Electromagnetic drive module with small angle oscillation

Abstract

The present application relates to the technical field of driving device, especially to a small-angle swing electromagnetic driving module, comprising a stator and a rotor, the rotor comprising a rotating shaft, a magnetic conducting assembly and two permanent magnets, the magnetic conducting assembly being arranged on the rotating shaft, the two permanent magnets being arranged on the magnetic conducting assembly at intervals, and the magnetic conducting assembly being provided with a first arc surface; the stator comprising a shell, a coil and a magnetic conducting framework, the magnetic conducting framework and the rotating shaft being arranged in the shell, the magnetic conducting framework being mounted on the shell, the coil being wound on the magnetic conducting framework, the magnetic conducting framework being provided with a second arc surface, and the first arc surface and the second arc surface being arranged with a common center; two pole shoes being arranged in the shell, the pole shoes having inner arc surfaces, and the central angles of the inner arc surfaces corresponding to the permanent magnets being not greater than the swing angle of the permanent magnets. The present application couples the magnetic conducting assembly with the magnetic conducting framework, uses the coil to generate an alternating magnetic field to control the permanent magnets to drive the rotor to swing, and sets the inner arc surface angle of the pole shoes, so as to control the swing range of the permanent magnets to be kept in a required range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of driving devices, in particular to an electromagnetic driving module with small-angle oscillation. BACKGROUND

[0002] At present, some electronic devices usually need to use an oscillating motor to control the corresponding components to oscillate slightly to achieve the desired effect. For example, an electric toothbrush needs to control the brush head to oscillate slightly to improve the cleaning effect, and a rudder needs to control the camera to rotate slightly to capture the picture of the desired position.

[0003] Such electronic devices usually need a small electromagnetic driving device to achieve the desired function. However, the main drawback of the polar electromagnetic iron driven toothbrush in the prior art is the limitation of the oscillation range of the brush. In order to ensure the static stable position of the toothbrush head, simplify the electronic driving circuit and reduce the power consumption, the practical electromagnetic iron structure is difficult to realize large oscillation range operation, and is only suitable for high-speed vibration near the static zero stable position. Although the brushless motor can realize arbitrary rotation in the shutdown state, the amplitude required for electric toothbrushes, drones and other devices is usually not large, which leads to the fact that the function of the brushless motor far exceeds the actual demand. Usually, only one phase drive can meet the requirements. In addition, due to the high cost of brushless motors and the complexity of the driving circuit, the application of brushless motors in such electronic devices will inevitably waste a large part of unnecessary resources.

[0004] Therefore, how to provide a driving module with simple structure and oscillation amplitude that can meet the requirements (such as about ±30°) is a common problem in the industry. SUMMARY

[0005] The present application provides an electromagnetic driving module with small-angle oscillation, which realizes the effect of controlling the oscillation amplitude of the rotor to meet the requirements through the improvement and optimization of the structure.

[0006] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0007] The present application provides an electromagnetic driving module with small-angle oscillation, which includes a stator and a rotor. The rotor includes a rotating shaft, a magnetic guide assembly, and two permanent magnets. The magnetic guide assembly is installed on the rotating shaft, and the two permanent magnets are arranged at intervals on the magnetic guide assembly. The magnetic guide assembly is provided with a first curved surface.

[0008] The stator includes a shell, a Hall sensor, a coil, and a magnetic guide skeleton. The magnetic guide skeleton and the rotating shaft are both arranged in the shell. The magnetic guide skeleton is installed in the shell, and the coil is wound around the magnetic guide skeleton. The magnetic guide skeleton is provided with a second curved surface, and the first curved surface and the second curved surface are arranged with the same center.

[0009] The shell is provided with two pole shoes, the pole shoes have inner arc surfaces, and the central angles corresponding to the inner arc surfaces are not greater than the swing angle of the permanent magnet;

[0010] The Hall sensor is mounted on the shell and is used for sensing the magnetic field change of the permanent magnet to determine the current posture of the rotating shaft.

[0011] Further, the magnetic conducting assembly comprises a plurality of first silicon steel sheets, the plurality of first silicon steel sheets are sequentially stacked, each of the plurality of first silicon steel sheets is provided with a central hole and two mounting grooves, the rotating shaft is riveted in the central hole of the plurality of first silicon steel sheets, and the two permanent magnets are provided in one-to-one correspondence with the two mounting grooves.

[0012] Still further, the inner side wall of the central hole is provided with a plurality of riveting protrusions, the two sides of the mounting groove are respectively provided with limiting protrusions, the riveting protrusions are used for enhancing the output torque and impact resistance of the rotating shaft, and the limiting protrusions are used for preventing the permanent magnet from being separated from the mounting groove.

[0013] Further, the distance between the first arc surface and the second arc surface is not greater than 0.1 mm.

[0014] Further, the shell comprises a first terminal cover, a second terminal cover, a positioning assembly and a plurality of second silicon steel sheets, the plurality of second silicon steel sheets are sequentially stacked through the positioning assembly, the plurality of second silicon steel sheets are arranged between the first terminal cover and the second terminal cover, the second silicon steel sheet has a through hole, the through holes of the plurality of second silicon steel sheets are sequentially communicated to form a containing space, the rotor and the magnetic conducting framework are arranged in the containing space, and the two ends of the rotating shaft are rotatably arranged in the first terminal cover and the second terminal cover.

[0015] Still further, the positioning assembly comprises at least two positioning bars, the second silicon steel sheet is provided with positioning holes in the same number as the positioning bars, and the positioning bars and the positioning holes are arranged in one-to-one correspondence.

[0016] Still further, the pole shoe is arranged in the containing space, one end of the pole shoe is connected with the second silicon steel sheet, and the other end of the pole shoe is arranged in suspension; the top of the containing space is further provided with a bracket for mounting the Hall sensor.

[0017] Still further, the pole shoe comprises a main body, a connecting portion and a micro magnetic circuit, the connecting portion is arranged at one end of the main body, the connecting portion is connected with the second silicon steel sheet, the micro magnetic circuit is arranged between the main body and the second silicon steel sheet, and the micro magnetic circuit is arranged in spacing with the connecting portion.

[0018] Further, the magnetic conducting assembly comprises a first insulating plate, a second insulating plate, a plurality of third silicon steel sheets and at least two connecting structures, the plurality of third silicon steel sheets are sequentially stacked through the at least two connecting structures; the third silicon steel sheet comprises a mounting portion, a main body portion and a coupling portion, the main body portion is arranged between the mounting portion and the coupling portion, the first insulating plate and the second insulating plate are sleeved on the main body portion, the first insulating plate abuts against the bottom of the coupling portion, the second insulating plate abuts against the top of the mounting portion, the coil is wound between the first insulating plate and the second insulating plate, and the second arc surface is arranged on the coupling portion.

[0019] The width of the main body portion is less than the width of the coupling portion, and the width of the coupling portion is less than the width of the mounting portion.

[0020] Further, the two sides of the coupling portion are respectively provided with limiting portions for abutting against the permanent magnet and the mounting groove to limit the rotation angle of the rotor twice.

[0021] The present application has the beneficial effects that: the present application utilizes the magnetic conducting assembly and the magnetic conducting framework to be coupled, utilizes the coil to generate the alternating magnetic field to control the permanent magnet to drive the rotor to rotate, utilizes the inner arc surface angle setting of the pole shoe, and reaches the effect that the rotation amplitude of the permanent magnet is controlled to be kept in the required range. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the present application.

[0023] Figure 2 It is an exploded schematic diagram of the present application.

[0024] Figure 3 It is a schematic diagram of the first silicon steel sheet of the present application.

[0025] Figure 4 It is an exploded schematic diagram of the present application after the magnetic conducting framework and the coil of the shell are hidden.

[0026] Figure 5 It is a schematic diagram of the second silicon steel sheet of the present application.

[0027] Figure 6 It is an exploded schematic diagram of the magnetic conducting framework of the present application.

[0028] Figure 7 It is a front view of the present application after the first terminal cover is hidden.

[0029] Reference numerals: 1—Stator, 2—Rotor, 3—Housing, 4—Hall Sensor, 5—Coil, 6—Magnetic Frame, 7—Shaft, 8—Magnetic Assembly, 9—Permanent Magnet, 10—First Silicon Steel Sheet, 31—First Terminal Cover, 32—Second Terminal Cover, 33—Positioning Assembly, 34—Second Silicon Steel Sheet, 60—Second Arc Surface, 61—First Insulating Plate, 62—Second Insulating Plate, 63—Third Silicon Steel Sheet, 64—Connecting Column 80—First arc surface, 101—Central hole, 102—Mounting groove, 103—Riveting protrusion, 104—Limiting protrusion, 331—Positioning strip, 341—Through hole, 342—Positioning hole, 343—Pole shoe, 344—Bracket, 345—Main body, 346—Connecting part, 347—Micromagnetic circuit, 348—Inner arc surface, 631—Mounting part, 632—Main body part, 633—Coupling part, 634—Limiting part. Detailed Implementation

[0030] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0031] like Figures 1 to 7 As shown, the present invention provides a small-angle oscillating electromagnetic drive module, including a stator 1 and a rotor 2. The rotor 2 includes a rotating shaft 7, a magnetic conductive component 8 and two permanent magnets 9. The magnetic conductive component 8 is mounted on the rotating shaft 7, and the two permanent magnets 9 are spaced apart on the magnetic conductive component 8. The magnetic conductive component 8 is provided with a first arc surface 80.

[0032] The stator 1 includes a housing 3, a Hall sensor 4, a coil 5, and a magnetic skeleton 6. The magnetic skeleton 6 and the rotating shaft 7 are both disposed inside the housing 3. The magnetic skeleton 6 is installed in the housing 3. The coil 5 is wound around the magnetic skeleton 6. The magnetic skeleton 6 is provided with a second arc surface 60. The first arc surface 80 and the second arc surface 60 are arranged with the same center.

[0033] The outer casing 3 is provided with two pole shoes 343. The pole shoes 343 have an inner arc surface 348. The central angle corresponding to the inner arc surface 348 is not greater than the swing angle of the permanent magnet 9.

[0034] Hall sensor 4 is mounted on housing 3 and is used to sense changes in the magnetic field of permanent magnet 9 to determine the current attitude of rotating shaft 7.

[0035] In actual use, since the present invention has only one coil 5, only one full-bridge driver is needed to provide positive and negative driving current to the coil 5 to generate an alternating magnetic field; and the permanent magnet 9 will move accordingly under the alternating magnetic field, thereby controlling the rotor 2 to rotate relative to the stator 1 with the required amplitude, thus realizing the oscillation effect.

[0036] The Hall sensor 4 of the present application is inserted into the shell 3 along the direction parallel to the axial direction of the rotor 2, that is, the sensing direction of the Hall sensor 4 is orthogonal to the direction of the driving magnetic field generated by the coil 5, so that the alternating magnetic field generated by the coil 5 hardly changes when it is sensed by the Hall sensor 4, but the permanent magnet 9 of the rotor 2 oscillating due to the action of the alternating magnetic field will move relative to the Hall sensor 4, and the relative movement will change the magnetic field sensed by the Hall sensor 4 due to the changes in the two directions perpendicular to the axial direction of the rotor 2 and parallel to the axial direction of the rotor 2, so that the amplitude of the rotation of the rotor 2 can be determined according to the specific change value.

[0037] For example, in an electric toothbrush, the rotation angle of the shaft is required to be ±30°, at this time, the central angle corresponding to the inner arc surface 348 of the pole shoe 343 can be set to 60±5°, preferably 60°. Therefore, when the permanent magnet 9 is located at the position corresponding to the inner arc surface 348 of the pole shoe 343, the magnetic field generated by the coil 5 can effectively drive the permanent magnet 9 to move; but when one of the permanent magnets 9 rotates to the position about to leave the inner arc surface 348 of the pole shoe 343, the resistance force received by the permanent magnet 9 will be significantly increased, so that the permanent magnet 9 will no longer rotate in this direction, so that the present application can limit the maximum driving range of the rotor 2 by the distribution of the magnetic force.

[0038] For example, when the rotor 2 rotates to +30°, the magnetic field of the pole shoe 343 can effectively stop the rotor 2 from continuing to rotate in the positive direction, thereby achieving the limiting effect and avoiding the collision and wear caused by mechanical limiting.

[0039] And the Hall sensor 4 provides posture feedback of the rotor 2 on this basis: for example, when the rotor 2 needs to rotate to ±25° to reverse, the Hall sensor 4 needs to sense the magnetic force change data of the permanent magnet 9 to realize the specific angle of the rotor 2, thereby realizing the control effect.

[0040] In the present embodiment, the magnetically conductive assembly 8 comprises a plurality of first silicon steel sheets 10, the plurality of first silicon steel sheets 10 are sequentially stacked, each of the plurality of first silicon steel sheets 10 is provided with a center hole 101 and two mounting grooves 102, the shaft 7 is riveted in the center hole 101 of the plurality of first silicon steel sheets 10, and the two permanent magnets 9 are correspondingly arranged with the two mounting grooves 102.

[0041] That is, the magnetically conductive assembly 8 is formed by sequentially stacking a plurality of first silicon steel sheets 10, and then riveting the rotor 2 to the center holes 101 of the plurality of first silicon steel sheets 10, and the permanent magnet 9 is mounted on the first silicon steel sheet 10, so that the first silicon steel sheet 10 is magnetized to make the rotor 2 have a stable magnetic field to meet the driving force required for rotation.

[0042] In actual use, the length of the magnetic conductive assembly 8 is not less than the length of the permanent magnet 9, so that the magnetic conductive assembly 8 can provide accurate angle and radial positioning for the permanent magnet 9, and ensure the transmission of driving torque. The rotating shaft 7R is preferably also made of magnetic conductive material, so as to ensure the magnetic field coupling capability between the stator 1 and the rotating shaft 7R in the case of limited volume of the present application.

[0043] Specifically, the inner side wall of the center hole 101 is provided with a plurality of riveting protrusions 103, and the two sides of the installation groove 102 are respectively provided with limiting protrusions 104. The riveting protrusions 103 are used to enhance the output torque and impact resistance of the rotating shaft 7, and the limiting protrusions 104 are used to prevent the permanent magnet 9 from being separated from the installation groove 102.

[0044] The riveting protrusions 103 are arranged along the inner side wall of the center hole 101, and are used to increase the connection strength between the rotating shaft 7 and the center hole 101 by means of the riveting protrusions 103 abutting against the outer side wall of the rotating shaft 7 under the riveting force when the rotating shaft 7 is riveted to the center hole 101. The rotating shaft 7 is also prevented from "slipping" relative to the first silicon steel sheet 10, so that the magnetic field driving force can more effectively act on the rotating shaft 7, and the output torque is ensured. The permanent magnet 9 is also riveted in the installation groove 102, and the limiting protrusions 104 are used to "clamp" the permanent magnet 9.

[0045] In the embodiment, the distance between the first arc surface 80 and the second arc surface 60 is not greater than 0.1mm, and under this distance, the first arc surface 80 and the second arc surface 60 can be prevented from contacting, and the magnetic field can be most efficiently applied to the rotor 2 under the action of the magnetic field.

[0046] In the embodiment, the shell 3 includes a first terminal cover 31, a second terminal cover 32, a positioning assembly 33, and a plurality of second silicon steel sheets 34. The plurality of second silicon steel sheets 34 are sequentially stacked by the positioning assembly 33. The plurality of second silicon steel sheets 34 are arranged between the first terminal cover 31 and the second terminal cover 32. The second silicon steel sheet 34 has a through hole 341. The through holes 341 of the plurality of second silicon steel sheets 34 are sequentially communicated to form a containing space. The rotor 2 and the magnetic conductive framework 6 are arranged in the containing space. The two ends of the rotating shaft 7 are rotatably arranged in the first terminal cover 31 and the second terminal cover 32.

[0047] Specifically, the plurality of second silicon steel sheets 34 are stacked along the axial direction parallel to the rotating shaft 7, and cooperate with the first terminal cover 31 and the second terminal cover 32 to form the structure of the shell 3. Since the second silicon steel sheet 34 is connected with the magnetic conductive framework 6, the magnetic field generated by the coil 5 can also magnetize the second silicon steel sheet 34, so that the second silicon steel sheet 34 has a magnetic field consistent with the direction of the coil 5, so that the magnetic field is stronger and brings better driving force.

[0048] Specifically, the positioning assembly 33 includes at least two positioning bars 331, the second silicon steel sheet 34 is provided with positioning holes 342 in the same number as the positioning bars 331, and the positioning bars 331 and the positioning holes 342 are arranged one by one. That is, the projections of the plurality of second silicon steel sheets 34 on the plane perpendicular to the shaft 7 axis need to be completely overlapped, and therefore the positioning assembly 33 needs to be used to achieve this. Through actual measurement, the number of positioning bars 331 is at least three, preferably three or four. By inserting the plurality of positioning bars 331 into different positions of the second silicon steel sheet 34, since the position distribution of the positioning holes 342 of each second silicon steel sheet 34 is the same, each positioning bar 331 is inserted into the same position of the positioning hole 342 of each second silicon steel sheet 34, so that the plurality of second silicon steel sheets 34 can be kept in the same attitude, thereby forming the required structure to ensure the stable assembly of the first terminal cover 31 and the second terminal cover 32.

[0049] Specifically, the pole shoe 343 is arranged in the accommodation space, one end of the pole shoe 343 is connected with the second silicon steel sheet 34, and the other end of the pole shoe 343 is arranged in suspension; the top of the accommodation space is further provided with a bracket 344 for mounting the Hall sensor 4.

[0050] The pole shoe 343 needs to not only ensure the angle zero position of the permanent magnet 9, but also ensure the angle driving range of the rotor 2, which is a very important structure. However, during operation, it is usually necessary to apply an initial driving capacity to the rotor 2 near the zero position, and only when the initial balance value is broken, the rotor 2 can be smoothly rotated.

[0051] Based on this problem, the pole shoe 343 includes a main body 345, a connecting portion 346, and a micro magnetic path 347, the connecting portion 346 is arranged at one end of the main body 345, the connecting portion 346 is connected with the second silicon steel sheet 34, the micro magnetic path 347 is arranged between the main body 345 and the second silicon steel sheet 34, and the micro magnetic path 347 is arranged in a spaced manner with the connecting portion 346.

[0052] The arrangement of the micro magnetic path 347 significantly enhances the initial driving capacity of the rotor 2 near the zero position, that is, when the coil 5 is powered on, the micro magnetic path 347 generates an initial driving force due to magnetization, thereby driving the permanent magnet 9 to break through the initial position and rotate; when the current increases, since the width of the micro magnetic path 347 is small, the magnetic saturation state is quickly reached, so that more effective driving magnetic fields are automatically transferred to the main body 632 of the pole shoe 343 to more optimally and reasonably drive the permanent magnet 9 at an angle. That is, the magnetic fields of the micro magnetic path 347 after saturation are the overall magnetic fields of each other, which do not cause excessive interference to the subsequent driving of the permanent magnet 9.

[0053] In the embodiment, the magnetic conducting assembly comprises a first insulating plate 61, a second insulating plate 62, a plurality of third silicon steel sheets 63, and at least two connecting structures 64, the plurality of third silicon steel sheets 63 are sequentially stacked through the at least two connecting structures 64; the third silicon steel sheet 63 comprises a mounting portion 631, a main body portion 632, and a coupling portion 633, the main body portion 632 is arranged between the mounting portion 631 and the coupling portion 633, the first insulating plate 61 and the second insulating plate 62 are both sleeved on the main body portion 632, the first insulating plate 61 abuts against the bottom of the coupling portion 633, the second insulating plate 62 abuts against the top of the mounting portion 631, the coil 5 is wound between the first insulating plate 61 and the second insulating plate 62, and the second arc surface 60 is arranged on the coupling portion 633; the width of the main body portion 632 is smaller than the width of the coupling portion 633, and the width of the coupling portion 633 is smaller than the width of the mounting portion 631.

[0054] In actual application, the connecting structure 64 is preferably a connecting column (such as in the embodiment) or a riveting point arranged on the third silicon steel sheet 63. When the connecting structure 64 is a riveting point, the riveting point is arranged at one end of the third silicon steel sheet 63, and the other end of the third silicon steel sheet 63 is provided with a riveting concave point, and the adjacent riveting points and riveting concave points are riveted through riveting, which also achieves the effect of positioning and fixing.

[0055] The arrangement of the connecting structure 64 on the third silicon steel sheet 63 has basically the same function as that of the limiting strip on the second silicon steel sheet 34, which will not be described herein. The skeleton structure is formed by the plurality of third silicon steel sheets 63, the coil 5 is separated by the first insulating plate 61 and the second insulating plate 62, the magnetic conducting assembly and the coil 5 form the coil 5 structure commonly used in electromagnets, the magnetic field generated by the coil 5 can be amplified as much as possible through the contact between the third silicon steel sheet 63 and the second silicon steel sheet 34, thereby ensuring the driving force on the rotor 2.

[0056] In the embodiment, limiting portions 634 are arranged on both sides of the coupling portion 633, and the limiting portions 634 are used to abut against the permanent magnet 9 / installing groove 102 to limit the rotation angle of the rotor 2 twice.

[0057] In normal use, the cooperation of the pole shoe 343 and the permanent magnet 9 can achieve the effect of electromagnetic limiting, and in this case, the abutment between the limiting portion 634 and the permanent magnet 9 / installing groove 102 for mechanical limiting basically will not be used. The mechanical limiting mainly serves as secondary limiting, that is, when an unexpected situation occurs and the electromagnetic limiting cannot stop the rotation amplitude of the permanent magnet 9, the mechanical limiting can ensure that the rotation of the permanent magnet 9 will not exceed the safe range. For example, in an electric toothbrush, the mechanical limiting can ensure that the brush head will not swing too much to cause damage to the user.

[0058] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the present application are within the scope of the technical solution of the present application.

Claims

1. A small angle oscillating electromagnetic drive module comprising a stator and a rotor, characterized in that: The rotor comprises a rotating shaft, a magnetic conducting assembly and two permanent magnets, the magnetic conducting assembly is arranged on the rotating shaft, the two permanent magnets are arranged at intervals on the magnetic conducting assembly, and the magnetic conducting assembly is provided with a first arc surface; The stator comprises a shell, a Hall sensor, a coil and a magnetic conducting framework, the magnetic conducting framework and the rotating shaft are arranged in the shell, the magnetic conducting framework is arranged on the shell, the coil is wound on the magnetic conducting framework, the magnetic conducting framework is provided with a second arc surface, and the first arc surface and the second arc surface are arranged with a common center; Two pole shoes are arranged in the shell, the pole shoes have inner arc surfaces, and the central angles corresponding to the inner arc surfaces are not greater than the swing angle of the permanent magnet; The Hall sensor is arranged on the shell and is used for sensing the magnetic field change of the permanent magnet to determine the current posture of the rotating shaft; The shell comprises a first terminal cover, a second terminal cover, a positioning assembly and a plurality of second silicon steel sheets, the plurality of second silicon steel sheets are sequentially stacked through the positioning assembly, the plurality of second silicon steel sheets are arranged between the first terminal cover and the second terminal cover, the second silicon steel sheet has a through hole, the through holes of the plurality of second silicon steel sheets are sequentially communicated to form a containing space, the rotor and the magnetic conducting framework are arranged in the containing space, and the two ends of the rotating shaft are rotatably arranged on the first terminal cover and the second terminal cover respectively; The pole shoe is arranged on the second silicon steel sheet; During work, the coil generates an alternating magnetic field, the permanent magnet moves correspondingly under the alternating magnetic field, and thus the rotating shaft of the rotor is controlled to rotate relative to the stator by a required amplitude, and the swing effect is realized.

2. The small angle oscillating electromagnetic drive module of claim 1, wherein: The magnetic conducting assembly comprises a plurality of first silicon steel sheets, the plurality of first silicon steel sheets are sequentially stacked, the plurality of first silicon steel sheets are each provided with a central hole and two mounting grooves, the rotating shaft is riveted in the central hole of the plurality of first silicon steel sheets, and the two permanent magnets are arranged in one-to-one correspondence with the two mounting grooves.

3. The small angle oscillating electromagnetic drive module of claim 2, wherein: The inner side wall of the central hole is provided with a plurality of riveting protrusions, the two sides of the mounting groove are respectively provided with limiting protrusions, the riveting protrusions are used for enhancing the output torque and impact resistance of the rotating shaft, and the limiting protrusions are used for preventing the permanent magnet from being separated from the mounting groove.

4. The small angle oscillating electromagnetic drive module of claim 1, wherein: The distance between the first arc surface and the second arc surface is not greater than 0.1 mm.

5. The small angle oscillating electromagnetic drive module of claim 1, wherein: The positioning assembly comprises at least two positioning rods, the second silicon steel sheet is provided with positioning holes in the same number as the positioning rods, and the positioning rods and the positioning holes are arranged in one-to-one correspondence.

6. The small angle oscillating electromagnetic drive module of claim 1, wherein: The pole shoe is arranged in the containing space, one end of the pole shoe is connected with the second silicon steel sheet, and the other end of the pole shoe is arranged in suspension; and the top of the containing space is further provided with a bracket for mounting the Hall sensor.

7. The small angle oscillating electromagnetic drive module of claim 6, wherein: The pole shoe comprises a main body, a connecting portion and a micro magnetic path, the connecting portion is arranged at one end of the main body, the connecting portion is connected with the second silicon steel sheet, the micro magnetic path is arranged between the main body and the second silicon steel sheet, and the micro magnetic path is arranged at intervals with the connecting portion.

8. The small angle oscillating electromagnetic drive module of claim 1, wherein: The magnetic conducting assembly comprises a first insulating plate, a second insulating plate, a plurality of third silicon steel sheets and at least two connecting structures, the plurality of third silicon steel sheets are sequentially stacked through the at least two connecting structures; the third silicon steel sheet comprises a mounting portion, a main body portion and a coupling portion, the main body portion is arranged between the mounting portion and the coupling portion, the first insulating plate and the second insulating plate are sleeved on the main body portion, the first insulating plate abuts against the bottom of the coupling portion, the second insulating plate abuts against the top of the mounting portion, the coil is wound between the first insulating plate and the second insulating plate, and the second arc surface is arranged on the coupling portion. The width of the main body part is less than the width of the coupling part, and the width of the coupling part is less than the width of the mounting part.

9. The small angle oscillating electromagnetic drive module of claim 8, wherein: Two sides of the coupling part are respectively provided with limiting parts, and the limiting parts are used for abutting against the permanent magnet to limit the rotation angle of the rotor twice.

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