2Klontz K W, Divan D M, Novotny D W, et al. Contactless power delivery system for mining applications [ J ]. IEEE Transactions on Industry Applications, 1995, 31 ( 1 ): 27 -35.
3Esser A, Skudelny H C. A new approach to power sup- plies for robots [ J ]. IEEE Transactions on Industry Ap- plications, 1991,27 (5) :872-875.
4Hirai J, Kim T W, Kawamura A. Wireless transmission of power and information and information for cableless line- ar motor drive [ J ]. IEEE Transactions on Power Electron- ics ,2000,15( 1 ) :21-27.
5Kurs A, Karalis A, Moffatt R, et al. Wireless power trans- fer via strongly coupled magnetic resonances [ J ]. Sci- ence,2007,317 (5834) :83-86.
6Karalis A, Joannopoulos J D, Soljacic M. Efficient wire- less non-radiative mid-range energy transfer [ J ]. Annals of Physics ,2008,323 ( 1 ) :34-48.
