A 50-HP, 600-V compound motor, taking 80 A, operates at a speed of 495 r.p.m. at full-load. If the fluxper pole is 9.1 x 106 Maxwells and the armature resistance is 0.01502, the field resistances are 0.006ohms and 300 ohms. Calculate:a. Field currents and the armature currentb. the counter emfc. the rotational lossAns.[2A,78A,593.362 V,8982.236 W]

Note: The given answer in question (593.362 V) suggests an unaccounted voltage drop, possibly due to…

Answered: A 50-HP, 600-V compound motor, taking…

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 230 V dc series motor has an armature resistance of 0.2 ohm and field resistance of 0.1 ohm at rated voltage. The motor draws a line current of 40 amperes and runs at a speed of 1000 rpm. Find speed of the motor for line current of 20 A at 230 V. Assume that flux at 20 A line current is 60% of flux at 40 A line current.
Q4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core Mc
A d.c. series motor is running whith a speed of 800 r.p.m. while taking a current of 20 A from the supply. If the load is changed such that the current deawn by the motor is increased to 50 A , calculate the speed of the motor on new load . The armature and series field winding resistances are 0.2 ohm and 0.3 ohm respectively . Assume the flux produced is proportional to the current . Assume supply voltage as 250 V
6. The motion in DC motor can be increased by the following factors... (you may choose more than one) * a) Using a stronger magnet b) Increasing the potential difference c) Increasing the current d) Increasing the number of turns on the coil
A DC series motor, running a fan at 1000 rpm, take 50 A from 250 V mains. The armature plus field resistance is 0.6 Q. If an additional resistance of 4.4 Q is inserted in series with the armature circuit, the motor speed (approximately) in case the field flux is proportional to armature current is rpm.
1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn
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A DC series motor operates at 800rpm with a line current of 100A from 230V mains supply. Its armature and field resistances are 0.15 ohms and 0.1 ohms respectively. Find the speed at which motor runs at a line current of 25A, assuming the flux at this current is 45% of the flux at 100A.
A 500 V, lap wound d.c. A shunt motor has 90 slots and each has 8 conductors. When the motor delivers full load it draws a current of 30/ A from the line. The field and armature resistances are 250 ohm and 0.4 ohm respectively. If the fixed resistance is 27.1 mWh, find the speed of the motor and the torque produced.
A 220-V DC series motor takes 40-A when running at 700-RPM. The armature and field resistances are 0.51-oh and 0.1-ohm, respectively. The speed of this motor in RPM if the field is shunted by a resistance equal to the fie resistance and load torque is the same is nearest to;. A. 780 B. 880 C.980 D.990
A 220 V , 60 Hz , supply is connected to 200 – turn armature winding of reluctance 1.7x105 At / Wb . Find : the magnetizing reactance the rms values of the ( magneto – motive force , exciting and armature currents , magnetic fluxflu the inductance Draw the phasor diagram of the circuit
A DC motor is initially at rest and is then connected to a 12V battery. The motor has aresistance of 2 Ohms and an inductance of 0.5 Henrys. The motor has a torque constant of0.1 Nm/A and a back EMF constant of 0.1 V/(rad/s). Determine the current through themotor as a function of time, and the time it takes for the motor to reach 90% of its finalsteady-state speed.

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