A method of making a cylindrical ferromagnetic body and cover assembly for a rotor of a dc motor is provided. In a first embodiment, a blend of a powdered ferromagnetic material and a heat-curable binder is compressedly molded into a cylindrical form in a generally cylindrical non-magnetic cover material...http://www.google.ca/patents/US5495658?utm_source=gb-gplus-sharePatent US5495658 - Method of making cylindrical ferromagnetic body and cover assembly for rotor of DC motor
