Sound wave motor

Abstract

The utility model relates to a sound wave motor, comprising a housing extending along a first direction; the output shaft can be rotatably mounted in the shell and extends along a first direction; the rotor assembly comprises a rotor iron core and two magnets, the rotor iron core is installed on the output shaft, the rotor iron core is provided with two opposite installation grooves, and each magnet is installed in the corresponding installation groove; the stator assembly is arranged in the shell and surrounds the rotor assembly in the radial direction of the output shaft; the stator assembly can drive the rotor assembly to move in a reciprocating mode in the circumferential direction of the output shaft, and then the output shaft is driven to move in a reciprocating mode in the circumferential direction of the output shaft. The two sides of the rotor core can be provided with a whole large magnet, so that the area of the magnet is enlarged, the magnetic force is enhanced, and the rotating force of the motor is enhanced.

Description

acoustic motor Technical Field

[0001] This utility model relates to the field of micro motors, and in particular to an acoustic motor. Background Technology

[0002] In the design of micro motors, the rotor assembly plays a crucial role, and its performance directly affects the overall performance of the motor. The rotor assembly typically consists of two parts: a rotor core and magnets. During the design process, multiple magnets are usually arranged and evenly distributed along the circumference of the rotor core to ensure its balance and stability during operation.

[0003] When an electric current passes through the coils in the stator assembly, the coils generate virtual magnetic poles. These virtual magnetic poles interact with the magnets in the mover assembly, generating an electromagnetic force that drives the mover assembly to move or rotate. This generation of electromagnetic force is one of the fundamental principles of how micromotors work.

[0004] However, the large number and small area of ​​the magnets limit the strength of the magnetic force to some extent. A weakening of the magnetic force directly affects the motor's rotational force, thus impacting its overall performance. Therefore, there is room and a need for further design improvements to the existing rotor assembly to enhance the motor's efficiency and output torque.

[0005] The information disclosed in the background section of this utility model is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a sonic motor that can be equipped with large magnets on both sides of the rotor core, thereby increasing the magnet area, enhancing the magnetic force, and thus increasing the rotational force of the motor.

[0007] To address the aforementioned problems, this utility model provides an acoustic motor, comprising: a housing extending along a first direction; an output shaft rotatably mounted within the housing and extending along the first direction; a rotor assembly including a rotor core and two magnets, the rotor core being mounted on the output shaft, the rotor core having two opposing mounting slots, each magnet being mounted in a corresponding mounting slot; and a stator assembly disposed within the housing and radially surrounding the rotor assembly of the output shaft; wherein the stator assembly is capable of driving the rotor assembly to reciprocate along the circumferential direction of the output shaft, thereby driving the output shaft to reciprocate along the circumferential direction of the output shaft.

[0008] Preferably, the rotor core includes: a core body; two fixing parts located at both ends of the core body along a first direction; wherein, in a second direction, the fixing parts are higher than the core body by a predetermined height to form the mounting groove, and the second direction is perpendicular to the first direction.

[0009] Preferably, in the third direction, the fixing part is flush with the iron core body, and the third direction is perpendicular to the second direction and the first direction.

[0010] Preferably, the magnet is mounted between the two fixed parts by an interference fit.

[0011] Preferably, the magnet is bonded to the iron core body.

[0012] Preferably, the magnet is mounted between two fixed parts by an interference fit, and the magnet is bonded to the iron core body.

[0013] Preferably, in the third direction, the magnet is flush with the iron core body, and in the second direction, the magnet is higher than the fixing part by a predetermined height.

[0014] Preferably, the side of the magnet away from the output shaft is provided with an inclined surface to form a trapezoidal structure, thereby avoiding interference with the stator assembly during reciprocating rotation.

[0015] Preferably, the housing includes: a housing body having a mounting plate at its front end, the output shaft being mounted on the mounting plate via a bearing and capable of extending through the mounting plate; a through-type rear cover mounted on the rear end of the housing body and having a receiving cavity; and a spring piece having its front end connected to the rear end of the output shaft and one of the two fixing portions near the through-type rear cover, the spring piece extending into the receiving cavity along a first direction, and the rear end of the spring piece being connected to the rear sidewall of the through-type rear cover to limit the angle of reciprocating rotation of the output shaft in the circumferential direction.

[0016] Preferably, the N pole and S pole of the magnet are distributed along a third direction.

[0017] The acoustic motor of this invention can be equipped with large magnets on both sides of the rotor core, which increases the magnet area and thus enhances the magnetic force, thereby increasing the rotational force of the motor.

[0018] The device of this invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and subsequent embodiments incorporated herein, which together serve to explain the particular principles of this invention. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the structure of the acoustic motor according to the embodiment of this utility model;

[0020] Figure 2 is a schematic diagram of Figure 1 after omitting the shell body;

[0021] Figure 3 is a schematic diagram of Figure 2 after omitting the stator core and insulation frame;

[0022] Figure 4 is a schematic diagram of the fit between the rotor core and the magnet;

[0023] Figure 5 is a schematic diagram of the rotor core structure;

[0024] Figure 6 is a schematic diagram of the shell body;

[0025] Figure 7 is a schematic diagram of the shell body from another perspective;

[0026] Figure 8 is a schematic diagram of the connection of the spring clip;

[0027] Figure 9 is a schematic diagram of the connection of the spring clips;

[0028] Figure 10 is a schematic diagram of the rear end after the output shaft and rotor core are assembled together;

[0029] Figure 11 is a schematic diagram of the rear end of the rotor core;

[0030] Figure 12 is a schematic diagram of the rear end of the output shaft;

[0031] Figure 13 is a cross-sectional view of Figure 1.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Housing; 110. Housing body; 111. Mounting plate; 120. Straight-insertion rear cover; 121. Receiving cavity; 122. Rear side wall; 123. Mounting hole; 130. Spring clip;

[0034] 200, Output shaft; 201, Bearing; 202, Limiting surface; 203, Mounting hole;

[0035] 300. Rotor assembly;

[0036] 310. Rotor core; 311. Mounting slot; 312. Core body; 313. Fixing part; 314. Limiting slot; 315. Mounting hole; 316. Inclined surface;

[0037] 320. Magnet; 321. Inclined plane;

[0038] 400. Stator assembly; 410. Stator core; 420. Coil; 430. Insulation frame.

[0039] It should be understood that the accompanying drawings are not necessarily drawn to scale, but rather present simplified representations of various features to illustrate the basic principles of this invention. The specific design features disclosed in this invention (including, for example, specific dimensions, orientations, positions, and shapes) will be determined in part by the specific application and environment in which they will be used.

[0040] Throughout these figures, the same reference numerals denote the same or equivalent parts of the present invention. Detailed Implementation

[0041] The present invention will now be described in detail with reference to various embodiments, examples of which are presented in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the present invention to these exemplary embodiments. Rather, the present invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments that may be included within the spirit of the present invention and the scope defined by the appended claims.

[0042] When a component is referred to as being "above" or "on top of" another component, the component may be in contact with the other component, or the component may be spaced apart from the other component, or there may be an intermediate component between the component and the other component.

[0043] The acoustic motor of the present invention will be described below with reference to Figures 1 to 13.

[0044] As shown in Figures 1 to 3, the acoustic motor of this utility model includes: a housing 100, an output shaft 200, a rotor assembly 300, and a stator assembly 400.

[0045] The housing 100 extends along a first direction and is used to carry the output shaft 200, the rotor assembly 300, and the stator assembly 400.

[0046] The output shaft 200 is rotatably mounted inside the housing 100 and extends in a first direction.

[0047] As shown in Figures 4 and 5, the rotor assembly 300 includes a rotor core 310 and two magnets 320. The rotor core 310 is mounted on the output shaft 200. The rotor core 310 is provided with two opposing mounting slots 311, and each magnet 320 is mounted in the corresponding mounting slot 311.

[0048] The stator assembly 400 is disposed within the housing 100 and radially surrounds the rotor assembly 300 in the output shaft 200.

[0049] The stator assembly 400 can drive the rotor assembly 300 to reciprocate along the circumferential direction of the output shaft 200, thereby driving the output shaft 200 to reciprocate along the circumferential direction of the output shaft 200.

[0050] In this embodiment of the invention, by arranging large, monolithic magnets on both sides of the rotor core 310, the area of ​​the magnet 320 is significantly increased. This design significantly enhances the strength of the magnetic field, thereby increasing the motor's rotational torque. In this way, the motor can generate greater torque during operation, thus improving its overall performance and efficiency.

[0051] In an exemplary embodiment, as shown in Figures 4 and 5, the rotor core 310 includes a core body 312 and two fixing portions 313.

[0052] The iron core body 312 extends along the first direction.

[0053] The two fixing parts 313 are located at both ends of the iron core body 312 along the first direction.

[0054] In the second direction, the fixing part 313 is higher than the iron core body 312 by a predetermined height to form a mounting groove 311, and the second direction is perpendicular to the first direction.

[0055] The 310 rotor core is constructed by stacking silicon steel sheets one by one. These silicon steel sheets are precisely cut and processed to ensure that each sheet fits perfectly, forming a robust and uniform whole. This stacking method effectively reduces eddy current losses and improves the efficiency and performance of the motor. The entire process requires meticulous craftsmanship and strict quality control to ensure the quality and reliability of the final product.

[0056] Furthermore, the design of the rotor core 310 also takes into account the uniform distribution of the magnetic field. The stacked structure of silicon steel sheets not only enhances the mechanical strength of the core but also promotes the uniform penetration of the magnetic field, allowing each layer of silicon steel sheets to fully utilize the magnetic field energy and further improve the motor's torque. This design enables the acoustic motor to maintain stable output during operation, reducing energy loss caused by uneven magnetic fields. Simultaneously, precise cutting and processing ensures a tight fit between the silicon steel sheets, avoiding vibration and noise caused by gaps, thereby improving the overall performance and reliability of the motor.

[0057] In an exemplary embodiment, the fixing part 313 is integrally formed with the core body 312. In other embodiments, the fixing part 313 and the core body 312 may not be integrally formed. For example, in some embodiments, the fixing part 313 can be fixed to the core body 312 by mechanical connection methods such as welding, riveting, or bolting. Such a design provides greater flexibility, allowing the material, shape, and size of the fixing part 313 to be adjusted according to specific application requirements. At the same time, this non-integrated design also facilitates maintenance and replacement, reducing maintenance costs. However, it should be noted that regardless of whether the fixing part 313 and the core body 312 are integrally formed, it is necessary to ensure that the connection between them is firm and reliable to withstand various forces and vibrations during motor operation.

[0058] In an exemplary embodiment, in the third direction, the fixing part 313 is flush with the iron core body 312 to increase the area of ​​the magnet 320, and the third direction is perpendicular to the second and first directions. This design not only optimizes the layout of the magnet 320 but also improves the overall performance of the acoustic motor. The increased area of ​​the magnet 320 means that a stronger magnetic field can be generated, thereby enhancing the driving force and response speed of the motor. At the same time, the flush design of the fixing part 313 and the iron core body 312 in the third direction also ensures the compactness and stability of the motor structure, reducing unnecessary space occupation and potential vibration problems.

[0059] To ensure the stability and durability of the magnet 320 during motor operation, different implementation schemes employ different mounting methods. In one implementation scheme, the magnet 320 is tightly mounted between two fixing parts 313 via an interference fit. This mounting method utilizes the dimensional difference between the magnet 320 and the fixing parts 313, making the magnet 320 less prone to detachment under external forces, thus ensuring the reliability of motor operation.

[0060] In another embodiment, the magnet 320 is fixed to the iron core body 312 by adhesive bonding. This installation method utilizes the adhesive force of the adhesive to firmly attach the magnet 320 to the iron core body 312, which can also ensure the stability of the magnet 320 during motor operation.

[0061] In addition, there is a more comprehensive implementation scheme in which the magnet 320 is both installed between the two fixing parts 313 by interference fit and fixed to the iron core body 312 by adhesive bonding. This installation method combines the advantages of the first two methods, further improving the stability and durability of the magnet 320 in the motor. Of course, this does not mean that the installation method of the magnet 320 is limited to these few forms. In fact, as long as the above functions can be achieved, any installation method in the prior art can be adopted.

[0062] In one embodiment, in a third direction, the magnet 320 is flush with the iron core body 312, and in a second direction, the magnet 320 is flush with the fixing part 313.

[0063] In another embodiment, as shown in FIG4, in the third direction, the magnet 320 is flush with the iron core body 312, and in the second direction, the magnet 320 is higher than the fixing part 313 by a predetermined height. This design increases the area of ​​the magnet 320, thereby improving the strength and range of its magnetic force.

[0064] In another implementation, in the third direction, the magnet 320 is higher than the iron core body 312 by a predetermined height, and in the second direction, the magnet 320 is flush with the fixing part 313. This design can also increase the area of ​​the magnet 320, thereby improving the strength and range of its magnetic force.

[0065] In another implementation, in the third direction, the magnet 320 is higher than the iron core body 312 by a predetermined height, and in the second direction, the magnet 320 is higher than the iron core body 312 by a predetermined height. This design can also increase the area of ​​the magnet 320, thereby improving the strength and range of its magnetic force.

[0066] In an exemplary embodiment, as shown in FIG4, the side of the magnet 320 away from the output shaft 200 is provided with a slope 321 to form a trapezoidal structure, which can effectively avoid interference with the stator assembly 400 during reciprocating rotation, thereby enabling the magnet 320 to maintain smooth movement and ensuring the stable operation of the entire system.

[0067] Compared to traditional rectangular magnets, this trapezoidal structure allows the stator and rotor assemblies to be closer together, thus slightly reducing the overall size of the device.

[0068] Furthermore, the design of the inclined surface 321 offers another advantage: optimized magnetic force distribution between the magnet 320 and the stator assembly 400. In traditional rectangular magnet configurations, magnetic field lines tend to be concentrated, potentially leading to excessively strong magnetic forces in some areas and relatively weaker forces in others. The trapezoidal magnet 320, with its inclined surface 321, can more evenly distribute the magnetic field lines, resulting in a more balanced magnetic force on the stator assembly 400. This helps reduce vibration and noise during operation, further improving the performance and reliability of the acoustic motor.

[0069] In other embodiments, the inclined surface 321 can also be replaced with an arc surface, which can also avoid interference with the stator assembly 400 during reciprocating rotation.

[0070] In an exemplary embodiment, as shown in Figures 4 and 5, the side of the fixing part 313 away from the output shaft 200 is provided with an inclined surface 316 to form a trapezoidal structure, which can effectively avoid interference with the stator assembly 400 during reciprocating rotation, thereby enabling the magnet 320 to maintain smooth movement and ensuring the stable operation of the entire system.

[0071] In other embodiments, the inclined surface 316 can also be replaced with an arc surface, which can also avoid interference with the stator assembly 400 during reciprocating rotation.

[0072] In an exemplary embodiment, as shown in Figures 1, 2, 6 to 9, the housing 100 includes: a housing body 110, a straight-insertion back cover 120, and a spring clip 130.

[0073] As shown in Figures 1 and 6, the housing body 110 has a mounting plate 111 at the front end, and the output shaft 200 is mounted on the mounting plate 111 through the bearing 201 and can pass through the mounting plate 111.

[0074] As shown in Figures 8 and 9, the insert-type back cover 120 is installed at the rear end of the housing body 110 and has a receiving cavity 121.

[0075] The front end of the spring 130 is connected to the rear end of the output shaft 200 and one of the two fixing parts 313 near the through-type rear cover 120 (i.e., the rearmost fixing part 313). The spring 130 extends into the receiving cavity 121 along a first direction, and the rear end of the spring 130 is connected to the rear sidewall 122 of the through-type rear cover 120 to limit the angle of reciprocating rotation of the output shaft 200 in the circumferential direction. The spring 130 is capable of torsional elastic deformation when the output shaft 200 and the rotor assembly 300 rotate, so as not to interfere with the rotation of the output shaft 200 and the rotor assembly 300, and to assist the rotation of the output shaft 200 and the rotor assembly 300. For example, when the spring 130 is not torsioned, it is in its natural state. Relative to its natural state, during the rotation of the output shaft 200 along the A direction by a predetermined angle α, the spring 130 generates a torsional restoring force along the B direction. During the process of rotating back to the natural state in the opposite direction (direction B), the torsional restoring force helps the output shaft 200 and rotor assembly 300 rotate back to the natural state.

[0076] The spring 130 can be made of metal. Metal not only possesses good elasticity and torsional restoring ability, but also high strength and corrosion resistance, maintaining stable performance during long-term use. Furthermore, metal spring 130s are easy to process and manufacture, meeting diverse design and performance requirements. Therefore, selecting metal as the primary material for spring 130 ensures the reliability and durability of the acoustic motor.

[0077] Specifically, the output shaft 200 has a mounting hole 203 at its rear end (see Figures 10 and 12 for reference), and the fixing part 313 has a mounting hole 315 (see Figures 10 and 11 for reference) for mounting the front end of the spring 130. The rear sidewall 122 of the through-type rear cover 120 has a mounting hole 123 for mounting the rear end of the spring 130.

[0078] In Figures 8 and 9, although the front end of the spring 130 is connected to the rear end of the output shaft 200 and the fixing part 313, it should be understood that in other embodiments, the front end of the spring 130 may only be connected to the rear end of the output shaft 200 or only to the fixing part 313, which can achieve the same effect.

[0079] Furthermore, the spring 130 can be replaced with a spring element with a similar torsional reset function, such as a torsion spring. These spring elements can also provide the required torsional reset force to ensure stable operation of the acoustic motor. When replacing with a spring element, the spring's stiffness, length, and other parameters can be adjusted to meet the specific design requirements of the acoustic motor. Moreover, the spring element is installed in a similar manner to the spring 130; it can be fixed through mounting holes to ensure a stable connection to the rear end of the output shaft 200 and the fixing part 313, or, depending on actual needs, it can be connected to only one of them. This design flexibility allows the acoustic motor to adapt to different application scenarios and requirements.

[0080] In Figures 8 and 9, the spring 130 is plate-shaped. The shape of the spring 130 is not fixed and can be any design that can generate the required torsional restoring force, such as a straight type or a wave type. Similarly, the number of springs 130 can be increased or decreased according to the actual situation, using one, two or more to ensure the best torsional restoring effect.

[0081] In the above implementation scheme, the spring piece 130 is connected to the output shaft 200, the fixing part 313, and the direct-insertion rear cover 120 by plugging in. Besides plugging, it can also be connected to the output shaft 200, fixing part 313, and direct-insertion rear cover 120 by welding, riveting, or other methods. This diverse connection design aims to improve the assembly efficiency and structural stability of the acoustic motor. For example, when using welding, high temperatures can be used to form a strong metal connection between the spring piece 130 and the output shaft 200, fixing part 313, and direct-insertion rear cover 120, enhancing the overall mechanical strength. Riveting, on the other hand, uses rivets or other fasteners to fix the spring piece 130 to the corresponding components, similarly ensuring the stability of the connection. The choice of connection method mainly depends on the specific design requirements of the acoustic motor, the working environment, and manufacturing costs. Designers can flexibly choose the most suitable connection method according to actual needs to achieve the best performance and stability of the acoustic motor.

[0082] In an exemplary embodiment, as shown in FIG13, the N pole and S pole of the magnet 320 are distributed along a third direction. In the embodiment of FIG13, the N poles of the two magnets 320 are located on the same side, and the S poles of the two magnets 320 are located on the same side. In other embodiments, the N poles of the two magnets 320 may not be located on the same side, and correspondingly, the S poles of the two magnets 320 may not be located on the same side, that is, the S pole of one magnet 320 and the N pole of the other magnet 320 are located on the same side.

[0083] In an exemplary embodiment, as shown in FIG10, the rotor core 310 is provided with a limiting groove 314, and the output shaft 200 is provided with a limiting surface 202 corresponding to the limiting groove 314, so that the output shaft 200 can rotate with the rotor core 310.

[0084] In an exemplary embodiment, as shown in Figures 10 and 13, the stator assembly 400 includes a stator core 410 and a coil 420.

[0085] The stator core 410 is fixed to the inside of the housing 100. The stator core 410 can be formed by stacking silicon steel sheets one by one, thereby improving the magnetic performance.

[0086] The coil 420 is installed on the stator core 410 and generates a magnetic field when energized, which interacts with the magnet 320: like poles repel and unlike poles attract, thereby driving the rotor assembly 300 to rotate around the central axis of the output shaft 200 in the circumferential direction of the output shaft 200, so as to drive the output shaft 200 to rotate around the central axis of the output shaft 200 in the circumferential direction of the output shaft 200.

[0087] When the current in coil 420 changes alternately, the polarity of the magnetic field generated changes alternately, thereby driving rotor assembly 300 and output shaft 200 to reciprocate around the central axis of output shaft 200 along the circumferential direction of output shaft 200.

[0088] In an exemplary embodiment, as shown in FIG13, the stator assembly 400 further includes an insulating frame 430 disposed between the coil 420 and the stator core 410. The insulating frame 430 prevents leakage current and coil wear, thereby ensuring the normal operation of the motor.

[0089] The insulating frame 430 can be made of insulating materials such as plastic, rubber, or ceramics. These materials have good insulation and wear resistance, effectively preventing current leakage and coil wear. By placing the insulating frame 430 between the coil 420 and the stator core 410, the safety and reliability of the motor can be improved, and its service life extended. Furthermore, the insulating frame 430 also serves to fix the coil 420, making the coil 420 more stably mounted on the stator core 410, thereby improving the motor's operational stability.

[0090] In an exemplary embodiment, the housing 100 is provided with a heat dissipation structure, such as heat dissipation holes or heat dissipation vents, which can effectively dissipate the heat generated by the coil 420 during operation, prevent the coil 420 from overheating, ensure the normal operation of the motor, and extend the service life of the motor.

[0091] For ease of interpretation and precise definition of the appended claims, the terms “upper,” “lower,” “inner,” “outer,” “above,” “below,” “above,” “below,” “upward,” “downward,” “front,” “back,” “behind,” “inner side,” “outer side,” “inward,” “outer,” “internal,” “external,” “inner,” “external,” “forward,” and “backward” are used to describe the features of the exemplary embodiments with reference to the positions of these features shown in the accompanying drawings.

[0092] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and descriptive purposes. It is not intended to be exhaustive, nor to limit the invention to the precise forms disclosed; obviously, many changes and variations are possible in accordance with the foregoing teachings. The exemplary embodiments were chosen and described to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to implement and utilize various exemplary embodiments of the invention, as well as their different alternatives and modifications. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sound wave motor, characterized in that, include: A housing extending in a first direction; an output shaft rotatably mounted into the housing and extending in the first direction; A rotor assembly includes a rotor core and two magnets, the rotor core being mounted on the output shaft and having two opposing mounting slots, each magnet being mounted in a corresponding mounting slot; and a stator assembly disposed within the housing and radially surrounding the rotor assembly of the output shaft; wherein the stator assembly is capable of driving the rotor assembly to reciprocate along the circumferential direction of the output shaft, thereby driving the output shaft to reciprocate along the circumferential direction of the output shaft.

2. The acoustic motor according to claim 1, characterized in that, The rotor core includes: a core body; two fixing parts located at both ends of the core body along a first direction; wherein, in a second direction, the fixing parts are higher than the core body by a predetermined height to form the mounting groove, and the second direction is perpendicular to the first direction.

3. The acoustic motor according to claim 2, characterized in that, In the third direction, the fixing part is flush with the iron core body, and the third direction is perpendicular to the second direction and the first direction.

4. The acoustic motor according to claim 2, characterized in that, The magnet is installed between the two fixed parts by an interference fit.

5. The acoustic motor according to claim 2, characterized in that, The magnet is bonded to the iron core body.

6. The acoustic motor according to claim 2, characterized in that, The magnet is installed between two fixed parts by an interference fit, and the magnet is bonded to the iron core body.

7. The acoustic motor according to claim 2, characterized in that, In the third direction, the magnet is flush with the iron core body; in the second direction, the magnet is higher than the fixing part by a predetermined height.

8. The acoustic motor according to claim 2, characterized in that, The magnet has an inclined surface on the side away from the output shaft to form a trapezoidal structure, thereby avoiding interference with the stator assembly during reciprocating rotation.

9. The acoustic motor according to claim 2, characterized in that, The housing includes: a housing body having a mounting plate at its front end, the output shaft being mounted on the mounting plate via a bearing and capable of extending through the mounting plate; a through-type rear cover mounted at the rear end of the housing body and having a receiving cavity; and a spring piece having its front end connected to the rear end of the output shaft and one of two fixing portions near the through-type rear cover, the spring piece extending into the receiving cavity along a first direction, and the rear end of the spring piece connected to the rear sidewall of the through-type rear cover to limit the angle of reciprocating rotation of the output shaft in the circumferential direction.

10. The acoustic motor according to claim 1, characterized in that, The N pole and S pole of the magnet are distributed along the third direction.

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