310 



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in Fig. 373, coils d, a, are wound first, and then all the back range 

 coils ; next the bent coil c ; and lastly c, b, and the rest of the front 

 range. 



When the method of hand wire-winding is applied to rotating 

 armatures or wound rotors for induction motors, the coils cannot 



FIG. 373. Block for shaping Bent Coil. 



be shaped over a block, and the shaping has to be done by hand. 

 The ranges are laid out in the same way as above. A finished 

 rotor of this type is shown in Fig. 374, which is 4-pole, 3-phase, 

 half-coiled, triple-coil, 3-slot, spiral winding in two ranges. 



Figs. 375 and 376 illustrate a similar rotor at two stages 

 during the winding. The coils in these cases need to be secured 



