Patent ID: 7146708
Filing Date: 2006-12-12
Classification: B22F,H01F,H02K,Y10T

Abstract:
1. A method of making a composite electric machine rotor assembly of a desired magnetic pattern, the method comprising: forming at least one green-strength magnetically conducting segment by pressing a soft ferromagnetic powder metal in a die; forming at least one green-strength magnetically non-conducting segment by pressing a non-ferromagnetic powder metal in a die; placing the green-strength magnetically conducting segments adjacent the magnetically non-conducting segments to form a disk in the desired magnetic pattern; adding powder metal between the segments; and sintering the segments and added powder metal whereby the segments are bonded together by the added powder metal to form a sinterbonded composite disk; stacking a plurality of the sinterbonded composite disks axially on a shaft with the magnetic patterns aligned to form the composite electric machine rotor assembly.