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A 250 V dc shunt motor has a rated armature current of 20 A at a speed of 800 rpm. The armature resistance of the motor is 0.3 , the field resistance is 100 2. Assume that the load torque is gravitational. The current of the motor is 25 A at the steady state condition. A dynamic braking technique employing a braking resistance of 1.5 2 is used. Assuming the flux is constant. a) Calculate the constant KØ. b) Calculate the speed at the new steady state operating point. c) Draw the circuit for Dynamic braking of DC shunt motor. d) Draw the speed torque characteristics and label the operating points.

A 250 V dc shunt motor has a rated armature current of 20 A at a speed of 800 rpm. The armature resistance of the motor is 0.3 , the field resistance is 100 2. Assume that the load torque is gravitational. The current of the motor is 25 A at the steady state condition. A dynamic braking technique employing a braking resistance of 1.5 2 is used. Assuming the flux is constant. a) Calculate the constant KØ. b) Calculate the speed at the new steady state operating point. c) Draw the circuit for Dynamic braking of DC shunt motor. d) Draw the speed torque characteristics and label the operating points.

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 250 V de shunt motor has a rated armature current of 20 A at a speed of 800 rpm. The armature resistance of the motor is 0.3 , the field resistance is 100 22. Assume that the load torque is gravitational. The current of the motor is 25 A at the steady state condition. A dynamic braking technique employing a braking resistance of 1.5 is used. Assuming the flux is constant. a) Calculate the constant KØ. b) Calculate the speed at the new steady state operating point. c) Draw the circuit for Dynamic braking of DC shunt motor. d) Draw the speed torque characteristics and label the operating points.
Transcribed Image Text:A 250 V de shunt motor has a rated armature current of 20 A at a speed of 800 rpm. The armature resistance of the motor is 0.3 , the field resistance is 100 22. Assume that the load torque is gravitational. The current of the motor is 25 A at the steady state condition. A dynamic braking technique employing a braking resistance of 1.5 is used. Assuming the flux is constant. a) Calculate the constant KØ. b) Calculate the speed at the new steady state operating point. c) Draw the circuit for Dynamic braking of DC shunt motor. d) Draw the speed torque characteristics and label the operating points.
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