Optimized design of doubly salient permanent magnet generator taking into account converter constraints

This paper presents the operation and characteristics of a doubly salient PM generator for tidal energy turbine. The behavior and the supply strategy of this unconventional machine is described. An energy ratio criterion is introduced and combined with a torque to mass ratio one for the design of such system taking into account both the generator compactness and the converter sizing. A simple method for the calculations of these two criterions is proposed. The influences of the main geometrical parameters which define the machine geometry are firstly studied. Then a multi-objective optimization process is used to optimize the two design criterions. From the calculations of these criterions for 20,000 set of geometrical parameters a Pareto front is highlighted. Several point of this Pareto front which corresponds to typical DSPM designs are presented and analyzed. The results highlight the interest of proposed method which optimize simultaneously the generator design and the converter size.