Optimization on thrust ripple of an axial-flux permanent-magnet linear synchronous machine

This paper focuses on decreasing the thrust ripple of an axial-flux permanent-magnet linear synchronous machine (PMLSM) used for free-piston Stirling engines. A typical 1kW machine with 10 poles and 9 slots is investigated. By finite-element method (FEM), detent force and thrust ripple are analyzed for different axial and radial dimensions of the end stator tooth. Meanwhile, the similar trends of no-load detent force and load thrust ripple has been found. To verify the proposed method, prototype machine was manufactured and tested.