Displacement detector in transfer apparatus and driving controller of transfer member

摘要

The invention relates to a displacement detector for a wire rope (2) made of a magnetic substance, said displacement detector being provided in a transport apparatus having a pulley (13) engaging with said wire rope (2) and a transport unit travelling together with said wire rope (2) or said pulley (13), and said detector being designed to detect a relative position between the wire rope (2) and the pulley (13), comprising: displacement detecting coils (19) disposed at an equal interval of one side face of the pulley (13) and electrically connected in series, a revolving side coil (28) disposed on the pulley (13) and connected to the end of the displacement detecting coils (19) connected in series, a stationary side coil (30) disposed opposite of the revolving side coil (28), and forming a transformer together with the revolving side coil (28) by being applied with a DC voltage, and a detecting means connected to both ends of the stationary side coil (30) for detecting an impedance change generated in the displacement detecting coils (19). <IMAGE>