Abstract:In order to improve cooling effects of permanent magnet wind generator and reduce the operation temperature

a 3 MW permanent magnet wind generator was taken as an example

physical model of three dimensional stator and rotor fluid solid coupled was established on the basis of the basic assumptions considering ventilation characteristics and structure feature of generator

and the solution conditions was given.According to hydromechanics and heat transfer theory

temperature field and fluid field was calculated numerically using finite volume method.At the same time

some structures were proposed in view of radial ventilation ducts

and the fluid flow performance and main components temperature of different schemes were analyzed.The results indicate that

by reducing the axial size of the radial ventilation duct can effectively improve the cooling performance of the motor.The maximum temperature rise in solution was 6.04K lower than the original one when adopt schemeⅢ.