Design optimization of a direct-drive PMSG considering the torque-speed profile Application for Offshore wind energy

This paper presents an optimal design methodology taking speed and torque profiles into account for permanent magnet synchronous generators (PMSGs). This method, based on the d-q axis equivalent circuit model, allows to optimize both the time-dependent control parameters and the design with a reduced computation time. The case of a 10-MW direct-driven Permanent Magnet Generator for an Offshore wind turbine has been chosen to illustrate this method. The design objective is to minimize the masse as well as the average electric losses over all working points. Thermal and magnetic models are validated by a finite element analysis (FEA).