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:
Jun. 20, 2006
Filed:
Apr. 14, 2004
Alan Jack, Northumberland, GB;
Barry Mecrow, Tine and Wear, GB;
Philip George Dickinson, Northumberland, GB;
Mats Persson, Höganäs, SE;
Chris Manning, Gateshead, GB;
Alan Jack, Northumberland, GB;
Barry Mecrow, Tine and Wear, GB;
Philip George Dickinson, Northumberland, GB;
Mats Persson, Höganäs, SE;
Chris Manning, Gateshead, GB;
Höganäs AB, Höganäs, SE;
Abstract
An essentially ring shaped core back for an electrical machine comprising a plurality of stacked, ring shaped sheets of soft magnetic material, a barrier of electrical resistance arranged between two adjacent sheets of soft magnetic material for reducing effects of eddy currents. At least each sheet of soft magnetic material in a subset of said plurality of stacked, ring shaped sheets of soft magnetic material includes a plurality of circumferentially arranged tooth openings that are extending axially through each sheet in said subset of said plurality of stacked, ring shaped sheets of soft magnetic material, additionally, each sheet of said subset of said plurality of stacked, ring shaped sheets of soft magnetic material includes a first inner closing portion and a second inner closing portion that are arranged between each tooth opening and an inner perimeter of said ring shaped sheet of soft magnetic material. Each first inner closing portion is arranged to face a corresponding second inner closing portion.