The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 1997
Filed:
Aug. 15, 1995
Zbigniew Piech, East Hampton, CT (US);
Robin M Miller, Ellington, CT (US);
John L Kettle, Vernon, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
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.