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Correction published on 20 January 2015, see Energies 2015, 8(1), 682-683.

Energies 2014, 7(6), 3561-3575; doi:10.3390/en7063561

Cascaded Position-Flux Controller for an AMB System Operating at Zero Bias

1,* , 1
1 Lappeenranta University of Technology, P.O. Box 20, Lappeenranta 53851, Finland 2 Bialystok University of Technology, Wiejska 45C, 15-351 Bialystok, Poland
* Author to whom correspondence should be addressed.
Received: 20 March 2014 / Revised: 15 May 2014 / Accepted: 23 May 2014 / Published: 30 May 2014
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The paper reports on the implementation and the design of a controller for a fuel cell blower (FCB) with active magnetic bearings (AMBs). The cascaded position-fluxcentralized controller is comprised of a centralized position control loop and an inner flux control loop. The last one is based on state estimation without explicit flux measurements. As the position control is not dependent on the magnetic field nonlinearities, such a control structure enables operation under a zero bias. The practical working implementation of a flux control for the industrial levitated rotor is shown for the first time. The flux control gives better results than current control for both normal and zero bias operation. The system is analyzed fully, combining rotor dynamics and power amplifier analyses simultaneously. The importance of using the coil voltage in addition to current and practical treatment of the flux control is revealed. The centralized position-flux controller is compared with a state-of-the-art cascaded position-current control, which has inner current control loops. The proposed control solution with a zero bias can achieve a dynamic performance comparable that of a controller with the classical bias current.
Keywords: magnetic bearings; flux control; fuel cell magnetic bearings; flux control; fuel cell
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Jastrzebski, R.P.; Smirnov, A.; Mystkowski, A.; Pyrhönen, O. Cascaded Position-Flux Controller for an AMB System Operating at Zero Bias. Energies 2014, 7, 3561-3575.

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