CN217010493U - External winding type dynamic magnetic sound wave motor and electric toothbrush - Google Patents

Abstract

The utility model provides an external winding type moving magnetic sound wave motor and an electric toothbrush, comprising a shell, a rotor assembly and a stator assembly; the rotor assembly comprises a rotating shaft and an iron core fixedly sleeved on the rotating shaft, wherein the rotating shaft is rotatably connected with the shell, one end of the rotating shaft penetrates out of the shell, and two pairs of reverse magnetic poles are symmetrically distributed on the iron core by taking the rotating shaft as a center; the stator component comprises a U-shaped magnetizer and a coil wound in the middle of the U-shaped magnetizer, wherein two ends of the U-shaped magnetizer are fixedly arranged in the shell along the axial direction of the rotating shaft respectively and correspond to the radial positions of the two pairs of opposite magnetic poles along the rotating shaft respectively, and the coil is positioned outside the shell; the coil is used for introducing square wave alternating current to generate an alternating magnetic field, and the U-shaped magnetizer is used for conducting the alternating magnetic field to two ends of the alternating magnetic field to act on two pairs of opposite magnetic poles. The external winding type moving magnetic sound wave motor, namely the electric toothbrush, is simple and efficient in winding, and is beneficial to improving the torque of the motor.

Description

External winding type dynamic magnetic sound wave motor and electric toothbrush

Technical Field

The utility model belongs to the technical field of electric toothbrushes, and particularly relates to an external winding type moving magnetic sound wave motor and an electric toothbrush.

Background

The electric toothbrush can make the brush head generate high-frequency vibration to decompose the toothpaste into fine foam through the quick rotation or vibration of the motor, so as to deeply clean the slits between the teeth, promote the blood circulation of the oral cavity by utilizing the vibration of the brush hairs and massage the gum tissues. At present, the electric toothbrush mostly adopts the moving magnet type sound wave motor, so the name is obtained because the vibration frequency of the brush head can reach the sound wave frequency order of magnitude, the main structure is an outer stator and an inner rotor, wherein, the outer stator is fixed with a machine shell after being wound on a coating iron core or a wire frame, the inner rotor is provided with an iron core on a rotor shaft thereof, then 4pcs magnetic steel which is filled with two pairs of poles or 2pcs magnetic steel which is filled with four pairs of poles are fixed in a surface pasting or inserting sheet mode, and the left-right reciprocating swinging vibration of the rotor is realized by utilizing an alternating magnetic field after alternating current is introduced into the coil.

Because the current common moving-magnet type sound wave motor all adopts the structural style of internal winding, and this kind of winding mode is limited to the complex structure of line frame, therefore the winding degree of difficulty is big, inefficiency, and because the coil can occupy a large amount of spaces in the casing, therefore the external diameter size of rotor is limited to can restrict the moment of torsion promotion of motor, and then influence electric toothbrush's performance.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an external winding type moving magnetic sound wave motor and an electric toothbrush, and aims to solve the problems of high winding difficulty and low torque of the existing sound wave motor for the electric toothbrush.

In order to achieve the purpose, the utility model adopts the technical scheme that: in a first aspect, an external winding type moving magnetic acoustic wave motor is provided, which comprises a shell, a rotor assembly and a stator assembly; the rotor assembly comprises a rotating shaft and an iron core fixedly sleeved on the rotating shaft, wherein the rotating shaft is rotatably connected with the shell, one end of the rotating shaft penetrates out of the shell, and two pairs of reverse magnetic poles are symmetrically distributed on the iron core by taking the rotating shaft as a center; the stator component comprises a U-shaped magnetizer and a coil wound in the middle of the U-shaped magnetizer, wherein two ends of the U-shaped magnetizer are fixedly arranged in the shell along the axial direction of the rotating shaft respectively and correspond to the radial positions of the two pairs of opposite magnetic poles along the rotating shaft respectively, and the coil is positioned outside the shell; the coil is used for introducing square wave alternating current to generate an alternating magnetic field, and the U-shaped magnetizer is used for conducting the alternating magnetic field to two ends of the U-shaped magnetizer to act on two pairs of opposite magnetic poles.

With reference to the first aspect, in a possible implementation manner, a lateral cross section of the U-shaped magnetizer is a semi-arc shape suitable for being attached and fixed to the inner circumferential wall of the casing.

In some embodiments, both ends of the U-shaped magnetizer are flush with the side wall of the iron core far away from the coil.

Illustratively, the U-shaped magnetizer is formed by stacking a plurality of U-shaped magnetizers.

In some embodiments, each pair of opposite magnetic poles is two magnetic steels which are distributed at intervals along the circumferential direction of the rotating shaft and are oppositely magnetized.

Illustratively, the iron core is provided with a separation groove between two pieces of magnetic steel of each pair of opposite magnetic poles.

With reference to the first aspect, in one possible implementation, the housing includes a main housing and an end cap; one end of the main shell is open, the other end of the main shell is closed, a first bearing is embedded on the end wall of the closed end of the main shell, and the inner ring of the first bearing is fixedly sleeved with the rotating shaft; one side of the end cover is provided with a boss which is suitable for being inserted into the open end of the main shell, a second bearing is embedded on the end cover, and the inner ring of the second bearing is sleeved on the rotating shaft.

For example, one side butt that the second bearing deviates from the iron core has the jump ring, and the jump ring clamps in the pivot, and one side butt elastic element of second bearing towards the iron core, the elastic element cover is located in the pivot and with the iron core butt.

Illustratively, the closed end of the main housing is provided with a baffle extending away from the open end thereof to shield the coil.

The external winding type moving magnetic acoustic wave motor provided by the utility model has the beneficial effects that: compared with the prior art, the external winding type moving magnetic sound wave motor has the advantages that the coil is wound in the middle of the U-shaped magnetizer and is arranged outside the shell, two side edges of the U-shaped magnetizer penetrate into the shell and respectively correspond to the two pairs of reverse magnetic poles, when square wave alternating current is introduced into the coil to generate an alternating magnetic field, the U-shaped magnetizer can conduct the alternating magnetic field to the two side edges positioned inside the shell, so that the alternating magnetic field interacts with the two pairs of reverse magnetic poles to push the iron core and the rotating shaft to swing left and right in a reciprocating mode, the coil is wound at the position, outside the shell, of the U-shaped magnetizer, winding difficulty of the coil can be reduced, winding efficiency can be improved, and the coil does not occupy space inside the shell, so that an iron core with a larger size can be conveniently arranged in the shell to improve motor torque, and further performance of an electric toothbrush can be improved.

In a second aspect, an embodiment of the present invention further provides an electric toothbrush, which includes the external winding type moving magnetic acoustic wave motor, and has the same beneficial effects as the external winding type moving magnetic acoustic wave motor, which are not described again.

Drawings

Fig. 1 is a schematic structural diagram of an external winding type moving magnetic acoustic wave motor in an axial sectional view along a rotating shaft thereof according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an external winding type moving magnetic acoustic wave motor in a radial sectional view along a rotating shaft thereof according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of an external winding type moving magnetoacoustic wave motor according to an embodiment of the present invention.

In the figure: 10. a housing; 11. a main housing; 111. a first bearing; 112. a baffle plate; 12. an end cap; 121. a second bearing; 122. a clamp spring; 123. an elastic element; 124. a boss; 20. a rotor assembly; 21. a rotating shaft; 22. an iron core; 221. a reverse magnetic pole; 222. separating the grooves; 30. a stator assembly; 31. a U-shaped magnetizer; 32. and a coil.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1 to 3, the externally wound moving magnetoacoustic wave motor according to the present invention will be described. The external winding type moving magnetic acoustic wave motor comprises a shell 10, a rotor assembly 20 and a stator assembly 30; the rotor assembly 20 comprises a rotating shaft 21 and an iron core 22 fixedly sleeved on the rotating shaft 21, wherein the rotating shaft 21 is rotatably connected with the shell 10, one end of the rotating shaft passes through the shell 10, and two pairs of opposite magnetic poles 221 are symmetrically distributed on the iron core 22 by taking the rotating shaft 21 as a center; the stator assembly 30 includes a U-shaped magnetizer 31 and a coil 32 wound around the middle portion of the U-shaped magnetizer 31, wherein two ends of the U-shaped magnetizer 31 are respectively and fixedly inserted into the casing 10 along the axial direction of the rotating shaft 21, and respectively correspond to the radial positions of the two pairs of opposite magnetic poles 221 along the rotating shaft 21, and the coil 32 is located outside the casing 10; the coil 32 is used for passing square wave alternating current to generate an alternating magnetic field, and the U-shaped magnetizer 31 is used for conducting the alternating magnetic field to two ends of the alternating magnetic field to act on the two pairs of opposite magnetic poles 221.

It should be noted that the fixed connection between the rotating shaft 21 and the iron core 22 is equivalent to a whole, the iron core 22 may be fixed with magnetic poles in a surface-mount or insertion manner, and the two pairs of opposite magnetic poles 221 may be specifically two pairs of poles respectively charged with 4pcs magnetic steel, or four pairs of poles respectively charged with 2pcs magnetic steel, which is a magnetic pole distribution manner commonly used in the prior art and will not be described in detail herein; two sides of the U-shaped magnetizer 31 penetrate into the casing 10 and then are fixedly connected with the inner peripheral wall of the casing 10 in an adhesion manner, and the magnetic field generated by electrifying the coil 32 can be transmitted to the inside of the casing 10 (the two sides of the U-shaped magnetizer 31) by utilizing the magnetic field conduction characteristic of the U-shaped magnetizer 31, so that magnetic driving force is generated on the two pairs of opposite magnetic poles 221 at corresponding positions, and because square wave alternating current is introduced into the coil 32, the magnetic field generated by the coil 32 can change along with the alternating frequency of the current, so that the driving force of the alternating magnetic field on the two pairs of opposite magnetic poles 221 is continuously reversed, the continuous reciprocating swing of the iron core 22 and the rotating shaft 21 is realized, and the part of the rotating shaft 21 extending out of the casing 10 is used for connecting with a brush head of an electric toothbrush to enable the brush head to generate reciprocating vibration.

Compared with the prior art, the external winding type moving magnetic acoustic wave motor provided by the embodiment has the advantages that the coil 32 is wound in the middle of the U-shaped magnetizer 31 and is arranged outside the shell 10, two side edges of the U-shaped magnetizer 31 penetrate into the shell 10 and respectively correspond to the two pairs of opposite magnetic poles 221, when the coil 32 is fed with square wave alternating current to generate an alternating magnetic field, the U-shaped magnetizer 31 can transmit the alternating magnetic field to the two side edges positioned inside the shell 10, so that the alternating magnetic field interacts with the two pairs of opposite magnetic poles 221 to push the iron core 22 and the rotating shaft 21 to swing back and forth, because the coil 32 is wound at the position where the U-shaped magnetizer 31 is positioned outside the shell 10, not only can the winding difficulty of the coil 32 be reduced, and the winding efficiency can be improved, but also because the coil 32 does not occupy the space inside the shell 10, the iron core 22 with a larger size can be conveniently arranged inside the shell 10 to improve the motor torque, thereby improving the performance of the electric toothbrush.

In some embodiments, referring to fig. 2, the lateral cross-section of the U-shaped magnetic conductor 31 is a semi-arc shape adapted to fit and fix on the inner peripheral wall of the casing 10. Adopt half curved structural style can ensure that iron core 22 reciprocal swing in-process, iron core 22's radial all the time with the side tangential of U nature magnetizer perpendicular, can ensure promptly that two pairs of opposite magnetic poles 221 receive the drive of maximum magnetic field force all the time to can improve the moment of torsion of pivot 21, promote electric toothbrush's performance.

In this embodiment, referring to fig. 1, both ends of U-shaped magnetizer 31 are flush with the side wall of iron core 22 far from coil 32. The U-shaped magnetizer 31 is ensured to conduct the alternating magnetic field generated by the coil 32 to the whole axial length range of the iron core 22, thereby avoiding magnetic loss and improving driving efficiency.

Specifically, the U-shaped magnetic conductor 31 is formed by stacking a plurality of U-shaped magnetic conductive sheets. The process is mature, the processing and the manufacturing are convenient, and the cost is low.

In some possible implementations, referring to fig. 2, each pair of opposite magnetic poles 221 is two magnetic steels that are distributed at intervals along the circumferential direction of the rotating shaft 21 and are oppositely magnetized. Two reversely magnetized magnetic steels are adopted as a pair of reverse magnetic poles 221, so that the iron core 22 can be conveniently processed and manufactured, and can also be conveniently installed and fixed on the iron core 22, specifically, the iron core 22 is provided with embedded through holes extending along the axial direction of the iron core, the magnetic steels penetrate into the embedded through holes after the peripheral wall is coated with glue to form fixed connection with the iron core 22, the connection mode is simple and reliable, and the assembly is convenient and efficient.

It should be noted that, in order to avoid the magnetic fields on the two magnetic steels interfering with each other and affecting the driving effect, in this embodiment, the iron core 22 is provided with the separation groove 222 between the two magnetic steels of each pair of opposite magnetic poles 221.

In some embodiments, the housing 10 is configured as shown in fig. 1, and the housing 10 includes a main housing 11 and an end cap 12; one end of the main housing 11 is open, the other end is closed, a first bearing 111 is embedded on the end wall of the closed end of the main housing 11, and an inner ring of the first bearing 111 is fixedly sleeved with the rotating shaft 21; a boss 124 suitable for being inserted into the open end of the main housing 11 is arranged on one side of the end cover 12, a second bearing 121 is embedded on the end cover 12, and the inner ring of the second bearing 121 is sleeved on the rotating shaft 21. Adopt the split type package assembly of the main casing body 11 and end cover 12, can conveniently assemble, reduce cost, utilize the boss 124 of end cover 12 one side to peg graft with the main casing body 11 open end simultaneously, can guarantee the axiality of the first bearing 111 and the second bearing 121 after end cover 12 is connected with the main casing body 11, ensure that the rotation process of pivot 21 is smooth and easy low resistance to reduce rotor assembly 20's power loss, improve its effective work efficiency.

Optionally, in this embodiment, a clamp spring 122 is abutted to one side of the second bearing 121 facing away from the iron core 22, the clamp spring 122 is clamped on the rotating shaft 21, one side of the second bearing 121 facing the iron core 22 is abutted to the elastic element 123, and the elastic element 123 is sleeved on the rotating shaft 21 and abutted to the iron core 22. Utilize elastic element 123 (specifically can make the spring) to exert elastic pushing force to second bearing 121 to make second bearing 121 elasticity support and press on jump ring 122, thereby form the axial positioning to end cover 12, can avoid end cover 12 to take place the axial float in the course of the work, improve motor operating stability.

Specifically, the closed end of the main housing 11 in this embodiment is provided with a baffle 112 extending away from the open end thereof to shield the coil 32. Since the coil 32 is located outside the housing 10, in order to protect the coil 32, the baffle 112 is provided at the closed end of the main housing 11 to shield the coil 32, so that a failure caused by other components of the electric toothbrush colliding with the coil 32 can be avoided, and the operation stability of the motor can be improved.

Based on the same inventive concept, please refer to fig. 1 to 3, the embodiment of the present application further provides an electric toothbrush, which includes the external winding type moving magnetic acoustic wave motor.

The electric toothbrush provided by the embodiment adopts the external winding type moving magnetic sound wave motor, the coil 32 is wound in the middle of the U-shaped magnetizer 31 and is arranged outside the shell 10, two side edges of the U-shaped magnetizer 31 penetrate into the shell 10 and respectively correspond to the two pairs of reverse magnetic poles 221, when the coil 32 is introduced with square wave alternating current to generate an alternating magnetic field, the U-shaped magnetizer 31 can transmit the alternating magnetic field to the two side edges positioned inside the shell 10, so as to interact with the two pairs of reverse magnetic poles 221 to push the iron core 22 and the rotating shaft 21 to perform left-right reciprocating swing, as the coil 32 is wound on the position of the U-shaped magnetizer 31 positioned outside the shell 10, the winding difficulty of the coil 32 can be reduced, the winding efficiency can be improved, and as the coil 32 does not occupy the space inside the shell 10, the iron core 22 with larger size can be conveniently arranged in the shell 10 to improve the motor torque, thereby improving the performance of the electric toothbrush.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the utility model, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims (10)

1. Outer winding type moves magnetic acoustic wave motor, its characterized in that includes:

a housing;

the rotor assembly comprises a rotating shaft and an iron core fixedly sleeved on the rotating shaft, wherein the rotating shaft is rotatably connected with the shell, one end of the rotating shaft penetrates out of the shell, and two pairs of reverse magnetic poles are symmetrically distributed on the iron core by taking the rotating shaft as a center;

the stator assembly comprises a U-shaped magnetizer and a coil wound in the middle of the U-shaped magnetizer, wherein two ends of the U-shaped magnetizer are fixedly arranged in the shell respectively along the axial direction of the rotating shaft in a penetrating way and respectively correspond to the radial positions of the two pairs of the reverse magnetic poles along the rotating shaft, and the coil is positioned outside the shell;

the coil is used for introducing square wave alternating current to generate an alternating magnetic field, and the U-shaped magnetizer is used for conducting the alternating magnetic field to two ends of the alternating magnetic field to act on the two pairs of the reverse magnetic poles.

2. The wound rotor moving magnetoacoustic wave machine of claim 1, wherein the U-shaped magnetic conductor has a lateral cross-section in the shape of a half arc adapted to fit and fix to the inner circumferential wall of the housing.

3. The externally wound, moving magnetoacoustic wave motor of claim 2, wherein the U-shaped magnetizer has two ends flush with the side walls of the iron core away from the coil.

4. The externally wound moving magnetoacoustic wave motor of claim 1, wherein the U-shaped magnetic conductor is a stack of a plurality of U-shaped magnetic conductor sheets.

5. The externally wound moving magnet acoustic wave machine of claim 1, wherein each pair of opposing poles is two oppositely magnetized magnetic steels spaced apart along the circumference of the shaft.

6. The externally wound moving magnet acoustic wave machine of claim 5, wherein said core is provided with a spacer between the two magnets of each pair of said opposing poles.

7. An externally wound, moving magnetoacoustic wave motor as claimed in any of claims 1 to 6, wherein the housing comprises:

the end wall of the closed end of the main shell is embedded with a first bearing, and an inner ring of the first bearing is fixedly sleeved with the rotating shaft;

and one side of the end cover is provided with a boss which is suitable for being inserted into the open end of the main shell, a second bearing is embedded on the end cover, and the inner ring of the second bearing is sleeved on the rotating shaft.

8. The externally wound moving magnet acoustic wave motor according to claim 7, wherein a clamp spring is abutted to a side of the second bearing facing away from the iron core, the clamp spring is clamped on the rotating shaft, an elastic element is abutted to a side of the second bearing facing the iron core, and the elastic element is sleeved on the rotating shaft and abutted to the iron core.

9. The external winding magnetic acoustic wave motor according to claim 7, wherein the closed end of the main housing is provided with a baffle plate extending away from the open end thereof to shield the coil.

10. An electric toothbrush comprising an external winding type moving magnetoacoustic wave motor according to any one of claims 1 to 9.

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