Abstract: A two-piece motor stator having; a generally annular inner iron stator core having a plurality of teeth extending radially outwardly from outer surface thereof, an annular outer iron stator core having slots in the inner surface thereof for receiving tip portions of the teeth, and coils provided around body portions of the teeth respectively before the inner and outer iron cores are combined together by press fitting, wherein the outer iron stator core has a plurality of channels made in the inner surface, the channels being formed along each of the slots for absorbing stress resulting from press fitting the tip portions into the slots in order to reduce the degree of deformation of the inner and outer stator iron cores. The channels may be made in the tip portions of the teeth instead of the inner surface of the outer iron stator. The channels also may be filled with a deformable and magnetically soft material.