Thrust optimization of a five-phase fault-tolerant flux-switching linear synchronous motor

Linear permanent magnet machines have been increasingly used in several applications that require high reliability and good dynamic characteristics. In this paper, a novel double-sided design of a 5φ permanent magnet flux-switching linear synchronous machine (FSLSM) with a yokeless translator is proposed. The proposed design is analyzed using finite-element methods and is found to have high thrust and low cogging force. It is shown that thrust ripples of less than 1% is achievable by redesigning the currents. The proposed 5φ machine is optimized using individual parameter optimization and is compared with results from global optimization using genetic algorithm (GA). The machine is analyzed for different open-circuit fault conditions and it is found that by including the reluctance component of the thrust, thrust ripples under fault can be minimized. The proposed FSLSM is most suitable for long-stroke applications and intermittent oscillatory type applications especially when safety is a critical factor.