Patent ID: 7750522
Filing Date: 2010-07-06
Classification: H02K,Y10T

Abstract:
1. A direct-drive generator assembly comprising: a rotor including a rotor mount having a top flange; and a plurality of permanent magnet assemblies lining an inside surface of said rotor mount, wherein each permanent magnet assembly includes a plurality of individual magnets arranged in rows and columns and attached to a plate, such that adjacent columns of magnets have alternating polarity to stagger magnetic skew of each column with respect to a magnetic pole of the rotor and the plate is secured to the rotor mount; a stator having a stator mount and a stator lamination stack, and said stator is rotatably connected and mounted within said rotor, wherein said stator and rotor are separated by an air gap between said permanent magnet assembly and said stator lamination stack and the air gap is variable during rotation of said rotor; wherein application of an input torque to the generator via said top flange of said rotor mount produces a first cogging torque in a first direction that is offset by a second cogging torque in a second opposite direction.