 is connected with the electric toothbrush handle, and the toothbrush head can be driven to work through the toothbrush handle.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. An acoustic motor for an electric toothbrush comprising a rotor and a stator, wherein the stator comprises: the stator comprises a shell, a coil, an iron core, a conductive bar and a bearing, wherein the coil is wound on the iron core, the conductive bar is communicated with the coil, and the conductive bar and the bearing are respectively arranged at two ends of the stator;

2. The sonic motor of claim 1, further comprising a housing including a first receiving portion and a second receiving portion connected to each other, the first receiving portion and the second receiving portion each having a cylindrical shape, the first receiving portion having an inner diameter smaller than that of the second receiving portion; the first containing part contains the bearing in an injection molding mode, and the second containing part contains the coil, the iron core and the conductive strip in an injection molding mode.

3. The sonic motor of claim 2 further comprising an end cap disposed at an end of the second receiving portion for closing the second receiving portion.

4. The sonic motor of claim 1 wherein the magnet and the rotating shaft are injection molded to the rotor bracket at predetermined locations.

5. The acoustic motor for an electric toothbrush according to claim 1, wherein the iron core includes a first engaging portion, a second engaging portion and a winding portion, and the first engaging portion and the second engaging portion are respectively disposed at two ends of the winding portion in a length direction.

6. The sonic motor for electric toothbrush according to claim 5, wherein the first clamping portion is crescent-shaped or arc-shaped, wherein the surface of the first clamping portion facing the winding portion is concave or flat; the second joint portion is crescent or arc, wherein, second joint portion orientation the face of wire winding portion is convex surface or plane.

7. The sonic motor of claim 1 wherein the bearing is an oil bearing.

8. The sonic motor of claim 7 wherein the oil-containing bearing has a groove or a protrusion at a corresponding outer surface of a lengthwise center thereof, the groove or the protrusion being along a circumferential direction of the oil-containing bearing.

9. The sonic motor of claim 8 wherein the depth of the grooves or the thickness of the protrusions is 0.2 to 0.4 times the wall thickness of the oil bearing.

10. The sonic motor of claim 2, wherein the housing further comprises a support part vertically provided at an end of the second receiving part, the support part having a flat plate shape with a mounting hole formed at a center thereof for directly supporting the rotator bracket.