ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,506,423, issued on Dec. 23, was assigned to FANUC Corp. (Yamanashi, Japan).
"Motor drive device having overvoltage protection circuit" was invented by Taku Sasaki (Yamanashi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "This motor drive device comprises: a motor drive circuit that drives a synchronous motor by supplying AC power to the synchronous motor via power lines; an overvoltage protection circuit that short-circuits between the phases of the power lines by turning on a semiconductor switch when driving of the synchronous motor by the motor drive circuit is stopped and prevents the occurrence of overvoltage due to a back electromotive forc...