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)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

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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