Synchronous and Induction Machines

Course Description

Fundamentals of electrical machines: energy balance, linear current density, MMF, torque, induced voltage. Two-axis theory of electrical machines. Space vectors and coordinate transformation. Synchronous permanent magnet machines: basic operating principle, construction, phasor diagram of SPM and IPM motors, operating characteristics, testing, application in electric traction. Synchronous reluctance motor. Induction machines: general steady-state equivalent circuit, space and current harmonic effects in induction machines, synchronous and asynchronous harmonic torque components, influence of slot skew, radial forces, noise and vibration, single-phase induction motor, production technology, testing, influence of power converter.

Learning Outcomes

  1. Describe the main parts of induction machines and brushless synchronous machines
  2. Derive and explain equations describing basic physical models of induction machines and brushless synchronous machines
  3. Apply physical models to analyze the inverter-fed induction machines and brushless synchronous machines
  4. Apply theoretical knowledge in laboratory conditions

Forms of Teaching

Lectures

classical lectures using blackboard in combination with PowerPoint slides

Exercises

solving numerical examples related to the content of the lectures

Partial e-learning

posting study materials and communicating with students through the course website. Moodle quizzes for self-study.

Field work

a visit to factories which produce and test electrical machines

Laboratory

laboratory exercises using electrical machines, and accompanying power supply and measuring equipment for the purpose of practical demonstration and confirmation of the acquired theoretical knowledge

Grading Method

Continuous Assessment Exam
Type Threshold Percent of Grade Threshold Percent of Grade
Laboratory Exercises 50 % 15 % 50 % 15 %
Mid Term Exam: Written 40 % 30 % 0 %
Final Exam: Written 40 % 30 %
Final Exam: Oral 25 %
Exam: Written 50 % 50 %
Exam: Oral 35 %

Week by Week Schedule

  1. Energy balance in electromechanical systems.
  2. Linear current density and MMF. AC and polyphase MMF.
  3. Torque and induced voltage of an AC machine. Two-axis theory of electrical machines. Space vectors and coordinate transformation.
  4. Basic principle of operation and construction of permanent magnet synchronous motors.
  5. Phasor diagram for SPM and IPM motors.
  6. Operating characteristics of permanent magnet synchronous motors.
  7. Testing of permanent magnet synchronous motors. A machine with permanent magnets as a traction motor.
  8. Midterm exam
  9. Synchronous reluctance motor.
  10. Generalized induction machine equivalent circuit for steady state.
  11. Space and current harmonic effects in induction machines, synchronous and asynchronous harmonic torque components.
  12. Effect of slot skew, radial forces, noise and vibration.
  13. Induction generators (squirrel-cage, doubly-fed). Single-phase induction motors.
  14. Induction machine production technology. Testing of induction motors. Influence of power converter.
  15. Final exam

Study Programmes

University graduate
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Electrical Engineering Systems and Technologies (profile)
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Electrical Power Engineering (profile)
Elective Courses (1. semester) Elective Courses of the Profile (1. semester)
Electric Machines, Drives and Automation (profile)
(1. semester)
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Literature

Radenko Wolf (1995.), Osnove električnih strojeva, Školska knjiga, Zagreb
J. R. Hendershot, T.J. E. Miller (2010.), Design of Brushless Permanent-magnet Machines,
S. Umans, A. Fitzgerald, C. Kingsley (2014.), Electric Machinery, McGraw-Hill Companies
Ion Boldea, Syed A. Nasar (2001.), The Induction Machine Handbook, CRC Press

Laboratory exercises

For students

General

ID 222779
  Winter semester
5 ECTS
L1 English Level
L1 e-Learning
45 Lectures
15 Exercises
13 Laboratory exercises

Grading System

85 Excellent
70 Very Good
60 Good
50 Acceptable