Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 153
d. Since with positive lead the armature polarity strengthens that ofthe field magnet, it is possible, disregarding sparking, to operate a motorwithout any other means being taken to magnetize the field magnets,because the armature will induce a pole in the field magnet and thenattract itself… … ANGLE OF NEGATIVE LEAD NORMAL NEUTRAL PLANE T Fig. 413.—Current commutation in a motor. Considering the coil W which is ascending,current is flowing through it from the top brush, while it is itself the seat of an electro-motive force that tends to stop or reverse its current. The condition for…
Electrical engineering
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