Abstract: Stator and rotor vibration characteristics of nonsalient synchronous generator for different operating conditions are analyzed. Firstly, the electromagnetism characteristics and armature reaction characteristics are calculated for different operating conditions, the frequency characteristics of pulsating electric magnetic force acting on the stator and imbalance electric magnetic force acting on the rotor are analyzed when the generator works normally. Then the changing characteristics, stator radial second frequency vibration and rotor radial fundamental frequency vibration due to the generator active power when the excitation current is constant, can be gotten. And the changing characteristics, due to the excitation current when the generator active power is constant, can also be gotten. Finally, the stator and rotor vibration of a type SDF-9 generator is measured in the laboratory to verify the theoretical analysis presented above. On the other hand, the conclusion can be drawn, which is the generator operation condition must be considered when generator fault is analyzed and diagnosed based on vibration characteristics, otherwise the diagnosis result will be incredulous.

Key words: Generator, Operation condition, Radial vibration, Rotor, Stator