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A dc shunt motor has a rated voltage of 420V and draws a rated line current of 42 A. The full load speed is 900 rev/min. The armature resistance of the motor is 0.4 2 and the field current is 2.5 A. The rotational losses are 780 W. The load of the motor is bi-directional. Assume that the field constant: (KO) remains the same. When the machine is working as a motor, calculate the developed torque and the no load а. speed of the motor. b. If the armature current is 60 A during a regenerative braking, calculate the motor speed and the torque developed during regenerative braking Show on the speed- torque characteristics operating points. C.

A dc shunt motor has a rated voltage of 420V and draws a rated line current of 42 A. The full load speed is 900 rev/min. The armature resistance of the motor is 0.4 2 and the field current is 2.5 A. The rotational losses are 780 W. The load of the motor is bi-directional. Assume that the field constant: (KO) remains the same. When the machine is working as a motor, calculate the developed torque and the no load а. speed of the motor. b. If the armature current is 60 A during a regenerative braking, calculate the motor speed and the torque developed during regenerative braking Show on the speed- torque characteristics operating points. C.

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
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A dc shunt motor has a rated voltage of 420V and draws a rated line current of 42 A. The full load speed is 900 rev/min. The armature resistance of the motor is 0.4 2 and the field current is 2.5 A. The rotational losses are 780 W. The load of the motor is bi-directional. Assume that the field constant: (Ko) remains the same. When the machine is working as a motor, calculate the developed torque and the no load speed of the motor. а. b. If the armature current is 60 A during a regenerative braking, calculate the motor speed and the torque developed during regenerative braking С. Show on the speed- torque characteristics operating points.
Transcribed Image Text:A dc shunt motor has a rated voltage of 420V and draws a rated line current of 42 A. The full load speed is 900 rev/min. The armature resistance of the motor is 0.4 2 and the field current is 2.5 A. The rotational losses are 780 W. The load of the motor is bi-directional. Assume that the field constant: (Ko) remains the same. When the machine is working as a motor, calculate the developed torque and the no load speed of the motor. а. b. If the armature current is 60 A during a regenerative braking, calculate the motor speed and the torque developed during regenerative braking С. Show on the speed- torque characteristics operating points.
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