STATOR END REGION HEATING LIMITWhen the synchronous machine is underexcited the armature end leakageflux is increased. This flux enters and leaves in a direction perpendicular to the stator laminations causing eddy currents in the laminations, and hence heating. This can limit the capability, particularly for round rotor machines. A typical example of such a limitation is shown in Figure 2.13. The limits on reactive power generation and absorption given in this subsection and the two previous ones are imposed by internal synchronous machine design. As seen they are dependent on the terminal voltage of the generator. There are also other considerations that can further limit the reactive capability of the synchronous machine. These are stability limits that could further limit the operation of the machine in underexcited operation.
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