1. Introduction. General characteristics of model of electric drive and control systems. General remarks on control by means of microprocessors. 2. Signal Processing. Sampling of continuous signals. Analogue and digital filters. Quantization of signals. A/D and D/A converters. The systems for connecting microcomputers with peripheral equipment. 3. Digital Control Algorithms. General problems. Digital algorithms of the PID class. Controller with definite setting time. Other algorithms of digital control. 4. Computer-aided Design of the Digital Control of Electric Drives. General principles. Principles of the simulation of digitally controlled electric drive systems. Principles of parametric computer optimization. Computer methods of designing digital filters. Discrete frequency computer methods. 5. The Many-sided Problems of Electric Drive Controls. Multimachine electric drive systems. Systems, large-scale systems and complex systems. A complex mathematical model of a rolling mill. Types of hierarchical structures. The organization of a multiprocessor system. Complex automatic systems. References. Index.