Modern electric machines

Course description

Overview of the global development of newer forms of electrical machines. Influence of drive system for selection and design of electric machine. The theoretical basis of modern electric machines: single and poly phase machines, permanent magnet machines, electronically commutated and hybrid machines. Energy and power in the circuit describing electromechanical system. The concept of a comprehensive model of the machine in its own coordinate system, circuit theory of electric machines. Electrical and mechanical equations of the machine and its circuit models. Selection and use of appropriate transformations of variables and models. Valuation methods, models nonlinearities, time and spatial harmonics. Using finite element method for modelling magnetic and electric conditions in electrical machines. Optimization methods in the design of electrical machines. Magnetic materials properties description with artificial intelligence methods. Application of numerical methods to solve the circuit models of electrical machines. The synthesis of acquired knowledge in concrete design of modern electrical machines.

Course is carried out on study programme

Objectives and competences

The aim of this course is to gain an in-depth theoretical and functional understanding of the operation of modern electric machines. To qualify the student for independent design of modern electrical machines. Analytical and numericaltreated stationary and transient electromagnetic and electromechanical states. Students will gaintheoretical knowledgerequiredto understandfinite element methodsfor modeling ofmagnetic and electricconditions inelectricalmachines. Also, understandingtheoptimization methodsin the design ofelectrical machines. Ability to critically assess the obtained results. Conquered depth knowledge of the theory of electrical machines will enable the design of new modern electrical machines, their integration into modern drive systems. Further implementation of modern electrical machines into electrical energy conversion systems.

Learning and teaching methods

Lectures (in the case of a large number of students) and project work.

Intended learning outcomes

After successful completion of the course, students should be able to:

– describe the principles of the operation of modern electrical machines,

– connect various physical phenomena of the operation of electric machines in the direction of their design,

– apply the method of finite elements to the field of modelling of modern forms of electric machines,

– analyse the results obtained by the finite element method and present them in the form of model circuits,

-calculate stationary and transient electromagnetic, electromechanical and thermal states in electrical machines,

– design of new modern electric machines.

Reference nosilca

Vidmar G, Miljavec D (2015) A universal high-frequency three-phase electric-motor model suitable for the delta and star winding connections. IEEE transactions on power electronics 30:4365-4376

Vidmar G, Miljavec D, AGREŽ D (2014) Measurement and evaluation of EDM bearing currents by the normalized Joule integral. Measurement science & technology 25:7:1-10

Šrekl M, Bratina B, Zagirnyak M, Benedičič B, Miljavec D (2013) Losses in the axial-flux permanent-magnet machine housing. Compel 32:4:1366-1382

Gotovac G, Lampič G, Miljavec D (2013) Analytical model of permeance variation losses in permanent magnets of the multipole synchronous machine. IEEE transactions on magnetics49:2:921-928

Stojčić B, Miljavec D (2012) Current distribution in the low-voltage winding of the furnace transformer. International journal of electrical power & energy systems 43:1:1251-1258

Study materials

1. Gieras F J (2009 ) Advancements in Electric Machines. Springer

2. Umans S (2013) Electric Machinery. McGraw-Hill Science/Engineering/Math

3.  Bianchi N (2005) Electrical Machine Analysis Using Finite Elements. Power Electronics and Applications, Taylor and Francis Press
4. Boldea I, Tutelea L N (2009) Electric Machines: Steady State, Transients, and Design with MATLAB. CRC Press

5.  Jereb P, Miljavec D (2009) Vezna teorija električnih strojev. Založba FE in FRI, Ljubljana

Bodi na tekočem

Univerza v Ljubljani, Fakulteta za elektrotehniko, Tržaška cesta 25, 1000 Ljubljana

E:  dekanat@fe.uni-lj.si T:  01 4768 411