Low Loss Magnetic Bearing using Soft Magnetic Composites

近年来，磁轴承技术在高速机械中越来越受到重视和接受，特别是在需要无接触和低损耗悬挂的高速机械中。然而，由于磁滞和涡流效应，制动力矩作用于完全磁悬浮转子上。因此，尽管采用无触点悬挂，转子仍会出现损耗。在这个研究项目中，计算表明，应用软磁复合材料和一种新的轴承结构可以显著减少磁悬浮转子的这些损失。基于这种新结构，设计、制造并测试了一种径向力和轴向力一体化的主动磁轴承。进一步的研究旨在利用完成的试验台对所设计的位置控制器进行验证和更深入的分析。此外，先前的计算结果和关于转子损失的理论假设将进行测试，并在必要时用系统实验的结果进行修正。该项目的目标是证明新的磁轴承概念显著减少转子损失的可能性，并将原型材料获得的结果转移到工业材料。

Magnetic bearing technology has lately gained in significance and acceptance especially in high speed machinery requiring contactless and low loss suspension. Nevertheless there is a braking torque acting on a completely magnetically suspended rotor which is caused by hysteresis and eddy current effects. Therefore losses arise in the rotor despite the contactless suspension. In this research project calculations have demonstrated that applying soft magnetic composites and a new bearing structure can significantly reduce these losses in magnetically suspended rotors. Based on the new structure an active magnetic bearing with integrated radial and axial force generation has been designed, build and tested.Further studies aim at verification and deeper analysis of the designed position controllers using the finished test rig. Additionally the previous calculation results and theoretical assumptions regarding the rotor losses are to be tested and if necessary corrected with results from methodical experiments. The goals of the project are to prove the possibility of significant reduction of rotor losses with the new magnetic bearing concept and to tranfer the results gained with prototyping materials to industrial materials.