MOTOR DRIVING APPARATUS, VEHICLE PROVIDED WITH SAME, AND METHOD OF CONTROLLING MOTOR DRIVING APPARATUS

An ECU (40) sets target value of a system voltage based on an electric power loss of a motor generator (MG1, MG2) and an inverter (20, 30) and controls a voltage boost converter (10). The ECU (40) calculates the target value of the system voltage using a function expression generated, for each operating point of the motor generator (MG1, MG2), by approximating a loss characteristic which represents change of the electric power loss with respect to change of the system voltage, by a quadratic expression or a linear expression of the system voltage.