Magnetic planar micro generator

Abstract

A prototype of an axial-flux permanent magnet electromagnetic generator was recently built in LEG in collaboration with LETI. The /spl phi/ 8 mm planar generator consists of a permanent magnet disc rotor cut out of bulk SmCo/sub 5/ or NdFeB and a silicon stator with electroplated three-phase planar coil. The machine was driven at speeds up to 260 000 rpm on hybrid magneto-pneumatic bearings. This mm-scale planar generator is compatible with mm-scale gas turbines. The article evaluates its integration for the generation of electrical power, using compressed air presently. The first prototype of micro-turbo-generator driven by compressed air delivers an electric output power of 14.6 mW at 58 000 rpm.