(b) Derive the transformations for currents between a rotating balanced two phase(a,ẞ) winding and a pseudo stationary two phase (d,q) winding. (assume equalturns on all coils). From power invariance, show that the voltage transformationsare identical to those for the currents.Describe, from physical concepts, how the transformation may be used to represent athree phase synchronous machine. Explain how torque is developed.

Answered: Image /qna-images/answer/082b9fc6-650e-4a50-9ecc-cc8e292b9573.jpg

Answered: (b) Derive the transformations for…

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

The shunt field winding of a shunt generator has a resistance of 80 ohms at 20⁰C. After several hours of continuous operation, the winding temperature rises to 50⁰C. How much is the winding resistance under this condition, Assume the resistance temperature coefficient of copper to be 0.004 ohm per degree at 0⁰C.
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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 Q, the shunt field resistance is 200 Q and there is a brush contact voltage drop of 1 V at each brush on full- [0.162 Wb] 5. load. Calculate the flux in a 4-pole dynamo with 722 armature conductors generating 500 V when running at 1000 r.p.m. when the armature is (a) lap connected (b) wave connected. [(a) 41.56 mWb (b) 20.78 mWb] (City & Guilds, London) 7. A 4-pole machine running at 1500 r.p.m. has an armature with 90 slots and 6 conductors per slot. The flux per pole is 10 mWb. Determine the terminal e.m.f. as d.c. Generator if the coils are lap-connected. If the current per conductor is 100 A, determine the electrical power. [810 V, 324 kW] (London Univ.) 8. An 8-pole lap-wound d.c. generator has 120 slots having 4 conductors per slot. If each conductor can carry 250 A and if…
Question 43
Example : In a 110 V, d.c. compound generator, the resistance of the armature, shunt field and series field are 0.06 , 25 and 0.04 respectively. The load consists of 200 lamps each rated at 55 W, 110 V. Find the total e.m.f. generated and the armature current when the machine is connected in (a) long shun
A 4 pole, lap wound, d.c. generators has 42 coils with 8 turns per coils. It is driven at 1120 r.p.m. If useful flux per pole is 21 mWb, calculate the generated e.m.f. Find the speed at which it is to be driven to generate the same e.m.f. as calculated above, with wave wound armature.
For 6 polar D.C machine armature has 36 number of slots and the type of winding is a double layer simplex lap winding. a. How many coils are present? b. What is the coil span in terms of number of slots? c. If each coil has 4 turns, then what is the total number of armature conductors presents? d. How many parallel paths will be their in the armature? e. Altogether how many brushes will be their?
A d.c.series generator has armature resistance of 0.5Q and series field resistance of 0.032.It drives a load of 50 A.If it has 6 turns/coil and total 540 coils on the armature and is driven at 1500 r.p.m.,calculate the terminal voltage at the load.Assume 4 poles, lap type winding, flux per pole as 2 mWb and total brush drop as 2 V.
Two shunt generators A and B operates in parallel and their load characteristicsmay be taken us straight lines. The voltage of the generator A falls from 240 V atno-load to 220 V at 200 A while that of B falls from 245 V at no load to 220 V at150 A. Determine the current which each machine supplies to a common load of300 A and the bus-bar voltage at this load.
5. An 8-pole lap wound armature has 960 conductors and is run at 500 rpm. If the flux per pole is 40 mWb. Find the emf generated.a. 320 Vb. 315 Vc. 310 Vd. 318 V
A d.c. generator has an armature e.m.f. of 100 V when the useful flux per pole is 20 mWb and the speed is 800 r.p.m. calculate the generated e.m.f. (i) with the same flux and a speed of 1000 r.p.m. (ii) with a flux per pole of 24 mWb and a speed of 900 r.p.m.

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