EXAMPLE OF ALTERNATOR DESIGN 



329 



insulation should be about 0.16 in., or % 2 m -> thick (see Art. 80, 

 page 259), and the total slot space for winding and insulation 

 will be 1 in. wide by 2^ in. deep. The thickness of wedge might 



FIG. 135. "Developed" section through stator and rotor teeth of 8000 

 k.v.a. turbo-alternator. 



be % in., and we shall, in this design, allow an extra slot depth 

 of 1^2 in. above the wedge, with a view to increasing the slot 

 inductance, and so limiting the instantaneous rush of current 

 in the event of a short-circuit. This increased armature indue- 



