Practical electricity .. with questions and answers (1911)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 163
ss commufcatiKDoi is Ithe self-induction of the coil to be commutated. It is clear that ifcommutation is to take place easily this self-inductionshould be as low as possible. If three-tenths of a volt ap-plied for 1-100 of a second is sufficient to overcome the self-induction of a coil of one turn… … Figure 59 Current from armature 50 amperes. Brush covers all bars a and b. Current into bars a and b, 25 amperes each. Current in coil a=0. Current in coil b=25 amperes. Coil b completely commutated. required with three turns, and so on, for the self-inductionof a coil on any given armattire is…
Electricity
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