DC GeneratorsDC EQUIPMENT CONSTRUCTIONDC EQUIPMENT CONSTRUCTIONDirect current machines are energy transfer devices. These machines can functionas either a motor or a generator. DC motors and generators have the same basicconstruction, differing primarily in the energy conversion. To better understandthe operation and construction of DC machines, a few basic terms must beunderstood.EO 1.4 STATE the purpose of each of the followingcomponents of a DC machine:a. Armatureb. Rotorc. Statord. FieldArmatureFigure 2 Basic DC MachineThe purpose of the armature is toprovide the energy conversion in aDC machine (refer to Figure 2).In a DC generator, the armature isrotated by an external mechanicalforce, such as a steam turbine.This rotation induces a voltage andcurrent flow in the armature.Thus, the armature convertsmechanical energy to electricalenergy.In a DC motor, the armaturereceives voltage from an outsideelectrical source and convertselectrical energy into mechanicalenergy in the form of torque.RotorThe purpose of the rotor is to provide the rotating element in a DC machine (refer to Figure 2).In a DC generator, the rotor is the component that is rotated by an external force. In a DCmotor, the rotor is the component that turns a piece of equipment. In both types of DCmachines, the rotor is the armature.Rev. 0 Page 3 ES-05
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