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 3.3P
The first ac power system in the United States ran at a frequency of 133 Hz. If the ac power for this system were produced by a four-pole generator, how fast would the shaft of the generator have to rotate?
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1. A six-pole DC generator has an armature winding with 540 conductorsconnected in six parallel paths. Calculate the generated voltage in thismachine if each pole produces 1.56 x 106 maxwells and the armature speed is1,800 rpm.
What will be the frequency (in Hz) for 100kW, 230V, 12-Pole, alternator running at 12 rps?
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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- An alternator has 6 poles and runs at 1,000 rpm (a) what is its generated frequency? (b) What must be its speed if the frequency is to be 25 Hz?arrow_forwardA 220V series generator has an armature resistance of 0.4Ω. If the generated emf is 230V and the drop across the series field winding is 8V, what is the power (in watts) to the load? use two decimal places if the answer is not exact and do not include the unit anymore.arrow_forwardAn alternator has 6 poles. (a) At what speed must the machine be driven to develop 60 cycles? 25 cycles? (b) What frequency is developed if the speed is 1000rpm? Please give the complete solution for this problem. Thank you!arrow_forward
- A 4 pole, 50 Hz star connected alternator has 15 slots per pole and eachslot has 10 conductors. All the conductors of each phase are connected in series and the winding factor being 0.95. When running on no load for a certain flux per pole, the terminal e.m.f. was 1825 volt. If the windings are lap connected as in a D.C. machine, what would be the emf between the brushes for the same speed and the same flux/pole. Assume sinusoidal distributionarrow_forwardCalculate the speed and open-circuit line and phase voltages of a 4-pole, 3-phase, 50-Hz, star-connected alternator with 36 slots and 19 conductors per slot. The flux per pole is 0.019 Wb and is sinusoidally distributed.arrow_forwardA bipolar AC generator is running at 3,600 RPM . What will be the frequency of the voltage wave generated by the machine? a.40 CPS b.50 CPS c.60 CPS d.None of the abovearrow_forward
- A 6-Pole generator operates at 1,200 rpm. a) What frequency does it generate? b) At what speed must the generator to develop 25 cycles?arrow_forwarda 3phase,4-pole,24slots alternator has its armature oil shot pitch by one slot. its pitch factor will be? Subject: Electrical machine 2arrow_forwardGiven : alternator with maximum air-gap flux density of 7,400 gauss; pole pitch = 6.25 in ; axial length of armature = 10 inches ; flux distribution sinusoidal. Calculate the flux per pole.arrow_forward
- A four pole, 1200 rpm DC lap wound generator has 1520 conductors. If the flux per poles is 0.01 Wb. Find the generator emf ?arrow_forwardA 4-pole generator has a wave-wound armature with 722 conductors, and it delivers 100 amperes on full load. If the brush lead is 8°,calculate the armature demagnetizing and cross magnetizing ampere turns per pole. (Our Subject is Electrical Machine 1)arrow_forward) A four-pole synchronous generator is spinning at a mechanical speed of 1500 r/min. What is the electrical frequency generated by the machine?arrow_forward
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