CN110601434A - Electric machine - Google Patents
Electric machine Download PDFInfo
- Publication number
- CN110601434A CN110601434A CN201910913947.4A CN201910913947A CN110601434A CN 110601434 A CN110601434 A CN 110601434A CN 201910913947 A CN201910913947 A CN 201910913947A CN 110601434 A CN110601434 A CN 110601434A
- Authority
- CN
- China
- Prior art keywords
- shaft
- shaft part
- elastic
- elastic body
- shaft portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims description 48
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 2
- 229910001004 magnetic alloy Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
Abstract
The invention relates to a motor, which comprises a stator component and a rotor component matched with the stator component; the rotor assembly comprises a rotating shaft and an elastic piece; the rotating shaft comprises a first shaft part and a second shaft part, wherein the first shaft part is arranged in the stator component in a penetrating mode, and the second shaft part is arranged at one end of the first shaft part and driven to rotate by the first shaft part; the elastic piece is arranged between the first shaft part and the second shaft part so as to transmit the torque generated by the first shaft part to the second shaft part and generate resilience force to drive the second shaft part to rotate. This motor is through setting up the elastic component between the first axial region and the second axial region of this pivot to with this elastic component with this first axial region and this second axial region be connected, transmit the moment of torsion that first axial region produced to second axial region, and produce the resilience force and drive this second axial region and rotate, and then can make second axial region high frequency rotate, and then can improve the result of use and the clean effect that adopt this motor drive's electric toothbrush.
Description
Technical Field
The present invention relates to a driving apparatus, and more particularly, to a motor.
Background
The related art electric machines generally include a stator assembly and a rotor assembly; this rotor subassembly includes the pivot, and this pivot is the axle of a rectangular shape, and it wears to locate this stator module, and this pivot although can rotate, but it is lower because of lacking the resilience force, and frequency of vibration is especially when the pivot lock is dead, and the rotor core of this motor also follows the card and dies the motor of burning out, and the result of use and the clean effect of the electric toothbrush who adopts this drive arrangement are not good, and life is short.
Disclosure of Invention
The invention aims to provide an improved motor.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing an electric machine comprising a stator assembly and a rotor assembly cooperating with the stator assembly; the rotor assembly comprises a rotating shaft and an elastic piece; the rotating shaft comprises a first shaft part and a second shaft part, wherein the first shaft part is arranged in the stator component in a penetrating mode, and the second shaft part is arranged at one end of the first shaft part and driven to rotate by the first shaft part; the elastic piece is arranged between the first shaft part and the second shaft part so as to transmit the torque generated by the first shaft part to the second shaft part and generate resilience force to drive the second shaft part to rotate.
Preferably, the elastic member is fixedly connected with the first shaft portion and the second shaft portion, or the elastic member is detachably connected with the first shaft portion and the second shaft portion.
Preferably, a first clamping groove is formed in an end portion, opposite to the second shaft portion, of the first shaft portion, so that one end of the elastic piece can be clamped in;
and a second clamping groove is formed in the end part, opposite to the first shaft part, of the second shaft part, so that the other end of the elastic part can be clamped in.
Preferably, the elastic member includes a first elastic body connected to the first shaft portion and the second shaft portion.
Preferably, the first elastic body is sheet-shaped.
Preferably, the elastic member further includes a second elastic body disposed at one end of the first elastic body connected to the second shaft portion and forming a U-shaped structure with the first elastic body.
Preferably, the motor further comprises a casing, an end cover arranged at one end of the casing and a shell arranged at one end of the end cover far away from the casing; the second shaft part penetrates out of the end cover;
the second elastic main body is L-shaped, and one side of the second elastic main body, which is opposite to the first elastic main body, is abutted against the inner side wall of the shell.
Preferably, the stator assembly includes a stator core and at least two coil windings wound on the stator core.
Preferably, the stator assembly further comprises a winding bracket arranged in the stator core and used for winding the at least two coil windings;
the stator core comprises a first splicing part and a second splicing part which is spliced with the first splicing part;
the winding support comprises a first winding portion and a second winding portion, wherein the first winding portion is arranged in the first splicing portion in a penetrating mode, the second winding portion is arranged in the second splicing portion in a penetrating mode and is spliced with the first winding portion.
Preferably, the rotor assembly further comprises a rotor core arranged in the stator core in a penetrating manner, and at least one pair of magnetic steels arranged on the rotor core;
the first shaft portion penetrates through the rotor core.
The motor of the invention has the following beneficial effects: this motor is through setting up the elastic component between the first axial region and the second axial region of this pivot to with this elastic component with this first axial region and this second axial region be connected, transmit the moment of torsion that first axial region produced to second axial region, and produce the resilience force and drive this second axial region and rotate, and then can make second axial region high frequency rotate, and then can improve the result of use and clean effect and the life that adopt this motor drive's electric toothbrush.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is an exploded schematic view of a first embodiment of the motor of the present invention;
FIG. 2 is an exploded schematic view of a second embodiment of the motor of the present invention;
fig. 3 is an exploded view of a third embodiment of the motor of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 shows a first embodiment of the motor of the invention. The motor can be used for an electric toothbrush, can be arranged in a handle of the electric toothbrush, can be connected with a toothbrush head of the electric toothbrush, and can be used for driving the toothbrush head of the electric toothbrush to vibrate at high frequency, so that the using effect and the cleaning effect of the electric toothbrush can be improved.
Further, as shown in fig. 1, the motor may include a stator assembly 10 and a rotor assembly 20; the stator assembly 10 can generate electromagnetic force to drive the rotor assembly 20 to rotate in the power-on state. The rotor assembly 20 can cooperate with the stator assembly 10 to rotate the head of the electric toothbrush.
Further, in the present embodiment, the stator assembly 10 may include a stator core 11, at least two coil windings 12, a winding bracket 13; the stator core 11 may be in a hollow structure, and the at least two coil windings 12 may include two or more coil windings 12. The winding frame 13 is disposed through the stator core 11, and is used for winding the coil winding 12. It will be appreciated that in other embodiments, the wire wound support 13 may be omitted.
The stator core 11 may be punched from a hot rolled or cold rolled silicon steel sheet or an iron-nickel soft magnetic alloy sheet. Of course, it is understood that in other embodiments, the material of the stator core 11 is not limited to silicon steel or iron-nickel soft magnetic alloy. The stator core 11 may include a first splice 111 and a second splice 112; the first splicing portion 111 and the second splicing portion 112 can be spliced to form a cylindrical structure. The first splicing portion 111 can be provided with internal teeth protruding towards the first splicing portion 111; the second splicing portion 112 may have internal teeth protruding toward the second splicing portion 112, and the internal teeth of the first splicing portion 111 and the second splicing portion 112 may be used for the at least two coil windings 12 to wind around.
Further, in the present embodiment, it may include two sets of coil windings 12, and each set of coil windings 12 may include two coil windings 12. Two coil windings 12 of one set may be disposed side by side on the first splicing portion 111, and they are respectively sleeved on the internal teeth of the first splicing portion 111 and separated by the winding frame 13. Another set of two coil windings 12 may be disposed side by side on the second splicing portion 112, and they may be respectively sleeved on the internal teeth of the second splicing portion 112 and separated by the winding frame 13.
Further, in the present embodiment, the winding frame 13 may be a hollow structure, and the length thereof may be greater than the length of the stator core 11, and the radial dimension thereof may be smaller than the radial dimension of the stator core 11. The winding bracket 13 may be an insulating bracket, and may include a first winding portion 131 and a second winding portion 132 spliced with the first winding portion 131, where the first winding portion 131 may be disposed in the first splicing portion 111, and may be disposed between the two coil windings 12 located in the first splicing portion 111. The second winding portion 132 can be spliced with the first winding portion 131 to form a cylindrical structure, which can be inserted into the second splicing portion 112 and can be disposed between the two coil windings 12 located in the second splicing portion 112.
Further, in the present embodiment, the rotor assembly 20 may include a rotating shaft 21, an elastic member 22, a rotor core 23, and at least one pair of magnetic steels 24; the rotating shaft 21 can be disposed in the stator assembly 10, specifically, the rotating shaft 21 can include a first shaft portion 211 and a second shaft portion 212, the first shaft portion 211 can penetrate into the rotor core 23 and penetrate into the winding bracket 13 after being combined with the rotor core 23, the first shaft portion 211 can rotate in cooperation with the stator assembly 12 in an energized state of the stator assembly 12, the second shaft portion 212 can be disposed at one end of the first shaft portion 211, and one end of the second shaft portion 212 away from the first shaft portion can be used for being connected with a toothbrush head of an electric toothbrush. This elastic component 22 can set up between this first axle portion 211 and this second axle portion 212, it can be connected with this first axle portion 211 and this second axle portion 212 respectively, it can increase motor body current, through producing the resilience force, increase output torsion, drive this second axle portion 212 and rotate, and then make this electric toothbrush's toothbrush head produce high-frequency vibration, especially when first axle portion 211 locks, it can avoid the card to die to burn out the motor, because elastic component 22 links to each other, this first axle portion 211 can continue to make a round trip to rotate, provide stronger power to this second axle portion 212 even. The at least one pair of magnetic steels 24 may be disposed on the rotor core 23, which may include one or more pairs of magnetic steels 24.
Further, in the present embodiment, the elastic member 22 may be a metal sheet, which is detachably connected to the first shaft portion 211 and the second shaft portion 212, and it is understood that in other embodiments, it may be fixedly connected to the first shaft portion 211 and the second shaft portion 212. In this embodiment, specifically, the end of the first shaft portion 211 opposite to the second shaft portion 212 may be opened with a first locking slot 2111, the end of the second shaft portion 212 opposite to the first shaft portion 211 may be opened with a second locking slot 2121, and the elastic element 22 may include a first elastic body 221; the first elastic body may be a longitudinal sheet, one end of which may be clamped into the first clamping groove 2111 and the other end of which may be clamped into the second clamping groove 2121, so as to be connected to the first shaft 211 and the second shaft 212, and the elastic sheet 22 may transmit the torque generated by the first shaft 211 to the second shaft and may generate elastic deformation to generate a resilient force to drive the second shaft 212 to rotate at a high frequency. It will be appreciated that in other embodiments, the first resilient body may not be limited to being in the form of an elongated sheet, which may be S-shaped, V-shaped, circular, or other shape.
Further, in this embodiment, the outer side wall of the rotor core 23 can be provided with a plurality of mounting grooves, the mounting grooves can be used for mounting the magnetic steel 24, the number of the mounting grooves is equivalent to that of the magnetic steel 24, and the mounting grooves and the magnetic steel 24 are arranged in a one-to-one correspondence manner. The length of the device iron core 23 is matched with the length of the stator iron core 11, the device iron core can be arranged in the stator iron core 11 in a penetrating mode, and the device iron core can vibrate in a matching mode with the stator iron core 11 in a power-on state, so that the rotating shaft 21 can be driven to rotate, and power output is achieved.
Further, in the present embodiment, the at least one pair of magnetic steels 24 may include two pairs of magnetic steels 24, and each pair of magnetic steels 24 includes two magnetic steels disposed in the mounting slots disposed on two opposite sides of the rotor core 23. The two pairs of magnets 24 may be arranged side by side.
Further, in the present embodiment, the motor may further include a bearing assembly 30; the bearing assembly 30 may include three bearings; the three bearings may be disposed in the winding frame 13 at intervals, two of the bearings may be sleeved on two ends of the first shaft 211, and the other bearing may be sleeved on one end of the second shaft 212 opposite to the first shaft 211, which is convenient for the rotation of the rotating shaft 21.
Fig. 2 shows a second exemplary embodiment of the electrical machine according to the invention, which differs from the first exemplary embodiment in that the winding carrier 13 can be omitted, the coil windings 12 can be two, they can penetrate into the stator core 11 and they can be arranged opposite one another. The motor may also include a housing 40, an end cap 50, and a housing 60, an insulating end piece 70.
Further, in the present embodiment, the housing 40 may be a hollow structure, which may be a hollow cylinder, and the inside of the hollow cylinder may form an accommodating space, and the shape of the hollow cylinder may be a rectangular parallelepiped. It is understood that in other embodiments, the shape of the housing 40 may not be limited to a rectangular parallelepiped shape. The housing 40 may be made of insulating metal, plastic, etc.
Further, in the present embodiment, the end cover 50 may be disposed at one end of the casing 40, which may be a hollow structure, and the first shaft portion 211 may penetrate into the stator core 20 from the end cover 50. The end cap 211 may be detachably connected to the housing 50, in particular it may be fixed by interference fit.
Further, in the present embodiment, the housing 60 may be disposed at an end of the end cover 50 away from the casing 40, which may be an intermediate structure, and may include a first housing 61, and a second housing 62; the first case 61 and the second case 62 may be spliced to each other. The resilient member 22 may be disposed in the housing 60.
In this embodiment, the elastic member 22 may further include a second elastic body 222; the second elastic body 222 may be disposed at an end of the first elastic body 221 connected to the second shaft portion 212, and may form a U-shaped structure with the first elastic body 221. The second elastic main body 222 may be L-shaped, and one side of the second elastic main body opposite to the first elastic main body 221 may be abutted against the side wall of the housing 60, so that the resilience of the second elastic main body 22 can be enhanced, thereby increasing the rotation frequency of the second shaft portion 212.
Further, in this embodiment, the number of the insulating end pieces 70 may be two, which may be respectively disposed at both ends of the stator core 11, may play a role in preventing leakage between the coil winding 12 and the stator core 11, and may be used to support the coil winding 12. It will be appreciated that in other embodiments, the insulating end piece 70 may be omitted.
Fig. 3 shows a third embodiment of the motor of the present invention, which is different from the second embodiment in that the second elastic body 222 may be omitted, and the width of the end of the first elastic body 221 connected to the second shaft portion 212 is greater than that of the end of the first elastic body 221 connected to the first shaft portion 211. The at least one pair of magnets 24 may include a pair of magnets, and the pair of magnets 24 may include two magnets 24; the two magnetic steels 24 may be disposed on two opposite sides of the rotor core 23.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. An electric machine comprising a stator assembly (10) and a rotor assembly (20) cooperating with the stator assembly (10); characterized in that the rotor assembly (20) comprises a rotating shaft (21) and an elastic member (22); the rotating shaft (21) comprises a first shaft part (211) penetrating through the stator assembly (10) and a second shaft part (212) arranged at one end of the first shaft part (211) and driven by the first shaft part (211) to rotate; the elastic piece (22) is arranged between the first shaft part (211) and the second shaft part (212) to transmit the torque generated by the first shaft part (211) to the second shaft part (212) and generate resilience force to drive the second shaft part (212) to rotate.
2. The electrical machine according to claim 1, wherein the resilient member (22) is fixedly connected to the first shaft portion (211) and the second shaft portion (212) or the resilient member (22) is detachably connected to the first shaft portion (211) and the second shaft portion (212).
3. The motor according to claim 1, wherein a first clamping groove (2111) is formed in an end portion of the first shaft portion (211) opposite to the second shaft portion (212) for clamping one end of the elastic member (22);
and a second clamping groove (2121) is formed in the end part, opposite to the first shaft part (211), of the second shaft part (212) so as to allow the other end of the elastic part (22) to be clamped in.
4. The electric machine according to claim 1, characterized in that the elastic member (22) comprises a first elastic body (221) connected with the first shaft part (211) and the second shaft part (212).
5. The machine according to claim 4, characterized in that said first elastic body (221) is in the form of a sheet.
6. The electric machine according to claim 4, characterized in that the elastic member (22) further comprises a second elastic body (222) disposed at one end of the first elastic body (221) connected to the second shaft portion (212) and forming a U-shaped structure with the first elastic body (221).
7. The electric machine of claim 6, further comprising a housing (40), an end cap (50) disposed at one end of the housing (40), and a housing (60) disposed at an end of the end cap (50) distal from the housing (40); the second shaft part (212) penetrates out of the end cover (50);
the second elastic body (222) is L-shaped, and one side of the second elastic body, which is opposite to the first elastic body (221), is abutted against the inner side wall of the shell (60).
8. The machine according to claim 1, characterized in that the stator assembly (10) comprises a stator core (11) and at least two coil windings (12) wound on the stator core (11).
9. The machine according to claim 8, wherein the stator assembly (10) further comprises a winding support (13) provided in the stator core (11) for the at least two coil windings (12) to be wound;
the stator core (11) comprises a first splicing part (111) and a second splicing part (112) spliced with the first splicing part (111);
the winding bracket (13) comprises a first winding part (131) arranged in the first splicing part (111) in a penetrating way and a second winding part (132) arranged in the second splicing part (112) in a penetrating way and spliced with the first winding part (131).
10. The electric machine according to claim 8, wherein the rotor assembly (20) further comprises a rotor core (23) inserted into the stator core (11), and at least one pair of magnetic steels (24) arranged on the rotor core (23);
the first shaft portion (211) is inserted into the rotor core (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910913947.4A CN110601434A (en) | 2019-09-25 | 2019-09-25 | Electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910913947.4A CN110601434A (en) | 2019-09-25 | 2019-09-25 | Electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110601434A true CN110601434A (en) | 2019-12-20 |
Family
ID=68863530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910913947.4A Pending CN110601434A (en) | 2019-09-25 | 2019-09-25 | Electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110601434A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244053A (en) * | 2021-12-21 | 2022-03-25 | 朱忠磊 | Vibration device |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100132139A1 (en) * | 2006-12-23 | 2010-06-03 | Braun Gmbh | Drive device for driving a brush element of an electric toothbrush |
| US20100277013A1 (en) * | 2009-05-02 | 2010-11-04 | The Procter & Gamble Company | Oscillatory System For A Motorized Drive Unit |
| CN102111032A (en) * | 2010-04-26 | 2011-06-29 | 王凤梅 | High-frequency vibration motor for electric toothbrush |
| CN205911933U (en) * | 2016-08-26 | 2017-01-25 | 雷细菊 | Electric toothbrush high -frequency vibration motor |
| CN206180759U (en) * | 2016-11-18 | 2017-05-17 | 广东新宝电器股份有限公司 | High -frequency vibration motor |
| CN206499540U (en) * | 2016-11-07 | 2017-09-19 | 深圳市加卓特科技有限公司 | Electric toothbrush motor and electric toothbrush |
| CN206759282U (en) * | 2017-05-21 | 2017-12-15 | 江门市西屋厨房小家电有限公司 | A kind of dither motor |
| CN107928827A (en) * | 2016-10-13 | 2018-04-20 | 广东新宝电器股份有限公司 | Electric toothbrush |
| CN207442674U (en) * | 2017-09-17 | 2018-06-01 | 朱忠磊 | Small-sized high-frequency vibration device |
| CN208723706U (en) * | 2018-08-31 | 2019-04-09 | 东莞市优康电器有限公司 | A kind of sound wave motor |
| CN208723758U (en) * | 2018-08-14 | 2019-04-09 | 深圳市雅杰乐科技有限公司 | High-frequency vibration device and the electric toothbrush for using the device |
| CN209435087U (en) * | 2018-12-26 | 2019-09-24 | 惠州明联佳实业有限公司 | A kind of eccentric motor for acoustic toothbrush |
| CN210898782U (en) * | 2019-09-25 | 2020-06-30 | 无音速(深圳)科技有限公司 | Electric machine |
-
2019
- 2019-09-25 CN CN201910913947.4A patent/CN110601434A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100132139A1 (en) * | 2006-12-23 | 2010-06-03 | Braun Gmbh | Drive device for driving a brush element of an electric toothbrush |
| US20100277013A1 (en) * | 2009-05-02 | 2010-11-04 | The Procter & Gamble Company | Oscillatory System For A Motorized Drive Unit |
| CN102111032A (en) * | 2010-04-26 | 2011-06-29 | 王凤梅 | High-frequency vibration motor for electric toothbrush |
| CN205911933U (en) * | 2016-08-26 | 2017-01-25 | 雷细菊 | Electric toothbrush high -frequency vibration motor |
| CN107928827A (en) * | 2016-10-13 | 2018-04-20 | 广东新宝电器股份有限公司 | Electric toothbrush |
| CN206499540U (en) * | 2016-11-07 | 2017-09-19 | 深圳市加卓特科技有限公司 | Electric toothbrush motor and electric toothbrush |
| CN206180759U (en) * | 2016-11-18 | 2017-05-17 | 广东新宝电器股份有限公司 | High -frequency vibration motor |
| CN206759282U (en) * | 2017-05-21 | 2017-12-15 | 江门市西屋厨房小家电有限公司 | A kind of dither motor |
| CN207442674U (en) * | 2017-09-17 | 2018-06-01 | 朱忠磊 | Small-sized high-frequency vibration device |
| CN208723758U (en) * | 2018-08-14 | 2019-04-09 | 深圳市雅杰乐科技有限公司 | High-frequency vibration device and the electric toothbrush for using the device |
| CN208723706U (en) * | 2018-08-31 | 2019-04-09 | 东莞市优康电器有限公司 | A kind of sound wave motor |
| CN209435087U (en) * | 2018-12-26 | 2019-09-24 | 惠州明联佳实业有限公司 | A kind of eccentric motor for acoustic toothbrush |
| CN210898782U (en) * | 2019-09-25 | 2020-06-30 | 无音速(深圳)科技有限公司 | Electric machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244053A (en) * | 2021-12-21 | 2022-03-25 | 朱忠磊 | Vibration device |
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