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B026234 - ELECTRICAL MACHINES
Main information
Teaching Language
Course Content
Suggested readings
Learning Objectives
Prerequisites
Teaching Methods
Further information
Type of Assessment
Course program
Academic Year 2016-17
Course year
First year - First Semester
Belonging Department
Information Engineering (DINFO)
Modulo di sola Frequenza of
Scientific Area
ING-IND/32 - POWER ELECTRONIC CONVERTERS, ELECTRICAL MACHINES AND DRIVES
Credits
6
Teaching Hours
48
Teaching Term
19/09/2016 ⇒ 23/12/2016
Attendance required
No
Type of Evaluation
Giudizio Finale
Course Content
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Course program
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Lectureship
Mutuality
Course teached as:
B002350 - MACCHINE ELETTRICHE
Second Cycle Degree in ENERGY ENGINEERING
B002350 - MACCHINE ELETTRICHE
Second Cycle Degree in ENERGY ENGINEERING
Teaching Language
Italian
Course Content
1) Analysis of two-phase and three-phase circuits;
2) Single-phase and three-phase transformers;
3) Synchronous machines;
4) Asynchronous machines;
4) Direct-current machines
2) Single-phase and three-phase transformers;
3) Synchronous machines;
4) Asynchronous machines;
4) Direct-current machines
Suggested readings (Search our library's catalogue)
1) A.E. Fitzgerald, C. Kingsley, and A. Kusko, " Electric Machinery", New York: McGraw-Hill Book Company, 1971.
2) L.W. Matsch and J.D. Morgan: Electromagnetic and Electromechanical Machines, New York: John Wiley & Sons, 1987.
3) S. Crepaz, "Macchine Elettriche", CittàStudi, 1997
2) L.W. Matsch and J.D. Morgan: Electromagnetic and Electromechanical Machines, New York: John Wiley & Sons, 1987.
3) S. Crepaz, "Macchine Elettriche", CittàStudi, 1997
Learning Objectives
To teach principles of AC and DC motors and generators, and transformers, and their electromagnetic, mechanical, and thermal behaviour.
Prerequisites
Good understanding of steady-state and transient analysis techniques of single-phase and three-phase circuits.
Teaching Methods
Lectures supported by ìprojector, laboratory team-works, personalized feedback and coaching to improve every aspect of the student's work.
Further information
At the end of the course a successful student should have developed a good ability to choose transformers, generators and motors for industrial applications, execute laboratory tests and determine the principal characteristics.
Type of Assessment
Intermediate tests just for students attending the course; Oral exam
Course program
1) Preliminary part:
Electromechanical energy conversion. Analysis of two-pahse and three-phase circuits. Power of two-phase and three-phase circuits.
AC circuit relationships.
2) Transformer:
Two-winding transformer. Core loss current, magnetising current. Leakage reactance. Linear equivalent circuit. Phasor diagrams. Voltage drop. Three-phase transformer connections. Open-circuit and short-circuit tests. Determination of equivalent circuit parameters. Efficiency. Auto-transformers. Instrument transformers.
3) Synchronous machine:
Cylindrical-rotor synchronous machine. Representation of airgap m.m.f. waves. Phase inductances. Mutual inductances. Vector equation of cylindrical-rotor synchronous machine. Magnetizing inductance. Synchronous inductance. Phasor equation. Steady-state equivalent circuit. Rotating magnetic fields. Vector and phasor diagram of cylindrical-rotor synchronous generator. Torque, power versus angle characteristic. Open-circuit, short-circuit, and zero power-factor tests. Potier triangle. Saturated reactances. Salient-pole machine.
3) Asynchronous machine:
Wound rotors and squirrel cage rotors. Vector equations of asynchronous machine, slip frequency. Magnetizing inductance. Steady-state equivalent circuit. Slip-torque relationship. No-load and locked rotor tests. Determination of equivalent-circuit parameters. Efficiency. Starting and braking, speed control. Variable-voltage, variable-frequency control. Brief overview about single-phase induction motors.
5) Direct-current machine:
Armature windings, field excitation, armature reaction. Interpoles, compensating winding. Separately excited machine, shunt machine, series machine, compound machine. Load characteristics of generators. Speed-torque characteristics of motors. Motor starting and braking, speed control. Variable-voltage speed control.
Electromechanical energy conversion. Analysis of two-pahse and three-phase circuits. Power of two-phase and three-phase circuits.
AC circuit relationships.
2) Transformer:
Two-winding transformer. Core loss current, magnetising current. Leakage reactance. Linear equivalent circuit. Phasor diagrams. Voltage drop. Three-phase transformer connections. Open-circuit and short-circuit tests. Determination of equivalent circuit parameters. Efficiency. Auto-transformers. Instrument transformers.
3) Synchronous machine:
Cylindrical-rotor synchronous machine. Representation of airgap m.m.f. waves. Phase inductances. Mutual inductances. Vector equation of cylindrical-rotor synchronous machine. Magnetizing inductance. Synchronous inductance. Phasor equation. Steady-state equivalent circuit. Rotating magnetic fields. Vector and phasor diagram of cylindrical-rotor synchronous generator. Torque, power versus angle characteristic. Open-circuit, short-circuit, and zero power-factor tests. Potier triangle. Saturated reactances. Salient-pole machine.
3) Asynchronous machine:
Wound rotors and squirrel cage rotors. Vector equations of asynchronous machine, slip frequency. Magnetizing inductance. Steady-state equivalent circuit. Slip-torque relationship. No-load and locked rotor tests. Determination of equivalent-circuit parameters. Efficiency. Starting and braking, speed control. Variable-voltage, variable-frequency control. Brief overview about single-phase induction motors.
5) Direct-current machine:
Armature windings, field excitation, armature reaction. Interpoles, compensating winding. Separately excited machine, shunt machine, series machine, compound machine. Load characteristics of generators. Speed-torque characteristics of motors. Motor starting and braking, speed control. Variable-voltage speed control.