Optimization Design of Asymmetric Axial Magnetic Bearing with Unidirectional Large Bearing Capacity for Turbomachinery

Abstract

In order to overcome the large axial thrust generated by the working substance (steam or gas, etc) of turbomachinery, an asymmetric axial magnetic bearing (AAMB) is proposed. Firstly, the topology and features of the AAMB are introduced. The magnetic circuit model of the AAMB is established by the reluctance network method. Secondly, the constraints such as the load capacity and dimensions are considered. Then we take the shortest axial length as the optimization goal to design the AAMB, and the design scheme is obtained through genetic algorithm (GA). Finally, the supporting characteristics of the AAMB are verified by finite element method (FEM). The result shows that the overall axial length of the AAMB is less than 82.1 mm of that in the traditional design scheme.