a first inverter including a plurality of switching devices and connected to first ends of windings of a motor;

a second inverter including a plurality of switching devices and connected to second ends of the windings of the motor;

a transfer switching unit including a plurality of switching devices of which first ends are connected to the windings of the motor, respectively, and of which second ends are connected to each other between the first inverter and the second inverter; and

a controller configured to control the transfer switching unit to drive the motor in accordance with a single inverter driving mode that utilizes the first inverter and a dual inverter driving mode that utilizes the first inverter and the second inverter, and configured to turn off the transfer switching unit and drive the second inverter to convert a driving mode of the motor into the dual inverter driving mode when the transfer switching unit breaks down in the single inverter driving mode;

wherein the controller is configured to operate the motor in a Y-connection by turning on the transfer switching unit in the single inverter driving mode, and to operate the motor in open-end winding by turning off the transfer switching unit in the dual inverter driving mode.