Magnetic field generator

Abstract

The invention discloses a magnetic field generator, and relates to the technical field of magnetic positioning, a motor drives a permanent magnet assembly to rotate in a certain mode through a belt transmission and gear transmission assembly, and a time-varying magnetic field is generated in a three-dimensional space. Compared with a traditional bevel gear structure, the belt transmission structure has the advantages of being low in noise and stable in transmission. Meanwhile, the rotation directions of the permanent magnet and the non-magnetic counterweight on the first rotating shaft and the second rotating shaft are opposite, and the Euler force of the non-magnetic counterweight is allowed to balance the Euler force of the permanent magnet through reverse rotation, so that the gyroscopic effect is minimized, and the stability of equipment is ensured.

Description

Technical Field

[0001] This invention relates to the field of magnetic positioning technology, and in particular to a magnetic field generator based on a belt-driven rotating permanent magnet. Background Technology

[0002] Magnetic positioning technology is a technique that uses the characteristics of magnetic fields to determine the position and orientation of a target object. Its core principle is based on the spatial distribution law of magnetic fields. By detecting the magnetic field generated by the magnet (such as a permanent magnet or an electromagnet) carried on the target object, or the disturbance of the target object to a known external magnetic field, the position information of the target (including three-dimensional coordinates and angles) is calculated by combining the corresponding algorithms.

[0003] Currently, there are two methods for generating regularly changing magnetic fields. One method uses a current-carrying coil (electromagnet) to generate a controllable electromagnetic field for positioning. By controlling parameters such as the magnitude, direction, and frequency of the current, the intensity, direction, and distribution of the electromagnetic field can be flexibly adjusted. However, this technology requires continuous power supply, resulting in high energy consumption, and necessitates a complex power control system, leading to relatively large equipment size and weight. The other method uses a mechanical structure to drive a permanent magnet (such as a neodymium iron boron permanent magnet) to move regularly in three-dimensional space, thereby generating a regularly changing magnetic field. The positioning system uses sensors to detect changes in the intensity and direction of the magnetic field generated by the permanent magnet, thus determining the position of the target object. This method features simple structure, low energy consumption, and high stability.

[0004] However, existing devices that use mechanical structures to drive permanent magnets to generate regularly changing magnetic fields typically employ gear transmission, which suffers from high noise levels. Furthermore, gear transmission methods exhibit slow adjustment of magnetic field strength at high speeds and operational instability due to load fluctuations and external disturbances. Summary of the Invention

[0005] In view of the above problems, the present invention provides a magnetic field generator for overcoming or at least partially solving the above problems. It can be widely used in scientific research, medical equipment, industrial production and other scenarios that require magnetic fields.

[0006] This invention provides the following solution: A magnetic field generator, comprising: A turntable, wherein the turntable is provided with a central rotating shaft that runs through its upper and lower surfaces; A magnet assembly includes a permanent magnet, a non-magnetic counterweight, a first U-shaped mounting bracket, a second U-shaped mounting bracket, a first rotating shaft, and a second rotating shaft; both the first U-shaped mounting bracket and the second U-shaped mounting bracket are connected to the upper surface of the turntable, the first rotating shaft is hinged to the first U-shaped mounting bracket, the second rotating shaft is hinged to the second U-shaped mounting bracket, and the first rotating shaft and the second rotating shaft are parallel to each other and symmetrical with respect to the intermediate rotating shaft; A belt drive assembly includes a first driving pulley, a second driving pulley, a first driven pulley, and a second driven pulley; the first driving pulley and the second driving pulley are both located above the upper surface of the turntable and are both fixedly connected to the intermediate rotating shaft; A rotary drive assembly, which is respectively connected to the intermediate rotating shaft and the turntable; The non-magnetic counterweight and the first driven wheel are both fixedly connected to the first rotating shaft, the first rotating shaft is hinged to the first U-shaped mounting bracket, the permanent magnet and the second driven wheel are both fixedly connected to the second rotating shaft; the first driving wheel and the first driven wheel are connected by a first belt, and the second driving wheel and the second driven wheel are connected by a second belt. The rotary drive assembly is used to drive the turntable to rotate so that the permanent magnet and the non-magnetic counterweight revolve around the intermediate axis, and drive the intermediate axis to rotate so that the intermediate axis drives the first drive wheel and the second drive wheel to rotate, and after transmission, the permanent magnet and the non-magnetic counterweight rotate around their own axis.

[0007] Preferably, the permanent magnet is made of a strong magnetic material, the center of mass of the permanent magnet is located on the first rotating shaft, and the magnetization direction of the permanent magnet rotates with the rotation drive assembly in a plane perpendicular to the first rotating shaft.

[0008] Preferably, the moment of inertia of the non-magnetic counterweight rotating about the second axis is the same as the moment of inertia of the permanent magnet rotating about the first axis.

[0009] Preferably, the permanent magnet has the same shape as the non-magnetic counterweight.

[0010] Preferably, the rotary drive assembly includes a motor, a first large gear, a second large gear, a first small gear, and a second small gear; The first pinion and the first large gear are both fixed on the motor shaft, the second large gear is fixed on the turntable, and the intermediate shaft extends through the second large gear to below it; the second pinion is located below the second large gear and is fixedly connected to the intermediate shaft; the first large gear meshes with the second pinion, and the second large gear meshes with the first pinion.

[0011] Preferably, the first large gear and the second large gear have the same number of teeth, module, and tooth profile, and the first small gear and the second small gear have the same number of teeth, module, and tooth profile.

[0012] Preferably, the rotational speed of the permanent magnet and the non-magnetic counterweight is determined by the motor speed, the transmission ratio between the second pinion and the first gear, the transmission ratio between the first driving wheel and the first driven wheel, and the transmission ratio between the second driving wheel and the second driven wheel.

[0013] Preferably, the transmission ratio is 1:1.

[0014] Preferably, the motor includes an external rotor direct drive motor.

[0015] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects: This application provides a magnetic field generator in which a motor drives a permanent magnet assembly to rotate in a specific manner via a belt drive and gear drive assembly, generating a time-varying magnetic field in three-dimensional space. Compared to traditional bevel gear structures, the belt drive structure offers advantages such as lower noise and smoother transmission. Furthermore, the permanent magnet and non-magnetic counterweight rotate in opposite directions on the first and second shafts. This reverse rotation allows the Euler force of the non-magnetic counterweight to balance the Euler force of the permanent magnet, thereby minimizing the gyroscopic effect and ensuring the stability of the device.

[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the magnetic field generator provided in an embodiment of the present invention; Figure 2 This is another structural schematic diagram of the magnetic field generator provided in an embodiment of the present invention.

[0019] In the diagram: 1. Central shaft; 2. First driving wheel; 3. Second driven wheel; 4. Non-magnetic counterweight; 5. Second shaft; 6. Second belt; 7. Second driving wheel; 8. First shaft; 9. Permanent magnet; 10. First driven wheel; 11. First belt; 12. First pinion; 13. First gear; 14. Motor; 15. Turntable; 16. Second gear; 17. Second pinion. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0021] See Figure 1 , Figure 2 This is a magnetic field generator provided in an embodiment of the present invention, such as... Figure 1 , Figure 2 As shown, the generator may include: Turntable 15, wherein the turntable 15 is provided with a central rotating shaft 1 that passes through its upper and lower surfaces; The magnet assembly includes a permanent magnet 9, a non-magnetic counterweight 4, a first U-shaped mounting bracket, a second U-shaped mounting bracket, a first rotating shaft 8, and a second rotating shaft 5; both the first U-shaped mounting bracket and the second U-shaped mounting bracket are connected to the upper surface of the turntable 15, the first rotating shaft 8 is hinged to the first U-shaped mounting bracket, the second rotating shaft 5 is hinged to the second U-shaped mounting bracket, and the first rotating shaft 8 and the second rotating shaft 5 are parallel to each other and symmetrical with respect to the intermediate rotating shaft 1; The belt drive assembly includes a first driving pulley 2, a second driving pulley 7, a first driven pulley 10, and a second driven pulley 3; the first driving pulley 2 and the second driving pulley 7 are both located above the upper surface of the turntable 15 and are both fixedly connected to the intermediate rotating shaft 1; A rotary drive assembly is connected to the intermediate rotating shaft 1 and the turntable 15 respectively. The non-magnetic counterweight 4 and the first driven wheel 10 are both fixedly connected to the first rotating shaft 8, the first rotating shaft 8 is hinged to the first U-shaped mounting bracket, the permanent magnet 9 and the second driven wheel 3 are both fixedly connected to the second rotating shaft 5; the first driving wheel 2 and the first driven wheel 10 are connected by a first belt 11, and the second driving wheel 7 and the second driven wheel 3 are connected by a second belt 6. The rotary drive assembly is used to drive the turntable 15 to rotate so that the permanent magnet 9 and the non-magnetic counterweight 4 revolve around the intermediate shaft 1, and drive the intermediate shaft 1 to rotate so that the intermediate shaft 1 drives the first drive wheel 2 and the second drive wheel 7 to rotate, and after transmission, the permanent magnet 9 and the non-magnetic counterweight 4 rotate around their own shaft.

[0022] The magnetic field generator provided in this application embodiment allows the magnet assembly to revolve around the central axis 1 during the rotation of the turntable 15. Simultaneously, a belt drive assembly transmits power, enabling the permanent magnet 9 to rotate around the second axis 5, thereby generating a periodically changing magnetic field. Compared to the traditional method of power transmission using bevel gears, belt drive makes the generator's operation more stable and produces less noise.

[0023] The belt drive assembly provided in this embodiment has a first driving pulley 2 and a second driving pulley 7 fixed on an intermediate rotating shaft 1, a first driven pulley 10 fixed on a first rotating shaft 8, and a second driven pulley 3 fixed on a second rotating shaft 5. The transmission assembly consisting of the first driving pulley 2, the first driven pulley 10, and the first belt 11 drives the permanent magnet 9 to rotate, while the transmission assembly consisting of the second driving pulley 7, the second driven pulley 3, and the second belt 6 drives the non-magnetic counterweight 4 to rotate. The first rotating shaft 8 and the second rotating shaft 5 are parallel and symmetrical about the intermediate rotating shaft 1. Compared to gear structures, belt drive structures offer advantages such as lower noise and smoother transmission.

[0024] To further improve the stability of the generator's operation, this embodiment of the application may also provide that the material of the permanent magnet 9 includes a strong magnetic material, the center of mass of the permanent magnet 9 is located on the first rotating shaft 8, and the magnetization direction of the permanent magnet 9 rotates in a plane perpendicular to the first rotating shaft 8 as the rotation drive assembly moves.

[0025] The moment of inertia of the non-magnetic counterweight 4 rotating about the second axis 5 is the same as the moment of inertia of the permanent magnet 9 rotating about the first axis 8. The shape of the permanent magnet 9 is the same as the shape of the non-magnetic counterweight 4.

[0026] Both the permanent magnet 9 and the non-magnetic counterweight 4 can be ring-shaped, fixed on the first rotating shaft 8 and the second rotating shaft 5 respectively, and rotate together with the first driving wheel 2 and the second driving wheel 7. The permanent magnet 9 is made of a strong magnetic material (such as neodymium iron boron), with its center of mass located on the first rotating shaft 8, and its magnetization direction rotates with the gear movement in a plane perpendicular to the first rotating shaft 8. In actual implementation, the permanent magnet 9 can have different shapes, as long as the position of its center of mass and the magnetization direction meet the above conditions. The non-magnetic counterweight 4 is made of a material with a density similar to that of the permanent magnet 9, such as 304 stainless steel. The moment of inertia of the non-magnetic counterweight 4 rotating around the second rotating shaft 5 should be the same as that of the permanent magnet 9, which ensures the stability of the entire device during rotation.

[0027] It is understood that the rotary drive assembly provided in this application embodiment can both drive the turntable 15 to rotate and drive the intermediate shaft 1 to rotate. In practical applications, the rotary drive assembly can adopt various structural forms. For example, in one implementation, this application embodiment can provide the rotary drive assembly including a motor 14, a first large gear 13, a second large gear 16, a first small gear 12, and a second small gear 17. The first pinion 12 and the first gear 13 are both fixed on the rotating shaft of the motor 14, the second gear 16 is fixed on the turntable 15, and the intermediate rotating shaft 1 extends through the second gear 16 to below the second gear 16; the second pinion 17 is located below the second gear 16 and is fixedly connected to the intermediate rotating shaft 1; the first gear 13 is meshed with the second pinion 17, and the second gear 16 is meshed with the first pinion 12.

[0028] Furthermore, the first large gear 13 and the second large gear 16 have the same number of teeth, module, and tooth profile, and the first small gear 12 and the second small gear 17 have the same number of teeth, module, and tooth profile. The rotational speed of the permanent magnet 9 and the non-magnetic counterweight 4 is determined by the rotational speed of the motor 14, the transmission ratio between the second small gear 17 and the first large gear 13, the transmission ratio between the first driving wheel 2 and the first driven wheel 10, and the transmission ratio between the second driving wheel 7 and the second driven wheel 3. Preferably, the transmission ratio is 1:1.

[0029] The motor 14 includes an external rotor direct-drive motor. Compared with traditional motors, the external rotor direct-drive motor 14 has a larger torque to directly drive permanent magnet components with larger mass or higher load. When a rapid change in magnetic field strength is required, the strong torque ensures the motor's driving capability, ensuring a rapid and efficient adjustment process, meeting the dynamic response requirements of the magnetic field generator. It is especially suitable for complex adjustment scenarios that require driving multiple sets of permanent magnets to work together. The rotor mass of the external rotor direct-drive motor is distributed on the outer side, resulting in a relatively large moment of inertia. This characteristic enables it to effectively resist load fluctuations and external disturbances when driving the permanent magnet components to rotate and adjust the magnetic field, resulting in smoother operation.

[0030] In the gear assembly, the first pinion 12 and the first large gear 13 are fixed to the shaft of the motor 14. The second large gear 16 is fixed to the turntable 15, and the second pinion 17 is fixed to the intermediate shaft 1. The intermediate shaft 1 passes through the middle of the second large gear 16, and the intermediate shaft 1 and the second large gear 16 are connected by bearings and other parts to ensure that the intermediate shaft 1 and the turntable 15 can rotate independently. The first large gear 13 and the second large gear 16 have the same number of teeth, module, and tooth profile, and the first pinion 12 and the second pinion 17 have the same number of teeth, module, and tooth profile. This ensures that the first large gear 13 and the second pinion 17, the second large gear 16, and the first pinion 12 are simultaneously meshed.

[0031] In operation, the generator operates by having motor 14 drive the first pinion 12 to rotate, which in turn drives the second large gear 16 to rotate, which in turn drives the turntable 15 to rotate, causing the permanent magnet 9 and the non-magnetic counterweight 4 to revolve around the central shaft 1. Motor 14 also drives the first large gear 13 to rotate, which in turn drives the central shaft 1 to rotate, which in turn drives the first driving wheel 2 and the second driving wheel 7 to rotate, causing the permanent magnet 9 and the non-magnetic counterweight 4 to rotate around their own axes. The two rotational motions are superimposed to form a composite motion.

[0032] The revolution speed of the permanent magnet 9 and the non-magnetic counterweight 4 around the central shaft 1 is determined by the rotation speed of the motor 14 and the transmission ratio between the first pinion 12 and the second large gear 16. The rotation speed of the permanent magnet 9 and the non-magnetic counterweight 4 is determined by the rotation speed of the motor 14, the transmission ratio between the second pinion 17 and the first large gear 13, the transmission ratio between the first driving wheel 2 and the first driven wheel 10, and the transmission ratio between the second driving wheel 7 and the second driven wheel 3. In this example, the diameters of the first driving wheel 2, the first driven wheel 10, the second driving wheel 7, and the second driven wheel 3 are all equal, so the transmission ratio between them is 1:1.

[0033] Let the speed of motor 14 be... The number of teeth of the first pinion 12 is The number of teeth on the first large gear 13 is The revolution speed of the permanent magnet 9 and the non-magnetic counterweight 4 around the central axis 1 is... :

[0034] Rotation speed of permanent magnet 9 and non-magnetic counterweight 4 :

[0035] In summary, the magnetic field generator provided in this application uses a motor to drive a permanent magnet assembly to rotate in a specific manner via belt drive and gear drive components, generating a time-varying magnetic field in three-dimensional space. Compared to traditional bevel gear structures, the belt drive structure offers advantages such as lower noise and smoother transmission. Furthermore, the permanent magnet and non-magnetic counterweight rotate in opposite directions on the first and second shafts. This reverse rotation allows the Euler force of the non-magnetic counterweight to balance the Euler force of the permanent magnet, thereby minimizing the gyroscopic effect and ensuring the stability of the device.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0038] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A magnetic field generator, characterized in that, include: A turntable, wherein the turntable is provided with a central rotating shaft that runs through its upper and lower surfaces; A magnet assembly includes a permanent magnet, a non-magnetic counterweight, a first U-shaped mounting bracket, a second U-shaped mounting bracket, a first rotating shaft, and a second rotating shaft; both the first U-shaped mounting bracket and the second U-shaped mounting bracket are connected to the upper surface of the turntable, the first rotating shaft is hinged to the first U-shaped mounting bracket, the second rotating shaft is hinged to the second U-shaped mounting bracket, and the first rotating shaft and the second rotating shaft are parallel to each other and symmetrical with respect to the intermediate rotating shaft; A belt drive assembly includes a first driving pulley, a second driving pulley, a first driven pulley, and a second driven pulley; the first driving pulley and the second driving pulley are both located above the upper surface of the turntable and are both fixedly connected to the intermediate rotating shaft; A rotary drive assembly, which is respectively connected to the intermediate rotating shaft and the turntable; The non-magnetic counterweight and the first driven wheel are both fixedly connected to the first rotating shaft, the first rotating shaft is hinged to the first U-shaped mounting bracket, the permanent magnet and the second driven wheel are both fixedly connected to the second rotating shaft; the first driving wheel and the first driven wheel are connected by a first belt, and the second driving wheel and the second driven wheel are connected by a second belt. The rotary drive assembly is used to drive the turntable to rotate so that the permanent magnet and the non-magnetic counterweight revolve around the intermediate axis, and drive the intermediate axis to rotate so that the intermediate axis drives the first drive wheel and the second drive wheel to rotate, and after transmission, the permanent magnet and the non-magnetic counterweight rotate around their own axis.

2. The magnetic field generator according to claim 1, characterized in that, The permanent magnet is made of a strong magnetic material, the center of mass of the permanent magnet is located on the first rotating shaft, and the magnetization direction of the permanent magnet rotates in a plane perpendicular to the first rotating shaft as the rotation drive assembly moves.

3. The magnetic field generator according to claim 1, characterized in that, The moment of inertia of the non-magnetic counterweight rotating about the second axis is the same as the moment of inertia of the permanent magnet rotating about the first axis.

4. The magnetic field generator according to claim 1, characterized in that, The permanent magnet has the same shape as the non-magnetic counterweight.

5. The magnetic field generator according to claim 1, characterized in that, The rotary drive assembly includes a motor, a first large gear, a second large gear, a first small gear, and a second small gear; The first pinion and the first large gear are both fixed on the motor shaft, the second large gear is fixed on the turntable, and the intermediate shaft extends through the second large gear to below it; the second pinion is located below the second large gear and is fixedly connected to the intermediate shaft; the first large gear meshes with the second pinion, and the second large gear meshes with the first pinion.

6. The magnetic field generator according to claim 5, characterized in that, The first large gear and the second large gear have the same number of teeth, module, and tooth profile, and the first small gear and the second small gear have the same number of teeth, module, and tooth profile.

7. The magnetic field generator according to claim 5, characterized in that, The rotational speed of the permanent magnet and the non-magnetic counterweight is determined by the motor speed, the transmission ratio between the second pinion and the first gear, the transmission ratio between the first driving wheel and the first driven wheel, and the transmission ratio between the second driving wheel and the second driven wheel.

8. The magnetic field generator according to claim 7, characterized in that, The transmission ratio is 1:

1.

9. The magnetic field generator according to claim 5, characterized in that, The motor includes an external rotor direct drive motor.

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