ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,521,590, issued on Jan. 13, was assigned to DONGGUAN DIRECT DRIVE TECHNOLOGY Ltd. (Dongguan, China).

"Fitness device based on direct-drive motor" was invented by Di Zhang (Dongguan, China), Yanan Yu (Dongguan, China), Wang Lu (Dongguan, China) and Zhiming Zhong (Dongguan, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A fitness device includes a housing, a driving motor mounted on the housing, a fitness pull rope connected to the driving motor, and a control system connected to the driving motor. The control system comprises a main controller, a power module, a communication module, a driving circuit and a sampling module, the power module is elec...