. 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. FIELDMAGNETS PlG. 1,3S9.—Revolving armature alternator. Revolving armatures are suitable for machinesgenerating current at comparatively low pressure, as no difficulty is experienced in col-lecting such current. Revolving armature alternators are also suitable for small powerplants, isolated lighting plants, where medium or small size machines are required.
. 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. FIELDMAGNETS PlG. 1,3S9.—Revolving armature alternator. Revolving armatures are suitable for machinesgenerating current at comparatively low pressure, as no difficulty is experienced in col-lecting such current. Revolving armature alternators are also suitable for small powerplants, isolated lighting plants, where medium or small size machines are required. revolve while the field magnets are attached to a circular frameand arranged radially around the armature, as shown in It may be single or polyphase, belt driven, or directconnected. 1,144 HAWKIXS ELECTRICITY Ques. When is the revolving type of armature usedand why? It is used on machines of small size because the pressuregenerated is comparatively low and the current transmitteds small, no difficulty being experienced in collectingsuch a Pic. —Ring wound dynamo arranged as alternator by replacing commutator withcollector rings connected to the winding at points 180* apart. Ques. Could a dynamo be converted into an alternator? Ques. How can this be done? By placing two collector rings on one end of the arma-ture and connecting these two rings to points in the armaturewinding 1S0° apart, as shown in fig. 1,390. ALTERNATORS 1,145 Ques. Would such arrangement as shown in fig. 1,390make a desirable alternator? Ans. No. Alternating current windings are usually different from those used fordirect currents. One distinction is the fact that a simple open coilwinding may be, and often is, employed, but the chief difference is theintermittent action of the inductors. In a direct current Gramme ring winding a certain number of coils are always active, while those in the spacebetween the pole pieces are not gen-erating. In this way a practicallysteady press
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