SYNCHRONOUS MOTORS 



synchronous motors for ordinary frequencies (40 to 60 cycles) 

 presents no special difficulties, if the speeds corresponding to these 

 frequencies are not objectionable, because these speeds are perfectly 

 allowable so far as centrifugal force is concerned. 



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On the other hand, in the construction of small synchronous motors 

 to run at low angular velocities, it is extremely difficult to find space for 

 the numerous conductors and for the exciting or field coils, which 



