C.M.M van Lierop, J. W. Jansen, A. A H Damen, E.A. Lomonova, P. P J Van den Bosch, and A. J A Vandenput, "Model-Based Commutation of a Long- Stroke Magnetically Levitated Linear Actuator," Industry Applications, IEEE Transactions on, vol. 45, No. 6, pp. 1982 ? 1990, Nov.-dec. 2009.