Module Specification

The information contained in this module specification was correct at the time of publication but may be subject to change, either during the session because of unforeseen circumstances, or following review of the module at the end of the session. Queries about the module should be directed to the member of staff with responsibility for the module.
Title Drives
Code ELEC331
Coordinator Professor S Taylor
Electrical Engineering and Electronics
S.Taylor@liverpool.ac.uk
Year CATS Level Semester CATS Value
Session 2021-22 Level 6 FHEQ First Semester 7.5

Aims

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.


Pre-requisites before taking this module (other modules and/or general educational/academic requirements):

ELEC209 ELECTRICAL CIRCUITS & POWER SYSTEMS 

Co-requisite modules:

 

Learning Outcomes

(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.


Syllabus

 

- 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.


Teaching and Learning Strategies

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


Teaching Schedule

  Lectures Seminars Tutorials Lab Practicals Fieldwork Placement Other TOTAL
Study Hours 24

        4

28
Timetable (if known)              
Private Study 47
TOTAL HOURS 75

Assessment

EXAM Duration Timing
(Semester)
% of
final
mark
Resit/resubmission
opportunity
Penalty for late
submission
Notes
(331) Written Exam There is a resit opportunity for students with extenuating circumstances. Standard UoL penalty applies for late submission. Thisis an anonymouns assessment Assessment scheduled    100       
CONTINUOUS Duration Timing
(Semester)
% of
final
mark
Resit/resubmission
opportunity
Penalty for late
submission
Notes
             

Reading List

Reading lists are managed at readinglists.liverpool.ac.uk. Click here to access the reading lists for this module.