Marine permanent magnet thrust bearing device

Abstract

The invention discloses a marine permanent magnet thrust bearing device which comprises a thrust shaft, and flange assemblies are arranged at the two ends of the thrust shaft. And the permanent magnet module assembly is arranged on the thrust shaft in a sleeving mode, and the permanent magnet module assembly generates a magnetic field and is used for preventing axial movement of the thrust shaft. According to the permanent magnet module assembly, a multi-layer nested permanent magnet stator assembly and a multi-layer nested permanent magnet rotor assembly are stacked in a crossed mode to form a crossed and stacked permanent magnet arrangement structure, a hybrid Halbach array magnetized magnetic circuit design structure is adopted to generate a magnetic field, and when the thrust shaft axially moves, the thrust shaft is driven to rotate by the magnetic circuit design structure. The multi-layer nested permanent magnet stator assembly and the multi-layer nested permanent magnet rotor assembly generate magnetic force for preventing the thrust shaft from moving. The single-layer permanent magnet rotor assembly and the single-layer permanent magnet stator assembly achieve radial suspension through magnetic force to form an air gap, the stator assembly and the rotor assembly are not in physical contact, the friction loss of the thrust bearing under the working conditions of starting and stopping, large thrust, high rotating speed and the like is reduced, the vibration isolation performance of the thrust bearing is improved, and the service life of the thrust bearing is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship propulsion, and in particular relates to a permanent magnetic thrust bearing device for a ship. Background Art

[0002] The ship propulsion system is an important part of the ship's power system, and the thrust bearing is one of the core components of the ship's propulsion system. It will withstand the thrust or pull of the propeller and transmit it to the hull, pushing the ship forward or backward.

[0003] When bearing axial loads, thrust bearings inevitably transmit longitudinal vibrations, which in turn induce hull vibrations and generate underwater radiated noise. To ensure the acoustic stealth performance requirements of ship propulsion systems, in-depth research into longitudinal vibration reduction technology for thrust bearings is necessary. While the radiated noise of marine thrust bearings has been decreasing year by year with advancements in research and development technology, some performance improvements still fall short of actual requirements. New technologies, such as magnetic transmission, are urgently needed to further enhance the overall performance of thrust bearings. Existing thrust bearings, which transmit thrust through the magnetic field between a permanent magnet rotor assembly and a stator assembly, have proven to have excellent vibration isolation performance. However, significant issues remain, such as large axial displacement and a low thrust-to-weight ratio. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a marine permanent magnet thrust bearing device with a multi-layer nested structure, which can significantly improve the magnetic field utilization rate, enhance the thrust-to-weight ratio of the permanent magnet thrust bearing, and reduce the axial displacement of the permanent magnet thrust bearing, and can be applied to the silent working conditions of the ship propulsion system.

[0005] The object of the present invention is achieved through the following technical solutions: a marine permanent magnetic thrust bearing device, comprising:

[0006] The thrust shaft is provided with flange assemblies at both ends.

[0007] The permanent magnet module assembly is sleeved on the thrust shaft and generates a magnetic field to prevent the thrust shaft from moving axially.

[0008] Preferably, the permanent magnet module assembly comprises:

[0009] The box assembly is fixed around the thrust shaft and is hollow inside.

[0010] The permanent magnet assembly includes a permanent magnet stator assembly and a permanent magnet rotor assembly arranged at intervals. The permanent magnet assembly is arranged in the hollow space inside the box assembly. The magnetic blocks arranged on the permanent magnet stator assembly and the permanent magnet rotor assembly generate magnetic force to achieve radial suspension to form an air gap.

[0011] Preferably, the inner layer of the permanent magnet assembly is connected to the thrust shaft via a flat key, and the outer layer is connected to the box assembly via a flat key.

[0012] Preferably, both ends of the box assembly are connected to a shell assembly, the shell assembly is arranged to wrap around the thrust shaft, and a sealing assembly is provided between the shell assembly and the flange assembly.

[0013] Preferably, a radially centering bearing assembly is provided on the thrust shaft inside the housing assembly.

[0014] Preferably, an oil-slinging pan assembly is provided on the thrust shaft; an oil pan is provided at the lower portion of the housing assembly, and a cooler is provided in the oil pan.

[0015] Preferably, the permanent magnet stator assembly comprises:

[0016] The permanent magnet stator assembly magnetic block retaining frame is a hollow cylindrical structure, on which multiple turns of permanent magnet stator assembly magnetic block retaining blocks are axially arranged.

[0017] The permanent magnet stator assembly magnetic block holding block is arranged on the permanent magnet stator assembly magnetic sleeve holding frame. The permanent magnet stator assembly magnetic block holding block is arc-shaped and is provided with a clamping groove.

[0018] A plurality of permanent magnet stator assembly magnetic blocks are arranged in the slots on the permanent magnet stator assembly magnetic block holding block.

[0019] A plurality of permanent magnet stator assembly magnetic block retaining blocks are fixed on the permanent magnet stator assembly magnetic block retaining frame to form a circle of permanent magnet stator assembly magnetic block retaining blocks.

[0020] Preferably, the permanent magnet rotor assembly comprises:

[0021] The permanent magnet rotor assembly magnetic block retaining frame is a hollow cylindrical structure, on which multiple circles of permanent magnet rotor assembly magnetic block retaining blocks are axially arranged.

[0022] The permanent magnet rotor assembly magnetic block holding block is arranged on the permanent magnet rotor assembly magnetic sleeve holding frame. The permanent magnet rotor assembly magnetic block holding block is arc-shaped and is provided with a clamping groove.

[0023] A plurality of permanent magnet rotor assembly magnetic blocks are arranged in the clamping grooves on the permanent magnet rotor assembly magnetic block holding block.

[0024] A plurality of permanent magnet rotor assembly magnetic block retaining blocks are fixed on the permanent magnet rotor assembly magnetic block retaining frame to form a circle of permanent magnet rotor assembly magnetic block retaining blocks.

[0025] Preferably, the permanent magnet stator assembly magnetic blocks and the permanent magnet rotor assembly magnetic blocks adopt a magnetic circuit design structure of hybrid Halbach array magnetization.

[0026] Preferably, the box assembly is provided with multiple layers of nested and spaced permanent magnet stator assemblies and permanent magnet rotor assemblies.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] The present invention provides a marine permanent magnet thrust bearing device with a multi-layer nested structure. By cross-stacking multi-layer nested permanent magnet stator assemblies and multi-layer nested permanent magnet rotor assemblies, an eight-layer nested five-pole cross-stacked permanent magnet arrangement structure is formed. A magnetic circuit design structure employing hybrid Halbach array magnetization is used to generate a magnetic field. When the thrust shaft undergoes axial movement, the multi-layer nested permanent magnet stator assemblies and the multi-layer nested permanent magnet rotor assemblies generate a magnetic force that prevents the thrust shaft from moving. A single-layer permanent magnet rotor assembly is adjacent to a single-layer permanent magnet stator assembly, achieving radial suspension through magnetic force to form an air gap. The stator and rotor assemblies are free of physical contact, reducing friction losses during start-up and shutdown, high-thrust, and high-speed operating conditions, improving the thrust bearing's vibration isolation performance, and extending the thrust bearing's service life. This solution can significantly improve magnetic field utilization, enhance the thrust-to-weight ratio of the permanent magnet thrust bearing, and reduce axial displacement of the permanent magnet thrust bearing. It is suitable for high-thrust permanent magnet thrust bearing devices operating under silent conditions in marine propulsion systems.

[0029] The magnets used in the present invention are standard magnets of the same specifications. Standard magnets usually conform to universal size and specification standards, so they can match the design and assembly processes of various devices or systems, improving the versatility and compatibility of components. Standard magnets are easy to replace and exchange and can be used in different devices or systems, thereby simplifying the maintenance and repair process, reducing maintenance costs and improving the reliability of the equipment. Standard magnets comply with relevant industry standards and quality certifications, so they have a high quality assurance, can ensure stable performance, strong durability, and traceability of the production process. The use of standard magnets can simplify the design and engineering process, because their standardized sizes and specifications can be more easily assembled and matched with other components, reducing the complexity of customization and adaptation.

[0030] In the present invention, the stator assembly and the rotor assembly are composed of a magnet retaining block with an embedded standard magnet block installed in a magnetic sleeve retaining frame. The magnet is axially fixed by clamping the two retaining blocks to ensure that it will not move or fall off accidentally during operation. At the same time, the slot provided on the retaining block plays a vital role. It can effectively fix the radial position of the magnet block, and withstand and balance the radial force and axial force to prevent the displacement or shaking of the magnet position. The design of this structure is not only to ensure that the position of the magnet is stable, but also to withstand various forces and pressures from the external environment or working conditions, ensuring that the magnet can work normally under various circumstances. The axial pressure borne by the retaining block ensures the stability of the magnet in the axial direction, while the slot bears force in the radial direction to ensure that the magnet will not be moved or misplaced due to external influences. Through such a structural design, the magnet can be firmly fixed in the set position, maintaining its stability and reliability, thereby ensuring the normal operation and performance of the entire system.

[0031] Compared with conventional permanent magnet arrangements, the multi-layer nested structure of the present invention significantly improves magnetic field utilization and enhances the thrust-to-weight ratio of permanent magnetic thrust bearings. The maximum axial displacement can be controlled to within 5 mm, resolving the prominent issues of existing permanent magnetic thrust bearings, such as large axial displacement and low thrust-to-weight ratio.

[0032] The present invention utilizes a hybrid Halbach array magnetization method, employing a combination of Halbach array magnetization and radial magnetization to design the magnetic circuit. Halbach magnetization is performed on the outermost and innermost magnetic rings of the bearing, minimizing or even eliminating the magnetic flux of the outermost ring outward and the innermost ring toward the axis. The remaining magnetic rings are then radially magnetized, increasing bearing thrust. This effectively addresses magnetic flux leakage, enhances the bearing's magnetic shielding performance, improves the energy efficiency of the radial magnetization field, reduces the amount of magnetic material, lowers material costs, and reduces the size of the device.

[0033] In the present invention, when the thrust load increases, the thrust bearing capacity can be increased by axially adding modular permanent magnetic thrust assemblies based on the structural characteristics of the modular permanent magnetic thrust assembly. This increases the load capacity while retaining the radial force bearing structure at both ends. The weight of the permanent magnetic thrust bearing increases linearly with the increase in the load-bearing thrust. As the load-bearing thrust increases, the weight of the permanent magnetic thrust bearing increases at a slower rate than that of a traditional thrust bearing. In the field of high-thrust thrust bearings, the use of permanent magnetic thrust bearings offers a weight advantage over traditional thrust bearings, meeting lightweight requirements.

[0034] In the present invention, the radially self-aligning bearing assemblies on both sides have a self-aligning function, and the spherical support bearing structure adopted by the bearing and the bearing seat enables the bearing to have the ability of automatic self-alignment under the condition of ensuring the load-bearing capacity. In the case of changes in the deflection of the shafting caused by hull deformation, the spherical structure can adapt to the changes in the shafting, so that the shafting and the bearing mating surfaces always remain parallel, and the load is evenly distributed, thereby reducing the situation of excessive local wear of the bearing and improving the life of the bearing. The bearing adopts a single oil wedge, which has a simple structure, is easy to generate a dynamic pressure oil film, and has low friction loss. The bearing adopts a symmetrical layout of upper and lower bearings, and the lubricating oil enters the interior of the bearing from the oil inlet holes on both sides of the bearing for lubrication and cooling. While ensuring the performance of the bearing, the upper and lower bearings are interchangeable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the structure of a permanent magnetic thrust bearing device in an embodiment of the present invention;

[0036] Figure 2 Schematic diagram of a single-layer permanent magnet stator assembly according to an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of a single-layer permanent magnet rotor assembly in an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of magnet polarity in an embodiment of the present invention.

[0039] In the figure, 1 is the flange assembly; 2 is the thrust shaft; 3 is the sealing assembly; 4 is the housing assembly; 5 is the radial self-aligning bearing assembly; 6 is the oil-slinging plate assembly; 7 is the box assembly; 8 is the first flat key; 9 is the permanent magnet stator assembly; 10 is the permanent magnet rotor assembly; 11 is the second flat key; 12 is the cooler; 9-1 is the magnetic sleeve retaining frame of the single-layer permanent magnet stator assembly; 9-2 is the magnet retaining block of the single-layer permanent magnet stator assembly; 9-3 is the magnetic block of the single-layer permanent magnet stator assembly; 10-1 is the magnetic sleeve retaining frame of the single-layer permanent magnet rotor assembly; 10-2 is the magnet retaining block of the single-layer permanent magnet rotor assembly; 10-3 is the magnetic block of the single-layer permanent magnet rotor assembly. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The technical solution of the present invention provides a marine permanent magnetic thrust bearing device, comprising:

[0042] The thrust shaft 2 is provided with flange assemblies 1 at both ends;

[0043] The permanent magnet module assembly is sleeved on the thrust shaft 2 , and the permanent magnet module assembly generates a magnetic field to prevent the thrust shaft 2 from moving axially.

[0044] like Figure 1 As shown, in one embodiment of the present invention, the permanent magnet module assembly includes:

[0045] The box assembly 7 is fixed around the thrust shaft 2 and is hollow inside;

[0046] The permanent magnet assembly includes a permanent magnet stator assembly 9 and a permanent magnet rotor assembly 10 arranged at intervals. The permanent magnet assembly is arranged in the hollow space inside the box assembly 7. The magnetic blocks arranged on the permanent magnet stator assembly 9 and the permanent magnet rotor assembly 10 generate magnetic force to achieve radial suspension and form an air gap.

[0047] In one embodiment of the present invention, the inner layer of the permanent magnet assembly is connected to the thrust shaft 2 via a flat key, and the outer layer is connected to the box assembly 7 via a flat key.

[0048] In one embodiment of the present invention, both ends of the box assembly 7 are connected to the shell assembly 4 , the shell assembly 4 is arranged to wrap around the thrust shaft 2 , and a sealing assembly 3 is arranged between the shell assembly 4 and the flange assembly 1 .

[0049] In one embodiment of the present invention, radially aligning bearing bush assemblies 5 are provided on the thrust shaft 2 in the housing assembly 4. The radially aligning bearing bush assemblies on both sides have a centering function.

[0050] In one embodiment of the present invention, an oil-slinging pan assembly 6 is provided on the thrust shaft 2 ; an oil pan is provided at the lower portion of the housing assembly 4 , and a cooler 12 is provided in the oil pan.

[0051] like Figure 2 As shown, in one embodiment of the present invention, the permanent magnet stator assembly 9 includes:

[0052] The permanent magnet stator assembly magnetic block holder 9-1 is a hollow cylindrical structure, on which multiple turns of permanent magnet stator assembly magnetic block holders 9-2 are axially arranged;

[0053] The permanent magnet stator assembly magnetic block holding block 9-2 is arranged on the permanent magnet stator assembly magnetic sleeve holding frame 9-1. The permanent magnet stator assembly magnetic block holding block 9-2 is arc-shaped and has a card slot thereon;

[0054] A plurality of permanent magnet stator assembly magnetic blocks 9-3 are arranged in the slots on the permanent magnet stator assembly magnetic block holding block 9-2;

[0055] A plurality of permanent magnet stator assembly magnetic block retaining blocks 9-2 are fixed on the permanent magnet stator assembly magnetic block retaining frame 9-1, forming a circle of permanent magnet stator assembly magnetic block retaining blocks.

[0056] like Figure 3 As shown, in one embodiment of the present invention, the permanent magnet rotor assembly includes:

[0057] The permanent magnet rotor assembly magnetic block holder 10-1 is a hollow cylindrical structure, on which multiple circles of permanent magnet rotor assembly magnetic block holders 10-2 are axially arranged;

[0058] The permanent magnet rotor assembly magnetic block holding block 10-2 is arranged on the permanent magnet rotor assembly magnetic sleeve holding frame 10-1. The permanent magnet rotor assembly magnetic block holding block 10-2 is arc-shaped and has a card slot.

[0059] A plurality of permanent magnet rotor assembly magnetic blocks 10 - 3 are arranged in the slots on the permanent magnet rotor assembly magnetic block holding block 10 - 2 ;

[0060] A plurality of permanent magnet rotor assembly magnetic block retaining blocks 10-2 are fixed on the permanent magnet rotor assembly magnetic block retaining frame 10-1, forming a circle of permanent magnet rotor assembly magnetic block retaining blocks. In the above embodiment, the single-layer permanent magnet stator assembly has the same structural type as the single-layer permanent magnet rotor assembly. Four magnetic blocks are installed in a magnet retaining block slot, and three arc-shaped magnet retaining blocks constitute a group of full-circle magnet retaining blocks. Five groups of full-circle magnet retaining blocks are arranged axially and installed together in the magnetic sleeve retaining frame to form a single-layer permanent magnet stator assembly or a single-layer permanent magnet rotor assembly. In this embodiment, the magnets are standard magnetic blocks of the same specifications, and the stator assembly and the rotor assembly are composed of magnet retaining blocks with embedded standard magnetic blocks installed in the magnetic sleeve retaining frame.

[0061] As a further optimization of the above embodiment, the box assembly 7, the multi-layer nested permanent magnet stator assembly, and the multi-layer nested permanent magnet rotor assembly together constitute a modular structure of the permanent magnet assembly. When a longer thrust shaft 2 is used, multiple groups of modular structures of permanent magnet assemblies can be arranged along the axial direction.

[0062] In one embodiment of the present invention, the permanent magnet stator assembly magnetic block 9 - 3 and the permanent magnet rotor assembly magnetic block 10 - 3 adopt a magnetic circuit design structure of hybrid Halbach array magnetization.

[0063] In one embodiment of the present invention, a box assembly 7 is provided with a multi-layered, nested, and spaced-apart permanent magnet stator assembly 9 and a permanent magnet rotor assembly 10. In this embodiment, the multi-layered nested permanent magnet stator assembly and the multi-layered nested permanent magnet rotor assembly are composed of four layers of single-layer permanent magnet stator assemblies and four layers of single-layer permanent magnet rotor assemblies, respectively. The single-layer permanent magnet rotor assemblies are adjacent to the single-layer permanent magnet stator assemblies and are radially suspended by magnetic force to form an air gap. The multi-layer nested permanent magnet rotor assembly 10 and the multi-layer nested permanent magnet stator assembly 11 are arranged crosswise, and the single-layer permanent magnet rotor assembly is adjacent to the single-layer permanent magnet stator assembly. Radial suspension is achieved by magnetic force to form an air gap. The multi-layer nested permanent magnet rotor assembly 10 and the multi-layer nested permanent magnet stator assembly constitute a permanent magnet assembly 11 as a whole, which is connected to the thrust shaft 2 at the inner layer through the flat key Ⅰ8 and connected to the shell assembly 4 at the outer layer through the flat key Ⅱ11. The two ends of the shell assembly 4 are connected to the box assembly 7. The shell assembly 4 is arranged with a radially aligning bearing assembly 5, an oil-slinging plate assembly 6 and a cooler assembly 12. The radially aligning bearing assembly 5 and the oil-slinging plate assembly 6 are installed on the thrust shaft 2, and the cooler assembly 12 is installed on the lower oil pan of the shell assembly 4. The outer side of the shell assembly 4 is connected to the sealing assembly 3, and the flange 1 is connected to the two ends of the shaft 2.

[0064] The marine permanent magnet thrust bearing device provided in embodiments of the present invention significantly improves magnetic field utilization, enhances the thrust-to-weight ratio of the permanent magnet thrust bearing, and reduces axial displacement of the permanent magnet thrust bearing. Based on an eight-layer nested, five-pole cross-stacked permanent magnet arrangement, this device addresses prominent issues such as large axial displacement and low thrust-to-weight ratio in permanent magnet thrust bearings. This device is suitable for high-thrust permanent magnet thrust bearings operating in silent conditions in marine propulsion systems.

[0065] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A marine permanent magnetic thrust bearing device, characterized in that: The thrust bearing device comprises: A thrust shaft (2) is provided with flange assemblies (1) at both ends; A permanent magnet module assembly is sleeved on the thrust shaft (2), and the permanent magnet module assembly generates a magnetic field for preventing the thrust shaft (2) from moving axially.

2. A marine permanent magnetic thrust bearing device according to claim 1, characterized in that: The permanent magnet module assembly comprises: A box assembly (7) is fixed around the thrust shaft (2) and is hollow inside; A permanent magnet assembly comprises a permanent magnet stator assembly (9) and a permanent magnet rotor assembly (10) arranged at intervals. The permanent magnet assembly is arranged in the hollow space inside the box assembly (7). Magnetic blocks arranged on the permanent magnet stator assembly (9) and the permanent magnet rotor assembly (10) generate magnetic force to achieve radial suspension and form an air gap.

3. A marine permanent magnetic thrust bearing device according to claim 2, characterized in that: The inner layer of the permanent magnet assembly is connected to the thrust shaft (2) via a flat key, and the outer layer is connected to the box assembly (7) via a flat key.

4. A marine permanent magnetic thrust bearing device according to claim 3, characterized in that: Both ends of the box assembly (7) are connected to a shell assembly (4), the shell assembly (4) is arranged to wrap around the thrust shaft (2), and a sealing assembly (3) is arranged between the shell assembly (4) and the flange assembly (1).

5. A marine permanent magnetic thrust bearing device according to claim 4, characterized in that: A radial centering bearing bush assembly (5) is provided on the thrust shaft (2) in the housing assembly (4).

6. A marine permanent magnetic thrust bearing device according to claim 5, characterized in that: An oil-slinging pan assembly (6) is provided on the thrust shaft (2); an oil pan is provided at the lower portion of the housing assembly (4), and a cooler (12) is provided in the oil pan.

7. A marine permanent magnetic thrust bearing device according to claim 2, characterized in that: The permanent magnet stator assembly (9) comprises: The permanent magnet stator assembly magnetic block retaining frame (9-1) is a hollow cylindrical structure, on which multiple turns of permanent magnet stator assembly magnetic block retaining blocks (9-2) are axially arranged; A permanent magnet stator assembly magnetic block holding block (9-2) is arranged on the permanent magnet stator assembly magnetic sleeve holding frame (9-1); the permanent magnet stator assembly magnetic block holding block (9-2) is arc-shaped and is provided with a clamping groove; A plurality of permanent magnet stator assembly magnetic blocks (9-3) are arranged in the slots on the permanent magnet stator assembly magnetic block holding block (9-2); A plurality of permanent magnet stator assembly magnetic block retaining blocks (9-2) are fixed on the permanent magnet stator assembly magnetic block retaining frame (9-1) to form a circle of permanent magnet stator assembly magnetic block retaining blocks.

8. A marine permanent magnetic thrust bearing device according to claim 7, characterized in that: The permanent magnet rotor assembly comprises: The permanent magnet rotor assembly magnetic block retaining frame (10-1) is a hollow cylindrical structure, on which a plurality of circles of permanent magnet rotor assembly magnetic block retaining blocks (10-2) are axially arranged; A permanent magnet rotor assembly magnetic block holding block (10-2) is arranged on the permanent magnet rotor assembly magnetic sleeve holding frame (10-1); the permanent magnet rotor assembly magnetic block holding block (10-2) is arc-shaped and is provided with a clamping groove; A plurality of permanent magnet rotor assembly magnetic blocks (10-3) are arranged in the slots on the permanent magnet rotor assembly magnetic block holding block (10-2); A plurality of permanent magnet rotor assembly magnetic block retaining blocks (10-2) are fixed on the permanent magnet rotor assembly magnetic block retaining frame (10-1) to form a circle of permanent magnet rotor assembly magnetic block retaining blocks.

9. A marine permanent magnetic thrust bearing device according to claim 8, characterized in that: The permanent magnet stator assembly magnetic block (9-3) and the permanent magnet rotor assembly magnetic block (10-3) adopt a magnetic circuit design structure of hybrid Halbach array magnetization.

10. A marine permanent magnetic thrust bearing device according to claim 9, characterized in that: The box assembly (7) is provided with the permanent magnet stator assembly (9) and the permanent magnet rotor assembly (10) which are nested in multiple layers and arranged at intervals.

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