100 



ARMATURE CONSTRUCTION 



The bars have a slot milled or punched out on their ends, into 



which is pressed a ring or a 

 circular strip of metal con- 

 stituting the end ring, the 

 joints being sweated up. 



A type of construction 

 differing from both of the 

 above chiefly in the absence 

 of any machining, either to 

 the bars or end rings, is 

 shown in Figs. 108, 109, and 

 110. This method is used 

 by the Allmarma Svenska 

 Elektriska Aktiebolaget, of 



FIG. 108. Winding Squirrel Cage Rotor. 

 Allmanna Svenska Elektriska Aktiebolaget. 



Sweden, and is the invention 

 of Ernst Danielson. 



This construction affords 



good facilities for cooling. The end windings, and the individual 

 wires constituting the end connections, are sometimes proportioned 



FIG. 109. Finished Squirrel Cage Rotor by Allmanna Svciiska 

 Elektriska Aktiebolaget. 



for current densities as high as from 2500 amperes to 3500 per sq. 

 cm. A finished winding of this type is shown in FI'L; 10!), ;nnl the 



MORATORY, I 



FACULTY OF APPLIED scitwct 



