Objectives and competences
The objective of this course is for students to recognize electrical and electromechanical converters, to be able to demonstrate understanding of the basic principles of operation of electrical and electromechanical converters and to use them in practice.
Content (Syllabus outline)
Introduction: magnetic field, excitation of winding, induced voltage, forces in magnetic field and torque, conversion electrical power into electrical or mechanical power, losses, efficiency, heating and cooling.
Transformer: elements of construction, principle of operation, ideal and real single-phase transformer, equivalent circuits, tests of transformer, operation on stiff supply, Kapp’s diagram, energy balance, losses and efficiency, parallel operation, current transformer, a three-phase transformer, particular transformer types.
Induction Machine: constructional features, basic types of alternating windings, principle of operation, analytical treatment, equivalent circuit, energy balance, circle diagram, starting of motors end speed control, induction generator, particular types of motors, single-phase induction motors.
Synchronous Machine: constructional features and principle of operation, takeover the load, analytical treatment, operating on stiff supply, approximately handling of saturated machines, speed and torque control, current characteristics, excitation systems and use of permanent magnets for excitation, synchronous motors with permanent magnets, reluctance motors.
Commutator Machine: constructional features and principle of operation, armature windings, theory of DC machines, armature reaction, commutation, commutator set, DC commutator machine configuration, construction of performance characteristics, starting and speed control, single-phase commutator motor, servomotors.
Learning and teaching methods
• lectures,
• tutorial,
• lab work,
• homework assignments.
Intended learning outcomes - knowledge and understanding
On completion of this course the student will be able:
• recognize the basic types of electrical and electromechanical converters,
• explain the basic principles of working of the electrical and electromechanical converters,
• use the electrical and electromechanical converters and
• analyze the operation of electrical and electromechanical converters.
Intended learning outcomes - transferable/key skills and other attributes
Communication skills: oral and written examination.
Use of information technology.
Organisation skills.
Calculation skills: mathematical content of the subject.
Problem Solving: calculating of characteristics.
Working in a group: working in a group during lab work.
Readings
• ZAGRADIŠNIK, Ivan, RITONJA, Jožef. Električni in elektromehanski pretvorniki : zapiski predavanj. [Ponatis]. Maribor: Fakulteta za elektrotehniko, računalništvo in informatiko, 2014. 181 str., ilustr. ISBN 978-961-248-377-7. [COBISS.SI-ID 18284822]
• RITONJA, Jožef (avtor, ilustrator), ZAGRADIŠNIK, Ivan (avtor, ilustrator). Transformatorji : učbenik. 1. izd. Maribor: Univerzitetna založba: Fakulteta za elektrotehniko, računalništvo in informatiko, 2020. 1 spletni vir (1 datoteka PDF (III, 153 str.)), ilustr. ISBN 978-961-286-373-9. https://press.um.si/index.php/ump/catalog/book/492, https://press.um.si/index.php/ump/catalog/view/492/595/995-2, https://dk.um.si/IzpisGradiva.php?id=77429, DOI: 10.18690/978-961-286-373-9. [COBISS.SI-ID 25942019]
• PETRUN, Martin. Electrical and electromechanical converters : Instructions for laboratory exercises - Part I: Transformers and three-phase induction motors. Maribor: Fakulteta za elektrotehniko, računalništvo in informatiko, 2020. II, 44 str., ilustr. https://dk.um.si/IzpisGradiva.php?id=75961.
• PETRUN, Martin. Electrical and electromechanical converters : Instructions for laboratory exercises - Part II: Single- and two-phase induction motors, synchronous generators and DC machines. Maribor: Fakulteta za elektrotehniko, računalništvo in informatiko, 2020. II, 32 str., ilustr. https://dk.um.si/IzpisGradiva.php?id=75962
• CHAPMAN, Stephen. Electric Machinery Fundamentals, 5th Edition. McGraw Hill Education, 2011.
• FITZGERALD, A. E., KINGSLEY, C., UMANS, S. D. Electric Machinery, 6th Edition. McGraw Hill, 2005.
Additional information on implementation and assessment The midterm exams (3) may be replaced with a written exam.
