The inverter control device

PROBLEM TO BE SOLVED: To provide an inverter control device comprising a low capacity capacitor which optimizes the efficiency of an electric motor drive system by utilizing an electric motor with an increased ratio of reluctance torque and controlling regenerative energy from the electric motor.SOLUTION: Drive control means 6 of the inverter control device comprising a low capacity capacitor 32 comprises: a magnetic flux estimation section 17 for estimating an interlinkage magnetic flux of an electric motor 5 with an increased ratio of reluctance torque on the basis of an armature current of the electric motor 5 detected from current detection means 7; and a current phase difference adjustment section 14 for adjusting a phase difference of the current from an induced voltage generated by the electric motor 5. The current phase difference adjustment means makes a phase adjustment such that the interlinkage magnetic flux estimate value estimated by the magnetic flux estimation section 17 becomes a predetermined set value or less and that at least any one of an average value of a current command value given to the electric motor 5, an average value of an effective value of the armature current detected from the current detection means 7 and an average value of a peak value of the armature current becomes a minimum value.