Electrical Machines and Equipment

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Electrical Technology DepartmentElectrical Machines & EquipmentsElectrical MachinesDepartment Electrical Technology Major& EquipmentCourse Name DC Machines &Transformers Course Code ELT 110PrerequisitesCourse Description:This course describes two main topics: Direct current machines Transformers.This course covers construction, principles of operation,classification, equivalent circuits, parameters of evaluation,characteristics, testing and applications of DC machines, andsingle and three phase transformers.Trimester 1 2 3 4Credit Hours 4ContactHours(h/w)L 3P 2T 1General objective of the course:The course aims to give the trainees basic knowledge of construction, theory, performanceanalysis, and applications of DC machines and transformers. The course contains a practical part inwhich the trainees learn how to measure the machine parameters and performance over the workingrange.Behavioral Objectives:The trainees should be able to:1. Describe the components and construction of DC machines and transformers.2. Describe the types and characteristics of DC machines and transformers.3. Explain the methods of controlling the generated voltage of DC generators.4. Describe the methods of starting, speed control, and reversing the direction ofrotation of DC motors.5. Describe the equivalent circuit parameters of transformers.6. Distinguish three phase transformer connections.7. Name the conditions of parallel operation of transformers.Contents (Theoretical and Practical): Magnetic Circuits. DC Generators. DC Motors. Single-phase Transformers. Three-phase Transformers. Laboratory Experiments.- 28 -
Electrical Technology DepartmentElectrical Machines & EquipmentsDetailed Theoretical ContentsHours Contents Related Tasks1-Magnetic circuits4 Review of magnetic circuits: Concepts of magnetic circuits,reluctance, mmf, and flux. Analogy between electric and magnetic circuits. Representation of simple magnetic circuits.Basic knowledge122-DC Generators Construction and theory of operation of dc generators. EMF equation. Methods of excitation: Separately excited, series, shunt, andcompound. Characteristic curves and voltage regulation. Voltage buildup and critical field resistance. Losses and efficiency. Applications.B1, C1, C2, C3,C6, D5, D8, D9,E1, E3, E4, E7, E8,E9, J1, J2, J4, J5,J6103-DC Motors Theory of operation of DC motors. Back EMF, and torque equation. Torque / speed curves according to the method of excitation. Speed regulation. Methods of speed control. Methods of starting. Losses and efficiency. Applications.B1, C1, C2, C3,C6, D5, D8, D9,E1, E3, E4, E7, E8,E9, J1, J2, J4, J5,J6- 29 -
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