Characterization of Radial Electromagnetic Force and Vibration Response in Squirrel-cage Induction Motor under PWM Supply

A squirrel-cage induction motor is used in this paper for studying time harmonic current produced by frequency converter on account of the electromagnetic vibration. The order and amplitude of the radial electromagnetic force are obtained by the analytical calculation method and time-step finite element method. Combining 2D-fourier analysis, the frequency and amplitude of the force waves of the vibration response of induction motor are obtained, and the electromagnetic vibration response of the motor is calculated. Finally, the vibration response test was carried out on a prototype, electromagnetic vibration and the finite element simulation calculation results are in good agreement with the experimental results. The accuracy of the calculation result is verified in this paper.