Large-tonnage electromagnetic damping device with adjustable damping

Abstract

The utility model relates to a damping-adjustable large-tonnage electromagnetic damping device, and belongs to the technical field of vibration control. Comprising a shell, a motion conversion mechanism, a multi-stage speed change gear mechanism, a high-power direct-current motor and a rheostat. The shell comprises two groups of surface plates and side plates which are symmetrically arranged at intervals, and a connecting end plate and a restraining end plate are respectively arranged in the longitudinal direction; the motion conversion mechanism comprises a ball screw, a ball nut, a first-stage speed change gear thrust roller bearing and two symmetrically-arranged constraint steel plates. The two ends of the ball screw are provided with a guide shaft and a motion shaft respectively. The multi-stage speed change gear mechanism comprises two second-stage speed change gear sets arranged at intervals, two third-stage speed change gear sets symmetrically arranged in the longitudinal direction and a transverse steel plate for fixing the third-stage speed change gear sets. A high-power direct-current motor is arranged in the shell, and the high-power direct-current motor and a rheostat arranged outside are connected through a wire to form a series closed loop. According to the utility model, the displacement and acceleration response of the structure can be effectively controlled.

Description

Technical Field

[0001] The utility model relates to a damping device, in particular to a large-tonnage electromagnetic damping device with adjustable damping, belonging to the technical field of vibration control. Background Technique

[0002] A viscous damper is a device that dissipates energy using viscous fluid and is widely used in building engineering, bridge engineering, and other structures that require seismic design. Its origin can be traced back to the mid-20th century. Initially, viscous dampers were mainly used in the aerospace field to reduce the vibration of aircraft and improve their stability. With the development of technology and the deepening of the understanding of earthquake disasters, engineers began to realize the potential of viscous dampers in civil engineering.

[0003] The viscous damper can convert mechanical energy into heat energy through the viscous characteristics of the fluid, effectively dissipating seismic energy, especially performing outstandingly in small-amplitude and high-frequency earthquakes, thus significantly reducing the dynamic response of building structures in disasters such as earthquakes and wind vibrations; secondly, the viscous damper does not depend on the deformation or displacement of the structure, so it can provide a stable damping force in most cases and will not cause residual deformation of the structure; in addition, the viscous damper can be applied to various types of structures, including high-rise buildings, bridges, towers, etc., and can be used in both new construction and reinforcement projects.

[0004] Although the viscous damper performs well in practical applications, there are still some practical problems. The performance of the viscous damper is affected by temperature changes and is highly sensitive to temperature. Under high-temperature conditions, the viscosity of the damping liquid may decrease, reducing the damping effect; under low-temperature conditions, the liquid viscosity may increase, resulting in excessive damping force. Secondly, the viscous damper depends on the sealing of the fluid and the integrity of the container. Problems such as fluid leakage and seal aging may occur during long-term use, not only affecting the damping effect but also having a high maintenance cost. Additionally, to ensure the effectiveness of the viscous damper, especially for larger-tonnage dampers, due to the huge internal pressure in the cavity, usually higher requirements for sealing performance are put forward, further increasing the design difficulty and complexity.

[0005] In fact, the traditional viscous damper essentially belongs to a velocity-type damper, and its damping force is usually positively correlated with the velocity and independent of displacement. With the development of technology, other materials or mechanisms can also achieve this property. Such as electromagnetic damping, which can use the rotation of the motor rotor to generate an induced current and simultaneously be subjected to the reverse Ampere force of the magnetic field. The reverse Ampere force can provide the required damping force, and the Ampere force is positively correlated with the current magnitude, and the current magnitude is related to the motor speed and resistance. Therefore, electromagnetic damping can achieve the damping characteristics related to velocity, and the damping magnitude can be further adjusted by adjusting the resistance in the closed loop.

[0006] Furthermore, to adapt to a wider range of usage scenarios and the demand for higher stability and durability, it has become possible to seek a shock-absorbing device with an alternative viscous hysteretic model, and adjustable damping will also provide a more convenient solution for application scenarios with different requirements and conditions.

[0007] Therefore, there is an urgent need to propose a large-tonnage electromagnetic damping device with adjustable damping to solve the problems existing in the prior art. Summary of the Utility Model

[0008] In view of the above-mentioned defects existing in the prior art, the present utility model proposes a large-tonnage electromagnetic damping device with adjustable damping to solve the characteristics of traditional viscous dampers such as easy working fluid leakage and difficult maintenance.

[0009] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0010] A large-tonnage electromagnetic damping device with adjustable damping includes a motion conversion mechanism, a multi-stage speed-changing gear mechanism, a high-power DC motor arranged inside a housing, and a rheostat outside the housing;

[0011] The motion conversion mechanism includes a set of meshing ball screw and ball nut. Guide shafts and motion shafts are respectively arranged at both ends of the ball screw. The ball nut is fixedly embedded inside a first-stage speed-changing gear through high-strength bolts and is on the same working axis. Thrust roller bearings coaxial with each other are respectively arranged on both sides of the ball nut and the first-stage speed-changing gear. Two constraint steel plates are symmetrically arranged on both sides of the thrust roller bearings and maintain a fixed relationship;

[0012] The multi-stage speed-changing gear mechanism includes two groups of second-stage speed-changing gear groups arranged at intervals, two groups of third-stage speed-changing gear groups symmetrically arranged in the longitudinal direction, and a transverse steel plate for fixing the third-stage speed-changing gear groups. The second-stage speed-changing gear group includes a transmission shaft and two spur gears with different pitch diameters coaxial thereon. The third-stage speed-changing gear group includes a thin-walled linear flange bearing and two spur gears with different pitch diameters coaxial thereon;

[0013] A plurality of high-power DC motors are symmetrically arranged inside the housing. Rheostats are respectively arranged outside the high-power DC motors. A series closed loop is formed by connecting the high-power DC motors and the rheostats through wires; The high-power DC motors are connected to the transverse steel plate and a motor gear is arranged at one end of the rotor;

[0014] Both ends of the first-stage speed-changing gear are meshed with the small pitch diameter spur gears in the second-stage speed-changing gear group; The large pitch diameter spur gears in the second-stage speed-changing gear group are meshed with the small pitch diameter spur gears in the third-stage speed-changing gear group; The motor gear is meshed with the large pitch diameter spur gear in the third-stage speed-changing gear group.

[0015] Further, the housing includes two sets of symmetrically spaced flat plates and side plates. A connecting end plate and a restraining end plate are respectively provided in the longitudinal direction of the housing, and a linear flange bearing is provided at the center position of the restraining end plate.

[0016] Further, the edges of the flat plates and the side plates are aligned and fixedly connected by high-strength bolts. The connecting end plate and the restraining end plate are fixedly connected to the flat plates and the side plates by high-strength bolts.

[0017] Further, the guide shaft and the moving shaft are on the same working axis.

[0018] Further, one end of the thrust roller bearing is fixedly embedded in the counterbore of the restraining steel plate; the restraining steel plates are arranged in parallel at intervals to ensure that the ball nut does not move axially, and the counterbores of the restraining steel plates are collinear with the central axis in the longitudinal direction of the housing.

[0019] Further, the secondary speed-changing gear set is symmetrically arranged with respect to the axis of the primary speed-changing gear, and the tertiary speed-changing gear set is symmetrically arranged with respect to the central symmetry plane of the primary speed-changing gear.

[0020] Further, the rotation bearing hole positions of the transverse steel plate and the hole positions of the thin-walled linear flange bearing are on the same horizontal plane; the counterbore at the center of the restraining steel plate and the hole positions of the rotation bearing are on the same horizontal plane.

[0021] Further, the transmission shaft in the secondary speed-changing gear set and the two spur gears with different pitch diameters are on the same axis. The transmission shaft passes through the restraining steel plate and both ends are placed in the transverse steel plates. The transverse steel plates and the restraining steel plates are connected to the transmission shaft by embedding rotation bearings; the thin-walled linear flange bearing in the tertiary speed-changing gear set and the two spur gears with different pitch diameters remain on the same axis. The thin-walled linear flange bearing respectively passes through the transverse steel plates and is connected by high-strength bolts, passes through the large-pitch-diameter spur gear in the tertiary speed-changing gear set and is connected by a rotation bearing.

[0022] Further, the small-pitch-diameter spur gear in the secondary speed-changing gear set is connected to the transmission shaft by a flat key, and the large-pitch-diameter spur gear in the secondary speed-changing gear set is connected to the transmission shaft by a flat key; the end of the high-power DC motor rotor is connected to the motor gear by a flat key.

[0023] Further, four of the high-power DC motors are respectively arranged at intervals in the longitudinal and transverse directions of the housing.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] The utility model provides a large-tonnage electromagnetic damping device with adjustable damping, which comprises a housing, a motion conversion mechanism, a multi-stage speed-changing gear mechanism, a high-power DC motor, and a rheostat. The damping device has the following advantages:

[0026] 1. The motion conversion mechanism of this type of damping device adopts the cooperation form of a ball screw and a ball nut, which can convert linear motion into rotational motion, and has a significant displacement magnification ratio and high precision.

[0027] 2. The ball screw drives the ball nut and further drives the multi-stage gear to drive the motor gear. Even the slow axial movement of the ball screw can multiply the rotational speed of the motor rotor. In this process, the rotor cuts the magnetic induction line to generate an induced current, but at the same time, it is also subjected to an Ampere force opposite to the direction of motion to generate a damping force (load). The damping force is positively correlated with the motion rate, thus realizing the viscous damping characteristic. Further, the electromagnetic damping makes up for the defects of traditional viscous damping devices, such as easy working fluid leakage and difficult maintenance.

[0028] 3. The multi-stage gear speed-changing mechanism of this type of damping device can not only multiply the motor speed but also multiply the motor load resistance. At the same time, in cooperation with a high-power DC motor, it can further achieve a large-tonnage damping force at a relatively low cost, with a high conversion efficiency. Therefore, this type of damping device has high economic value and engineering practical value.

[0029] 4. The multi-stage speed-changing gear mechanism and the motor of this type of damping device are symmetrically arranged, which can significantly improve the force balance of each component and effectively enhance the reliability and stability of the damping device.

[0030] 5. The damping force (load) of the DC motor is positively correlated with the magnitude of the current in the circuit. Among them, the current is positively correlated with the motor speed and inversely proportional to the resistance magnitude in the closed circuit. Therefore, the magnitude of the damping force can be adjusted by setting the resistance value in the rheostat regulator circuit to meet the engineering requirements of different tonnages. The adjustable damping characteristic also provides solutions for multi-scenario applications, active control, and intelligent control and other fields. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. It should be understood that the specific shapes and structures shown in the drawings generally should not be regarded as limiting conditions when implementing the present application. For example, those skilled in the art are capable of making routine adjustments or further optimizations to the addition / removal / attribution division of certain units (components), specific shapes, positional relationships, connection methods, dimensional ratio relationships, etc. based on the technical concepts disclosed in the present application and the exemplary drawings.

[0032] Figure 1 It is a three-dimensional structure schematic diagram (hiding one side panel) of a large-tonnage electromagnetic damping device with adjustable damping from one perspective;

[0033] Figure 2 It is a three-dimensional structure schematic diagram of a large-tonnage electromagnetic damping device with adjustable damping from another perspective;

[0034] Figure 3 It is an exploded view of the motion conversion mechanism in a large-tonnage electromagnetic damping device with adjustable damping;

[0035] Figure 4 It is a schematic diagram of a multi-stage speed-changing gear mechanism in a large-tonnage electromagnetic damping device with adjustable damping;

[0036] Figure 5 It is a schematic diagram of the structure of the assembly of the second-stage speed-changing gear set and the first-stage speed-changing gear in a large-tonnage electromagnetic damping device with adjustable damping;

[0037] Figure 6 It is a schematic diagram of the structure of the assembly of a high-power DC motor, a motor gear, and a rheostat in a large-tonnage electromagnetic damping device with adjustable damping;

[0038] Figure 7 It is a schematic diagram of the structure of the assembly of the third-stage speed-changing gear set, a high-power DC motor, a transverse steel plate, and a motor gear in a large-tonnage electromagnetic damping device with adjustable damping. Detailed implementation manners

[0039] In the description of the present application: Unless otherwise specified, "a plurality" means two or more. The terms "first", "second", "third", etc. in the present application are intended to distinguish the objects being referred to, and do not have special meanings in terms of technical connotations (for example, it should not be understood as emphasizing the importance level or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0040] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this application are usually for the convenience of intuitive understanding with reference to the attached drawings, rather than absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as falling within the scope of the expression of this application.

[0041] The following will further elaborate on the present utility model in conjunction with the attached Figures 1-7 drawings and specific embodiments for a clear understanding of the present utility model, but they do not constitute limitations on the present utility model.

[0042] Embodiment 1

[0043] As Figures 1-2 shown, an adjustable damping large-tonnage electromagnetic damping device in this embodiment includes a housing, a motion conversion mechanism arranged inside the housing, a multi-stage speed-changing gear mechanism, a high-power DC motor 22, and a rheostat 23 arranged outside the housing.

[0044] In this embodiment, as Figure 2 shown, the housing includes two groups of symmetrically spaced flat plates 1 and side plates 2. A connecting end plate 3 and a restraining end plate 4 are respectively arranged in the longitudinal direction of the housing. A single-ear plate 5 and a stiffening plate 6 are welded on one side of the connecting end plate 3. A linear flange bearing 7 is arranged at the central position of the restraining end plate 4;

[0045] In this embodiment, as Figure 3 shown, the motion conversion mechanism includes a set of meshing ball screw 8 and ball nut 9. Guide shafts 10 and motion shafts 11 are respectively arranged at both ends of the ball screw 8. The ball nut 9 is fixedly embedded inside the first-stage speed-changing gear 12 through high-strength bolts and is on the same working axis. Thrust roller bearings 13 coaxial with both sides of the ball nut 9 are respectively arranged, and two restraining steel plates 14 are symmetrically arranged on both sides of the thrust roller bearing 13 and maintain a fixed relationship;

[0046] In this embodiment, as Figure 4 shown, the multi-stage speed-changing gear mechanism includes two groups of second-stage speed-changing gear sets arranged at intervals, and two groups of third-stage speed-changing gear sets symmetrically arranged in the longitudinal direction and a transverse steel plate 15 for fixing the third-stage speed-changing gear sets. The second-stage speed-changing gear set includes a coaxial transmission shaft 16 and two spur gears with different pitch diameters: a small pitch diameter gear 17 and a large pitch diameter gear 18. The third-stage speed-changing gear set includes a coaxial thin-walled linear flange bearing 19 and two spur gears with different pitch diameters: a small pitch diameter gear 20 and a large pitch diameter gear 21;

[0047] In this embodiment, as Figure 1As shown, four groups of high-power DC motors 22 are symmetrically arranged inside the housing. Variable resistors 23 are respectively arranged outside the high-power DC motors. A series closed loop is formed by connecting the high-power DC motors and the variable resistors through wires. The high-power DC motors are connected to the transverse steel plate, and a motor gear 24 is arranged at one end of the rotor.

[0048] As Figure 2 shown, the two groups of flat plates 1 and the side plates 2 are symmetrically arranged and spaced apart. The edges of the flat plates 1 and the side plates 2 are aligned and fixed by high-strength bolts. A connecting end plate 3 and a restraining end plate 4 are respectively arranged in the longitudinal direction of the housing and fixed by high-strength bolts.

[0049] A single-ear plate 5 and a stiffening plate 6 are welded on one side of the connecting end plate 3. A linear flange bearing 7 is arranged at the center position of the restraining end plate 4. The single-ear plate 5, the linear flange bearing 7 and the center axis of the housing in the longitudinal direction are collinear and in the same working plane.

[0050] As Figure 3 shown, the ball screw 8 and the ball nut 9 are meshed with each other. Guide shafts 10 and a moving shaft 11 are respectively arranged at both ends of the ball screw and are on the same working axis. A first-stage speed-changing gear 12 is arranged on one side of the ball nut 9 and is on the same working axis and fixedly connected by high-strength bolts.

[0051] Thrust roller bearings 13 are respectively arranged on both sides of the ball nut 9 and the first-stage speed-changing gear 12. One end of the thrust roller bearing 13 is embedded in the counterbore of the restraining steel plate 14. The restraining steel plates 14 are arranged at intervals in parallel to ensure that the ball nut 9 does not move axially. The counterbores of the restraining steel plates 14 are collinear with the center axis of the housing in the longitudinal direction.

[0052] As Figure 4 shown, the second-stage speed-changing gear set is symmetrically arranged with respect to the axis of the first-stage speed-changing gear, and the third-stage speed-changing gear set is symmetrically arranged with respect to the central symmetry plane of the first-stage speed-changing gear.

[0053] The rotational bearing hole positions of the transverse steel plate 15 and the holes of the thin-walled linear flange bearing 19 are in the same horizontal plane; the central counterbore of the restraining steel plate 14 and the hole positions of the rotational bearing 25 are in the same horizontal plane.

[0054] The transmission shaft 16 in the secondary speed change gear set and the two spur gears with different pitch diameters: the small pitch diameter gear 17 and the large pitch diameter gear 18 are on the same axis. The transmission shaft 16 passes through the constraint steel plate 14 and its two ends are placed in the transverse steel plate 15. The transverse steel plate 15 is connected to the constraint steel plate 14 through the embedded rotary bearing 25 and the transmission shaft 16. The thin-walled linear flange bearing 19 in the tertiary speed change gear and the two spur gears with different pitch diameters: the small pitch diameter gear 20 and the large pitch diameter gear 21 are kept on the same axis. The thin-walled linear flange bearing 19 passes through the transverse steel plate 15 respectively and is connected by high-strength bolts, passes through the large pitch diameter gear 21 in the tertiary speed change gear and is connected by the rotary bearing 25.

[0055] As Figures 4-5 shown, the small pitch diameter gear 17 in the secondary speed change gear set is connected to the transmission shaft 16 through the flat key 26 and meshes with the primary speed change gear 12. The large pitch diameter gear 18 in the secondary speed change gear set is connected to the transmission shaft 16 through the flat key 26 and meshes with the small pitch diameter gear 20 in the tertiary speed change gear set.

[0056] As Figure 1 shown, four of the high-power DC motors 22 are respectively arranged at intervals along the longitudinal and transverse directions of the housing, and a rheostat 23 is respectively arranged outside the high-power DC motors 22 and forms a series circuit through the guiding connection.

[0057] As Figure 7 shown, the high-power DC motor 22 is fixed to the transverse steel plate 15 through high-strength bolts. The end of the rotor of the high-power DC motor 22 is connected to the motor gear 24 through the flat key 26, and the motor gear 24 meshes with the large pitch diameter gear 21 in the tertiary speed change gear set.

[0058] Embodiment 2

[0059] A large-tonnage electromagnetic damping device with adjustable damping provided by the present application can be directly applied to the base isolation or energy dissipation damping building structure. When the structure is under the action of lateral load, it can fully dissipate energy to achieve the purpose of controlling the dynamic response of the structure.

[0060] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. These embodiments not explicitly written out should also be regarded as the scope recorded in this specification.

[0061] The above are only the preferred embodiments of the present utility model, and do not impose any formal restrictions on the structure of the present utility model. The layout form and the number of uses of the present utility model are not limited to this example either, and can be optimized according to the actual engineering situation. Any modification, equivalent change and decoration made to the above embodiments based on the technical principle of the present utility model without departing from the technical solution of the present utility model are still within the scope of the technical solution of the present utility model.

Claims

1. A large-tonnage electromagnetic damping device with adjustable damping, characterized in that: It comprises a motion conversion mechanism, a multi-stage speed change gear mechanism, a high-power DC motor (22) and a variable resistor (23) outside the housing; The motion conversion mechanism comprises a group of mutually meshing ball screws (8) and ball nuts (9), the two ends of the ball screw (8) are respectively provided with a guide shaft (10) and a motion shaft (11), the ball nut (9) is embedded in the first-stage speed change gear (12) by means of high-strength bolts and is located on the same working axis, the ball nut (9) and the first-stage speed change gear (12) are respectively provided with coaxial thrust roller bearings (13) on both sides, and two restraining steel plates (14) are symmetrically provided on both sides of the thrust roller bearing (13) and maintain an embedded relationship; The multi-stage speed change gear mechanism comprises two sets of two-stage speed change gear sets arranged at intervals, two sets of three-stage speed change gear sets arranged symmetrically in the longitudinal direction, and a transverse steel plate (15) for fixing the three-stage speed change gear sets, the two-stage speed change gear set comprises a transmission shaft (16) and two coaxial spur gears with different pitch circles thereon, and the three-stage speed change gear set comprises a thin-walled linear flange bearing (19) and two coaxial spur gears with different pitch circles thereon; A plurality of high-power DC motors (22) are symmetrically arranged inside the housing, and rheostats (23) are respectively arranged outside the high-power DC motors. The high-power DC motors (22) and the rheostats (23) are connected to each other via wires to form a series closed loop. The high-power DC motors (22) are connected to the transverse steel plate (15) and a motor gear (24) is arranged at one end of the rotor. The two ends of the first-stage speed change gear (12) mesh with the small-pitch circular spur gear in the second-stage speed change gear set; the large-pitch circular spur gear in the second-stage speed change gear set meshes with the small-pitch circular spur gear in the third-stage speed change gear set; and the motor gear (24) meshes with the large-pitch circular spur gear in the third-stage speed change gear set.

2. A large-tonnage electromagnetic damping device with adjustable damping according to claim 1, characterized in that: The housing comprises two groups of plane plates (1) and side plates (2) which are symmetrically spaced apart, and a connecting end plate (3) and a restraining end plate (4) are respectively provided in the longitudinal direction of the housing, and the restraining end plate (4) is provided with a linear flange bearing (7) at a central position.

3. A large-tonnage electromagnetic damping device with adjustable damping according to claim 2, characterized in that: The edges of the plane plate (1) and the side plate (2) are aligned and fixed via high-strength bolts, and the connecting end plate (3) and the restraining end plate (4) are fixed to the plane plate (1) and the side plate (2) via high-strength bolts.

4. The large-tonnage electromagnetic damping device with adjustable damping according to claim 1, characterized in that: The guide shaft (10) and the motion shaft (11) are located on the same working axis.

5. The large-tonnage electromagnetic damping device with adjustable damping according to claim 1, characterized in that: One end of the thrust roller bearing (13) is embedded in the countersunk hole of the restraining steel plate (14); the restraining steel plates (14) are arranged in parallel at intervals and ensure that the ball nut (9) does not move axially, and the countersunk hole of the restraining steel plate (14) is colinear with the central axis of the housing in the longitudinal direction.

6. The large-tonnage electromagnetic damping device with adjustable damping according to claim 1, characterized in that: The secondary speed change gear set is symmetrically arranged relative to the axis of the primary speed change gear (12), and the tertiary speed change gear set is symmetrically arranged relative to the central symmetry plane of the primary speed change gear (12).

7. A large-tonnage electromagnetic damping device with adjustable damping according to claim 6, characterized in that: The rotating bearing hole of the transverse steel plate (15) and the hole of the thin-walled linear flange bearing (19) are located at the same horizontal plane; the countersunk hole at the center of the restraining steel plate (14) and the hole of the rotating bearing (25) are located at the same horizontal plane.

8. The large-tonnage electromagnetic damping device with adjustable damping according to claim 6, characterized in that: The transmission shaft (16) and the two spur gears with different pitch circles in the two-stage speed change gear set are on the same axis, the transmission shaft (16) passes through the restraining steel plate (14) and the two ends are placed in the transverse steel plate (15), the transverse steel plate (15) and the restraining steel plate (14) are connected to the transmission shaft (16) by embedding a rotating bearing (25); the thin-walled linear flange bearing (19) and the two spur gears with different pitch circles in the three-stage speed change gear set are kept on the same axis, the thin-walled linear flange bearing (19) passes through the transverse steel plate (15) and is connected by high-strength bolts, passes through the large pitch circle spur gear in the three-stage speed change gear set and is connected by the rotating bearing (25).

9. A large-tonnage electromagnetic damping device with adjustable damping according to claim 8, characterized in that: The small-pitch circular spur gear in the two-stage speed change gear set is connected to the transmission shaft (16) via a flat key (26), and the large-pitch circular spur gear in the two-stage speed change gear set is connected to the transmission shaft (16) via a flat key (26); the end of the rotor of the high-power DC motor (22) is connected to the motor gear (24) via a flat key (26).

10. A large-tonnage electromagnetic damping device with adjustable damping according to claim 9, characterized in that: Four high-power DC motors (22) are arranged at intervals along the longitudinal and transverse directions of the housing.

Images