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A preliminary design of a linear alternator type dynamometer for testing of free piston Stirling engines (FPSE) with nominal output capacities between 0.5 and 3 kW has been prepared. The purpose of the dynamometer is to simulate double-acting, inertia compressors, hydraulic pumps, and linear alternators. The dynamometer will permit the experimental investigation of the steady-state dynamic and thermodynamic performance of the FPSE operating under these various load conditions. The dynamometer consists of a moving armature coil configuration for the electromechanical transducer and an active force simulation control system. Also included with the design are a magnetic field analysis for the linear alternator type electromechanical transducer and a double-acting, inertia compressor analysis.