Electromagnetic field models and their influences onthe temperature field of large hydrogenerator
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Abstract:
To accurately analyze the loss and heat of large hydrogenerator,the finite element models of 2D steadystate electromagnetic field,moving electromagnetic field and fieldcircuit coupling are established respectively.As an example,the losses of the rotor iron and damper winding of a 36 MW tubular hydrogenerator are calculated.Furthermore,the influences of 3 different electromagnetic field models on the thermal sources and temperatures are analyzed by 3D finite element calculation of the temperature field.The results are compared with the test data and indicate that the precision of the fieldcircuit coupling model is better.The losses of each damp bar are different and the heat of the damp bar at the lee side is larger than that at the windward with the full load.The maximal temperature of the rotor is located at the damper winding,instead of the field winding.The research is valuable for improving the calculation precision of the rotor losses and temperature field and enhancing the reliability of the hydrogenerator design and operation.
