ALEXANDRIA, Va., June 16 -- United States Patent no. 12,308,717, issued on May 20, was assigned to DONG GUAN CITY MAO SHENG ELECTRONIC INDUSTRIES LTD. (Dong Guan, China).
"Energy-saving three-phase brushless direct-current machine" was invented by Kun-Sheng Wang (Dong Guan, China) and Yu Yang (DongGuan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A brushless direct-current machine is provided, comprising a casing; a body in the casing; a motor in the body; a stator coil bidirectionally wound through slots but not empty slots; and a set of planetary gears. The duty ratio of pulse-width modulation is adjusted by using the three-phase windings of the stator coil to change a current flowing through. A c...