Modeling and analysis of tubular flux-switching permanent magnet linear generator with hybrid cores for stirling generator

The hybrid magnetic core can combine the advantages of two or more magnetic materials, enhancing machine performance while reducing core loss under determined working condition. By combining soft magnetic composite (SMC) materials and silicon sheets, a tubular flux-switching permanent magnet linear generator (TFSPMLG) with a hybrid magnetic core is designed. In order to validate the advantages of the hybrid magnetic core, the performances of TFSPMLG with different kinds of cores are analyzed by finite element method (FEM). Based on the piston motion characteristics of a free-piston Stirling engine, a comparative performance analysis was conducted on the output voltage, output power, losses, and efficiency of TFSPMLG with hybrid magnetic core under different oscillation frequency of the mover. The losses calculated by FEM were employed in the thermal field analysis, and the temperature distribution of TFSPMLG under rated load operation was obtained.