A magnetic levitation axial bearing assembly and system having the same

Abstract

The utility model relates to bearing equipment technical field, especially a kind of magnetic suspension axial bearing assembly and the system with it. Solve the size of thrust disc under the magnetic circuit design of existing too big, and further lead to its when high-speed operation produces huge centrifugal force, seriously affect the stability of rotor system and the problem of limit speed. Including: axial stator;Axial coil, the axial coil is set in the axial stator;Cover plate, set in the opening side of the embedding slot of axial coil and at least part of axial coil is covered, cover plate is fixedly connected with axial stator;And cover plate is made of magnetically conductive material, and axial stator is jointly constituted for the magnetic circuit for guiding the magnetic field generated by axial coil. Bearing system, including: thrust disc, the thrust disc is fixedly connected with main shaft;At least a pair of as described above magnetic suspension axial bearing assembly, the magnetic suspension axial bearing assembly is distributed in the axial both sides of the thrust disc and interval formation working air gap between the thrust disc.

Description

Technical Field

[0001] This utility model relates to the field of bearing equipment technology, and in particular to a magnetic levitation axial bearing assembly and a system having the same. Background Technology

[0002] Traditional mechanical bearings, such as rolling bearings and oil film bearings, rely on physical contact between components to support the rotor, which has a series of inherent drawbacks, including friction and wear, the need for lubrication, low speed limits, high vibration and noise, and frequent maintenance. To overcome these shortcomings, non-contact magnetic levitation bearing technology has emerged and has shown great potential in high-end equipment fields such as high-speed motors, centrifugal compressors, and precision instruments.

[0003] Magnetic levitation bearings suspend the rotor in the air through controllable electromagnetic force, achieving contactless support and fundamentally eliminating friction and wear. They have significant advantages such as high speed, high precision, no need for lubrication, and long service life.

[0004] However, magnetic levitation bearings, especially their core component, the axial bearing, still face challenges in structural design and performance optimization. The size of the thrust disk is a key factor. In existing magnetic circuit designs, a large-diameter thrust disk is often required to generate sufficient axial load. However, a large thrust disk generates enormous centrifugal stress during high-speed rotation. This not only places stringent requirements on the material strength of the thrust disk and its connected rotor but also affects the dynamic stability of the entire rotor system, limiting the bearing's application under ultra-high-speed conditions. Therefore, effectively reducing the thrust disk diameter while ensuring or even increasing axial load has become a key technical challenge for optimizing the performance of magnetic levitation axial bearings and expanding their application range. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic levitation axial bearing assembly and a system thereof, which solves the problem that the thrust disk size is too large under the existing magnetic circuit design, resulting in huge centrifugal force during high-speed operation, which seriously affects the stability and limit speed of the rotor system.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The first aspect of this utility model provides a magnetic levitation axial bearing assembly, comprising: Axial stator; An axial coil, wherein the axial coil is disposed within the axial stator; A cover plate is disposed on the opening side of the slot where the axial coil is located and at least partially covers the axial coil. The cover plate is fixedly connected to the axial stator. The cover plate is made of magnetically conductive material and together with the axial stator, forms a magnetic circuit for guiding the magnetic field generated by the axial coil.

[0007] Furthermore, the cover plate has an annular structure, extending radially outward and beyond the outer periphery of the axial coil.

[0008] Furthermore, the cover plate and the axial stator are fixedly connected by welding or bolting.

[0009] Furthermore, the cover plate covers the pole shoe end face of the axial stator in the axial direction.

[0010] The second aspect of this utility model provides a magnetic levitation axial bearing system, comprising: A thrust disk, which is fixedly connected to the main shaft; At least one pair of magnetically levitated axial bearing assemblies as described above, wherein the magnetically levitated axial bearing assemblies are distributed on both sides of the thrust disk and form a working air gap with the thrust disk.

[0011] Furthermore, the outer edge of the thrust disk is radially flush with the cover plate.

[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This invention relates to a magnetic levitation axial bearing assembly and a system thereof. By adding a magnetically conductive cover plate to one side of the axial stator, it forms a low-resistivity closed magnetic circuit together with the stator and thrust disk. This structure can more effectively guide and concentrate magnetic lines of force, significantly improving magnetic circuit efficiency and electromagnetic work capacity. Therefore, while generating the same axial levitation force, the outer diameter of the thrust disk can be significantly reduced. The reduction in the thrust disk size directly reduces the enormous centrifugal force generated during high-speed operation, thereby greatly improving the dynamic stability, mechanical reliability, and limiting speed of the rotor system.

[0013] Furthermore, in this invention, the cover plate covers the magnetic pole surface of the axial stator, providing an ideal magnetic conduction path for the magnetic lines of force, forcing the magnetic lines of force to concentrate through the working air gap and act on the effective area of ​​the thrust disk, which greatly reduces magnetic flux leakage and improves the energy conversion efficiency of the system.

[0014] Furthermore, the reduction in thrust disc size and the introduction of a cover plate make the entire magnetic levitation axial bearing system more compact in the radial direction. This not only reduces the system weight but also provides key technical support for the miniaturization and lightweight design of equipment such as high-speed motors and centrifugal compressors.

[0015] Furthermore, the component has a simple structure and can be reliably fixed to the stator through welding or bolting, resulting in good mechanical stability. The optimized magnetic circuit and reduced centrifugal load together improve the lifespan and reliability of the bearing and even the entire rotating machinery, making it more widely applicable under harsh conditions such as high speed and high power density. Attached Figure Description

[0016] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a cross-sectional structural diagram of a magnetic levitation axial bearing assembly in the prior art; Figure 2 This is a three-dimensional structural schematic diagram of the magnetic levitation axial bearing assembly provided by this utility model; Figure 3 This is a cross-sectional structural schematic diagram of the magnetic levitation axial bearing assembly provided by this utility model; The reference numerals in the attached figures are explained as follows: 1. Axial stator; 2. Axial coil; 3. Cover plate; 4. Thrust plate; 5. Spindle. Detailed Implementation

[0017] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] See Figures 1 to 3 This example provides a magnetic levitation axial bearing assembly and a system having the same.

[0019] The aforementioned magnetic levitation axial bearing assembly includes an axial stator 1, an axial coil 2, and a cover plate 3. The magnetic levitation axial bearing system includes a thrust disk 4 and at least one pair of magnetic levitation axial bearing assemblies as described above.

[0020] Specifically, the axial stator 1 is made of a magnetically conductive material, and the side of it closest to the thrust disk 4 forms a magnetic pole surface.

[0021] The axial stator 1 is provided with an annular slot for accommodating the axial coil 2. The axial coil 2 is an annular winding that is set in the slot and can generate an induced magnetic field around it when energized.

[0022] The innovation in this example lies in the addition of a cover plate 3. Cover plate 3 is also made of a magnetically conductive material and is positioned on the open side of the slot containing the axial coil 2, at least partially covering it. Preferably, cover plate 3 is an annular structure, fixedly connected to the axial stator 1 by welding or bolting. Thus, cover plate 3, together with the axial stator 1 and the thrust disk 4, forms a low-resistivity closed magnetic circuit, used to guide and optimize the magnetic field path generated by the axial coil 2.

[0023] After the above structural optimization, the transmission path of the magnetic field lines is clearly defined as follows: the magnetic flux is generated by the axial coil 2, passes through the axial stator 1, cover plate 3, working air gap, thrust disk 4, working air gap on the other side, and returns to the axial stator 1, finally forming a complete magnetic circuit closed loop.

[0024] In the radial dimension, the cover plate 3 extends outward beyond the outer periphery of the axial coil 2, thus providing a lower magnetic reluctance path for the magnetic lines of force. Furthermore, an appropriate gap is maintained between the radial inner edge of the cover plate 3 and the axial stator 1, which is larger than the working air gap between the axial stator 1 and the thrust disk 4. Based on the principle that magnetic lines of force tend to choose the path of least magnetic reluctance, this structure encourages more magnetic flux to be guided through the cover plate 3 to the outer edge region of the thrust disk 4, enhancing the magnetic effect on the edge of the thrust disk 4.

[0025] In the aforementioned magnetic levitation axial bearing system, the thrust disk 4 is made of magnetically conductive material and is used for fixed connection with the main shaft 5. The magnetic levitation axial bearing assemblies are symmetrically distributed on both sides of the thrust disk 4 along the axial direction and maintain a very small working air gap with the thrust disk 4.

[0026] The outer edge of the thrust disk 4 is flush with the cover plate 3 in the radial direction. This configuration ensures that the magnetic lines of force guided by the cover plate 3 can act fully on the effective area of ​​the thrust disk 4, thereby significantly reducing the diameter of the thrust disk 4 while providing the same axial magnetic force.

[0027] In summary, this invention, by introducing a cover plate, forms a highly efficient closed magnetic circuit together with the stator and thrust disk. This design allows the system to significantly reduce the diameter of the thrust disk while maintaining the same electromagnetic performance, thereby directly reducing the centrifugal force generated by the thrust disk during high-speed rotation. Ultimately, this improves the stability, reliability, and maximum operating speed of the entire rotor system, making it particularly suitable for equipment applications with stringent requirements for speed and size.

[0028] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnetic levitation axial bearing assembly, characterized in that, include: Axial stator (1); Axial coil (2), the axial coil (2) is disposed within the axial stator (1); Cover plate (3), the cover plate (3) is disposed on the opening side of the groove where the axial coil (2) is located and at least partially covers the axial coil (2), the cover plate (3) is fixedly connected to the axial stator (1); The cover plate (3) is made of magnetically conductive material and together with the axial stator (1) forms a magnetic circuit for guiding the magnetic field generated by the axial coil (2).

2. The magnetic levitation axial bearing assembly according to claim 1, characterized in that, The cover plate (3) has an annular structure and extends outward in the radial direction beyond the outer periphery of the axial coil (2).

3. The magnetic levitation axial bearing assembly according to claim 1, characterized in that, The cover plate (3) and the axial stator (1) are fixedly connected by welding or bolting.

4. The magnetic levitation axial bearing assembly according to claim 1, characterized in that, The cover plate (3) covers the magnetic pole surface of the axial stator (1) in the axial direction.

5. A magnetic levitation axial bearing system, characterized in that, include: Thrust disk (4), which is fixedly connected to the main shaft; At least one pair of magnetic levitation axial bearing assemblies as described in any one of claims 1 to 4, wherein the magnetic levitation axial bearing assemblies are distributed on both axial sides of the thrust disk (4) and form a working air gap with the thrust disk (4) at intervals.

6. The magnetic levitation axial bearing system according to claim 5, characterized in that, The outer edge of the thrust plate (4) is radially flush with the cover plate (3).

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