• 5,714,831 - Method and apparatus for improved control of piezoelectric positioners, granted Feb 1998.
• 5,659,480 - Method for coordinating motion control of a multiple axis machine, granted Aug 1997.
• 5,341,280 - Contactless coaxial winding transformer power transfer system, granted Aug 1994.
• 5,334,923 - Motor torque control method and apparatus, granted Aug 1994.
• 5,261,266 - Sensor tip for a robotic gripper and method of manufacture, granted Nov 1993.

• "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.

• "Interior permanent-magnet synchronous motor design for improving self-sensing performance at very low speed"

Wu SS, Reigosa DD, Shibukawa Y, et al., IEEE Transactions on Industry Applications 45 (6): 1939-1946 Nov-Dec 2009. The focus of this paper is to improve the self-sensing performance of an interior permanent-magnet synchronous machine (IPMSM) by modifying the rotor configurations.

• "Improved coordinated response and disturbance rejection in the critical sections of paper machines"

Valenzuela MA, Bentley JM, Aguilera PC, Lorenz RD, IEEE Transactions on Industry Applications 43 (3): 857-869 May 2007.  This paper evaluates two disturbance-rejection control techniques, one using disturbance feedforward (or disturbance input decoupling) based on a nip-pressure disturbance observer and the other using a two-degrees-of-freedom controller.

• "A current control technique for induction machine drives using integrated pilot current sensors in the low-side switches"

Chakrabarti, S, Jahns TM, Lorenz RD, IEEE Transactions on Power Electronics 22 (1): 272-281 Jan 2007.  A new current regulation algorithm is presented that achieves indirect field-oriented control (IFOC) for three-phase induction motor drives using current feedback information provided by three integrated pilot sensors in the three low-side inverter switches.

• "Disturbance torque and motion state estimation with low-resolution position interfaces using heterodyning observers"

Tesch TR, Lorenz RD, IEEE Transactions on Industry Applications 44(1): 124-134 Jan 2008.  The error mitigation strategy involves decoupling these spatial quantization harmonics from the actual fundamental position, using heterodyning tracking observer topologies. 

• Center for Power Electronics Systems
• Wisconsin Electirc Machines and Power Electronics Consortium
• Hamilton Sundstrand
• Siemens VDO Electric Drives, Inc
• University of Rome, “La Sapienza”, Department of Electrical Engineering