222 



HANDBOOK OF MECHANICAL DESIGN 

 MULTISPEED MOTORS, CONSTANT TORQUE, KEY DIAGRAMS 



Single winding, two speed 

 N.E.M.A. MG 6-41, Fig. 7, 1930 



Single winding, two speed 

 A.S.A. C-6 3.720, 1938 



Two winding, three speed 

 N.E.M.A. MG 6-41, Fig. 7, 1930 



Speed 



Lqw*. . . 

 Second f. 

 High*... 



Li 



Tn 

 T, 



Tn 



Tu 

 T, 



Lz 



7'3, Tt 

 Tu 



Tr, 



r,, 7'=, Tz, r, together 



Terminals not listed must be left open. 



* Low speed half of high speed. 



t Second speed between low and high. 



Speed 



Low*. . . 

 Second f . 

 High*... 



Two winding, three speed 

 A.S.A. C-6 3.720, 1938 



T„ T2, T,, r, together 



Terminals not listed must be left open. 



* Low speed half of high speed. 



t Second speed between low and high. 



T,T, 



Two winding, four speed 

 N.E.M.A. MG 6-41, Fig. 7, 1930 



Two winding, four speed 

 A.S.A. C-6 3.720, 1938 



Terminals not listed must be left open. 



Terminals not listed must be left open. 



