Authorised by Academic Registrar, April 1996
Objectives To develop the fundamental principles of electrical machines.
Synopsis Magnetic circuits: equivalent circuit; magnetisation curve; losses, sinusoidal excitation. Energy conversion: Faraday's Law; electromagnetic and electromechanical conversion; torque developed; generator and motor operation (DC-AC). Balanced three-phase circuits: balanced voltages (Y delta connection); three-phase loads; power calculations and measurement. Transformers: single-phase transformer; effect of winding resistance; components of magnetic flux; equivalent circuit; testing, regulation; efficiency; per-unit system. Performance and control of DC machines. 3[phi] induction motors; construction; slip, rotor power; induced e.m.f.; torque; losses and efficiency. Synchronous generators: basic operation; e.m.f. equation; equivalent circuit.
Assessment Examination: 60% + Class tests, assignments and laboratory work: 40%