An electromagnetic loading device for simulating the force condition of a propeller

Abstract

The present invention relates to the technical field of reliability testing of motor shaft systems, and discloses an electromagnetic loading device for simulating the force conditions of a propeller, which includes a propeller driving device fixed on a support plate. The output shaft of the propeller driving device is fixedly connected to a magnetic disk through a transfer shaft. Along the direction away from the support plate, a radial electromagnetic loading mechanism and an axial electromagnetic loading mechanism are sequentially arranged inside the support plate. A torque electromagnetic loading mechanism is arranged inside the radial loading mechanism and includes a stator and a rotor, and the stator is connected in series with a load. A controllable power supply module is electrically connected to the radial electromagnetic loading mechanism and the axial electromagnetic loading mechanism respectively. The stationary stator and the rotor rotating with the magnetic disk together form a permanent magnet motor device. The invention can accurately simulate the axial force, overturning force, radial force, vibration, impact and other alternating loads transmitted by the propeller to the bearing, as well as the torque generated on the output shaft of the propeller driving device when the propeller rotates, occupies a small space, has a simple structure, and a low manufacturing cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of reliability testing of motor shaft systems, and particularly relates to an electromagnetic loading device for simulating the force conditions of a propeller. Background Art

[0002] The existing aviation and marine propeller motors mainly use the axial force generated after driving the propeller to rotate as a power source. As Figure 1 shown, the force conditions when the propeller rotates include the following points: 1) the tangential force overcome when rotating against the fluid resistance, which is converted into the torque on the output shaft of the propeller drive device; 2) the axial force (thrust / pull) acting on the propeller after rotation; 3) the overturning force generated due to the uneven radial distribution of the axial fluid velocity; 4) the radial force generated by the self-gravity of the propeller; 5) the radial force generated by the dynamic imbalance of the propeller and fluid turbulence; 6) the alternating loads such as alternating forces, vibrations, and impacts generated by the constantly changing fluid flow state.

[0003] All kinds of forces acting on the propeller are transmitted to the propeller drive device through the propeller, output shaft, bearing, housing, and fixed bracket. Among them, the reliability of the bearing is the key factor affecting the reliability of the propeller drive device. In order to test the reliability of the propeller drive device and the bearing, it is necessary to consider the influence of the actual force conditions of the propeller on the bearing during the test run, so as to verify whether the design of the propeller drive device and the bearing selection are reasonable.

[0004] Considering the complexity of fluid flow, the propeller is simultaneously subjected to multiple forces in different directions and of uncertain magnitudes when rotating. The traditional method of simulating the propeller load is to simulate the axial force and apply it to the output shaft of the propeller drive device. At present, the loading methods for axial force include mechanical loading and electromagnetic loading. The structure of the axial force mechanical loading device is relatively complex, the device occupies a large space, and the control method is not flexible. The axial force electromagnetic loading device greatly simplifies the structure of the device by using the electromagnetic principle and reduces the occupied space; the magnetic force generated by the electromagnet is a field force, and the object under force does not need to contact the electromagnet. The magnetic field strength is proportional to the current passing through, and it is easy to control the magnitude of the magnetic force. The load applied to the shaft system by the electromagnetic force can truly simulate the force and motion states of the shaft system.

[0005] CN 110146299 A discloses "an electromagnetic axial force loading device", which includes a connecting shaft. The left end of the connecting shaft is provided with a spline, the middle right part is provided with a boss, and the right end is provided with a flange; the central hole of an iron disk is matched with the middle part of the connecting shaft, and an insulating washer is provided at the matching part of the two; the right side surface of the iron disk is in corresponding contact with the left side surface of the boss, and an insulating washer is provided at the corresponding contact part of the two; a nut is in threaded connection with the middle part of the connecting shaft, the right side surface of the nut is in corresponding contact with the left side surface of the iron disk, and an insulating washer is provided at the corresponding contact part of the two; a plurality of electromagnet brackets are arranged equidistantly on a circumference of the iron disk, each electromagnet bracket is provided with an electromagnet component, and all are perpendicular to the left side surface of the iron disk. This loading device can accurately adjust the axial loading force to ensure that the shaft end of the dynamometer is not affected by the axial force, but does not consider the radial loading force on the propeller and the torque effect of the propeller on the output shaft of the propeller drive device. Its electromagnet brackets are prone to deformation under the action of large suction force, and the torque of the test comes from an external dynamometer, and the entire test system is too large to complete the simulation test in the environmental test chamber. Summary of the Invention

[0006] The purpose of the present invention is to provide an electromagnetic loading device for simulating the force conditions of a propeller. This electromagnetic loading device can accurately simulate the axial force, overturning force, radial force, and alternating loads such as vibration and impact transmitted by the propeller to the bearing, as well as the torque generated on the output shaft of the propeller drive device when the propeller rotates. It occupies a small space, has a simple structure, and a low manufacturing cost.

[0007] The above object of the invention is achieved by the following technical solutions:

[0008] An electromagnetic loading device for simulating the force conditions of a propeller, including a support plate, a transfer shaft, a magnetic disk, a propeller drive device, a radial electromagnetic loading mechanism, an axial electromagnetic loading mechanism, a torque electromagnetic loading mechanism, and a controllable power supply module;

[0009] The propeller drive device is fixedly connected to the outside of the support plate, the output shaft of the propeller drive device is fixedly connected to the magnetic disk through the transfer shaft, the output shaft of the propeller drive device, the transfer shaft, and the magnetic disk are coaxial, and the radial electromagnetic loading mechanism and the axial electromagnetic loading mechanism are sequentially arranged on the inner side of the support plate along the direction away from the support plate;

[0010] The radial electromagnetic loading mechanism includes an annular mounting frame and radial electromagnets. The magnetic disk is nested inside the mounting frame. The mounting frame is coaxial with the magnetic disk. The radial electromagnets are distributed along the circumference of the mounting frame, and the end of the mounting frame is connected to the support plate;

[0011] The axial electromagnetic loading mechanism comprises a cover plate and an axial electromagnet, wherein the cover plate is located at the other end of the mounting frame and is opposite to the magnetic disc, and the axial electromagnet is arranged on a side surface of the cover plate facing the magnetic disc, and the cover plate is connected to the mounting frame;

[0012] The torque electromagnetic loading mechanism comprises a stator and a rotor, wherein the stator comprises a stator core, a stator winding and a load, wherein the stator core is fixed on the inner circumference of the mounting frame, the stator winding is wound on the stator core, and the stator winding is connected in series with the load; the rotor comprises a rotor core and a rotor magnet, wherein the rotor core is fixedly mounted on the outer circumference of the magnetic disc and arranged opposite to the stator core, and the rotor magnet is fixed on the rotor core; the magnetic field generated by the current in the stator winding interacts with the magnetic field of the rotor magnet to generate a torque that hinders the rotation of the magnetic disc;

[0013] The controllable power supply module includes a controller, a DC power supply and a signal generator. The controller is electrically connected to the DC power supply and the signal generator respectively. The controller is also electrically connected to the coil winding of the radial electromagnet and the coil winding of the axial electromagnet respectively.

[0014] The electromagnetic loading device for simulating propeller stress conditions as mentioned above, wherein the number of the axial electromagnets is 2 to 5, and the axial electromagnets include a central electromagnet arranged along the axial direction of the magnetic disk and side electromagnets distributed in the circumferential direction of the central electromagnet.

[0015] The electromagnetic loading device for simulating the force condition of a propeller mentioned above, wherein the number of radial electromagnets is 1 to 2, the radial electromagnets are arranged on the inner side of the mounting frame, and the radial electromagnets are arranged along the vertical diameter direction of the mounting frame.

[0016] The above-mentioned electromagnetic loading device for simulating the force condition of a propeller, wherein the cross-section of the magnetic disc is U-shaped, and the magnetic disc comprises a disc body and a support ring extending from the periphery of the disc body, the support ring is perpendicular to the disc body, and the center of the disc body is fixedly connected to one end of the adapter shaft.

[0017] The electromagnetic loading device for simulating propeller stress conditions is characterized in that the end faces of the plurality of axial electromagnets on one side of the magnetic disc are flush with and parallel to the disc body, and a gap of 1 to 2 mm is provided between the end faces of the axial electromagnets and the disc body.

[0018] The above-mentioned electromagnetic loading device for simulating the force condition of a propeller, wherein the radial electromagnet is located on the vertical plane where the disc body is located, and the side of the radial electromagnet close to the disc body is an arc surface concentric with the disc body, and a gap of 1 to 2 mm is provided between the arc surface of the radial electromagnet and the outer circle of the disc body.

[0019] In the above-mentioned electromagnetic loading device for simulating the force condition of a propeller, a positioning stop is provided on one side of the center of the disc body close to the adapter shaft, and the adapter shaft is provided with an installation stop that matches the positioning stop.

[0020] The above-mentioned electromagnetic loading device for simulating the stress condition of a propeller, wherein the rotor core is annular and is sleeved on the outer periphery of a support ring, a plurality of rotor magnets are evenly distributed on the outer periphery of the rotor core, the stator core and the rotor magnet are located on the same vertical plane perpendicular to the axis of the transfer shaft, the inner side of the stator core and the outer side of the rotor magnet are both provided with arc surfaces concentric with the transfer shaft, and a gap of 0.5 to 1 mm is provided between the arc surface of the stator core and the arc surface of the rotor magnet.

[0021] In the above-mentioned electromagnetic loading device for simulating the force condition of a propeller, the support plate, the mounting frame and the cover plate are all made of non-magnetic materials.

[0022] In the above-mentioned electromagnetic loading device for simulating the force condition of a propeller, the support plate, the mounting frame and the cover plate are all provided with through holes.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention adopts a radial electromagnetic loading mechanism, an axial electromagnetic loading mechanism and a controllable power supply module, which can realize synchronous simulation of alternating loads such as alternating force, vibration and impact that the propeller is subjected to during operation, and verify whether the design of the propeller drive device and the selection of bearings are reasonable and reliable; the torque loading mechanism is adopted to connect the load externally, which can simulate the propeller load torque that the output shaft of the propeller drive device is subjected to, and the torque condition of the propeller can be simulated without an external dynamometer.

[0025] The present invention can synchronously simulate the axial force, overturning force and radial force exerted on the propeller by selecting the installation quantity and position of the axial electromagnet and the radial electromagnet.

[0026] The invention adopts a closed integrated structure with small volume, compact structure, strong system rigidity, small deformation, precise and flexible electromagnetic force control, and can be placed in an environmental test chamber for simulation tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of propeller force analysis;

[0028] Figure 2 It is a schematic diagram of the structure of the present invention;

[0029] Figure 3 It is a structural schematic diagram of another perspective of the present invention;

[0030] Figure 4 It is an exploded view of the present invention;

[0031] Figure 5 It is a schematic cross-sectional view of the present invention;

[0032] Figure 6 It is a block diagram of the working principle of a radial electromagnet, a central electromagnet and a side electromagnet of the present invention.

[0033] Reference numerals: 1, support plate; 2, transfer shaft; 3, magnetic disk; 31, disk body; 32, support ring; 33, positioning stop; 4, propeller drive device; 5, radial electromagnetic loading mechanism; 51, mounting frame; 52, radial electromagnet; 6, axial electromagnetic loading mechanism; 61, cover plate; 62, axial electromagnet; 621, central electromagnet; 622, side electromagnet; 7, torque electromagnetic loading mechanism; 71, stator; 711, stator core; 712, stator winding; 72, rotor; 721, rotor core; 722, rotor magnet; 73, load; 8, controllable power supply module; 81, controller; 811, first controller; 812, second controller; 813, third controller; 82, DC power supply; 83, signal generator; 831, first signal generator; 832, second signal generator; 833, third signal generator; 9, through hole. Detailed implementation manners

[0034] The following further describes the present invention in detail in conjunction with the attached Figure 2-6 drawings.

[0035] As Figure 2-4 shown, an electromagnetic loading device for simulating the force condition of a propeller includes a support plate 1, a transfer shaft 2, a magnetic disk 3, a propeller drive device 4, a radial electromagnetic loading mechanism 5, an axial electromagnetic loading mechanism 6, a torque electromagnetic loading mechanism 7 and a controllable power supply module 8.

[0036] As Figure 4 , 5 shown, the support plate 1 is circular, the propeller drive device 4 is fixedly connected to the outside of the support plate 1 by screws, and the output shaft of the propeller drive device 4 is fixedly connected to the magnetic disk 3 through the transfer shaft 2. Specifically, one end of the output shaft of the propeller drive device 4 is fixedly connected to the transfer shaft 2, and the other end of the transfer shaft 2 is fixedly connected to the magnetic disk 3. The output shaft of the propeller drive device 4, the transfer shaft 2 and the magnetic disk 3 are coaxially arranged. The propeller drive device 4 is used to drive the magnetic disk 3 to rotate. Specifically, the propeller drive device 4 adopts a motor or an engine, and the rotation of the output shaft of the motor or the engine can drive the magnetic disk 3 to rotate synchronously; a radial electromagnetic loading mechanism 5 and an axial electromagnetic loading mechanism 6 are sequentially arranged on the inner side of the support plate 1 along the direction away from the support plate 1; the axial electromagnetic loading mechanism 6 and the radial electromagnetic loading mechanism 5 act on the axial direction and the radial direction of the magnetic disk 3 respectively. By using the magnetic disk 3 to simulate the propeller, the axial and radial force conditions of the propeller can be simulated.

[0037] The radial electromagnetic loading mechanism 5 includes an annular mounting frame 51 and radial electromagnets 52. The magnetic disc 3 is nested inside the mounting frame 51. The mounting frame 51 is coaxial with the magnetic disc 3. The radial electromagnets 52 are distributed along the circumference of the mounting frame 51. One end of the mounting frame 51 is connected to the support plate 1. Specifically, the mounting frame 51 and the support plate 1 are detachably connected by screws.

[0038] The axial electromagnetic loading mechanism 6 includes a cover plate 61 and an axial electromagnet 62. The cover plate 61 is circular. The cover plate 61 is located at the other end of the mounting frame 51 and is opposite to the magnetic disc 3. The cover plate 61 and the magnetic disc 3 are parallel to each other. The axial electromagnet 62 is arranged on a side surface of the cover plate 61 facing the magnetic disc 3. The cover plate 61 is connected to the mounting frame 51. Specifically, the cover plate 61 and the mounting frame 51 are detachably connected by screws.

[0039] The support plate 1, the radial electromagnetic loading mechanism 5, and the axial electromagnetic loading mechanism 6 form a closed integrated structure, which improves the rigidity of the electromagnetic loading device.

[0040] The magnetic disc 3 of this embodiment has a U-shaped cross section. The magnetic disc 3 includes a disc body 31 and a support ring 32 extending from the periphery of the disc body 31 . The support ring 32 is perpendicular to the disc body 31 . The center of the disc body 31 is fixedly connected to one end of the adapter shaft 2 .

[0041] The torque electromagnetic loading mechanism 7 includes a stator 71 and a rotor 72. The stator 71 includes a stator core 711, a stator winding 712 and a load 73. The stator core 711 is fixed to the inner circumference of the mounting frame 51. The stator winding 712 is wound on the stator core 711. Specifically, a plurality of slots are provided at intervals along the circumference of the inner wall of the stator core 711. The stator winding 712 is wound on the stator core 711 through the slots. The stator winding 712 is connected in series with the load 73. The rotor 72 includes a rotor core 721 and a rotor magnetic steel 722. The sub-iron core 721 is fixedly installed on the outer circumference of the magnetic disk 3 and is arranged opposite to the stator core 711. The stator core 711 and the rotor magnet 722 are located on the same vertical plane perpendicular to the axis of the transfer shaft 2, and the rotor magnet 722 is fixed on the rotor core 721; specifically, the outer wall of the rotor core 721 is provided with a plurality of slots at intervals along the circumference, and the rotor magnet 722 is fixed in the slots; the magnetic field generated by the current in the stator winding 712 interacts with the magnetic field of the rotor magnet 722 to generate a torque that hinders the rotation of the magnetic disk 3.

[0042] It should be noted that a gap is provided between the radial electromagnet 52 and the rotor core 721 along the axial direction of the magnetic disk 3 to avoid mutual interference between the radial electromagnetic loading mechanism 5 and the torque electromagnetic loading mechanism 7 .

[0043] like Figure 6As shown in the figure, the controllable power supply module 8 includes a controller 81, a DC power supply 82, and a signal generator 83. The controller 81 is electrically connected to the DC power supply 82 and the signal generator 83 respectively. The controller 81 is also electrically connected to the coil windings of the radial electromagnet 52 and the axial electromagnet 62 respectively. A stator 71 mounted on the mounting bracket 51 and a rotor 72 mounted on the magnetic disk 3 form a permanent magnet motor device.

[0044] The axial electromagnet 62 and the radial electromagnet 52 are powered by the controllable power supply module 8. Combining different control strategies, the controller 81 can control the axial electromagnet 62 and the radial electromagnet 52 to generate alternating suction forces with different frequencies and amplitudes, simulating the axial force, radial force, vibration, impact and other alternating loads received during the rotation of the propeller. The magnetic disk 3 is equivalent to the propeller and is used to simulate the force condition of the propeller. The magnetic disk 3 is the acting object of the axial electromagnet 62 and the radial electromagnet 52. The electromagnetic suction force acting on the magnetic disk 3 is controlled by the installation quantity, installation position and control strategy of the axial electromagnet 62 and the radial electromagnet 52, so as to simulate the axial and radial force conditions of the propeller.

[0045] During the process that the propeller drive device 4 drives the magnetic disk 3 to rotate and synchronously drives the rotor 72 to rotate, a current will be generated in the loop composed of the stator winding 712 and the load 73. The magnetic field generated by the current flowing through the stator winding 712 interacts with the magnetic field of the rotor permanent magnet 722, generating a torque that hinders the rotation of the rotor 72, that is, the torque that hinders the rotation of the magnetic disk 3. The magnitude of the torque can be adjusted by adjusting the load 73, so as to simulate the torque acting on the output shaft of the propeller drive device 4 when the propeller rotates.

[0046] There are 2 to 5 axial electromagnets 62. The axial electromagnet 62 includes a central electromagnet 621 arranged along the axis direction of the magnetic disk 3 and side electromagnets 622 distributed circumferentially around the central electromagnet 621. When there are more than two side electromagnets 622, the distances between the side electromagnets 622 and the central electromagnet 621 can be the same or different.

[0047] The central electromagnet 621 can generate an axial force on the magnetic disk 3 to simulate the axial force received by the propeller; the side electromagnets 622 can generate an overturning force on the magnetic disk 3 to simulate the overturning force received by the propeller; the radial electromagnet 52 is located directly above or below the magnetic disk 3, and the resultant force of the suction force generated by it and the self-weight of the magnetic disk 3 is used to simulate the radial force received by the propeller.

[0048] The end faces of multiple axial electromagnets 62 on the side close to the magnetic disk 3 are flush and parallel to the magnetic disk 3. There is a gap of 1 to 2 mm between the end face of the axial electromagnet 62 and the disk body 31.

[0049] The radial electromagnet 52 is located on the vertical plane where the disc body 31 is located. The side of the radial electromagnet 52 close to the disc body 31 is an arc surface concentric with the disc body 31. There is a gap of 1-2 mm between the arc surface of the radial electromagnet 52 and the outer circle of the disc body 31.

[0050] There are 1-2 radial electromagnets 52. The radial electromagnets 52 are arranged inside the mounting frame 51 and are arranged along the vertical diameter direction of the mounting frame 51. When there is 1 radial electromagnet 52, it can be arranged at the top or bottom of the vertical diameter direction of the mounting frame 51; when there are 2 radial electromagnets 52, they can be arranged at the top and bottom of the vertical diameter direction of the mounting frame 51. When there are two radial electromagnets 52, the distances of the two radial magnets 52 from the center of the mounting frame 51 are the same.

[0051] Figure 6 The working principle block diagram is shown when there is one radial electromagnet 52 in the electromagnetic loading device, one central electromagnet 621 in the axial electromagnet 62, and one side electromagnet 622. The signal generator 83 includes a first signal generator 831, a second signal generator 832, and a third signal generator 833. The controller 81 includes a first controller 811, a second controller 812, and a third controller 813.

[0052] The first signal generator 831, the first controller 811, and the central electromagnet 621 are electrically connected in sequence. The electrical signal generated by the first signal generator 831 is controlled and adjusted by the first controller 811 and sent to the coil winding of the central electromagnet 621. The magnetic field generated by the central electromagnet 621 acts on the disc body 31 along the axial direction to simulate the axial force received by the propeller.

[0053] The second signal generator 832, the second controller 812, and the side electromagnet 622 are electrically connected in sequence. The electrical signal generated by the second signal generator 832 is controlled and adjusted by the second controller 812 and sent to the coil winding of the side electromagnet 622. The magnetic field generated by the side electromagnet 622 acts on the disc body 31 along the axial direction to simulate the overturning force received by the propeller.

[0054] The third signal generator 833, the third controller 813, and the radial electromagnet 52 are electrically connected in sequence; the electrical signal generated by the third signal generator 833 is controlled and adjusted by the third controller 813 and sent to the coil winding of the radial electromagnet 52. The magnetic field generated by the radial electromagnet 52 acts on the disc body 31 in the radial direction of the disc body 31 to simulate the radial force received by the propeller.

[0055] In this embodiment, the support plate 1, the mounting bracket 51, and the cover plate 61 are all made of non-magnetic materials. For example, copper or aluminum alloy can be used. Since the support plate 1, the mounting bracket 51, and the cover plate 61 are all made of non-magnetic materials, magnetic interference of the above components on the axial electromagnetic loading mechanism 6, the radial electromagnetic loading mechanism 5, and the torque electromagnetic loading mechanism 7 can be avoided.

[0056] As Figure 4 shown, in this embodiment, the output shaft of the propeller drive device 4 is connected to the adapter shaft 2 through a keyway structure. Specifically, a keyway can be provided along the axial direction in the inner cavity of the adapter shaft 2, and a key adapted to the keyway is provided on the output shaft of the propeller drive device 4 to ensure that the output shaft of the propeller drive device 4 can rotate synchronously with the adapter shaft 2; the adapter shaft 2 and the output shaft of the propeller drive device 4 are fixedly connected in the axial direction by screws. A positioning stop 33 is provided on one side of the center of the disc body 31 close to the adapter shaft 2, and the adapter shaft 2 is provided with a mounting stop adapted to the positioning stop 33, and the disc body 31 and the adapter shaft 2 can be fixedly connected by screws. Through the cooperation of the mounting stop and the positioning stop 33, the coaxiality of the adapter shaft 2 and the magnetic disc 3, as well as the accuracy and convenience of installation, can be ensured.

[0057] The rotor iron core 721 is annular and sleeved on the outer periphery of the support ring 32. The rotor iron core 721 can rotate synchronously with the support ring 32. A plurality of rotor magnets 722 are evenly distributed on the outer periphery of the rotor iron core 721. The stator iron core 711 and the rotor magnets 722 are located on the same vertical plane perpendicular to the axis of the adapter shaft 2. Arc surfaces concentric with the adapter shaft 2 are provided on the inner side of the stator iron core 711 and the outer side of the rotor magnets 722. A gap of 0.5 - 1 mm is provided between the arc surface of the stator iron core 711 and the arc surface of the rotor magnets 722.

[0058] In one embodiment, through holes 9 are provided on the support plate 1, the mounting bracket 51, and the cover plate 61.

[0059] The through holes 9 on the cover plate 61 are evenly distributed along the circumferential direction of the cover plate 61, the through holes 9 on the mounting bracket 51 are evenly distributed along the circumferential direction of the mounting bracket 51, and the through holes 9 on the support plate 1 are evenly distributed along the circumferential direction of the support plate 1.

[0060] The through holes 9 can be waist-shaped holes, circular holes, or oval holes. The through holes 9 can be used to reduce the weight of the electromagnetic loading device, and at the same time, it is also convenient to observe the cooperation and operation conditions inside the electromagnetic loading device.

[0061] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An electromagnetic loading device for simulating the force condition of a propeller, characterized in that It includes a strut, a transfer shaft, a magnetic disk, a propeller drive device, a radial electromagnetic loading mechanism, an axial electromagnetic loading mechanism, a torque electromagnetic loading mechanism, and a controllable power supply module; The propeller drive device is fixedly connected to the outside of the strut. The output shaft of the propeller drive device is fixedly connected to the magnetic disk through the transfer shaft. The output shaft of the propeller drive device, the transfer shaft, and the magnetic disk are coaxial. The radial electromagnetic loading mechanism and the axial electromagnetic loading mechanism are sequentially arranged on the inner side of the strut along the direction away from the strut; The radial electromagnetic loading mechanism includes an annular mounting frame and radial electromagnets. The magnetic disk is nested inside the mounting frame. The mounting frame is coaxial with the magnetic disk. The radial electromagnets are distributed along the circumference of the mounting frame. The end of the mounting frame is connected to the strut; The axial electromagnetic loading mechanism includes a cover plate and axial electromagnets. The cover plate is located at the other end of the mounting frame and is opposite to the magnetic disk. The axial electromagnets are arranged on one side of the cover plate facing the magnetic disk. The cover plate is connected to the mounting frame; The torque electromagnetic loading mechanism includes a stator and a rotor. The stator includes a stator core, a stator winding, and a load. The stator core is fixed on the inner circumference of the mounting frame. The stator winding is wound around the stator core. The stator winding is connected in series with the load; The rotor includes a rotor core and rotor permanent magnets. The rotor core is fixedly installed on the outer circumference of the magnetic disk and is arranged opposite to the stator core. The rotor permanent magnets are fixed on the rotor core; The magnetic field generated by the current in the stator winding interacts with the magnetic field of the rotor permanent magnets to generate a torque that hinders the rotation of the magnetic disk; The controllable power supply module includes a controller, a DC power supply, and a signal generator. The controller is electrically connected to the DC power supply and the signal generator respectively. The controller is also electrically connected to the coil windings of the radial electromagnets and the axial electromagnets respectively.

2. The electromagnetic loading device for simulating the force on a propeller according to claim 1, wherein There are 2 to 5 axial electromagnets. The axial electromagnets include a central electromagnet arranged along the axis direction of the magnetic disk and side electromagnets distributed circumferentially around the central electromagnet.

3. The electromagnetic loading device for simulating the force on a propeller according to claim 1, characterized in that, There are 1 to 2 radial electromagnets. The radial electromagnets are arranged inside the mounting frame. The radial electromagnets are arranged along the vertical diameter direction of the mounting frame.

4. The electromagnetic loading device for simulating the force on a propeller according to claim 1, wherein The cross-section of the magnetic disk is U-shaped. The magnetic disk includes a disk body and a support ring extending from the outer circumference of the disk body. The support ring is perpendicular to the disk body. The center of the disk body is fixedly connected to one end of the transfer shaft.

5. The electromagnetic loading device for simulating the force condition of a propeller according to claim 4, characterized in that The end faces of the multiple axial electromagnets on the side close to the magnetic disk are flush and parallel to the disk body. There is a gap of 1 to 2 mm between the end face of the axial electromagnet and the disk body.

6. The electromagnetic loading device for simulating the force condition of a propeller according to claim 4, characterized in that The radial electromagnet is located on the vertical plane where the disk body is located. The side of the radial electromagnet close to the disk body is an arc surface concentric with the disk body. There is a gap of 1 to 2 mm between the arc surface of the radial electromagnet and the outer circle of the disk body.

7. The electromagnetic loading device for simulating the force condition of a propeller according to claim 4, wherein A positioning stop is provided on one side of the center of the disk body close to the transfer shaft. The transfer shaft is provided with a mounting stop adapted to the positioning stop.

8. The electromagnetic loading device for simulating the force on a propeller according to claim 4, wherein The rotor core is annular and sleeved on the outer periphery of the support ring. A plurality of the rotor magnets are evenly distributed on the outer periphery of the rotor core. The stator core and the rotor magnets are located on the same vertical plane perpendicular to the axis of the transfer shaft. Arc surfaces concentric with the transfer shaft are provided on the inner side of the stator core and the outer side of the rotor magnets. A gap of 0.5 to 1 mm is provided between the arc surface of the stator core and the arc surface of the rotor magnets.

9. The electromagnetic loading device for simulating the force condition of a propeller according to claim 1, characterized in that, The support plate, the mounting bracket, and the cover plate are all made of non-magnetic materials.

10. The electromagnetic loading device for simulating the force on a propeller according to claim 1, characterized in that, Through holes are provided on the support plate, the mounting bracket, and the cover plate.

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