Contactless distance measuring device - between hovering vehicle and fixed armature rail uses magnet on vehicle energised with AC

摘要

The core of the electromagnet on the vehicle consists of several magnetic circuits so shaped and arranged, that the effect of distance change in at least one dimension is not equivalent in individual circuits; at least one of the circuits is closed through the core itself, and the others through the rail; magnetic flux is measured in at least one of the magnetic circuits. The electromagnet core (39) has two excitation windings (35, 36) carrying current half-waves of opposite polarities with such winding sense, that the armature (rail)(11) carries a pulsating constant field, while an alternating flux is generated in the core central limb (44); the alternating flux is measured.