250 



ARMATURE CONSTRUCTION 



The coil must next be dried in a vacuum oven and dipped twice 

 in a plastic varnish, and subsequent to each dipping it should be 

 dried for three hours in a vacuum oven at 90 C. 



After dipping the slot portion in hot paraffin wax, to protect it 

 against possible abrasion during assembling, the coil is ready to 

 be assembled on the armature. The section through this coil 

 assembled in the slot is shown in Fig. 285. 



When completely assembled on the armature core and bound, 



n^ic Wood 



OCC 



~~ '24 



/shecl MATH//* "06 

 Tot,*/ U /ckncs* 9 S. 



FIG. 287. Section through wide open Slot of Stationary Armature. 



such a winding should stand for one minute at 20 C. the 

 application of at least 3500 R.M.S. volts from copper to core. 



In Fig. 286 is shown the slot arrangement for a strip winding 

 with 8 conductors per slot, placed 4 wide and 2 deep. Such a 

 500-volt strip winding should be tested with at least 3500 volts 

 when connected and completed. 



The strips, after being served with "jaconet" tape and thoroughly 

 dried, must be made waterproof by impregnating the tape with 

 some good and preferably plastic varnish. After the application 

 of each coat of varnish, the strips must be baked for three hours in 

 a vacuum oven at 90 C. 



