Th. Nenning, M. Hofer, M. Hutterer, M. Schrödl:
"Setup with two Self-Sensing Magnetic Bearings using Differential 3-Active INFORM";
Talk: 14th International Symposium on Magnetics Bearings, Linz; 08-11-2014 - 08-14-2014; in: "Proceedings of 14th International Symposium on Magnetics Bearings", (2014), 689 - 692.

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.

http://publik.tuwien.ac.at/files/PubDat_230388.pdf