ELECTRICAL MACHINERY

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Learning Outcomes

The student will be able to explain the basic electrical concepts
Defines the concepts of magnetic field, magnetic field strength, permeability, magnetic flux density, flux, saturation point.
Describes the concepts of magnetic circuits, magnetomotive force.
Describes magnetic behavior of ferromagnetic materials, energy losses in a ferromagnetic core, eddy current, hysteresis loop, residual flux, coercive force reluctance and retentivity.
Describe units and can calculations of magnetism and describe losses
Describe the precautions when handling magnets.
The student will be able to 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.
Describe the principle of a Starter Generator.
The sudent will be able to 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 the methods to prevent them.
Describe effects of load to transformer performance.
Describe the power transfer, 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.
The student will be able to explain construction and operation principle of ac generators.
Describe the rotation of loop in a magnetic field and waveform produced.
Describe the factors affecting to the AC generator output.
Describe the working principles of both type generator and state the features of both field- and armature revolved generators.
Describe the working principle of all alternators (single-phase, two- phase and three-phase), waveforms and phase differences.
State features and calculate phase and line voltage in three-phase star and delta connections, advantages and uses.
Describe the main working principle of Permanent Magnet Generator and know uses.
The student will be able to 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: capacitor, inductor, shaded or split pole.