Synchronous Machines

Recommended Prerequisites

  Asynchronous Machines.

Teaching Methods

Theoretical classes, using audiovisual aids, with detailed presentation of the concepts, principles and fundamental theories. Lectures for solving practical exercises that allow the consolidation of concepts that require a combination of different theoretical principles and promote critical thinking about the operation of different energy converters.

Laboratory classes with implementation of experimental works based on hardware modules, including treatment and interpretation of results. Accomplishment of a small hardware or software project with report delivery is also required.

Learning Outcomes

Following the asynchronous machines studied in the previous semester this course aims to provide students skills in different types of electrical synchronous machines.

During this course, it will be addressed theoretical and practical aspects concerning the operation of the classical synchronous machine (regulated excitation) and with permanent magnets.

It will be analysed the operation of these machines operating as a motor and as a generator (alternator) and some application areas are presented.

Given that the alternator with controlled excitation is the machine responsible for the production of electrical energy from turbines, the operation of this machine will be analysed when connected to an infinite bus. The operation of the machine connected to an isolated bus will also be analysed.

It is intended that students understand the configuration and operation of synchronous machines, their behaviour at steady state, and the corresponding mathematical model.

Work Placement(s)

No

Syllabus

 Module I - Synchronous machines with controlled magnetic field(Classical Theory): Fundamentals of Synchronous machines, principle of operation, equivalent circuit, open circuit and short circuit tests, phasor diagram; power and torque characteristics; PQ diagram; synchronous machine of salient poles; calculus of Xd and Xq; power transfer; parallel operation with the grid; synchronous motors and starting methods.

Module II - Permanent Magnets Synchronous Machines: machine configurations, operation as a motor or as generator, induced electromotive force, line start motor, torque and output power.

Module III - Permanent Magnet Brushless DC Machines: machine configurations, machine operation characteristics, mathematical model, induced electromotive force, machine drive, magnetic flux distribution.

Head Lecturer(s)

André Manuel dos Santos Mendes

Assessment Methods

Assessment 1
Other: 20.0%
Project: 20.0%
Frequency: 60.0%

Assessment 2
Other: 20.0%
Project: 20.0%
Exam: 60.0%

Bibliography

1.         “Electric machinery fundamentals”, Stephen J. Chapman, McGraw-Hill, Fifth Edition, 2012.

2.         “Permanent magnet synchronous and brushless DC motor drives”, R. Krishnan, CRC Press, 2010