A 50-hp, 250-V, 1200-rpm DC shunt motor has an armature resistance (including the brushes, compensating windings and interpoles) of 0.06 O. Its field circuit has a total resistance Radj + RF of 50 Q, which produces a no-load speed of 1200 rpm. Given that the armature reaction at full load is equivalent to 0. 7 A.field-current. The magnetization data at 1200 rpm is tabulated in TABLE Q1. Calculate the speed and output torque of this motor when its input current is 200 A for the following conditions: а. With compensating windings b. Without compensating windings С. Discuss the different of speed and torque obtained in part (a) and part (b). Justify your answer. TABLE Q1 Ea, (V) 100 230 250 290 Ii, (A) 1.6 4.3 5.0 8.9

A 50-hp, 250-V, 1200-rpm DC shunt motor has an armature resistance (including the brushes, compensating windings and interpoles) of 0.06 O. Its field circuit has a total resistance Radj + RF of 50 Q, which produces a no-load speed of 1200 rpm. Given that the armature reaction at full load is equivalent to 0. 7 A.field-current. The magnetization data at 1200 rpm is tabulated in TABLE Q1. Calculate the speed and output torque of this motor when its input current is 200 A for the following conditions: а. With compensating windings b. Without compensating windings С. Discuss the different of speed and torque obtained in part (a) and part (b). Justify your answer. TABLE Q1 Ea, (V) 100 230 250 290 Ii, (A) 1.6 4.3 5.0 8.9

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

A 50-hp, 250-V, 1200-rpm DC shunt motor has an armature resistance (including the
brushes, compensating windings and interpoles) of 0.06 Q. Its field circuit has a total
resistance Radj + RF of 50 Q, which produces a no-load speed of 1200 rpm. Given that the
armature reaction at full load is equivalent to 0. 7 A.field-current. The magnetization data
at 1200 rpm is tabulated in TABLE Q1. Calculate the speed and output torque of this
motor when its input current is 200 A for the following conditions:
a.
With compensating windings
b.
Without compensating windings
С.
Discuss the different of speed and torque obtained in part (a) and part (b). Justify
your answer.
TABLE Q1
Ea, (V)
100
230
250
290
It, (A)
1.6
4.3
5.0
8.9

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