Patent attributes
A method of assembling a rotor assembly is provided, without the use of a rotor steel hub. The method comprises forming first, second and third lamination stacks by stacking individual rotor laminations together. The first, second and third lamination stacks are cast to lock the individual rotor laminations together. The rotor laminations in the first, second and third lamination stacks have a generally ring-like shape with a variable inner diameter and a substantially common outer diameter. The rotor laminations in the first, second and third lamination stacks have substantially the same outer diameter, whereas the rotor laminations in the second lamination stack have a substantially larger inner diameter than the first and third rotor laminations. The elimination of the hub results in reducing total cost and manufacturing cycle time, and in improved features, performance and efficiency of the rotor assembly.
