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DC Generators DC EQUIPMENT CONSTRUCTION DC EQUIPMENT CONSTRUCTION Direct current machines are energy transfer devices.  These machines can function as either a motor or a generator.  DC motors and generators have the same basic construction, differing primarily in the energy conversion.   To better understand the  operation  and  construction  of  DC  machines,  a  few  basic  terms  must  be understood. EO 1.4 STATE  the  purpose  of  each  of  the  following components of a DC machine: a. Armature b. Rotor c. Stator d. Field Armature Figure 2   Basic DC Machine The purpose of the armature is to provide the energy conversion in a DC machine (refer to Figure 2). In a DC generator, the armature is rotated  by  an  external  mechanical force,   such   as   a   steam   turbine. This rotation induces a voltage and current    flow    in    the    armature. Thus, the armature converts mechanical   energy   to   electrical energy. In   a   DC   motor,   the   armature receives  voltage  from  an  outside electrical    source    and    converts electrical  energy  into  mechanical energy in the form of torque. Rotor The 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  DC motor,  the  rotor  is  the  component  that  turns  a  piece  of  equipment.    In  both  types  of  DC machines, the rotor is the armature. Rev. 0 Page 3 ES-05


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