Electric motor driving apparatus

An electric motor driving apparatus for controlling driving of an electric motor having windings of two or more phases, each of which is open at both ends, by using two inverters, the electric motor driving apparatus comprising:

• a first inverter having plural first switching elements provided in correspondence to respective phases of the windings and connected to one end of the winding;
• a second inverter having plural second switching elements provided in correspondence to respective phases of the windings and connected to the other end of the winding;
• and
• a control unit including a first inverter control circuit and a second inverter control circuit, the first inverter control circuit and the second inverter control circuit are for generating a first voltage command and a second voltage command as output voltage commands to the first inverter and the second inverter, respectively, based on a torque command;
• wherein the control unit is configured to determine a composite voltage command indicating outputs of the first inverter and the second inverter based on a first voltage vector and a second voltage vector, including a case in which a pure phase difference between the first voltage vector on a dq coordinate corresponding to the first voltage command and the second voltage vector on the dq coordinate corresponding to the second voltage command is other than 180°.