Patent ID: 6655004
Filing Date: 2003-12-02
Classification: B22F,H02K,Y10T

Abstract:
A method of making a powder metal rotor for a surface permanent magnet machine, the method comprising:filling an inner annular region of a disk-shaped die with a soft ferromagnetic powder metal; filling discrete regions within an outer annular region of the die with a non-ferromagnetic powder metal so as to leave spaces between each discrete region; pressing the soft ferromagnetic and non-ferromagnetic powder metals in the die to form a compacted powder metal disk; sintering the compacted powder metal disk; and providing permanent magnets in the spaces between the discrete regions of the outer annular region in an arrangement of alternating polarity to form a composite powder metal disk having an inner annular magnetically conducting segment and an outer annular segment of a plurality of alternating polarity permanent magnets separated by magnetically non-conducting segments.