SEMESTER 5

Module Aims

·         To introduce important fundamentals of electrical power machines and their applications.

·         To build fundamental knowledge of electrical power machines which may become subjects of the further studies in Introduction to Robotics, Automatic Control Engineering, and Industrial Automation and Control courses.

Module Learning Outcomes

After successful completion of the module, the learner should be able to:

 LO-1    :   Demonstrate knowledge of the principles of operations of general electrical equipment and power supply and be able to select machines for given applications based on theoretical considerations.

LO-2    :   Apply related theories and analyze the aspects of construction, principle of operation, applications, methods of speed control, and modes of operation of DC machines.

LO-3    :   Apply related theories and analyze describe the aspects of construction, principle of operation, applications, methods of speed control, and modes of operation of AC machines.

LO-4    :   Apply related theories and analyze the aspects of construction, application and operation of single phase and three phase transformers.

LO-5    :   Analyse the power and control requirements of given applications and select suitable DC or AC machines for given applications.

Module Outline

Basics of Electromagnetism: Production of magnetic fields, Ampere’s law, magnetic circuits, magnetic behavior of ferromagnetic materials, losses in a ferromagnetic core, electromechanical energy conversion principles, Faraday’s law of electromagnetic induction.

Aspects of AC power: Real, reactive, and apparent power in ac current circuits, complex power and the power triangle, power factor correction and its benefit.

Single-Phase Transformers: Construction of transformers, the ideal transformer behavior, single-phase practical transformer, equivalent circuit voltage regulation and efficiency of single-phase transformers, benefits of high voltage power transmission.

Three-Phase Power and Three-Phase Transformers: Line and phase voltages, three-phase transformers, star-delta configurations.

DC Machines: Fundamentals of DC machines: commutation, armature reaction, internally generated voltage and torque, power flow and conversion, losses and efficiency.  DC machine types: separately excited, shunt, series, compound, permanent magnet, their equivalent circuits and characteristics, speed control, efficiency, modes of operation, and applications.

Three-Phase Induction Machine: Construction of induction machines, rotating magnetic field and synchronous speed, the principle of induction motor operation, equivalent circuit, slip, power flow, torque, efficiency, torque-speed characteristics, wiring and protection, speed control methods, variable frequency drives, frequency-speed-torque calculations, and applications.

Single-Phase Induction Motor: Construction, the principle of operation, double field revolving theory, starting methods, equivalent circuit, speed control and applications.

Synchronous Machines. Excitation techniques, starting, internally generated voltage, equivalent circuits, power and torque characteristics, power flow and efficiency of synchronous generators.