Dishwasher and control method therefor

A method for controlling a dishwasher comprising a tub, a spraying arm, a supply pump comprising an impeller and a motor and configured to supply wash water to the spraying arm, and a controller configured to control an operation of the supply pump,

• wherein the spraying arm comprises first and second channels configured to independently guide the wash water and a plurality of spraying holes configured to spray the wash water supplied to each of the channels in preset directions,
• wherein a first spraying direction of the spraying holes in fluid communication with the first channel is different from a second spraying direction of the spraying holes in fluid communication with the second channel,
• wherein the spraying arm rotates in a clockwise direction in response to the wash water being supplied to the first channel, and the spraying arm rotates in a counter-clockwise direction in response to the wash water being supplied to the second channel,
• wherein a first total area of the spraying holes in fluid communication with the first channel is different from a second total area of the spraying holes in fluid communication with the second channel, and
• wherein the method comprises:
• performing a channel determining step that determines whether the spraying arm is in a first state in which the wash water is being supplied to the first channel or a second state in which the wash water is being supplied to the second channel;
• and
• performing a washing step that sprays wash water toward dishwashing objects held in the tub based on the channel determining step, the washing step comprising:
• controlling the rotation direction of the spraying arm by controlling, based on a current flowing to the motor, the operation of the supply pump to selectively supply the wash water to the first channel or the second channel.