A hybrid high speed electrical micromachine for micro scale power generation

This paper presents a methodology for the optimization of a new type of high speed electrical micromachine for micro scale power generation. The micromachine is integrated into the compressor of a microturbine which operates at 500,000 rpm. Because of the high energy density of fuel, the turbine-generator combination exceeds the limitations of batteries and smoothes the way for high power or long endurance applications. The micromachine is optimized for a mechanical output power of 100 W within the dimensions of the turbine. Special attention is paid to the problems caused by high speed operation and their influence on the design of the machine