Unbalance of generator rotors is a major contributor to generator downtime, costing power producers hundreds of thousands of dollars in lost revenue each year. Proper attention to design detail, manufacturing tolerances and procedures, during initial manufacture or subsequent rewinds, can minimize the possibility of vibration related incidents. Rotor unbalance has many causes. This paper will focus on causes that can be corrected with rotor balancing. beginning with a brief review of current balance standards, for both rigid and flexible rotors, and ending with specific case histories and actual solutions, this paper should be useful to plant engineers tasked with diagnosing generator rotor unbalance problems. It will also be useful to those decision makers in the industry faced with making recommendations for improving generator rotor unbalance problems.
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