Robert Lorenz

Elmer and Janet Kaiser Chair and Consolidated Papers Professor of Controls Engineering


Profile Photo

Room 2025, Mech. Engr.
1513 University Avenue
Madison, WI 53706

Ph: (608) 262-5343
Fax: (608) 265-2316

Profile Summary

Robert Lorenz, a longtime professor of mechanical engineering at the University of Wisconsin-Madison, passed away on Jan. 27, 2019, after a battle with cancer. Read more: 

Co-Director of WEMPEC with 86 international sponsors, long term research and technology transfer leadership, now celebrating its 37th anniverary

With his graduate students and visiting professors and visiting scholars, Prof. Lorenz has been a: 

Pioneer in observer-based flux linkage estimation techniques yielding high accuracy, zero lag flux estimates suitable for dynamic motor torque control, self-sensing control, magnetization state control, etc.

Pioneer in observer-based self-sensing control of electric machines using rotating and pulsating vector injection methods, including design of electric machines for robust self-sensing,

Pioneer in deadbeat control of torque and flux for electric motor drives achieving the fastest possible torque dynamic while simultaneously and independently controlling flux manipulation for loss manipulation and injection-based techniques such as self-sensing with no torque ripple,

Pioneer in design and control of variable leakage flux - and variable magnetization state - electric machines to enable dynamic loss minimizing control,

Pioneer in methods for dynamically changing magnetization state at high speeds along flux linkage limits of the inverter as a volt-second source,

Pioneer in magnetization state estimation and real time control so that loss-minimizing benefits of magnetization state control can be achieved,

Pioneer in design of dynamically controlled magnetization pattern electric machines to enable torque quality (ripple) shaping while simultaneously implementing loss minimizing control,

Pioneer in integration of point field detector arrays in power electronic modules for ultra high bandwidth, galvanically isolated, non-invasive current sensing,

Pioneer in high bandwidth, non-invasive, power semiconductor junction temperature estimation using device temperature sensitive properties,         

Pioneer in dynamic ∆Tj control to actively regulate the power cycling thermal stress in power semiconductors to achieve lifetime control,

Pioneer in measurement of strain in actively switched power semiconductors, both in the semiconductor material and in the wire bond and lead frame die interconnect,

Pioneer in high efficiency coil design for MHz frequency wireless power transfer over sub-meter gaps with magnetic flux and electric field levels in the air gap that are inherently safe,

Pioneer in real-time estimation and driving cycle control of the rate-of-degradation of Lithium-ion batteries,

Pioneer in technology transfer methodologies enabling advanced university research to be successfully integrated into industrial products by distance learning, industry-based graduate students.

Update Profile