Free Piston Stirling Cooler (FPSC) is a refrigeration system based on the Stirling cycle, utilizing free pistons instead of a crankshaft. This design reduces friction and increases efficiency and reliability. Key components include a displacer and power piston, heat exchangers, and a linear motor. The system compresses and expands a working gas (like helium) to transfer heat, functioning efficiently and environmentally friendly without traditional refrigerants. FPSCs are used in applications requiring compact, reliable cooling, such as medical refrigerators and portable coolers.