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A tubular yokeless linear permanent-magnet (PM) machine is proposed for free-piston energy converter (FPEC), where high mass and volume power density are required. Topology, operating principle, design, and optimization of the tubular yokeless linear PM machine are studied. With the quasi-sinusoidal speed characteristic of the resonant piston considered, a single-phase yokeless linear PM machine is...
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...
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