368 ELECTRICAL MACHINERY 



tically identical with a c-c. generator with this addition; 

 on that end of the armature opposite to the commutator 

 is mounted a set of slip rings (the number of rings depending 

 upon the number of phases desired) which are connected 

 by taps to the armature winding just as though this winding 

 had been intended for use as a synchronous motor. 



In Fig. 240 is shown a small, three-phase synchronous 



FIG 240. General View of a Small Three-phase Synchronous Con- 

 verter, Showing Commutator on One End of the Armature and 

 Slip Rings on the Other. Fort Wayne Electric Works. 



converter; it is seen to be identical in appearance with a 

 c-c. generator, with, however, the slip rings added on one 

 end of the armature. 



Suppose that such a machine is running, as a synchro- 

 nous motor; the action of the commutator and revolving 

 armature winding will be just the same as though the 

 armature was being driven by a belt and pulley instead 

 of by the synchronous motor action and hence there will 



