Advanced Electrical Machines
Module code: EG7034
- Introduction Definition of machine and drive. Revision of mechanical principles. Mechanical loads and their characteristics.
- The basics of electromagnetic torque production for singly and doubly excited systems.
- Application of matrix methods to electrical networks, Voltage equation, Impedance matrix, Linear transformations in electric circuit analysis.
- Choice of transformation - Invariance of power, symmetrical components. Application to single phase transformer.
- The primitive machine. Frames of reference and sign conventions. Voltage equation. Impedance matrix, transformer and rotational emfs. Impedance matrix decomposition.
- Linear transformations, 3-phase to 2-phase, 2-phase to stationary axes, Brush shift.
- The form of the transient impedance matrix, Fundamental torque equations.
- Summary. Overview of Machine Analysis.
- Application to DC and other commutator machines, separately excited, compound and series connections.
- Inter-connected DC machines. Motor and generator, metadyne transformer.
- Analysis of two pole synchronous machine with salient poles. Reduction to primitive machine, impedance and torque equations. Excitation and reluctance torque.
- Poly-phase induction machines. Reduction to primitive machine, impedance and torque equations. Reading Assignment 2.
- State-space model and simulation of induction motor performance. Start-up dynamics, load application, terminal short circuit.
- Incorporation of saturation, slip dependence of rotor parameters, eddy current loss, phase sequence reversal and incorporation of mechanical system models.
- Brushless DC motors, operation, construction, design and analysis. Back-emf and torque characteristics. Radial and axial flux machines. Brushless permanent magnet generators.
- Switched Reluctance Motors, operation, design, construction, analysis. Stator and rotor pole numbers and relationship to number of phase windings. Power electronic control.
- 22 hours of lectures
- 128 hours of guided independent study
- Exam, three hours (100%)