CN111439362B - A ring-shaped electric propeller supported by a magnetic fluid composite suspension bearing - Google Patents
A ring-shaped electric propeller supported by a magnetic fluid composite suspension bearing Download PDFInfo
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- CN111439362B CN111439362B CN202010342930.0A CN202010342930A CN111439362B CN 111439362 B CN111439362 B CN 111439362B CN 202010342930 A CN202010342930 A CN 202010342930A CN 111439362 B CN111439362 B CN 111439362B
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- propeller
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- suspension bearing
- pressure water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
- B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/15—Propellers having vibration damping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/18—Propellers with means for diminishing cavitation, e.g. supercavitation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/26—Blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/28—Other means for improving propeller efficiency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/22—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing
- B63H23/24—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing electric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
本发明涉及一种磁液复合悬浮轴承支撑的环形电力推进器，包括：壳体、轮缘式电机、磁液复合悬浮轴承系统和螺旋桨。本发明采用置于水中的永磁无刷电机直接带动无毂式螺旋桨转动，省去了中间的传动机构，转子和螺旋桨组件由磁液复合悬浮轴承系统支撑并将推力传递到电机和船体上，降低电机到螺旋桨之间的中间传动损耗，提高效率、简化推进系统结构、降低噪声和振动等。
The present invention relates to an annular electric propeller supported by a magnetic fluid composite suspension bearing, comprising: a housing, a rim-type motor, a magnetic fluid composite suspension bearing system and a propeller. The present invention adopts a permanent magnet brushless motor placed in water to directly drive the hubless propeller to rotate, eliminating the intermediate transmission mechanism, and the rotor and propeller assembly are supported by the magnetic fluid composite suspension bearing system and transmit the thrust to the motor and the hull, reducing the intermediate transmission loss between the motor and the propeller, improving efficiency, simplifying the propulsion system structure, reducing noise and vibration, etc.
Description
Technical Field
The invention belongs to the technical field of marine propellers in ship turbines, and particularly relates to an annular electric propeller supported by a magnetic liquid composite suspension bearing.
Background
With the development of electric propulsion technology, electric propulsion systems are increasingly applied to ships. The common electric propulsion system comprises a speed change gear box, a shaft system (comprising a shaft, a coupling, various bearings, a bearing seat, a stern tube seal), a propeller and the like, wherein the electric propulsion system is driven by a motor to rotate after the speed change gear box is decelerated, so that the forward or backward thrust of the ship is generated, as shown in figure 1. The propulsion mode has the following problems of complex structure, numerous parts, high failure rate, large occupied space and heavy weight, low propulsion efficiency, energy loss generated by meshing of gears through the transmission of the components such as gears, shafting and the like, high friction force and high friction power consumption, and the transmission links generate intermediate transmission loss, reduce the propulsion efficiency of the system, vibrate and cause noise due to meshing of the transmission gears, and generate turbulence after water flows through the shafting and the underwater appendage, the propellers rotate in the turbulence to generate excitation and cavitation, and the cavitation bursts to generate noise.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an annular electric propeller supported by a magnetic liquid composite suspension bearing, a permanent magnet brushless motor arranged in water is adopted to directly drive a hubless propeller to rotate, an intermediate transmission mechanism is omitted, a rotor and propeller component is supported by the magnetic liquid composite suspension bearing system and transmits thrust to a motor and a ship body, the intermediate transmission loss between the motor and the propeller is reduced, the efficiency is improved, the propulsion system structure is simplified, the noise and vibration are reduced, and the like.
In order to solve at least one of the above technical problems, the technical scheme adopted by the invention is as follows:
the annular electric propeller supported by the magnetic liquid composite suspension bearing is characterized by comprising a shell, a rim-type motor, a magnetic liquid composite suspension bearing system and a propeller, wherein,
The rim type motor comprises a stator assembly, a rotor assembly and end flanges, wherein the stator assembly and the rotor assembly are arranged in a shell, and the end flanges are respectively arranged at two ends of the shell;
The magnetic liquid composite suspension bearing system is positioned on the end face flange and comprises a rotor end plate, a thrust disc, a dynamic thrust ring and a static thrust ring, wherein the rotor end plate is connected with the rotor assembly and is provided with a first clearance channel between the rotor end plate and the end face flange, a first water channel communicated with the first clearance channel is arranged inside the rotor end plate, the thrust disc is fixed at the end part of the rotor end plate and is provided with a second clearance channel communicated with the first clearance channel between the thrust disc and the end face flange, the interior of the thrust disc is provided with a second water channel respectively communicated with the second clearance channel and the first water channel for water to flow through to form liquid suspension, the dynamic thrust ring is arranged on the inner wall of the thrust disc, and the static thrust ring is arranged on the outer wall of the end face flange corresponding to the position of the dynamic thrust ring and is used for generating magnetic repulsion to form magnetic suspension;
The propeller is connected to the rotor assembly.
Further, the rotor end plate is further provided with a radial high-pressure water cavity, and the radial high-pressure water cavity is respectively communicated with the first clearance channel and the first water channel and is used for generating radial high-pressure water flow.
Further, the thrust disc is further provided with an axial high-pressure water cavity and a water inlet, the axial high-pressure water cavity is respectively communicated with the second clearance channel and the second water channel and is used for generating axial high-pressure water flow, and the water inlet is communicated with the second water channel.
Further, the water inlet is connected with a high-pressure water pump.
Furthermore, the magnetic liquid composite suspension bearing system further comprises antifriction blocks, wherein the antifriction blocks are arranged on the outer wall of the end face flange.
Further, the stator assembly is fixed above the inner steps of the end flanges at the two ends, and the rotor assembly is positioned on the inner side of the stator assembly.
Further, the propeller is an integral propeller or a split propeller.
Furthermore, the dynamic thrust ring and the static thrust ring are permanent magnets or electromagnetic coils wrapped with corrosion-resistant and corrosion-resistant coatings, and homopolar are opposite to each other to generate magnetic repulsive force.
Further, the rim motor is a rim permanent magnet brushless motor.
The beneficial effects of the invention at least comprise:
1) The magnetic-hydraulic composite suspension bearing system supports the rotor assembly and the propeller to bear the weight and the thrust of the rotor assembly and the propeller, so that the rotor assembly and the propeller are in a suspension state in the rotating process, the friction force is reduced, the friction power consumption is reduced, and the propulsion efficiency is improved by the measures;
2) The noise vibration is reduced, namely, vibration and noise caused by meshing of gears of a gear box in the traditional propulsion type are eliminated because the rotor directly drives the propeller;
3) The electric power propulsion device has the advantages of simple structure, light weight, improved reliability and less space occupation in a cabin, eliminates intermediate transmission components such as a coupler, a gear box, a shafting, a sliding bearing, a bearing seat, a stern tube sealing system and the like which are inherent in the traditional electric power propulsion type, has simpler structure, higher reliability and greatly reduces the weight, and in addition, the space in the cabin is saved because the motor is arranged under water.
Drawings
Fig. 1 is a schematic diagram of a prior art electric propulsion system.
Fig. 2 is a schematic view of the annular electric propeller structure of the present invention.
Fig. 3 is a cross-sectional view taken along the direction C-C of fig. 2.
Fig. 4 is a schematic view of the structure of an integral propeller according to an embodiment of the present invention.
Fig. 5 is a schematic view of a split propeller structure according to an embodiment of the present invention.
Fig. 6 is an enlarged view of a portion of fig. 3, illustrating the structure of the magnetic fluid composite suspension bearing system.
The rotor assembly comprises a motor 1, a gear box 2, a shaft system 3, a propeller 4, a blade tip 401, a blade tip flange 402, blades 403, a rotor assembly 5, a left end face flange 6, a shell 7, a stator assembly 8, a right end face flange 9, a magnetic liquid composite suspension bearing system 10, a rotor end plate 11, a first clearance channel 111, a first water flow channel 112, a radial high-pressure water cavity 113, a thrust disc 12, a second clearance channel 121, a second water flow channel 122, an axial high-pressure water cavity 123, a water inlet 124, a dynamic thrust ring 13, a static thrust ring 14, a radial antifriction block 15 and an axial antifriction block 16.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the present invention will be further described in detail with reference to specific embodiments. The following examples are illustrative only and are not to be construed as limiting the invention. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product.
Fig. 2 is a schematic view of the structure of the annular electric propeller of the present invention, fig. 3 is a cross-sectional view taken along the direction C-C of fig. 2, and in combination with fig. 2 and 3, the annular electric propeller supported by the magnetic liquid composite suspension bearing of the present invention mainly comprises a housing, a rim type motor, a propeller and a magnetic liquid composite suspension bearing system.
The invention adopts the rim type permanent magnet brushless motor to replace the traditional separately excited three-phase asynchronous motor. The rim type motor mainly comprises a stator assembly, a rotor assembly, a shell and an end face flange. The motor stator assembly is composed of an iron core and a coil, the whole body is filled with sealing insulating glue, the sealing insulating glue is isolated from water and plays an insulating role, the rotor is filled with permanent magnets, the sealing insulating glue is filled with sealing insulating glue, water is prevented from entering the rotor to corrode the permanent magnets, the left end and the right end of the rotor are rotor end plates, and the rotor end plates and the rotor form a rotor assembly together. The stator iron core is pressed in a motor shell, the shell is a shell of the propeller, the left end and the right end of the shell are connected with end face flanges of the motor, the left end face flange and the right end face flange are respectively, the stator assembly is fixed above inner side steps of the end face flanges at the two ends, and the rotor assembly is positioned at the inner side of the stator assembly.
The rotor has large diameter, can accommodate the propeller, is fixed on the inner circle of the rotor assembly through the blade tips, is directly driven to rotate by the rotor, and does not need intermediate transmission links such as gears and the like, wherein the rotating speed of the motor is the rotating speed of the propeller. The motor stator generates a rotating magnetic field after being connected with a three-phase power supply, the permanent magnet in the motor rotor generates electromagnetic force under the action of the rotating magnetic field, and the rotor rotates and outputs moment to drive the propeller to rotate in water to generate thrust for pushing the ship.
The propeller is a metal propeller or a composite propeller. The number of propeller blades is determined based on the hydrodynamic performance calculation, and the number of blades may be 2,3, 4,5, 6, etc., and the specific number is not particularly limited.
Fig. 4 is a schematic view of an integral propeller structure according to an embodiment of the present invention, and referring to fig. 4, the propeller structure according to the embodiment is integral, and each blade is integrally connected to a rotor assembly through a common blade tip flange.
Fig. 5 is a schematic structural view of a split propeller according to an embodiment of the present invention, and referring to fig. 5, the propeller blades of the embodiment are split, each blade is fixed on the inner circle of the rotor assembly through a blade tip flange, supported by the rotor assembly and directly driven, and meanwhile, the split propeller is convenient to detach and replace.
It can be understood that no matter the integral propeller or the split propeller is a hub-free propeller without a hub, each blade is fixed on the rotor assembly through the blade tip flange and is directly driven by the rotor assembly, the motor rotating speed, namely the propeller rotating speed, does not need a shafting and a hub for supporting and driving, and does not need intermediate transmission links such as a transmission gear.
Fig. 6 is an enlarged view of a portion of fig. 3, and referring to fig. 6, the magnetic liquid composite suspension bearing system is located on the end flange, and is composed of a liquid suspension bearing system and a magnetic thrust bearing system.
The rotor end plate is connected with the rotor assembly and is provided with a first clearance channel between the rotor end plate and the end face flange, the rotor end plate is internally provided with a first water channel communicated with the first clearance channel, the thrust plate is fixed at the end part of the rotor end plate and is provided with a second clearance channel communicated with the first clearance channel between the rotor end plate and the end face flange, and the thrust plate is internally provided with a second water channel respectively communicated with the second clearance channel and the first water channel.
The rotor end plate is also provided with a radial high-pressure water cavity, and the radial high-pressure water cavity is respectively communicated with the first clearance channel and the first water flow channel and is used for generating radial high-pressure water flow.
The thrust disc is also provided with an axial high-pressure water cavity and a water inlet, the axial high-pressure water cavity is respectively communicated with the second clearance channel and the second water channel and is used for generating axial high-pressure water flow, and the water inlet is communicated with the second water channel.
The antifriction blocks are arranged on the outer wall of the end face flange and comprise radial antifriction blocks and axial antifriction blocks, wherein the radial antifriction blocks are positioned at the relative positions of the radial high-pressure water cavities, and the axial antifriction blocks are positioned at the relative positions of the axial high-pressure water cavities.
When the motor starts, the rotor assembly starts to rotate to drive the rotor end plate to rotate, and then the thrust disc connected with the rotor end plate rotates together, water at a water inlet of a second water flow channel in the thrust disc is sucked into the second water flow channel in the thrust disc, high-pressure water flow is formed under the acting of centrifugal force along with the high-speed rotation of the thrust disc and the rotor assembly, the high-pressure water flow is guided into radial high-pressure water cavities in the thrust disc and the rotor end plate through a waterway (in the direction indicated by an arrow), the water flow speed is reduced, the water pressure is increased, a local high-pressure water area is formed between the radial high-pressure water cavities and the inner circular surface of a matched motor end flange, the water pressure thrust F1 acts on the inner circular surface of the end flange to form supporting force for supporting the rotor assembly, the gravity of the rotor assembly is overcome, the rotor assembly is supported up, the rotor assembly is not contacted with the stator assembly, the rotor assembly is in a suspension state, the sliding friction force is greatly reduced, and the noise is reduced.
When the motor starts to accelerate and stop to decelerate, the centrifugal force is weakened, the supporting force generated by high-pressure water pressure is insufficient to overcome the gravity of the rotor assembly and the propeller, at the moment, the rotor end plate is in contact with the radial antifriction blocks on the end face flange and is in a sliding friction state, the direct friction pair is in a low-resistance friction state due to the low friction coefficient and the low wear rate of the antifriction blocks, and the reliable operation of the propeller in a low-speed state is ensured. The high-pressure water can be generated by centrifugal force caused by high-speed rotation of the rotor assembly, and can be directly pumped by a high-pressure water pump externally connected with a water inlet.
The magnetic thrust bearing system consists of a movable thrust ring arranged in a thrust disc and a static thrust ring arranged in an end face flange corresponding to the position of the movable thrust ring, so that a dynamic and static thrust bearing pair is formed, the movable thrust ring and the static thrust ring are permanent magnets or electromagnetic coils wrapped with corrosion-resistant and corrosion-resistant coatings, and homopolar opposition is realized, so that magnetic repulsive force is generated.
The working principle of the magnetic thrust bearing system is that in the running process of the motor, the propeller drives the rotor assembly and the thrust disc to rotate together, and the propeller pushes the rotor and the thrust disc to move forward (left in the figure) in the direction of the end face flange, so that the gap between the thrust disc and the end face flange is reduced. With the smaller and smaller gap, the magnetic repulsive force F2 generated between the magnets or between the magnets and the coil is larger and larger, and finally, the thrust of the motor is balanced with that of the propeller, the dynamic thrust ring and the static thrust ring keep a certain gap and are in a non-contact suspension state, so that direct sliding friction between the thrust disc and the motor end face flange is avoided, and heating and abrasion are greatly reduced.
As shown in fig. 6, the high-pressure water flow generated by the high-speed rotation may be introduced into the high-pressure water chamber in the axial direction of the thrust disk, the flow velocity is reduced, the water pressure is increased, and the high-pressure water generates a water pressure thrust F1 toward both sides in the gap between the high-pressure water chamber in the axial direction and the end flange. When the propeller thrust pushes the thrust disc to move towards the end face flange, the gap between the thrust disc and the end face flange axial high-pressure water cavity is reduced, the water flow speed is lower, the water pressure is higher, the thrust disc is prevented from continuing to approach towards the end face flange, the sum of the final water pressure thrust and the magnetic thrust (namely the magnetic repulsive force F2) is balanced with the propeller thrust, the thrust disc stops moving towards the end face flange, a certain gap is kept, and the thrust disc and the end face flange are in a non-contact suspension state. The hydraulic thrust generated by the hydraulic force shares part of the axial load of the magnetic thrust bearing, forms resultant force with the magnetic thrust, and jointly counteracts the thrust of the propeller, so that the thrust bearing pair is in a suspension state, namely, the principle of suspending the thrust bearing pair by the hydraulic force is adopted. The invention uses the magnetic liquid composite suspension bearing system generated by centrifugal force and magnetic force, plays the roles of thrust and radial bearing, eliminates the direct friction between the thrust bearing pair and the radial bearing pair, ensures that the bearing is not worn any more, greatly prolongs the service life and the reliability of the bearing, and solves the problem of bearing wear of the rim motor in water.
The liquid suspension bearing system and the magnetic thrust bearing system form a magnetic liquid composite suspension bearing pair together, support the gravity of the rotor assembly and the propeller and bear the thrust of the propeller. The magnetic liquid composite suspension bearing pair is usually positioned at one side of the rotor, but not at two ends of the rotor, and the structure ensures that the bearing pair can be arranged on the same part, so that continuous processing is convenient during processing, coaxiality between the bearing pairs is ensured, and meanwhile, the processing efficiency is improved and the manufacturing cost is reduced. When the thrust of the propeller for backing is needed to be borne, the other end of the rotor can be provided with a magnetic liquid composite suspension bearing system, namely, both ends of the rotor are provided with the magnetic liquid composite suspension bearing system.
In summary, the invention improves the propulsion efficiency by adopting a permanent magnet brushless motor and using a permanent magnet to replace a coil, compared with the traditional separately excited motor, reduces current loss, improves motor efficiency and power factor, directly fixes a propeller on the inner circle of a rotor of the motor, directly drives the propeller to rotate without any intermediate transmission link, eliminates loss caused by the intermediate transmission link, and thirdly, supports a rotor assembly and the propeller to bear weight and thrust force of the rotor assembly and the propeller, so that the rotor assembly and the propeller are in a suspension state in the rotating process, reduces friction force, reduces friction power consumption, improves the propulsion efficiency by adopting the measures, reduces noise vibration by directly driving the propeller by the rotor, eliminates vibration and noise caused by gear meshing of a gear box in a traditional propulsion mode, greatly reduces friction noise and vibration by adopting a non-contact mode magnetic suspension bearing system in the running of the propeller, reduces noise vibration by adopting the factors, reduces the structure, lightens weight, improves reliability, occupies less space, and reduces the weight and the inherent space of a traditional electric propulsion gear box, a shaft system, a sliding bearing and a propeller shaft system, a water-sealing system and the like, and the invention has the advantages of saving the weight and the structure is more simple and the like.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art within the scope of the application, as well as variations in the detailed description and application of the application may occur to those skilled in the art in light of the teachings of the application.
Claims (7)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111927790A (en) * | 2020-09-07 | 2020-11-13 | 薛峰 | Shaftless submersible axial flow electric pump |
| CN114635920B (en) * | 2020-12-15 | 2024-07-02 | 中国科学院宁波材料技术与工程研究所 | Suspended bearing, control method and application thereof |
| CN114348225B (en) * | 2021-12-22 | 2022-11-18 | 中国人民解放军海军工程大学 | Shaftless side thruster and flow channel system for vibration and noise reduction |
| CN114524074A (en) * | 2022-02-15 | 2022-05-24 | 武汉理工大学 | Rim-driven propeller of magnetic suspension permanent magnet motor |
| CN114548440B (en) * | 2022-02-24 | 2024-06-25 | 成都秦川物联网科技股份有限公司 | Natural gas station equipment overhaul maintenance management system and method based on Internet of things |
| NL2031469B1 (en) * | 2022-03-31 | 2023-10-24 | Insumo B V | Rim driven thruster and method for propelling a ship |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212354371U (en) * | 2020-04-27 | 2021-01-15 | 广州海工船舶设备有限公司 | Annular electric propeller supported by magnetic-liquid composite suspension bearing |
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| JPH0833268A (en) * | 1994-07-19 | 1996-02-02 | Toshiba Corp | Axial gap motor and scanner motor for driving polygon mirror |
| CN108891571A (en) * | 2018-07-26 | 2018-11-27 | 沈阳化工大学 | A kind of shaftless electromagnetic propeller of magnetic suspension |
| CN108974308A (en) * | 2018-09-05 | 2018-12-11 | 宁波捷茂船舶技术有限公司 | A kind of novel shaftless electric propulsion device |
| WO2020070753A1 (en) * | 2018-10-02 | 2020-04-09 | Harshad Babulal Patel | An improved magnetic levitation system for flying vehicle |
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| CN212354371U (en) * | 2020-04-27 | 2021-01-15 | 广州海工船舶设备有限公司 | Annular electric propeller supported by magnetic-liquid composite suspension bearing |
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