The highfrequency AC current in the winding of intelligent stator cage multiphase motor leads to the eddy current, proximity effect and skin effect. The influence of different factors on the AC loss is investigated. A finite element software is used to establish the model of the motor and analyze the proximity effect and skin effect of the winding. The influences of the slot size, conductor position and crosssectional area on the AC loss are investigated. The AC loss of different pole pairs and materials is studied. The obtained results show that the AC loss can be reduced by changing the slot size, conductor crosssectional area and winding material.