Abstract
In this study we investigate cylindrical dynamic damper to reduce electro-magnetic vibration of electric rotating machinery as turbine generator. In a turbine generator, the rotating electro-magnetic pull force of the rotor causes the stator core vibration of the oval deformation rotating synchronously with the rotation speed of the rotor. Connecting a cylindrical dynamic damper to the stator core by 8 radial springs and optimizing the stiffness of the connection springs, the responses of the oval natural modes excited by the electro-magnet pull force of the generator rotor can be reduced. We calculate the dynamic response of the core in a case of applying a cylindrical damper to a 300MW class turbine generator numerically. According to the analysis results the transmission of the electro-magnetic vibration to the base of the generator from the stator core can be efficiently reduced by the cylindrical damper. The cylindrical dynamic damper is very suitable to install in the turbine generator.
