ALEXANDRIA, Va., June 19 -- United States Patent no. 12,334,847, issued on June 17, was assigned to Hitachi Industrial Equipment Systems Co. Ltd. (Tokyo).
"Power converter apparatus" was invented by Kazuaki Tobari (Tokyo), Hironori Ohashi (Tokyo), Hiroshi Watanabe (Tokyo) and Masato Ohya (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power converter apparatus comprising: a power converter that outputs signal to the magnet motor to vary the output frequency, output voltage and output current of the magnet motor, a control unit controls the power converter, wherein the control unit calculating the gain of the magnetic flux component of the q-axis, which varies with the phase of the magnet motor, calcu...