Patent ID: 6856051
Filing Date: 2005-02-15
Classification: B22F,H02K,Y10T

Abstract:
1. A method of making a powder metal rotor for a circumferential type interior permanent magnet machine, the method comprising: filling a plurality of discrete first regions within an outer annular region of a disk-shaped die with a non-ferromagnetic powder metal in solid particulate form so as to leave spaces between each discrete first region; filling a plurality of discrete second regions in the outer annular region between the first regions with a soft ferromagnetic powder metal in solid particulate form so as to maintain a radially inner circumferentially extending space between each discrete first region; pressing the solid particulate form powders in the die to form a compacted powder metal disk; sintering the compacted powder metal disk; and providing permanent magnets in the radially inner circumferentially extending spaces between the discrete first regions of the outer annular region in an arrangement of alternating polarity to form a composite powder metal disk having a plurality of alternating polarity permanent magnets separated by magnetically non-conducting barrier segments and radially embedded by magnetically conducting segments.