Manufacturing method and composite powder metal rotor assembly for surface type permanent magnet machine

摘要

A composite powder metal disk (12) for a rotor assembly (10) in a surface permanent magnet machine. The disk (12) includes permanent magnets (20) on the surface of an inner ring (16) of magnetically conducting powder metal (33) compacted and sintered to a high density. In one embodiment, the permanent magnets (20) are separated by magnetically non-conducting powder metal (35) compacted and sintered to a high density. A rotor assembly (10) is also provided having a plurality of the composite powder metal disks (12) mounted axially along a shaft (14) with their magnetic configurations aligned. A method for making the composite powder metal disks (12) is further provided including filling a die (30) with the powder metals (33,35), compacting the powders, and sintering the compacted powders.