FIELD: for changing the vehicle tractive force and speed. SUBSTANCE: for reducing the excitation of traction motors by shunting their field windings, maintaining the reduction during the whole period of traction and stabilizing the current equal to the difference of currents of the armature winding and field winding, the device uses electric circuits consisting of series-connected field windings and armature windings of traction motors, DC current regulation unit, diode rectifier, reverser and power source. EFFECT: facilitated procedure. 1 dwg
