Q5/ A 3-phase, 415V, 4-pole, 50Hz star connected S.M has a synchronous impedance of 0.72+j6/phase. The machine takes a current of 50A at power factor of 0.8 leading. Find the excitation emf and its angle. If the load angle at no-load is 1.5 mechanical degree with same excitation voltage. Find the net torque developed by the motor.

Q5/ A 3-phase, 415V, 4-pole, 50Hz star connected S.M has a synchronous impedance of 0.72+j6/phase. The machine takes a current of 50A at power factor of 0.8 leading. Find the excitation emf and its angle. If the load angle at no-load is 1.5 mechanical degree with same excitation voltage. Find the net torque developed by the 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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Question

Correct the solution
powci U1 12UAW at v.
R 1
K
Q5/A 3-phase, 415V, 4-pole, 50Hz star connected S.M has a synchronous impedance of
0.72+j6/phase. The machine takes a current of 50A at power factor of 0.8 leading. Find the
excitation emf and its angle. If the load angle at no-load is 1.5 mechanical degree with same
excitation voltage. Find the net torque developed by the motor.
PNo-Loed
prom
346
at hold
50 = Vo
4/5
3x1 Sin 3-1502-255
6
8
PNo Lay = √3 IV CO
Pro Las
Iz
1502-255
Cos √3x415X0-8
I=0=2108A I=2-612 A
PCu = 3I³R = 5.528
PFW POLY- Pc =1-45k

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Step 1: Given data:-

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Step 2: Calculating the excitation EMF:-

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Step 3: Calculating the new armature current:-

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Step 4: Calculating output power:-

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Step 5: Calculating the net torque:-

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