Basic principles of electromechanical energy conversion: coupling field, rotational converter, conditions for generating nonzero torque, conversion losses, equations of mathematical model. Basic information of the rotating electrical machines: stator and rotor, magnetic circuit and windings. Classification of rotating electric machines. DC machines: constructional details and principle of operation, excitation methods, separately excited machine, electromotive force and electromagnetic torque, mathematical model, steady-state equivalent circuit, mechanical characteristic, power losses and power balance, speed regulation, power converters for DC machine. Induction machines: constructional details and principle of operation, principles of torque generation, mathematical model, steady-state equivalent circuit, torque expression, mechanical characteristic, power losses and power balance, variable speed induction machines, power converters for induction machine. Synchronous Machines: constructional details and principle of operation, steady-state operation, equivalent circuit, mechanical characteristic, permanent magnet synchronous motors, power converters for synchronous motor.