Apparatus and method for controlling inverter for driving motor

A method for controlling an inverter for a motor driving, the method comprising steps of:

• generating, by a controller, a d/q-axis voltage reference for allowing a d/q-axis current detection value, which is obtained by measuring a current supplied from the inverter to the motor, to converge on the d/q-axis current reference for driving the motor;
• comparing, by the controller, a difference in magnitude between a first phase voltage reference having a largest magnitude among three-phase phase voltage references and a second phase voltage reference having an intermediate magnitude and a difference in magnitude between the second phase voltage reference and a third phase voltage reference having a smallest magnitude;
• when the difference in magnitude between the first phase voltage reference and the second phase voltage reference is equal to or less than a predetermined value or when the difference in magnitude between the second phase voltage reference and the third phase voltage reference is equal to or less than the predetermined value, correcting, by the controller, a value on a diagonal line passing through a center of a hexagon of a space voltage vector diagram;
• and
• controlling, by the controller, switching of the inverter by applying a discontinuous pulse width modulation (DPWM) based on the converted three-phase phase voltage references.