ELECTRICAL MACHINERY LABORATORY

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Learning Outcomes

explain construction and operation principle of dc motors and dc generators
Describe the working principle of a DC motor and a DC generator.
List and describe the main components of a DC generator.
Describe the operation of, and factors affecting output and direction of current flow in DC generators.
Describe the operation of, and factors affecting output power, torque, speed and direction of rotation of DC motors.
Describe the difference between motors and state the use of series wound, shunt wound and compound DC motors.
explain construction and operation principle of transformers
Describe the principle of transformer and state power losses.
Know different types of transformers.
Describe reasons for losses and determine saturation point and core losses (eddy current and hysteresis).
Describe effects of load to transformer performance.
Describe the power transfer, the factors affecting the efficiency and state the meaning of polarity markings.
Perform calculations of line and phase voltages and currents.
Perform calculations of power of three-phase system.
Describe the correlation between values of given quantities of primary and secondary (current, voltage) in terms of turns ratio and power, efficiency of a transformer.
Describe the construction and usage of autotransformer and determine the voltage and current relationship of an autotransformer.
explain construction and operation principle of ac generators.
Describe the factors affecting to the AC generator output.
Describe the working principles and state the features of both field- and armature revolved generators.
Describe the working principle of three-phase alternators.
Describe wave forms and phase differences and state features, calculate phase and line voltage.
explain the construction, features and operation principle of AC motors.
Describe the working principle of single and polyphase type AC synchronous and induction motors and state the characteristics of them.
Describe methods of speed control and direction of rotation.
Describe the main methods of producing a rotating field in a capacitor, inductor, shaded or split pole.