M0102-Electrical Machines A
Description: The contents of the semester course Electrical Machines within the specialization on Electrical Energy is as follows:
a) Introduction to electric machinery principles: production of a magnetic field, magnetic behavior of ferromagnetic materials, magnetically coupled circuits, energy losses, production of induced voltage and induced force.
b) Transformers: type and construction, theory and operation of real single-phase and three-phase transformers, magnetization current, equivalent circuit and phasor diagram of a transformer, analysis of no-load and full-load operation, experimental determination of the transformer parameters, voltage regulation and efficiency, autotransformer.
c) Direct current electric machines: principle operation and construction, commutation and armature construction, rotor windings, problems with commutation and solutions, power flow and losses in dc machines, dc generators and motors, equivalent circuit, dc machines characteristic curves, control of terminal voltage and rotor speed.
d) Laboratory exercises.
M0103-Electrical Machines B
M0104-Electrical Machines C
Description: After the successful completion of the course the students should be able to:
1) Design, in their basic form, the stator and rotor of a synchronous machine so that the created magnetic fields produce the proper electromagnetic torque.
2) Calculate the various electrical parameters and the operating limits of a synchronous machine under steady-state conditions
3) Calculate the behavior of a synchronous machine under symmetrical and non-symmetrical short-circuit conditions at its terminals.
4) Determine the appropriate control on the machine excitation so as to change the reactive power, the magnitude of the voltage and the power factor at the machine terminals. 5) Differentiate the aforementioned methodologies according to the rotor type (cylindrical or salient-pole).
L0301-Power Electronics I
L0301-Power Electronics II
Description:After the successful completion of the course, the students will be able to:
1) Analyze and design dc/dc switching buck converters that satisfy certain design criteria.
2) Analyze and design dc/dc switching boost converters that satisfy certain design criteria.
3) Analyze and design dc/dc switching buck-boost converter that satisfy certain design criteria.
4) Analyze and design-by implementing various PWM techniques- dc/ac switching inverters that satisfy certain design criteria. 5) realize the interdependences among two or more of the above switching converter operating in the same power grid.
1209-Servomotor System Drives
Description:The contents of the semester course Servomotor Systems within the specialization on Electrical Energy is as follows:
a) Basic principles of electromechanical energy conversion, permanent magnets, reference frame theory, transformation between reference frames and dynamic models of ac electric machines.
b) Power converters, PI controller, speed and position sensors (design and operation) and types of modulations.
c) Vector control methods of an induction generator (direct and indirect methods, dynamic performance), direct torque control (DTC) method of induction motors, brushless dc motors (design and control), non-salient type brushless ac motors (design and control) and salient type brushless ac motors (design and control).
d) Laboratory exercises.
EN1208-Electric Motion Systems
Description:After the successful completion of the course, the students should be able to:
1) Determine the power-speed and torque-speed relationship of various mechanical loads.
2) Calculate the size and type of the electric motor as a function of the size and type of the mechanical load. Then, they should be able to calculate the size and type of the power-electronics converter as a function of the electric motor characteristics.
3) Calculate the thermal stress of an electric motor under various starting methods or under speed variation conditions.
4) Calculate the electrical parameters of an induction motor when fed from a source of variable voltage magnitude and frequency
5) Design an algorithm based on the field-orientation method for controlling a synchronous motor