DHX Facilities


J. Rhett Mayor, PhD S. Andrew Semidey, PhD Su Mayor
Founder, President, Chief Executive Officer Co-Founder, Vice President of Technology & Innovation Co-Founder, Vice President of Operations & Marketing
Dr. J. Rhett Mayor has extensive entrepreneurial experience with product-oriented technology startups and in leading and managing advance research and development projects. As a leading academic in the field of electro-mechanical design and micro-manufacturing at the Georgia Institute of Technology, Dr. Mayor focuses on advanced electro-mechanical design efforts in power electronics cooling, electric machines design, and micro-manufacturing. Dr. Mayor has published over 80 papers in archival journals and peer-reviewed conference proceedings, and has several patents pending. He is a member of the ASME, IEEE and a senior member of the SME. Dr. S. Andrew Semidey oversees the innovation, customization, and scaling of the company’s ultra-high torque density electric motors. He holds a PhD and Bachelor of Science degree in Mechanical Engineering, from the Georgia Institute of Technology, specializing in thermal sciences. His PhD thesis addressed the thermal design and optimization of electric motors, incorporating the advanced DWHX™ cooling technology. His research work has led to several papers pertaining to the advanced modeling and estimation of the thermal response in electric machines using parametric finite-difference techniques. His work has been published in prominent conferences and journals including IEEE, IES, and ASME. Su Mayor specializes in managing the operations of high value engineering startups in addition to developing unique marketing strategies and producing media content for small to mid-size engineering companies. She has extensive experience in film and media production having worked on major studio commercials, studio film and television productions, using her experience to create all DHX media in-house. She holds a Bachelor of Commerce degree with a concentration in Economics & Finance from the University of KwaZulu-Natal, South Africa, a Bachelor of Arts in Film & Video from Georgia State University, and has completed graduate work in Applied Economics at Eastern Michigan University.
 DHX Electric Machines, Inc. is an independent, closely-held, startup company producing state-of-the-art, ultra-high torque density electric machines, incorporating the patented, proprietary micro-feature enhanced “Direct-winding Heat Exchange” DWHX™ cooling system developed in MayorLab at the George W. Woodruff School of Mechanical Engineering at Georgia Tech. The DWHX cooling system targets the cooling effect directly at the heat source, the stator windings, and with the micro-feature enhancement, effects are capable of removing up to sixteen times (16x) the heat of conventional cooling systems. Consequently, the DHX cooling systems provide a 4x increase in torque per volume that allows DHX electric machines to produce the same torque in 75% of the space of the conventional motor. DHX has industry-standard electromagnetic design FEA tools (Maxwell 2D) and custom multi-disciplinary design codes for rapid product development cycles, empowering DHX to provide custom, application-tailored motors to its customers. Founded in 2014, DHX Electric Machines, Inc. was formed by Dr. J. Rhett Mayor, Dr. S. Andrew Semidey, and Su Mayor after the successful demonstration of the DWHX™ cooled 15kW ultra-high torque density electric motor, funded by the Georgia Research Alliance via Georgia Tech's VentureLab, that validated ten years worth of research in the areas of micromanufacturing, liquid cooling technologies, portable power generation and electro-mechanical design at MayorLab. DHX relocated in 2015 from the Georgia Tech campus to Braselton, GA, moving into a 20,000 sq.ft production facility. Equipped with CNC machining centers, winding production equipment, and assembly capabilities, DHX is transitioning from technology demonstrators to batch production of motors sized up to 300kW. The company is in the early growth stage with motor offerings in the vertical traction, HVAC, power tools, and golf cart market segments. DHX looks forward to entering the markets for wind generation and boating applications soon.


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