The present invention provides a high-speed motor for supplying high-output power by preparing a power transmission device, which increases rotational power at the front of a motor converting electrical energy into mechanical energy, so as to cause a rotary motion, obtain power, and supply the power, such that the power transmission device generates torque through an interaction of attraction and repulsion between a rotating magnetic field and a magnetic field generated by receiving the rotational power of the electric motor of receiving the rotational power of the electric motor and external electric power, thereby implementing a motor for transferring power with an increased number of revolutions and torque.