Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . the three coils in one slot are treated as if they occupied sep-arate slots in the diagram. In Fig. 37 the path of the winding can befollowed thus: A coil is in the top of slot 1 andin the bottom of slot 4; another in the top of 2and bottom of 5, etc. One terminal of the firstcoil goes to
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . the three coils in one slot are treated as if they occupied sep-arate slots in the diagram. In Fig. 37 the path of the winding can befollowed thus: A coil is in the top of slot 1 andin the bottom of slot 4; another in the top of 2and bottom of 5, etc. One terminal of the firstcoil goes to commutator bar 10, the other to 4;the terminals of the second coil to 11 and 5; andthus around the core until the connections arecomplete. This is a wave-w4nding and, when connected in this way andwith the brushes placed as shown, there are two parallel pathsthrough the winding from brush to brush. Each path is throughthe field under all four poles so that any possible inequality of thefields does not affect the counter-electromotive force and hence thedistribution of the current in the armature. Fig. 38. Commu-tator. Fig. 39. Armature Complete Commutator. The commutator is shown in Fig. 38. It doesnot differ essentially from the usual form and consists of 123 harddrawn copper bars, separated by soft mica and assembled in cy-lindrical form. These bars are held together in the manner usuallyfollowed with this kind of construction. A cast-iron shell has 139 34 ELECTRIC RAILWAYS a V-shaped flange at one end. The ends of the bars are formedto fit under this flange. The other ends fit under a steel taper ringwhich is pressed against the bars by a clamping nut. The barsare insulated from the bushing and ring by moulded mica. Oneend of each bar is slotted for the accommodation of the leads fromthe armature winding. The complete armature, with windings and commutator in place,is shown in Fig. 39. Brushes and Brush-Holders. The brushes for railway motorsare carbon blocks, 2 inches, mor
Size: 2043px × 1224px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
