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The following motor parameters: Ra = 0.013 fl, La = 0.41 mH, 998.3 kW, 300V, rated current = 1333 A, 380 rpm, Brush voltage drop = 3 V, Field power input = 20 kW, , Machine frictional torque coefficient = 12 N- m/(rad/sec). This is a DC Motor (separately-excited) is delivering rated torque at rated speed. Keep in mind the field current is constant and the armature voltage is variable. a) Find the Rated Shaft Torque T;? b) Find the Friction Torque Tf? c) Find the electromagnetic torque for this DC motor? d) Find Va if Kt = 6.6 N.m/A? e) Find the efficiency of the motor at this operating point. f) Determine the electrical time constant of the DC motor.

The following motor parameters: Ra = 0.013 fl, La = 0.41 mH, 998.3 kW, 300V, rated current = 1333 A, 380 rpm, Brush voltage drop = 3 V, Field power input = 20 kW, , Machine frictional torque coefficient = 12 N- m/(rad/sec). This is a DC Motor (separately-excited) is delivering rated torque at rated speed. Keep in mind the field current is constant and the armature voltage is variable. a) Find the Rated Shaft Torque T;? b) Find the Friction Torque Tf? c) Find the electromagnetic torque for this DC motor? d) Find Va if Kt = 6.6 N.m/A? e) Find the efficiency of the motor at this operating point. f) Determine the electrical time constant of the DC motor.

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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The following motor parameters: Ra = 0.013 fl, La = 0.41 mH, 998.3 kW, 300V, rated current = 1333 A, 380 rpm, Brush voltage drop = 3 V, Field power input = 20 kW, , Machine frictional torque coefficient = 12 N- m/(rad/sec). This is a DC Motor (separately-excited) is delivering rated torque at rated speed. Keep in mind the field current is constant and the armature voltage is variable. a) Find the Rated Shaft Torque T;? b) Find the Friction Torque Tf? c) Find the electromagnetic torque for this DC motor? d) Find Va if Kt = 6.6 N.m/A? e) Find the efficiency of the motor at this operating point. f) Determine the electrical time constant of the DC motor.
Transcribed Image Text:The following motor parameters: Ra = 0.013 fl, La = 0.41 mH, 998.3 kW, 300V, rated current = 1333 A, 380 rpm, Brush voltage drop = 3 V, Field power input = 20 kW, , Machine frictional torque coefficient = 12 N- m/(rad/sec). This is a DC Motor (separately-excited) is delivering rated torque at rated speed. Keep in mind the field current is constant and the armature voltage is variable. a) Find the Rated Shaft Torque T;? b) Find the Friction Torque Tf? c) Find the electromagnetic torque for this DC motor? d) Find Va if Kt = 6.6 N.m/A? e) Find the efficiency of the motor at this operating point. f) Determine the electrical time constant of the DC motor.
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