Electrical Machines I

Lectures:
Energy conversion and its use in electrical machines. Division of electrical machines. Materials used in electrical machines.
Enclosures, shapes and cooling of machines. Laws, equations, principles used in electrical machines.
Principles and description of transformers. Operating conditions. Equivalent circuit diagram. Phasor diagrams.
Three-phase transformers. Winding connections. Parallel cooperation. Special types of transformers.
Magnetic fields in rotating electrical machines. Types and functions of windings.
Importance and use of asynchronous machines. Design and basic data. Principle of function and operation state.
Energy balance of asynchronous machines. Equivalent scheme. Torque.
Starting and speed control of asynchronous motors. Asynchronous generator and brake.
Effect of harmonics on the operation of an asynchronous motor

Exercise:
Computational exercises on transformers.
Computational exercises on asynchronous machines.


Labs:
Introduction to the laboratory. Job safety. Credit conditions. Protocol requirements.
Measurements in connecting the windings of a three-phase transformer.
Measurements on the transformer (no-load, short-circuit).
Measurements at no-load and short-circuit on an asynchronous motor and measurements under load on an asynchronous motor.
Test
Credit.

Projects:
A project in this case means the preparation of laboratory reports that include wiring diagrams, measurements and evaluation of the measured results.