ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,388,384, issued on Aug. 12, was assigned to Fanuc Corp. (Yamanashi, Japan).
"Synchronous motor control device" was invented by Kenji Takahashi (Yamanashi, Japan) and Tomohisa Tsutsumi (Yamanashi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A synchronous motor control device for controlling driving of a synchronous motor through sensorless control includes a DC excitation instruction generation unit that generates an instruction for supplying, to the synchronous motor, fixed excitation current having a current phase fixed; a torque zero equivalence detection unit that detects, on the basis of data relating to voltage or current control on the sy...