Electrical Machines II

Recommended Prerequisites

Applied Electrotechnics, Electric Machines I

Teaching Methods

Theoretical classes with detailed presentation, using audiovisual means, of the concepts, principles and fundamental theories about the topics covered in the curricular unit. Besides the theoretical aspects, these classes include the resolution of problems and exercises that illustrate the practical interest of the topics covered and exemplify its application to real cases in the engineering world.

Learning Outcomes

Is intended that students acquire skills in the following topics: (i) synchronous machines (classic theory) – principle of operation; steady-state analysis; selection and application; (ii) dc current machines – constitution, principle of operation and steady-state analysis; (iii) single-phase induction motors – steady-state operation.

Work Placement(s)

No

Syllabus

Part I – Synchronous machines (classic theory): equivalent circuit, no-load and short-circuit tests; voltage phasor diagram; magnetization curve and short-circuit characteristic; torque and power curves as a function of load angle; PQ diagram; salient-pole synchronous machine; calculation of Xd and Xq; power transfer;  parallel operation with the grid; synchronous motors; starting methods of synchronous motors.

Part II – DC current machine: constitution and working principle; armature induced voltage; equivalent circuit; types of excitation; steady-state analysis as a motor and generator.

Part III – Single-phase induction machine: constitution, working principle and applications; starting methods and torque curve as a function of speed; equivalent circuit; steady-state analysis.

Head Lecturer(s)

André Manuel dos Santos Mendes

Assessment Methods

Assessment
Laboratory test : 25.0%
Two midterm tests: 75.0%

Bibliography

S. Chapman (2012), Electric Machinery Fundamentals, 5th edition, McGraw-Hill, New York.

A. Fitzgerald, C. Kingsley, S. Umans (2003), Electric Machinery, 6th edition, McGraw-Hill, New York.

G. McPherson and R. D. Laramore (1990), An Introduction to Electrical Machines and Transformers, 2nd edition, John Wiley & Sons, New York.