Company Filing History:
Years Active: 2004-2014
Title: Rex Liebert Allison, III: Innovator in Brushless DC Motor Technology
Introduction
Rex Liebert Allison, III is a notable inventor based in Santa Clara, California. He has made significant contributions to the field of electrical engineering, particularly in the development of technologies related to brushless direct-current motors. With a total of six patents to his name, Allison's work has had a lasting impact on motor control systems.
Latest Patents
One of Allison's latest patents is titled "Sample and hold time stamp for sensing zero crossing of back electromotive force in 3-phase brushless DC motors." This innovative technology utilizes a microcontroller to determine the rotor position of a brushless DC motor by identifying the time of zero crossing of back electromotive force (EMF) from the non-driven phase winding. The zero crossing point is established by interpolating voltage differentials that are time-stamped. Each voltage differential represents the difference between the phase voltage of the phase winding and the motor neutral point voltage. Notably, the time of zero crossing is determined without the use of a comparator and without interrupting the processor at each zero crossing point. The processor independently interpolates the time of zero crossing, regardless of when the zero crossing occurs. A hold signal conductor connects both to a sample and hold circuit and to the load input lead of a time stamp register. The microcontroller captures a phase voltage in the sample and hold circuit and a timer count in the time stamp register simultaneously.
Career Highlights
Throughout his career, Rex Liebert Allison, III has worked with prominent companies in the technology sector. He has been associated with National Semiconductor Corporation and IXYS Corporation, where he contributed to various innovative projects. His expertise in motor control systems has positioned him as a valuable asset in the field.
Collaborations
Allison has collaborated with several professionals in his field, including Jeffrey Robert Perry and Martin Garrison. These collaborations have further enhanced his work and contributed to the advancement of technology in motor control systems.
Conclusion
Rex Liebert Allison, III is a distinguished inventor whose work in brushless DC motor technology has paved the way for advancements in motor control systems. His innovative patents and collaborations reflect his commitment to engineering excellence and innovation.