In order to study the influence of gap flux density harmonic wave from sine winding,a single phase induction motor was taken as an example,the motor-filed in the form of the sinusoidal winding and the ordinary concentric winding were calculated by two-dimensional finite element method,then each harmonic amplitudes and the proportions of each harmonic were obtained due to the Fourier decomposition of gap flux density obtained. Through comparison and calculation,the result indicate that: compared to ordinary ...