Electric drive system and cable-controlled underwater equipment

Abstract

The present invention discloses an electric drive system, including a shore control center, a power supply and multi-channel interface unit, a main control device, a power supply unit and a thruster, wherein the main control device is connected to an external special device downstream; the shore control center includes an insulation monitoring module, a shore transformer unit, a shore computer and a switch unit; the power supply unit includes a sealed tank body, wherein a transformer, a rectifier and a capacitor module connected in sequence along the current direction are arranged in the sealed tank body, a central axis is coaxially arranged in the sealed tank body, and the transformer, rectifier and capacitor module are coaxially mounted on the central axis in sequence, and the sealed tank body is filled with transformer oil. The structure of the electric drive system is relatively compact and regular, and the assembly space required is small, which can make the overall volume of the cable remote control underwater equipment more compact and reduce the operating resistance of the cable remote control underwater equipment accordingly. The present invention also discloses a cable remote control underwater equipment using the above-mentioned electric drive system.

Description

Technical Field

[0001] The present invention relates to the technical field of remote control underwater equipment supporting components, and in particular to an electric drive system. The present invention also relates to a cable-controlled remote control underwater equipment using the electric drive system. Background Art

[0002] With the increasing attention and in-depth study of ocean exploration in relevant industries in recent years, there are more and more remote-controlled underwater equipment such as robots used for underwater detection and related operations, such as cable-controlled underwater robots (ROVs) and cable-free underwater robots (AUVs). Such underwater detection robots have played an irreplaceable role in marine oil development, salvaging underwater targets, and underwater exploration operations.

[0003] Most of the existing cable-controlled remote-controlled underwater equipment uses a hydraulic power system as the driving system of the entire equipment. Due to the complex structure of the hydraulic power system itself and the large assembly space required, the overall size of the cable-controlled remote-controlled underwater equipment is large, and the underwater operation resistance is large, resulting in a corresponding increase in the overall energy consumption of the equipment and a short endurance time for a single operation, which has an adverse impact on related underwater operations.

[0004] Therefore, how to make the structural layout of the electric drive system more regular and rational to reduce the assembly space required, while reducing the overall weight of the cable-controlled underwater equipment and reducing the operating resistance accordingly is an important technical problem that technical personnel in this field currently need to solve. Summary of the Invention

[0005] An object of the present invention is to provide an electric drive system with a relatively regular and rational structural layout and a small assembly space, thereby reducing the overall weight and operating resistance of a cable-controlled underwater device. Another object of the present invention is to provide a cable-controlled underwater device utilizing the above-mentioned electric drive system.

[0006] To solve the above technical problems, the present invention provides an electric drive system, comprising a shore control center, a power supply and multi-channel interface unit, a main control device, a power supply unit, and a thruster. The shore control center is communicatively connected to the main control device and the power supply unit via the power supply and multi-channel interface unit, respectively. The shore control center and the power supply and multi-channel interface unit, as well as the power supply and multi-channel interface unit and the power supply unit, are electrically connected via an umbilical cable. Several external dedicated devices are connected downstream of the main control device, and the power supply unit supplies power to the main control device, the thruster, and the external dedicated devices.

[0007] The shore control center includes an insulation monitoring module, a shore transformer unit capable of converting low-frequency, low-voltage AC power into high-frequency, high-voltage AC power, a shore computer capable of controlling the operation of the external dedicated equipment, and a switch unit connected to the shore computer and ensuring network interaction. The insulation monitoring module cooperates with the power-connected components of the electric drive system and is connected to the shore computer through the switch unit.

[0008] The power supply unit includes a sealed tank body, and the inner cavity of the sealed tank body is provided with a transformer, a rectifier and a capacitor module which are sequentially connected to the downstream of the power supply and multi-channel interface unit along the current direction. A central axis is coaxially arranged in the inner cavity of the sealed tank body, and the transformer, the rectifier and the capacitor module are coaxially mounted on the central axis in sequence. The inner cavity of the sealed tank body is filled with transformer oil.

[0009] Preferably, a buffer resistor connected in parallel with the external dedicated equipment is also provided in the inner cavity of the sealed tank body, the buffer resistor is connected downstream of the capacitor module, and an insulating plate coaxially mounted on the central axis is provided between the buffer resistor and the capacitor module.

[0010] Preferably, a limit plate located downstream of the insulating plate is coaxially mounted on the central axis, the buffer resistor is arranged between the insulating plate and the limit plate, and a plurality of elastic components are also provided in the sealed tank body, one end of the elastic component is connected to the inner wall of the sealed tank body close to the downstream end, and the other end is fixed to the limit plate, and each of the elastic components is evenly distributed along the circumference of the sealed tank body.

[0011] Preferably, the capacitor module includes a plurality of filter capacitors connected in parallel and a fixed plate coaxially mounted on the central axis, and a plurality of clamps are evenly distributed on the fixed plate along the circumference of the sealed tank body, and each of the filter capacitors is embedded and fixed in each of the clamps one by one.

[0012] Preferably, the sealed tank body includes a sleeve and end covers coaxially arranged at both ends of the sleeve, and the sleeve and the end covers are detachably connected.

[0013] Preferably, a pressure plate is coaxially provided at the end of the transformer in a tightly fitting manner.

[0014] Preferably, the sealed tank body is made of aluminum.

[0015] Preferably, the main control device is a single chip microcomputer.

[0016] Preferably, the external dedicated device is any one or more of a camera, a pan / tilt head, an underwater searchlight or a manipulator.

[0017] The present invention also provides a cable-controlled remote-controlled underwater device, comprising a body and an electric drive system, wherein the electric drive system is any one of the electric drive systems described above.

[0018] Compared with the above-mentioned background technology, the electric drive system provided by the present invention adopts electricity as the power source for the relevant operating components of the entire system during its assembly and operation, so that the external structure of the assembled electric drive system is more regular and compact, and the required assembly space is correspondingly reduced, thereby making the overall structural volume of the cable-controlled underwater equipment equipped with the electric drive system correspondingly reduced, thereby making the underwater operation resistance of the cable-controlled underwater equipment correspondingly reduced, the energy consumption during underwater operation reduced, and the endurance of a single underwater operation correspondingly increased; at the same time, the coaxial assembly structure based on the central axis can make the assembly structure of the internal components of the main control device more compact, and the overall structure of the electric drive system after assembly is more regular and sophisticated, thereby making it possible to further efficiently utilize the assembly space of the cable-controlled underwater equipment, and further reduce the overall assembly volume of the underwater operation part of the cable-controlled underwater equipment.

[0019] In another preferred embodiment of the present invention, a buffer resistor connected in parallel with the external dedicated device is connected downstream of the capacitor module, the buffer resistor is connected downstream of the capacitor module, and an insulating plate coaxially mounted on the central axis is provided between the buffer resistor and the capacitor module. By providing a buffer resistor connected in parallel with the external dedicated device in the main control device, the current passing through the external dedicated device when the device starts will not be too large, effectively avoiding the instantaneous current impact and excessive energy consumption caused to the external dedicated device and its related electrical connection components when the device starts, and in the subsequent operation of the device, the parallel circuit structure between the buffer resistor and the external dedicated device can make the current passing through the external dedicated device more stable, thereby effectively protecting the external dedicated device and its related electrical connection components downstream from the influence of excessive current, avoiding damage to modules and components caused by excessive transient current, and making the operation process of the electric drive system and the entire underwater equipment more stable and reliable, and having a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the coordination process of working components of an electric drive system provided in a specific embodiment of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the external structure of the power supply unit;

[0023] Figure 3 for Figure 2 Schematic diagram of the internal component assembly structure;

[0024] Figure 4 for Figure 3 Circuit schematic diagram;

[0025] Figure 5 for Figure 1 Schematic diagram of the coordination process of the working components of the mid-shore control center;

[0026] Figure 6 The present invention is a schematic diagram of the three-dimensional structure of a cable-controlled underwater device provided in a specific embodiment of the present invention.

[0027] Among them, 11-sealed tank body, 111-sleeve, 112-end cover, 113-center axis, 114-cabin penetration part, 12-transformer, 121-pressure plate, 13-rectifier, 14-capacitor module, 141-filter capacitor, 142-fixing plate, 143-clamp, 15-buffer resistor, 151-insulating plate, 152-limiting plate, 153-elastic component, 21-power supply and multi-channel interface unit, 22-main control device, 23-power supply unit, 24-thruster, 25-external special equipment, 26-body, 31-shore control center, 32-insulation monitoring module, 33-shore transformer unit, 34-shore computer, 35-switch unit. DETAILED DESCRIPTION

[0028] The core of the present invention is to provide an electric drive system, which has a relatively regular and rational structural layout and requires a smaller assembly space, thereby reducing the overall weight of the cable-controlled underwater equipment and reducing the operating resistance of the cable-controlled underwater equipment accordingly; at the same time, a cable-controlled underwater equipment using the above-mentioned electric drive system is provided.

[0029] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] Please refer to Figures 1 to 6 , Figure 1 A schematic diagram of the coordination process of working components of an electric drive system provided in a specific embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the external structure of the power supply unit; Figure 3 for Figure 2 Schematic diagram of the internal component assembly structure; Figure 4 for Figure 3Circuit schematic diagram; Figure 5 for Figure 1 Schematic diagram of the coordination process of the working components of the mid-shore control center 31; Figure 6 The present invention is a schematic diagram of the three-dimensional structure of a cable-controlled underwater device provided in a specific embodiment of the present invention.

[0031] In a specific embodiment, the electric drive system provided by the present invention includes a shore control center 31, a power supply and multi-channel interface unit 21, a main control device 22, a power supply unit 23 and a thruster 24. The shore control center 31 is communicated with the main control device 22 and the power supply unit 23 through the power supply and multi-channel interface unit 21. The shore control center 31 and the power supply and multi-channel interface unit 21, and the power supply and multi-channel interface unit 21 and the power supply unit 23 are electrically connected through an umbilical cable. A number of external special equipment 25 are connected downstream of the main control device 22. The power supply unit 23 supplies power to the main control device 22, the thruster 24 and the external special equipment 25; the shore control center 31 includes an insulation monitoring module 32, which can convert low-frequency and low-voltage AC power into high-frequency and high-voltage AC power. The shore-side transformer unit 33 for current flow, the shore-side computer 34 that can control the operation of the external special equipment 25, and the switch unit 35 connected to the shore-side computer 34 and ensuring network interaction, the insulation monitoring module 32 cooperates with the various power-connected components of the power drive system and communicates with the shore-side computer 34 through the switch unit 35; the power supply unit 23 includes a sealed tank body 11, and the inner cavity of the sealed tank body 11 is provided with a transformer 12, a rectifier 13 and a capacitor module 14 that are sequentially connected to the downstream of the power supply and multi-channel interface unit 21 along the current direction. A central axis 113 is coaxially arranged in the inner cavity of the sealed tank body 11, and the transformer 12, rectifier 13 and capacitor module 14 are all coaxially mounted on the central axis 113 in sequence, and the inner cavity of the sealed tank body 11 is filled with transformer oil.

[0032] During its assembly and operation process, since electricity is used as the power source for the relevant operating components of the entire system, the component structure of the assembled electric drive system is more regular and compact, and the required assembly space is correspondingly reduced, thereby reducing the overall weight of the cable-controlled underwater equipment equipped with the electric drive system, thereby reducing the underwater operation resistance of the cable-controlled underwater equipment, reducing the energy consumption during underwater operation, and increasing the endurance of a single underwater operation; at the same time, the coaxial assembly structure based on the central axis 113 can make the assembly structure of the internal components of the power supply unit 23 more compact, and the main control device 22 and the power supply unit 23 are both installed in the form of a sealed tank at the bottom of the body 26 of the cable-controlled underwater equipment, thereby further efficiently utilizing the assembly space of the cable-controlled underwater equipment, and further reducing the overall assembly volume of the underwater operation part of the cable-controlled underwater equipment.

[0033] Specifically, when the equipment is operating, the shore-side transformer unit 33 boosts the 50Hz / 380V industrial AC power supplied from the industrial power grid to a high-frequency, high-voltage AC power supply of 400Hz / 3000V. High-voltage alternating current is used because it reduces the supply current, thereby reducing the core diameter of power cables such as umbilical cables. High-frequency (400Hz) alternating current significantly reduces the overall size and weight of the power supply unit 23. The principle is that, at the same power output, the higher the frequency of the transformer 12, the smaller the magnetic core and the fewer turns per volt. Based on this, although the high-frequency transformer 12 has a small core and a low maximum magnetic flux, it operates at a high frequency and the magnetic flux changes rapidly, allowing it to generate sufficient potential even with a small core and a small number of turns. The opposite is true at low frequencies.

[0034] On this basis, high-frequency and high-voltage alternating current is transmitted to the multi-channel power interface unit via the umbilical cable, and the power supply and multi-channel interface unit 21 further distributes and transmits the high-frequency and high-voltage alternating current to each power supply unit 23 through the umbilical cable, so that the transformer 12, rectifier 13 and capacitor module 14 in the power supply unit 23 work together to convert the 400HZ / 3000V high-frequency and high-voltage alternating current into 400HZ / 300V high-frequency and low-voltage direct current that has been filtered and stabilized, and the high-frequency and low-voltage alternating current is respectively transmitted to the thruster 24 and each external special equipment 25 to ensure the stable and continuous operation of the thruster 24 and each external special equipment 25, thereby realizing the integrated design of each underwater operation component, greatly improving the integration of the main components of the cable-controlled underwater equipment, and optimizing the overall structure and assembly volume of the equipment.

[0035] In addition, when the equipment is running, the shore computer 34 realizes power and communication connection with the main control device 22 through the multi-way power interface unit, thereby controlling the action mechanism composed of the thruster 24 and the external special equipment 25 to perform corresponding actions, and the main control device 22 returns the corresponding action status and the operating status of each relevant module and component and other information to the shore computer 34, so that the staff can judge the next action of the equipment and implement the corresponding operation process according to the feedback information received by the shore computer 34; at the same time, the insulation monitoring module 32 monitors the insulation of the power supply unit 23, the main control device 22, the multi-way power interface unit and each umbilical cable and other powered components in real time, and transmits the monitoring information to the shore computer 34 in real time, so that when the relevant equipment or cables have insulation abnormalities such as leakage, the shore computer 34 can cut off the power supply of the entire equipment in time to avoid damage to equipment components or other safety accidents, thereby ensuring the stable and safe operation of cable-controlled underwater equipment.

[0036] It should be noted that, specifically in practical applications, the transformer oil filled in the inner cavity of the sealed tank body 11 can fully ensure the mutual insulation between the non-connected components in the inner cavity, eliminate the arc that may exist in the inner cavity of the sealed tank body 11 during the operation of the equipment, and effectively provide efficient heat dissipation for the components in the inner cavity.

[0037] In addition, it should be noted that in actual applications, penetration pieces 114 connecting the internal components and external components can be provided at both ends of the sealed tank body 11. Each penetration piece 114 can have both power supply and communication capabilities, or can be separately arranged as a penetration piece 114 with only power supply capability or communication capability. In actual applications, the staff can flexibly select and adjust according to the actual working conditions. In principle, as long as it can meet the actual working and operation needs of the electric drive system, it can be used.

[0038] It should be pointed out that, in practical applications, the main control device 22 can generally be an ARM single-chip microcomputer, and sealed in a cylindrical tank. Other devices with data processing and integrated control capabilities can also be flexibly selected according to actual working conditions. In principle, as long as it can meet the actual working needs of the electric drive system and ensure the overall stable operation of the cable-controlled underwater equipment, it can be used.

[0039] It should be further pointed out that, in actual applications, the above-mentioned external dedicated equipment 25 can be a variety of electrical devices or terminals such as cameras, pan-tilt heads, underwater searchlights and manipulators. The staff can flexibly select and assemble them according to the actual working conditions. In principle, as long as it can meet the corresponding working requirements of the cable-controlled underwater equipment, it can be used.

[0040] In addition, as shown in the figure, double-arrow lines indicate that the components at both ends of the double-arrow line are connected for communication, and single-arrow lines indicate that the components at both ends of the single-arrow line are powered in the direction indicated by the arrows. The communication and power connection layout shown in this figure is for illustrative purposes only. The communication and power connection relationships between components can be flexibly adjusted according to different requirements under specific operating conditions. In principle, any connection that can meet the operating requirements of the electric drive system can be used.

[0041] Furthermore, in the inner cavity of the sealed tank 11, a buffer resistor 15 connected in parallel with the external dedicated device 25 is connected downstream of the capacitor module 14, and an insulating plate 151 coaxially mounted on the central axis 113 is provided between the buffer resistor 15 and the capacitor module 14. By providing the buffer resistor 15 in parallel with the external dedicated device 25 in the power supply unit 23, the current passing through the external dedicated device 25 will not be too large when the device starts, effectively avoiding the transient current impact and excessive energy consumption caused to the external dedicated device 25 and its related electrical connection components when the device starts. In the subsequent operation of the device, the parallel circuit structure between the buffer resistor 15 and the external dedicated device 25 can make the current passing through the external dedicated device 25 more stable, thereby effectively protecting the external dedicated device 25 and its related electrical connection components downstream from the influence of excessive current, avoiding damage to modules and components caused by excessive transient current, and making the operation process of the electric drive system and the entire underwater device more stable and reliable, and extending the service life.

[0042] Furthermore, a limit plate 152 is positioned downstream of the insulating plate 151, with the buffer resistor 15 positioned between the two. Several elastic components 153 are embedded between the limit plate 152 and the end wall of the sealed tank 11's inner cavity, near the downstream penetration member 114. These components 153 are evenly distributed along the circumference of the sealed tank 11. During and after assembly, the limit plate 152 moves in response to the axial deformation of the elastic components 153. These components 153 effectively mitigate structural impact and assembly stress between connected components, ensuring the overall assembly strength and structural reliability of the electric drive system.

[0043] It should be noted that in practical applications, the elastic component 153 can preferably be a spring to simplify its structure and ensure a more reliable and efficient transmission of elastic force and component operation. Of course, personnel can flexibly select the specific structural form of the elastic component 153 based on actual operating conditions. In principle, any structural form that can meet the actual assembly and operation requirements of the electric drive system is acceptable.

[0044] Furthermore, the capacitor module 14 includes several filter capacitors 141 and a fixing plate 142 coaxially mounted on the central axis 113. Several clamps 143 are evenly distributed on the fixing plate 142 along the circumference of the sealed can 11. Each filter capacitor 141 is correspondingly embedded and fixed within a clamp 143. The fixing plate 142 and the clamps 143 work together to provide reliable structural support for each filter capacitor 141. The circumferentially evenly distributed structure helps further improve the component integration and assembly efficiency of the capacitor module 14, making the overall structure of the electric drive system more compact and regular.

[0045] Specifically, the sealed tank body 11 includes a sleeve 111 and end caps 112 coaxially disposed at both ends of the sleeve 111. The sleeve 111 and the end caps 112 are detachably threadedly connected. The sleeve 111 and the end caps 112 are independent components, and their production process is relatively simple and efficient. After the sleeve 111 and the end caps 112 are manufactured and processed as independent components, they are then threadedly connected and assembled into the sealed tank body 11. This can effectively reduce the production difficulty and cost of the sealed tank body 11 and improve its assembly efficiency.

[0046] More specifically, the ends of the central shaft 113 are removably fastened to the end caps 112. Specifically, nuts fitted onto the central shaft 113 are provided between the transformer 12 and its adjacent end caps 112, between the transformer 12 and the rectifier 13, and between the rectifier 13 and the capacitor module 14. These nuts secure the transformer 12, rectifier 13, and capacitor module 14 in place. This threaded fastening structure is simple, reliable, and easy to operate, further reducing the difficulty of assembling the electric drive system and improving operational efficiency.

[0047] On the other hand, a pressure plate 121 is coaxially provided at the end of the transformer 12 in a tightly fitting manner. The pressure plate 121 can provide reliable structural support for the transformer 12, ensuring reliable fixation and stable operation of the transformer 12. The rectifier 13 preferably adopts a bridge rectifier, and a terminal block is provided on the rectifier 13 for connecting and fixing the various cables in the sealed tank 11.

[0048] Furthermore, the sealed tank body 11 is a cylindrical aluminum component. In practical applications, the material of the sealed tank body 11 is not limited to this. Depending on the actual operating conditions, other metal materials that meet the assembly and use requirements of the electric drive system can also be used. However, it should be noted that due to the battery effect produced by different metal materials in seawater, the main structural components of the sealed tank body 11 cannot be manufactured using composite metal materials and should preferably be made of a single material.

[0049] In a specific embodiment, the cable-controlled underwater device provided by the present invention includes a body 26 and an electric drive system, wherein the electric drive system is the electric drive system described in the above embodiment. The cable-controlled underwater device is relatively compact and has low operating resistance during underwater operation.

[0050] In summary, it can be seen that during the assembly and operation of the electric drive system provided in the present invention, since electricity is used as the power source for the relevant operating components of the entire system, the external structure of the assembled electric drive system is more regular and compact, wherein the main control device and the power supply unit respectively adopt cylindrical sealed tank structures and are regularly installed at the bottom of the body of the cable remote-controlled underwater equipment. The required assembly space is correspondingly reduced, so that the overall weight of the cable remote-controlled underwater equipment equipped with the electric drive system is correspondingly reduced, thereby reducing the underwater operation resistance of the cable remote-controlled underwater equipment accordingly, reducing the energy consumption during underwater operation, and increasing the endurance of a single underwater operation accordingly; at the same time, the coaxial assembly structure based on the central axis can make the assembly structure of the internal components of the power supply unit more compact, and the overall structure of the power supply unit after assembly is more regular and sophisticated, so that the assembly space of the cable remote-controlled underwater equipment can be further efficiently utilized, and the overall assembly volume of the underwater operation part of the cable remote-controlled underwater equipment can be further reduced.

[0051] In addition, the cable-controlled underwater equipment provided by the present invention that uses the above-mentioned electric drive system has a relatively compact overall size and has low operating resistance during underwater operations.

[0052] The above is a detailed introduction to the electric drive system provided by the present invention and the cable-controlled remote-controlled underwater equipment using the electric drive system. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electric drive system, characterized in that: The system comprises a shore control center, a power supply and multi-channel interface unit, a main control device, a power supply unit and a thruster. The shore control center is communicatively connected to the main control device and the power supply unit respectively through the power supply and multi-channel interface unit. The shore control center and the power supply and multi-channel interface unit, as well as the power supply and multi-channel interface unit and the power supply unit, are electrically connected via an umbilical cable. Several external dedicated devices are connected downstream of the main control device. The power supply unit supplies power to the main control device, the thruster and the external dedicated devices. The shore control center includes an insulation monitoring module, a shore transformer unit capable of converting low-frequency, low-voltage alternating current into high-frequency, high-voltage alternating current, a shore computer capable of controlling the operation of the external dedicated equipment, and a switch unit connected to the shore computer and ensuring network interaction. The insulation monitoring module cooperates with the power-connected components of the electric drive system and is communicatively connected to the shore computer through the switch unit. The insulation monitoring module monitors the insulation of the power supply unit, the main control device, the power supply and multi-channel power interface unit, and each of the umbilical cables in real time, and transmits the monitoring information to the shore computer in real time. The power supply unit includes a sealed tank body, wherein a transformer, a rectifier, and a capacitor module are sequentially connected to the downstream of the power supply and multi-channel interface unit along the current direction. A central axis is coaxially arranged in the inner cavity of the sealed tank body, and the transformer, the rectifier, and the capacitor module are coaxially sleeved on the central axis in sequence. The inner cavity of the sealed tank body is filled with transformer oil. A buffer resistor connected in parallel with the external dedicated device is further provided in the inner cavity of the sealed tank, the buffer resistor is connected downstream of the capacitor module, and an insulating plate coaxially sleeved on the central axis is provided between the buffer resistor and the capacitor module; The electric drive system is used for a cable-controlled underwater device; the power supply unit and the main control device are both installed in the form of sealed tanks at the bottom of the body of the cable-controlled underwater device; the central axes of the power supply unit and the main control device are both arranged along the front-to-back direction of the cable-controlled underwater device; A limit plate located downstream of the insulating plate is coaxially mounted on the central axis, the buffer resistor is arranged between the insulating plate and the limit plate, and a plurality of elastic components are also provided in the sealed tank body, one end of the elastic component is connected to the inner wall of the sealed tank body close to the downstream end, and the other end is fixed to the limit plate, and each of the elastic components is evenly distributed along the circumference of the sealed tank body.

2. The electric drive system according to claim 1, wherein: The capacitor module includes a plurality of filter capacitors connected in parallel and a fixed plate coaxially mounted on the central axis. A plurality of clamps are evenly distributed on the fixed plate along the circumference of the sealed tank body. The filter capacitors are embedded and fixed in each clamp one by one.

3. The electric drive system according to claim 1, wherein: The sealed tank body comprises a sleeve and end covers coaxially arranged at both ends of the sleeve, and the sleeve and the end covers are detachably connected.

4. The electric drive system according to claim 1, wherein: A pressure plate is coaxially arranged at the end of the transformer in close contact.

5. The electric drive system according to claim 1, wherein: The sealed tank body is made of aluminum.

6. The electric drive system according to claim 1, wherein: The main control device is a single chip microcomputer.

7. The electric drive system according to claim 1, wherein: The external dedicated device is any one or more of a camera, a pan / tilt head, an underwater searchlight or a manipulator.

8. A cable-controlled underwater device comprising a body and an electric drive system, characterized in that: The electric drive system is the electric drive system according to any one of claims 1 to 7.

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