Ventilation and thermal improvement of radial forced air-cooled FSCW permanent magnet synchronous wind generator

Computational fluid dynamics (CFD) method is implemented to investigate the flow and heat transfer within the radial forced air-cooled fractional-slot concentrated-winding (FSCW) permanent magnet generator for decreasing ventilation loss and temperature rise. Firstly, a CFD model is established and the losses and boundary conditions are determined. Secondly, the fluid and temperature field of machines with different channel numbers and channel widths are calculated, and the ventilation and thermal performance are compared. Finally, an alternative cooling structure with radial winding holes through the slot center to dissipate heat from the winding directly, especially for the FSCW permanent magnet generators, is proposed in this paper. The results show that it is a promising alternate for decreasing the winding temperature.