Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 3, Problem 3.3Q
To determine
The relationship between electrical frequency and magnetic field speed for an ac machine.
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Explain in detail how AC motors develop a rotating magnetic field.
The total conductor of the direct current generator shown in the figure is 1440. The length of the armature is 30cm, the magnetic flux of a pole is 0.8 Tesla and the armature rotates at a speed of 4 m / s. Find the value of the voltage generated by the armature according to the position in the figure.
Determine the power output of a DC armature having 1152 lap
connected conductors carrying 150 A and rotating at 300 rpm in a 12
pole field. The flux per pole is 60 mwb.
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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- A 4 poles lap wound, DC machine has 728 active conductors running at 1800 rpm. The flux per pole is 30 mWb. The armature current is 120A, what is the electromagnetic power developed in the armature in kW?arrow_forwardAn 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?arrow_forwardA separately-excited dc generator develops 288 volts at a certain flux and at a certain speed. What should be the new generated voltage in volts for this machine if the speed is changed to 85 % of the original value and the flux is increased by 67 % from the original value?arrow_forward
- A 4 pole lap wound dc machine has 728 active conductors running at 1800 rpm. The flux per pole is 30mWb, The armature current is 120 A, What is the electromagnetic power developed in the armature?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) A 4 nole wove woun rmoture bos 72 slets il cides ner elot ooch coil hos four turne Ifarrow_forwardA self-excited DC generator has lost its residual magnetism and therefore cannot work (cannot build-up voltage), How would you restore this residual magnetism and make it work again?arrow_forward
- Also explain what is magneto motive force???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_forwardno more than 50 words. How would you reverse the polarity of a self-excited DC generator?arrow_forward
- Explain distribution of flux and magnetic motive force in AC machines?arrow_forwardno more than 50 words. A self-excited DC generator has lost its residual magnetism and therefore cannot work (cannot build-up voltage), How would you restore this residual magnetism and make it work again?arrow_forwardExplain how the magnetization curve is measured for a dc machine.arrow_forward
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