Unit information: Electrical Drives in 2013/14

Unit name	Electrical Drives
Unit code	EENGM7041
Credit points	10
Level of study	M/7
Teaching block(s)	Teaching Block 2 (weeks 13 - 24)
Unit director	Professor. Phil Mellor
Open unit status	Not open
Pre-requisites	EENG37000
Co-requisites	None
School/department	Department of Electrical & Electronic Engineering
Faculty	Faculty of Engineering

Description including Unit Aims

This unit builds on the previous Industrial Electronics courses EENG 27000 and EENG 37000 to investigate in more detail the performance and characteristics of electrical drives and in particular focusing on digital variable speed control of AC induction and permanent magnet machines.

Elements

Vector Based Control Prof P.H. Mellor

Review of the equivalent circuits and defining equations that describe the operation of AC machines. Discussion of the concepts of model order reduction and vector control. Develop mathematical descriptions of flux and torque control methods and their application to brushless AC permanent magnet and induction motors. Comparison with other control techniques.

Realisation in an Industrial Drive System Prof P.H. Mellor

Review the generation and characteristics of the various PWM techniques used in the voltage and flux control of AC machines. Develop typical torque and speed control structures used in AC drives and discuss their implementation. Illustrate the application of vector control through a case study on a typical industrial drive.

Sensors and Sensor-less Methods Prof P.H. Mellor

Introduce the need for sensors and the various types. Describe the operation, data processing, advantages and disadvantages of each type. Introduce position sensor-less techniques and discuss the suitability of these techniques

Intended Learning Outcomes

Having completed the Vector based control element the student will:

• Understand the use of flux and current vectors applied to the operation of brushless AC machines;
• Know how to use the benefits of vector based control to improve dynamic performance beyond other control techniques;
• Know the mathematical techniques used in the implementation of vector control in brushless AC permanent magnet and induction motor drives.

Having studied the issues surrounding the realisation of a vector controller, the student will:

• Understand the concept of the power electronic drive as an intelligent unit;
• Understand various PWM voltage generation techniques and their impact on drive system performance;
• Know the methods of implementation of vector control in a typical industrial drive.

Having completed the Sensors element the student will:

• Know the various types of position and speed sensor and their relative advantages and disadvantages;
• Understand the concept of position sensor-less

control, the key difficulties and the main techniques for its implementation in brushless permanent-magnet drives.

Teaching Information

Combination of lectures and laboratory sessions

Assessment Information

Terminal Exam 100% 2hrs

Reading and References

• Mohan, N. Underland, J.M. and Robbins, W. Power Electronics:Converters, Applications & Design (3rd edition 2003), ISBN 0-471-42908-2.

• Krishnan, R. Electric Motor Drives Modeling, Analysis and Control, ISBN 0-13-0910147, Prentice Hall.

• Bose, B.K. Modern Power electronics and AC Drives, ISBN 0-13-016743-6, Prentice Hall.

• Drury, W. (Editor), The Control Techniques Drives and Control Handbook Institution of Engineering and Technology (Jul 2001), ISBN-10: 0852967934.

• Miller, T.J.E., Brushless Permanent Magnet and Reluctance Motor Drives (Electrical & Electronic Engineering Monographs), ISBN-10: 0198593694, ISBN-13 978-019853690, Clarendon Press.

• Vas, Peter, Sensorless Vector and Direct Torque Control (Monographs in Electrical & Electronic Engineering, ISBN-10 0198564651, ISBN-13 978-0198564652, Oxford University Press.

• Vas, Peter, Vector Control of Alternating Current Machines (Electrical & Electronic Engineering Monographs), ISBN-10 0198593708, ISBN-13 978-0198593706, Clarendon Press.