Design and performance analysis of a brushless doubly-fed machine for stand-alone ship shaft generator systems

In this paper, a novel brushless doubly-fed machine (BDFM) with the double-sine wound rotor (DSW rotor) for stand-alone ship shaft generator application is designed. The performance studies of the prototype DSW-rotor BDFM with 4 and 2 pole pairs by using the finite element analysis model and the experimental method are presented. The magnetic fields, air-grip flux destiny distribution and the on-load characteristics of the prototype machine are investigated. The experiment results validate the theoretical analysis results and all studies in this paper show that the prototype DSW-rotor BDFM has a good performance.