Drive device for rotating electric machine and drive method for rotating electric machine

A drive device for a rotating electric machine having a stator including stator windings for three or more phases and a rotor including a permanent magnet, the drive device comprising:

• a power conversion circuit which converts DC power inputted from a power supply and outputs a phase current to each of the stator windings;
• and
• a control circuitry which controls the power conversion circuit, wherein
• with a phase voltage crest value relative to a voltage of the DC power being defined as a modulation factor, a threshold value is predetermined for the modulation factor, and
• the control circuitry
• decreases a current amplitude and a current advance angle of the phase current to be outputted from the power conversion circuit, if a temperature of the permanent magnet is higher than a predetermined first threshold-value temperature and the modulation factor is larger than the threshold value, and
• increases the current amplitude and the current advance angle of the phase current to be outputted from the power conversion circuit, if the temperature of the permanent magnet is higher than the first threshold-value temperature and the modulation factor is smaller than the threshold value.