The total armature current carried by a 50-hp, 4-pole, 230-V motor is 180 A. If thewinding is wave, how much current is handled by each path and by each brusharm if there are (a) 4 brush arms? (b) 2 brush arms? Determine the commutator pitches for the following wave-wound armatures: (a)75 segments, 4 poles; (b) 93 segments, 4 poles; (c) 229 segments, 6 poles.

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Answered: The total armature current carried by a…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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An 8-pole, 460 V shunt motor has 600 lap-wound conductor. It takes 45 A from the supply mainsand develops output power of 9 hp. The field winding takes 2 A. The armature resistance is 0.12Ω and the flux per pole is 0.05 W. Calculate the developed torque and shaft torque.
A 220 V shunt motor has an armature resistance of 0.4 ohm and field resistance of 140 ohm. The motor draws 6 A at 1600 rpm at no load. Calculate the speed and shaft torque if the motor draws 52 A at rated voltage.
The overall efficiency of a 4-pole DC motor is 83.5% when running at a speed of 550 rpm. The motor takes a current of 65A from the supply. If the motor’s armature and series field resistance add to 0.25-ohm, flux per pole 50 mWb, armature winding is wave connected with 1200 conductors, calculate the power at the shaft of this motor.
A dc shunt motor takes 30 A from a 230 V mains. Its efficiency is 80%. If the field resistance is 160 ohms and an armature resistance is 0.4 ohms. Find out the iron and stray power losses
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assume that a series motor is taking the same current with the conditions that 440v motor takes a 25 a and runs at 800 rpm the armature resistance including the resistance of the series winding is 0.77ohms calculate the speed will it run if a 1.88 resistance is connected in series with the supply voltage
Q3 A 4-pole, 500 V shunt motor has 720 wave-connected conductors in the armature.The full-load armature current is 60 A and the flux per pole is 0.03 Wb. The armature resistance is 0.2 Q and the contact drop is 1 V per brush. Calculate the full-load speed of the motor. Q4 A 440 V shunt motor has armature resistance of 0.8 2 and field resistance of 200 2. Determine the back e.m.f. when giving an output of 7.46 KW at 85% efficiency. S A 2 0 KW a50 V 1 1125
A direct current shunt dynamo continuously supplies an ohmic load of 50 Ohm at terminal voltage Vt= 1000 V. The armature winding resistance is 5 Ohm and the shunt pole winding resistance is 200 Ohm. The sum of mechanical losses is 400 W. What is the percent efficiency of the dynamo under these operating conditions? a) 70 b) 74 c) 87 d) 78 e) 85
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The total armature current carried by a 50-hp, 4-pole, 230-V motor is 180 A. If the winding is wave, how much current is handled by each path and by each brush arm if there are (a) 4 brush arms? (b) 2 brush arms?