Washing machine and control method of the same

A washing machine comprising:

• a tub configured to accommodate washing water;
• a transmission coil that is provided in the tub and that is configured to transmit power wirelessly by generating a wireless power signal;
• an ammeter configured to measure an input current value of the transmission coil;
• a cylindrical drum that is disposed inside the tub to accommodate one or more objects and that is configured to rotate;
• a balancer configured to reduce unbalance generated by a biasing of the one or more objects during rotation of the drum;
• and
• a controller configured to control the ammeter and the balancer,
• wherein the balancer comprises:
• a reception coil that is provided in the drum and that is configured to generate power from a magnetic field formed by the transmission coil,
• at least two drive modules that are driven by the power of the reception coil and that are provided in the drum, and
• at least one balancing weight that is configured to move along a circumference of the drum by a driving force of each drive module and that is configured to change a center of gravity of the drum, and
• wherein the controller is configured to, based on the drum rotating, determine a position of the at least one balancing weight according to the input current value measured by the ammeter.