Analytical model-based optimization of the force production capability of IPM T-LSMs: Application to wave energy conversion systems

Linear permanent magnet (PM) synchronous machines have been and continue to be viable candidates in many industrial applications where they exhibit higher performance than their rotating counterparts. In this paper, an analytical model-based optimization procedure of interior PM tubular linear synchronous machines (IPM-TLSMs) with fractional-slot-arranged winding in the armature, is developed in an attempt to enhance their electromagnetic force production capability. The proposed optimization procedure is initially-applied to an elementary concept. The force of the optimized concept is validated by a 2D finite element analysis (FEA). Then, the optimization procedure is extended to the entire machine. In spite of the force enhancement, it has been found that the machine is penalized by asymmetrical phase flux linkages. An approach to counter this limitation, through the reduction of the end effect, is proposed and validated by 2D FEA.