Vibrating motor and electric toothbrush

Abstract

The application discloses a vibrating motor and an electric toothbrush, and relates to the technical field of vibrating motor structures. The vibrating motor comprises a stator and a rotor, the rotor is arranged in the stator, the tooth part of the stator comprises a pole body and a pole shoe, the end face of the pole shoe away from the pole body is a magnetic conduction end face, and the magnetic conduction end face is a curved surface protruding outward to the rotor. The vibrating motor and the electric toothbrush have the characteristics that the magnetic flux of the stator is high, the utilization rate of the magnetic element is high, and the torque and the working efficiency of the motor are high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration motor structure, in particular to a vibration motor and an electric toothbrush. BACKGROUND

[0002] With the improvement of people's living quality, more and more people pay attention to oral health, and electric toothbrushes are also increasingly used in family life.

[0003] At present, the electric toothbrush is driven by the electric motor to move the brush head, such as the rotary electric toothbrush and the vibration electric toothbrush. In the existing vibration motor, the magnetic flux of the stator tooth is low, and the effective utilization rate of the magnet is low.

[0004] Therefore, it is particularly important to develop and design a vibration motor and an electric toothbrush which can solve the above technical problems. SUMMARY

[0005] The present application aims to provide a vibration motor with high magnetic flux of the stator, high utilization rate of the magnetic member, high torque and high working efficiency of the motor.

[0006] Another object of the present application is to provide an electric toothbrush with high magnetic flux of the stator, high utilization rate of the magnetic member, high torque and high working efficiency of the motor.

[0007] The present application provides a technical solution:

[0008] In a first aspect, the present application provides a vibration motor, comprising a stator and a rotor, wherein the rotor is arranged in the stator; the tooth part of the stator comprises a pole body and a pole shoe, the end face of the pole shoe away from the pole body is a magnetic conducting end face, and the magnetic conducting end face is a curved surface protruding outward to the rotor.

[0009] In a first implementation manner of the first aspect, the magnetic conducting end face is projected as a circular arc on a plane perpendicular to the stator axis, and the center of the circular arc is located on the symmetry plane in the extension direction of the pole body.

[0010] In a second implementation manner of the first aspect, in the width direction of the pole shoe, the ratio of the distance between the two ends of the pole shoe to the distance between the two ends of the pole body is less than 1.3.

[0011] With reference to the first aspect and the implementation forms thereof, in a third implementation form of the first aspect, the magnetic conductive end face has an edge line, a distance between the edge line and the central cylindrical surface in the extension direction of the pole body is 0.2mm to 0.35mm, the edge line is an edge of the magnetic conductive end face in the width direction, the axis of the central cylindrical surface coincides with the axis of the stator, and the central cylindrical surface is tangent to the magnetic conductive end face.

[0012] With reference to the first aspect and the implementation forms thereof, in a fourth implementation form of the first aspect, the rotor comprises a swing iron core and a swing magnet, the swing iron core is provided with a mounting groove for mounting the swing magnet, the swing magnet is mounted in the mounting groove, and the rotation axis of the swing iron core coincides with the axis of the stator; an end face of the swing magnet close to the pole shoe is a swing end face, and the swing end face is projected as a circular arc on a plane perpendicular to the axis of the stator, and the center of the circular arc is located at the center of the stator.

[0013] With reference to the first aspect and the implementation forms thereof, in a fifth implementation form of the first aspect, when the swing end face is opposite to the magnetic conductive end face, the ratio of the first air gap distance to the second air gap distance is 1.7 to 2; the first air gap distance is the distance between the edge of the magnetic conductive end face in the width direction and the swing end face in the extension direction of the pole body, and the second air gap distance is the minimum distance between the magnetic conductive end face and the swing end face.

[0014] With reference to the first aspect and the implementation forms thereof, in a sixth implementation form of the first aspect, the stator has two oppositely arranged pole bodies, the swing iron core is provided with two mounting grooves on each side face opposite to the pole body, and the number of swing magnets is four, and the four mounting grooves are symmetrically arranged on the side face of the swing iron core; when the swing iron core swings to the maximum swing amplitude to any one of the two swing end faces opposite to the pole body, the extension direction of the pole body is opposite to the edge of the other swing end face, the edge is located in the width direction of the swing end face and close to the middle part of the swing iron core.

[0015] With reference to the first aspect and the implementation forms thereof, in a seventh implementation form of the first aspect, the cross section of the swing magnet is a quadrilateral with rounded corners, one side and the opposite side of the outer edge of the rotor are circular arcs, and the centers of the circular arcs are located on the symmetry plane in the extension direction of the pole body, and the other two sides extend in the extension direction of the pole body.

[0016] In a seventh implementation form of the first aspect and the above-mentioned implementation forms of the first aspect, the swing magnet has a cross section in the shape of a quadrilateral with rounded corners, and a length of one side of the outer edge of the rotor is greater than a length of another side opposite to the one side.

[0017] In a second aspect, an embodiment of the present application provides an electric toothbrush, comprising the vibration motor. The vibration motor comprises a stator and a rotor, the rotor is arranged in the stator; a tooth portion of the stator comprises a pole body and a pole shoe, an end face of the pole shoe away from the pole body is a magnetic conductive end face, and the magnetic conductive end face is a curved surface protruding outwardly to the rotor.

[0018] Compared with the prior art, the vibration motor and the electric toothbrush provided by the embodiment of the present application have the following beneficial effects:

[0019] The rotor is arranged in the stator, and the tooth portion of the stator comprises a pole body and a pole shoe, an end face of the pole shoe away from the tooth portion is a magnetic conductive end face, and the magnetic conductive end face is a curved surface protruding outwardly to the rotor. In this way, the width of the pole body near the rotor is increased by arranging the pole shoe, that is, the area of the part of the tooth portion relative to the rotor is increased, so that more magnetic induction lines pass through the pole body, the magnetic circuit structure is optimized, and the magnetic conductive end face protruding outwardly to the rotor is arranged, so that the magnetic induction lines further pass through the pole body, the magnetic circuit structure of the vibration motor is further optimized, the utilization rate of the magnet is increased, the torsion is increased, and the working efficiency is improved.

[0020] In order to make the above-mentioned purpose, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without paying creative labor on the basis of these drawings.

[0022] Figure 1 The structure schematic diagram of the vibration motor provided by the embodiment of the present application applied to the electric toothbrush.

[0023] Figure 2 The structure schematic diagram of the vibration motor provided by the embodiment of the present application when not working.

[0024] Figure 3 The structure schematic diagram of part of the stator of the vibration motor provided by the embodiment of the present application.

[0025] Figure 4The structural schematic view of the vibration motor provided by the embodiment of the present application when the rotor rotates to the maximum swing position.

[0026] Figure 5 The structural schematic view of another structure of the vibration motor provided by the embodiment of the present application.

[0027] Figure 6 The magnetic line distribution schematic view of the existing vibration motor at the maximum swing position.

[0028] Figure 7 The magnetic line distribution schematic view of the vibration motor provided by the embodiment of the present application at the maximum swing position.

[0029] Figure 8 The magnetic line distribution schematic view of another structure of the vibration motor provided by the embodiment of the present application at the maximum swing position.

[0030] Figure 9 The torque comparison chart of the vibration motor provided by the embodiment of the present application, another structure of the vibration motor and the existing vibration motor at the swing position.

[0031] Figure 10 The current comparison chart of the vibration motor provided by the embodiment of the present application, another structure of the vibration motor and the existing vibration motor at the swing position.

[0032] Icon: 100-electric toothbrush; 20-brush head; 30-brush handle; 10-vibration motor; 12-stator; 121-yoke; 122-tooth part; 123-pole body; 124-pole shoe; 125-magnetic conduction end face; 126-center cylindrical surface; 15-rotor; 151-swinging iron core; 1513-mounting groove; 152-swinging magnet; 153-swinging end face; 155-swinging top. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] It should be noted that similar reference numerals and letters refer to like items in the accompanying drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings. The terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. The terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0035] It should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0037] Embodiment:

[0038] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the vibration motor 10 provided by the embodiment of the present application is applied to the electric toothbrush 100.

[0039] The embodiment of the present application provides a vibration motor 10, the magnetic flux of the stator 12 of the vibration motor 10 is high, and the vibration motor 10 has the characteristics of high utilization rate of magnetic parts, high torque and high working efficiency of the motor. The vibration motor 10 can be applied to the electric toothbrush 100, mobile phone, electronic watch, hair removal instrument, beauty instrument, skin tenderizing instrument and oral irrigator and other scenes needing vibration, of course, the vibration motor 10 can also be used independently.

[0040] The vibration motor 10 is applied to the electric toothbrush 100, which comprises the vibration motor 10, a brush head 20 and a brush handle 30. The vibration motor 10 is installed on the brush handle 30 and is in transmission connection with the brush head 20 to drive the brush head 20 to vibrate and complete the tooth brushing action.

[0041] The electric toothbrush 100 has the characteristics of high magnetic flux of the stator 12, high utilization of the magnetic member, high torque and high working efficiency of the motor.

[0042] The structure, working principle and beneficial effects of the vibration motor 10 will be described below.

[0043] Please refer to Figure 2 , Figure 2 The vibration motor 10 provided by the embodiment of the present application is shown in the structure diagram when it is not working.

[0044] The vibration motor 10 comprises a stator 12 and a rotor 15. The magnetic induction lines pass through the stator 12, the rotor 15 and then return to the stator 12 to drive the rotor 15 to rotate. The structure of the stator 12 and the rotor 15 is optimized to increase the magnetic flux of the tooth portion 122 of the stator 12 and improve the utilization of the magnetic member.

[0045] The rotor 15 is arranged in the stator 12. The tooth portion 122 of the stator 12 comprises a pole body 123 and a pole shoe 124. The end face of the pole shoe 124 away from the pole body 123 is a magnetic guide end face 125. The magnetic guide end face 125 is a convex surface outwardly protruding to the rotor 15. In other words, the magnetic guide end face 125 is a convex surface and protrudes to the rotor 15.

[0046] In this way, the width of the pole body 123 close to the rotor 15 is increased by arranging the pole shoe 124, that is, the area of the portion of the tooth portion 122 relative to the rotor 15 is increased, so that more magnetic induction lines pass through the pole body 123 and the magnetic induction lines extending along the pole body 123 are increased. The magnetic circuit structure is optimized. The magnetic guide end face 125 outwardly protruding to the rotor 15 is arranged to further make more magnetic induction lines pass through the pole body 123. The magnetic circuit structure of the vibration motor 10 is further optimized, the utilization of the magnetic member is improved, the torque of the vibration motor 10 is increased and the working efficiency is improved.

[0047] Further, the magnetic conductive end surface 125 is projected as a circular arc on a plane perpendicular to the axis of the stator 12, and the center of the circular arc is located on the symmetry plane in the extending direction of the pole body 123. The plane perpendicular to the axis of the stator 12 is the cross section in the radial direction of the stator 12, and on the cross section of the pole shoe 124, the magnetic conductive end surface 125 is in the shape of a circular arc, and the center of the circular arc is located on the symmetry plane of the pole body 123. The symmetry plane is such that the pole body 123 is symmetrical about the symmetry plane, and the axis of the stator 12 is located on the symmetry plane, or in other words, the extending direction of the pole body 123 is located on the symmetry plane.

[0048] In this way, the magnetic conductive end surface 125 of the pole shoe 124 is tangent to the central cylindrical surface 126 of the stator 12, wherein the central cylindrical surface 126 of the stator 12 is a virtual cylindrical surface, the axis of the central cylindrical surface 126 coincides with the axis of the stator 12, and intersects with the magnetic conductive end surface 125. When the magnetic conductive end surface 125 protrudes outwardly from the rotor 15, and the center is located on the symmetry plane of the pole body 123, the central cylindrical surface 126 is tangent to the magnetic conductive cylindrical surface. In other words, the magnetic conductive end surface 125 is directly opposite the axis of the rotor 15, further causing more magnetic induction lines to pass through the pole body 123, further optimizing the magnetic circuit structure of the vibration motor 10, and enabling the rotor 15 to swing more stably.

[0049] Please refer to Figure 3 , Figure 3 The structure schematic diagram of part of the stator 12 of the vibration motor 10 provided by the embodiment of the present application is shown in the figure. The direction of the arrow to the left is the width direction of the pole shoe 124, and the direction of the arrow downward is the extending direction of the pole body 123.

[0050] In the embodiment, the width of the pole shoe 124 is b, the width of the pole body 123 is a, and the ratio of the width of the pole shoe 124 to the width of the pole body 123 is less than 1.3, that is to say:

[0051] b / a<1.3

[0052] It should be noted that the width of the pole shoe 124 and the width of the pole body 123 are both the distance between the two ends in the width direction of the pole shoe 124.

[0053] The above ratio range is the result of structural optimization, in order to increase the number of magnetic induction lines passing through the pole body 123 and the utilization rate of the magnet, and to increase the magnetic flux of the pole body 123.

[0054] Further, the distance between the edge line of the magnetic conduction end face 125 and the central cylindrical surface 126 in the extension direction of the pole body 123 is c, and c is in the range of 0.2mm to 0.35mm, wherein the edge line is an edge of the magnetic conduction end face 125 in the width direction, in other words, the air gap distance at this position is in the range of 0.2mm to 0.35mm, and this distance range is the result of structural optimization to improve the magnetic utilization of the magnet and increase the magnetic flux of the pole body 123.

[0055] Please continue to refer to Figure 2 The rotor 15 includes a swing core 151 and a swing magnet 152, the swing core 151 is provided with a mounting groove 1513, and the swing magnet 152 is mounted in the mounting groove 1513 on the swing core 151, and the rotation axis of the swing core 151 coincides with the axis of the stator 12, wherein the end face of the swing magnet 152 away from the swing core 151 is a swing end face 153, that is, the side of the swing magnet 152 facing the inner wall of the yoke 121 is the swing end face 153, or in other words, the end face of the swing magnet 152 close to the pole shoe 124 is the swing end face 153, and the swing end face 153 is an outward convex curved surface. So that the magnetic induction lines can pass through the pole body 123 more, increasing the magnetic flux of the pole body 123.

[0056] Further, the swing end face 153 is projected as a circular arc on a plane perpendicular to the axis of the stator 12, and the center of the circular arc is located at the center of the stator 12. That is, the swing end face 153 is a circular arc on the cross section of the swing magnet 152, and the center of the circular arc is the center of the rotor 15, so that when the rotor 15 swings, the magnetic induction lines passing through the swing end face 153 pass through the pole body 123 more, optimizing the magnetic circuit structure of the vibration motor 10.

[0057] Please refer to Figure 4 , Figure 4 The structure schematic diagram of the vibration motor 10 provided by the embodiment of the present application when the rotor 15 rotates to the maximum swing position is shown in the figure. The direction of the arrow to the left is the width direction of the pole shoe 124, and the direction of the arrow downward is the extension direction of the pole body 123.

[0058] And, Figure 4 d in the formula is the second air gap distance, and e is the first air gap distance, wherein the first air gap distance is the distance between the edge of the magnetic conduction end face 125 in the width direction and the swing end face 153 in the extension direction of the pole body 123, and the second air gap distance is the minimum distance between the magnetic conduction end face 125 and the swing end face 153, that is, the distance from the bottom end of the magnetic conduction end face 125 to the top end of the swing end face 153 when the swing end face 153 and the magnetic conduction end face 125 are opposite.

[0059] And when the swing end face 153 and the magnetic conduction end face 125 are opposite, the ratio of the first air gap distance to the second air gap distance is in the range of 1.7 to 2, that is:

[0060] 1.7<e / d<2

[0061] The above ratio range is the structure optimization result, so as to improve the utilization of the magnet and the magnetic flux of the pole body 123.

[0062] Further, the stator 12 has two oppositely arranged pole bodies 123, and the two sides of the swing core 151 opposite to the pole bodies 123 are each provided with two mounting grooves 1513, that is, four mounting grooves 1513 are provided on the swing core 151, and the number of the swing magnets 152 is four, and the four mounting grooves 1513 are symmetrically provided on the side surface of the swing core 151.

[0063] And when the swing core 151 swings to any one of the two swing end surfaces 153 opposite to one pole body 123 and swings to the maximum swing position, the symmetry plane in the extension direction of the pole body 123 will be opposite to the edge of the other swing end surface 153, and the edge is the edge located in the width direction of the swing end surface 153 and close to the middle of the swing core 151. In other words, the above edge is the swing top 155, which is the edge located in the two swing end surfaces 153 on the same side of the swing core 151 and close to the middle of the swing core 151.

[0064] As Figure 4 During the maximum swing process from the left side to the right side on the upper side of the swing core 151, the symmetry plane in the extension direction of the upper pole body 123 passes through the right swing top 155, and at the maximum swing, the swing top 155 of the left swing end surface 153 is located on the symmetry plane in the extension direction of the pole body 123, and the bottom center point of the magnetic conduction end surface 125 is opposite to the left swing top 155.

[0065] In this way, when the swing core 151 swings to the maximum swing, more magnetic induction lines pass through the pole body 123, so as to optimize the magnetic circuit structure and improve the utilization of the magnet.

[0066] It should be noted that in the embodiment, the angle of the maximum swing is eight degrees, and in other embodiments, the angle of the maximum swing can also be other degrees.

[0067] Please continue to refer to Figure 4 The cross section of the swing magnet 152 is a quadrilateral with rounded corners, and the rounded corners are provided to make the magnetic induction lines more dispersed, so that more magnetic induction lines pass through the pole body 123, thereby improving the utilization of the magnet.

[0068] And, one side of the outer edge of the rotor 15 and the other side opposite to it are circular arcs, and the centers of the circular arcs are located on the symmetry plane in the extension direction of the pole body 123, in other words, one side corresponding to the swing end face 153 and one side corresponding to the one side are circular arcs, and the centers of the circular arcs are located on the symmetry plane in the extension direction of the pole body 123, in other words, one side opposite to the swing end face 153 is deviated from the curved surface of the swing core 151, so that the magnetic induction lines can be better distributed along the swing core 151.

[0069] In addition, the other two sides of the quadrilateral extend along the extension direction of the pole body 123.

[0070] Please refer to Figure 5 , Figure 5 The structure diagram of another structure of the vibration motor 10 provided by the embodiment of the present application is shown.

[0071] The swing magnet 152 can also be another shape, and the cross section is also a quadrilateral with rounded corners, and the length of one side of the outer edge of the rotor 15 is greater than the length of the other side opposite to it, which is approximately a fan shape, which also makes the magnetic induction lines better distributed along the swing core 151.

[0072] Please refer to Figure 6 , Figure 6 The magnetic field line distribution diagram of the existing vibration motor 10 at the maximum swing amplitude is shown.

[0073] In which, the magnetic induction lines pass through the tooth part 122 less, so that the utilization rate of the magnet is lower, and the distribution of the magnetic induction lines on the swing core 151 is denser and shorter.

[0074] Please refer to Figure 7 and Figure 8 , Figure 7 The magnetic field line distribution diagram of the vibration motor 10 provided by the embodiment of the present application at the maximum swing amplitude is shown. Figure 8 The magnetic field line distribution diagram of another structure of the vibration motor 10 provided by the embodiment of the present application at the maximum swing amplitude is shown.

[0075] Compared with the magnetic field line distribution of the existing vibration motor 10 at the maximum swing amplitude, the magnetic induction line distribution of the two swing magnets of the vibration motor 10 provided by the embodiment is more uniform, and the magnetic induction lines passing through the pole body 123 are more.

[0076] Please refer to Figure 9 and Figure 10 , Figure 9 The torque comparison diagram of the vibration motor 10 provided by the embodiment of the present application, another structure of the vibration motor 10 and the existing vibration motor 10 when swinging is shown. Figure 10 The current comparison diagram of the vibration motor 10 provided by the embodiment of the present application, another structure of the vibration motor 10 and the existing vibration motor 10 when swinging is shown.

[0077] Figure 9 In the figure, the ordinate is torque, with units of mN.m (milli-newton-meter), and the abscissa is the oscillation period, with units of s (seconds).

[0078] In the figure, the ordinate is torque, with units of mN.m (milli-newton-meter), and the abscissa is the oscillation period, with units of s (seconds).

[0079] Figure 10 In the figure, the ordinate is current, with units of mA (milli-ampere), and the abscissa is the oscillation period, with units of s (seconds).

[0080] In the figure, the ordinate is current, with units of mA (milli-ampere), and the abscissa is the oscillation period, with units of s (seconds).

[0081] The working principle of the vibration motor 10 provided by the embodiment of the present application is as follows:

[0082] The rotor 15 is arranged in the stator 12, and the tooth portion 122 of the stator 12 comprises a pole body 123 and a pole shoe 124. The end face of the pole shoe 124 away from the tooth portion 122 is a magnetic conduction end face 125, and the magnetic conduction end face 125 is a curved surface protruding outwardly to the rotor 15. In other words, the magnetic conduction end face 125 is a convex curved surface, and it protrudes towards the rotor 15. In this way, by arranging the pole shoe 124, the width of the end of the pole body 123 away from the yoke 121 of the stator 12 is increased, that is, the area of the part of the tooth portion 122 relative to the rotor 15 is increased, so that more magnetic induction lines pass through the pole body 123, and the magnetic circuit structure is optimized. Furthermore, by arranging the magnetic conduction end face 125 protruding outwardly to the rotor 15, the magnetic induction lines further pass through the pole body 123, and the magnetic circuit structure of the vibration motor 10 is further optimized, the utilization rate of the magnet is increased, the torsion is increased, and the working efficiency is improved.

[0083] In summary:

[0084] The embodiment of the present application provides a vibration motor 10, the magnetic flux of the stator 12 is high, and the motor has the characteristics of high utilization rate of magnetic parts, high torque and high working efficiency.

[0085] The above merely provides the preferred embodiments of the present application but is not intended to limit the present application. Obviously, the above-mentioned features in the embodiments can be combined with each other without conflict, and the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. Moreover, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all the changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. A vibration motor, characterized by, The vibration motor comprises a stator and a rotor, and the rotor is arranged in the stator. The tooth part of the stator comprises a pole body and a pole shoe, an end face of the pole shoe away from the pole body is a magnetic conductive end face, and the magnetic conductive end face is a curved surface protruding outwardly towards the rotor. The rotor comprises a swing core and a swing magnet, the swing core is provided with a mounting groove for mounting the swing magnet, the swing magnet is mounted in the mounting groove, and the rotation axis of the swing core coincides with the axis of the stator. An end face of the swing magnet close to the pole shoe is a swing end face, and the swing end face is projected as a circular arc on a plane perpendicular to the axis of the stator, and the center of the circular arc is located at the center of the stator. The magnetic conductive end face has an edge line, the distance between the edge line and a central cylindrical surface in the extension direction of the pole body is 0.2mm to 0.35mm, wherein the edge line is an edge of the magnetic conductive end face in the width direction, the axis of the central cylindrical surface coincides with the axis of the stator, and is tangent to the magnetic conductive end face. When the swing end face is opposite to the magnetic conductive end face, the ratio of the first air gap distance to the second air gap distance is 1.7 to 2. The first air gap distance is the distance between the edge of the magnetic conductive end face in the width direction and the swing end face in the extension direction of the pole body, and the second air gap distance is the minimum distance between the magnetic conductive end face and the swing end face.

2. The vibrating motor of claim 1, wherein The magnetic conductive end face is projected as a circular arc on a plane perpendicular to the axis of the stator, and the center of the circular arc is located at the extension direction of the pole body.

3. The vibrating motor of claim 1, wherein In the width direction of the pole shoe, the ratio of the distance between the two ends of the pole shoe to the distance between the two ends of the pole body is less than 1.

3.

4. The vibrating motor of claim 1, wherein The stator has two oppositely arranged pole bodies, the swing core has two mounting grooves arranged on each side surface opposite to the pole body, and the number of swing magnets is four. When the swing core swings to the maximum swing amplitude towards any one of the two swing end faces opposite to the pole body, the extension direction of the pole body is opposite to the edge of the other swing end face, the edge is located in the width direction of the swing end face and close to the middle part of the swing core.

5. The vibrating motor of claim 1, wherein The cross section of the swing magnet is a quadrilateral with rounded corners, one side and the other side opposite to it at the outer edge of the rotor are circular arcs, and the centers of the circular arcs are located at the extension direction of the pole body, and the other two sides extend along the extension direction of the pole body.

6. The vibrating motor of claim 1, wherein The cross section of the swing magnet is a quadrilateral with rounded corners, and the length of one side at the outer edge of the rotor is greater than the length of the other side opposite to it.

7. An electric toothbrush characterized by comprising: The vibration motor comprises the vibration motor according to any one of claims 1 to 6.

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