332 ELECTRICAL MACHINERY 



winding of a generator and, although its function is primarily 

 to produce a magnetic field, it does not resemble at all the 

 field winding of an alternator or c-c. generator. 



Elementary Representation of a Stator Winding. It is 

 seen that the stator core has no projecting pole pieces as 

 has the field structure of an alternator, but to make the 

 explanation of the rotating magnetic field easier we shall 

 suppose that there are isolated pole pieces, each wound with 

 an ordinary field coil. 



FIG. 215. Stator of an Induction Motor, Showing Windings. General 

 Electric Co. 



The diagram of such a stator, for a two-phase, two 

 poles per phase, motor is shown in Fig. 216. Poles 1 and 

 3 are wound in series and connected to the terminals marked 

 phase 1; poles 2 and 4 are similarly wound and connected 

 to the terminals marked phase 2. Moreover, these poles 

 are so wound that a current through coils 1 and 3 produces 

 a S pole at 1 and a N pole at 3; coils 2 and 4 are similarly 

 wound in such a way that when a N pole is produced at 2, 

 a S pole is produced at 4, etc. 



Each Phase Takes Same Current. t Suppose that the 

 terminals of the motor are connected to a two-phase power 



