Motor-driving apparatus

A motor-driving apparatus for driving a motor having a plurality of first windings corresponding to a plurality of phases, respectively, comprising:

• a first inverter including a plurality of first switching devices and connected to first ends of the plurality of first windings;
• a second inverter including a plurality of second switching devices;
• a plurality of third switching devices having first-side ends connected to second ends of the plurality of first windings, respectively, and having second-side ends connected to each other;
• and
• a controller configured to form a Y-connection by turning on the plurality of third switching devices and to drive the motor by performing pulse-width modulation control on the plurality of first switching devices when a required output of the motor is less than a preset reference value, and to turn off the third switching device and to drive the motor as an open-end winding motor by performing pulse-width modulation control on the first and second switching devices when the required output of the motor is equal to or greater than the reference value;
• wherein each of the plurality of switching devices of the third switching device corresponds to different one of the plurality of phases, and
• wherein each of the plurality of switching devices of the third switching device comprises a power semiconductor.