Losses Caused by End-region Field in Synchronous Generators at Different Operating Conditions

It is challenging to measure losses caused by end-region field in real synchronous generators, because of accessibility and cost. This paper presents a dedicated test setup to emulate the field experienced by clamping structures and stator end core, and validate loss models. Measurements show that the loss model employed has an averaged error of 3.6%. Investigation of a 100 kVA synchronous generator shows that these losses are heavily dependent on operating conditions. The case with Leading PF has the highest loss, and the dominant loss component for all the cases is eddy current loss in clamping structures.