Double-Fed Induction Linear Alternator

About this technology

Overview

Innovators at NASA's Glenn Research Center have developed a lightweight, double-fed induction linear alternator capable of highly efficient extreme-environment performance. While traditional linear alternators cannot withstand temperatures of 250°C, this innovation has the ability to operate at 950°C with increased performance and efficiency. The innovation replaces the traditional permanent magnet with a copper electromagnetic Halbach circular array (essentially a 3D printed copper coil). Its simple design also eliminates iron, slip rings, and - because it is fabricated as a single piece - adhesives. As a result, it is easy to maintain, does not require iron flux containment and experiences minimal electromagnetic interference. When used with the double action extremely light thermo-acoustic (DELTA) converter, the engine/alternator system is one-tenth the weight of a traditional system. This economical alternator enables unprecedented performance for high-temperature environments such as aircraft power systems, micro combined heat and power (CHP), and downhole drilling.