Wheel sensor for a unit signaling a clear railway line has an inductive sensor on a railway line to detect a change in a magnetic field as the iron wheels of a railway vehicle pass over a rail

摘要

An inductive sensor on a railway line detects a change in a magnetic field as the iron wheels of a railway vehicle pass over a rail. A system with first (La) and second (Li) coreless coils compensates for interfering magnetic fields (=Fs). The first coreless coil optimizes this compensating effect along with the second coreless coil that fits inside the first coreless coil and generates a magnetic field in an opposite direction during a combined supply of current.