ALEXANDRIA, Va., June 5 -- United States Patent no. 12,278,543, issued on April 15, was assigned to TOYOTA JIDOSHA K.K. (Toyota, Japan).
"Rotor for electric motor" was invented by Kenichiro Hayashi (Ohbu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rotor including a shaft, and a rotor core fixed on an outer circumferential surface of the shaft, with a key portion provided in an inner circumferential surface of the rotor core being fitted in a keyway provided in the outer circumferential surface of the shaft. The key portion includes an opposed part opposed to the keyway, wherein the opposed part is constituted by a core bottom portion, a core inclined portion and a core curved portion of the inner...