電動機固定子の制振手法

抄録

This paper deals with the quenching problem of electromagnetic vibration of the motor stator in the wide frequency region around the natural frequency. Two vibration quenching methods were considered, namely, the method using two dynamic absorbers, and that using together three elements of imperfect mass, spring supports and Houde dampers. The iron stator of motor is modeled by circular ring, and vibration quenching devices are installed on the outside of iron stator to quench the forced vibration caused by the rotating distributed electromagnetic force. The solutions of forced vibration are obtained by the theoretical analysis, and those are compared with the solutions obtained by the finite element method and numerical integration. Following was made clear: (1) The vibration quenching effect is high when pair of dynamic absorbers is set to the places close to the distance between the loop and node of the quenching target mode. (2) When three elements of imperfect mass, spring supports and Houde damper are used, the vibration quenching effect is high, and in particular, its effect becomes higher when the distance between the two Houde dampers is close to that between the loop and node of the quenching target mode like the method using the pair of dynamic absorbers. (3) When quenching vibration using three elements, to obtain almost the same quenching effect as the pair of dynamic absorbers, the mass of the Houde dampers are needed about 10 times the mass of the dynamic absorbers. (4) The results obtained by the theoretical analysis using ring theory and those obtained by the finite element method and numerical integration agreed well each other in each vibration quenching method.