148 



TKEATISE ON ALTERNATING CURRENTS. 



currents, is called a StatOP ; the rotating part in which currents 

 are induced is called a RotOP. 



Both Stator and Kotor are built up of laminated iron, and the 

 copper conductors are imbedded in the iron itself so that the air- 

 space between the stationary and moving parts may be made as 

 small as possible. 



STATOK WINDING. 



99. There are two general methods of winding the Stator 

 coils ; one the star-winding? is depicted in Fig. 54, in the 



FIG. 54. 



FIG. 55. 



case of a tri-phase motor, and in Fig. 55, in the case of a di-phase 

 motor. In this method of winding, all the coils have one end in 

 common, the other end of each going to the respective line wire. 



The other way of winding the Stator is to wind the coils 

 like a Gramme ring in one closed coil, tapped at three or four 

 equidistant points, according as it is intended for tri-phase or 

 di-phase currents. This is shown in Figs. 56 and 57, and is 

 termed Mesh-winding". 



FIG. 5G. 



FIG. 57. 



