Static switching system for instantaneous changeover of a series DC machine energized by a current chopper. The field of the machine is connected at a first point to the smoothing choke of the chopper and at a second point between two rectifying arms, one made of diodes and the ether made of thyristors, the armature of the machine being connected between two mid-points of the above rectifying arms. A first control logic determines the voltages between the above mentioned first point and the mid-points of the rectifying arms. A second control logic triggers the thyristors in function of such voltages to perform the changeover.
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