shunt180v, deDuestionmotorconstantdrivesofat.speedtorgueloadarmatureand1600rev/min. Theandllo0 ohmsfieldresistances.2.ohmsareYespectively. Thedraws.linemotorcurrentof8.7 A. Assumethatfield cktbycurrent,resistanceisaddedinthecurrentfield.thetoreducethecalculatearmaturemotorspeedthevaluetheaddedresistance.andtheextralosses.

Voltage V=180V Armature resistance Ra = 2ohm Field resistance 100ohm Speed 1600rpm Motor draw a…

shunt Puestion 180v, dc drives constant motor load. at speed of torgue armature and 1600 rev./min. The and lo0 ohms field resistances. 2ohms are Yespectively. The motor. draws line that 8.7 A. Assume the current of field ckt by current, resistance is added in eurrent field the to reduce the Calculate armature motorspeed the value of _the added resistance,and the extra losses.

shunt Puestion 180v, dc drives constant motor load. at speed of torgue armature and 1600 rev./min. The and lo0 ohms field resistances. 2ohms are Yespectively. The motor. draws line that 8.7 A. Assume the current of field ckt by current, resistance is added in eurrent field the to reduce the Calculate armature motorspeed the value of _the added resistance,and the extra losses.

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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Prob. 12. A D.C. series motor runs at 500 r.p.m. drawing 40 A from 600 supply. Determine the value of the external resistance to be added in series with the armature for the motor to run at 450 r.p.m. The load torque vwries as the square of the speed. Assume linear magnetisation and take armature resistance as 0.3 ohm and series field resistance is 0.2 ohm.
a 220v dc shunt motor takes 5a and 40a at no load and full load respectively it has an armature resistance of 0.2 ohm and field resistance of 110 ohm respectively. iron,friction and windages losses are negligible.then using among parameters find following. the ratio of emf at no load to full load
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A shunt DC motor is operated at no-load at rated voltage 220 V, speed 1700 rpm and armature current 3.5 A. The resistance of the armature winding is Ra=0.39 , resistance of the field winding is Rf=137 0. Find the speed of the motor at rated load with armature current 43 A. *
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