An amplitude-adjustable magnetic drive motor

Abstract

The application discloses a magnetic drive motor with adjustable amplitude and belongs to the technical field of biological shaking table driving. The motor comprises a rocking shaft upper plate, a rocking shaft lower plate, an elastic support device between the rocking shaft upper plate and the rocking shaft lower plate and a magnetic drive motor main body. A plurality of installation holes are arranged eccentrically on the upper surface of the upper cover, mechanical step adjustment of the eccentricity is realized by selecting and inserting the fixed convex shaft of the installation adjusting disc, a fan-shaped counterweight block is slidably installed on the annular slide rail of the outer edge of the upper cover, the position of the fan-shaped counterweight block is adjustable and can be locked, so that the fan-shaped counterweight block can be rebalanced after amplitude adjustment, centrifugal force generated by the magnetic drive motor main body is transmitted through the adjusting assembly and is converted into reciprocating vibration by the elastic support system. The application realizes quick, accurate and step adjustment of the amplitude, has the advantages of compact structure, stable operation, ultra-low heat interference and simple maintenance, and significantly improves the adaptability and reliability of biological processes.

Description

Technical Field

[0001] This invention relates to the field of biological shaker drive technology, specifically to a magnetic drive motor with adjustable amplitude. Background Technology

[0002] As the core drive unit of equipment such as biological shakers, oscillators, and mixers, the performance of magnetically driven vibration motors directly determines the mixing efficiency, temperature control accuracy, and adaptability to biological samples. An ideal drive motor should have features such as flexible amplitude adjustment, compact structure, stable operation, low thermal interference, and easy maintenance.

[0003] Currently, there are two main types of typical driving solutions in the technology field:

[0004] One type is the traditional mechanical fixed-eccentricity vibration motor, which drives a rotor (such as an eccentric block or eccentric shaft) with a fixed eccentric mass to rotate, using the generated centrifugal force to drive the load platform in periodic reciprocating motion. However, since the eccentricity is mechanically fixed, once the motor model is selected, its maximum output amplitude is determined. Users cannot flexibly adjust the amplitude on the same device according to different experimental needs (e.g., gently mixing cells versus vigorously mixing reagents), greatly limiting the application range and experimental efficiency of the equipment. To change the amplitude, the entire motor or eccentric component must be replaced, which is cumbersome and costly. Furthermore, with a fixed eccentricity, the amplitude is proportional to the square of the rotational speed. This means that to obtain a large amplitude, the motor speed must be significantly increased. However, for applications such as shear-sensitive cell culture, the high shear force brought by high speed can easily lead to cell damage or lysis. This strong coupling relationship makes it impossible for users to obtain large amplitude under low-speed conditions or achieve micro-amplitude oscillation under high-speed conditions, failing to meet the contradictory requirements of "low-frequency large amplitude" and "high-frequency micro-amplitude".

[0005] Another type is the adjustable amplitude motor driven by electromagnetic induction, which directly drives the platform to perform linear motion using linear electromagnets. Its technical principle is to directly generate the required excitation force by controlling the magnitude and direction of the current input to the electromagnetic coil. However, to generate sufficient electromagnetic force to drive a fully loaded platform (especially for large amplitude applications), the system needs to continuously supply a large current. This causes the electromagnetic coil to generate a large amount of Joule heat, with measured coil temperature rises exceeding 15°C. This significant heat directly interferes with the precise and stable temperature environment inside the incubator (typically requiring ±0.5°C or even higher), adversely affecting temperature-sensitive cell culture or biochemical reaction processes. Furthermore, this system relies entirely on a sophisticated electronic control system to maintain stable operation. When sudden load changes occur (e.g., accidental spillage of culture medium causing a sudden load change), the control system needs to respond instantaneously, making it highly susceptible to damage to expensive power devices (such as IGBTs and MOSFETs) due to current overshoot. The system's shock resistance and reliability are inferior to mechanical structures. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an amplitude-adjustable magnetic drive motor that overcomes the deficiencies of existing technologies. It is rationally designed and achieves rapid, precise, and graded amplitude adjustment, while also possessing the advantages of compact structure, stable operation, ultra-low thermal interference, and easy maintenance.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An amplitude-adjustable magnetic drive motor includes an upper rocker shaft plate and a lower rocker shaft plate arranged in parallel. An elastic support device is fixedly connected between the upper and lower rocker shaft plates, and the magnetic drive motor body is disposed between the lower rocker shaft plates.

[0009] The magnetic drive motor body includes a lower base, an upper cover, a rotating shaft, a rotor assembly, and a stator assembly. The lower base and the upper cover together form the motor housing. The lower base is fixedly mounted on the upper surface of the lower plate of the rotating shaft. The rotating shaft is rotatably supported inside the motor housing by at least one pair of bearings. The rotor assembly is fixedly sleeved on the rotating shaft. The stator assembly is fixedly mounted inside the motor housing and is electromagnetically coupled to the rotor assembly. The upper cover is coaxially fixedly connected to the rotor assembly and rotates synchronously with the rotor assembly.

[0010] The upper surface of the cover has multiple mounting holes radially arranged at an eccentric position. An adjustment assembly is provided above the upper cover. The adjustment assembly includes an adjustment seat, an adjustment bearing, and a bearing mounting plate. A fixed convex shaft is provided at the center of the lower surface of the adjustment seat. The adjustment seat is positioned by engaging with the mounting holes on the upper surface of the cover through the fixed convex shaft. The inner ring of the adjustment bearing is interference-fitted and installed on the outside of the adjustment seat. The outer ring of the adjustment bearing is interference-fitted and connected to the bearing mounting plate. The bearing mounting plate is fixedly connected to the lower surface of the upper plate of the rocker shaft. A counterweight is installed on the circumference of the side of the upper cover.

[0011] Preferably, the number of mounting holes is four, and the distances from the four mounting holes to the central axis of the upper cover are 3mm, 12.5mm, 26mm, and 50mm, respectively.

[0012] Preferably, the elastic support device includes a lower fixed steel plate and an upper spring steel plate. The lower fixed steel plate is fixedly installed on the upper surface of the lower plate of the rocker shaft. The lower fixed steel plate is fixedly connected to one end of the two sides of the magnetic drive middle plate. The other end of the magnetic drive middle plate is fixedly connected to one end of each of the two upper spring steel plates. The other ends of the two upper spring steel plates are fixedly connected to the lower surface of the upper plate of the rocker shaft. The main body of the magnetic drive motor is located in the middle cavity of the magnetic drive middle plate.

[0013] Preferably, an annular slide rail is provided on the outer edge of the upper surface of the cover, and multiple counterweights are slidably mounted on the annular slide rail. The position of the counterweights along the annular slide rail is adjustable and can be locked.

[0014] Preferably, multiple threaded holes are evenly provided at the edge of the upper surface of the cover, and the counterweight is connected and fixed by screws that engage with the threaded holes at different positions.

[0015] Preferably, the stator assembly includes a magnet mounting sleeve and a permanent magnet fixed to the inner wall of the magnet mounting sleeve. The magnet mounting sleeve is coaxially and fixedly connected to the upper cover. The magnetic field generated by the permanent magnet interacts with the stator coil of the motor, driving the rotor assembly to reciprocate.

[0016] The counterweight has a fan-shaped structure, and the arc surface of the counterweight fits against the outer surface of the magnet mounting sleeve.

[0017] Preferably, the upper surface of the cover is provided with a positioning hole, and the inner side of the counterweight is provided with a positioning groove. The positioning groove and the positioning hole are engaged by a positioning pin to achieve circumferential positioning.

[0018] This invention provides an amplitude-adjustable magnetic drive motor with the following advantages: Through a mechanism based on the cooperation between multiple radial mounting holes pre-set on the top cover and the mounting adjustment seat, the operator can select mounting holes of different radii for fixing according to actual eccentricity requirements, thereby adjusting the eccentricity of the mounting adjustment seat. Furthermore, the entire amplitude adjustment process is entirely mechanical, requiring no replacement of the entire motor or complex components. Moreover, by setting multiple counterweights on the edge of the top cover, and adjusting the position of the counterweights in the relative direction of the eccentric mass, the rotational imbalance torque caused by changes in eccentricity is effectively compensated. This allows the motor to maintain excellent dynamic balance at all amplitude levels, significantly reducing vibration and noise. Compared to pure electromagnetic direct drive systems, the mechanical structure of this invention has a natural buffering and bearing capacity for instantaneous load changes such as liquid splashing, and will not be damaged by current overshoot, resulting in stronger system robustness and a longer service life. Furthermore, since amplitude adjustment is achieved mechanically rather than by increasing the current, the load on the electromagnetic coil is stable, and the generated heat is extremely low. This, in turn, ensures the uniformity and stability of the temperature inside the incubator. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the accompanying drawings used in the description of this invention or the prior art will be briefly introduced below.

[0020] Figure 1 A schematic diagram of the structure of this invention;

[0021] Figure 2 A schematic diagram of the structure of the lower plate of the rocker shaft in this invention;

[0022] Figure 3 A schematic diagram showing the unfolded structure of the magnetic drive motor body and adjustment components in this invention;

[0023] Figure 4 A schematic diagram of the cross-sectional structure of the magnetic drive motor body and the adjustment assembly in this invention;

[0024] Figure 5 A schematic diagram of the installation structure of the magnetic drive motor body and the adjustment assembly in this invention;

[0025] Explanation of the labels in the diagram:

[0026] 1. Upper plate of rocker shaft; 2. Lower plate of rocker shaft; 3. Elastic support device; 5. Lower base; 6. Upper cover; 7. Bearing; 8. Mounting hole; 9. Mounting adjustment seat; 10. Adjusting bearing; 11. Bearing mounting plate; 12. Fixed cam shaft; 13. Counterweight block; 14. Magnetic drive middle plate; 15. Circular slide rail; 16. Magnet mounting sleeve; 31. Lower fixed steel plate; 32. Upper spring steel plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0028] Example 1, as Figure 1-5 As shown, an amplitude-adjustable magnetic drive motor includes an upper rocker shaft plate 1 and a lower rocker shaft plate 2 arranged in parallel. An elastic support device 3 is fixedly connected between the upper rocker shaft plate 1 and the lower rocker shaft plate 2. The magnetic drive motor body is disposed between the lower rocker shaft plate 2 and the lower rocker shaft plate 2.

[0029] The main body of the magnetic drive motor includes a lower base 5, an upper cover 6, a rotating shaft, a rotor assembly, and a stator assembly. The lower base 5 and the upper cover 6 together form the motor housing. The lower base 5 is fixedly installed on the upper surface of the lower plate 2 of the rocker shaft. The rotating shaft is rotatably supported in the motor housing by at least one pair of bearings 7. The rotor assembly is fixedly sleeved on the rotating shaft. The stator assembly is fixedly installed in the motor housing and is electromagnetically coupled to the rotor assembly. The upper cover 6 is coaxially fixedly connected to the rotor assembly and rotates synchronously with the rotor assembly.

[0030] Multiple mounting holes 8 are radially arranged at an eccentric position on the upper surface of the top cover 6. An adjustment assembly is provided above the top cover 6. The adjustment assembly includes an adjustment mounting seat 9, an adjustment bearing 10, and a bearing mounting plate 11. A fixing convex shaft 12 is provided at the center of the lower surface of the adjustment mounting seat 9. The adjustment mounting seat 9 is positioned by engaging with the mounting holes 8 on the upper surface of the top cover 6 through the fixing convex shaft 12. A cylindrical block is provided on the upper surface of the adjustment mounting seat 9. The cylindrical block is interference-fitted with the inner ring of the adjustment bearing 10. The outer ring of the adjustment bearing 10 is interference-fitted with the bearing mounting plate 11. The bearing mounting plate 11 is fixedly connected to the lower surface of the rocker shaft upper plate 1. A counterweight block 13 is installed on the circumference of the side of the top cover 6.

[0031] Working principle:

[0032] When in use, first select the mounting hole 8 corresponding to the required eccentricity according to the target amplitude. For example, when a large amplitude is required, select the mounting hole farthest from the rotation center; when a small amplitude vibration is required, select the mounting hole closest to the target amplitude. Then, insert the fixed cam 12 on the lower surface of the mounting adjustment seat 9 into the selected mounting hole 8 for positioning. At this time, the geometric center of the mounting adjustment seat 9 (i.e., the axis of the fixed cam 12) relative to the rotation center of the upper cover 6 generates a fixed, preset eccentricity.

[0033] Due to the change in eccentricity, the center of gravity of the entire rotating system (upper cover 6, adjusting components, and upper rocker plate 1, etc.) shifts. To counteract this imbalance and prevent abnormal vibration of the equipment, the position of the counterweight 13 on the annular slide rail 15 needs to be adjusted synchronously. The basic principle is: when the eccentricity increases, the counterweight 13 is slid to the symmetrical sides to increase the angle between the counterweights 13, thereby increasing the overall centrifugal force balance range and ensuring stability during rotation; when the eccentricity decreases, the counterweight is retracted to the central symmetrical position to reduce the angle distribution and maintain dynamic balance. By adjusting the selection of the mounting holes and the coordinated displacement of the counterweights, the rotating system can regain or approach dynamic balance under new operating conditions, ensuring the smooth operation of the motor.

[0034] After the mechanical preset is completed, the motor is started, and the system enters a dynamic working state. At this time, the coils in the stator assembly are energized, generating a rotating magnetic field, which interacts with the magnetic field of the permanent magnet in the rotor assembly to generate electromagnetic torque, driving the shaft and the upper cover 6 and the magnet mounting sleeve 16 fixed thereto to rotate together. During the rotation, since the mounting adjustment seat 9 is eccentrically fixed to the upper cover 6 through the fixed convex shaft 12, its center of mass is deviated from the rotation axis of the entire system. When it rotates at high speed with the upper cover 6, it generates a centrifugal force with a periodically changing direction and a constant magnitude. This centrifugal force is transmitted through two paths: one path is through the mounting adjustment plate 9 to act the centrifugal force on the inner ring of the bearing 10 with which it is interference-fitted. Since the outer ring of the bearing 10 is interference-fitted with the bearing mounting plate 11, and the bearing mounting plate 11 is fixed on the stationary rocker shaft upper plate 1, the centrifugal force is effectively transmitted to the rocker shaft upper plate 1. The other path involves the rotation of the upper cover 6 driving the connected counterweight 13 to rotate synchronously. The counterweight 13 generates a counterbalancing force under centrifugal force, which is transmitted through the magnetic drive plate 14 and the elastic support device 3. The centrifugal force acting on the upper rocker plate 1 is a constantly changing excitation force. This force attempts to pull the upper rocker plate 1, but the upper rocker plate 1 and the lower rocker plate 2 are connected by the elastic support device 3, which has elastic restoring force. Under the continuous action of the excitation force, the entire upper rocker plate 1 is forced to reciprocate in an approximately linear manner, perpendicular to the direction of rotation, within the deformation range of the elastic support device. In this process, the elastic support device 3 not only provides support and guidance, but more importantly, its elastic deformation and recovery are crucial for generating and maintaining stable vibration.

[0035] This invention utilizes a mechanism based on the engagement of multiple radial mounting holes 8 pre-set on the upper cover 6 with the mounting adjustment seat 9. The operator can select mounting holes 8 of different radii for fixing according to actual eccentricity requirements, thereby adjusting the eccentricity of the mounting adjustment seat 9. Furthermore, the entire amplitude adjustment process is entirely mechanical, requiring no replacement of the entire motor or complex components. By setting multiple counterweights 13 along the edge of the upper cover 6, and adjusting the position of the counterweights in the relative directions of the eccentric mass, the rotational imbalance torque caused by changes in eccentricity is effectively compensated. This allows the motor to maintain excellent dynamic balance at all amplitude levels, significantly reducing vibration and noise. Compared to pure electromagnetic direct drive systems, the mechanical structure of this invention has a natural buffering and bearing capacity against instantaneous load changes such as liquid splashing, preventing damage from current overshoot, resulting in stronger system robustness and a longer service life. Moreover, since amplitude adjustment is achieved mechanically rather than by increasing the current, the load on the electromagnetic coil is stable, generating extremely low heat. This ensures the uniformity and stability of the temperature inside the incubator, and can control the ambient temperature fluctuation within a precise range of ±0.3℃, providing crucial environmental protection for temperature-sensitive bioprocesses such as cell culture and protein crystallization.

[0036] In Example 2, as a further preferred embodiment of Example 1, four mounting holes 8 are used. The distances from the four mounting holes 8 to the central axis of the upper cover 6 are 3mm, 12.5mm, 26mm, and 50mm, respectively. In this embodiment, the four specific eccentricity values ​​(3, 12.5, 26, 50mm) are not arbitrarily chosen, but rather carefully calculated and experimentally verified to cover the most commonly used and critical amplitude ranges from basic research to large-scale production. The 3mm setting (micro-amplitude oscillation) is suitable for cell types that are extremely sensitive to shear forces, such as mammalian suspension cells, stem cells, or certain fragile insect cells. This setting provides extremely gentle mixing, ensuring uniform distribution of nutrients and gases while minimizing fluid shear forces, effectively preventing cell damage and apoptosis. The 12.5mm and 26mm settings (normal and medium-amplitude oscillation) are suitable for most standard cell lines, bacterial cultures, and yeast fermentations, and other routine biological experiments, achieving good mixing efficiency and oxygen mass transfer rates, ensuring high activity and stability of the culture system. The 50mm setting (large oscillation) is designed for high-density culture, viscous liquid mixing, or special processes requiring extremely high mass transfer efficiency. For example, in filamentous fungal fermentation or certain high-density bacterial cultures, this setting can effectively break down the fluidity barrier of the culture medium, prevent precipitation, and ensure uniform distribution of metabolites.

[0037] In Example 3, as a further preferred embodiment of Example 1, the elastic support device 3 includes a lower fixed steel plate 31 and an upper spring steel plate 32. The lower fixed steel plate 31 is fixedly installed on the upper surface of the lower plate 2 of the rocker shaft. The lower fixed steel plate 31 is fixedly connected to one end of the magnetic drive middle plate 14 on both sides. The other end of the magnetic drive middle plate 14 is fixedly connected to one end of each of the two upper spring steel plates 32. The other ends of the two upper spring steel plates 32 are fixedly connected to the lower surface of the upper plate 1 of the rocker shaft. The main body of the magnetic drive motor is located in the middle cavity of the magnetic drive middle plate 14. The lower fixed steel plate 31 provides the main load-bearing capacity and basic rigidity, while the upper spring steel plates 32 provide the main elastic deformation and restoring force in the direction perpendicular to the shaft (i.e., the vibration direction). The magnetic drive middle plate 14, together with the lower fixed steel plates 31 and the upper spring steel plates 32 on both sides, constitute an approximately "door"-shaped rigid frame. This frame "embraces" the motor body in the middle, greatly enhancing the system's torsional and bending stiffness in the horizontal plane. Two upper spring steel plates 32 are symmetrically arranged on both sides of the magnetic drive middle plate 14, so that the excitation force is symmetrically transmitted and balanced. This symmetry ensures that almost all vibration energy is converted into unidirectional linear motion.

[0038] In Example 4, as a further preferred embodiment of Example 1, an annular slide rail 15 is provided on the outer edge of the upper surface of the cover 6. Multiple counterweights 13 are slidably mounted on the annular slide rail 15. The position of the counterweights 13 along the annular slide rail 15 is adjustable and lockable. The annular slide rail 15 provides a precise circular path, allowing continuous and linear positional fine-tuning of the counterweights 13 within a 360° range. This enables the precise generation of a compensating centrifugal force equal in magnitude and opposite in direction to the eccentric centrifugal force. This precise compensation effectively counteracts the unbalanced torque introduced by the amplitude adjustment operation. This ensures that the motor maintains excellent dynamic balance during startup and operation at any amplitude setting, eliminating abnormal vibrations and noise caused by imbalance at its source, and guaranteeing the smoothness and quietness of equipment operation. Furthermore, users can not only adjust the position of individual counterweights but also change the total compensation mass by increasing or decreasing the number of counterweights. This provides two dimensions of adjustment freedom, enabling the system to adapt to a wider range of load variations and more extreme eccentricity settings, achieving unprecedented adjustment flexibility.

[0039] In Example 5, as a further preferred embodiment of Example 4, multiple threaded holes are evenly distributed along the edge of the upper surface of the cover 6. The counterweight 13 is connected and fixed by screws that engage with the threaded holes at different positions. The counterweight 13 can slide continuously and steplessly on the annular slide rail 15 to find the optimal balance point (flexibility). Once found, it is locked in a stepped and secure manner by engaging the screws with the nearest threaded hole. In this embodiment, because the motor is rotating at high speed, the counterweight 13 is subjected to a huge centrifugal force, which tends to fly out along the tangent of the slide rail. At the same time, the entire system is in a high-frequency micro-amplitude vibration. Ordinary friction locking, snap-fit, or magnetic attraction structures are prone to loosening and failure under this environment. The screws, through mechanical thread engagement with the threaded holes, provide a strong axial locking force, pressing the counterweight tightly against the slide rail surface. The static friction torque generated is much greater than the loosening torque generated by the rotational centrifugal force, ensuring that the counterweight does not shift or loosen under high-speed rotation.

[0040] In Example 6, as a further preferred embodiment of Example 4, the stator assembly includes a magnet mounting sleeve 16 and a permanent magnet fixed to the inner wall of the magnet mounting sleeve 16. The magnet mounting sleeve 16 is coaxially and fixedly connected to the upper cover 6. The magnetic field generated by the permanent magnet interacts with the stator coil of the motor, driving the rotor assembly to reciprocate. The counterweight 13 has a fan-shaped structure, and the arc surface of the counterweight 13 is in contact with the outer surface of the magnet mounting sleeve 16. By designing the counterweight 13 as a fan-shaped structure and having its arc surface in contact with the outer surface of the magnet mounting sleeve 16, a surface contact fit between the counterweight and the magnet mounting sleeve is achieved, significantly increasing the contact area and improving the stability and vibration resistance of the structure. It also maximizes the use of the unused space around the magnet mounting sleeve 16 to arrange the counterweight, enabling the entire machine to achieve an ultra-thin and compact design. Furthermore, since the magnet mounting sleeve 16 generates heat due to the eddy current effect during operation, multiple metal counterweights 13 are tightly attached to the outer surface of the magnet mounting sleeve 16 to form a highly efficient passive heat dissipation system. This allows heat to be conducted away from the magnet mounting sleeve through good contact, and the airflow during rotation accelerates heat dissipation.

[0041] Example 7, a further preferred embodiment of Example 1, features a positioning hole on the upper surface of the top cover 6 and a positioning groove on the inner side of the counterweight 13. The positioning groove and the positioning hole are engaged by a positioning pin to achieve circumferential positioning. The positioning hole and the top cover 6 enable rapid positioning. The positioning hole engages with the positioning groove on the inner side of the counterweight, allowing the operator to insert the positioning pin during installation without fine angle adjustments. Simply align the positioning groove of the counterweight 13 with the positioning pin for automatic and precise positioning. This design significantly improves assembly efficiency and consistency, making it particularly suitable for mass production. The engagement of the positioning pin and the positioning hole ensures the repeatability of the installation angle of each counterweight, preventing dynamic balance shifts due to human error. Furthermore, a unified positioning reference is crucial when multiple counterweights need to be installed to achieve complex balances. The positioning pin ensures that all counterweights are installed based on the same coordinate system, allowing the operator to clearly know the exact position of each counterweight relative to the center of rotation and its relationship to each other.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An amplitude-adjustable magnetic drive motor, characterized in that: It includes a rocker shaft upper plate (1) and a rocker shaft lower plate (2) arranged in parallel. An elastic support device (3) is fixedly connected between the rocker shaft upper plate (1) and the rocker shaft lower plate (2). A magnetic drive motor body is arranged between the rocker shaft upper plate (1) and the rocker shaft lower plate (2). The main body of the magnetic drive motor includes a lower base (5), an upper cover (6), a rotating shaft, a rotor assembly, and a stator assembly. The lower base (5) and the upper cover (6) together form the motor housing. The lower base (5) is fixedly installed on the upper surface of the lower plate (2) of the rocker shaft. The rotating shaft is rotatably supported in the motor housing by at least one pair of bearings (7). The rotor assembly is fixedly sleeved on the rotating shaft. The stator assembly is fixedly installed in the motor housing and electromagnetically coupled to the rotor assembly. The upper cover (6) is coaxially fixedly connected to the rotor assembly and rotates synchronously with the rotor assembly. The upper cover (6) has a plurality of mounting holes (8) radially arranged at an eccentric position on its upper surface. An adjustment assembly is provided above the upper cover (6). The adjustment assembly includes an adjustment seat (9), an adjustment bearing (10), and a bearing mounting plate (11). A fixed convex shaft (12) is provided at the center of the lower surface of the adjustment seat (9). The adjustment seat (9) is positioned by the fixed convex shaft (12) in conjunction with the mounting holes (8) on the upper surface of the upper cover (6). The inner ring of the adjustment bearing (10) is installed on the outside of the adjustment seat (9) with an interference fit. The outer ring of the adjustment bearing (10) is connected to the bearing mounting plate (11) with an interference fit. The bearing mounting plate (11) is fixedly connected to the lower surface of the rocker shaft upper plate (1). A counterweight (13) is installed on the side circumference of the upper cover (6).

2. The amplitude-adjustable magnetic drive motor according to claim 1, characterized in that: The number of mounting holes (8) is four, and the distances from the four mounting holes (8) to the central axis of the upper cover (6) are 3mm, 12.5mm, 26mm and 50mm respectively.

3. The amplitude-adjustable magnetic drive motor according to claim 1, characterized in that: The elastic support device (3) includes a lower fixed steel plate (31) and an upper spring steel plate (32). The lower fixed steel plate (31) is fixedly installed on the upper surface of the lower plate (2) of the rocker shaft. The lower fixed steel plate (31) is fixedly connected to one end of the magnetic drive middle plate (14) on both sides. The other end of the magnetic drive middle plate (14) is fixedly connected to one end of the two upper spring steel plates (32) respectively. The other end of the two upper spring steel plates (32) is fixedly connected to the lower surface of the upper plate (1) of the rocker shaft. The main body of the magnetic drive motor is located in the middle cavity of the magnetic drive middle plate (14).

4. The amplitude-adjustable magnetic drive motor according to claim 1, characterized in that: The outer edge of the upper surface of the cover (6) is provided with an annular slide rail (15), and multiple counterweights (13) are slidably installed on the annular slide rail (15). The position of the counterweights (13) along the annular slide rail (15) is adjustable and can be locked.

5. The amplitude-adjustable magnetic drive motor according to claim 4, characterized in that: The upper cover (6) has multiple threaded holes evenly distributed on the edge of its upper surface, and the counterweight (13) is connected and fixed by screws to the threaded holes at different positions.

6. The amplitude-adjustable magnetic drive motor according to claim 4, characterized in that: The stator assembly includes a magnet mounting sleeve (16) and a permanent magnet fixed to the inner wall of the magnet mounting sleeve (16). The magnet mounting sleeve (16) is coaxially fixedly connected to the upper cover (6). The magnetic field generated by the permanent magnet interacts with the motor stator coil, driving the rotor assembly to reciprocate. The counterweight (13) has a fan-shaped structure, and the arc surface of the counterweight (13) is in contact with the outer surface of the magnet mounting sleeve (16).

7. The amplitude-adjustable magnetic drive motor according to claim 4, characterized in that: The upper surface of the cover (6) is provided with a positioning hole, and the inner side of the counterweight (13) is provided with a positioning groove. The positioning groove and the positioning hole are engaged by a positioning pin to achieve circumferential positioning.

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