Founded in 1996, Reading-based Duryea Technologies designs and manufactures brushless DC motors, power electronics, generators and rotary engines in the United States. Its niche is engineered-to-order systems for OEMs, built around proprietary low-voltage SolidSlot motor technology and flexible production that runs from prototypes to low- and mid-volume manufacturing. Duryea also develops practical energy systems such as the MODE biogas generator for farms and wastewater-treatment plants.
D&D Motor Systems, IncFrom its Syracuse, New York manufacturing plant, D&D Motor Systems makes high-performance DC motors and controllers for electric vehicles and specialized equipment. Founded by Michael and Eric Dieroff, the company brings more than 50 years of combined expertise to custom drive-system engineering, motor testing, and in-house manufacturing. Its U.S.-made products are used in applications ranging from golf carts and neighborhood electric vehicles to airport support and hydraulic equipment.MILFORD, OH
D Tech ServiceFounded in Glastonbury in 1979 by Dennis and Mary Alice Tulimieri, D Tech Service designs and manufactures electrical motor-control systems while providing engineering and factory-trained field service for VFDs. Now operating from a 40-person Cromwell facility under three longtime employees who purchased the company in 2022, it supports customers across New England and the New York region with custom, tested systems and round-the-clock service. Its facility is ISO 9001:2015 and UL 508A certified.ROCKVILLE, MD
Freedom MotorsWith more than 40 years of research behind it, Freedom Motors is a Dixon, California, engineering company known for developing rotary-engine technology. Its Rotapower® engines are built for customers seeking compact, lightweight power, with current work focused on custom engines and advancing the technology toward broader production.MANSFIELD, OH
Combined Energies, LLCBased in upstate New York, Combined Energies designs and manufactures patented specialty power electronics for clean-energy systems, including its Marathon LR DC-to-DC converter. Initially developed for fuel-cell applications, the company’s technology is built to manage variable low-voltage sources while improving conversion efficiency and reducing system size and cost. Combined Energies also draws on 30 years of experience designing and integrating residential-scale high-temperature PEM fuel-cell systems.ROCHESTER, NY