. 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. y. Again if the earth berega-ded as being stationary, the two boats are at rest and the water is moving relativeto the earth. of a generator move with respect to the field magnets, or thefield magnets move with respect to the armature, so far as inducingan electric current is concerned. For alternators of medium and large size there are severalreasons why t
. 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. y. Again if the earth berega-ded as being stationary, the two boats are at rest and the water is moving relativeto the earth. of a generator move with respect to the field magnets, or thefield magnets move with respect to the armature, so far as inducingan electric current is concerned. For alternators of medium and large size there are severalreasons why the armature should be stationary and the fieldmagnets revolve, as follows: 1,148 HA WKINS ELECTRICITY 1. By making the armature stationary, superior insulationmethods may be employed, enabling the generation of currentat very much higher voltage than in the revolving armature type. 2. Because the difficulty of taking current at very high pres-sures from collector rings is avoided. The field current only passes through the collector rings. Since thefield current is of low voltage and small in c tmparis <n with the maincurrent, small brushes arc sufficient and sparking troubles are avoided. POLE PIECECOREARMATURE COILS MAIN CURRENT. DOVE TAIL JOINTFIELD COILS ARMATURE FRAMETO SOURCE OF FIELD CURRENT-FIELD MAGNETS ROTOR STATOR Fig. 1,394.—Diagram showing essentia! parts of a revolving field alternator and method ofjoining the parts in assembling. 3. Only two collector rings are required. 4. The armature terminals being stationary, may be enclosedpermanently so that no one can come in contact with them. Ques. What names are usually applied to the arma-ture and field magnets with respect to which moves? Ans. The stator and the rotor. ALTERNATORS 1,149 The terms armature and field magnets are to be preferred to suchexpressions. An armature is an armature, no matter whether it moveor be fixed, and the same applies to the field magnets. There is nogood reason to apply other terms
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