To introduce students to a range of electrical machines (AC & DC) using the concepts of rotating magnetic fields and co-energy.

To facilitate the prediction of machine performance by the use of equivalent circuits.

(LO1) A greater understanding of how the physical laws of electromagnetism and mechanics apply to practical motors and transformers;

(LO2) A familiarity with the features of the common machines such as DC (series, shunt and brushless) and AC (synchronous and asynchronous);

(LO3) An understanding of how the physical phenomena, represented by equivalent circuit parameters, affect the device performance;

(LO4) An appreciation of relationships and similarities between different types of machine.

(LO5) An appreciation of the operating characteristics of machines.

(S1) After successfully completing the module, students should be able to show experience and enhancement of the following key skills: Independent learning, Problem solving and design skills.

(S2) After successful completion of the module, the student should be able to demonstrate practical skills in the following discipline specific areas:- The connection of a synchronous machine to a three phase, fixed frequency, AC supply (Synchronizing) using an equivalent circuit to predict the performance of various machines.

(S3) After successfully completing the module the student should:- Have the ability to translate the complex physical nature of machines into a simple equivalent circuit representation; Be able to apply the complex number theory learnt in other modules to the analysis of electrical machines; Have the ability to explain the operation of synchronous and asynchronous AC machines in terms of rotating magnetic fields.

(S4) After successfully completing the module, the student should have: A greater understanding of how the physical laws of electromagnetism and mechanics apply to practical motors and transformers; A familiarity with the features of the common machines such as DC (series, shunt and brushless) and AC (synchronous and asynchronous); An understanding of how the physical phenomena, represented by equivalent circuit parameters, affect the device performance; An appreciation of relationships and similarities between different types of machine. An appreciation of the operating characteristics of machines.

- Introduction

- Review of basic topologies, interaction of electric and magnetic circuits. Electromagnetic force in the form of B.i.l and change of co-energy.

- DC Machines Basic DC motor, machines with more than 2 poles. Series and shunt connections and characteristics and use of permanent magnet fields.  Development of the brushless DC machine, with the use of electronically switched supply to coils.

- Rotating Magnet Fields; basic concepts of space and time distribution; polyphase supplies and windings, and the generation of rotating fields. View of machines as interacting primary and secondary fields. Star & delta connections. Three phase power.

- Synchronous Machines Construction, round and salient pole fields; analysis of operation and phasor diagrams. Operating characteristics. Interaction of rotor and stator mmf; excitation and load angle. Synchronisation to supply system.

- Transformers Construction; magnetic circuits; required ma terial characteristics. Ideal transformer, referred quantities. Practical devices; leakage and magnetising reactance's. Operation and equivalent circuit; power flow.

- Induction Motors; description of 3 phase device; asynchronous nature; interaction of rotor and stator fields. Analysis based on transformer type equivalent circuit. Slip, power flow and torque. Applications and starting techniques. Description of single phase machine.

Due to Covid-19, one or more of the following delivery methods will be implemented based on the current local conditions and the situation of registered students. It is anticipated that both a) & b) will be in operation for semester 1.
(a) Hybrid delivery, with social distancing on Campus
Teaching Method 1 - On-line asynchronous lectures
Description: Lectures to explain the material
Attendance Recorded: No
Notes: On average one per week

Teaching Method 2 - Synchronous face to face tutorials
Description: Tutorials on the Assignments and Problem Sheets
Attendance Recorded: Yes
Notes: On average one per fortnight

(b) Fully online delivery and assessment
Teaching Method 1 - On-line asynchronous lectures
Description: Lectures to explain the material
Attendance Recorded: No
Notes: On average one per week

Teaching Method 2 - On-line synchronous tutorials
Description: Tutorials on the Assignments and Problem Sheets
Attendance Recorded: Yes
Notes: On average one per fortnight

(c) Standard on-campus delivery with minimal social distancing
Teaching Method 1 - Lecture
Description: Lectures to explain the material
Attendance Recorded: Yes
Notes: On average one per week

Teaching Method 2 - Tutorial
Description: Tutorials on the Assignments and Problem Sheets
Attendance Recorded: Yes
Notes: On average one per fortnight