EEE3201 : Electrical Machines and Generators
- Offered for Year: 2017/18
- Module Leader(s): Dr Naayagi Ramasamy
- Owning School: Engineering
- Teaching Location: Singapore
|Semester 1 Credit Value:||10|
Completion of the steady state analysis of electrical machines and generators and an extension to their dynamic performance.
Outline Of Syllabus
• Salient pole Synchronous Machine -dq approach:
DQ axis reactance models, salient pole phasor diagrams, torque and power calculations, reluctance and excitation torque, voltage and current fed performance, wound rotor and PM types.
• Circuit analysis of electrical machines:
Development of circuit models from dc machine and synchronous machine routs. Impedance matrix; instantaneous and phasor variables; real-coil and pseudostationary coil machines; expressions for torque and power, transformation of variables with power invariance, examples; general two-axis machine. Extension of two axis models to induction motors and links to the steady state per phase model.
• Parks equations and two-axis equivalent circuits:
Derivation of Parks equation and dq equivalent circuits for a general two-axis machine.
• Single Phase Induction Motor:
Analysis of simple single phase salient pole induction motor; derivation of equivalent circuit showing forward and backward wave effects; torque characteristics, f and b components; practical methods of improving starting characteristics: capacitor motor, shaded pole motor, split phase motor.
• Transient behaviour of machine
Transients in dc machine, time constants, distinction between electromechanical and electrical transients, linearization concepts, numerical methods.
• Electrical transients effects in ac machines using a sudden symmetrical short circuit in a synchronous machine as an example; transient and sub-transient reactances and time constants, engineering importance; discussion of behaviour in physical terms, with reference to equivalent circuits.
• Electromechanical transients in ac machines, natural oscillation frequencies.
• Reluctance Machines:
Synchronous reactance, stepping motors and switched reluctance machines, principles of operation and models for operating characteristics.
|Guided Independent Study||Assessment preparation and completion||1||2:00||2:00||Final examination.|
|Guided Independent Study||Assessment preparation and completion||12||1:00||12:00||Revision for final examination.|
|Scheduled Learning And Teaching Activities||Lecture||24||1:00||24:00||N/A|
|Guided Independent Study||Assessment preparation and completion||1||8:00||8:00||Case study|
|Guided Independent Study||Independent study||54||1:00||54:00||Reviewing lecture notes; general reading; solving problems.|
Teaching Rationale And Relationship
Lectures provide the core material and guidance for further reading, problem solving and practice are integrated into the lecture structure. The case study will allow the students to gain a deeper understanding of the characteristics and principles of the electrical machines being studied, and an ability to link the mathematical models developed to the electrical machine operation.
The format of resits will be determined by the Board of Examiners
|Case study||1||M||15||1000 word case study|
Assessment Rationale And Relationship
The examination allows student to demonstrate their problem solving skills together with their knowledge and understanding of the subject outlined in the lectures. The case study enables students to demonstrate that they are able to apply this understanding and their analytical skills to find solutions.
- Reading List Website : rlo.ncl.ac.uk