# Unit information: Electrical Drives in 2019/20

Please note: Due to alternative arrangements for teaching and assessment in place from 18 March 2020 to mitigate against the restrictions in place due to COVID-19, information shown for 2019/20 may not always be accurate.

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Unit name Electrical Drives EENGM7041 10 M/7 Teaching Block 2 (weeks 13 - 24) Professor. Phil Mellor Not open EENG37000 None Department of Electrical & Electronic Engineering Faculty of Engineering

## Description

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.

Vector Based Control

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

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

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 unit the student will:

1. Apply flux and current vectors to the operation of brushless AC machines;
2. Use vector based control to improve dynamic performance beyond other control techniques;
3. Recall the mathematical techniques used in the implementation of vector control in brushless AC permanent magnet and induction motor drives.
4. Explain the concept of the power electronic drive as an intelligent unit;
5. Explain various PWM voltage generation techniques and their impact on drive system performance;
6. Describe the methods of implementation of vector control in a typical industrial drive.
7. List the various types of position and speed sensor and their relative advantages and disadvantages;
8. Explain the concept of position sensor-less control, the key difficulties and the main techniques for its implementation in brushless permanent-magnet drives.

Lectures

## Assessment Details

Exam, 2 hours, 100% (All ILOs)