The paper discusses systems for the stabilization and control of voltage, current, rate, and torque of electrical motors which use silicon controlled rectifiers SCR. Detailed discussions cover the following topics the output characteristics of stabilization systems using SCRs means of increasing the accuracy of tachometric feedback output stabilization of controlled rectifiers with resistors the structure of a SCR and its properties volt ampere characteristic of a SCR the principle of output voltage control of rectifiers using SCRs the operation of a half-wave rectifier using a SCR and three-phase bridge-type rectifiers using SCRs. The design of trigger circuits for SCRs are listed. The advantages of using semiconductor devices in such circuits over magnetic devices are indicated. The operation principle of a trigger circuit using transistors intended for an SCR, and schematic of a system for automatic control of voltage and current of a three-phase rectifier using SCRs and its application to the control of speed of a DC motor with external excitation are considered. The relative advantages of using either semiconductor devices or magnetic devices in rectifier control systems are discussed and the factors governing the choice of the device are listed. Measures protecting a SCR control system against current overloads are discussed. Some specifications of a system using SCRs and intended for the stabilization of voltage, minimal and maximal current of a SCR developed at the Department of Electrical Machines Katedra Maszyn Elektrycznych are given.
Unedited rough draft trans. of Przeglad Elektrotechniczny (Poland) v19 n8 p285-289 1965, by L. Marokus.