What is the advantage of salient pole in an alternator?

reduced noise.

What is the feature of salient pole rotor used in an alternator?

The salient pole type of rotor is generally used for slow speed machines having large diameters and relatively small axial lengths. The poles, in this case, are made of thick laminated steel sections riveted together and attached to a rotor with the help of joint.

What is a salient pole alternator?

Salient Pole Synchronous Alternator: Salient pole Generators will have large diameter and short axial length. Pole shoes cover 2/3 of the pitch. Salient Poles are laminated in order to reduce eddy currents. They are used in hydraulic turbines or diesel engines.

What is salient pole rotor?

What are Salient Pole rotors? Salient pole rotors are large in diameter and shorter in length. They are typically used in lower speed electrical machines (100 RPM to 1500 RPM). Salient pole rotors normally require damper windings to avoid oscillations of rotors during operation.

Why do cylindrical rotor alternators operate with steam turbines?

Why do cylindrical Alternators operate with steam turbines? Steam turbines are found to operate at fairly good efficiency only at high speeds. The hig h speed operation of rotors tends to increase mechanical losses and so the rotors should have a smooth external surface.

Why salient pole rotor is used for low and medium speed and non-salient pole rotor is used for high speed synchronous generators?

Salient pole rotors have large diameter and shorter axial length. They are generally used in lower speed electrical machines, say 100 RPM to 1500 RPM. Flux distribution is relatively poor than non-salient pole rotor, hence the generated emf waveform is not as good as cylindrical rotor.

What are the prime movers used for a salient pole alternator and non salient pole alternator?

The prime movers used for salient pole alternators are water wheels like Kaplan turbine, Francis turbine, Pelton wheel etc., and diesel or petrol engines. The prime movers used for non-salient pole alternators are steam turbines and gas turbines.

Why salient pole rotor is used for low and medium speed and non salient pole rotor is used for high speed synchronous generators?

Is salient pole Constructionof rotor of alternator provides better balance and less noisy operation?

The solid field poles themselves acts as damper therefore cylindrical alternator does not required damper winding. The cylindrical rotor has small diameter and long axial length in order to avoid excessive velocity. The cylindrical construction of the rotor gives better balance and noiseless operation.

Why alternators are termed as synchronous generators?

In case of alternator, the RMF speed matches the rotor speed, since the rotor field circuit generates a constant magnetic field, hence it is also called synchronous generator.

Why an alternator is called a synchronous machine?

The rotating magnetic field induces an AC voltage in the stator windings. Since the currents in the stator windings vary in step with the position of the rotor, an alternator is a synchronous generator. Since the permanent magnet field is constant, the terminal voltage varies directly with the speed of the generator.

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