A linear synchronous generator with a power of 30 kW for wave-power engineering

Abstract

A floating buoy absorber that allows direct conversion of wave energy into electricity using a linear generator is a simple, but promising, device for conversion of wave energy. Results of studies of direct conversion of wave energy using a moored floating point absorber and linear synchronous generator are considered in this paper. The average power and performance of a linear synchronous generator have been determined for a significant wave. An algorithm for calculations of equivalent frequencies and emf amplitudes has been suggested for a modular design of the linear synchronous generator. The analytical expressions and dependences to determine the number of pole pairs and modules, as well as the main dimensions of the machine, have been obtained. It has been concluded that it is necessary to increase the number of poles of a linear generator to obtain an efficient design with reduced weight and overall dimensions. Application of the concentrated winding and permanent magnets with a tangential position has been justified. The parameters of electromagnetic fields and the synchronous generator for different operational conditions have been determined by the finite-element method. The design data and parameters of the six-module, 16-pole SLGPM-30-16 permanent magnet linear generator with a rating power of 30 kW are considered. The design has been optimized by calculations of the electromagnetic field; as a result, a weight of the generator has been reduced and much higher specific ratings than those in similar developments and in other devices for converting ocean-wave energy have been obtained.