EE 283 – Electrical Machines(2)

Course lecturer :

Prof. Dr. Mohammed Yousry

Course assistant :

Eng.Dina Mohamed

Course objectives :

To study and understand the theory of synchronous machines operating in both modes generator and motor

Course description :

1. Synchronous machines: – Construction. – Principles of operation. – AC windings. 2. MMFs: – Breathing MMF. – Rotating MMF. 3. EMF calculation: – Air gap magnetic field. – Voltage induced in one coil. – Voltage induced in one phase. – Winding factors. – Voltage of the complete stator winding. – Space harmonics and winding factors. 4. Equivalent circuit: – Leakage impedance and equivalent circuit. – Circuit model. 5. The per-unit system. 6. Power and torque as related to power angle. 7. Synchronous generators: – Alternator serving an isolated load. – Alternator connected to An infinite bus. – Open-circuit characteristic. – Short-circuit characteristic. – Synchronous reactance. – Short-circuit ratio. – Calculating excitation requirements. – The Potier method of measuring leakage reactance. 8. Synchronous motors: – Synchronous motor equivalent circuit. – Motor V-curves. – Operation as a synchronous condenser. – Synchronous motor starting. – Speed control of synchronous motors. 9. Phasor diagram for synchronous machine on infinite bus (Electrical Load Diagram). 10. Salient pole machines: – Effect of saliency. – Power transfer in salient-pole machines. 11. Three-phase short circuit: – Short-circuit current. – DC component.

Course assessment :

Mid Term Exam: 20 Marks Class Work (assignments – attendance – Quizzes): 20 Marks Practical Work: 10 Marks Final Exam: 50 Marks

Recommended text books :

\”Introduction to Electrical Machines and Transformers,\” George McPherson and Robert D. Laramore, John Wiley & Sons.

Recommended refrences :

[1] \”Introduction to Electrical Machines & Transformers\” George McPherson & Robert D. Laramore, John Wiley & Sons [2] \”Electric Machinery Fundamentals, \” Stephen J. Chapman, McGraw-Hill.