ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,463,576, issued on Nov. 4, was assigned to HITACHI ASTEMO LTD. (Hitachinaka, Japan).
"Inverter control device and inverter control method" was invented by Shigehisa Aoyagi (Hitachinaka, Japan), Takafumi Hara (Tokyo) and Takaya Tsukagoshi (Hitachinaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An inverter control device performs pulse width modulation by selecting one of a synchronous pulse control mode in which a frequency of a carrier wave used in the pulse width modulation is changed in accordance with a rotation speed of the motor and an asynchronous pulse control mode in which the frequency of the carrier wave is constant regardless of the...