Kruger, Gert L.Van Schoor, GeorgeVan Vuuren, Pieter A.2017-11-022017-11-022017Kruger, G.L. et al. 2017. Pseudo-magnetic centre identification of an active magnetic bearing for sensorless drive control start-up. IFAC-PapersOnLine, 50(1):4837-4842. [https://doi.org/10.1016/j.ifacol.2017.08.971]2405-8963http://hdl.handle.net/10394/26013https://doi.org/10.1016/j.ifacol.2017.08.971https://www.sciencedirect.com/science/article/pii/S2405896317314441A method of identifying runout of an active magnetic bearing at standstill and low speed is presented. The on-line current bias injection method found in literature is improved, but is still found to converge too slowly for sinusoidal tracking. A new method which approximates the deviation from the magnetic centre using a disturbance force observer is presented and tested on an experimental fly-wheel AMB system. The new on-line method is fast enough for real-time tracking of the magnetic centre deviation. The estimated angle derived from the pseudo-magnetic centre was successfully utilized for start-up of the drive’s sensorless vector controlenRunout identificationMagnetic bearingsSensorless vector controlPresentation