3. Find (a) the no-load phase voltage, (b) Kc and (c) Kd of a star- connected, 3-phase, 6-pole alternator which runs at 1200 rpm, having flux per pole of 0.1 Wb sinusoidally distributed. Its stator has 60 slots having double layer winding. Each coil has 8 turns and the coil is chorded by 1 slot.

3. Find (a) the no-load phase voltage, (b) Kc and (c) Kd of a star- connected, 3-phase, 6-pole alternator which runs at 1200 rpm, having flux per pole of 0.1 Wb sinusoidally distributed. Its stator has 60 slots having double layer winding. Each coil has 8 turns and the coil is chorded by 1 slot.

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.

Question

3.
Find (a) the no-load phase voltage, (b) Kc and (c) Kd of a star-
connected, 3-phase, 6-pole alternator which runs at 1200 rpm,
having flux per pole of 0.1 Wb sinusoidally distributed. Its stator has
60 slots having double layer winding. Each coil has 8 turns and
the coil is chorded by 1 slot.

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Step 2: Determine the value of Kc

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Step 3: Determine the value of Kd

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Step 4: Determine the no-load phase voltage

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Step 5: Determine the line voltage

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