A separately excited DC motor presents the following plate data. • armature voltage: V • amature current: I = 30 A = 220 V an an • speed: n = 3000 rpm • excitation voltage: V = 80 V excitation current: I = 4 A starting current: I = 180 A Neglecting the no load losses and the saturation of the magnetic circuit, evaluate: 1) the amature resistance Ra %3D 2) the coefficent between e.m.f. and speed [Vrad/s] 3) the rated torque [Nm] 4) the rated efficiency [%] 5) the speed when the motor delivers 1.5 T (constant flux) n = [rpm]

A separately excited DC motor presents the following plate data. • armature voltage: V • amature current: I = 30 A = 220 V an an • speed: n = 3000 rpm • excitation voltage: V = 80 V excitation current: I = 4 A starting current: I = 180 A Neglecting the no load losses and the saturation of the magnetic circuit, evaluate: 1) the amature resistance Ra %3D 2) the coefficent between e.m.f. and speed [Vrad/s] 3) the rated torque [Nm] 4) the rated efficiency [%] 5) the speed when the motor delivers 1.5 T (constant flux) n = [rpm]

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

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