Q3A 250 V DC shunt motor has armature resistance of 0.250. It takes an armature current of 50 A runs at 750 r.p.m. If the flux of the motor is reduced by 10% without changing the load torque.find: 1-Draw the equivalent circuit of the shunt DC motor. 2-The new speed of the motor. 3-The developed torque,when Pmech.losses=zero

Q3A 250 V DC shunt motor has armature resistance of 0.250. It takes an armature current of 50 A runs at 750 r.p.m. If the flux of the motor is reduced by 10% without changing the load torque.find: 1-Draw the equivalent circuit of the shunt DC motor. 2-The new speed of the motor. 3-The developed torque,when Pmech.losses=zero

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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Q4) What is the effect in series motor if you assume V = Eb , with low resistance fielding winding ? a) b) The given information about series motor on full – load (with that the flux is proportional to the field current) is a ) takes ( 78A) and runs at (850 r.p.m) , the series winding resistance is (0.04 2) , with diverter in parallel with the field winding is a (0.18 2) and the armature resistance is (0.09 S2). ( 220 V Neglected the iron, friction and windage losses. Determine the efficiency , speed when developing full load torque ,the maximum efficiency .
Subject: Electrical Machines
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