US Patent Issued to Otis Elevator on June 16 for "Apparatus and method for controlling an escalator system or an automated walkway system" (Chinese Inventors)

ALEXANDRIA, Va., June 16 -- United States Patent no. 12,654,994, issued on June 16, was assigned to Otis Elevator Co. (Farmington, Conn.).

"Apparatus and method for controlling an escalator system or an automated walkway system" was invented by Wentong Liu (Hangzhou, China), Lifei Cheng (Hangzhou, China), Zhaoxia Hu (Hangzhou, China) and Kaisheng Xu (Haining, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method includes determining a load value of a system; and determining a current operating mode of a three-phase motor in the following manner: if the load value is below a first threshold, determining a variable frequency mode as the current operating mode, if the load value is between the first thr...