Inverter control method

Abstract

An inverter control method for preventing an increase or decrease fluctuation of a duty ratio of a pulse width modulation signal due to the dead time and suppressing generation of a torque ripple. A duty converter performs duty conversion on an input voltage waveform to a motor terminal voltage input circuitry to which a motor terminal voltage corresponding to each phase of an electric motor is input, and sets it as a detected duty. A command duty correction circuitry adds, to the command duty generated by a command duty generator, a differential duty that is a difference between the command duty and the detected duty, or subtracts the differential duty from the command duty, according to the direction of the phase current. Thereby, duty correction is performed to match the switching characteristics of the phase current before correction with the ideal characteristics.

Dependencies are inferred from the claim text.