Load loading device

Abstract

The invention discloses a load loading device which is used for applying a load to a to-be-tested object, and the to-be-tested object is provided with a first component and a second component which can generate relative rotation. The load loading device comprises a mounting seat, a fixed magnetic assembly and a movable magnetic assembly; the first component is mounted on the mounting seat; the fixed magnetic assembly is mounted on the mounting seat and is opposite to the to-be-detected object in a first direction; the first direction is the extending direction of the rotating axis of the first component and the second component; the movable magnetic assembly is mounted on the second component; the movable magnetic assembly and the fixed magnetic assembly are arranged in a spaced mode in the first direction so as to generate magnetic force, the magnetic force is used for applying in-plane bending moment in a target plane to the movable magnetic assembly, and the target plane is perpendicular to the first direction.

Description

Technical Field

[0001] This application relates to the technical field of load tests, and more particularly, to a load loading device. Background Art

[0002] In the related art, a load loading device can be used to perform load tests on some components to simulate the stress conditions they are subjected to under actual working conditions, thereby verifying whether the service life of the components meets the relevant requirements. However, the load loading devices in the related art are prone to failure problems in some complex environments, which in turn affects the normal progress of the tests. Summary of the Invention

[0003] An embodiment of this application provides a load loading device, which effectively solves the problem of easy failure of tests in the related art through the non-contact design of the magnetic components.

[0004] The load loading device of the embodiment of this application is used to apply a load to a test object, and the test object has a first component and a second component that can rotate relative to each other; it includes:

[0005] A mounting seat for mounting the first component;

[0006] A fixed magnetic assembly, mounted on the mounting seat and disposed opposite to the test object in a first direction; wherein, the first direction is the extending direction of the rotation axis of the first component and the second component; and

[0007] A movable magnetic assembly, mounted on the second component; the movable magnetic assembly and the fixed magnetic assembly are arranged at intervals in the first direction to generate a magnetic force, and the magnetic force is used to apply an in-plane bending moment within a target plane to the movable magnetic assembly, and the target plane is perpendicular to the first direction.

[0008] According to some embodiments of this application, the movable magnetic assembly includes a first movable magnetic member and a second movable magnetic member, the first movable magnetic member and the second movable magnetic member are arranged at intervals along a second direction and symmetrically arranged along the rotation axis, wherein, the second direction is perpendicular to the first direction, a magnetic attractive force is formed between the first movable magnetic member and the fixed magnetic assembly, and a magnetic repulsive force is formed between the second movable magnetic member and the fixed magnetic assembly.

[0009] According to some embodiments of this application, the fixed magnetic assembly includes a first fixed magnetic member in a circular ring shape, and the axis of the first fixed magnetic member is collinear with the rotation axis;

[0010] The positive projections of the first fixed magnetic member and the first movable magnetic member on the target plane have an overlapping first projection, and the polarities of the mutually facing surfaces of the corresponding parts of the first fixed magnetic member and the first movable magnetic member in the first projection are opposite;

[0011] The positive projections of the first fixed magnetic member and the second movable magnetic member on the target plane have an overlapping second projection, and the polarities of the mutually facing surfaces of the corresponding parts of the first fixed magnetic member and the second movable magnetic member in the second projection are the same.

[0012] According to some embodiments of the present application, the fixed magnetic assembly further includes a second fixed magnetic member, and the first fixed magnetic member surrounds the outer periphery of the second fixed magnetic member; the magnetization directions of the first fixed magnetic member and the second fixed magnetic member are opposite and parallel to the first direction;

[0013] The first movable magnetic member includes a first movable permanent magnet and a second movable permanent magnet. The positive projections of the first movable permanent magnet and the first fixed magnetic member on the target plane have an overlapping third projection, and the magnetization direction of the first fixed magnetic member corresponding to the third projection of the first movable permanent magnet is the same; the positive projections of the second movable permanent magnet and the second fixed magnetic member on the target plane have an overlapping fourth projection, and the magnetization direction of the second fixed magnetic member corresponding to the fourth projection of the second movable permanent magnet is the same;

[0014] The second movable magnetic member includes a third movable permanent magnet and a fourth movable permanent magnet. The positive projections of the third movable permanent magnet and the first fixed magnetic member on the target plane have an overlapping fifth projection, and the magnetization direction of the first fixed magnetic member corresponding to the fifth projection of the third movable permanent magnet is opposite; the positive projections of the fourth movable permanent magnet and the second fixed magnetic member on the target plane have an overlapping sixth projection, and the magnetization direction of the second fixed magnetic member corresponding to the sixth projection of the fourth movable permanent magnet is opposite.

[0015] According to some embodiments of the present application, the first movable magnetic member further includes a fifth movable permanent magnet, and the fifth movable permanent magnet is disposed between the first movable permanent magnet and the second movable permanent magnet. The magnetization direction of the fifth movable permanent magnet is: from the first departing permanent magnet to the first pointing permanent magnet; wherein, the first departing permanent magnet is the movable permanent magnet with the magnetization direction departing from the fixed magnetic assembly among the first movable permanent magnet and the second movable permanent magnet, and the first pointing permanent magnet is the movable permanent magnet with the magnetization direction pointing to the fixed magnetic assembly among the first movable permanent magnet and the second movable permanent magnet;

[0016] The second movable magnetic member further includes a sixth movable permanent magnet disposed between the third movable permanent magnet and the fourth movable permanent magnet. The magnetization direction of the sixth movable permanent magnet is from the second departing permanent magnet to the second pointing permanent magnet, where the second departing permanent magnet is the movable permanent magnet with a magnetization direction departing from the fixed magnetic assembly among the third movable permanent magnet and the fourth movable permanent magnet, and the second pointing permanent magnet is the movable permanent magnet with a magnetization direction pointing to the fixed magnetic assembly among the third movable permanent magnet and the fourth movable permanent magnet.

[0017] According to some embodiments of the present application, the second fixed magnetic member is circular ring-shaped, and the axis of the second fixed magnetic member is collinear with the rotation axis.

[0018] According to some embodiments of the present application, at least one of the first fixed magnetic member and the second fixed magnetic member is a permanent magnet.

[0019] According to some embodiments of the present application, the movable magnetic assembly further includes a third movable magnetic member and a fourth movable magnetic member, which are spaced apart along a third direction and symmetrically arranged along the rotation axis; wherein the third direction is perpendicular to the first direction.

[0020] A first magnetic force is formed between the third movable magnetic member and the fixed magnetic assembly, and a second magnetic force is formed between the fourth movable magnetic member and the fixed magnetic assembly.

[0021] Both the first magnetic force and the second magnetic force are magnetic attractive forces; or both the first magnetic force and the second magnetic force are magnetic repulsive forces.

[0022] According to some embodiments of the present application, both the third movable magnetic member and the fourth movable magnetic member are permanent magnets.

[0023] There is an overlapping seventh projection of the orthographic projections of the third movable magnetic member and the fixed magnetic assembly on the target plane, and the polarities of the mutually facing surfaces of the part of the fixed magnetic assembly corresponding to the seventh projection and the third movable magnetic member exhibit a first polarity relationship.

[0024] There is an overlapping eighth projection of the orthographic projections of the fourth movable magnetic member and the fixed magnetic assembly on the target plane, and the polarities of the mutually facing surfaces of the part of the fixed magnetic assembly corresponding to the eighth projection and the fourth movable magnetic member exhibit the first polarity relationship.

[0025] Wherein, the first polarity relationship is the same polarity or opposite polarities.

[0026] According to some embodiments of the present application, both the third movable magnetic member and the fourth movable magnetic member are made of soft magnetic materials.

[0027] One embodiment in the above application has at least the following advantages or beneficial effects:

[0028] In the load loading device according to the embodiment of the present application, the movable magnetic assembly and the fixed magnetic assembly are spaced apart in the extending direction of the rotation axes of the first member and the second member to generate a magnetic force, which is used to apply an in-plane bending moment in the target plane to the movable magnetic assembly, achieving the purpose of applying an in-plane bending moment to the object under test in a non-contact manner. Compared with the technical solution of using contact loading in the related art, the load loading device according to the embodiment of the present application can still provide accurate stress to the object under test in some complex environments (such as vibration, high temperature, etc.), ensuring that the test can be carried out normally and reliably. In addition, since there is no contact between the fixed magnetic assembly and the movable magnetic assembly of the load loading device according to the embodiment of the present application, there is no frictional loss between the two, which is beneficial to carrying out long-term loading tests. Description of the Drawings

[0029] Figure 1 The figure shows a schematic diagram of an object under test installed in the load loading device according to an embodiment of the present application.

[0030] Figure 2 The figure shows a schematic diagram of the fixed magnetic assembly and the movable magnetic assembly being spaced apart along a first direction.

[0031] Figure 3 The figure shows another schematic diagram of the fixed magnetic assembly and the movable magnetic assembly being spaced apart along the first direction.

[0032] Figure 4 The figure shows Figure 2 a schematic diagram with the fixed mounting portion and the movable mounting portion omitted.

[0033] Figure 5 is a cross-sectional view along the Figure 4 A-A cutting line in

[0034] Figure 6 The figure shows a schematic diagram in which the first to sixth movable permanent magnets are arc-shaped.

[0035] Figure 7 The figure shows a schematic diagram of the load loading device according to another embodiment of the present application, in which the mounting base, the fixed mounting portion, and the movable mounting portion are omitted.

[0036] Figure 8 is a cross-sectional view along the Figure 7 B-B cutting line in

[0037] Among them, the reference numerals are explained as follows:

[0038] 10, object to be measured; 11, first component; 12, second component;

[0039] 100, mounting base;

[0040] 200, fixed magnetic component; 210, first fixed magnetic member; 220, second fixed magnetic member; 230, fixed mounting portion;

[0041] 300, movable magnetic component; 310, first movable magnetic member; 311, first movable permanent magnet; 312, second movable permanent magnet; 313, fifth movable permanent magnet; 320, second movable magnetic member; 321, third movable permanent magnet; 322, fourth movable permanent magnet; 323, sixth movable permanent magnet; 330, third movable magnetic member; 340, fourth movable magnetic member; 350, fifth movable magnetic member; 360, sixth movable magnetic member; 370, seventh movable magnetic member; 380, movable mounting portion;

[0042] D1, first direction; D2, second direction; D3, third direction;

[0043] P, target plane; L, rotation axis; M, in-plane bending moment; F, axial force. Detailed implementation manners

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0045] It can be understood that the terms "include" and "have" and any variations thereof in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or components inherent to these processes, methods, products, or devices.

[0046] It should be noted that, in order to verify whether the service life of the object under test meets the relevant requirements, in the related art, a load loading device is usually used to simulate the stress condition that the object under test is subjected to under actual working conditions. However, when the load loading device in the related art loads the object under test, a mechanical contact method is adopted, which leads to a problem of poor contact between the load loading device and the object under test in some complex environments (such as vibration, high temperature, etc.). As a result, the load provided by the load loading device cannot be accurately transmitted to the object under test, affecting the normal progress of the test.

[0047] Based on this, the embodiment of the present application provides a load loading device. Through the non-contact design of the magnetic component, the problem that the test fails due to easy poor contact caused by the mechanical contact design is effectively solved.

[0048] As Figure 1 and Figure 2 shown, the load loading device of the embodiment of the present application is used to apply a load to the object under test 10. Among them, the object under test 10 has a first component 11 and a second component 12 that can rotate relative to each other. The load loading device of the embodiment of the present application includes a mounting base 100, a fixed magnetic component 200, and a movable magnetic component 300. The first component 11 is mounted on the mounting base 100.

[0049] The fixed magnetic component 200 is mounted on the mounting base 100 and is disposed opposite to the object under test 10 in the first direction D1; wherein, the first direction D1 is the extending direction of the rotation axis L of the first component 11 and the second component 12; the movable magnetic component 300 is mounted on the second component 12, and the movable magnetic component 300 and the fixed magnetic component 200 are arranged at intervals in the first direction D1 to generate a magnetic force, and the magnetic force is used to apply an in-plane bending moment M in the target plane P to the movable magnetic component 300, and the target plane P is perpendicular to the first direction D1.

[0050] As can be seen from the above, in the load loading device of the embodiment of the present application, the movable magnetic component 300 and the fixed magnetic component 200 are arranged at intervals in the first direction D1 to generate a magnetic force, and the magnetic force is used to apply an in-plane bending moment M in the target plane P to the movable magnetic component 300, achieving the purpose of applying the in-plane bending moment M to the object under test 10 in a non-contact manner. Compared with the technical solution of using contact loading in the related art, the load loading device of the embodiment of the present application can still provide accurate stress to the object under test 10 in some complex environments (such as vibration, high temperature, etc.), ensuring that the test can be carried out normally and reliably. In addition, since there is no contact between the fixed magnetic component 200 and the movable magnetic component 300 of the load loading device of the embodiment of the present application, there is no frictional loss between the two, which is beneficial to carrying out a long-term loading test.

[0051] As Figure 2As shown, the movable magnetic component 300 includes a first movable magnetic member 310 and a second movable magnetic member 320. The first movable magnetic member 310 and the second movable magnetic member 320 are spaced apart along the second direction D2 and symmetrically arranged along the rotation axis L. The second direction D2 is perpendicular to the first direction D1. A magnetic attraction force is formed between the first movable magnetic member 310 and the fixed magnetic component 200, and a magnetic repulsive force is formed between the second movable magnetic member 320 and the fixed magnetic component 200.

[0052] In the embodiment of the present application, the first movable magnetic member 310 and the second movable magnetic member 320 are spaced apart along the second direction D2 and symmetrically arranged along the rotation axis L. A magnetic attraction force is formed between the first movable magnetic member 310 and the fixed magnetic component 200, and a magnetic repulsive force is formed between the second movable magnetic member 320 and the fixed magnetic component 200, so that the movable magnetic component 300 has a tendency to make a flipping motion in the target plane P. Furthermore, the movable magnetic component 300 drives the second member 12 to make a flipping motion, so that the load loading device provides an in-plane bending moment M in the target plane P to the object under test 10.

[0053] Of course, it can be understood that in another embodiment, the first movable magnetic member 310 and the second movable magnetic member 320 can also be arranged as follows: spaced apart along the second direction D2 and asymmetrically arranged along the rotation axis L.

[0054] In still another embodiment, the movable magnetic component 300 may also include only one movable magnetic member, which is eccentrically arranged with respect to the rotation axis L and can generate a magnetic attraction force or a magnetic repulsive force with the fixed magnetic component 200.

[0055] It can be understood that the present application does not particularly limit the type of the object under test 10. The object under test 10 including the first member 11 and the second member 12 that can generate relative rotation is within the protection scope of the present application. For example, the object under test 10 can be a drone motor, a bearing, etc. When the object under test 10 is a drone motor, the first member 11 of the object under test 10 can be one of the stator and the rotor of the drone motor, and the second member 12 of the object under test 10 can be the other of the stator and the rotor of the drone motor. When the object under test 10 is a bearing, the first member 11 of the object under test 10 can be one of the outer ring and the inner ring of the bearing, and the second member 12 of the object under test 10 can be the other of the outer ring and the inner ring of the bearing.

[0056] For the convenience of description, next, the object under test 10 is taken as an example of a drone motor for description. Among them, the stator of the drone motor is installed on the mounting seat 100, and the rotor of the drone motor is installed on the movable magnetic component 300.

[0057] It should be noted that the present application embodiment does not particularly limit the specific shape of the mounting seat 100. Figure 1The shape shown should not be construed as a limitation on the mounting base 100. Regarding the shape of the mounting base 100, as long as it can satisfy the installation and fixation of the magnetic component 200 and the object to be measured 10. For example, in one embodiment, the rotation axis L of the first member 11 and the second member 12 can be vertically arranged. At this time, the mounting base 100 can include a top and a bottom, the top and the bottom are spaced apart in the first direction D1, the top can be provided with the fixed magnetic component 200, and the bottom can be provided with the object to be measured 10. In another embodiment, the rotation axis L of the first member 11 and the second member 12 can be horizontally arranged. At this time, the mounting base 100 can include two side portions, the two side portions are spaced apart in the first direction D1, one of the side portions can be provided with the fixed magnetic component 200, and the other side portion can be provided with the object to be measured 10.

[0058] As Figure 2 and Figure 3 As shown, the fixed magnetic component 200 includes a first fixed magnetic member 210 in an annular shape, and the axis of the first fixed magnetic member 210 is collinear with the rotation axis L; there is an overlapping first projection of the respective orthographic projections of the first fixed magnetic member 210 and the first movable magnetic member 310 on the target plane P, and the polarities of the mutually facing surfaces of the corresponding part of the first fixed magnetic member 210 and the corresponding part of the first movable magnetic member 310 are opposite; there is an overlapping second projection of the respective orthographic projections of the first fixed magnetic member 210 and the second movable magnetic member 320 on the target plane P, and the polarities of the mutually facing surfaces of the corresponding part of the first fixed magnetic member 210 and the corresponding part of the second movable magnetic member 320 are the same.

[0059] It should be noted that for the embodiment where the object to be measured 10 is a drone motor, when performing a loading test on the drone motor, the rotor of the drone motor needs to be in a constantly rotating state to simulate the actual stress condition of the drone motor when the drone is in flight.

[0060] It can be understood that since the first movable magnetic member 310 and the second movable magnetic member 320 are spaced apart in the second direction D2, when the second member 12 rotates relative to the first member 11, the second member 12 can drive the movable magnetic component 300 to rotate accordingly, and then the first movable magnetic member 310 and the second movable magnetic member 320 also rotate together with the second member 12. Then, at different times, there may be a circumferential component force of the magnetic attraction force between the first movable magnetic member 310 and the fixed magnetic component 200 along the rotor circumference, and there may be a circumferential component force of the magnetic repulsive force between the second movable magnetic member 320 and the fixed magnetic component 200 along the rotor circumference. Under the combined action of the two component forces, a torque is generated with the axis of the rotor of the drone motor as the axis, which affects the moment analysis of the load test.

[0061] In the embodiment of the present application, the first fixed magnetic member 210 is in a circular ring shape. Part of the first fixed magnetic member 210 corresponds to at least part of the first movable magnetic member 310 in the first direction D1, and part of the first fixed magnetic member 210 corresponds to at least part of the second movable magnetic member 320 in the first direction D1. When the first movable magnetic member 310 and the second movable magnetic member 320 rotate, they can always correspond to the circular-ring-shaped first fixed magnetic member 210, avoiding the generation of circumferential component forces along the rotor between the first movable magnetic member 310 and the first fixed magnetic member 210 and between the second movable magnetic member 320 and the first fixed magnetic member 210, thereby avoiding the adverse effect on the load test moment analysis caused by the generation of torque around the axis of the rotor of the drone motor.

[0062] As Figure 3 and Figure 4 shown, the fixed magnetic assembly 200 further includes a second fixed magnetic member 220. The first fixed magnetic member 210 surrounds the outer periphery of the second fixed magnetic member 220. The magnetization directions of the first fixed magnetic member 210 and the second fixed magnetic member 220 are opposite and parallel to the first direction D1.

[0063] The first movable magnetic member 310 includes a first movable permanent magnet 311 and a second movable permanent magnet 312 oppositely arranged along the second direction D2. There is an overlapping third projection of the first movable permanent magnet 311 and the first fixed magnetic member 210 on the target plane P. The magnetization direction of the part of the first fixed magnetic member 210 corresponding to the third projection is the same as that of the first movable permanent magnet 311; there is an overlapping fourth projection of the second movable permanent magnet 312 and the second fixed magnetic member 220 on the target plane P. The magnetization direction of the part of the second fixed magnetic member 220 corresponding to the fourth projection is the same as that of the second movable permanent magnet 312.

[0064] The second movable magnetic member 320 includes a third movable permanent magnet 321 and a fourth movable permanent magnet 322 oppositely arranged along the second direction D2. There is an overlapping fifth projection of the third movable permanent magnet 321 and the first fixed magnetic member 210 on the target plane P. The magnetization direction of the part of the first fixed magnetic member 210 corresponding to the fifth projection is opposite to that of the third movable permanent magnet 321; there is an overlapping sixth projection of the fourth movable permanent magnet 322 and the second fixed magnetic member 220 on the target plane P. The magnetization direction of the part of the second fixed magnetic member 220 corresponding to the sixth projection is opposite to that of the fourth movable permanent magnet 322.

[0065] Wherein, the present application does not particularly limit the shape of the second fixed magnetic member 220. For example, the second fixed magnetic member 220 can be in a strip shape, a circular ring shape, etc., as long as it can correspond to the second movable permanent magnet 312 and the fourth movable permanent magnet 322 in the first direction D1.

[0066] When the second fixed magnetic member 220 is in an annular shape, the axis of the second fixed magnetic member 220 is collinear with the rotation axis L. In other words, the first fixed magnetic member 210 and the second fixed magnetic member 220 are configured in a concentric ring structure. By designing the second fixed magnetic member 220 to be annular, when the second movable permanent magnet 312 and the fourth movable permanent magnet 322 rotate, they can always correspond to the annular second fixed magnetic member 220, avoiding the generation of a circumferential component force of the rotor between the second movable permanent magnet 312 and the second fixed magnetic member 220 and between the fourth movable permanent magnet 322 and the second fixed magnetic member 220, and further avoiding the adverse effect on the load test moment analysis caused by the generation of a torque about the axis of the rotor of the drone motor.

[0067] As Figure 5 shown, if Figure 5 the upward direction along the first direction D1 is defined as the positive direction and the downward direction along the first direction D1 is defined as the negative direction, then the magnetization directions of the first fixed magnetic member 210 and the second fixed magnetic member 220 can be: the magnetization direction of the first fixed magnetic member 210 (the direction indicated by the arrow in the figure) is the negative direction, and the magnetization direction of the second fixed magnetic member 220 (the direction indicated by the arrow in the figure) is the positive direction; it can also be that the magnetization direction of the first fixed magnetic member 210 is the positive direction and the magnetization direction of the second fixed magnetic member 220 is the negative direction.

[0068] In the embodiment of the present application, the magnetization direction of the first fixed magnetic member 210 is the negative direction, the polarity of the surface of the first fixed magnetic member 210 facing the movable magnetic assembly 300 is the N pole, and the polarity of the surface of the first fixed magnetic member 210 facing away from the movable magnetic assembly 300 is the S pole. The magnetization direction of the second fixed magnetic member 220 is the positive direction, the polarity of the surface of the second fixed magnetic member 220 facing away from the movable magnetic assembly 300 is the N pole, and the polarity of the surface of the second fixed magnetic member 220 facing the movable magnetic assembly 300 is the S pole.

[0069] Since the magnetization direction of the first movable permanent magnet 311 is the same as that of the first fixed magnetic member 210, the polarity of the surface of the first movable permanent magnet 311 facing the fixed magnetic assembly 200 is the S pole, and the polarity of the surface of the first movable permanent magnet 311 facing away from the fixed magnetic assembly 200 is the N pole. Since the magnetization direction of the second movable permanent magnet 312 is the same as that of the second fixed magnetic member 220, the polarity of the surface of the second movable permanent magnet 312 facing the fixed magnetic assembly 200 is the N pole, and the polarity of the surface of the second movable permanent magnet 312 facing away from the fixed magnetic assembly 200 is the S pole.

[0070] It can be seen that a magnetic attractive force is generated between the first fixed magnetic member 210 and the first movable permanent magnet 311, and a magnetic attractive force is also generated between the second fixed magnetic member 220 and the second movable permanent magnet 312. Therefore, a relatively large magnetic attractive force is formed between the first movable magnetic member 310 and the fixed magnetic assembly 200.

[0071] Since the magnetization direction of the third movable permanent magnet 321 is opposite to that of the first fixed magnetic member 210, the polarity of the surface of the third movable permanent magnet 321 facing the fixed magnetic assembly 200 is the N pole, and the polarity of the surface of the third movable permanent magnet 321 facing away from the fixed magnetic assembly 200 is the S pole. Since the magnetization direction of the fourth movable permanent magnet 322 is opposite to that of the second fixed magnetic member 220, the polarity of the surface of the fourth movable permanent magnet 322 facing the fixed magnetic assembly 200 is the S pole, and the polarity of the surface of the fourth movable permanent magnet 322 facing away from the fixed magnetic assembly 200 is the N pole.

[0072] It can be seen that a magnetic repulsive force is generated between the first fixed magnetic member 210 and the third movable permanent magnet 321, and a magnetic repulsive force is also generated between the second fixed magnetic member 220 and the fourth movable permanent magnet 322. Therefore, a relatively large magnetic repulsive force is formed between the second movable magnetic member 320 and the fixed magnetic assembly 200.

[0073] In summary, since both the magnetic attractive force between the first movable magnetic member 310 and the fixed magnetic assembly 200 and the magnetic repulsive force between the second movable magnetic member 320 and the fixed magnetic assembly 200 are increased, the in-plane bending moment M applied by the fixed magnetic assembly 200 to the movable magnetic assembly 300 is also increased, enabling the load loading device of the embodiment of the present application to adapt to the load test with a relatively large in-plane bending moment M.

[0074] Please continue to refer to Figure 4 and Figure 5 , among the first movable permanent magnet 311 and the second movable permanent magnet 312, the movable permanent magnet with the magnetization direction away from the fixed magnetic assembly 200 is defined as the first away permanent magnet, and the movable permanent magnet with the magnetization direction pointing to the fixed magnetic assembly 200 is defined as the first pointing permanent magnet. The first movable magnetic member 310 further includes a fifth movable permanent magnet 313, which is disposed between the first movable permanent magnet 311 and the second movable permanent magnet 312, and the magnetization direction of the fifth movable permanent magnet 313 is: from the first away permanent magnet to the first pointing permanent magnet.

[0075] In the embodiment of the present application, the first away permanent magnet is the first movable permanent magnet 311, the first pointing permanent magnet is the second movable permanent magnet 312, the magnetization direction of the fifth movable permanent magnet 313 is parallel to the second direction D2, and points from the first movable permanent magnet 311 to the second movable permanent magnet 312.

[0076] Since the magnetization direction of the fifth movable permanent magnet 313 points from the first movable permanent magnet 311 to the second movable permanent magnet 312, the polarity of the surface of the fifth movable permanent magnet 313 facing the second movable permanent magnet 312 is the N pole, and the polarity of the surface of the fifth movable permanent magnet 313 facing the first movable permanent magnet 311 is the S pole. By arranging the fifth movable permanent magnet 313, the magnetic field strength between the first movable magnetic member 310 and the fixed magnetic assembly 200 can be enhanced, thereby increasing the magnetic attraction force between the first movable magnetic member 310 and the fixed magnetic assembly 200.

[0077] As Figure 5 shown, specifically, in the region between the first movable magnetic member 310 and the fixed magnetic assembly 200, for the first movable permanent magnet 311 and the second movable permanent magnet 312, the magnetic induction lines of the second movable permanent magnet 312 point from the N pole of the second movable permanent magnet to the S pole of the first movable permanent magnet 311. For the fifth movable permanent magnet 313, the magnetic induction lines also point from the N pole of the fifth movable permanent magnet 313 to the S pole of the fifth movable permanent magnet 313. It can be seen that on the path where the magnetic induction lines of the fifth movable permanent magnet 313 point from the N pole to the S pole, they will pass through the N pole of the second movable permanent magnet 312 and the S pole of the first movable permanent magnet 311. Therefore, the arrangement of the fifth movable permanent magnet 313 can enhance the magnetic field strength between the first movable magnetic member 310 and the fixed magnetic assembly 200 and increase the magnetic attraction force.

[0078] Please continue to refer to Figure 4 and Figure 5 , in the third movable permanent magnet 321 and the fourth movable permanent magnet 322, the movable permanent magnet whose magnetization direction deviates from the fixed magnetic assembly 200 is defined as the second deviating permanent magnet, and the movable permanent magnet whose magnetization direction points to the fixed magnetic assembly 200 is defined as the second pointing permanent magnet; the second movable magnetic member 320 further includes a sixth movable permanent magnet 323, and the sixth movable permanent magnet 323 is arranged between the third movable permanent magnet 321 and the fourth movable permanent magnet 322. The magnetization direction of the sixth movable permanent magnet 323 is: from the second deviating permanent magnet to the second pointing permanent magnet.

[0079] In the embodiment of the present application, the second deviating permanent magnet is the fourth movable permanent magnet 322, the second pointing permanent magnet is the third movable permanent magnet 321, the magnetization direction of the sixth movable permanent magnet 323 is parallel to the second direction D2, and points from the fourth movable permanent magnet 322 to the third movable permanent magnet 321.

[0080] Since the magnetization direction of the sixth movable permanent magnet 323 points from the fourth movable permanent magnet 322 to the third movable permanent magnet 321, the polarity of the surface of the sixth movable permanent magnet 323 facing the third movable permanent magnet 321 is the N pole, and the polarity of the surface of the sixth movable permanent magnet 323 facing the fourth movable permanent magnet 322 is the S pole. By setting the sixth movable permanent magnet 323, the magnetic field strength between the second movable magnetic member 320 and the fixed magnetic assembly 200 can be strengthened, and thus the magnetic repulsive force between the second movable magnetic member 320 and the fixed magnetic assembly 200 can be increased.

[0081] As Figure 5 shown, specifically, in the region between the second movable magnetic member 320 and the fixed magnetic assembly 200, for the third movable permanent magnet 321 and the fourth movable permanent magnet 322, the magnetic induction lines of the third movable permanent magnet 321 point from the N pole of the third movable permanent magnet to the S pole of the fourth movable permanent magnet 322. For the sixth movable permanent magnet 323, the magnetic induction lines point from the N pole of the sixth movable permanent magnet 323 to the S pole of the sixth movable permanent magnet 323. Thus, it can be seen that on the path where the magnetic induction lines of the sixth movable permanent magnet 323 point from the N pole to the S pole, they will pass through the N pole of the third movable permanent magnet 321 and the S pole of the fourth movable permanent magnet 322. Therefore, the setting of the sixth movable permanent magnet 323 can strengthen the magnetic field strength between the second movable magnetic member 320 and the fixed magnetic assembly 200 and increase the magnetic repulsive force.

[0082] In summary, by setting the fifth movable permanent magnet 313 between the first movable permanent magnet 311 and the second movable permanent magnet 312, and setting the sixth movable permanent magnet 323 between the third movable permanent magnet 321 and the fourth movable permanent magnet 322, the magnetic field strength in the region between the fixed magnetic assembly 200 and the movable magnetic assembly 300 can be strengthened, and thus the magnetic attractive force between the first movable magnetic member 310 and the fixed magnetic assembly 200 and the magnetic repulsive force between the second movable magnetic member 320 and the fixed magnetic assembly 200 can be increased, ultimately achieving the purpose of increasing the in-plane bending moment M.

[0083] It can be understood that the magnetic members included in the fixed magnetic assembly 200 and the magnetic members included in the movable magnetic assembly 300 can be permanent magnets or electromagnets. For example, in one embodiment, the magnetic members included in the fixed magnetic assembly 200 and the magnetic members included in the movable magnetic assembly 300 are both permanent magnets; in another embodiment, the magnetic members included in the fixed magnetic assembly 200 and the magnetic members included in the movable magnetic assembly 300 are both electromagnets; in still another embodiment, one of the magnetic members included in the fixed magnetic assembly 200 and the magnetic members included in the movable magnetic assembly 300 is a permanent magnet and the other is an electromagnet.

[0084] Of course, the magnetic components included in the fixed magnetic assembly 200 or the movable magnetic assembly 300 may include a part of permanent magnets and another part of electromagnets. For example, one of the first fixed magnetic component 210 and the second fixed magnetic component 220 is a permanent magnet and the other is an electromagnet.

[0085] In the embodiment of the present application, the first fixed magnetic component 210 and the second fixed magnetic component 220 are both permanent magnets.

[0086] It is understandable that the embodiment of the present application does not specifically limit the shapes of the first movable permanent magnet 311, the second movable permanent magnet 312, the third movable permanent magnet 321, the fourth movable permanent magnet 322, the fifth movable permanent magnet 313 and the sixth movable permanent magnet 323. For example, the six movable permanent magnets may be block-shaped or arc-shaped.

[0087] In the embodiments of the present application, Figure 6 As shown, the shapes of the six movable permanent magnets are all arc-shaped that partially surround the rotation axis L, and the curvature of each arc-shaped is the same as the curvature of the first fixed magnetic component 210. By designing the shapes of the first movable permanent magnet 311, the second movable permanent magnet 312, the third movable permanent magnet 321, the fourth movable permanent magnet 322, the fifth movable permanent magnet 313 and the sixth movable permanent magnet 323 to be arc-shaped, the volume of each movable permanent magnet can be increased, thereby increasing the magnetic force between the fixed magnetic component 200, and finally achieving the purpose of increasing the in-plane bending moment M.

[0088] Please return to Figures 2 to 4 As shown, the movable magnetic component 300 also includes a third movable magnetic member 330 and a fourth movable magnetic member 340, and the third movable magnetic member 330 and the fourth movable magnetic member 340 are arranged at intervals along the third direction D3 and symmetrically along the rotation axis L; wherein the first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other; a first magnetic force is formed between the third movable magnetic member 330 and the fixed magnetic component 200, and a second magnetic force is formed between the fourth movable magnetic member 340 and the fixed magnetic component 200; both the first magnetic force and the second magnetic force are magnetic repulsion forces; or, both the first magnetic force and the second magnetic force are magnetic attraction forces.

[0089] In the embodiment of the present application, a first magnetic force is formed between the third movable magnetic component 330 and the first fixed magnetic component 210 , and a second magnetic force is formed between the fourth movable magnetic component 340 and the first fixed magnetic component 210 .

[0090] It can be understood that the movable magnetic component 300 is further provided with a third movable magnetic member 330 and a fourth movable magnetic member 340. The third movable magnetic member 330 and the fourth movable magnetic member 340 can form a magnetic repulsive force with the fixed magnetic component 200, or the third movable magnetic member 330 and the fourth movable magnetic member 340 can form a magnetic attractive force with the fixed magnetic component 200. Thus, in cooperation with the first movable magnetic member 310 and the second movable magnetic member 320 included in the movable magnetic component 300, the load loading device according to the embodiment of the present application can apply an axial force F (such as Figure 1 ) and an in-plane bending moment M to the object under test 10, so that the stress environment provided by the load loading device is more in line with the actual working condition environment of the object under test 10.

[0091] In the embodiment where the object under test 10 is a drone motor, the drone motor can be installed on the wing of the drone in a forward installation or a reverse installation. Forward installation means that the stator of the drone motor is installed on the side of the wing facing the sky, and reverse installation means that the stator of the drone motor is installed on the side of the wing facing the ground. When the drone motor is installed forward, the lift generated by the rotation of the propeller causes the rotor to tend to move away from the stator. When the drone motor is installed in reverse, the lift generated by the rotation of the propeller causes the rotor to tend to move closer to the stator.

[0092] In the embodiment of the present application, when the third movable magnetic member 330 and the fourth movable magnetic member 340 form a magnetic repulsive force with the fixed magnetic component 200, it can simulate the working condition of the drone motor installed in reverse; when the third movable magnetic member 330 and the fourth movable magnetic member 340 form a magnetic attractive force with the fixed magnetic component 200, it can simulate the working condition of the drone motor installed forward.

[0093] It can be understood that both the third movable magnetic member 330 and the fourth movable magnetic member 340 can be permanent magnets; or, both the third movable magnetic member 330 and the fourth movable magnetic member 340 are made of soft magnetic materials. Among them, the soft magnetic materials can include but are not limited to iron, cobalt, nickel, and their alloys, etc.

[0094] When both the third movable magnetic member 330 and the fourth movable magnetic member 340 are made of soft magnetic materials, the third movable magnetic member 330 and the fourth movable magnetic member 340 can be magnetized by the first fixed magnetic member 210, so that magnetic attractive forces are generated between the third movable magnetic member 330, the fourth movable magnetic member 340 and the first fixed magnetic member 210 respectively.

[0095] When both the third movable magnetic member 330 and the fourth movable magnetic member 340 are permanent magnets, there is a seventh projection where the respective orthographic projections of the third movable magnetic member 330 and the first fixed magnetic member 210 on the target plane P overlap. The polarities of the mutually facing surfaces of the third movable magnetic member 330 and the corresponding part of the first fixed magnetic member 210 of the seventh projection exhibit a first polarity relationship; there is an eighth projection where the respective orthographic projections of the fourth movable magnetic member 340 and the first fixed magnetic member 210 on the target plane P overlap. The polarities of the mutually facing surfaces of the fourth movable magnetic member 340 and the corresponding part of the first fixed magnetic member 210 of the eighth projection also exhibit a first polarity relationship; the first polarity relationship includes the same polarity or opposite polarities. Specifically, if the polarities of the mutually facing surfaces corresponding to the seventh projection are the same, then the polarities of the mutually facing surfaces corresponding to the eighth projection are also the same; if the polarities of the mutually facing surfaces corresponding to the seventh projection are opposite, then the polarities of the mutually facing surfaces corresponding to the eighth projection are also opposite. For example, the polarities of the surfaces of the third movable magnetic member 330 and the fourth movable magnetic member 340 facing the fixed magnetic assembly 200 can both be the N pole or both be the S pole.

[0096] In an embodiment, the shapes of both the third movable magnetic member 330 and the fourth movable magnetic member 340 are arc-shaped that partially surround the rotation axis L, and the radian of each arc is the same as that of the first fixed magnetic member 210. By designing the shapes of the third movable magnetic member 330 and the fourth movable magnetic member 340 as arc-shaped, the volumes of the third movable magnetic member 330 and the fourth movable magnetic member 340 can be increased, thereby increasing the magnetic force between them and the fixed magnetic assembly 200, achieving the purpose of increasing the axial force F.

[0097] Please refer back to Figure 2 and Figure 3 , the fixed magnetic assembly 200 further includes a fixed mounting portion 230, and the movable magnetic assembly 300 further includes a movable mounting portion 380. The fixed mounting portion 230 is connected to the mounting base 100, and the first fixed magnetic member 210 and the second fixed magnetic member 220 are mounted on the fixed mounting portion 230. The movable mounting portion 380 is connected to the second member 12, and the first movable permanent magnet 311, the second movable permanent magnet 312, the third movable permanent magnet 321, the fourth movable permanent magnet 322, the fifth movable permanent magnet 313, the sixth movable permanent magnet 323, the third movable magnetic member 330, and the fourth movable magnetic member 340 are mounted on the movable mounting portion 380.

[0098] Among them, one side surface of the first fixed magnetic member 210 facing the movable magnetic assembly 300 and one side surface of the second fixed magnetic member 220 facing the movable magnetic assembly 300 are both exposed on the outer surface of the fixed mounting portion 230. One side surfaces of the first movable permanent magnet 311, the second movable permanent magnet 312, the third movable permanent magnet 321, the fourth movable permanent magnet 322, the fifth movable permanent magnet 313, the sixth movable permanent magnet 323, the third movable magnetic member 330, and the fourth movable magnetic member 340 facing the fixed magnetic assembly 200 are all exposed on the outer surface of the movable mounting portion 380.

[0099] It can be understood that, in one embodiment, the first fixed magnetic member 210, the second fixed magnetic member 220, and the fixed mounting portion 230 can be connected by integral injection molding, and the first movable permanent magnet 311, the second movable permanent magnet 312, the third movable permanent magnet 321, the fourth movable permanent magnet 322, the fifth movable permanent magnet 313, the sixth movable permanent magnet 323, the third movable magnetic member 330, the fourth movable magnetic member 340, and the movable mounting portion 380 can be connected by integral injection molding.

[0100] Of course, in other embodiments, a plurality of grooves can also be formed in the fixed mounting portion 230 and the movable mounting portion 380, and the above-mentioned magnetic members are embedded into the corresponding grooves.

[0101] It can be understood that by adjusting the distance between the fixed magnetic assembly 200 and the movable magnetic assembly 300 in the first direction D1, the magnitudes of the in-plane bending moment M and the axial force F can be adjusted.

[0102] As Figure 7 and Figure 8 shown, on the other hand, the present application further provides a load loading device. The same parts as those of the load loading device in the above embodiment will not be described in detail. The differences are as follows:

[0103] The fixed magnetic assembly 200 includes a first fixed magnetic member 210 in a circular ring shape, and the axis of the first fixed magnetic member 210 is collinear with the rotation axis L; the movable magnetic assembly 300 includes a fifth movable magnetic member 350 in a circular ring shape, and the axis of the fifth movable magnetic member 350 is collinear with the rotation axis L; a magnetic repulsive force or a magnetic attractive force is formed between the first fixed magnetic member 210 and the fifth movable magnetic member 350.

[0104] In the embodiment of the present application, both the first fixed magnetic member 210 and the fifth movable magnetic member 350 are in a circular ring shape, and a magnetic repulsive force or a magnetic attractive force is formed between the two, so that the axial force F applied by the load loading device is more uniform along the circumferential direction of the rotation axis L, and the torque with the axis of the rotor as the axis can be avoided.

[0105] Please continue to refer to Figure 7 andFigure 8 The fixed magnetic assembly 200 further includes a second fixed magnetic member 220 in an annular shape, and the axis of the second fixed magnetic member 220 is collinear with the rotation axis L; the first fixed magnetic member 210 surrounds the outer periphery of the second fixed magnetic member 220; the magnetization directions of the first fixed magnetic member 210 and the second fixed magnetic member 220 are opposite and parallel to the first direction D1; the movable magnetic assembly 300 further includes a sixth movable magnetic member 360 in an annular shape, and the axis of the sixth movable magnetic member 360 is collinear with the rotation axis L; the magnetization directions of the sixth movable magnetic member 360 and the fifth movable magnetic member 350 are opposite. There is an overlapping ninth projection of the first fixed magnetic member 210 and the fifth movable magnetic member 350 on the target plane P respectively, and the magnetization direction of the first fixed magnetic member 210 corresponding to the ninth projection of the fifth movable magnetic member 350 is the same; there is an overlapping tenth projection of the second fixed magnetic member 220 and the sixth movable magnetic member 360 on the target plane P respectively, and the magnetization direction of the second fixed magnetic member 220 corresponding to the tenth projection of the sixth movable magnetic member 360 is the same.

[0106] In the embodiment of the present application, the first fixed magnetic member 210 and the second fixed magnetic member 220 are arranged in concentric rings with opposite magnetization directions; the fifth movable magnetic member 350 and the sixth movable magnetic member 360 are arranged in concentric rings with opposite magnetization directions, so that the magnetic field strength between the fixed magnetic assembly 200 and the movable magnetic assembly 300 is significantly enhanced, and thus the magnetic force between the fixed magnetic assembly 200 and the movable magnetic assembly 300 is increased, achieving the purpose of increasing the axial force F.

[0107] For example, as Figure 8 shown, the polarities of the surfaces of the first fixed magnetic member 210 and the fifth movable magnetic member 350 facing each other are both N poles, and the polarities of the surfaces of the second fixed magnetic member 220 and the sixth movable magnetic member 360 facing each other are both S poles. A magnetic repulsive force is formed between the first fixed magnetic member 210 and the fifth movable magnetic member 350, and a magnetic repulsive force is formed between the second fixed magnetic member 220 and the sixth movable magnetic member 360.

[0108] Certainly, in another embodiment, the polarities of the surfaces of the first fixed magnetic member 210 and the fifth movable magnetic member 350 facing each other are both S poles, and the polarities of the surfaces of the second fixed magnetic member 220 and the sixth movable magnetic member 360 facing each other are both N poles. In still another embodiment, the polarities of the surfaces of the first fixed magnetic member 210 and the fifth movable magnetic member 350 facing each other are opposite, and the polarities of the surfaces of the second fixed magnetic member 220 and the sixth movable magnetic member 360 facing each other are opposite, so as to form a magnetic attractive force between the fixed magnetic assembly 200 and the movable magnetic assembly 300.

[0109] Continue to refer to Figure 7 andFigure 8 The movable magnetic component 300 further includes a seventh movable magnetic member 370 in an annular shape. The axis of the seventh movable magnetic member 370 is collinear with the rotation axis L, and the seventh movable magnetic member 370 is disposed between the fifth movable magnetic member 350 and the sixth movable magnetic member 360.

[0110] Among the fifth movable magnetic member 350 and the sixth movable magnetic member 360, the movable magnetic member with the magnetization direction away from the fixed magnetic component 200 is defined as the away magnetic member, and the movable magnetic member with the magnetization direction pointing to the fixed magnetic component 200 is defined as the pointing magnetic member. The magnetization direction of the seventh movable magnetic member 370 is: from the away magnetic member along the radial direction of the seventh movable magnetic member 370 to the pointing magnetic member.

[0111] In the embodiment of the present application, as Figure 8 shown, the away magnetic member is the sixth movable magnetic member 360, and the pointing magnetic member is the fifth movable magnetic member 350. Therefore, the magnetization direction of the seventh movable magnetic member 370 is: from the sixth movable magnetic member 360 to the fifth movable magnetic member 350.

[0112] By arranging the seventh movable magnetic member 370, the magnetic field strength between the fixed magnetic component 200 and the movable magnetic component 300 can be strengthened, and further the axial force F can be increased. Specifically, as Figure 8 shown, in the region between the fixed magnetic component 200 and the movable magnetic component 300, for the fifth movable magnetic member 350 and the sixth movable magnetic member 360, the magnetic induction lines of the fifth movable magnetic member 350 point from the N pole of the fifth movable magnetic member 350 to the S pole of the sixth movable magnetic member 360. For the seventh movable magnetic member 370, its magnetic induction lines point from the N pole of the seventh movable magnetic member 370 to the S pole of the seventh movable magnetic member 370. It can be seen that on the path where the magnetic induction lines of the seventh movable magnetic member 370 point from the N pole to the S pole, they will pass through the N pole of the fifth movable magnetic member 350 and the S pole of the sixth movable magnetic member 360. Therefore, the seventh movable magnetic member 370 can strengthen the magnetic field strength between the fixed magnetic component 200 and the movable magnetic component 300, and further increase the axial force F between the fixed magnetic component 200 and the movable magnetic component 300.

[0113] It can be understood that the first fixed magnetic member 210, the second fixed magnetic member 220, the fifth movable magnetic member 350, the sixth movable magnetic member 360, and the seventh movable magnetic member 370 can be permanent magnets or electromagnets.

[0114] It can be understood that the various embodiments / implementation manners provided in the present application can be combined with each other without contradiction, and no further examples will be given here.

[0115] In the embodiments of the application, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plural" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to specific circumstances.

[0116] In the description of the embodiments of the application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the application.

[0117] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0118] The above are only the preferred embodiments of the embodiments of the application and are not used to limit the embodiments of the application. For those skilled in the art, the embodiments of the application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application shall be included in the protection scope of the embodiments of the application.

Claims

1. A load loading device for applying a load to a test object, where the test object has a first member and a second member capable of relative rotation; characterized in that, Comprising: A mounting base for mounting the first member; A fixed magnetic assembly mounted on the mounting base and oppositely arranged with the object to be measured in a first direction; wherein, the first direction is the extending direction of the rotation axis of the first member and the second member; And A movable magnetic assembly mounted on the second member; the movable magnetic assembly and the fixed magnetic assembly are arranged at intervals in the first direction to generate a magnetic force, and the magnetic force is used to apply an in-plane bending moment in a target plane to the movable magnetic assembly, and the target plane is perpendicular to the first direction.

2. The load loading device according to claim 1, wherein, The movable magnetic assembly includes a first movable magnetic member and a second movable magnetic member, the first movable magnetic member and the second movable magnetic member are arranged at intervals in a second direction and symmetrically arranged along the rotation axis, wherein, the second direction is perpendicular to the first direction, a magnetic attraction is formed between the first movable magnetic member and the fixed magnetic assembly, and a magnetic repulsion is formed between the second movable magnetic member and the fixed magnetic assembly.

3. The load loading device according to claim 2, wherein The fixed magnetic assembly includes a first fixed magnetic member in a circular ring shape, and the axis of the first fixed magnetic member is collinear with the rotation axis; There is an overlapping first projection of the respective positive projections of the first fixed magnetic member and the first movable magnetic member on the target plane, and the polarities of the mutually facing surfaces of the part of the first fixed magnetic member and the part of the first movable magnetic member corresponding to the first projection are opposite; There is an overlapping second projection of the respective positive projections of the first fixed magnetic member and the second movable magnetic member on the target plane, and the polarities of the mutually facing surfaces of the part of the first fixed magnetic member and the part of the second movable magnetic member corresponding to the second projection are the same.

4. The load loading device according to claim 3, wherein, The fixed magnetic assembly further includes a second fixed magnetic member, and the first fixed magnetic member surrounds the outer periphery of the second fixed magnetic member; the magnetization directions of the first fixed magnetic member and the second fixed magnetic member are opposite and parallel to the first direction; The first movable magnetic member includes a first movable permanent magnet and a second movable permanent magnet, there is an overlapping third projection of the respective positive projections of the first movable permanent magnet and the first fixed magnetic member on the target plane, and the magnetization direction of the part of the first fixed magnetic member corresponding to the third projection is the same as that of the first movable permanent magnet; There is an overlapping fourth projection of the respective positive projections of the second movable permanent magnet and the second fixed magnetic member on the target plane, and the magnetization direction of the part of the second fixed magnetic member corresponding to the fourth projection is the same as that of the second movable permanent magnet; The second movable magnetic member includes a third movable permanent magnet and a fourth movable permanent magnet. There is an overlapping fifth projection on the target plane between the positive projections of the third movable permanent magnet and the first fixed magnetic member, and the magnetization direction of the portion of the first fixed magnetic member corresponding to the fifth projection is opposite to that of the third movable permanent magnet. There is an overlapping sixth projection on the target plane between the positive projections of the fourth movable permanent magnet and the second fixed magnetic member, and the magnetization direction of the portion of the second fixed magnetic member corresponding to the sixth projection is opposite to that of the fourth movable permanent magnet.

5. The load loading device according to claim 4, characterized in that The first movable magnetic member further includes a fifth movable permanent magnet, which is disposed between the first movable permanent magnet and the second movable permanent magnet. The magnetization direction of the fifth movable permanent magnet is from a first departing permanent magnet to a first pointing permanent magnet. Herein, the first departing permanent magnet is the movable permanent magnet with a magnetization direction departing from the fixed magnetic assembly among the first movable permanent magnet and the second movable permanent magnet, and the first pointing permanent magnet is the movable permanent magnet with a magnetization direction pointing to the fixed magnetic assembly among the first movable permanent magnet and the second movable permanent magnet. The second movable magnetic member further includes a sixth movable permanent magnet, which is disposed between the third movable permanent magnet and the fourth movable permanent magnet. The magnetization direction of the sixth movable permanent magnet is from a second departing permanent magnet to a second pointing permanent magnet. Herein, the second departing permanent magnet is the movable permanent magnet with a magnetization direction departing from the fixed magnetic assembly among the third movable permanent magnet and the fourth movable permanent magnet, and the second pointing permanent magnet is the movable permanent magnet with a magnetization direction pointing to the fixed magnetic assembly among the third movable permanent magnet and the fourth movable permanent magnet.

6. The load loading device according to claim 4, wherein The second fixed magnetic member is circular ring-shaped, and the axis of the second fixed magnetic member is collinear with the rotation axis.

7. The load loading device according to claim 4, wherein, At least one of the first fixed magnetic member and the second fixed magnetic member is a permanent magnet.

8. The load loading device according to claim 1, wherein, The movable magnetic assembly further includes a third movable magnetic member and a fourth movable magnetic member. The third movable magnetic member and the fourth movable magnetic member are spaced apart along a third direction and symmetrically disposed along the rotation axis. Herein, the third direction is perpendicular to the first direction. A first magnetic force is formed between the third movable magnetic member and the fixed magnetic assembly, and a second magnetic force is formed between the fourth movable magnetic member and the fixed magnetic assembly. Both the first magnetic force and the second magnetic force are magnetic attractive forces, or both the first magnetic force and the second magnetic force are magnetic repulsive forces.

9. The load loading device according to claim 8, characterized in that, Both the third movable magnetic member and the fourth movable magnetic member are permanent magnets. There is an overlapping seventh projection on the target plane between the positive projections of the third movable magnetic member and the fixed magnetic assembly, and the polarities of the mutually facing surfaces of the portion of the fixed magnetic assembly corresponding to the seventh projection and the third movable magnetic member present a first polarity relationship. The positive projections of the fourth movable magnetic member and the fixed magnetic assembly on the target plane have an overlapping eighth projection, and the polarities of the mutually facing surfaces of the fourth movable magnetic member and a part of the fixed magnetic assembly corresponding to the eighth projection exhibit the first polarity relationship; Wherein, the first polarity relationship is that the polarities are the same or opposite.

10. The load loading device according to claim 8, characterized in that, Both the third movable magnetic member and the fourth movable magnetic member are made of soft magnetic materials.

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