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. They are mostly used in hydropower plants.

Why salient pole rotor is used for low and medium speed?

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. As the rotor speed is lower, more number of poles are required to attain the required frequency.

What are the advantages of salient pole rotor?

reduced noise. reduced windage loss. adoptability to low and medium speed operation.

Why salient pole is used in hydro power plant?

Salient pole machines are suitable to run at low speed. Hence salient pole generators are used in hydropower plants. Non-salient pole-type rotors are used in high-speed alternators having speeds between 1500 rpm to 3000 rpm.

Why salient pole rotor is not used for high speed?

Salient pole machines are not suitable for high speed operations, why? The salient pole rotors cannot withstand the mechanical stresses developed at high speed. The projecting poles may be damaged due to mechanical stresses. vibrations are developed.

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17 related questions found

What is a 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.

How does a salient pole rotor work?

Salient pole rotor

Direct current (DC), from an external exciter or from a diode bridge mounted on the rotor shaft, produces a magnetic field and energizes the rotating field windings and alternating current energizes the armature windings simultaneously.

What are the advantages of salient pole type construction used for synchronous machines?

Advantages of salient-pole type construction are : They allow better ventilation. The pole faces are so shaped that the radial air gap length increases from the pole center to the pole tips so that the flux distribution in the air-gap is sinusoidal in shape which will help the machine to generate sinusoidal emf.

Which rotor is used in hydro power plant?

Salient pole rotor is used by Hydro Generators.

Where are salient pole generators used?

Salient Pole Synchronous Alternator:

They are used in hydraulic turbines or diesel engines. Salient pole generators will have typical speed about 100 to 375 rpm. As the speed of the water turbine is slow hence more number of poles are required to attain the frequency.

What does salient pole mean?

: a magnet pole that projects toward the armature of an electric machine — compare consequent pole.

What are the advantages of providing damper winding?

Damper windings helps the synchronous motor to start on its own (self starting machine) by providing starting torque. By providing damper windings in the rotor of synchronous motor “Hunting of machine”can be suppressed.

What kind of rotor is most suitable for turbo alternator?

What kind of rotor is most suitable for turbo-alternators which are designed to run at high speed? 178. The power developed in the alternator having salient type rotor is less than of having non-salient pole.

What does non salient mean?

adj. 1 prominent, conspicuous, or striking. a salient feature. 2 (esp. in fortifications) projecting outwards at an angle of less than 180°

Why salient type rotors are not used in steam generators?

Question: Why do not we use salient pole alternators in thermal power stations? Answer: Synchronous alternators are easily controlled for speed, and therefore, for phase. As well, synchronous alternators can be made with no electrical contacts, thats why we are getting longer life span.

Which rotor is used in alternator?

There are mainly two types of rotors used in construction of alternator: Salient pole type. Cylindrical rotor type.

Which type of alternators are used in hydro electric power plant?

In hydro-electric plants the type of alternator used is:

• Turbo generator.
• Non salient pole.
• Salient pole.
• Steam turbine generator.

What are the main differences between cylindrical rotor and salient pole rotor synchronous generators?

In general, the Cylindrical Rotor type machines are confined to 2 and 4 pole turbine generators, while salient pole types are built with 4 poles upwards and include most classes of duty. Both classes of machine are similar in Stator construction point of view.

How many types of rotors are there?

The four different rotor types are: Blank & Smooth - Blank and smooth rotors are what you'll find on most passenger vehicles and feature a smooth, blank metal surface all the way around the rotor. Drilled - Drilled rotors feature drilled holes around the metal surface.

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 do you conduct slip test?

Explanation: Slip test is used to determine the q-axis reactance. Explanation: The impedance during slip test is low so the voltage drop will be less and the current will be more. Explanation: Slip test is conducted at low terminal voltage to avoid large slip in the synchronous machines.

What is the purpose of a rotor?

The rotors' primary purpose is to slow down the turning of the car's wheels by utilizing friction. The brake rotor process occurs when calipers squeeze your car's brake pads together.

Why cylindrical rotor is used for high speed?

on the other hand cylindrical rotors are smooth and with very little pole projection hence they are well suited for high speed operations. Thus, salient pole rotors are well suited to low speed large dia machines and smooth cylindrical rotors for high speed small dia machines.

Which is true about salient pole rotor in synchronous generator?

Salient Pole Rotor

Since the rotor is subjected to changing magnetic fields, it is made of steel laminations to reduce eddy current losses. Poles of identical dimensions are assembled by stacking laminations to the required length. A salient pole synchronous machine has a non-uniform air gap.