For a 18600W 2400rpm DC motor, the following values are given: Ra = 0.089 2 (value at room temperature(250C)), La = 0.00144 H, KT = 0.85 Nm / A and KV = 0.851 V / (rad / s)), (In calculations Use the hot resistancevalues at 1000C.) (Take the rated field winding losses as Wf= 210W.)If the motor speed is reduced to 50% of the rated speed (1200rpm), find the inductive voltage,the induced current, the motor efficiency and the motor speed at no load to obtain the ratedtorque at this speed. (Field supply current will be considered constant).IAVVEff%ONLrpm

For a 18600W 2400rpm DC motor, the following values are given: Ra = 0.089 O (value at room temperature (250C)), La = 0.00144 H, KT = 0.85 Nm / A and KV = 0.851 V / (rad / s)), (In calculations Use the hot resistance values at 100oC.) (Take the rated field winding losses as Wf=210W.)

For a 18600W 2400rpm DC motor, the following values are given: Ra = 0.089 O (value at room temperature (250C)), La = 0.00144 H, KT = 0.85 Nm / A and KV = 0.851 V / (rad / s)), (In calculations Use the hot resistance values at 100oC.) (Take the rated field winding losses as Wf=210W.)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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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

For a 18600W 2400rpm DC motor, the following values are given: Ra = 0.089 2 (value at room temperature
(250C)), La = 0.00144 H, KT = 0.85 Nm / A and KV = 0.851 V / (rad / s)), (In calculations Use the hot resistance
values at 1000C.) (Take the rated field winding losses as Wf= 210W.)
If the motor speed is reduced to 50% of the rated speed (1200rpm), find the inductive voltage,
the induced current, the motor efficiency and the motor speed at no load to obtain the rated
torque at this speed. (Field supply current will be considered constant).
I
A
V
V
Eff
%
ONL
rpm

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