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Adaptive Bias Current Control of an Active Magnetic Bearing Under Motion-Induced Eddy Currents
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| Author(s) |
Timon DEWITTE, Ruben DE CROO, Frederik DE BELIE |
| Abstract |
This paper investigates the impact of motion-induced eddy currents on the dynamic performance of active magnetic bearings (AMBs) with a solid rotor. Since these eddy currents weaken the magnetic field in the air gap, the force exerted on the rotor is reduced which affects the dynamic behaviour of the AMB. An analytical model of the change in magnetic field distribution is presented and compared with simulation results using the finite element method for different rotor speeds.An adaptive control approach comprising a parameter estimation algorithm and a PI controller is implemented to mitigate these effects. This is based on an augmented Kalman filter which estimates the bias current corresponding to the weakened magnetic field. Based on this estimate, the actual bias current is adapted in order to counteract the reduction in magnetic field. Experimental results of the adaptive algorithm are presented and compared to simulation results. |
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| Filename: | 0092-epe2025-full-18161890.pdf |
| Filesize: | 514.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2025-08-31 by System |
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