ALEXANDRIA, Va., June 17 -- United States Patent no. 12,316,250, issued on May 27, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).
"Power tool" was invented by Yanqing Xu (Nanjing, China), Dezhong Yang (Nanjing, China) and Hongwei Wang (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power tool includes a motor, a power supply device, a driver circuit, a parameter acquisition module, and a controller. The motor includes a stator and a rotor. The motor is configured to generate a reluctance torque. The driver circuit is electrically connected to the motor to drive the motor. The parameter acquisition module is configured to acquire a current of the motor, a rotational speed...