Robert Boschgmbh

Herbert Aman

Rudolf Hansen

Dieter Kipp

Variable pulsing of a dc source without change of polarity is used for lossless control of the speed of a compound dc motor. The pulsed dc supply is fed in series through the series field winding, armature and reversing switch system and the shunt field winding has one terminal connected to the pulsed dc source and its other terminal connected respectively through two conductively poled diodes to the opposite terminals of the armature winding. Two anti-kickback devices are also provided, one of which operates during reverse-current braking. The reversing switch system has two independently actuatable single-pole double-throw switches of which the respective arm contacts are connected to the ends of the armature winding, one fixed contact of each of these reversing switches being connected to the series field winding and the other pair, likewise connected together, being connected to one terminal of the dc supply. Whenever the reversing switches are connected to fixed contacts that are connected together, the motor is turned off and the pulsing control SCR is necessarily extinguished. To turn the motor on, one of the reversing switches is thrown, the one selected determining the direction of operation of the motor to produce braking or to reverse the direction of operation, both reversing switches are thrown simultaneously. To stop energization of the motor, one of them is thrown.

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Aich, Germany

Herbert Aman