Patent ID: 6803694
Filing Date: 2004-10-12
Classification: B82Y,H01F,H02K

Abstract:
A low core-loss unitary amorphous metal magnetic component for an axial-flux electric machine, comprising:a. a cylinder of annular cross section having cylindrical inner and outer surfaces and two annular faces, said faces being separated by an axial thickness; b. a plurality of slots in at least one of the faces, each of said slots extending from said inner surface to said outer surface and having a depth less than said axial thickness; and c. said cylinder being comprised of spirally wound, ferromagnetic amorphous metal ribbon and being bonded by an adhesive agent, wherein said component when operated at an excitation frequency â€œfâ€  to a peak induction level Bmax has a core-loss less than â€œLâ€  wherein L is given by the formula L=0.0074 f (Bmax)1.3+0.000282 f1.5 {Bmax)2.4, said core loss, said excitation frequency and said peak induction level being measured in watts per kilogram, hertz, and teslas, respectively.