MOTOR

摘要

An electric motor capable of achieving improvement in the cooling efficiency of the electric motor while keeping the electric motor characteristics from being deteriorated. Radial air ducts 9 for communicating axial air ducts 7 and 8 with a gap between the stator core 2 and the rotor core 3, the so-called air gap 10, are arranged in the stator core 2 and the rotor core 3 at their portions corresponding to the range of 40% on the downstream side of the cooling air flowing through the air gap 10. Further, the size of the air gap 10 is set within the range of value satisfying a predetermined relational expression. A wedge 16 with magnetism is inserted in each of slots 15 provided in the stator core 2. <IMAGE>