14. A 3-phase, 400 V, star connected synchronous motor with Xd = 5 ohms/phaseand X 4 ohms/phase is connected directly to the supply network. Calculatethe maximum load power that could be put on the shaft, if the field current ofthe motor were reduced to zero.15. The synchronous motor of problem 14 drives a load having a constant power of30 kW. Determine the maximum stable values of torque angle for the given loadpower and applied voltage at minimum value of the emf induced due to excita-tion, Calculate, also, the minimum stator induced emf due to field current corres-ponding to the above load.

Step 1: Step 2: Step 3: Step 4:

Answered: 14. A 3-phase, 400 V, star connected…

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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Similar questions

Calculate the flux per pole required on full-load for a 50 kW, 450 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1 Ω, the shunt field resistance is 200 Ω and there is a brush contact voltage drop of 1 V at each brush on full-load.
Why the Shunt Motor No Load Test (Experiment No. 7) is applicable to machines in which flux is practically constant i.e. shunt & compound wound machines but not for series * ??machines
Generator Armature Field resistance Separately 0.4 excited Shunt Series Long shunt Short shunt 0.6 0.8 1.2 1.4 resistance 120 140 160 180 Series resistance 2.2 2.4 2.6 Hysteresis loss 0.4 0.8 1.1 1.25 1.3 Eddy current loss 1.3 The generated voltage The field circuit voltage The developed torque The efficiency And draw the circuit diagram for all of them Based on the results, which one you should buy and why? 0.3 1.7 0.3 1.2 Rotational loss 1.2 2.2 1.4 0.4 1.5 A 15kW, 280V, 1200 rpm washing machine needs to be fed by a generator in your home Calculate the following for each generator
A 500HP, 720rpm synchronous motor 3980V is connected with a 3-phase zone and excitation is 25A sample 1790 V (EA) voltage is produced in the armature. It has a synchronous reactance of 22 Ω and a torque of 30°. a) What is the voltage value falling on the synchronous reactance? b) What is the line current and power factor drawn by the motor from the mains? c) What is the power produced by the engine? d) What is the torque produced by the motor?
A 4 pole, long-shunt lap wound generator supplies 20 kW at aterminal voltage of 300 V. The armature resistance is 0.03 ohm,series field resistance is 0.04 ohm and shunt field resistance is100 ohm. The brush drop may be taken as 1.0 V per brush. Determinethe emf generated. Calculate also the number of conductors if thespeed is 1200 rpm and flux per pole is 0.01 Weber.
A 4- pole series motor has 944 wave-connected armature conductors.At a certain load the flux per pole is 34.6 mWb and the total mechanical torque developed is 209 Nm.Calculate the line current taken by the motor and the speed at which it will run with an applied voltage of 500 V.Total motor resistance is 3N.
A shunt generator has an output of 22 kW at a terminal voltage of 220 V. armature and shunt field resistances are 0.05 ohm and 44 ohms, respectively. If the copper loss is equal to the core, friction and windage losses at this load, the over-all efficiency of this generator is nearest to
5. Calculate the flux per pole required on full-load for a 50 kW, 400 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1 Ω, the shunt field resistance is 200 Ω and there is a brush contact voltage drop of 1 V at each brush on full-load. Subject Electrical Machine 1
At rated voltage, a 125 kw, 300-V long shunt compound system provides power with a stray power loss of 3.69 kW. The winding resistors are as follows: armature=0.023, series field=0.04, shunt field=75. Under this condition, find the efficiency of the system.
d.c. series motor has a wave wound armature with 180 conductors. The armature resistance and the field winding resistance are 0.10 ohm ando.2 ohm respectively. If the motor is drawing 40 A current at 0.015 Wb flux per pole, then the speed under this condition is 2533.3 rpm 2644.4 rpm 2756.9 rpm 2987.6 rpm O
Example 1: Determine developed torque and shaft torque of 220-V, 4- pole series motor with 800 conductors wave-connected supplying a load of 8.2 kW by taking 45 A from the mains. The flux per pole is 25 mWb and its armature circuit resistance is 0.6 Q.
4-pole DC in series motor, 180 Nm torque. The coil is wavy, at 600 total conductors, and the magnetic flux per electrode is 0.02 Weber. The resistance of the product and log windings is 0.2 ohm and 0.1 ohm, respectively. Calculate the copper knob if the reciprocating force generated is 205 volts

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