Magnetic suspension structure and fan

Abstract

The invention relates to a magnetic suspension structure and a fan. The magnetic suspension structure comprises a permanent magnet biased magnetic bearing and a rotor shaft. The permanent magnet biased magnetic bearing comprises an axial magnetic suspension bearing and a radial magnet conduction ring arranged on one side of the axial magnetic suspension bearing, and the axial magnetic suspension bearing is connected with the magnet conduction ring through a permanent magnet. A radial stator iron core is arranged in a circular ring of the radial magnet conduction ring, and a conic hole is formed in the center of the radial stator iron core. The magnetic suspension structure further comprises a radial rotor iron core, wherein the inner surface and the outer surface of the radial rotor iron core are conic and are parallel to the surface of the conic hole of the radial stator iron core. The radial rotor iron core is arranged on the outer surface of the rotor shaft. The radial rotor iron core is arranged in the radial stator iron core in a sleeved manner, and a conic work clearance is formed between the radial rotor iron core and the radial stator iron core. A thrust disc is arranged atthe cooperation position of the rotor shaft and the axial magnetic suspension bearing. Axial unloading force, in the direction of the rotor shaft, generated by the permanent magnet on the radial rotor iron core is used for unloading axial loads, and the burden of the axial magnetic bearing is reduced.

Description

technical field [0001] The invention relates to the technical field of magnetic levitation, in particular to a magnetic levitation structure and a fan. Background technique [0002] In order to achieve ultra-high speed operation and long life of equipment, clean and oil-free, magnetic suspension support is currently used in many equipment drive equipment. [0003] When magnetic bearings are used in blowers, compressors, etc., due to the pressure difference between the inlet and outlet of the impeller, a very large axial load will be generated on the rotor. Therefore, higher requirements are put forward for the design of the axial magnetic bearing. In order to achieve high load capacity on axial magnetic bearings, the following methods are usually adopted: [0004] 1. Adopt an axial magnetic bearing rotor thrust disc with a larger outer diameter. But on the one hand, the maximum outer diameter of the thrust disc is limited by the strength of the rotor material. On the oth...

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Problems solved by technology

But on the one hand, the maximum outer diameter of the thrust disc is limited by the strength of the rotor material

On the other hand, wind friction in the thrust disk portion is approximately proportional to the fifth power of the outer diameter of the thrust disk, so a large thrust disk will generate considerable rotor wind friction

[0005] 2. The coils and flux paths in the stator are large in size, which leads to a large axial dimension of the stator, which in turn leads to a long axial length of the rotor, which is limited by the shaft modal frequency

[0006] 3. A large current is passed through the coil

But this is limited by the temperature rise of the windings, and the power of the electronic equipment

[0007] Therefore, the existing method of improving the load capacity of the axial magnetic bearing has a relatively large adverse effect on other aspects of the overall magnetic levitation structure while improving the axial load capacity, and it is difficult to obtain better results

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