Study-Unit Description

Study-Unit Description


TITLE Electromechanical Drives

LEVEL 03 - Years 2, 3, 4 in Modular Undergraduate Course


DEPARTMENT Industrial Electrical Power Conversion

DESCRIPTION Electric drive system and characteristics:
Concept and classification of Electric drive systems (EDS). Differences in mechanical characteristics of electric motors. Mechanical characteristics of loads and load diagrams. Steady-state and steady-state stability of EDS. Dynamics and dynamic stability of EDS. Mechanical transient in EDS.

Four-quadrant operation of DC machines:
Theoretical background of four-quadrant operation of separately excited dc machine (SEDCM). Starting, stopping, reversing, braking and design of speed control for SEDCM.

Single-phase machines and their operational characteristics:
Induction, Universal, Repulsion Motors

Selection and rating of electric motors:
Working and environmental conditions. Torque consideration. Thermal considerations. Thermal transients under continuous duty, intermittent duty and short-time duty. Overload and rating of electric motors under variable loads.

Study-unit Aims:

To consolidate the theoretical knowledge of electrical machines, introduce the study of dynamics of electrical drives and to develop a system approach in the application of electrical machines in industrial electric drive systems.

Learning Outcomes:

1. Knowledge & Understanding:

By the end of the study-unit the student will be able to:
- Understand mechanical characteristics of electric motors and their loads.
- Understand and analyse steady-state and dynamic behaviour of electrical drive system.
- Explain and analyse dynamic behaviour of separately excited dc machine.
- Understand operation of single-phase motors.

2. Skills:

By the end of the study-unit the student will be able to:
- Design control for separately excited dc motor to meet dynamic performance specification.
- Select suitable type of motor and rating according to application requirements.

Main Text/s and any supplementary readings:

- Hindmarsh J., Electrical Machines and their Applications.
- Bose B.K., Power Electronics and AC Drives, Prentice-Hall.

ADDITIONAL NOTES Pre-requisite Study-unit: EPC2101

STUDY-UNIT TYPE Lecture, Tutorial and Project

Assessment Component/s Assessment Due Resit Availability Weighting
Report SEM2 No 5%
Presentation SEM2 No 5%
Project SEM2 No 20%
Examination (2 Hours) SEM2 Yes 70%
Important - Due to the COVID19 Pandemic the information regarding the method of assessment indicated above may have been changed. Further details have been provided by your F/I/C/S.

LECTURER/S Joseph Cilia

The University makes every effort to ensure that the published Courses Plans, Programmes of Study and Study-Unit information are complete and up-to-date at the time of publication. The University reserves the right to make changes in case errors are detected after publication.
The availability of optional units may be subject to timetabling constraints.
Units not attracting a sufficient number of registrations may be withdrawn without notice.
It should be noted that all the information in the study-unit description above applies to the academic year 2019/0, if study-unit is available during this academic year, and may be subject to change in subsequent years.