2017/18 Undergraduate Module Catalogue
ELEC3560 Electric Drive Systems
10 creditsClass Size: 100
Module manager: Dr J. Corda
Email: j.corda@leeds.ac.uk
Taught: Semester 1 (Sep to Jan) View Timetable
Year running 2017/18
This module is mutually exclusive with
| ELEC5565M | Electric Drives |
This module is not approved as a discovery module
Objectives
The objectives of the module are:- to extend knowledge and understanding of classical electric machines
- to engage equivalent circuit representatives for modelling the drive characteristics
- to study principal methods of control in variable-speed drive systems
Learning outcomes
On completion of this module, students should be able to:
- understand relationships between voltage, current, flux, emf, torque and speed of a DC motor; explain the steady-state torque/speed characteristics under variable voltage and variable field conditions; explain the transient behaviour with rapid change of control variables; solve numerical problems;
- sketch and explain the current and voltage waveforms for thyristor control under steady-state conditions for operation with continuous and discontinuous current; explain why discontinuous current operation is undesirable and suggest methods for overcoming the problem; explain the power factor at the convertor input; solve numerical problems; understand the closed-loop control arrangements for DC drives;
- sketch and explain the current and voltage waveforms under steady-state conditions for DC chopper control, the relationship between the chopper duty cycle and speed, continuous and discontinuous current operation, impact of switching frequency; understand chopper controlled DC drive configurations for motoring and braking modes; solve numerical problems;
- explain the magnetic field spatial distribution in an idealised rotary machine with smooth airgap; explain production of rotating field in a sinusoidally supplied 3-phase idealised machine; describe the electromechanical arrangements of 3-phase induction motors; understand slip speed, rotor currents and torque production;
- understand the rotor circuit and per-phase equivalent circuit of the 3-phase induction motor; derive and explain expressions for electromagnetic torque and the torque/slip characteristics and understand stable and unstable operating regions; solve numerical problems;
- comprehend classical methods of speed control for cage and slip-ring types of induction motor drives; explain operations with motoring, generating and braking modes; explain principles of combination of variable-frequency and variable-voltage method for speed control; solve numerical problems.
Syllabus
Operating characteristics and control principles of DC motors. Steady-state characteristics and transient behaviour.
DC motor drives: Thyristor convertor controlled drives; chopper controlled drives; closed-loop control strategy for a separately excited motor.
3-phase induction motor drives: Electromagnetic arrangement and operating principles of induction machines, equivalent circuit, phasor diagram and torque/slip characteristics; operation in motoring, generating and braking modes; classical methods of speed control of cage and slip-ring induction motors; principles of the variable-voltage and variable-frequency method of speed control.
Teaching methods
| Delivery type | Number | Length hours | Student hours |
| Laboratory | 1 | 3.00 | 3.00 |
| Laboratory | 2 | 2.00 | 4.00 |
| Lecture | 22 | 1.00 | 22.00 |
| Private study hours | 71.00 | ||
| Total Contact hours | 29.00 | ||
| Total hours (100hr per 10 credits) | 100.00 | ||
Private study
11 hours - preparing lab reports60 hours - reading lectures and studying numerical examples
Opportunities for Formative Feedback
Feedback on laboratory reportsMethods of assessment
Coursework
| Assessment type | Notes | % of formal assessment |
| Report | Lab Report 1 | 10.00 |
| Report | Lab Report 2 | 10.00 |
| Total percentage (Assessment Coursework) | 20.00 | |
.
Exams
| Exam type | Exam duration | % of formal assessment |
| Standard exam (closed essays, MCQs etc) | 2 hr 00 mins | 80.00 |
| Total percentage (Assessment Exams) | 80.00 | |
Re-sits for ELEC modules are subject to the rules in the School’s Code of Practice on Assessment. Students should be aware that, for some modules, a re-sit may only be conducted on an internal basis (with tuition) in the next academic session.
Reading list
There is no reading list for this moduleLast updated: 26/04/2017
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- Undergraduate module catalogue
- Taught Postgraduate module catalogue
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- Taught Postgraduate programme catalogue
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