Example 37.6. A 3-phase, 16-pole alternator has a star-connected winding with 144 slots and 10 conductors per slot. The flux per pole is 0.03 Wb. Sinusoidally distributed and the speed is 375 r.p.m. Find the frequency rpm and the phase and line e.m.f. Assume full-pitched coil.

Example 37.6. A 3-phase, 16-pole alternator has a star-connected winding with 144 slots and 10 conductors per slot. The flux per pole is 0.03 Wb. Sinusoidally distributed and the speed is 375 r.p.m. Find the frequency rpm and the phase and line e.m.f. Assume full-pitched coil.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter31: Three-phase Alternators

Section: Chapter Questions

Problem 1RQ: What conditions must be met before two alternators can be paralleled together?

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Concept explainers

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

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Example 37.6. A 3-phase, 16-pole alternator has a star-connected winding with 144 slots and
10 conductors per slot. The flux per pole is 0.03 Wb. Sinusoidally distributed and the speed is
375 r.p.m. Find the frequency rpm and the phase and line e.m.f. Assume full-pitched coil.

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Please solve , last time i got wrong answer
There are 160 slots in a 3-phase, 8-pole, 50 Hz., star connected alternator. There are 4 conductors in each slot and all the conductors in a phase are connected in series. Coil span is 150° electrical and the flux per pole is 0.08 Weber sinusoidally distributed. Calculate the emf induced per phase.
A three-phase, 4-pole alternator runs at 1,800 RPM. Each phase covers two slots under each pole. The full pitch armature coils have 4 turns per coil and there are 2 coil sides per slot. The flux/pole is 6,000 kilolines distributed sinusoidally. (a) What is the distribution factor? (b) Determine the emf per phase. Ans. 0.966; 494V
9.6 A 3-phase. 16-pole Alternator has 192 stator slots with 8 conductors per slot. The conductors of each phase are connected in series. The coil-span is 150 electrical degrees. If the flux per pole is 0.064 Wb sinusoidally distributed, find the phase and line values of no-load voltage, if the stator is star-connected and the required frequency is 50 Hz.
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3.17. A 200-turn coil is rotating at a speed of 3600 rpm in a 4-pole generator. The flux per pole is 2 mWb. Determine (a) the frequency of the induced emf, (b) the maximum value of the induced emf, (c) the rms value of the induced emf in an ac generator, and (d) the average value of the induced emf in a dc generator.
Full solutions for the question with explanation
9.6 A 3-phase. 16-pole Alternator has 192 stator slots with 8 conductors per slot. The conductors of each phase are connected in series. The coil-span is 150 electrical degrees. If the flux per pole is 0.064 Wb sinusoidally distributed, find the phase and line values of no-load voltage, if the stator is star-connected and the required frequency is 50 Hz. [Ans : Kp = 0.966: Ka = 0.958: E = 3367: E₁ = 5830] 9.7 A 4-pole, 50 Hz, 3-phase, star-connected Alternator has 60 slots with 2 conductors per slot. The winding is short-chorded by 2 slots. If the sinusoidally distributed flux per pole is 0.062 Wb, calculate the no-load terminal voltage. [Ans : Kp = 0.973 : Ka = 0.956: E=257.54 E₁ = 446.07] 9.8 An eight pole, 3-phase, 60° phase-spread, double layer winding has 72 coils in 72 slots. The coils are short-chorded by 2 slots. Calculate the winding factors for the fundamental and the third harmonic. : [Ans Kp1 = 0.9397: Kd₁ = 0.9597: Kp3 = 0.5: Kd3 = 0.667] 9.9 Calculate the rms value of the…
AC Machinery Fundamentals A three-phase delta-connected six-pole winding is installed in 36 slots on a stator. There are 150 turns of wire in each slot of the windings. All coils in each phase are connected in series. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 1000 r/min. What are the resulting phase and terminal voltages?
A 6-pole ,3 phase , 60 cycle alternator has 12 slots per pole and four conductor per slot. The winding is 5/6 pitch. There are 2,500,000 Maxwell ( 0.025 weber ) entering the armature from each north pole, and this flux sinusoidally distributed along the air gap. The armature coils are all connected in series , The winding is wye connected. Determine the open circuit emf of the alternator.
A 3-phase 4-pole alternator has a single layer full-pitch winding with 8 conductors per slot. The armature has a total of 36 slots. Determine the voltage between lines when the alternator is driven at 1800 rpm with a flux of 0.05 Wb per pole.
9.4 A 3-phase, 16-pole, Alternator has a star-connected winding with 144 slots and 10 conductors per slot. The flux per pole is 0.03 Wb sinusoidally distributed and the speed is 375 rpm. The winding is short chorded by 1 slot. Calculate the no-load terminal voltage. [Ans: 2617.9]