INTERLACED CONDUCTOR/BACK-IRON SECONDARY FOR INDUCTION MOTORS

摘要

An induction motor is provided with a secondary portion (20) comprising an interlaced conductor/back-iron (or ferromagnetic) portion (60) and a purely ferromagnetic back-iron portion (62). The interlaced portion (60) comprises an electrically conductive lattice (or foam) material (61) having pores (63) filled with a ferromagnetic material which results in two interlaced lattices (61, 63) which are continuous through a shared volume. The interlaced region (60) provides both good magnetic permeability for passing magnetic flux (30) and good electrical conductivity for flowing induced electrical currents necessary for induction motors. As a result, the effective magnetic gap (G1) is minimized while also providing a low-cost induction motor. Alternatively, the lattice (61) may be a ferromagnetic material which is embedded with a conductor.