## Electrical Machines I

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Course Unit Code Number of ECTS Credits Allocated Type of Course Unit * Level of Course Unit * Year of Study * 410-2207/01 6 ECTS credits Compulsory First Cycle Second Year Summer Semester Face-to-face Czech Course succeeds to compulsory courses of previous semester BER30 Ing. Petr Bernat, Ph.D. KAC37 doc. Ing. Petr Kačor, Ph.D. In the course students become familiar with dividing ot electric machines, with electrical materials and basic laws for electric machines. Basic principles of transformers and asynchronous machines and their operation characteristics are discussed. Students become familiar also with basic rules of winding. During laboratory excercises the operation states of electric machines are measured. The course objectives is to master theory of transformers and asynchronous machines, their properties and utilization. Then to master basic measurements of operation characteristics of machines. Lectures: 1) Types of electric machines. Materials used by electric machines design. 2) Windings in electric machines 3) Enclosure, shape and cooling. Laws, equations and methods used in electric machines. 4) Principle and description of transformers. Operation states. Equivalent circuit. Phasor diagrams. 5) Three-phase transformers. Winding connection. Operation in parallel. Special types of transformers. 6) Magnetic field of electric machines. Types and function of winding. 7) Use of asynchronous machines. Design types and foundation dates. Function and operation state. 8) Energy bilance of asynchronous machines. Equivalent circuit. Torque. 9) Circle diagram of asynchronous machine. 10) Starting and speed control of asynchronous motors. 11) Asynchronous generator and brake. 12) Single phase induction motors. 13) Influence of harmonics on a asynchronous machines running. Exercises: Calculation excercise 1 of transformers. Calculation excercise 2 of transformers. Calculation excercise 1 of asynchronous machines. Calculation excercise 2 of asynchronous machines - circle diagram design Calculation excercise 3 of asynchronous machines. Laboratories: Familirization with laboratory practice, safety training, mark condition Transformer measurement(no-load, short-circuit). Measurement by three-phase transformer winding connection. No-load test and locked-rotor test of asynchronous motor and load test of asynchronous motor. Test Credit. Projects: Project consists of elaboration of protocols from laboratory exercises, with values, diagrams and evaluation of results. Hindmarsh,J.: Electrical Machines and their Applications, Oxford,1970 Keppert, S., Čermák, T.: Transformátory, skriptum VŠB Ostrava, 1984 Keppert, S.: Asynchronní stroje, skriptum VŠB Ostrava, 1984 Petrov,G.N.: El. stroje 1 a 2, ACADEMIA 1980 Bašta J. a kol.: Teorie el. strojů, SNTL/ALFA 1968 Hindmarsh,J.: Electrical Machines and their Applications, Oxford,1970 Keppert, S., Čermák, T.: Transformátory, skriptum VŠB Ostrava, 1984 Keppert, S.: Asynchronní stroje, skriptum VŠB Ostrava, 1984 Petrov,G.N.: El. stroje 1 a 2, ACADEMIA 1980 Bašta J. a kol.: Teorie el. strojů, SNTL/ALFA 1968 Lectures, Tutorials, Experimental work in labs, Other activities Credit and Examination Credit and Examination 100 (100) 51 Credit Credit 45 25 Examination Examination 55 6