The new type of direct drive permanent magnet wind turbine generator as the research object, in the completion of the XLPE high voltage cable is used as stator windings of the 1.5MW/10.5kV new type of direct drive permanent magnet rotor based on the electromagnetic design of wind turbine generator, a two-dimensional model in Ansoft under the environment of Maxwell, finite element simulation and analysis of electromagnetic field of the generator under various conditions, including static no load, rated load, asymmetric short circuit fault of generator, permanent magnet in the outlet end of sudden three-phase short circuit current affected by impact will occur partial demagnetization analysis, validate the feasibility of design scheme of new type of permanent magnetic wind power generator. The results show that, the traditional model of wind generator and permanent magnet wind generator electromagnetic field distribution, and the high rated voltage, current density, and the single phase short circuit rated load under the condition of the magnetic field of the permanent magnet armature magnetic field by the impact is small, the copper loss and iron loss is smaller, at the same time, in the extreme case of a short circuit will not be permanent magnet part also, the design scheme is feasible.