Abstract: A floating apparatus for use in an attractive floater railway includes a magnetic rail mounted on the underside of a track. The magnetic rail comprises sheets of ferromagnetic material laminated together and is formed to have a cross section in the shape of a trapezoid or a quadrant of a circle with faces of the rail including a horizontal surface and a vertical surface. A guiding electromagnet is disposed opposite to the vertical surface and a supporting electromagnet is disposed opposite to the horizontal surface. The electromagnets are mounted on a truck and are constructed such that the respective fluxes thereof flow in opposite directions in the magnetic rail. The magnetic rail may include a magnetic propulsion rail opposite to a linear inductor machine to provide both vertical support and horizontal propulsion to the truck.

Abstract: An AC motor control method and apparatus therefor, for controlling an AC motor 11 by holding the excitation current I.sub.0 of the AC motor 11 constant and varying primary current I.sub.1 in accordance with a speed deviation .DELTA.n. Stored previously in a memory device 18 are a torque T-slip frequency .omega..sub.s characteristic, a slip frequency .omega..sub.s -primary current vector I.sub.1 characteristic, and a slip frequency .omega..sub.s and phase .phi..sub.1 characteristic which take secondary leakage reactance into account. Slip frequency .omega..sub.s, primary current vector I.sub.1 and phase .phi..sub.1 are read out of the memory device in accordance with the torque command T obtained from the speed deviation .DELTA.n, whereby three-phase current commands i.sub.u, i.sub.v, i.sub.w are produced. Accordingly, torque irregularity is suppressed and an excellent response obtained.