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ELB045 Electrical Power and Machines

This section shows main aspects of the module ELB045 Electrical Power and Machines.


The aims of this module are:

(1) To give students a basic understanding of electrical technology as used in mechanical engineering applications.

(2) To introduce electrical machines and power systems and their practical applications, supported by practical analysis/synthesis methods of sufficient mathematical depth.

Intended Learning Outcomes

At the end of the module the student should be able to:
(1) Knowledge and Understanding
Analyse ac circuits using complex numbers, and be able to use phasor diagrams in the analysis of ac power
circuits. and the analysis of three phase circuits. Understand how the transformers, induction motors,
synchronous generators and dc motors work and be able to use them in industrial applications.
(2) Skills and Attributes
(i) Intellectual
Analyse complex electrical networks (ac and dc), and predict the performance of electrical machines. This
ability is fundamental for the students with mechanical engineering background, to be able to handle
electromechanical problems encountered in real life situations.
(ii) Practical
Test a single phase transformer to determine its equivalent circuit parameters and compare the theoretical
results with practical results under load conditions. Know the safety precautions that need to be taken into
account when testing electrical plant and equipment.
(iii) Transferable
- Test electrical plant equipment (transformers, motors, generators).
- Apply methods of ac circuit analysis to other more complex networks.
- Analyse of three phase power networks.
- Design electromechanical power conversion systems.
- Write technical reports.


- Importance of electrical supplies
- Impedance represented by complex numbers
- Phasor notation
- Calculating ac voltages and currents using phasor diagrams and complex numbers
- Maximum power transfer
- 3-phase AC circuits (balanced and unbalanced)
- Star-and Delta connected loads
- Transformers
- Transformer equivalent circuit
- Principles of electrical machines
- Torque generation
- Direct Current motors and their control
- Induction motors and their equivalent circuit
- Speed control of induction motors
- Maximum torque of induction motors
- Single-phase induction motors
- Synchronous motors and generators
- Motion control: Torque, speed and position control

Teaching and Learning

Activity  Type
Practical Classes and workshop
Guided independent study
Total student effort for the module: 100 hours on average.

2 Lectures and 1 tutorial per week for 12 weeks. 4 hours of laboratories.

Remaining 60 hours are for self study, writing coursework and revision for examinations.


Assessment Type
Exam Length
One two-hour written examination paper (80%) and one coursework laboratory report (20%).


BRADLEY, D. A. (David A.)., 1994. Basic electrical power and machines. Chapman and Hall.

FRASER, C. J. (Charles J.), Milne, J. S., 1994. Integrated electrical and electronic engineering for mechanical engineers. McGraw-Hill.

WARNES, L. A. A., 2002. Electronic and electrical engineering : principles and practice /. Palgrave Macmillan,. WARNES, L. A. A.,
2002. Electronic and electrical engineering : principles and practice /. Palgrave Macmillan,.


Lecture Plan -Brief-


LECTURE 0: Module presentation.

LECTURE 1: Summary of DC Circuits.

LECTURE 2: Summary of DC Transients and Steady State.

LECTURE 3: Steady state DC circuits with RLC.

LECTURE 4: Steady state AC circuits with XL, XC and Z.

LECTURE 5: AC Circuit Analysis and Resonance.

LECTURE 6: Thevenin's Equivalent Circuit (TEC) , DC and AC.

LECTURE 7: Norton's Equivalent Circuit (NEC), DC and AC.

LECTURE 8: Maximum Power Transfer - DC AND AC circuits.

LECTURE 9: Single Phase Transformer.

LECTURE 10: Use of Transformer for Maximum Power Transfer.

LECTURE 11: equivalent circuit of a transformer.

LECTURE 12: Magnetic Circuit Analysis, Energy and Force Equations.

LECTURE 13: Eddy Current and Hysteresis Losses.

LECTURE 14: Rotating Magnetic Field and Introduction to Induction Motors.

LECTURE 15: Induction Motors and Their Torque Speed Characteristics.

LECTURE 16: DC Machines.

LECTURE 17: Fundamentals of AC Generators.

LECTURE 18 Three Phase Circuits - Star Connection.

LECTURE 19 Three Phase Circuits- Delta Connection.

LECTURE 20: Synchronous generator and Loads.

LECTURE 21: Revisions.

LECTURE 22: Solution of a Past Exam Paper.