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A 140-V DC shunt motor has a field resistance of 140 ohms and an armature resistance of 0.5 ohms. On no-load, the machine operates with full field flux at a speed of 1000 rpm and an armature current of 2.5A. a) Determine the rotational loss of the motor. b) Assuming that the field flux is linearly proportional to the field current; If the motor is required to develop a torque of (Ta=45 N.m ) at 1500 rpm, 1) Calculate the new power developed Pa2 and the new armature current la2 2) Calculate the new value of the field current I2 and calculate the required value of external series resistance in the field circuit. 3) Assuming that the rotational loss is constant, calculate the new efficiency

A 140-V DC shunt motor has a field resistance of 140 ohms and an armature resistance of 0.5 ohms. On no-load, the machine operates with full field flux at a speed of 1000 rpm and an armature current of 2.5A. a) Determine the rotational loss of the motor. b) Assuming that the field flux is linearly proportional to the field current; If the motor is required to develop a torque of (Ta=45 N.m ) at 1500 rpm, 1) Calculate the new power developed Pa2 and the new armature current la2 2) Calculate the new value of the field current I2 and calculate the required value of external series resistance in the field circuit. 3) Assuming that the rotational loss is constant, calculate the new efficiency

Introductory Circuit Analysis (13th Edition)
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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A 140-V DC shunt motor has a field resistance of 140 ohms and an armature resistance of 0.5 ohms. On no-load, the machine operates with full field flux at a speed of 1000 rpm and an armature current of 2.5A. a) Determine the rotational loss of the motor. b) Assuming that the field flux is linearly proportional to the field current; If the motor is required to develop a torque of (Ta=45 N.m ) at 1500 rpm, 1) Calculate the new power developed Pa2 and the new armature current la2 2) Calculate the new value of the field current Ir2 and calculate the required value of external series resistance in the field circuit. 3) Assuming that the rotational loss is constant, calculate the new efficiency
Transcribed Image Text:A 140-V DC shunt motor has a field resistance of 140 ohms and an armature resistance of 0.5 ohms. On no-load, the machine operates with full field flux at a speed of 1000 rpm and an armature current of 2.5A. a) Determine the rotational loss of the motor. b) Assuming that the field flux is linearly proportional to the field current; If the motor is required to develop a torque of (Ta=45 N.m ) at 1500 rpm, 1) Calculate the new power developed Pa2 and the new armature current la2 2) Calculate the new value of the field current Ir2 and calculate the required value of external series resistance in the field circuit. 3) Assuming that the rotational loss is constant, calculate the new efficiency
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