Patent ID: 7546674
Filing Date: 2009-06-16
Classification: H02K,Y10T

Abstract:
1. A method of rotor assembly without a hub comprising: stacking first rotor laminations sufficiently to form a first lamination stack having an inner diameter of substantially one predetermined size, said first lamination stack having a first end and a second end; stacking second rotor laminations sufficiently onto said second end of said first lamination stack to form a second lamination stack having an inner diameter of substantially another predetermined size to facilitate the attachment of the rotor assembly without a hub, said second lamination stack having a first end and a second end; wherein there is no central shaft extending through a center of said rotor assembly to aid construction of the rotor assembly; stacking third rotor laminations sufficiently onto said second end of said second lamination stack to form a third lamination stack having an inner diameter of said one predetermined size; wherein said first, second and third rotor laminations have a shape with substantially the same outer diameter; and wherein said second rotor laminations have a larger inner diameter than said first and third rotor laminations.