| Summary: | This paper deals with the quenching problem of electromagnetic vibration of the motor stator in the wide frequency region around the natural frequency using multiple dynamic absorbers. The iron stator of motor is modeled by circular ring, and a pair of dynamic absorbers or two pair of them are installed on the outside of the circular ring to quench the forced vibration caused by the rotating distributed electromagnetic force. The solutions of forced vibration are obtained by the theoretical analysis. Following was made clear: (1) By installing two dynamic absorbers those have the same appropriate natural frequency ratios and damping ratio, the iron stator is quenched well. (2) By installing the same two dynamic absorbers leaving an angle that is equals to the one between loop and node of the mode to be quenched, the iron stator is quenched best. (3) By installing the two dynamic absorbers those have different natural frequency ratios and damping ratios each other, the quenching effect become a little better than the case mentioned above. (4) By installing the multiple pair of dynamic absorbers, the quenching effect become much more better than the cases using a pair of dynamic absorbers.
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