关键词: 永磁轴承, 多胞元, 结构设计, 承载特性

Abstract:

Permanent magnet thrust bearings featured high rotational speed， low noise， and frictionless operations， but suffered from low load carrying capacity and non-universal structures. Aiming at these problems， a modular multi-cellular element structure of permanent magnet thrust bearings was proposed， where four permanent magnets formed a single cell element. By adjusting the number and arrangement of cell elements， various nested and crossover configurations were realized. Based on the finite element software， the bearings with two-layer nested two-pole crossover， four-layer nested four- pole crossover， six-layer nested six- pole crossover and eight-layer nested eight-pole crossover were constructed with a total of four structures， and the load carrying performances of the different structures were analyzed. The simulation results show that the bearing capacity first increases and then decreases with the increase of axial displacements， and the maximum axial bearing capacity of the permanent magnet thrust bearings of the four configurations was as 6.78，50.52，136.85，288.9 kN. Finally， a four-layer nested four-pole-crossed permanent magnet thrust bearing prototype was fabricated and the axial bearing capacity experimental validation was carried out， and the results show that the maximum load capacity of the experiments is 4.2% lower than the simulation value.

Key words: permanent magnet bearing, multi-cellular element, structural design, carrying characteristics