Anthony J Jordan

US Patent:

47959363, Jan 3, 1989

Filed:

Oct 2, 1987

Appl. No.:

7/104337

Inventors:

John J. Crosetto - Orland Park IL
Kent L. Earle - Woodridge IL
Anthony D. Jordan - Barrington Hills IL

Assignee:

Midwest Dynamometer & Engineering Co. - River Grove IL

International Classification:

H02K 2114

US Classification:

310156

Abstract:

A driven rotary shaft system has a rotor including a core with a generally cylindrical surface, made from a stack of circular laminates of magnetic material which are clamped together in alignment. Permanent magnets are mounted in aligned windows formed in each laminate near diametrically opposed pole pieces for providing at least a pair of magnetic fields in positions which interact with magnetic fields of an adjacent stator. The permanent magnets and the windows have an arcuate cross section generally corresponding to the contours of the generally cylindrical surface. At least a pair of opposed air gaps are formed on diametrically opposed sides of the core, and between said pole pieces. These air gaps have internal concave contours which follow, correspond, and conform to the contours of flux lines produced by said permanent magnets. In one embodiment, the air gaps are completely within the perimeter of the circular laminates.