Learning Outcomes
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) Calaculate 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
Course Content (Syllabus)
The course deals with the basic principles of a complete electric motion system comprising the mechanical load, the electric motor and the power electronics converter which feeds the electric motor.
The following are analyzed:
1) The basic principles of motion with emphasis on the rotational motion.
2) The types of the mechanical loads and the associated power-speed and torque-speed characteristics.
3) The demands imposed on the electromagnetic torque, currents and power losses, by the variation of the rotating speed of the mechanical load.
4) The behavior of induction motors in dynamic operation modes such as the start-up or the speed variation.
5) The ability to change the electromagnetic torque and the speed of an induction motor by changing either the voltage magnitude or voltage magnitude and the frequency at the same time
6) The scalar control of induction motors at speeds that are lower or larger the rated one.
7) The starting of the induction motors and their respective thermal stress with: (1) full voltage, (2) reduced voltage, (3) continuously changing the voltage magnitude, (4) continuously changing the voltage magnitude and frequency
8) The breaking of induction motors and its effect on the power electronics converter
9) Control of synchronous motors with the field-orientation method.
Keywords
rotating motion, starting if electric motors, losses in electric motors, mechanical loads
Course Bibliography (Eudoxus)
1) Π. Μαλατέστας, "Ηλεκτρική Κίνηση", ISBN: 978-960-418-251-0, ΕΚΔΟΣΕΙΣ Α. ΤΖΙΟΛΑ & ΥΙΟΙ Α.Ε., 18548785
2)R. Krishnan, (μετάφραση Αθ. Καρλής)"Ηλεκτρικά Κινητήρια Συστήματα, Μοντελοποίηση,
Ανάλυση και Έλεγχος", ISBN: 978-960-461-233-8, ΕΚΔΟΣΕΙΣ ΚΛΕΙΔΑΡΙΘΜΟΣ ΕΠΕ, 2009 ΘΕΣ/ΝΙΚΗ, Κωδικός στον ΕΥΔΟΞΟ: 13769