Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 183
circuit when the two-part commutator isused is shown in Fig. 131. An e.m.f. such as that representedin Fig. 131 is called a pulsating e.m.f., because it pulsates orchanges from zero to a maximum and back to zero at regularintervals. 179. Multiple-Coil Armatures.—If the armature of a direct-current… … Fig. 132 shown in Fig. 131. The operation of such a machine wouldbe very unsatisfactory in a great many cases. Fortunately thee.m.f. between the brushes of the machine can be made morenearly constant in value in the following way: Suppose two closed coilsA o (A) and (B) be placed on the armature at…
Electrical engineering
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