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A DC series motor, connected to a 440 V supply, runs at 900 r/min when taking a current of 70 A. Determine the value of resistor, which when inserted in series with the motor, will reduce the speed to 550 r/min, the gross torque being a third of the previous value. The resistance of the motor is 0.2 ohm.

A DC series motor, connected to a 440 V supply, runs at 900 r/min when taking a current of 70 A. Determine the value of resistor, which when inserted in series with the motor, will reduce the speed to 550 r/min, the gross torque being a third of the previous value. The resistance of the motor is 0.2 ohm.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Electrical Machines Q2

A DC series motor, connected to a 440 V supply, runs at 900 r/min when taking a current of 70 A. Determine the value of resistor, which when inserted in series with the motor, will reduce the speed to 550 r/min, the gross torque being a third of the previous value. The resistance of the motor is 0.2 ohm.
Transcribed Image Text:A DC series motor, connected to a 440 V supply, runs at 900 r/min when taking a current of 70 A. Determine the value of resistor, which when inserted in series with the motor, will reduce the speed to 550 r/min, the gross torque being a third of the previous value. The resistance of the motor is 0.2 ohm.
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