2Q2017

End-Turn and Phase Lead Vibration Generator end baskets on large turbine generators present unique design challenges for generator manufactures and service organizations. End baskets are comprised of individual end turns, which are integral to the end basket support structure through their arch binding with other structural components.  This electrical and structural system made of [...]

Customer Collaboration – In the practice of engineering we are fundamentally problem solvers.  Our education, training and vitally our experience, are all brought to bear when helping a customer to resolve or understand an issue.  When presented with an issue we quickly move into “Given, Find, Assumptions, Solutions” mode; transitioning as quickly as possible to [...]

Many large hydro-generators have baffle plates on the rotor spider.  The baffle plates induce and control airflow in the unit to cool the rotor rim, pole windings and primarily the stator.  EME recently investigated a unit with a rotor of approximately 300 inches in diameter, which had 8 spider arms, and a span between [...]

People Matter - William V. Loffredo Bill Loffredo (Alfredo Sauce) is a Mechanical Engineer who joined EME in the Spring of 2014.  Originally from New Jersey, he pursued the study of Mechanical Engineering after being exposed to the art of machining in his Uncle’s precision components manufacturing business.  As a student at the Pennsylvania State University, [...]

Recently a generator experienced an overspeed (approximately 4,739 rpm) event. Typically for a 60Hz generator the rotor is designed for stresses at 20% (<4,320) overspeed.  As a result, EME was asked to evaluate portions of the generator rotor (radial studs, retaining rings, forging, & wedges) to determine the stresses that existed at 4,739 rpm and [...]