Turbgenerator Rotors: Case Studies

Some of our most challenging projects have lead to some of our best innovations in design and manufacturing.

Rewind RotorMany rotor rewind projects follow a very usual and predictable scope of work from the time the rotors arrive at our Rotating Equipment Service Center (RESC) — in inspection and disassembly to rewind and balancing, nothing outside the range of ordinary occurs. But when a unit experiences a failure or testing shows changes in the way it is operating, many companies can offer owners little more than a speculation as to the source of the problem or the way to fix it. NEC is a different sort of company in its years of on-the-job experience, technical engineering know-how and the flexible manufacturing resources. NEC's ability to revese engineer almost any machine design is well-known in the industry. Coupled with a drive to "get it right," NEC is always ready to consider new life for old machine over a presumption that scrap metal is only reasonable and economic option. NEC engineers approach problems of this sort whollistically, seeking options that best meet the owner's priorities for schedule and budget. Some of NEC's most challenging projects have lead to some of its best innovations in design and manufacturing. When one utlity customer needed a more economical way to retrofit a fleet of generators that were statisically likely to face rotor pole-to-pole crossover failures in next five years, NEC developed a repair design and installation procedure that would allow the retrofits to be made at the owner's sites with the rotors still in place. When end turn blocking failures affected multiple machines of the same design, NEC re-engineered the end turn blocking design improving the original design and materials, eliminating the sources of the problem deterioration mechanisms.

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