Subject description
Nominal data and operation of electrical machines. Magnetic field. Induced voltage. Electromagnetic torque. Losses and efficiency. Heating of electrical machines.
Physical design of transformer. Active and passive components of the transformer. Connection types of three-phase transformer. Equivalent circuit of the transformer. Basic measurements of the transformer.
Physical design of synchronous machine. Structure of the stator and the various embodiments of the rotor. Passive components of synchronous machine and their role. Different types of load and operation. Phasor diagram of synchronous machine rotor turbo. Phasor diagram of synchronous machine with salient poles. Specific types of synchronous machines ( SRM , BLDC , stepper motors ) .
Physical design of induction machine. Structure of the stator and the various embodiments of the rotor. Passive induction machine parts and their role. Torque curve . Controlling the speed of rotation. Single-phase induction motors. Basic tests of induction machine.
Physical design of commutator machine. Various stator and rotor types. Passive collector machine parts and their role. Winding connections of DC commutator machines and operating characteristics. Characteristics of DC machine. Universal motor.
The subject is taught in programs
Objectives and competences
After successful completion of the course, students should be able to:
– define the input and output characteristics of electrical machines,
– explain the physical principles at electrical machines of various types.
– evaluate the most appropriate machine types for a specific application,
– analyze the specificities of the conditions in which electric machines operate,
– evaluate the performance of electrical machines based on measurements,
– classify the requirements of electrical machines according to their application in the device.
Teaching and learning methods
Lectures and laboratory work. Laboratory exercises are with heightened risk (high voltage, rotating parts, …).
The course consists of 45 hours of lectures and 30 hours of laboratory exercises with heightened risk.
Expected study results
The student will understand the operational principles of electric machines. Understand the basic characteristics of various types of electrical machines. Understand the basic problems in the production and use of each machine. He will know the applicability of individual electrical machines.
Basic sources and literature
- Damijan Miljavec, Peter Jereb: Električni stroji – temeljna znanja, Ljubljana, 2016
- Stephen J. Chapman, Electric Machinery Fundamentals, McGraw-Hill Higher Education; 5 edition, 2011
- Dino Zorbas, Electric Machines, Nelson Engineering , 2014
- P. C. Sen, Principles of Electric Machines and Power Electronics, John Wiley & Sons; 3rd Edition, 2013
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University of Ljubljana, Faculty of Electrical Engineering Tržaška cesta 25, 1000 Ljubljana