THE INDUCTION MOTOR. 



gap, and of the pole-pitch upon the leakage factor, can all be answered 

 by consulting the short-circuit characteristic. I shall proceed to dis- 

 cuss, point for point, the influence of these factors on the leakage co- 

 efficient. 



THE SLOTS. 



30. The curves A and B, in Fig. 10, represent the short-circuit char- 

 acteristics for a closed slot of the shape marked A, and of the open 

 slots of the shape marked B. The slots of the armature were closed 



B 



120 



100 200 300 400 500 600 700 800 900 



FIG. IO. 



in each case. Curve C shows the ideal short-circuit curve obtain- 

 able only if the leakage paths contain no iron at all. Curve D is the 

 magnetizing current reduced from the measured value of 42.2 am- 



20 



