Strictly speaking, harmonics refer to the electricity contained in the current whose frequency is an integer multiple of the fundamental wave. Generally, it refers to the Fourier series decomposition of periodic non-sinusoidal electricity. , the amount of electricity generated by the remaining currents greater than the fundamental frequency. Harmonics reduce the efficiency of the production, transmission and utilization of electrical energy, cause electrical equipment to overheat, produce vibration and noise, cause insulation to age, shorten service life, and even malfunction or burn out. The output waveform of Guangneng Yineng Nuclear Energy's superconducting energy-saving motor is close to the sine wave plus its output reactance, so there is no harmonic loss.