Objectives and competences
Objectives:
The objective of this course is for students to be able to demonstrate the understanding of fundamental laws of physics on which are based working principles of electrical machines and to be able to evaluate their capability and efficiency in practice.
Competences:
Transfer of theory to practice; ability to use instruments and procedures; ability of individual and group-work; work organizing and planning; verbal and written communication, safety at work.
Content (Syllabus outline)
• Introduction: basic types of transformers and rotating electrical machines.
• Magnetic properties of soft magnetic and hard magnetic materials.
• Fundamentals of heating and cooling in electrical machines, insulation classes.
• Efficiency and efficiency classes of rotational electrical machines.
• Electric transformers: active and passive components of transformers, operation principle, equivalent electric circuit, basic transformer measurements.
• Fundamentals of three-phase and poly-phase distributed windings, revolving magnetic field.
• Synchronous machines: active and passive components of synchronous machines, topologies of synchronous machines, operation principle, equivalent electric circuit, basic tests of synchronous machine.
• Induction machines: active and passive components of induction machines, topologies of induction machines, operation principle, equivalent electric circuit, basic tests of induction machine.
• Brush-commutator machines: stator and rotor construction elements; different connections of excitation and armature windings, electromotive force; commutation process, operation principle, basic tests of brush-commutator machines.
• Noise and vibrations: noise and vibrations measurements in rotating electrical machines.
• Fundamentals of monitoring and maintenance of electrical machines.
Learning and teaching methods
• Lectures by using power-point slides and whiteboard.
• Auditory exercises.
Laboratory exercises.
Intended learning outcomes - knowledge and understanding
Knowledge and understanding:
On completion of this course the student will be able to
• list the basic types of electrical machines and their field of application;
• explain basic physical principles in electrical machines;
• perform basic tests of electrical machines independently or in a group;
• calculate parameters of equivalent circuit of electric machines for steady states;
• produce measurement reports of standardized tests;
• determine the performance of electrical machines based on measurements;
• explain the role and need for monitoring and maintenance of electrical machines;
• analyze the results of noise and vibration measurements in electrical machines.
Intended learning outcomes - transferable/key skills and other attributes
Transferable/Key Skills and other attributes:
• Communication skills: manner of written expression at written examination, manner of oral expression at oral examination, oral lab wok defence.
• Use of measurement instruments: use of measurement instruments and sensors for measuring of current, voltage, electric power, shaft torque and speed.
• Problem solving: problem analysis, design and execution of tests, interpretation of results.
Readings
Temeljna literatura in viri/Fundamental reading materials:
I. Zagradišnik, B. Slemnik: Električni rotacijski stroji, FERI Maribor, 2012.
D. Žarko, B. Ćućić: Transformatori u teoriji i praksi, Graphis Zagreb, 2020.
Dodatna literatura in viri/Additional reading materials:
D. Miljavec, P. Jereb: Električni stroji, Ljubljana, 2005.
H. A. Toliyat, G. B. Kliman: Handbook of Electric Motors, CRC Press, 2004.
F. Avčin, P. Jereb: Preizkušanje električnih strojev, Tehniška založba Slovenije, 1973.
J. F. Gieras, C. Wang, J. C. Lai: Noise of polyphase Electric Motors, Taylor & Francis, 2006.
A. Hand: Electric motor maintenance and troubleshooting, Mc Graw Hill, 2011.
N. Srb: Magnetski monitoring električnih rotacijskih strojeva, Graphis Zagreb, 2004.
Additional information on implementation and assessment Method (written xamination, oral examination, laboratory exercises):
• written exam
• oral exam
• laboratory work
Notes:
The student must finish each part of the exam (written part of the exam, oral part of the exam, defence of laboratory work) with at least 50%.
In the case of two midterm tests, which can replace written exam, each of them has to be done with at least 50% to pass the written exam successfully.
