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Th. Nenning, M. Hofer, M. Hutterer, M. Schrödl:
"Statistic Errors of Different INFORM Evaluation Methods applied to Magnetic Bearings";
Talk: 14th International Symposium on Magnetics Bearings, Linz; 2014-08-11 - 2014-08-14; in: "Proceedings of 14th International Symposium on Magnetics Bearings", (2014), 685 - 688.

Active magnetic bearings offer many advantages
compared to conventional bearings. But due to economic reasons
their field of application is relatively small. Self-sensing magnetic
bearings can contribute to a significant decrease of the system
costs, of course at limited accuracy in position detection compared
to systems with sensors.
The later on described INFORM method is one approach to selfsensing
magnetic bearings. The position depending reluctance
is measured through high frequent voltage injections and the
resulting current slope. This paper discusses how different
evaluation methods capable of calculating the current slope
from the raw measurement data, differ in sensitivity and noise
rejection. Therefore first the theoretical background of the used
self-sensing method is explained. Next the error propagation of
different evaluation methods is analysed and finally compared to
measurements

http://publik.tuwien.ac.at/files/PubDat_230390.pdf