CHAPTER IX 

 CONVERTERS 



233. Rotary Converter. The rotary converter or synchro- 

 nous converter is a combination of a synchronous motor and a 

 direct-current generator. It receives alternating current and con- 

 verts it into direct current. 



The armature winding is an ordinary direct-current winding 

 and may be either series or multiple. It is connected to a com- 

 mutator and taps are taken out from it at equidistant points and 

 connected to slip rings. The alternating current is delivered to 

 the slip rings either single-phase, two-phase, three-phase or six- 

 phase and drives the armature as a synchronous motor. The 

 same armature conductors generate and carry the direct current. 



FIG. 349. Ring-wound rotary converter. 



Fig. 349 shows a ring-wound bipolar armature tapped for single-, 

 two-, or three-phase currents; single-phase 1 to 2 or 3 to 4; 

 two-phase 1 to 2 and 3 to 4; three-phase 1 to 5, 5 to 6 and 

 6tol. 



Fig. 350 shows a six-circuit multiple winding for a six-pole, 

 three-phase rotary converter and Fig. 351 shows a two-circuit or 

 series winding for an eight-pole, three-phase converter. 



369 



