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Course Outline
Introduction
Review: AC Systems and Three-Phase Circuits
- AC voltages and currents
- Effective or RMS values
- Complex numbers and phasor concepts
- Why three-phase?
- Harmonics
- Per-unit system
Review: Electromagnetics and Energy Conversion
- Magnetic fields, flux, and force
- Faraday’s Law of Induction
- Ferromagnetic materials
- Inductors and transformers
- The DC machine
Basics of AC Machines
- Elementary AC machines: air-gap MMF, flux, voltage waveforms
- Distributed stator windings
- Elementary rotor-stator coupling
- Three-phase operation
Induction Motors: Steady State
- Induction machine types: wound rotor, “squirrel cage” rotor
- Circuit models
- Concept of slip
- Torque-speed curves
Synchronous Machines: Steady State
- Synchronous machine types: wound rotor, permanent magnet
- Circuit models and vector diagrams
- Capability curves
Converter Power Electronics: Basic Theory, Devices
- Review of circuit fundamentals
- Basic converters
- Conversion stages
- Device characteristics and capabilities
AC Inverter Basics: VSI, CSI, Modulation
- Basic inverter system
- Voltage source inverter (VSI)
- Current source inverter (CSI)
- Modulation techniques
- Pulse width modulation (PWM)
- Practical considerations
Adjustable Speed Drives: Basics
- Basic adjustable speed drive systems
- Review: DC machine speed control
- Varying voltage
- Varying frequency
- Motor and drive selection
Adjustable Speed Drives: Volts/Hz Control
- Concepts of constant flux and torque
- Operation at constant torque or power
- Low speed operation
- Basic Volts-per-Hertz system
- Drive limitations
Adjustable Torque Drives: Basics
- Ideal adjustable torque systems
- Review: DC machine torque control
- Key elements of torque control
- Synchronous machine torque
- Induction machine torque-slip control
Induction Motor Field Orientation
- Review machine forces: Lorentz and reluctance
- Rotating vectors: stator and rotor currents
- Lorentz force control = vector control
- AC current regulation
- IM slip and torque production
Application-Specific Selection of Machine-and-Drive Systems
- Load types and characteristics
- Specific drives to suit application
- Practical issues of machine and drive selection
- PM versus IM
- Installation considerations
Application of Wide Bandgap Devices to Power Electronics
- Review of Silicon Carbide (SiC) and Gallium Nitride (GaN) devices
- DC-DC converter example using SiC
- 2-level VSI using SiC and GaN inverters
High-Speed Electric Machines
- Review of high speed electric machines
- Sizing equation and definition of tip speed
- Pros and cons of each machine for high speed
- High-speed machine design considerations
Instructors and Program Director
Instructors
Thomas Jahns
Grainger Professor of Power Electronics And Electric Machines
Dr. Thomas M. Jahns received his bachelors, masters, and doctoral degrees from MIT, all in electrical engineering.
Dr. Jahns joined the faculty of the University of Wisconsin-Madison in 1998 in the Department of Electrical and Computer Engineering. He served for 14 years as a Co-Director of the Wisconsin Electric Machines and Power Electronics Consortium (WEMPEC), a world-renowned university/industry consortium in the electrical power engineering field. Since 2021, he is the Grainger Emeritus Professor of Power Electronics and Electrical Machines.
Prior to coming to UW-Madison, Dr. Jahns worked at GE Corporate Research and Development (now GE Global Research) in Niskayuna, NY, for 15 years, where he pursued new power electronics and motor drive technology in a variety of research and management positions. His current research interests at UW-Madison include integrated motor drives and electrified propulsion for both land vehicles and aircraft.
Dr. Jahns is a Fellow of IEEE. He received the 2005 IEEE Nikola Tesla Technical Field Award “for pioneering contributions to the design and application of AC permanent magnet machines”. Dr. Jahns is a Past President of the IEEE Power Electronics Society. He was elected to the US National Academy of Engineering in 2015 and received the IEEE Medal in Power Engineering in 2022.
Michael Ryan
President
Michael Ryan received his B.S. in Electrical Engineering from the University of Connecticut, Storrs,1988, M.E. degree in Electrical Engineering from Rensselaer Polytechnic Institute, Troy, NY, 1992, and Ph.D. in Electrical Engineering from the University of Wisconsin-Madison, 1997. At UW-Madison, Ryan worked in the WEMPEC labs on projects including dc–dc converters, variable-speed generation systems, and UPS inverter control.
Ryan is President of Ryan Consulting, involved in the application of Power Electronics and Controls, particularly for Alternative Energy systems. He has held prior positions at Capstone Turbine, General Electric Corporate Research and Development and Defense Systems divisions, Automated Dynamics, Otis Elevator, and Hamilton Standard.
Renato Amorin Torres
Researcher
Renato Amorim Torres received the B.Sc. degree in electrical engineering from the Federal University of Minas Gerais, Belo Horizonte, Brazil, in 2016, and the M.S. and Ph.D. degrees in electrical engineering from the University of Wisconsin–Madison, Madison, WI, USA, in 2020 and 2022, respectively. During his M.S. and Ph.D. studies, he was a Research Assistant with the Wisconsin Electric Machines and Power Electronics Consortium (WEMPEC). Since completing his Ph.D., he has been working as a Researcher in Electric Machines and Drive Systems at General Motors Research and Development. His research interests includes power electronics and electric machines with focus areas on machine controls, wide-bandgap power devices, power electronics integration and EMI.
Erick Oberstar
Program Director
Dr. Oberstar is a Program Director with InterPro and has over 28 years of engineering and entrepreneurial experiences. At InterPro he manages programs for and teaches in the areas of AI/ML, Electrification, and Mechatronics. He has extensive experience in embedded real time control systems, signal and image processing, robotics, automation, medical devices. He managed the UW-Madison Mechatronics Laboratory for 22 years where he taught courses in mechatronics, manufacturing automation, automatic controls, and discrete time controls.
He has previous technical roles as a Scientist in the Department of Medical Physics at UW, consultant for St. Jude Medical, and electrical engineer for Orbital Technologies Corporation and Automation Components. His numerous entrepreneurial experiences include working on blood flow quantification, night vision, bacterial detection, robotics, automation, and general product development.
Dr. Oberstar has a Ph.D in Biomedical Engineering and MS in Electrical and Computer Engineering (WEMPEC) from UW-Madison, and a BS Electrical Engineering from UW-Platteville. He has over 30 publications with over 400 citations and three patents. Dr. Oberstar is a Wisconsin Professional Engineer, Harvey Spangler Award for Technology Enhanced Education winner and judge, as well as a SPIE member and senior member of IEEE.
Patrick Flannery
Associate Teaching Professor
Patrick Flannery received the B.S. degree in mechanical engineering from The Pennsylvania State University in 1998, and the M.S. and Ph.D. degrees in electrical engineering from the University of Wisconsin, Madison, in 2003 and 2008, respectively. Patrick is presently an Associate Teaching Professor in the Electrical and Computer Engineering Department at University of Wisconsin Madison. Previously he served as Director of Research Engineering with American Superconductor (AMSC) where he was technical lead of several product developments projects for military electronics, grid connected power electronics, wind generator control systems.Brent Gagas
Staff Systems Engineer
Brent Gagas received his B.S. (2011) M.S. (2013) and PhD (2016) in Mechanical Engineering all from the University of Wisconsin-Madison, where he was a Research Assistant in WEMPEC under Dr. Robert Lorenz, focusing his research on dynamic magnetization state manipulation and loss minimizing control of variable flux permanent magnet motors.Since graduating, Brent has worked at General Motors, currently as a Staff Systems Engineer, focusing motor and power electronic controls in automotive propulsion systems and has achieved 20 patents and the 2021 Boss Kettering award.Program Director
Erick Oberstar