# Unit information: Electro-Mechanical Energy Conversion in 2021/22

Unit name Electro-Mechanical Energy Conversion EENG20002 10 I/5 Teaching Block 2 (weeks 13 - 24) Dr. Simpson Not open None Department of Electrical & Electronic Engineering Faculty of Engineering

## Description including Unit Aims

This unit introduces various forms of linear and rotary electromechanical energy conversion systems. The basic concepts of electromagnetic theory are revised and applied in the study of voice coil and self-excited linear and rotary actuators. An equivalent circuit model for the complete electromechanical system is developed which provides a basis for subsequent study of dynamic behaviour. The DC machine output characteristics are revised and its operation within a variable speed drive is presented. The operation of power electronic servo amplifiers and phase-controlled rectifiers are also introduced. As an introduction to the AC machine, the concept of the rotating magnetic field is discussed. Subsequent study concentrates on the asynchronous motor where its operation is described, the equivalent circuit is derived and its output characteristics under fixed and variable frequency excitation are analysed.

## Intended Learning Outcomes

Having completed this unit, a successful student will be able to:

1. Recall the ways in which energy and power are stored and determined in electrical and mechanical systems.
2. Identify different electromechanical energy transfer mechanisms and understand the underlying mechanism responsible for energy transfer within a particular system.
3. Develop models of basic linear (pseudo-static) simply excited electromechanical systems using energy methods.
4. Recognise the limitations of the linear energy methods and use a graphical method to allow for material non-linearities.
5. Formulate equivalent circuits to represent both the electrical and mechanical components of a dynamic electro-mechanical system.
6. Analyse the electrical and mechanical behaviours of voice-coil based actuators using the formulated equivalent circuits.
7. Recognise the difference between and develop equivalent circuit models of the various d.c. electrical machine topologies.
8. Understand quadrants of operations and identify the “quadrants” in which a particular electrical and electromechanical system operates within.
9. Design and analyse simple ac-dc power conversion systems.

## Teaching Information

Teaching will be delivered through a combination of synchronous and asynchronous sessions, including lectures, practical activities supported by drop-in sessions, problem sheets and self-directed exercises.

## Assessment Information

Formative: Coursework 1

Summative: Coursework 2

## Resources

If this unit has a Resource List, you will normally find a link to it in the Blackboard area for the unit. Sometimes there will be a separate link for each weekly topic.

If you are unable to access a list through Blackboard, you can also find it via the Resource Lists homepage. Search for the list by the unit name or code (e.g. EENG20002).

How much time the unit requires
Each credit equates to 10 hours of total student input. For example a 20 credit unit will take you 200 hours of study to complete. Your total learning time is made up of contact time, directed learning tasks, independent learning and assessment activity.