Development of small stirling engine generator: article

This paper describes the basic concepts and principles of designing small Stirling engine generator. Stirling engine generator is a mechanical device that converts heat energy into electrical energy. This engine operates on a closed regenerative thermodynamic cycle, with cyclic compression and expansion of the working fluid at different temperature level [I]. Compare to ordinary fuel engine which is internally combustion, Stirling engine is external combustion engine type where the heat source is constantly supplied. The purpose of this study is to design and build small Stirling engine equipped with alternator to produce electrical output (Alternating Current power). The power output will be roughly estimated and measured at every stage of conversions. The Stirling engine built is gamma type with double heat cylinder and air is used as its working fluid. This engine produce mechanical output through flywheel and alternator is mounted on it. The alternator built is axial flux permanent magnet generator (PMG) type. The magnets used to induce current are neodymium magnet (NdFeB), the most powerful magnet on earth [2]. Power output (mechanical) from the Stirling engine will be estimated using Beale formula while alternator power output (electrical) will be estimated based on Faraday's Law.