The motor is a device that converts electrical energy into mechanical energy. The energy consumption of the motor is mainly the electrical energy lost and wasted in the process of converting electrical energy into mechanical energy to do work. It belongs to the energy conversion efficiency of motor equipment itself in non-standard environment. When the motor is empty, the motor does not produce any beneficial contribution to the conversion of mechanical energy, both the motor has no efficiency, but the motor is still in power consumption! In the actual production process, the efficiency of the motor is constantly changing from 0% to 100% of the rated power. It is necessary to rely on technical means to improve the actual efficiency of energy use, through technical means to save energy, according to different working conditions to achieve economic operation of the motor.