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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Similar questions

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. *
A 10 kW, 250V shunt motor has an armature resistance of 0.5ohm and a field resistance of 200ohm. At no load and rated voltage, the speed is 1200 rpm and the armature current is 3A. At full load and rated voltage, the current line is 47A and because of armature reaction, the flux is 4% less than it no load value. (a.) What is the full load speed? (b.)What is the developed torque at full load? 1158 rpm
45) A 40hp, 440V, four pole dc motor has an armature wave-wound with 846 conductors and the commutator has 141 segments. The full load efficiency is 85% and the shunt current is 1.25A. If the brushes are shifted backward through segments from the geometric neutral axis, calculate (a) The demagnetizing ampere-turns per pole (b) The distorting ampere-turns per pole on full load.
[Q4 A] A 3 phase, 440v, 1740 rpm, 60Hz, 4-pole, SRIM. has the following parameters -Per phase: R₁=0.250, R₂e=0.20, X₁-X2e-0.50, X-300, the rotational losses are 1700W, with the motor terminals short circuited. Find: Starting torque. Motor efficiency at full load
Estimate the generated e.m.f. if, the speed increases to 1280rev/min and the pole flux remains unchanged. Q24. A 220V D.C. shunt motor has an armature resistance of 0.52 and is excited to produce constant flux. At full load the motor runs at 1000 rpm taking an armature current of 40A. i) If a resistance of 0.82 is inserted in series with the armature, Calculate the generated emf. ii) Estimate speed at full load if the load torque is constant.
A 220V. 4-pole, lap-connected, shunt motor with 800 conductors in armature slots. The armature and shunt field resistance are 0.60 and 2200 respectively. The motor runs to supply load with 8000W and draw current (50amps) from the mains. The flux per pole is 25mWb A- Calculate the gross torque developed by the armature, the shaft torque (useful), and the lost torque. B- Calculate the gross power developed by the armature, the iron and friction lost power, mechanical efficiency, electrical efficiency, and the overall efficiency. Armature reaction may be neglected.