Force and energy analysis of single-piston free-piston expander—linear generator

The movement of piston in free-piston expander-linear generator (FPE-LG) mainly depends on the dynamic force balance among four kinds forces (air impetus, air resistance, electromagnetic resistance and frictional resistance). In this paper, Newton's Second Law first law thermodynamics are used to analyze single-piston FPE-LG, change work produced by analyzed. Nominal work-electricity conversion loss coefficient is proposed for firs time represent energy loss. experiment results show that from top dead center (TDC) bottom (BDC) higher than those BDC TDC. minimum proportion consumption also more 50%, less 20%, 20%. Therefore, total nominal can be effectively reduced increasing intake or pressure.