ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,771,222, issued on Oct. 20, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou City, China).
"Stepper motor" was invented by Lubin Mao (Changzhou, China), Wei Song (Changzhou, China) and Suntong Zhou (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a stepper motor. The stepper motor includes a rotor shaft, a steel magnet sleeved and fixed to an outer peripheral side of the rotor shaft, a winding unit sleeved to the rotor shaft, and two flexible circuit boards fixed to the winding unit. The winding unit includes two windings. Each winding includes a housing sleeved to and rotationally connected to the rotor shaft, t...