International Library of Technology · Scranton, International Textbook Co. · leaf 153
t will be seen that the resultant effect isto weaken the pole corners b, b and strengthen «, a. It isalso evident, from the relation of the field and current inthe armature, that the direction of rotation will be as shownby the arrow, the effect of the cross-magnetization being toshift the field… … Fig. 1413. 3789. Fig. 1413 shows the same armature with thebrushes shifted back to the non-sparking point. The shift-ing of the brushes brings into play the back ampere-turns MOTOR DESIGN. 3529 which are included between the double angle of lead. Itwill also be seen that these back ampere-turns…
Electrical engineering
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