ALEXANDRIA, Va., June 19 -- United States Patent no. 12,334,779, issued on June 17.
"Rotor, electric motor, and rotor production method" was invented by Yuji Sasaki (Tokyo), Naoki Oiwa (Tokyo), Natsuki Yoneyama (Tokyo) and Yohei Sakakibara (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rotor includes a cylindrical magnet structure extending in an axial direction to cover a shaft, and a protective tube including a fiber body covering an outer circumferential surface of the magnet structure. The outer circumferential surface of the magnet structure has a first tapered surface gradually decreasing in diameter toward a first end surface of the magnet structure, and a second tapered surface gradually dec...