Wisconsin Discovery Portal

Researcher: Thomas Jahns

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Areas of Research Expertise
* Power electronics
* Power semiconductors
* Switching circuit topologies
* Electric machines and actuators
* Digital real-time control
* Sensors
* Adjustable-speed drives
* Brushless motor drives and generators
* Automotive and aerospace electric systems
Web Site University Web Page of Thomas Jahns
Curriculum Vitae (CV)
Current/Active Funding
  • NREL, 2010-2013, Development of Advanced Modeling Tools for Thermal Characterization of Electric Machines in Support of Advanced Electric Traction Drive
  • WARF, 2009-2034, Lab Share Account
  • WI Office of Energy Independence, 2010-2012, CRES MOU
  • UWF, 2011-2099, ELEC. MACH & DRIVES RES. FUND
  • Mult. Donors, 2001-2099, UW FUTURE ENERGY CHALLENGE TEAM
  • Department of Energy, 2010-2013, MOU with State of Wisconsin for Center for Renewable Energy Systems
  • DOE, National Energy Technology Laboratory, 2012-2016, Scalable, Low-Cost, High-Performance Non-Rare-Earth PM Motor for Hybrid Vehicles
  • Wisconsin Energy Research Consortium, 2011-2013, Integration of Second-Life Batteries into an EV Charging Station with Renewable Energy Sources
  • Johnson Controls, 2012-2013, Development of Improved Status Estimation Algorithms for Batteries and Ultracapacitors in Demanding Applications includiing Stop-Start Operation
  • Wisconsin Energy Research Consortium, 2012-2013, Planning and Design of Advanced Microgrid Testbed Facilities in Milwaukee and Madison
Issued Patent(s)
  • 6,909,620 - Inverter configurations with shoot-through immunity, granted July 2005.
  • 5,986,419 - Quadrature axis winding for sensorless rotor angular position control of single phase permanent magnet motor, granted Nov 1999.
  • 5,838,127 - Single phase motor for laundering apparatus, granted Nov 1998.
  • 5,289,107 - Switched reluctance generator system with fault recovery capability, granted Feb 1994
USPTO Published Applications
Recent Publication(s)
  • "Scalar PWM algorithms for four-switch three-phase inverters"

An QT, Sun L, Zhao K, et al., Electronics Letters 46 (13): 900-U48 Jun 2010.  Four-switch three-phase inverters (FSTPIs) have been proposed to be used in low-cost applications because of the reduced number of semiconductor devices, and space vector pulse width modulation (SVPWM) techniques have also been introduced to control FSTPIs.  The simulation and experimental results demonstrate the validity of the proposed method.

  • "Analysis of negative-saliency permanent-magnet machines"

Moncada RH, Tapia JA, Jahns TM, IEEE Transactions on Industrial Electronics 57 (1): 122-127 Jan 2010. In this paper, a negative-saliency permanent-magnet (PM) synchronous machine analysis is presented.

  • "Winding inductances of fractional slot surface-mounted permanent magnet brushless machines"

El-Refaie AM, Zhu ZQ, Jahns TM, Howe D, Compel-The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 28(6): 1590-1606 2009. 

  • "Observer-based control methods for combined source-voltage harmonics and unbalance disturbances in PWM voltage-source converters "

Lee K, Jahns TM, Lipo TA, et al., IEEE Transactions on Industry Applications 45 (6): 2010-2021 Nov-Dec 2009. In this paper, computationally efficient sinusoidal-disturbance estimation and elimination methods are introduced into the control of an active front end (AFE) voltage-source converter (VSC) to achieve effective disturbance rejection in high power systems with slower pulsewidth-modulation switching frequencies (e.g., 5 kHz) and limited current-controller bandwidth.

Recent Artistic Works  
  • Wisconsin Electric Machines and Power Electronics Consortium
  • Eaton Corporation, Kevin Lee
  • GM Advanced Technology Center, Sibaprasad Chakrabarti
  • Electric Machine Drive System Department, Ford Motor Company, Hongrae Kim
  • Virginia Polytechnic Institute
Research Tools  
Research Facilities  
E-mail Address [email protected]
Phone Number (608) 262-5702
Current University UW - Madison
Department Electrical and Computer Engineering
Title Professor
Other Appointments  
Address Line 1 2559 Engineering Hall
Address Line 2 1415 Engineering Drive
City Madison
State WI
Zip Code 53706
Bachelor's Degree
Master's Degree
PhD PhD, Massachusetts Institute of Technology, 1978
Other Degrees
Technologies Available for Licensing