Rotating electric machine

摘要

An electric rotating machine includes a field permanent magnet which is permanently magnetized to N and S poles alternatively and an armature core which is arranged coaxially with the magnet and has a plurality of salient poles facing to the magnet. Poly-phase coils are wound on the root of the salient poles. By providing an indented portion at the major face of the salient pole facing the magnet, the cogging torque can be remarkably reduced, and further by providing auxiliary salient poles ripple torque can be also reduced.