this in the present invention the coils 10 11 may be directly wound on the coil wound core parts 7b on which resin for example epoxy resin coating is effected in any case since the thickness of the coil winding core parts 7b is made less than that of the ring shaped core parts 7a the outer thickness of the stator coils 10 11 can be made less than that of the prior art and hence the motor itself can be made smaller now an example of the actual motor manufactured in accordance with the present invention and an example of the comparison of its performance with that of the prior art motor will be described a rotor was manufactured in a conventional manner whose rotor core has the axial thickness the dimension 1 in fig6 of 8 mm and the outer diameter the dimension d r in fig6 of 26 8 u03c6 mm the core plates 71 and 72 as shown in fig7 were made by stamping out from a general rolled steel plate of 1 0 mm thick with respect to the core plates 71 and 72 their ring shaped parts 71a and 72a had the diameter the dimension ds in fig7 of 27 u03c6 mm their projecting ring parts 71a the thickness the dimension h 1 in fig7 of 4 mm and their core plates the total length of projecting parts 71b 72b of plates 71 72 respectively the dimension d in fig7 of 50 u03c6 mm the stator core 7 was formed by arranging two core plates.