Setup with Two Self-Sensing Magnetic Bearings Using Differential 3-Active Inform

This paper describes how a rotor with two radial self-sensing Hybrid Magnetic Bearings (HMB) with a novel self-sensing method is set up. Replacing position sensors with low cost alternatives currently is a broad field of research as it allows to decrease costs significantly. First the adapted version of the INFORM method in use is described in detail, explaining the advantages compared to the classic INFORM. Next the results of a 3D electro-magnetic finite element simulation are shown. The simulation was used to find an optimal geometry concerning the mutually exclusive goals of maximising bearing force and sensitivity / linearity of the INFORM method. Finally the simulation results are compared to measurements on the prototype.