Thick wire has high efficiency in the transfer of energy.
When motor uses 0.5 mm wire, trial was not successful
and terminal was burnt, so we tried using thin wire.
Motor sometimes stops and moves. This means there is
no power; so further winding will improve the power.
They used lead to connect two wires, but not successfully.
As a result, the motor did not rotate. Also, they did not
scratch the joined parts of the two wires.