MODELING AND CONTROL OF ELECTROMECHANICAL SYSTEMS
Academic Year 2024/2025 - Teacher: Giuseppe SCARCELLAExpected Learning Outcomes
The course aims to provide students with the fundamentals of modeling, operating principles and control of electrical and electromechanical energy conversion systems, the main basic knowledge and future developments. Particular attention will be paid to experimental activities carried out in the laboratory that aim to improve practical skills.
The knowledge acquired during the course will allow the knowledge of the operation of the most common electromechanical actuators and their control methods.
Course Structure
Required Prerequisites
Knowledge of the basic concepts of physics and electronics.
Attendance of Lessons
Detailed Course Content
The objective of this course is modeling and control the electromechanical systems (mainly rotating electrical machines: conventional and special) used in the conversion of electrical in mechanical energy and vice-versa. The course will give basic and advanced elements of two fields of the electrical engineering area taught in the courses of Electrical Machines and Electrical Drives Emphasis is placed on electromagnetic rotating machinery, by means of which the bulk of this energy conversion takes place. However, the techniques developed are generally applicable to electrical machines, renewable energy conversion and to a wide range of additional devices including linear machines, actuators, and sensors.
Although not an electromechanical-energy-conversion device, the transformer is an important component to understand the overall energy-conversion process that uses magnetic field. The models developed for transformers analysis form the basis for the ensuing discussion of rotating electric machinery. Finally Generalized Theory and Space Vector Theory are introduced to better explain Vector Control of AC Machines.
Summary of the course program
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Università di Catania 15/09/23, 09:54
First part: Electromechanical systems.
Energy balance and conservative systems: determination of electromagnetic forces and torques. Power: active, reactive and apparent power. Three-phase systems. General information on electrical machines: materials, losses, efficiency, thermal behavior. Transformer: principle of operation, equivalent circuit, no- load and short-circuit tests; HF transformers. Asynchronous machine: MMF of distributed windings and equations, pole pairs, equivalent circuit, slip, electromagnetic torque.
Second part: Rotating machines.
Asynchronous machine: no-load and locked-rotor tests, starting, single-phase induction motors. Power Electronics: Rectifiers, Choppers. Converters for DC and AC electrical machines. Control of electromechanical systems: Electrical drives. DC servo-machines: commutator action, load operation, DC motors, shunt excitation generators, series excitation motors. Digital modulation techniques: PWM, space vector. VSI and CSI. DC and AC motor drives: Scalar control. Current control. Constant V by f control. Vector Control of asynchronous machines: IFOC, DFOC: VI, I-omega, I-theta. Synchronous machine: equivalent circuit, load angle, synchronous and reluctance torque.
Third part: Special machines, SMART-GRIDs, MICRO-GRIDs.
Special synchronous machines: Permanent Magnet (PM) motors, Synchronous Reluctance (SyncRel) motors, stepper motors, switched reluctance motors, Brushless DC motors. Vector control of synchronous and PM machines. Universal motors. Stepper motors. Switched reluctance motor control. Distributed and renewable energy generation. Drives for electric traction, electric and hybrid vehicles.
Textbook Information
A.E. Fitzgerarld: “Electric Machinery”, Mc Graw Hill.
P. Krause: “Analisys of Elelectrical Machines”, IEEE Press.
N. Mohan: "Power Electronics", Hoeply.
B. Bose: “Power Electronics and Variable Frequency Drives”, IEEE Press.
T. Wildi: “Electrical Machines, Drives and Power Systems”, Pearson Prentice Hall.
Course Planning
Subjects | Text References | |
---|---|---|
1 | Modeling. Fundamentals of electrotechnical basic principles. | B. Bose “Power Electronics and Variable Frequency Drives”, IEEE Press. |
2 | Electrical machines. | A.E. Fitzgerarld: “Electric Machinery”, Mc Graw Hill. |
3 | Electrical drives. | T. Wildi: “Electrical Machines, Drives and Power Systems”, Pearson Prentice Hall. |
Learning Assessment
Learning Assessment Procedures
Examples of frequently asked questions and / or exercises
Characteristic and operating principles of the most common electric machines: DC, Induction, Synchronous, PM, Switched Reluctance.
Generalized theory. Scalar and vector control.