Sizing optimization of tubular linear induction generator for a new stirling micro-cogenerator system

This article presents the design optimization of tubular linear induction generator for a new micro-CHP system powered by a free piston Stirling engine. The aim is naturally to maximize the useful electric power. First, an electromagnetic model considering a multi-layer cross section of the tubular structure is developed. Poynting vectors are calculated in order to obtain the axial force. The theoretical results are coincided with experimental measurements. Second, in the context of micro-CHP system, the linear generator is driven by the Stirling engine in an oscillatory motion Vector control of the resisting force is necessary for its operation in generator mode but also for the stability of the free piston Stirling engine. The calculation of the overall electrical efficiency is achieved in the `energy model´. The optimization process implementing genetic algorithm NSGA-II, the electromagnetic model and `energy model´ gives interesting results about the performance of tubular linear induction generator in this application.