Controller of rotary electric machine

A controller of rotary electric machine which controls one rotary electric machine which has plural sets of windings via switching devices, the controller of rotary electric machine comprising:

• a current detector that, for each set, detects a current flowing into the winding;
• a current command calculator that, for each set, calculates a current command value flowing into the winding;
• a voltage command calculator that, for each set, calculates a voltage command value applied to the winding, based on the current command value and a current detection value;
• a switching controller that, for each set, controls on/off the switching device, based on the voltage command value;
• and
• a voltage control value calculator that calculates, for each set, a required DC voltage which is a minimum DC power voltage required for applying a voltage according to the voltage command value to the winding, based on the voltage command value, calculates one common required DC voltage which is common to all sets, based on all sets of the required DC voltages, and changes a common voltage control value so that the common required DC voltage approaches a DC power voltage supplied to the switching devices,
• wherein the current command calculator changes each set of the current command value, based on the common voltage control value.