2017/18 Taught Postgraduate Module Catalogue
ELEC5565M Electric Drives
15 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
| ELEC3560 | Electric Drive Systems |
This module is not approved as an Elective
Objectives
The objectives of the module are:- to extend understanding of classic electric machines
- to engage equivalent circuitrepresentatives for modelling drive characteristics
- to study principal methods of control in variable spedd drive systems
In addition to standard lab classes students should consolidate the understanding of lecture material by hands on experience with a chopper controlled DC motor through 3 three-hour design lab sessions.
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 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 | 5 | 3.00 | 15.00 |
| Lecture | 20 | 1.00 | 20.00 |
| Private study hours | 115.00 | ||
| Total Contact hours | 35.00 | ||
| Total hours (100hr per 10 credits) | 150.00 | ||
Private study
45 hours - preparing lab & project reports70 hours - reading lectures and studying numerical examples
Opportunities for Formative Feedback
Feedback on laboratory reportMethods of assessment
Coursework
| Assessment type | Notes | % of formal assessment |
| Report | 2 Lab Reports | 10.00 |
| Practical | Mini Project Report | 20.00 |
| Total percentage (Assessment Coursework) | 30.00 | |
.
Exams
| Exam type | Exam duration | % of formal assessment |
| Standard exam (closed essays, MCQs etc) | 3 hr 00 mins | 70.00 |
| Total percentage (Assessment Exams) | 70.00 | |
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
- Undergraduate programme catalogue
- Taught Postgraduate programme catalogue
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