Magnetic field generator

Abstract

The invention discloses a magnetic field generating device, and relates to the technical field of magnetic localization. By arranging a motor, a driving circuit and other components on the upper part and arranging a permanent magnet, a counterweight, a connecting shaft and other high-speed rotating components on the bottom, the center of the rotating components is lowered, so that the vibration of the whole equipment during operation is smaller, and the generated magnetic field is more stable; the vibration abrasion of a mechanical part is also reduced, and the noise is reduced. In addition, the motor is internally provided with a permanent magnet stator or rotor which interferes with a magnetic field generated by equipment, the lower space can avoid the interference of the motor when the motor is used, and the magnetic positioning precision is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic positioning, in particular to a magnetic field generating device of low gravity center rotating permanent magnet. BACKGROUND

[0002] Magnetic positioning technology is a technology for determining the position and attitude of a target object by using the characteristics of a magnetic field. The core principle is based on the spatial distribution law of the magnetic field. The position information of the target (including three-dimensional coordinates and angles, etc.) is calculated 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 external known magnetic field, combined with the corresponding algorithm.

[0003] There are two methods for generating a regularly changing magnetic field at present: One is to use an energized coil (electromagnet) to generate a controllable electromagnetic field to realize positioning. By controlling the size, direction and frequency of the current, etc., the strength, direction and distribution of the electromagnetic field can be flexibly adjusted. However, this technology needs continuous power supply, has high energy consumption, and needs a complex power supply control system, and the device has relatively large volume and weight.

[0004] The other is to use 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 detects the change of the magnetic field strength and direction generated by the permanent magnet through a sensor, and then determines the position of the target object. This method has the characteristics of simple structure, low energy consumption and strong stability. The existing rotating permanent magnet positioning device adopts a conventional layout, in which the motor and circuit part are placed at the bottom of the device, and the high-speed rotating part is placed at the upper part. The overall height is 5-10 cm higher, and the vibration of the overall device is difficult to reduce during rotation. SUMMARY

[0005] In view of the above problems, the present application provides a magnetic field generating device for overcoming the above problems or at least partially solving the above problems.

[0006] The present application provides the following solutions: A magnetic field generating device, comprising: A mounting bracket, the lower end of the mounting bracket is connected with a lower shell, and the upper part of the mounting bracket is provided with a motor, and the output shaft of the motor extends to below the mounting bracket through the mounting bracket; A rotating magnetic field generating assembly, comprising a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, a permanent magnet and a non-magnetic counterweight; the first bevel gear is coaxial with the output shaft but not fixedly connected therewith, the second bevel gear is coaxial with the output shaft but not fixedly connected therewith and is fixedly connected with the lower housing, the third bevel gear and the fourth bevel gear are connected through a gear shaft and are meshingly connected with the first bevel gear and the second bevel gear respectively; the permanent magnet is fixedly connected with the third bevel gear, and the non-magnetic counterweight is fixedly connected with the fourth bevel gear. Wherein, the axis of the first bevel gear, the axis of the second bevel gear and the axis of the output shaft are all located on a first rotation axis, the axis of the gear shaft, the axis of the third bevel gear, the axis of the fourth bevel gear, the axis of the permanent magnet and the axis of the non-magnetic counterweight are all located on a second rotation axis; the first rotation axis and the second rotation axis are cross-distributed at 90°; the center of mass of the permanent magnet is located on the second rotation axis, the magnetization direction of the permanent magnet rotates in a plane perpendicular to the second rotation axis with gear movement; the rotating directions of the permanent magnet and the non-magnetic counterweight on the gear shaft are opposite.

[0007] Preferably: the moment of inertia of the non-magnetic counterweight rotating around the second rotation axis and the moment of inertia of the non-magnetic counterweight rotating around the first rotation axis are the same as the moment of inertia of the permanent magnet rotating around the second rotation axis and the moment of inertia of the permanent magnet rotating around the first rotation axis respectively.

[0008] Preferably: the density of the non-magnetic counterweight is the same as the density of the permanent magnet.

[0009] Preferably: the material of the permanent magnet comprises neodymium iron boron, and the material of the non-magnetic counterweight comprises 304 stainless steel.

[0010] Preferably: the permanent magnet and the non-magnetic counterweight comprise a circular ring shape.

[0011] Preferably: the motor comprises an outer rotor direct drive motor.

[0012] Preferably: the motor is connected with an optical encoder, and the motor is connected with the mounting bracket through a damping assembly.

[0013] Preferably: the damping assembly comprises a damping rubber pad.

[0014] Preferably: a silica gel inner housing is further included, which is used to reduce the noise transmitted from the inside of the device to the outside.

[0015] Preferably: an upper housing and a mounting platform are further included, and the lower housing is connected with the mounting platform.

[0016] According to the specific embodiments of the present application, the following technical effects are disclosed: The magnetic field generating device provided by the embodiment of the present application has the following technical effects: Of course, implementing any product of the present application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0018] Figure 1 is a structural schematic diagram of the magnetic field generating device provided by the embodiment of the present application after removing the upper shell; Figure 2 is a structural schematic diagram of the magnetic field generating device provided by the embodiment of the present application; Figure 3 is an installation and use schematic diagram of the magnetic field generating device provided by the embodiment of the present application.

[0019] In the figure: magnetic field generating device 100, mounting bracket 1, mounting platform 2, motor 3, output shaft 4, first bevel gear 5, second bevel gear 6, third bevel gear 7, fourth bevel gear 8, permanent magnet 9, non-magnetic counterweight 10, gear shaft 11, photoelectric encoder 12, silica gel inner shell 13, lower shell 14, upper shell 15. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0021] Referring to Figure 1 , Figure 2 , Figure 3 is a magnetic field generating device 100 provided by the embodiment of the present application, like Figure 1 ,Figure 2 、 Figure 3 The device can comprise: a mounting bracket 1, a lower end of the mounting bracket 1 is connected with the lower housing 14, an upper part of the mounting bracket 1 is provided with a motor 3, an output shaft 4 of the motor 3 penetrates through the mounting bracket 1 and extends below the mounting bracket 1; a rotating magnetic field generating assembly, the rotating magnetic field generating assembly comprises a first bevel gear 5, a second bevel gear 6, a third bevel gear 7, a fourth bevel gear 8, a permanent magnet 9 and a non-magnetic counterweight 10; the first bevel gear 5 is coaxial with the output shaft 4 and is not fixedly connected with the output shaft 4, the second bevel gear 6 is coaxial with the output shaft and is fixedly connected with the lower housing 14, the third bevel gear 7 and the fourth bevel gear 8 are connected through a gear shaft 11 and are respectively meshed with the first bevel gear 5 and the second bevel gear 6; the permanent magnet 9 is fixedly connected with the third bevel gear 7, and the non-magnetic counterweight 10 is fixedly connected with the fourth bevel gear 8; The axis of the first bevel gear 5, the axis of the second bevel gear 6 and the axis of the output shaft 4 are all located on a first rotation axis, the axis of the gear shaft 11, the axis of the third bevel gear 7, the axis of the fourth bevel gear 8, the axis of the permanent magnet 9 and the axis of the non-magnetic counterweight 10 are all located on a second rotation axis; the first rotation axis and the second rotation axis are distributed in a 90° cross manner; the center of mass of the permanent magnet 9 is located on the second rotation axis, the magnetization direction of the permanent magnet 9 rotates in a plane perpendicular to the second rotation axis with gear movement; the rotating directions of the permanent magnet 9 and the non-magnetic counterweight 10 on the gear shaft 11 are opposite.

[0022] The magnetic field generating device provided by the embodiment of the application sets the motor 3 driving the internal rotating magnetic field generating assembly on the upper side and sets the rotating magnetic field generating assembly below the mounting bracket 1, thereby lowering the gravity center of the whole generating device and ensuring that the whole device operates more stably. Meanwhile, the motor 3 magnetic field can also prevent electromagnetic interference on the rotating magnetic field generating assembly.

[0023] In order to further improve the stability of the device during operation, the embodiment of the application can also provide that the moment of inertia of the non-magnetic counterweight 10 rotating around the second rotation axis and the moment of inertia of the non-magnetic counterweight 10 rotating around the first rotation axis are respectively the same as the moment of inertia of the permanent magnet 9 rotating around the second rotation axis and the moment of inertia of the permanent magnet 9 rotating around the first rotation axis.

[0024] In actual use, the second bevel gear 6 is a fixed part, the first bevel gear 5, the third bevel gear 7 and the fourth bevel gear 8 are rotating parts, the third bevel gear 7 and the fourth bevel gear 8 are internally provided with non-magnetic bearings and are sleeved on the gear shaft 11, the motor 3 is arranged at the top of the magnetic field generating assembly, and the transmission assembly is arranged at the bottom of the magnetic field generator. Such an arrangement is favorable for reducing the gravity center of the transmission assembly and increasing stability. The output shaft 4 of the motor 3 is directly connected with the gear shaft 11, and the two axes are crossed at 90 degrees. The axes of the first bevel gear 5 and the second bevel gear 6 and the axis of the output shaft 4 of the motor 3 are all located on the first rotating shaft, and the axis of the gear shaft 11, the axes of the third bevel gear 7 and the fourth bevel gear 8, the axis of the permanent magnet 9 and the axis of the non-magnetic counterweight 10 are all located on the second rotating shaft.

[0025] In order to ensure that the weight of the permanent magnet 9 is close to that of the non-magnetic counterweight 10, the density of the non-magnetic counterweight 10 can be the same as that of the permanent magnet 9. Further, the material of the permanent magnet 9 includes neodymium iron boron, and the material of the non-magnetic counterweight 10 includes 304 stainless steel.

[0026] It can be understood that the shape of the permanent magnet 9 and the non-magnetic counterweight 10 can adopt various shapes. For example, in an implementation, the permanent magnet 9 and the non-magnetic counterweight 10 can adopt a circular ring shape.

[0027] The permanent magnet 9 and the non-magnetic counterweight 10 are circular ring shapes and are fixed on the third bevel gear 7 and the fourth bevel gear 8 respectively and rotate together with the third bevel gear 7 and the fourth bevel gear 8. The material of the permanent magnet 9 is a strong magnetic material (such as neodymium iron boron), the center of mass is located on the second rotating shaft, and the magnetization direction rotates in the plane perpendicular to the second rotating shaft with the gear movement. In actual implementation, the permanent magnet 9 can have different shapes, as long as the center of mass position and the magnetization direction meet the above conditions. The non-magnetic counterweight 10 is made of a material with a density close to that of the permanent magnet 9, such as 304 stainless steel. The rotational inertia of the non-magnetic counterweight 10 rotating around the second rotating shaft and the rotational inertia of the non-magnetic counterweight 10 rotating around the first rotating shaft should be the same as those of the permanent magnet 9. In this way, the stability of the entire device can be ensured during rotation.

[0028] The motor 3 can adopt various forms. For example, in an implementation, the motor 3 can include an outer rotor direct drive motor 3. Further, the motor 3 is connected with a photoelectric encoder 12, and the motor 3 is connected with the mounting bracket 1 through a damping assembly.

[0029] The motor 3 drives the output shaft 4 to rotate, the output shaft 4 drives the gear shaft 11 to rotate, the first bevel gear 5 meshes with the third bevel gear 7 and the fourth bevel gear 8, the rotation of the gear shaft 11 drives the third bevel gear 7 and the fourth bevel gear 8 to rotate, and further drives the permanent magnet 9 and the non-magnetic counterweight 10 to rotate, forming a compound motion.

[0030] The rotation directions of the permanent magnet 9 and the non-magnetic counterweight 10 on the gear shaft 11 are opposite, and the reverse rotation allows the Euler force of the non-magnetic counterweight 10 to balance the Euler force of the permanent magnet 9, thereby minimizing the gyro effect and ensuring the stability of the device.

[0031] The motor 3 can adopt an outer rotor direct drive motor 3, which has greater torque than traditional motors and can directly drive larger or higher load permanent magnet assemblies. When the magnetic field strength needs to be quickly changed, the powerful torque ensures the driving ability of the motor 3, ensures the rapid and efficient adjustment process, meets the dynamic response requirements of the magnetic field generator, and is especially suitable for complex adjustment scenes that require multiple groups of permanent magnets to act together. The rotor mass of the outer rotor direct drive motor 3 is distributed on the outer side, and the moment of inertia is relatively large. This feature makes it able to effectively resist load fluctuations and external disturbances when driving the permanent magnet assembly to rotate and adjust the magnetic field, and the operation is more stable. The motor 3 is provided with an optical encoder 12 at the end, which is used to accurately control the rotation speed of the motor 3.

[0032] In order to reduce the vibration of the whole device caused by the motor 3, the damping assembly can be provided in the embodiment of the application. The motor 3 is mounted on the damping assembly, and the damping assembly is composed of a damping rubber pad, which has a supporting effect and is used to reduce the vibration of the gear rotating assembly transmitted to the outside.

[0033] Further, in order to reduce the noise generated during the use of the device, the silica gel inner shell 13 can be provided in the embodiment of the application, which is used to reduce the noise transmitted from the inside of the device to the outside. The silica gel inner shell 13 is used to reduce the noise transmitted from the rotating assembly to the outside, which is usually caused by the meshing of the gears and the friction of the bearing rollers. If the noise is not eliminated, it may interfere with the user.

[0034] Further, in order to protect the rotating magnetic field generating assembly and improve the safety during use of the device, the upper shell 15 and the mounting platform 2 can be provided in the embodiment of the application, and the lower shell 14 is connected with the mounting platform 2.

[0035] It can be seen that the magnetic field generating device provided by the embodiment of the application is driven by the motor 3, the motor 3 has a permanent magnet stator or rotor inside, and has inevitable interference to the magnetic field generated by the device. The low gravity center magnetic field generating device can be placed on the support above the operating bed during use, the space below the generating device can avoid the interference of the motor 3, and the magnetic positioning accuracy is higher.

[0036] In summary, the magnetic field generating device provided by the application places the motor and driving circuit components above, and places the high-speed rotating components such as permanent magnets, counterweights and connecting shafts at the bottom, reduces the center of the rotating components, makes the vibration of the whole device smaller during operation, makes the generated magnetic field more stable, also reduces the vibration and wear of the mechanical part, and reduces the noise. In addition, the motor has a permanent magnet stator or rotor inside, which has interference to the magnetic field generated by the device, and the space below can avoid the interference of the motor during use, and the magnetic positioning accuracy is higher.

[0037] It should be noted that in this document, the terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0038] From the above description of the embodiments, those skilled in the art can clearly understand that the application can be realized by means of software plus the necessary general hardware platform. Based on such understanding, the technical solutions of the application can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments or some parts of the embodiments.

[0039] The various embodiments described in this specification are presented as examples of the application. Each example is provided by way of best mode, and variations of or additions to these examples can be possible. For example, the various embodiments described in this specification can be combined in different combinations. Further, other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. For example, to implement a system embodiment, one can implement a method embodiment and one or more system modules to perform the method embodiment. Each of the various embodiments can be implemented alone or in combination with any other embodiments. It is therefore intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

[0040] Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the application shall fall within the scope of the protection of the application.

Claims

1. A magnetic field generating device, characterized by comprising: The application relates to a motorized rotating magnetic field generating device, which comprises the following parts: a mounting bracket, the lower end of which is connected with a lower shell, and the upper part of the mounting bracket is provided with a motor, the output shaft of the motor penetrating through the mounting bracket and extending below the mounting bracket; a rotating magnetic field generating assembly, which comprises a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, a permanent magnet and a non-magnetic counterweight; the first bevel gear is coaxially connected with the output shaft without being fixed, the second bevel gear is coaxially connected with the output shaft without being fixed and is fixed with the lower shell, the third bevel gear and the fourth bevel gear are connected through a gear shaft and are meshed with the first bevel gear and the second bevel gear respectively; the permanent magnet is fixed with the third bevel gear, and the non-magnetic counterweight is fixed with the fourth bevel gear; wherein the axis of the first bevel gear, the axis of the second bevel gear and the axis of the output shaft are located on a first rotating shaft, the axis of the gear shaft, the axis of the third bevel gear, the axis of the fourth bevel gear, the axis of the permanent magnet and the axis of the non-magnetic counterweight are located on a second rotating shaft; the first rotating shaft and the second rotating shaft are cross-distributed at an angle of 90 degrees; the center of mass of the permanent magnet is located on the second rotating shaft, the magnetization direction of the permanent magnet rotates in a plane perpendicular to the second rotating shaft with gear movement; the rotating directions of the permanent magnet and the non-magnetic counterweight on the gear shaft are opposite.

2. The magnetic field generating device according to claim 1, characterized by The moment of inertia of the non-magnetic counterweight rotating around the second rotating shaft and the moment of inertia of the non-magnetic counterweight rotating around the first rotating shaft are the same as the moment of inertia of the permanent magnet rotating around the second rotating shaft and the moment of inertia of the permanent magnet rotating around the first rotating shaft respectively.

3. The magnetic field generating device according to claim 1, characterized by The density of the non-magnetic counterweight is the same as the density of the permanent magnet.

4. The magnetic field generating device according to claim 3, characterized by The material of the permanent magnet comprises neodymium iron boron, and the material of the non-magnetic counterweight comprises 304 stainless steel.

5. The magnetic field generating device according to claim 1, wherein The permanent magnet and the non-magnetic counterweight comprise a circular ring shape.

6. The magnetic field generating device according to claim 1, wherein The motor comprises an outer rotor direct drive motor.

7. The magnetic field generating device according to claim 1, wherein The motor is connected with a photoelectric encoder, and the motor is connected with the mounting bracket through a damping assembly.

8. The magnetic field generating device according to claim 7, characterized by The damping assembly comprises a damping rubber pad.

9. The magnetic field generating device according to claim 1, wherein A silica gel inner shell is further arranged, which is used for reducing noise transmitted from the inside of the device to the outside.

10. The magnetic field generating device according to claim 1, wherein An upper shell and a mounting platform are further arranged, and the lower shell is connected with the mounting platform.

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