The basic considerations on the configuration of linear motor systems with alignment of permanent magnet poles mounted on vehicles

Experimental analyses of the magnetic fields for the periodical arrangement of permanent magnet poles are described. The magnetic fields which interact with the current of the armature coils on the ground are discussed from the viewpoint of the effectiveness for propulsion per pole-pair. Three kinds of armature coil systems of flip-flop linear motors (FF-LMs) with different current conduction modes are considered in comparison with the usual linear synchronous motors (LSMs). They are named 180-mode, 120-mode and 90-mode for the respective conduction period expressed in electrical degree. Both the mean propulsive forces and the work expected by the unit armature coil conducting the same RMS current and contributed by a single pair of magnet poles are examined for the various conduction modes