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:
Oct. 22, 2019
Filed:
May. 01, 2017
Williams International Co., L.l.c., Walled Lake, MI (US);
David A. Sculthorpe, White Lake, MI (US);
Geoffrey R. Madden, Plymouth, MI (US);
WILLIAMS INTERNATIONAL CO., L.L.C., Pontiac, MI (US);
Abstract
A magnetic core is assembled from a plurality of electrical-steel laminations staked together by respective plug and socket portions of respective adjacent interlocks at locations that experience relatively-low magnetic flux density rate. An electrically-insulating-coating is placed on abutting lamination surfaces either before or after blanking the laminations, or after partially piercing the interlocks, prior to stacking and pressing the laminations together to form the magnetic core. The magnetic core is annealed in a non-oxidizing environment at a first temperature for a first period of time, and then cooled to a second temperature at a controlled rate of cooling. The first temperature is sufficiently high to prospectively cause fusion between adjacent laminations if not protected by the electrically-insulating-coating. The annealed magnetic core is heated in an oxidizing environment at a third temperature for a second period of time to develop one or more oxide layers between each pair of adjacent laminations.