CN116683720A

CN116683720A - Motor and electric toothbrush

Info

Publication number: CN116683720A
Application number: CN202210170771.XA
Authority: CN
Inventors: 张震坚; 叶泽生
Original assignee: Guangzhou Stars Pulse Co Ltd
Current assignee: Guangzhou Stars Pulse Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2023-09-01

Abstract

The embodiment of the application discloses a motor and an electric toothbrush. The motor comprises a shell, a rotating shaft, a stator, a first rotor, a second rotor and a first elastic piece, wherein the first rotor is fixedly connected with the rotating shaft and can move relative to the stator; one end of the first elastic piece is connected with the first rotor, and the other end of the first elastic piece is connected with the second rotor; when the first rotor moves relative to the stator, the acting force born by one end of the first elastic element connected with the first rotor is opposite to the acting force born by one end of the first elastic element connected with the second rotor. According to the application, the two ends of the first elastic piece are respectively connected with the first rotor and the second rotor, when the first rotor moves relative to the stator, the first rotor transmits acting force to the second rotor through the first elastic piece, the first elastic piece has an energy storage function, at least part of the motion inertia of the first rotor and the motion inertia of the second rotor can be mutually offset, and therefore, the vibration phenomenon of the shell is reduced.

Description

Motor and electric toothbrush

Technical Field

The application relates to the technical field of motors, in particular to a motor and an electric toothbrush.

Background

With the continuous improvement of the living standard of people, the motor is widely applied. The motor is a device for converting electric energy into mechanical energy, and mainly comprises a stator, a rotor, a shell and other parts, and the rotor rotates relative to the stator to realize the output of power. However, during the movement of the motor, the housing of the motor may vibrate, affecting the use of the motor.

Disclosure of Invention

The application provides a motor and an electric toothbrush, which are used for solving the problem that the use effect of the motor is affected due to vibration of a shell of the motor in the process of movement of the motor.

In a first aspect, the present application provides an electric machine comprising:

a housing;

one end of the rotating shaft is positioned in the shell, and the other end of the rotating shaft is positioned outside the shell;

a stator connected to the housing;

the first rotor is positioned in the shell and fixedly connected with the rotating shaft, and can move relative to the stator;

a second rotor located within the housing;

one end of the first elastic piece is connected with the first rotor, and the other end of the first elastic piece is connected with the second rotor; when the first rotor moves relative to the stator, the acting force born by one end of the first elastic piece connected with the first rotor is opposite to the acting force born by one end of the first elastic piece connected with the second rotor.

In a second aspect, the present application provides an electric toothbrush comprising:

a housing;

the mounting bracket is arranged in the shell;

the motor is positioned in the shell and is arranged on the mounting bracket, and the part of the rotating shaft of the motor extends out of the shell.

According to the motor and the electric toothbrush, the two ends of the first elastic piece are respectively connected with the first rotor and the second rotor, when the first rotor moves relative to the stator, acting force is transmitted to the second rotor through the first elastic piece, the first elastic piece plays a role in energy storage, and at least part of the motion inertia of the first rotor can be mutually counteracted with the motion inertia (such as the rotation inertia) of the second rotor, so that the vibration phenomenon of the shell is reduced. When the first rotor moves relative to the stator, the acting force born by one end of the first elastic piece connected with the first rotor is designed to be opposite to the acting force born by one end of the first elastic piece connected with the second rotor, so that the movement trend of the first rotor relative to the stator is opposite to the movement trend of the second rotor relative to the stator, the acting force of the first rotor given to the stator is opposite to the acting force of the second rotor given to the stator, the two acting forces can be partially or completely counteracted, the acting force transmitted to the shell by the stator is further reduced, and the vibration phenomenon of the shell is reduced. In addition, compared with the single-rotor motor in the related art, the motor has the advantages that the magnetic field generated by the stator is subjected to the reverse acting force of the rotor when acting force is generated on the rotor, and the reverse acting force can cause energy loss such as stator vibration, and the acting force transmitted to the stator by the first rotor and the second rotor in the motor can be partially or completely counteracted, so that the motor has higher output power under the same input power compared with the single-rotor motor in the related art.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a motor provided by an embodiment of the present application;

fig. 2 is a perspective cross-sectional view of the motor shown in fig. 1 at a first plane; the first plane passes through the rotation axis of the rotating shaft;

fig. 3 is a perspective exploded view of the motor shown in fig. 1;

FIG. 4 is a perspective cross-sectional view of the motor shown in FIG. 1 at a second plane; the second plane passes through the rotation axis of the rotating shaft and is perpendicular to the first plane;

fig. 5 is a perspective view of a first elastic member in the motor shown in fig. 1;

FIG. 6 is a perspective view of the first and second ends of the first resilient member in the motor shown in FIG. 1 in a first plane;

FIG. 7 is a further perspective exploded view of the motor shown in FIG. 1;

FIG. 8 is a cross-sectional view of the motor shown in FIG. 1 at a third plane, the third plane being perpendicular to the rotational axis of the shaft;

FIG. 9 is a further perspective exploded view of the motor shown in FIG. 1;

fig. 10 is a perspective view of the motor shown in fig. 1 with the housing removed;

FIG. 11 is a perspective view of a coil in the motor shown in FIG. 1;

fig. 12 is a perspective view of a motor provided in accordance with yet another embodiment of the present application;

fig. 13 is a perspective view of the first elastic sheet of fig. 12.

Description of the drawings: 1. a motor; 11. a housing; 111. an opening; 12. a rotating shaft; 121. an axis of rotation; 13. a stator; 131. a coil; 1311. a sub-coil; 1311m, a first sub-coil; 1311n, a second sub-coil; 1312. a first surrounding layer; 1313. a second surrounding layer; 132. a mounting part; 1321. a first connection plate; 1322. a second connecting plate; 1323. a first sleeve; 1324. a second sleeve; 1325. a third connecting plate; 133. a limit groove; 1331. a first wall surface; 1332. a second wall surface; 134. a groove; 14. a first rotor; 141. a first portion; 142. a second portion; 143. a first mounting groove; 144. a first magnetic member; 1441. a first magnet; 1442. a second magnet; 1443. a first sub-section; 1444. a second sub-section; 1445. a third sub-section; 1446. a fourth sub-section; 145. a limit part; 15. a second rotor; 151. a third section; 152. a fourth section; 153. a second mounting groove; 154. a second magnetic member; 1541. a third magnet; 1542. a fourth magnet; 1543. a fifth sub-section; 1544. a sixth subsection; 1545. a seventh subsection; 1546. an eighth subsection; 16. a first elastic member; 161. an intermediate section; 162. a first connection section; 163. a second connection section; 164. a first end; 1641. a first projection; 165. a second end; 1651. a second projection; 166. a first arcuate segment; 167. a second arcuate segment; 168. a third arcuate segment; 169. a gasket; 17. a bearing; 18. an end cap; 19. a second elastic member; 191. a first elastic sheet; 20. a third elastic member; 201. and a second elastic sheet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings.

When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application as detailed in the accompanying claims.

The embodiment of the application provides a motor 1. Referring to fig. 1 to 3, the motor 1 includes a housing 11, a rotating shaft 12, a stator 13, and a first rotor 14.

Specifically, one end of the rotating shaft 12 is located in the housing 11, and the other end is located outside the housing 11; the stator 13 is connected with the housing 11, the first rotor 14 is located in the housing 11 and fixedly connected with the rotating shaft 12, and the first rotor 14 can move relative to the stator 13. The movement of the first rotor 14 relative to the stator 13 can realize the movement of the rotating shaft 12 connected with the first rotor 14 relative to the housing 11 connected with the stator 13, so that if other devices are connected to the rotating shaft 12, the rotating shaft 12 can drive the other devices to move relative to the housing 11, and drive force is brought to the movement of the other devices.

It should be noted that the movement of the first rotor 14 in the movement relative to the stator 13 may be rotation and/or translation. Alternatively, the first rotor 14 may rotate relative to the stator 13 such that the first rotor 14 rotates relative to the stator 13 in a direction generally about the axis of rotation 121 of the shaft 12; translation of the first rotor 14 relative to the stator 13 may be such that the first rotor 14 moves relative to the stator 13 generally in a direction parallel to the axis of rotation 121. Of course, the direction of rotation or translation of the first rotor 14 relative to the stator 13 may be any other direction, which is not limited in the embodiment of the present application.

When the first rotor 14 moves relative to the stator 13, the stator 13 is fixed to the housing 11, and a reaction force given to the stator 13 by the first rotor 14 is transmitted to the housing 11 in a vibration form, so that the housing 11 vibrates. For this reason, the motor 1 according to the embodiment of the present application further includes a second rotor 15 and a first elastic member 16, where the second rotor 15 is disposed in the housing 11 and is movably connected to the rotating shaft 12. One end of the first elastic member 16 is connected to the first rotor 14, and the other end is connected to the second rotor 15. The two ends of the first elastic member 16 are respectively connected with the first rotor 14 and the second rotor 15, when the first rotor 14 moves relative to the stator 13, the first rotor 14 transmits acting force to the second rotor 15 through the first elastic member 16, the first elastic member 16 plays a role in energy storage, and at least part of the motion inertia of the first rotor 14 and the motion inertia (such as the rotation inertia) of the second rotor 15 can cancel each other, so that the vibration phenomenon of the housing 11 is reduced.

Further, when the first rotor 14 moves relative to the stator 13, the acting force applied to the end of the first elastic member 16 connected to the first rotor 14 is opposite to the acting force applied to the end of the first elastic member 16 connected to the second rotor 15, so that the movement trend of the first rotor 14 relative to the stator 13 is opposite to the movement trend of the second rotor 15 relative to the stator 13, and thus the acting force applied to the stator 13 by the first rotor 14 is opposite to the acting force applied to the stator 13 by the second rotor 15, the two acting forces can be partially or completely offset, and the acting force transmitted to the housing 11 by the stator 13 is reduced, so that the vibration phenomenon of the housing 11 is reduced.

When the first rotor 14 moves relative to the stator 13, the acting force applied by the end of the first elastic member 16 connected to the first rotor 14 is opposite to the acting force applied by the end of the first elastic member 16 connected to the second rotor 15: in one exemplary version, the second rotor 15 may be substantially stationary relative to the shaft 12 as the first rotor 14 moves relative to the stator 13; for example, when the second rotor 15 is movably sleeved on the rotating shaft 12, and the acting force transmitted to the second rotor 15 by the first rotor 14 through the first elastic member 16 is smaller than the gravity of the second rotor 15, the second rotor 15 may be substantially stationary relative to the rotating shaft 12. In another exemplary embodiment, when the first rotor 14 moves relative to the stator 13, the second rotor 15 may also move relative to the stator 13, and the movement direction of the second rotor 15 relative to the stator 13 is the same as the movement direction of the first rotor 14 relative to the stator 13; for example, when the second rotor 15 is movably sleeved on the rotating shaft 12 and the acting force transmitted from the first rotor 14 to the second rotor 15 through the first elastic member 16 is greater than the gravity of the second rotor 15, the second rotor 15 can move relative to the rotating shaft 12 under the driving of the first rotor 14 and the first elastic member 16. In yet another exemplary embodiment, when the first rotor 14 moves relative to the stator 13, the second rotor 15 may also move relative to the stator 13, and the direction of movement of the second rotor 15 relative to the stator 13 is opposite to the direction of movement of the first rotor 14 relative to the stator 13; at this time, the second rotor 15 may move relative to the stator 13 under the driving of other driving forces, in this solution, since the acting force of the first rotor 14 received by the stator 13 is opposite to the acting force of the second rotor 15 received by the stator 13, the two acting forces may partially or completely cancel each other, so as to reduce the vibration of the housing 11.

Preferably, the force of the first rotor 14 applied to the stator 13 is opposite to the force of the second rotor 15 applied to the stator 13, and the two forces are approximately equal, so that the sum of the forces of the first rotor 14 and the second rotor 15 applied to the stator 13 is zero, and the stator 13 does not output vibration to the housing 11.

Compared with the single-rotor motor in the related art, the application has the advantages that the magnetic field generated by the stator is subjected to the reverse acting force of the rotor when acting force is generated on the rotor, and the reverse acting force can cause energy loss such as stator vibration, and the like, because the acting force transmitted to the stator 13 by the first rotor 14 and the second rotor 15 in the motor 1 can be partially or completely counteracted, the motor 1 has higher output power under the same input power compared with the single-rotor motor in the related art.

Alternatively, the first rotor 14 and the second rotor 15 are both sleeved on the rotating shaft 12, and the movement of the first rotor 14 relative to the stator 13 may be that the first rotor 14 rotates relative to the stator 13 approximately around the rotation axis 121 of the rotating shaft 12; the movement of the second rotor 15 relative to the stator 13 may be such that the second rotor 15 rotates relative to the stator 13 generally about the axis of rotation 121 of the shaft 12, as will be exemplified below for convenience of description.

Alternatively, the number of the first rotors 14 may be one, two, three, four, etc., which is not limited in the embodiment of the present application. Alternatively, the number of the second rotors 15 may be one, two, three, four, etc., which is not limited in the embodiment of the present application. When the number of the first rotors 14 is one and the number of the second rotors 15 is one, the structure of the motor 1 can be simplified, and the assembly is more convenient. When the number of the first rotors 14 is one and the number of the second rotors 15 is plural, the first rotors 14 may be located at one side of the plural second rotors 15, and the first rotors 14 may be located between the two second rotors 15, which is not limited in the embodiment of the present application. When the number of the second rotors 15 is one and the number of the first rotors 14 is plural, the second rotors 15 may be located at one side of the plural first rotors 14, and the second rotors 15 may be located between the two first rotors 14, which is not limited in the embodiment of the present application. When the number of the first rotors 14 and the number of the second rotors 15 are plural, the plurality of first rotors 14 may be located at one side, and the plurality of second rotors 15 may be located at the other side of the plurality of first rotors 14; or, among the plurality of first rotors 14, at least one first rotor 14 may be located between two second rotors 15; alternatively, at least one second rotor 15 of the plurality of second rotors 15 may be located between two first rotors 14, which is not limited in the embodiment of the present application.

Alternatively, in an exemplary embodiment, the first elastic member 16 may be connected between the other first rotor 14 and the second rotor 15 with the first rotor 14 interposed therebetween. Further, to avoid the first elastic member 16 being blocked by the middle first rotor 14, the first elastic member 16 may be bent to form a avoiding portion corresponding to the middle first rotor 14, so as to avoid the middle first rotor 14. In another exemplary embodiment, the first elastic member 16 may be connected between the other second rotor 15 with the second rotor 15 interposed therebetween and the first rotor 14. Further, in order to avoid the first elastic member 16 from being blocked by the intermediate second rotor 15, an avoidance portion may be formed at a position of the first elastic member 16 corresponding to the intermediate second rotor 15 so as to avoid the intermediate second rotor 15.

In yet another exemplary version, the first resilient member 16 is connected between the first rotor 14 and the second rotor 15 adjacent to the first rotor 14. That is, the first elastic member 16 is connected between the adjacent first rotor 14 and second rotor 15, so that the arrangement of the first elastic member 16 is simpler, the first elastic member 16 is not easily interfered by other unconnected rotors, the stress analysis is simpler, and the design difficulty is greatly reduced compared with the connection between the other first rotor 14 and second rotor 15 with a first rotor 14 in the middle or between the other second rotor 15 and first rotor 14 with a second rotor 15 in the middle. Hereinafter, an example will be described in which the first elastic member 16 is connected between the first rotor 14 and the second rotor 15 adjacent to the first rotor 14.

Referring to fig. 3 to 5, the first elastic member 16 may include a middle section 161, and a first connecting section 162 and a second connecting section 163 located at two ends of the middle section 161, where the first connecting section 162 is connected to the first rotor 14, and the second connecting section 163 is connected to the second rotor 15.

Alternatively, the intermediate section 161 may be elastic, the first connecting section 162 may be elastic or inelastic, and the second connecting section 163 may be elastic or inelastic. In the embodiment of the present application, the intermediate section 161 has elasticity, and the first connecting section 162 and the second connecting section 163 have no elasticity, so that the connection of the first connecting section 162 with the first rotor 14 and the connection of the second connecting section 163 with the second rotor 15 are facilitated.

Optionally, the intermediate section 161 is located between the first rotor 14 and the second rotor 15 and is spaced apart from both the first rotor 14 and the second rotor 15. So that the first rotor 14 and the second rotor 15 do not rub against the middle section 161 of the first elastic member 16 during rotation relative to the stator 13, and energy loss caused by abrasion is reduced. Optionally, shims 169 may be provided between the intermediate section 161 and the first rotor 14 and/or between the intermediate section 161 and the second rotor 15.

Alternatively, the first rotor 14 includes a first portion 141 and a second portion 142 disposed along a radial direction of the rotary shaft 12, and the second portion 142 is located on a side of the first portion 141 away from the rotation axis 121 of the rotary shaft 12. The second rotor 15 includes a third portion 151 and a fourth portion 152 disposed along a radial direction of the rotation shaft 12, the fourth portion 152 being located at a side of the third portion 151 away from the rotation axis 121, the first connecting section 162 being connected to the second portion 142, and the second connecting section 163 being connected to the fourth portion 152. That is, both ends of the first elastic member 16 are respectively connected to the outer peripheral portion of the first rotor 14 and the outer peripheral portion of the second rotor 15, so that the first elastic member 16 can have better elastic performance and energy storage capability. For example, when the first elastic member 16 is a spring, the two ends of the first elastic member 16 are respectively connected with the outer peripheral portion of the first rotor 14 and the outer peripheral portion of the second rotor 15, so that the radius of the spring is larger, and compared with the spring with smaller radius, the spring has better elastic performance and energy storage capability.

Alternatively, referring to fig. 5 and 6, the first elastic member 16 has a first end 164 connected to the first rotor 14 and a second end 165 connected to the second rotor 15, the first end 164 has a first projection 1641 projected on the first plane a, the second end 165 has a second projection 1651 projected on the first plane a, and the first projection 1641 and the second projection 1651 are symmetrical with respect to the rotation axis 121 of the rotating shaft 12. Wherein the first plane a is perpendicular to the rotation axis 121. So that the stress of the first elastic member 16 is relatively balanced, and the risks of breakage and the like are avoided.

It should be noted that, if the first elastic member 16 is divided into the middle section 161, the first connecting section 162 and the second connecting section 163, one end of the first connecting section 162 connected to the first rotor 14 may correspond to the first end 164, and one end of the second connecting section 163 connected to the second rotor 15 may correspond to the second end 165. Alternatively, the intermediate section 161 may be centrally symmetrical about the rotational axis 121 of the shaft 12. Further relatively balancing the forces of the first resilient element 16.

Optionally, referring to fig. 4 again, a first mounting groove 143 may be disposed on the first rotor 14, and one end of the first elastic member 16 may be mounted on the first mounting groove 143 to improve the connection stability between the first rotor 14 and the first elastic member 16. Further alternatively, the first mounting groove 143 may be provided on the second portion 142 of the first rotor 14. Optionally, the second rotor 15 may be provided with a second mounting groove 153, and the other end of the first elastic member 16 may be mounted in the second mounting groove 153, so as to improve the connection stability between the second rotor 15 and the first elastic member 16. Further alternatively, the second mounting groove 153 may be provided on the fourth portion 152 of the second rotor 15.

Alternatively, the first connecting section 162 may extend in a direction parallel to the rotation axis 121 and connect the first rotor 14. At this time, the first mounting groove 143 may extend along a direction parallel to the rotation axis 121, so that after the first rotor 14 is sleeved on the rotating shaft 12, the first rotor 14 moves on the rotating shaft 12 to enable the first connecting section 162 to be inserted into the first mounting groove 143, thereby simplifying the assembly process of the first elastic member 16 and the first rotor 14. Alternatively, the second connection section 163 may extend in a direction parallel to the rotation axis 121 and connect the second rotor 15. At this time, the second mounting groove 153 may extend along a direction parallel to the rotation axis 121, so that after the second rotor 15 is sleeved on the rotation shaft 12, the second rotor 15 moves on the rotation shaft 12 to enable the second connecting section 163 to be inserted into the second mounting groove 153, thereby simplifying the assembly process of the first elastic member 16 and the second rotor 15.

In one exemplary embodiment, the first resilient member 16 may be a spring. Specifically, the spring may extend in the direction of the rotation axis 121 of the rotation shaft 12. In another exemplary embodiment, referring again to fig. 5, the first elastic member 16 includes a first arc-shaped segment 166, two second arc-shaped segments 167 and two third arc-shaped segments 168, and the first arc-shaped segment 166 is disposed outside the rotating shaft 12 along the direction of the rotation axis 121 of the rotating shaft 12; one end of each second arc-shaped section 167 is connected to one end of the first arc-shaped section 166; one end of each third arc segment 168 is connected to one end of one second arc segment 167 away from the first arc segment 166, and the other end of each third arc segment 168 is connected to the first rotor 14 and the second rotor 15. Wherein, each second arc-shaped section 167 is protruded in a direction away from the first arc-shaped section 166, and each third arc-shaped section 168 is protruded in a direction away from the corresponding second arc-shaped section 167. The first elastic piece 16 is designed to comprise the first arc-shaped section 166, the two second arc-shaped sections 167 and the two third arc-shaped sections 168, so that the structure of the first elastic piece 16 can be approximately symmetrically distributed, and the stress balance of the first elastic piece 16 is facilitated; on the other hand, the first elastic member 16 may be made to have a flat shape substantially perpendicular to the rotation axis 121, and the dimension of the first elastic member 16 in the direction perpendicular to the rotation axis 121 may be reduced as compared to the columnar shape of the spring, so that the distance between the first rotor 14 and the second rotor 15 connected to the first elastic member 16 may be reduced.

Of the two third arc segments 168, the other end of each third arc segment 168 may be directly connected to the first rotor 14 and the second rotor 15. Of the two third arcuate sections 168, the other end of one third arcuate section 168 may also be connected to the first rotor 14 by the first connecting section 162, and the other end of the other third arcuate section 168 may be connected to the second rotor 15 by the second connecting section 163.

It should be noted that the first arcuate segment 166 may or may not be in contact with the shaft 12. Preferably, the first elastic member 16 is not in contact with the rotating shaft 12, so as to avoid friction between the first elastic member 16 and the rotating shaft 12 during rotation of the first rotor 14 and the second rotor 15 relative to the stator 13, and reduce energy loss caused by abrasion.

It will be appreciated that, to improve the performance of the motor 1, the elastic coefficient of the first elastic member 16 may be adaptively adjusted, so that the motor 1 can achieve a better frequency, swing and current under a specific load.

Alternatively, the movement of the first rotor 14 relative to the stator 13 may be achieved using magnetic field effects. For example, a region of the stator 13 corresponding to the first rotor 14 is used to generate a first magnetic field, and the first rotor 14 is used to generate a second magnetic field coupled to the first magnetic field, such that the first rotor 14 is movable relative to the stator 13. It should be noted that the movement of the first rotor 14 relative to the stator 13 may be implemented in other manners, which are not limited in this embodiment of the present application.

More specifically, in one exemplary scenario, referring to fig. 7, the stator 13 may include a coil 131 for generating a first magnetic field when energized, and the first rotor 14 may include a first magnetic member 144 for generating a second magnetic field. In this way, when the direction and magnitude of the energizing current of the coil 131 are changed, the first magnetic field may be changed, and the interaction between the changed first magnetic field and the second magnetic field may enable the first rotor 14 to move relative to the stator 13. In another exemplary version, the stator 13 may include a first magnetic member for generating a first magnetic field and the first rotor 14 includes a coil for generating a second magnetic field when energized. In this way, when the direction and magnitude of the energizing current of the coils are changed, a change in the second magnetic field can be made, and the interaction between the changed second magnetic field and the first magnetic field can also realize the movement of the first rotor 14 relative to the stator 13.

When the second rotor 15 moves relative to the stator 13 and the direction of movement of the second rotor 15 relative to the stator 13 is opposite to the direction of movement of the first rotor 14 relative to the stator 13, in one exemplary scenario, the region of the stator 13 corresponding to the second rotor 15 may be used to generate a third magnetic field and the second rotor 15 may be used to generate a fourth magnetic field coupled to the third magnetic field such that the second rotor 15 may move relative to the stator 13; wherein one of the magnetic flux directions of the first magnetic field and the third magnetic field, and the magnetic flux direction of the second magnetic field and the magnetic flux direction of the fourth magnetic field is opposite, so that the moving direction of the second rotor 15 is opposite to the moving direction of the first rotor 14.

Further alternatively, the stator 13 may include a coil 131, the coil 131 for generating the first magnetic field and the third magnetic field when energized; the first rotor 14 may include a first magnetic member 144, the first magnetic member 144 for generating a second magnetic field; the second rotor 15 may include a second magnetic member 154, the second magnetic member 154 for generating a fourth magnetic field. The magnetic force line direction of the first magnetic field is the same as the magnetic force line direction of the third magnetic field, and the magnetic force line direction of the second magnetic field is opposite to the magnetic force line direction of the fourth magnetic field.

Specifically, the first magnetic member 144 may include a first magnet 1441 and a second magnet 1442 disposed at intervals along the circumferential direction of the rotating shaft 12, where the first magnet 1441 and the second magnet 1442 each extend along the length direction of the rotating shaft 12, and the first magnet 1441 includes a first sub-portion 1443 near the rotation axis 121 of the rotating shaft 12 and a second sub-portion 1444 far from the rotation axis 121, and the polarities of the first sub-portion 1443 and the second sub-portion 1444 are opposite; the second magnet 1442 includes a third sub-portion 1445 near the rotation axis 121 and a fourth sub-portion 1446 far from the rotation axis 121, the polarity of the third sub-portion 1445 is opposite to that of the fourth sub-portion 1446, and the polarity of the second sub-portion 1444 is opposite to that of the fourth sub-portion 1446.

The second magnetic member 154 includes a third magnet 1541 and a fourth magnet 1542 that are disposed at intervals along the circumferential direction of the rotating shaft 12, and the third magnet 1541 and the fourth magnet 1542 each extend along the length direction of the rotating shaft 12, and the third magnet 1541 includes a fifth sub-portion 1543 near the rotating axis 121 and a sixth sub-portion 1544 far from the rotating axis 121, wherein the polarity of the fifth sub-portion 1543 is opposite to that of the sixth sub-portion 1544; the fourth magnet 1542 includes a seventh sub-portion 1545 proximate to the rotational axis 121 and an eighth sub-portion 1546 distal to the rotational axis 121, the seventh sub-portion 1545 being of opposite polarity to the eighth sub-portion 1546, and the sixth sub-portion 1544 being of opposite polarity to the eighth sub-portion 1546. Wherein the third magnet 1541 is disposed corresponding to the first magnet 1441, and the sixth sub-portion 1544 of the third magnet 1541 is opposite in polarity to the second sub-portion 1444 of the first magnet 1441; the fourth magnet 1542 is disposed corresponding to the second magnet 1442, and the eighth sub-portion 1546 of the fourth magnet 1542 is opposite in polarity to the fourth sub-portion 1446 of the second magnet 1442. The polarity of the second sub-portion 1444 of the first magnet 1441 on the first rotor 14 is designed to be opposite to the polarity of the corresponding sixth sub-portion 1544 of the third magnet 1541 on the second rotor 15, facilitating the homing alignment of the first rotor 14 and the second rotor 15 after use.

The distribution of the first magnetic elements 144 on the first rotor 14 and the distribution of the second magnetic elements 154 on the second rotor 15 and the distribution of the coils 131 are symmetrical about the first plane a, so that the acting force of the first rotor 14 received by the stator 13 and the acting force of the second rotor 15 received by the stator 13 can be counteracted more or even completely, so as to reduce the vibration phenomenon of the housing 11.

Optionally, the first rotor 14 may include a plurality of first magnetic members 144 disposed at intervals along the circumferential direction of the rotating shaft 12, so as to enhance the driving force generated between the first rotor 14 and the stator 13, and facilitate smooth movement of the first rotor 14 relative to the stator 13. Optionally, the second rotor 15 may include a plurality of second magnetic members 154 spaced along the circumference of the rotating shaft 12 to enhance the driving force generated between the second rotor 15 and the stator 13, so as to facilitate smooth movement of the second rotor 15 relative to the stator 13. When the first rotor 14 includes a plurality of first magnetic elements 144 and the second rotor 15 includes a plurality of second magnetic elements 154, the number of the first magnetic elements 144 may be equal to the number of the second magnetic elements 154, and each of the second magnetic elements 154 is disposed corresponding to one of the first magnetic elements 144.

Alternatively, the coil 131 may include more than two sub-coils 1311 spaced apart along the circumferential direction of the rotation shaft 12, and each sub-coil 1311 may be surrounded in a direction perpendicular to the rotation axis 121 of the rotation shaft 12, the first magnetic member 144 may be located between two adjacent sub-coils 1311, and the second magnetic member 154 may be located between two adjacent sub-coils 1311.

Alternatively, referring to fig. 7 and 8, the stator 13 and the first rotor 14 include one of the coils 131, and further include a mounting portion 132 for mounting the coils 131, the mounting portion 132 may include a first connection plate 1321 and a second connection plate 1322, the first connection plate 1321 and the second connection plate 1322 are distributed along the circumferential direction of the rotating shaft 12, the coils 131 include a first sub-coil 1311m and a second sub-coil 1311n that are disposed at intervals along the circumferential direction of the rotating shaft 12, the first sub-coil 1311m and the second sub-coil 1311n both encircle along a direction perpendicular to the rotation axis 121 of the rotating shaft 12, the first sub-coil 1311m is located at one end of the first connection plate 1321 and sleeved on the first connection plate 1321 and the second connection plate 1322, and the second sub-coil 1311n is located at the other end of the first connection plate 1321 and sleeved on the first connection plate 1321 and the second connection plate 1322.

Optionally, referring to fig. 8 and 9, the mounting portion 132 may further include a first sleeve 1323, a second sleeve 1324, and a third connecting plate 1325, where the first sleeve 1323 and the second sleeve 1324 are circumferentially spaced apart from each other along the rotating shaft 12, a central axis of the first sleeve 1323 and a central axis of the second sleeve 1324 are perpendicular to the rotating axis 121 of the rotating shaft 12, and the coil 131 includes a first sub-coil 1311m sleeved on the first sleeve 1323 around the central axis of the first sleeve 1323, and a second sub-coil 1311n sleeved on the second sleeve 1324 along the central axis of the second sleeve 1324; the third connection plate 1325 connects the first sleeve 1323 and the second sleeve 1324.

Optionally, when the mounting portion 132 includes the first connecting plate 1321, the second connecting plate 1322, the first sleeve 1323, the second sleeve 1324 and the third connecting plate 1325, the first sleeve 1323 may be located at one end of the first connecting plate 1321 and sleeved on the first connecting plate 1321 and the second connecting plate 1322, and the second sleeve 1324 may be located at the other end of the first connecting plate 1321 and sleeved on the first connecting plate 1321 and the second connecting plate 1322.

In the embodiment of the present application, the stator 13 includes the coil 131 and the mounting portion 132, and the first rotor 14 includes the first magnetic member 144. Alternatively, the third connection plate 1325 of the mounting portion 132 on the stator 13 may be located at a side of the first rotor 14 remote from the second rotor 15. Alternatively, referring to fig. 10, the third connecting plate 1325 may be disposed corresponding to the second connecting plate 1322, and an outer surface of the third connecting plate 1325 away from the rotation axis 121 may substantially match an outer surface of the second connecting plate 1322 away from the rotation axis 121.

Alternatively, one of the stator 13 and the first rotor 14 may be provided with a limiting portion 145, and the other of the stator 13 and the first rotor 14 is provided with a limiting groove 133, and the limiting portion 145 is located in the limiting groove 133 and is movable in the limiting groove 133. In the embodiment of the present application, the stator 13 is provided with a limiting groove 133, and the first rotor 14 is provided with a limiting portion 145. More specifically, the third connecting plate 1325 on the stator 13 is provided with a limiting groove 133, and the first rotor 14 is provided with a limiting portion 145 corresponding to the limiting groove 133. The limiting groove 133 and the limiting portion 145 may limit the swing amplitude of the first rotor 14 when moving relative to the stator 13, so that the first rotor 14 moves within a preset swing amplitude to reduce vibration.

Specifically, the inner wall surface of the limiting groove 133 may have a first wall surface 1331 and a second wall surface 1332 that are spaced apart in the direction of the rotation axis 121 of the rotating shaft 12, and when the limiting portion 145 moves to abut against the first wall surface 1331, the limiting portion corresponds to a first limit position at which the first rotor 14 swings in the first direction, and when the limiting portion 145 moves to abut against the second wall surface 1332, the limiting portion corresponds to a second limit position at which the first rotor 14 swings in the opposite direction of the first direction. The adjustment of the swing amplitude of the first rotor 14 can be achieved by adjusting the interval between the first wall surface 1331 and the second wall surface 1332, and the design manner is simple.

Alternatively, the rotation amplitude of the first rotor 14 with respect to the stator 13 in the direction of the rotation axis 121 of the rotating shaft 12 may be less than or equal to 30 °, so that the problem that the deformation amplitude of the first elastic member 16 is large and the energy storage effect is weakened due to the excessive rotation angle is avoided. The rotation amplitude of the first rotor 14 with respect to the stator 13 in the direction of the rotation axis 121 of the rotating shaft 12 can be achieved by the above-mentioned limit part 145 and limit groove 133 cooperating.

Optionally, referring to fig. 11, the coil 131 may include at least one sub-coil 1311 surrounding in a direction perpendicular to the rotation axis 121 of the rotating shaft 12, and the sub-coil 1311 includes a first surrounding layer 1312 and a second surrounding layer 1313 stacked around the rotation axis 121 of the first surrounding layer 1312 and disposed around the periphery of the first surrounding layer 1312. The sub-coil 1311 is designed to include a plurality of stacked surrounding layers, so that the magnetic field strength generated at the sub-coil can be enhanced under the condition of saving the volume, and the service performance of the motor 1 is improved. It should be noted that, the sub-coil 1311 is not limited to only include two surrounding layers, namely, the first surrounding layer 1312 and the second surrounding layer 1313, but may also include a third surrounding layer, a fourth surrounding layer, and so on, which are not described herein.

Optionally, referring to fig. 2 to 4 again, the motor 1 may further include a bearing 17, where the bearing 17 is connected between the second rotor 15 and the rotating shaft 12, so as to reduce friction loss when the second rotor 15 moves. The bearings 17 may be oil-impregnated bearings.

Alternatively, the housing 11 of the motor 1 may include a mounting cavity and at least one opening 111 communicating with the mounting cavity, and the stator 13, the first rotor 14, and the second rotor 15 may be located in the mounting cavity. One end of the rotating shaft 12 is located in the mounting cavity, and the other end is located outside the housing 11, so as to improve the air tightness of the motor 1 and avoid oil leakage at the oil-containing bearing, and the motor 1 may further include an end cover 18 sealing the opening 111. Wherein, the interior of the oil-containing bearing is provided with a plurality of extremely fine gaps, and the oil in the oil-containing bearing generally cannot run out under the capillary action generated by the gaps; and even if the oil in the oil-containing bearing escapes, the end cap 18 can also seal the oil from leaking.

Alternatively, referring to fig. 8 to 10, the stator 13 is disposed around the outer periphery of the first rotor 14 in the direction of the rotation axis 121 of the rotating shaft 12, and/or the stator 13 is disposed around the outer periphery of the second rotor 15 in the direction of the rotation axis 121 of the rotating shaft 12, and the inner wall surface of the stator 13 is provided with a groove 134 in the direction parallel to the rotation axis 121. The grooves 134 are provided on the inner wall surface of the stator 13, so that when the first rotor 14 rotates and/or the second rotor 15 rotates, gas can be rapidly discharged through the grooves 134 without causing a large obstruction to the operation of the first rotor 14 or the second rotor 15 due to a small air gap. Further alternatively, the first web 1321 and/or the second web 1322 may have a groove 134 disposed thereon.

It should be noted that, if the oil in the oil-containing bearing runs out, the groove 134 may also have an effect of storing at least a portion of the oil, so as to reduce the influence of the leaked oil on the second rotor 15.

Optionally, referring to fig. 12, the motor 1 may further include a second elastic member 19, where the second elastic member 19 connects the stator 13 and the first rotor 14. Further, the second elastic member 19 may include two first elastic pieces 191 distributed on two opposite sides of the rotating shaft 12, where each first elastic piece 191 is connected to the first rotor 14 and the stator 13, respectively. Alternatively, referring to fig. 12 and 13, the first elastic piece 191 may have a substantially U-shaped structure, and two ends of the first elastic piece 191 may be respectively inserted into the stator 13 and the first rotor 14 to achieve connection with the stator 13 and the first rotor 14.

Optionally, the motor 1 may further include a third elastic member 20, where the third elastic member 20 connects the stator 13 and the second rotor 15. Further, the third elastic member 20 may include two second elastic pieces 201 distributed on two opposite sides of the rotating shaft 12, where each second elastic piece 201 is connected to the second rotor 15 and the stator 13, respectively. Alternatively, the second elastic piece 201 may have a substantially U-shaped structure, and two ends of the second elastic piece 201 may be respectively inserted into the stator 13 and the second rotor 15 to achieve connection with the stator 13 and the second rotor 15.

The embodiment of the application also provides an electric toothbrush. The electric toothbrush comprises a shell, a mounting bracket and a motor 1, wherein the mounting bracket is arranged in the shell; the motor 1 is located in the casing and is mounted on the mounting bracket, and a portion of the rotating shaft 12 of the motor 1 extends out of the casing.

The foregoing disclosure is illustrative of the present application and is not to be construed as limiting the scope of the application, which is defined by the appended claims.

Claims

1. An electric machine, comprising:

a housing;

a stator connected to the housing;

a second rotor located within the housing;

2. The motor of claim 1, wherein the motor comprises a plurality of the first rotors and/or the motor comprises a plurality of the second rotors,

wherein the first elastic member is connected between the first rotor and the second rotor adjacent to the first rotor.

3. The motor of claim 1, wherein the first elastic member comprises a middle section, a first connecting section and a second connecting section positioned at two ends of the middle section, the first connecting section is connected with the first rotor, the second connecting section is connected with the second rotor, and the middle section is positioned between the first rotor and the second rotor and is spaced from the first rotor and the second rotor.

4. The motor of claim 1, wherein the first elastic member includes a middle section, and first and second connection sections at both ends of the middle section, the first rotor includes a first portion and a second portion disposed along a radial direction of the rotation shaft, the second portion is disposed at a side of the first portion away from a rotation axis of the rotation shaft, the second rotor includes a third portion and a fourth portion disposed along the radial direction of the rotation shaft, the fourth portion is disposed at a side of the third portion away from the rotation axis, the first connection section connects the second portion, and the second connection section connects the fourth portion.

5. The motor of claim 1, wherein the first elastic member has a first end portion connected to the first rotor and a second end portion connected to the second rotor, a projection of the first end portion on a first plane being a first projection, a projection of the second end portion on the first plane being a second projection, a projection of a rotation axis of the rotating shaft on the first plane being a third projection, the first projection and the second projection being central symmetry with respect to the third projection, and the first plane being perpendicular to the rotation axis.

6. The motor of claim 1, wherein the first elastic member comprises a middle section and first and second connecting sections positioned at both ends of the middle section,

the first connecting section extends along a direction parallel to the rotation axis of the rotating shaft and is connected with the first rotor; and/or, the second connecting section extends along a direction parallel to the rotation axis of the rotating shaft and is connected with the second rotor.

7. The motor of claim 1, wherein the motor comprises a motor housing,

the first rotor is provided with a first mounting groove, and one end of the first elastic piece is mounted in the first mounting groove; and/or the number of the groups of groups,

The second rotor is provided with a second mounting groove, and the other end of the first elastic piece is mounted in the second mounting groove.

8. The motor of claim 1, wherein the first resilient member comprises:

the first arc-shaped section is arranged outside the rotating shaft along the direction of the rotating axis of the rotating shaft;

one end of each second arc-shaped section is connected with one end of each first arc-shaped section respectively;

one end of each third arc-shaped section is connected with one end of one second arc-shaped section far away from the first arc-shaped section, and the other end of each third arc-shaped section is connected with the first rotor and the second rotor;

each second arc-shaped section is convexly arranged in a direction away from the first arc-shaped section, and each third arc-shaped section is convexly arranged in a direction away from the corresponding second arc-shaped section.

9. The electric machine of claim 1, wherein a region of the stator corresponding to the first rotor is configured to generate a first magnetic field, the first rotor configured to generate a second magnetic field coupled to the first magnetic field such that the first rotor is movable relative to the stator.

10. The electric machine of claim 9, wherein the stator comprises a coil for generating the first magnetic field when energized, the first rotor comprising a first magnetic member for generating the second magnetic field; or (b)

The stator includes a first magnetic member for generating the first magnetic field, and the first rotor includes a coil for generating the second magnetic field when energized.

11. The electric machine of claim 9, wherein a region of the stator corresponding to the second rotor is configured to generate a third magnetic field, the second rotor is configured to generate a fourth magnetic field coupled to the third magnetic field such that the second rotor is movable relative to the stator;

wherein one of the magnetic field line directions of the first magnetic field and the third magnetic field, and the magnetic field line direction of the second magnetic field and the magnetic field line direction of the fourth magnetic field is opposite, so that the movement direction of the second rotor is opposite to the movement direction of the first rotor.

12. The motor of claim 11, wherein the motor comprises a motor rotor,

the stator includes a coil for generating the first magnetic field and the third magnetic field when energized;

The first rotor comprises a first magnetic member for generating the second magnetic field;

the second rotor comprises a second magnetic element for generating the fourth magnetic field;

the magnetic force line direction of the first magnetic field is the same as the magnetic force line direction of the third magnetic field, and the magnetic force line direction of the second magnetic field is opposite to the magnetic force line direction of the fourth magnetic field.

13. The motor of claim 12, wherein the first magnetic member includes a first magnet and a second magnet disposed at intervals along a circumferential direction of the rotating shaft, and the first magnet and the second magnet each extend along a length direction of the rotating shaft, the first magnet including a first sub-portion near a rotation axis of the rotating shaft and a second sub-portion distant from the rotation axis, the first sub-portion and the second sub-portion having opposite polarities; the second magnet comprises a third sub-part close to the rotation axis and a fourth sub-part far away from the rotation axis, the polarities of the third sub-part and the fourth sub-part are opposite, and the polarities of the second sub-part and the fourth sub-part are opposite;

the second magnetic piece comprises a third magnet and a fourth magnet which are arranged at intervals along the circumferential direction of the rotating shaft, the third magnet and the fourth magnet extend along the length direction of the rotating shaft, the third magnet comprises a fifth sub-part close to the rotating axis and a sixth sub-part far away from the rotating axis, and the polarities of the fifth sub-part and the sixth sub-part are opposite; the fourth magnet comprises a seventh sub-portion close to the rotation axis and an eighth sub-portion far away from the rotation axis, the seventh sub-portion and the eighth sub-portion are opposite in polarity, and the sixth sub-portion and the eighth sub-portion are opposite in polarity;

Wherein the third magnet is disposed in correspondence with the first magnet, and the sixth sub-portion of the third magnet is opposite in polarity to the second sub-portion of the first magnet; the fourth magnet is arranged corresponding to the second magnet, and the eighth sub-portion of the fourth magnet is opposite to the fourth sub-portion of the second magnet in polarity.

14. The motor of claim 12, wherein the first rotor includes a plurality of the first magnetic members arranged at intervals along a circumferential direction of the rotating shaft, the second rotor includes a plurality of the second magnetic members equal in number to the first magnetic members, and each of the second magnetic members is arranged corresponding to one of the first magnetic members.

15. The motor of claim 10, wherein said coil includes more than two sub-coils spaced apart along a circumference of said shaft, each of said sub-coils being surrounded in a direction perpendicular to a rotational axis of said shaft, said first magnetic member being located between adjacent two of said sub-coils.

16. The motor of claim 10, wherein one of the stator and the first rotor including the coil further includes a mounting portion for mounting the coil, the mounting portion including:

A first connection plate;

the second connecting plate, with first connecting plate is followed the circumference of pivot distributes, the coil includes along first sub-coil and the second sub-coil of the circumference interval setting of pivot, first sub-coil with the second sub-coil is all along the perpendicular to the axis of rotation direction of pivot encircles, first sub-coil is located the one end of first connecting plate and cover are located first connecting plate reaches the second connecting plate, the second sub-coil is located the other end of first connecting plate and cover are located first connecting plate reaches the second connecting plate.

17. The motor of claim 10, wherein the coil includes at least one sub-coil surrounding in a direction perpendicular to a rotation axis of the rotating shaft, the sub-coil including a first surrounding layer and a second surrounding layer stacked around the rotation axis of the first surrounding layer at a periphery of the first surrounding layer.

18. The motor of claim 1, wherein one of the stator and the first rotor is provided with a limit portion, the other of the stator and the first rotor is provided with a limit slot, and the limit portion is located in and movable within the limit slot.

19. The motor of claim 1, further comprising:

the bearing is connected between the second rotor and the rotating shaft; the stator is arranged around the periphery of the first rotor in a surrounding manner along the rotating axis direction of the rotating shaft, and/or the stator is arranged around the periphery of the second rotor in a surrounding manner along the rotating axis direction of the rotating shaft, and grooves which are parallel to the rotating axis direction are formed in the inner wall surface of the stator.

20. The motor of claim 1, further comprising:

the second elastic piece is connected with the stator and the first rotor; and/or

And the third elastic piece is connected with the stator and the second rotor.

21. An electric toothbrush, comprising:

a housing;

the mounting bracket is arranged in the shell;

the motor of any one of claims 1 to 20, located within the housing and mounted to the mounting bracket, a portion of the shaft of the motor extending out of the housing.