CHAPTER VIII 

 ARMATURE WINDINGS 



The three usual methods of depicting an armature winding are 

 by the winding table, the development and the radial or end-view 

 diagram. Give all of these for each of the following cases, as 

 assigned. Also show the location of the poles and brushes in each 

 case. Coordinate paper is convenient for making the develop- 

 ments. 



Note. Armature windings may be studied advantageously 

 with the aid of small wooden models, say about three inches in 

 diameter by one inch long. Upon the cylindrical surface of these 

 saw cuts are made to represent the slots. On the front end of this 

 model may be a boss one inch in diameter and about J inch long, 

 to represent the commutator, with small brads driven in opposite 

 alternate slots to mark the segments and serve for the attachment 

 of a winding of thread. It is also well to have a small boss on the 

 back side to represent the shaft. The following problems are 

 based upon such model armatures, having 26 and 36 slots respec- 

 tively: 



10. Put the winding of problem 1 on the proper model using 

 thread. Take this off and wind on the corresponding left-hand 



winding. (8 min.) 



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