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M. Hofer, D. Wimmer, M. Schrödl:
"Analysis of a Current Biased Eight Pole Radial Active Magnetic Bearing Regarding Self-Sensing";
Talk: ISMB16, Beijing, China; 2018-08-13 - 2018-08-17; in: "ISMB16", (2018).

In this work a current biased radial active magnetic
bearing is investigated with regard to a possible self-sensing
operation. The bearing is designed by the help of finite element
methods. The force characteristic is investigated and bearing
parameters are identified by simulation. Additionally, the
position dependency of the coil inductances is evaluated which is
the basis for self-sensing. The fundamental principle of the rotor
position determination based on current slopes by using the
differential open loop transformers approach is presented.
Further, simulations are performed to analyze AMB current
signals with regard to the rotor position. Finally, experimental
tests with an AMB prototype are shown to verify the theoretical
analysis. The measured rotor position at constant eccentricity
confirms the functionality and represents the starting point for a
future implementation of the self-sensing control to the
prototype and detailed analysis of the self-sensing performance

https://publik.tuwien.ac.at/files/publik_276579.pdf