Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 3, Problem 3.4Q
What is the equation for the induced torque in an ac machine?
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An 8-pole DC machine has a simplex wave-wound armature containing 200 coils of 10 turns each. The resistance of each turn is 0.01 Ω. The flux per pole is 0.004 Wb.
What is the internal resistance of the armature in ohms?
What is the current absorbed by this machine in amperes at the instant it's connected to a 100 Vdc source?
What is the internally generated torque produced by the armature of this machine in N-m at the instant it's connected to the 100 Vdc source?
With the DC machine connected to the 100 Vdc source, what is the steady state angular speed of the machine in rpm?
What is the internally generated voltage of the armature of this machine at steady state in volts?
The resistance of the field winding(copper wire) of a
DC machine is 0.25 ohm at 25°C. When operating at
full-load, the temperature of the winding is 75 °C. The
temperature coefficient of resistance of copper is
0.00427 per °C at 0°C. Find the resistance of the field
winding at full-load.
A 10 pole lap wound DC armature has a total of 200
conductors each with a current carrying capacity of 10 A.
The average induced emf per conductor is 10 V. The power
rating of the DC machine is
Chapter 3 Solutions
Electric machinery fundamentals
Ch. 3 - What is the principal difference between a...Ch. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - What is the equation for the induced torque in an...Ch. 3 - The simple loop rotating in a uniform magnetic...Ch. 3 - Prob. 3.2PCh. 3 - The first ac power system in the United States ran...Ch. 3 - A three-phase, Y-connected, four-pole winding is...Ch. 3 - A three-phase, -connected, six-pole winding is...Ch. 3 - A three-phase, Y-connected, 60 Hz, two-pole...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A dc shunt generator delivers 50 kw at 250 v, its armature has a 4-pole wave winding with a resistance of 0.01 ohm and its field resistance is 125 ohm. if the number of turns in the armature is 201 and the flux per pole is 0.02 wb, find the voltage generated and the speed of operation. *arrow_forwardDescribe the characteristics and principles of operation of AC and DC generators and the features of a range of different types of power stations.arrow_forwardQ1. Calculate the voltage induced in the armature winding of a 4-pole, lap-wound DC machine having 500 conductors and running at 1,000 rpm. The flux per pole is 30 mWb.? What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V; 500 V)arrow_forward
- An 2 pole, wave connected armature has 550 conductors and its generated e.m.f is 110 V. If the machine is driven at 600 rpm, then the flux per pole in Wb is,arrow_forwardWhy does curving the pole faces in a dc machine contribute to a smoother dc output voltage from it?arrow_forwardQ2) In DC machine, the speed is 800 RPM, the flux per pole is 2 m wb, and it has a Lap winding armature with 6 coils (4 turns conductor per coil) . The DC machine has 2 poles and armature draws lc= 5.5 A. If the winding redesigned as wave winding, find the EA , Tem and Pem and explain what will happen when we change the design from lap to wave winding connection.arrow_forward
- A 4 pole armature of a DC machine has 175 conductors and a flux per pole of 0.1 wb. Find the EMF generated when running at 600 rpm, when the armature is Lap wound.arrow_forwardThe electromagnetic torque developed in a DC machine is 80 Nm for an armature current of 30 A. What will be the torque for a current of 15 A? Assume constant flux. What is the induced emf at a speed of 900 rpm and an armature current of 15 A?arrow_forwardExplain the types of DC generators.arrow_forward
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