Washing machine and control method thereof

A washing machine comprising:

• a cabinet having an inlet disposed on an upper part thereof;
• a tub disposed inside the cabinet and configured to accommodate washing water;
• a rotating drum rotatably disposed inside the tub;
• a pulsator rotatably disposed at an inner bottom of the rotating drum;
• a driving device comprising a motor configured to drive the rotating drum and the pulsator;
• and
• at least one processor, comprising processing circuitry, individually and/or collectively, configured to cause the washing machine to perform washing and dehydration processes,
• wherein the driving device includes:
• a driving motor configured to generate a driving force, and
• a rotating shaft configured to transmit the driving force generated by the driving motor to the rotating drum and the pulsator, respectively, and
• wherein at least one processor, individually and/or collectively, is configured to control the driving device to be operated in a first mode for driving only the pulsator based on the washing process being initiated,
• a rotation speed of the pulsator while the washing water is supplied after the washing process is initiated is lower than a rotation speed of the pulsator while no washing water is supplied during the washing process, and
• at least one processor, individually and/or collectively, is configured to control the driving device to be operated in a second mode for driving both the rotating drum and the pulsator, and open a drain valve to drain the washing water accommodated inside the tub, based on the dehydration process being initiated.