Patent ID: 6437473
Filing Date: 2002-08-20
Classification: H02K,Y10T

Abstract:
A method for producing a rotor for an electric motor comprising:providing a stack of a plurality of laminations of a magnetic material; forming a plurality of windows in said stack of laminations along its axis, each window having an end portion radially of the rotor center, each window having an end to be at the peripheral edge of its respective lamination, there being an intermediate region of a lamination between the ends of two of said windows that are adjacent, each lamination initially having an annular radial extension beyond what is to be its final peripheral edge; applying an adhesive material into the axial windows; inserting into each axial window a magnetic element; mounting an end cap to each end of the lamination stack; curing the adhesive material; removing said annular radial extension of the laminations of the stack so that said end portion of each of said plurality of windows is at the peripheral edges of the laminations and form a polar portion between a respective window and the peripheral edges of the laminations of the stack and an intermediate peripheral portion between two adjacent polar peripheral portions, said intermediate peripheral portion having reduced electrical conductibility and reduced magnetic permeability in relation to the core.