Abstract: Induction motors have become the main driving equipment for fans, compressors and pumps in the industrial field because of their high reliability and easy maintenance. With the massive application of inverters and non-linear loads, the power supply contains low harmonics which significantly affects the low-frequency vibration characteristics of the motor. Restricted by equipment installation space and filter cost, it is quite difficult to add filter devices to eliminate low-order harmonics on the power supply side. In order to weaken the above-mentioned adverse effects, the influence of the power supply containing low-order harmonics on the radial electromagnetic force was analyzed from a theoretical point of view. In addition, a 32 kW induction motor was taken as an example, and low-harmonic windings scheme was designed to weaken the low-order harmonics. The radial magnetic density and radial electromagnetic force characteristics of the motor with the ordinary windings and the low harmonic windings scheme were compared and analyzed by using the time-step finite element method. The results show that the low harmonic windings scheme in this paper can effectively reduce the low-order harmonic component of the air-gap magnetic density and the low-order radial electromagnetic force amplitude. It is verified through field experiments that the low-harmonic windings scheme can effectively suppress low-frequency vibration.