HOT EXTRUSION OF FE-ND-B MAGNETS - DIRECT METHOD FOR PRODUCTION OF INTEGRATED STATORS AND ROTORS

A new approach to produce integrated magnetic devices is presented her e. The hot extrusion of a multicomponent billet can produce directly s tators or rotors for electrical engines or actuators. The different st eps of the manufacturing route and the metallurgical principles of the process are described. A review of the most important parameters is d one. Remanence of the hot extruded magnet is between 7,5 and 8 kG with a coercitivity of 15 kOe. The magnetic performances allow the economi cal use of these components in many large scale production of small el ectrical engines or actuators.