354 



ELECTRICAL EQUIPMENT 



Vertical direct-driven exciters, Fig. 210, are ordinarily pro- 

 vided with one or two guide bearings and a short shaft with 



FIG. 203. InductiDn Motor-drivsn Exciters. 



FIG. 209. 3000-K.W. Frequency Changer Set, Showing -Mounting of Direct- 

 connected Exciter. 



coupling. The rotating element is supported by means of a 

 thrust bearing located on the upper bearing bracket. It should 



