ALEXANDRIA, Va., July 3 -- United States Patent no. 12,348,079, issued on July 1, was assigned to JFE STEEL Corp. (Tokyo).
"Motor core and method of manufacturing the same" was invented by Takaaki Tanaka (Tokyo), Tomoyuki Okubo (Tokyo) and Yoshihiko Oda (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided are a motor core having excellent fatigue resistance and a method of manufacturing the motor core at a low cost. The motor core that is an electrical-steel-sheet-stacked body has an outer peripheral surface in which an appearance ratio of recrystallized grains with a grain size of 15 micro metre or less is 70% or more of a sheet thickness of the motor core."
The patent was filed on Nov. 18, 2020,...