Answered: An electromechanical AC/DC conversion…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

An electromechanical AC/DC conversion system consists of a 460V, 175hp, four-pole, 60Hz,
Y connected induction motor mechanically coupled to a separately excited, 430V, 130kW,
four-pole DC generator. The parameters of the motor and the generator are given below:

Induction Motor: R1=0.058Ω; R2=0.037Ω	DC Generator: Ra=0.15Ω;	Pf,wi=2kW
X1=0.32Ω; Xm=9.24Ω;	X2=0.386Ω Pf,wi=1kW

Test measurements show that the field winding current of the DC generator has to be
adjusted to 20A when the machine operates at full load at 1800rpm and rated voltage.
If the induction machine, supplied from the 460V (line to line) source, operates at 4% slip
while driving the DC generator, calculate:
a) The induction motor stator current, input power, and output torque (mechanical torque
on the motor shaft).
b) The DC generator load current, and the output power delivered to the load, assuming
that the field winding current is 20A. Calculate the efficiency of the whole system

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