Vibration Control of Motor Stator Using Dynamic Absorbers, Imperfect Mass and Elastic Supports

Abstract

　This paper deals with the quenching problem of electromagnetic vibration of the motor stator in the wide frequency region around the natural frequency. The iron stator is modeled by a perfect circular ring. To quench its vibration, single mass is set on the stator, it is supported by the two springs, and a pair of dynamic absorbers is installed on the outside of it. The solutions of forced vibration are obtained by the theoretical analysis and the finite element method. Following was made clear: (1) The vibration quenching effect is improved by using an imperfect mass and spring supports in addition to the dynamic absorbers. (2) If an imperfect mass is set to be effective for cos mode and spring supports are set to be effective for sin mode, and a pair of dynamic absorbers is installed about the angle between the loop and the node of the quenching target mode, higher quenching effect is obtained. (3) The results obtained by the theoretical analysis and the finite element method coincide qualitatively with each other.