ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,460,380, issued on Nov. 4, was assigned to HITACHI CONSTRUCTION MACHINERY Co. LTD. (Tokyo).
"Electric work machine" was invented by Akira Watanabe (Ushiku, Japan), Ken Takeuchi (Kasumigaura, Japan), Yuki Makimura (Tsuchiura, Japan), Kenta Tanigaki (Abiko, Japan) and Seiji Ishida (Hitachinaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A control device of an electric hydraulic excavator sets or computes a rotation speed command an allowable torque of an electric motor on the basis of a required rotation speed of the electric motor, and a sum of a suppliable electric power of a converter and a battery suppliable electric power. An inverter of the...