2015/16 Undergraduate Module Catalogue
ELEC3560 Electric Drive Systems
10 creditsClass Size: 120
Module manager: Dr J. Corda
Email: j.corda@leeds.ac.uk
Taught: Semester 1 (Sep to Jan) View Timetable
Year running 2015/16
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 comprehend 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 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;
- describe 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; classic methods of speed control of cage and slip-ring induction motors; principles of variable-voltage and variable-frequency method of speed control.
Teaching methods
Delivery type | Number | Length hours | Student hours |
Laboratory | 2 | 3.00 | 6.00 |
Lecture | 20 | 1.00 | 20.00 |
Private study hours | 74.00 | ||
Total Contact hours | 26.00 | ||
Total hours (100hr per 10 credits) | 100.00 |
Private study
12 hours - preparing lab reports62 hours - reading lectures and studying numerical examples
Opportunities for Formative Feedback
- Feedback on laboratory report- Test
Methods of assessment
Coursework
Assessment type | Notes | % of formal assessment |
Report | 2 xLaboratory Log Book & Progress Reports | 20.00 |
Total percentage (Assessment Coursework) | 20.00 |
Normally resits will be assessed by the same methodology as the first attempt, unless otherwise stated
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 |
Normally resits will be assessed by the same methodology as the first attempt, unless otherwise stated
Reading list
The reading list is available from the Library websiteLast updated: 11/04/2016
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