Numerical Problems 1. A four-pole, lap wound DC machine is having 500 conductors on its armature and running at 1000 rpm. The flux per pole is 30 m Wb Calculate the voltage induced in the armature winding. What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V, 500) 2. A 4-pole machine has an armat

Numerical Problems 1. A four-pole, lap wound DC machine is having 500 conductors on its armature and running at 1000 rpm. The flux per pole is 30 m Wb Calculate the voltage induced in the armature winding. What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V, 500) 2. A 4-pole machine has an armat

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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DC MACHINE TORQUE The armature of a dc motor has 648 conductors, 65 % of which are directly under thepole where the flux density is 48,000 lines per in2. If the core diameter is 7 inchesand its length is 4 inches and the current in each conductor is 20 A. What is thetorque exerted in the armature in N-m?
A 230 V dc machine has an emf constantand . The field is separatelyexcited and produces 0.01 Wb per pole. for all parts ofthe problem. (a) At what speed does the machine operate as adc generator with rated terminal voltage? (b) At what speeddoes the machine operate as a dc motor with rated terminalvoltage? (c) If an external resistance is added in serieswith the armature circuit, at what speed does the machineoperate as a dc motor with rated terminal voltage? (d) If themotor of part (b) is known to be supplying 10 HP to a coupledmechanical load, determine the rotational losses at the point ofoperation ***Any two branches please do not be late
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A four-pole generator, having wave-wound armature winding has 51 slots, each slot containing 20 conductors. What will be the voltage generated in the machine when driven at 1500 rpm assuming the flux per pole to be 7.0mWb ? If the armature current is 320 A, what is the power developed in the armature? And what is torque provided by the prime mover?
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The armature of a dc motor has 648 conductors, 65 % of which are directly under the pole where the flux density is 48,000 lines per in2. If the core diameter is 7 inches and its length is 4 inches and the current in each conductor is 20 A. What is the torque exerted in the armature in N-m?
A 6 pole, wave wound DC shunt generator has a useful total flux of 420 mWb. The armature winding consists of 220 turns each of 0.004 Q resistance, when running at 900 RPM the armature current is 50 A. If the armature winding reconnected as lap calculate the terminal voltage in case of wave and lap given that the field circuit and the speed kept same.
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A 4 pole d.c. The motor has a wave-wound armature winding. The value of flux per pole is 60 mWb. The number of armature conductors is 250. When the motor is supplied with 230 volts, the armature carries a current of 40 A. So find the speed of the motor and the back emf produced in it. . Assume armature impedance 0.6 ohm.
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