A 150 hp, 600 volt, 600 rpm de series- wound railway motor has a combined field and armatureresistance (including brushes) of 0.165 N. The full-load current at rated voltage and speed is186 amps. The magnetization curve at 400 rpm is as follows:Generated emf (V) | 375 400 425 450 475Field current (A) | 169 | 194 || 225 | 261 | 300Determine the internal starting torque when the starting current is limited to 400 amps. Assumethe armature reaction to be equivalent to a demagnetizing mmf which varies with the squareof the current. (Note: 1 hp = 746 W.)

We have to find the value of internal starting torque according to given conditions.

A 150 hp, 600 volt, 600 rpm de series-wound railway motor has a combined field and armature resistance (including brushes) of 0.165 N. The full-load current at rated voltage and speed is 186 amps. The magnetization curve at 400 rpm is as follows: Generated emf (V) 375 400 425 450 Field current (A) | 169 | 194 | 225 | 261 | 300 475 Determine the internal starting torque when the starting current is limited to 400 amps. Assume the armature reaction to be equivalent to a demagnetizing mmf which varies with the square of the current. (Note: 1 hp = 746 W.)

A 150 hp, 600 volt, 600 rpm de series-wound railway motor has a combined field and armature resistance (including brushes) of 0.165 N. The full-load current at rated voltage and speed is 186 amps. The magnetization curve at 400 rpm is as follows: Generated emf (V) 375 400 425 450 Field current (A) | 169 | 194 | 225 | 261 | 300 475 Determine the internal starting torque when the starting current is limited to 400 amps. Assume the armature reaction to be equivalent to a demagnetizing mmf which varies with the square of the current. (Note: 1 hp = 746 W.)

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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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

Question

100%

A 150 hp, 600 volt, 600 rpm de series- wound railway motor has a combined field and armature
resistance (including brushes) of 0.165 N. The full-load current at rated voltage and speed is
186 amps. The magnetization curve at 400 rpm is as follows:
Generated emf (V) | 375 400 425 450 475
Field current (A) | 169 | 194 || 225 | 261 | 300
Determine the internal starting torque when the starting current is limited to 400 amps. Assume
the armature reaction to be equivalent to a demagnetizing mmf which varies with the square
of the current. (Note: 1 hp = 746 W.)

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