NORTH CAROLINA STATE UNIVERSITY
Department of Mechanical and Aerospace Engineering
MAE/ECE 535
Design of Electromechanical Systems
Summer 2007
Website: www.mae.ncsu.edu/courses/mae535/buckner
Dr. Gregory D. Buckner
E-mail: gbuckner@eos.ncsu.edu
COURSE DESCRIPTION
A practical introduction to electromechanical systems with emphasis on modeling, analysis,
design, and control techniques. Provides theory and practical tools for the design of electric
machines (standard motors, linear actuators, magnetic bearings, etc). Involves some selfdirected laboratory work and culminates in an industrial design project.
COURSE TOPICS
Electric and magnetic field theory, magnetic circuit analysis, electromechanical energy
conversion, generalized machine theory, modeling and simulation, design and control
considerations.
COURSE OBJECTIVES
Students completing this course will be able to:
1. Understand the fundamentals of electromagnetism (Maxwell's equations) and apply them to
standard problems;
2. Apply magnetic circuit analysis to predict the electromagnetic characteristics of electric
machines; utilize finite element analysis to predict magnetic fluxes, forces, and torques in
electric machines;
3. Understand the fundamentals of permanent magnetism and select permanent magnet materials
for specific applications;
4. Understand the principles of electromechanical energy conversion and apply these principles
to predict forces and torques in electric machines;
5. Develop nonlinear dynamic models of electric machines, simulate these systems using Matlab
and Simulink, and analyze their performance and response characteristics;
6. Explain the fundamentals (machine topology, etc.) and basic operating characteristics (torque,
speed, efficiency, etc.) of common electrical machines;
7. Design, model, simulate, and control common (dc motors, induction motors, etc.) and unique
(railguns, active magnetic bearings, etc.) electric machines
COURSES NOTES (REQUIRED): AVAILABLE FROM THE NCSU BOOKSTORES
REFERENCE TEXTS (OPTIONAL): BOTH ON RESERVE IN THE D.H. HILL LIBRARY)
M.N. Sadiku, Elements of Electromagnetics, Third Edition, Oxford University Press, 2001
A.E. Fitzgerald, C. Kingsley, and S.D. Ulmans, Electric Machinery, Sixth Edition, McGrawHill, 2003
GRADING
Homework
Midterm Exam
Design Project
Final Exam
25%
25%
25%
25%
Note: late homework will not be accepted!
GRADING SCALES
A+ 99-100
B+ 91-92
C+ 82-84
D+ 68-69
A 95-98
B 87-90
C 73-81
D 64-67
A- 93-94
B- 85-86
C- 70-72
D- 62-63
OTHER
¾
This course deals extensively with the fundamentals of problem solving… class
attendance and attention to homework are highly recommended.
¾
Late homework will not be accepted.
¾
Academic dishonesty rules, as outlined in the NCSU Code of Student Conduct, will be
strictly enforced.
¾
Students are encouraged to work in small groups and use additional reference materials for
the solution of homework assignments. However, copying and submitting the work of
other students as your own is a violation of the NCSU Code of Student Conduct, and
will be treated as such.
¾
Any student with a disability who is registered with the University Office of Student
Disability Services should schedule an appointment with Dr. Buckner at the beginning of
the semester to discuss academic accommodations.
¾
Video copies of each lecture will be posted on the course website
(www.mae.ncsu.edu/courses/mae535/buckner) within 24 hours of the lecture.
¾
A standard course evaluation survey will be administered at the end of this course.
TENTATIVE SCHEDULE
Week
May 21
May 28
June 4
June 11
June 18
June 25
July 9
July 16
July 23
July 30
August 1
August 6
Topics
Introduction
Course objectives, overview, and policies
Fundamentals of Electromagnetics: Maxwell’s Equations
Static electric fields: Coulomb’s Law, Gauss’s Law,
visualizing fields and potentials, capacitance
Electric currents: Ohm’s Law, Continuity Equation
Static magnetic fields: conservation of flux, Biot-Savart’s
Law, Lorentz’s force equation,
Ampere’s Law
Faraday’s Law, inductance
Summary of Maxwell’s equations
Electromagnetics Demonstrations
Magnetic Circuit Theory
Magnetic circuits: theory and applications
Finite Element Analysis for EM Circuits
Introduction to FEA
2D using FEMM, 3D using MAXWELL
Permanent Magnets
Magnetic hysteresis, coercivity, load lines, flux leakage
Midterm Exam
Design Projects Assigned
Electromechanical Energy Conversion
Conservation of energy, energy and coenergy, force and
torque in EM machines
Generalized Machine Theory
Analysis of standard rotating machines using GMT
Common Electric Machines
Induction motors, synchronous motors, reluctance motors
Modeling and Simulation
Modeling and simulation of EM systems
Nonlinear analysis: linearization and Simulink
Transient and steady-state dynamics
Control of Electric Machines
PID, Pole Placement, Nonlinear Control
Design Considerations for Electric Machines
Iron Losses, Copper Losses, Flux Saturation
Case studies: Design and Control of EM Machines
Design, analysis, and control - active magnetic bearings,
railguns, etc.
Conclusion
Course Evaluation
Design Projects Due
Final Exam
Optional
Reading
S 4.1-4.10
S 6.5
S 5.1-5.8
S 7.1-7.2
S 7.3-7.6
S 8.1-8.2
S 9.1-9.3,8.8
S 9.5
F 1.1 - 1.3
S 8.10
S 15.5
FEMM User
F 1.5 - 1.6
S 8.5-8.6
F 3.1 - 3.6
F 4.1 - 4.11
F 5,6,7,8
F 3.8 - 3.9