Control device for the displacement of independent vehicles electrically driven along a traffic line, especially motorized freight cars as part of an airfreight handling installation

摘要

Each carriage is equipped with a three-phase two-speed pole-switching induction motor and front and rear shock- absorbers. The track incorporates low-voltage AC supply lines (R.S.T) and a control line, which is divided into isolated sections capable of being interconnected via the carriage. The three control signals are full-wave alternating voltage and the two pulse waveforms produced by suppression of one or other half-wave. A discriminator relay circuit connected to the current collectors in contact with two lines operates the control logic so as to move the carriage at a higher or a lower speed or bring it to rest, in accordance with the control line waveform. Different sections of track can be controlled for different speeds, or the whole can be used as a storage zone.