Motor driving apparatus and method thereof

A motor driving apparatus, comprising:

• a dc-link capacitor configured to store direct current (DC) power;
• an inverter that includes a plurality of switching elements, and that is configured to convert the DC power stored in the dc-link capacitor into alternating current (AC) power and output the AC power to a motor;
• a dc-link resistor element located between the dc-link capacitor and the inverter;
• and
• a controller configured to, based on a space vector pulse width variable control, output at least one signal to control operations of the inverter,
• wherein the controller is further configured to:
• calculate a phase difference between a first sampling point among a plurality of sampling points that are preset for the space vector and a voltage command vector,
• generate, based on the calculated phase difference, a switching frequency,
• determine, based on a level of the voltage command vector and the calculated phase difference, a first operating point located in a dead band in which a current flowing through the dc-link resistor is undetectable, and a second operating point located at a boundary or outside of the dead band, and
• sequentially output a signal corresponding to the first operating point and a signal corresponding to the second operating point in a switching cycle corresponding to the switching frequency,
• wherein the plurality of sampling points are preset based on the boundary of the dead band and a plurality of effective voltage vectors, and
• wherein a phase of an average of a voltage vector corresponding to the first operating point and a voltage vector corresponding to the second operating point corresponds to a phase of the first sampling point.