Learning Outcomes:
On successful completion of this module, students will be able to:
1. Apply phasor analysis to single-phase and three-phase AC circuits, including star (Y) and delta (Δ) configurations, to compute voltages, currents, and power components (active, reactive, and apparent).
2. Interpret magnetic circuit behavior using B-H curves and understand the effects of hysteresis and eddy currents in magnetic materials.
3. Explain the construction and working principles of induction machines, including distributed windings, flux relationships, torque-speed characteristics, and their modelling using equivalent circuits.
4. Evaluate the performance of induction machines under various conditions, including rotor resistance variation, speed control methods, and generator operation—particularly in wind energy applications with voltage source inverters.
5. Describe the operation of synchronous machines, including steady-state performance, connection to infinite bus systems, speed control, and renewable energy integration.
6. Differentiate between special electrical machines such as BLDC, PMSM, SRM, SynRM, and stepper motors in terms of construction, control, and their applications—especially in electric vehicle traction systems.
Indicative Module Content:
AC Circuit Analysis: Phasor analysis of single-phase and three-phase circuits, Star (Y) and Delta (Δ) connections, Phase and line voltages and currents, Active, reactive, and apparent power, Power factor and RMS values.
Magnetic Circuits and Energy Conversion: Magnetic characteristics of materials (B-H curves, hysteresis, eddy currents), Analysis of magnetic circuits and electrical analogies, Faraday’s law and sinusoidal excitation, Principles of electromagnetic energy conversion.
Induction Machines: Construction and working principles, Distributed windings, flux linkage, and inductance, Rotating magnetic, Torque-speed characteristics, efficiency, and rotor resistance effects, Starting methods and speed control, Induction generator operation and applications in wind energy systems, Integration with Voltage Source Inverters (VSIs).
Synchronous Machines: Construction and equivalent circuit, Steady-state performance and infinite bus operation, Speed control and voltage regulation, Applications in renewable energy systems and VSI-based interfaces.
Special Electric Machines: Brushless DC (BLDC) motors: structure, operation, Hall sensors, VSI control, Permanent Magnet Synchronous Motors (PMSM), Switched Reluctance Motors (SRM), Synchronous Reluctance Motors (SynRM), Stepper motors, Applications in electric vehicle traction systems.