ABSTRACT
Repulsive forces (RFLS) occur between current carrying conductors of positive polarity or between a moving current carrying coil and a short-circuited fix electric circuit and between a moving permanent magnet (PM) and a fix short-circuited electric circuit or between two PMs of opposite polarity. The interaction of levitation, guidance, and propulsion in RFLS magnetically levitated vehicles (MAGLEVs) has been introduced to save energy and reduce initial system cost. The larger gaps for MAGLEVs and the simpler control for magnetic bearings make RFLS attractive in applications. The chapter deals with RFLS competitive technologies; scalar field distribution; levitation and drag forces for sheet secondary; Levitation and drag forces for ladder secondary; and RFLS dynamics, stability, and active damping. The null-flux system may be realized with horizontal or with vertical coils; the vertical coil solution is easy to build and handle by the vehicle.
