Generator eccentricity, vibration, and shaft currents

ECCENTRICITY of the rotor causes pulsating unbalanced magnetic forces; induced currents in rotor winding, wedges, and surface; and circulating currents between stator circuits with consequent increased losses and temperatures. Inequality in the gap also affects the fringing fluxes at the core end region, and may result in high temperatures in clamping plates or retaining rings.