Özet:

Electromagnetic (EM) analysis of hydropower generators is common practice but there is little emphasis on studying the effect of rotor whirling in the analysis. This paper explores the effect on electromagnetic analysis as the rotor is allowed to whirl both in forward and in backward directions under no-load conditions. As a hydropower generator rotor shaft can experience whirling when under eccentric operation, the objective is to examine how whirling can affect the unbalanced magnetic pull (UMP), flux densities, damper currents, and ohmic losses in a synchronous hydropower generator. These results are obtained in a commercial FEM-based EM field modelling software package that allows various degrees of freedom in motion types and multiple motion components to be set. It is seen that backward whirling tends to induce higher eddy currents than forward whirling does.

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