Static switching device for two direct current machines

Control system for solid state switching of two direct current machines operating as motors or generators, comprising two circuits connected in parallel on the terminals of a direct current source, the first circuit comprising, in series and in the following order, a first chopper, a first smoothing inductance, a field winding in the first machine, a first switching thyristor and an armature in the said first machine, the second circuit comprising, in series and in the following order, an armature in the second machine, a second switching thyristor, a field winding in the second machine, a second smoothing inductance and a second chopper, first and second connections for connecting the two circuits together, the first connection connecting the anodes of said first and second switching thyristors, the second connection connecting the cathodes of said first and second switching thyristors, the first connection comprising a third switching thyristor, the second connection comprising a fourth switching thyristor, the system comprising an electronic control unit transmitting control pulses to the triggers of said switching thyristors and to those of said first and second choppers for operating the machines as motors or generators.