A 50 hp, 250 V, 1200 r/min DC Shunt Motor with an armature resistance of 0.08 Q. Its field circuit has a total resistance (Radj + R) of 100 N, which produces no-load speed of 1200 r/min. (i) (b) Calculate the motor speeds when the input current at 100A, 200A and 300A. (ii) Using the result obtained from Q3(b)(i) plot the torque-speed curve of the motor. (iii) The motor in Q3(b) is now connected separately excited. The motor is initially running VA = 250 V, IA = 120 A and n= 1103 r/min, while supplying a constant torque load. Determine the speed of this motor be if VA is reduced to 200 V.

A 50 hp, 250 V, 1200 r/min DC Shunt Motor with an armature resistance of 0.08 Q. Its field circuit has a total resistance (Radj + R) of 100 N, which produces no-load speed of 1200 r/min. (i) (b) Calculate the motor speeds when the input current at 100A, 200A and 300A. (ii) Using the result obtained from Q3(b)(i) plot the torque-speed curve of the motor. (iii) The motor in Q3(b) is now connected separately excited. The motor is initially running VA = 250 V, IA = 120 A and n= 1103 r/min, while supplying a constant torque load. Determine the speed of this motor be if VA is reduced to 200 V.

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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Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

A 50 hp, 250 V, 1200 r/min DC Shunt Motor with an armature resistance of 0.08 Q.
Its field circuit has a total resistance (Radj + R) of 100 Q, which produces no-load
speed of 1200 r/min.
(i)
(b)
Calculate the motor speeds when the input current at 100A, 200A and 300A.
(ii)
Using the result obtained from Q3(b)(i) plot the torque-speed curve of the
motor.
(iii)
The motor in Q3(b) is now connected separately excited. The motor is initially
running VA = 250 V, IĄ = 120 A and n= 1103 r/min, while supplying a constant
torque load. Determine the speed of this motor be if Va is reduced to 200 V.

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