Multi-layer nested slip ring for 15MW ship electric propulsion system

Abstract

The invention discloses a multilayer nested slip ring for a 15MW ship electric propulsion system, which relates to the technical field of ship electric propulsion systems and comprises an angle measurement module, a signal slip ring, a fluid slip ring and a high-power slip ring, an air blower, a fan heater and a plurality of temperature and humidity sensors are arranged in the high-power slip ring, and temperature and humidity indexes in the slip ring are monitored and fed back in real time. The internal temperature and humidity of the slip ring can be regulated and controlled by controlling the operation of the warm air blower and the air blower, and the phenomenon of arc discharge failure caused by high-temperature overheating failure or low-temperature condensation is prevented; according to the invention, the multi-layer nested structure design is adopted, the repeated utilization of the axial space is realized, and the overall height of the slip ring is effectively reduced; the angle measurement module adopts a double-rotary-transformer redundancy design, so that the rudder angle indication reliability and the environmental adaptability of the ship electric propulsion system are improved; the device integrates power, signal, oil and gas rotary transmission functions, and has the advantages of being high in transmission power, high in vibration resistance, high in reliability, good in maintainability and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of ship electric propulsion systems, and in particular to a multi-layer nested slip ring for a 15MW ship electric propulsion system. Background Art

[0002] Compared with the traditional direct drive mode, the ship electric propulsion system has the characteristics of flexibility, low noise and vibration, flexible layout and green environmental protection, and has gradually become one of the mainstream trends of future ship power technology. As the only channel for power, signal and fluid rotation transmission of the ship electric propulsion system, the reliability of the slip ring used in the ship electric propulsion system directly affects the stable operation of the ship.

[0003] Although a few domestic enterprises have conducted some research on slip rings for ship electric propulsion systems, there are still problems such as small number of loops, poor transmission power, poor maintainability, and low reliability. Therefore, it is extremely important to design a slip ring for ship electric propulsion systems that has a compact structure, multiple loops (15 loops), high power (≥15MW), and high reliability (≥10 years). Summary of the invention

[0004] In view of the above technical problems, the present invention proposes a multi-layer nested slip ring for a 15MW ship electric propulsion system to solve the problems arising from the above background technology.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions: A multi-layer nested slip ring for a 15MW ship electric propulsion system comprises an angle measurement module, a fluid slip ring interface box, a signal slip ring, a fluid slip ring, a fluid slip ring transmission shaft, and a high-power slip ring. The high-power slip ring is connected to the hull, and the fluid slip ring main shaft and the signal slip ring main shaft are connected to the rotating end of the high-power slip ring through the fluid slip ring transmission shaft and keep synchronous operation. The fluid slip ring interface box is installed at the upper end of the high-power slip ring, and the angle measurement module is installed above the fluid slip ring interface box to achieve accurate measurement of the rudder angle of the ship electric propulsion system. Preferably, the high-power slip ring comprises a main frame, a ring segment assembly, stacked insulators, a high-power junction box, a fluid slip ring drive shaft, a main load-bearing bearing, and a rotor base. The main frame is connected to the hull, the rotor end of the main load-bearing bearing is fixedly connected to the rotor base, and the stator end of the main load-bearing bearing is fixedly connected to the main frame, thereby realizing a slewing bearing of the rotor base; the fluid slip ring drive shaft is connected to the rotor base, thereby realizing synchronous operation of the high-power slip ring and the fluid slip ring rotor end; the rotor ring segments of the ring segment assembly are stacked and installed on the rotor base by stacking insulators, and the stator ring segments of the ring segment assembly are installed on the stator ring segment pillars through insulators; and the high-power junction box is wall-mounted on both sides of the main frame to realize connection with the user line.

[0006] Preferably, the slip rings for the ship electric propulsion system adopt a multi-layer nested structure design, which includes a high-power slip ring, a fluid slip ring, and a signal slip ring from the outside to the inside.

[0007] Preferably, the high-power slip ring adopts a 15-loop stacking design, a multi-layer loop insulation spacing and a slip ring structure compact design, the rotor outlet copper bar adopts a double-layer octagonal distribution form, and is installed on the rotor base through an insulator.

[0008] Preferably, a blower, a heater, a ventilation grille and a plurality of temperature and humidity sensors are provided in the high-power slip ring. The blower and heater are wall-mounted on the lower side of the main frame cover plate, the ventilation grille is installed on the other side cover plate of the main frame, and the plurality of temperature and humidity sensors are installed on the main frame (61) to monitor and feedback the temperature and humidity indexes inside the slip ring in real time, and to control the operation of the heater and the blower to adjust the temperature and humidity inside the slip ring.

[0009] Preferably, the angle measurement module adopts a dual rotary transformer redundant design.

[0010] Preferably, the high-power junction box is equipped with multiple sets of knife switches to achieve manual disconnection of the loop. One side of the box door is supported by 4 sets of hinges and is equipped with hydraulic struts. The other side of the box door is fixed to the box body with slotted captive screws to improve the vibration resistance of the box body.

[0011] Preferably, the main load-bearing bearing adopts a cross roller bearing, which has strong axial and radial load-bearing capacity and anti-overturning moment performance, ensuring that the slip ring shaft system for the ship's electric propulsion system has strong stability.

[0012] Preferably, the main frame includes a top plate, lifting eye screws, main supporting columns, stator ring segment pillars, and a bottom plate. Four lifting eye screws are provided on the top of the top plate to realize the overall lifting of the slip ring for the ship's electric propulsion system. The top plate, the bottom plate, and the main supporting columns are assembled by screw connection to form the main load-bearing structure of the main frame. One end of the stator ring segment pillar is installed on the bottom plate, and the other end is connected to the top plate.

[0013] Preferably, the main frame is a rectangular structure with standard 90° corners, and the main support columns can be directly made of standard profiles, which can effectively reduce production costs and shorten production cycles.

[0014] Preferably, the stator ring support is provided with waist-shaped adjustment holes in radial and axial directions, which can adapt to the processing and assembly errors of the stator ring, main support column, bottom plate and top plate, and improve the assembly processability of the slip ring of the ship electric propulsion system.

[0015] The beneficial effects of the present invention compared with the prior art are: (1) The slip ring for the ship electric propulsion system disclosed in the present invention adopts a multi-layer nested structure design, which includes a high-power slip ring, a fluid slip ring, and a signal slip ring from the outside to the inside, thereby realizing the reuse of the axial space and effectively reducing the overall height of the slip ring; (2) The high-power slip ring in the present invention adopts a 15-loop stacking design, which comprehensively considers the insulation spacing of the multi-layer loops and the compactness of the slip ring structure. The rotor outlet copper bar adopts a double-layer octagonal distribution form, which can minimize the radial size of the slip ring for the ship's electric propulsion system; one end of the rotor outlet copper bar is installed on the inner side of the rotor ring plate, and the other end is installed on the rotor base through an insulator to achieve support at both ends, effectively avoiding the phenomenon of arc discharge caused by the shortening of the insulation spacing between the two electrodes due to the vibration of the ship's electric propulsion system. (3) The high-power slip ring of the present invention is equipped with a blower, a heater, multiple temperature and humidity sensors and a ventilation grille. The blower and heater are wall-mounted at the lower part of the side cover of the main frame, and the ventilation grille is installed at the upper part of the cover on the other side of the main frame. Multiple temperature and humidity sensors are installed at different positions of the main frame to monitor and feedback the internal temperature and humidity indicators of the slip ring in real time. By controlling the operation of the heater and blower, the internal temperature / humidity of the slip ring can be adjusted to prevent high-temperature overheating failure or low-temperature condensation causing arc discharge failure; (4) The high-power junction box of the present invention is equipped with multiple sets of knife switches to realize manual disconnection of the loop. One side of the box door is supported by 4 sets of hinges and equipped with hydraulic support rods to facilitate daily maintenance of the high-power junction box. The other side is fixed to the box body with slotted captive screws to improve the vibration resistance of the box body. (5) Common angle sensors include mechanical rudder angle indicators, synchronizers, gratings, angle encoders, rotary transformers, etc. The mechanical rudder angle indicator has low measurement accuracy. The synchronizer is based on the principle of weak signal electromagnetic induction and has relatively weak anti-electromagnetic interference capability. The gratings and angle encoders both use optical principles and have poor accuracy stability in environments such as water mist and condensation. They also have relatively poor adaptability to the marine environment. The rotary transformer has relatively high accuracy and strong environmental adaptability. The angle measurement module of the present invention adopts a dual rotary transformer redundant design, which can effectively improve the reliability and environmental adaptability of the angle measurement module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the slip ring structure of the pod-type ship electric propulsion system of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the angle measurement module of the present invention.

[0018] Figure 3 It is a schematic diagram of the signal slip ring structure of the present invention.

[0019] Figure 4It is a schematic diagram of the structure of the fluid slip ring of the present invention.

[0020] Figure 5 It is a schematic diagram of the high-power slip ring structure of the present invention.

[0021] Figure 6 It is a schematic diagram of the main frame structure of the present invention.

[0022] Figure 7 It is a schematic diagram of the structure of the ring piece assembly of the present invention.

[0023] Figure 8 It is a schematic diagram of the structure of the high-power slip ring rotor outlet terminal of the present invention.

[0024] Fig. 9 It is a structural schematic diagram of a high-power junction box of the present invention.

[0025] Figure numbers: 1-angle measurement module; 2-fluid slip ring interface box; 3-signal slip ring; 4-fluid slip ring; 5-fluid slip ring transmission shaft; 6-high power slip ring; 11-resolver cover; 12-main angle measurement resolver; 13-resolver rotor mounting seat; 14-auxiliary angle measurement resolver; 15-resolver adapter; 31-signal ring extension shaft; 32-signal ring stator mounting seat; 33-signal ring housing; 34-signal ring main shaft; 41-fluid slip ring main shaft; 42-fluid slip ring auxiliary slewing bearing; 43-fluid slip ring housing; 44-fluid slip ring main support bearing; 61-main frame; 62-ring assembly; 63-stack insulator; 64-high power junction box; 65-fluid slip ring drive shaft; 66 -main bearing; 67-rotor base; 611-blower; 612-heater; 613-temperature sensor; 614-top plate; 615-lifting eye screw; 616-ventilation grille; 617-main support column; 618-stator ring support; 619-bottom plate; 621-stator ring adapter; 622-insulator; 623-stator ring; 624-rotor ring; 625-rotor outlet copper busbar; 626-carbon brush; 627-tension spring; 628-carbon brush adapter; 629-carbon brush bracket; 641-box; 642-stuffing box; 643-current input copper busbar; 644-support seat; 645-square tube bracket; 646-knife switch; 647-box door. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0027] Example: Figure 1-Figure 9A multi-layer nested slip ring for a 15MW ship electric propulsion system is shown, comprising an angle measuring module 1, a fluid slip ring interface box 2, a signal slip ring 3, a fluid slip ring 4, a fluid slip ring transmission shaft 5, and a high-power slip ring 6. The high-power slip ring 6 is connected to the hull, and the main shaft of the fluid slip ring 4 and the main shaft of the signal slip ring 3 are connected to the rotating end of the high-power slip ring 6 through the fluid slip ring transmission shaft 5 and keep synchronous operation. The fluid slip ring interface box 2 is installed on the upper end of the high-power slip ring 6, and the angle measuring module 1 is installed above the fluid slip ring interface box 2 to achieve accurate measurement of the rudder angle of the ship electric propulsion system.

[0028] The structure of the angle measurement module 1 is as follows Figure 2 As shown, it includes a resolver cover plate 11, a main angle measuring resolver 12, a resolver rotor mounting seat 13, an auxiliary angle measuring resolver 14, and a resolver adapter 15. The angle measuring module 1 adopts a dual resolver redundant design based on the characteristics of high angle measurement accuracy and strong environmental adaptability of the resolver. The stators of the main angle measuring resolver 12 and the auxiliary angle measuring resolver 14 are fixedly connected to the fluid slip ring interface box 2 and the resolver adapter 15 respectively, and the rotor is connected to the signal ring extension shaft 31 through the resolver rotor mounting seat 13 to achieve reliable measurement of the rudder angle.

[0029] The structure of signal slip ring 3 is as follows Figure 3 As shown, it includes a signal ring extension shaft 31, a signal ring stator mounting seat 32, a signal ring housing 33, and a signal ring main shaft 34. The signal ring stator mounting seat 32 is fixedly mounted on the fluid slip ring housing 43 and connected to the signal ring housing 33. The signal ring main shaft 34 is mounted in the signal ring housing 34 through deep groove ball bearing slewing bearings placed on both sides. A quadrilateral notch is provided at the end of the signal ring main shaft 34 to facilitate its connection with the fluid slip ring main shaft 41.

[0030] The structure of fluid slip ring 4 is as follows Figure 4 As shown, it includes a fluid slip ring main shaft 41, a fluid slip ring auxiliary slewing bearing 42, a fluid slip ring housing 43, and a fluid slip ring main support bearing 44. The fluid slip ring housing 43 is fixedly mounted on a high-power slip ring top plate 614. The fluid slip ring main shaft 41 is slewingly supported in the fluid slip ring housing 43 through the fluid slip ring main support bearing 44 and the fluid slip ring auxiliary slewing bearing 42. According to different annular channel pressures, single-layer or multi-layer dynamic sealing rings are flexibly used between the annular channels of the fluid slip ring 4 to achieve reliable sealing of the fluid slip ring.

[0031] The slip rings used in the ship electric propulsion system adopt a multi-layer nested structure design, which includes a high-power slip ring 6, a fluid slip ring 4, and a signal slip ring 3 from the outside to the inside, so as to realize the reuse of the axial space and effectively reduce the overall height of the slip ring.

[0032] High power slip ring 6 structure as follows Figure 5As shown, it includes a main frame 61, a ring segment assembly 62, a stacking insulator 63, a high-power junction box 64, a fluid slip ring drive shaft 65, a main bearing 66, and a rotor base 67. The main frame 61 is connected to the hull, the rotor end of the main bearing 66 is fixedly connected to the rotor base 67, and the stator end of the main bearing 66 is fixedly connected to the main frame 61, so as to realize the slewing bearing of the rotor base 67; the rotor base 67 is connected to the fluid slip ring drive shaft 65, so as to realize the synchronous operation of the rotor ends of the high-power slip ring 6 and the fluid slip ring 4. The rotor ring segments 624 of the ring segment assembly 62 are stacked and installed on the rotor base 67 by stacking insulators 63, the stator ring segments 623 are installed on the stator ring segment pillars 618 through the insulators 622, and the high-power junction box 64 is wall-mounted on both sides of the main frame 61 to realize the quick connection with the user line.

[0033] The main load-bearing bearing 66 adopts a cross roller bearing, which has strong axial and radial load-bearing capacity and anti-overturning moment performance, ensuring that the slip ring shaft system used in the ship's electric propulsion system has strong stability.

[0034] The structure of the main frame 61 is as follows Figure 6 As shown, it includes a blower 611, a heater 612, a temperature and humidity sensor 613, a top plate 614, eye screws 615, a ventilation grille 616, a main support column 617, a stator ring column 618, and a bottom plate 619. Four eye screws 615 are arranged on the top of the top plate 614 to realize the overall lifting of the slip ring for the ship electric propulsion system. The top plate 614, the bottom plate 619, and the main support column 617 are assembled by screw connection to form the main load-bearing structure of the main frame 61. One end of the stator ring column 618 is installed on the bottom plate 619, and the other end is connected to the top plate 614. The rotor ring 624 of the ring assembly 62 is stacked and installed on the rotor base 67 using stacking insulators 63, and the stator ring 623 is installed on the stator ring column 618 through the insulator 622.

[0035] The main frame 61 is a rectangular structure, and its corners are all standard 90 degrees. The main support columns 617 can be directly made of standard profiles, which can effectively reduce production costs and shorten production cycles.

[0036] The stator ring support 618 is provided with waist-shaped adjustment holes in radial and axial directions, which can adapt to the processing and assembly errors of the stator ring 623, the main support column 617, the bottom plate 619, and the top plate 614, and improve the assembly processability of the slip ring of the ship's electric propulsion system.

[0037] A blower 611, a heater 612, a plurality of temperature and humidity sensors 613 and a ventilation grille 616 are arranged in the main frame 61. The blower 611 and the heater 612 are wall-mounted at the lower position of the side cover plate of the main frame 61, and the ventilation grille 616 is installed at the upper position of the cover plate on the other side of the main frame 61. A plurality of temperature and humidity sensors 613 are installed at different positions of the main frame 61 to monitor and feedback the temperature and humidity indicators inside the slip ring in real time. By controlling the operation of the blower 611 and the heater 612, the internal temperature / humidity of the slip ring for the ship's electric propulsion system can be adjusted to prevent high-temperature overheating failure or arc discharge failure caused by low-temperature condensation.

[0038] The ring plate assembly 62 has a structure as follows: Figure 7 As shown, it includes a stator ring adapter 621, an insulator 622, a stator ring 623, a rotor ring 624, a rotor outlet copper bar 625, a carbon brush 626, a tension spring 627, a carbon brush adapter 628, and a carbon brush bracket 629. The stator ring 623 is an octagonal structure, which is formed by bending and splicing two standard copper busbars. The stator ring 623 is fixed to the stator ring support through the insulators 622 and the stator ring adapter 621 evenly distributed in four places. On 618, the rotor ring segment 624 is stacked and installed on the rotor base 67 using stacked insulators 63. In order to achieve high-reliability rotational power transmission of the ring segment assembly 62, four carbon brushes 626 are evenly distributed between the stator ring segment 623 and the rotor ring segment 624. The carbon brush 626 achieves flexible support with the stator ring segment 624 under the action of the carbon brush bracket 629 and the carbon brush adapter 628, and achieves stable electrical contact with the rotor ring segment 624 under the tension of the tension spring 627.

[0039] The carbon brush 626 is made of modified copper-carbon material, and the rotor ring 624 is made of zirconium-chromium-copper material with good conductivity and wear resistance. The wear of the friction pair material is as low as 10-15, which can realize maintenance-free throughout the life cycle of the carbon brush 626 and meet the 10-year reliable operation requirement of the slip ring for ship electric propulsion system.

[0040] The structure of the high-power slip ring rotor outlet terminal is as follows: Figure 8 As shown, the high-power slip ring 6 adopts a 15-loop stacking design, comprehensively considering the insulation spacing of the multi-layer loops and the compactness of the slip ring structure. The rotor outlet copper bar 625 adopts a double-layer octagonal distribution form, which can minimize the radial size of the slip ring for the ship's electric propulsion system. One end of the rotor outlet copper bar 625 is installed on the inner side of the rotor ring 624, and the other end is installed on the rotor base 67 through an insulator to achieve support at both ends, effectively avoiding the phenomenon of arc discharge caused by the large deflection of the rotor outlet copper bar 625 due to the vibration of the ship's electric propulsion system, which shortens the insulation spacing between the two electrodes.

[0041] The lower end of the rotor base 67 adopts a double octagonal structure design. The outer octagonal structure can ensure the stable transmission of torque between it and the power compartment of the ship's electric propulsion system, and realize the synchronous operation of the high-power slip ring 6, the fluid slip ring 4, the signal slip ring 3 and the angle measurement module 1. The inner octagon provides a reliable installation reference for the fixed installation of the lower end of the rotor outlet copper bar 625, thereby improving the anti-vibration performance of the slip ring used in the ship's electric propulsion system.

[0042] The structure of high power junction box 64 is as follows Fig. 9 As shown, it includes a box body 641, a stuffing box 642, a current input copper bar 643, a support seat 644, a square tube bracket 645, a knife switch 646, and a box door 647. The box body 641 is formed by welding 45 steel and then machining. The box door 647 is installed on one side of the box body through 4 sets of hinges and is equipped with a hydraulic support rod to facilitate the opening and closing of the box door 647 and improve the maintainability of the slip ring for the ship electric propulsion system. The other side of the box door 647 is fixed to the On the box body 641, the anti-vibration ability of the box door 647 is improved. Multiple insulators 622 are arranged in the box body 641 to achieve insulation support for the conductive copper busbar. Multiple sets of knife switches 646 are arranged in the box body 641 to achieve manual disconnection of the loop. The current input copper busbar 643 is installed in the box body 641 in a staggered manner through the square tube bracket 645, the support seat 644, and the insulator 622, which is convenient for user wiring. The user line is connected through multiple stuffing boxes 642 on the side of the box body 641.

[0043] The current input copper busbar 643 is formed by bending a standard busbar multiple times, and the busbar recess is supported by an insulator 622, so that single-loop multi-strand cables can be connected.

[0044] The present invention provides a multi-layer nested slip ring for a 15MW ship electric propulsion system, which integrates power, signal, oil, and gas rotation transmission functions. The high-power slip ring 6 adopts a 15-loop stacking structure design, with a single-channel transmission voltage of 3.3kV and a single-channel transmission current of 1200A. The insulation spacing is ≥75mm, and it has the characteristics of high transmission power, strong vibration resistance, high reliability, and good maintainability.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0046] The above contents are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications may be made according to the present invention. Any modifications, equivalent substitutions and improvements made within the design principles of the present invention should be covered within the protection scope of the present invention.

Claims

1. A multi-layer nested slip ring for a 15MW ship electric propulsion system, characterized in that: The invention comprises an angle measurement module (1), a fluid slip ring interface box (2), a signal slip ring (3), a fluid slip ring (4), a fluid slip ring transmission shaft (5), and a high-power slip ring (6); the high-power slip ring (6) is connected to the hull; the main shaft of the fluid slip ring (4) and the main shaft of the signal slip ring (3) are connected to the rotating end of the high-power slip ring (6) via the fluid slip ring transmission shaft (5), and keep synchronous operation; the fluid slip ring interface box (2) is installed at the upper end of the high-power slip ring (6); and the angle measurement module (1) is installed above the fluid slip ring interface box (2), so as to realize accurate measurement of the rudder angle of the ship's electric propulsion system; The high-power slip ring (6) comprises a main frame (61), a ring plate assembly (62), a stacked insulator (63), a high-power junction box (64), a fluid slip ring drive shaft (65), a main load-bearing bearing (66), and a rotor base (67). The main frame (61) is connected to the hull, the rotor end of the main load-bearing bearing (66) is fixedly connected to the rotor base (67), and the stator end of the main load-bearing bearing (66) is fixedly connected to the main frame (61), thereby achieving a rotor base ( 67) slewing bearing; the fluid slip ring drive shaft (65) is connected to the rotor base (67); the rotor ring segments (624) of the ring segment assembly (62) are stacked and installed on the rotor base (67) using stacking insulators (63), and the stator ring segments (623) of the ring segment assembly (62) are installed on the stator ring segment pillars (618) through insulators (622); the high-power junction box (64) is wall-mounted on both sides of the main frame (61) to achieve connection with the user line.

2. A multi-layer nested slip ring for a 15MW ship electric propulsion system according to claim 1, characterized in that: The slip rings used in the ship electric propulsion system adopt a multi-layer nested structure design, which includes a high-power slip ring (6), a fluid slip ring (4), and a signal slip ring (3) from the outside to the inside.

3. A multi-layer nested slip ring for a 15MW ship electric propulsion system according to claim 1, characterized in that: The high-power slip ring (6) adopts a 15-loop stacking design, a multi-layer loop insulation spacing and a slip ring structure compact design, and the rotor outlet copper bar (625) adopts a double-layer octagonal distribution form and is installed on the rotor base (67) through an insulator (622).

4. The multi-layer nested slip ring for a 15MW ship electric propulsion system according to claim 1, characterized in that: The high-power slip ring (6) is provided with a blower (611), a heater (612), a ventilation grille (616) and a plurality of temperature and humidity sensors (613). The blower (611) and the heater (612) are wall-mounted at a lower position of a side cover plate of the main frame (61), the ventilation grille (616) is installed on the other side cover plate of the main frame (61), and the plurality of temperature and humidity sensors (613) are installed on the main frame (61) to monitor and feed back temperature and humidity indicators inside the slip ring in real time, and to control the operation of the heater and the blower to adjust the temperature and humidity inside the slip ring.

5. The multi-layer nested slip ring for a 15MW ship electric propulsion system according to claim 1, characterized in that: The angle measurement module (1) adopts a double rotary transformer redundant design.

6. The multi-layer nested slip ring for a 15MW ship electric propulsion system according to claim 1, characterized in that: The high-power junction box (64) is provided with a plurality of knife switches (646) to realize manual disconnection of the loop. One side of the box door (647) is supported by four sets of hinges and is equipped with a hydraulic support rod. The other side of the box door (647) is fixed to the box body (641) by slotted captive screws to improve the vibration resistance of the box body.

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