Inverter Device and Electric Motor Drive System

摘要

An inverter device (20) according to an embodiment includes a constant power controller (8). The constant power controller (8) computes and outputs, when a value of a voltage reference to an AC motor (40) exceeds a predetermined threshold value, a d-axis current reference correction value on the basis of the value of the voltage reference and the predetermined threshold value. Moreover, the constant power controller (8) generates the d-axis current reference correction value by using a constant power model determined by a torque reference or a speed reference and a supplied direct voltage at an output switching timing determined based on a winding switching signal and outputs the d-axis current reference correction value for a predetermined time.