2015-05-042015-05-041999-03-23Bayazitoglu, Yildiz and Shampine, Rod W., "Longitudinal electromagnetic levitator." Patent US5887018A. issued 1999-03-23. Retrieved from https://hdl.handle.net/1911/79832.https://hdl.handle.net/1911/79832An electromagnetic levitator is disclosed, comprising: a plurality of longitudinal sections formed from a conducting material and arranged around a longitudinal axis. The longitudinal sections are connected to a power source such that when the levitator is in operation, current flowing through adjacent longitudinal sections creates opposing magnetic fields. The levitator has first and second ends defining a levitation zone therebetween. When alternating current is passed through the conductors, a levitation tunnel is formed in the levitation zone, with the levitation tunnel having zero magnetic flux density along its center and non-zero magnetic flux density at all other points.15 ppengUtility patentUS5887018A