University of Malta

Study-Unit Description
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TITLE Electrical Machines

LEVEL 02 - Years 2, 3 in Modular Undergraduate Course


DEPARTMENT Industrial Electrical Power Conversion

DESCRIPTION Three Phase Synchronous Machine: Determination of parameters, operation with local loads, synchronous motors.

Three Phase Induction Motor: Equivalent circuit, power balance equations, torque and power calculations, determination of circuit parameters.

The DC Machine: Armature reaction and commutation process, performance characteristics, shunt, series, and compound motors, speed control, losses and efficiency.

Power transformers: Detailed equivalent circuits, voltage regulation and efficiency, separation of loss components, temperature variation with loading, parallel operation, specialized three phase connections.

Study-unit Aims:

This unit covers in depth the principles of operation of the most commonly used electrical machines. The unit deals with steady-state operation of the synchronous motor, the induction motor and the dc machine. The operation of power transformers is also discussed in detail.

Learning Outcomes:

1. Knowledge & Understanding:

By the end of the study-unit the student will be able to:
- Explain the principles of operation of electrical rotating machines.
- Understand the equivalent circuit for these machines and how the equivalent circuit parameters can be measured experimentally.
- Understand the operating characteristics of rotating machines.
- Explain the power loss mechanisms of rotating machines and power transformers.

2. Skills:

By the end of the study-unit the student will be able to:
- Perform calculations relating to the steady-state operation of rotating machines including torque developed, speed and efficiency.
- Perform calculations relating to steady–state transformer operation including voltage regulation, efficiency and temperature variation
- Determine the correct test conditions to identify equivalent circuit parameters of rotating machines and transformers based on name-plate data.

Main Text/s and any supplementary readings:

- Sen P.C., Principles of Electrical Machines & Power Electronics John Wiley & Sons.
- Hindmarsh John, Electrical Machines & their applications.
- Say M.G., Alternating Current Machines.

ADDITIONAL NOTES Pre-requisite Study-units: EPC1201, EPC1202

STUDY-UNIT TYPE Lecture, Practicum & Tutorial

Assessment Component/s Resit Availability Weighting
Practical No 15%
Examination (2 Hours) Yes 85%

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 2017/8, if study-unit is available during this academic year, and may be subject to change in subsequent years.

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