Abstract
The relevance of the use of AC-AC power transmission systems on vehicles, including autonomous locomotives, using synchronous generators and traction synchronous motors is showed. Typical block diagram of electric transmission of traction rolling stock and functional diagram of electric power transmission with synchronous generator and traction motors are given. Based on the theory of a generalized electrical motor, a mathematical description has been devel-oped in a two-phase coordinate system for a synchronous generator with excitation winding and starting winding and a synchronous motor with permanent magnets, its equivalent schemes are shown. The results of simulation in Matlab Simulink of electric system with two traction motors connected to frequency converters with two-level voltage source inverters are given. Direct torque control system with a table function of switching the voltage source inverter by output signals of relay regulators of torque and flux linkage is used for motor control. Based on the obtained re-sults, recommendations for the synthesis of energy-efficient control systems for synchronous motors with permanent magnets are given
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