Permanent-magnet rotating machine

A permanent magnet rotating machine comprises: a housing having a cylindrical frame, a load-side bracket fixed on one end of the frame, and an anti-load-side bracket fixed on the other end of the frame, wherein an outer ring of a bearing is fitted into a circular recess of the load-side bracket; a stator formed in a cylindrical shape by stacking silicon steel plates, provided with a plurality of teeth on an inner circumferential portion thereof, and fitted into the frame of the housing with windings wound around the teeth; a rotor having a structural steel thin-walled cylindrical portion on an outer circumferential portion of which a plurality of permanent magnets are securely attached at equal intervals, a stepped circular plate portion connected to one end of the thin-walled cylindrical portion, and a shaft fixed at the center of the stepped circular plate portion, the rotor being freely rotatably supported at the load-side bracket of the housing in a cantilever manner with the stepped portion of the steppe