Electric motor controller capable of performing stable current control during load disturbance and/or a regenerating mode

摘要

In a controller for an electric vehicle, a voltage current phase difference calculating circuit calculates a vector phase theta c from a voltage command value and the primary current of an alternating current motor. The vector phase theta c is input to a second voltage command circuit which calculates a second d-axis voltage command value and a second q-axis voltage command value using the vector phase theta c and d-axis and q-axis current differences. By correcting the voltage command value using the second d-axis and second q-axis voltage command values, the stability of the current control system is improved. By controlling the electric vehicle using such a system, a stable current control can be attained even when the electric vehicle is driven under a regenerative running state or a weak magnetic field control state.