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.

What are the differences between salient pole and non-salient pole synchronous generators?

Non-Salient pole generators will have smaller diameter and longer axial length. They are used for High speed operation (typically speed will be 1500 and 3000 rpm) Better in dynamic balancing because of absence of salient poles. Non-Salient pole generators are used in Thermal,Gas and in Nuclear Power plants.

Which is true about smooth cylindrical non-salient pole rotor in synchronous generator?

Cylindrical rotors are used in high speed electrical machines, usually 1500 RPM to 3000 RPM. Windage loss as well as noise is less as compared to salient pole rotors. Damper windings are not needed in non-salient pole rotors. Flux distribution is sinusoidal and hence gives better emf waveform.

Why does the synchronous motor always run at synchronous speed?

However when it is provided with some prime mover ,which rotates it up to 80\% of synchronous speed, then it continues to rotate at synchronous, speed even after prime mover is. It happens so because rotor poles are locked with rotating magnetic field and hence the speed is always synchronous.

What is cylindrical rotor synchronous machine?

A cylindrical rotor is made from solid forgings of high-grade nickel chrome molybdenum steel forgings of high-grade nickel chrome molybdenum steel. The poles are created by the current flowing through the windings. They are used for high-speed applications as they have less number of poles.

What is salient pole synchronous motor?

In a salient pole synchronous machine armature winding is on the stator and field winding is on the rotor. The term salient means ‘projecting’. A salient-pole consists of poles that are projected out from the surface of the rotor core. These are used for the rotors for four or more poles.

What is salient pole type rotor?

Salient pole type of rotor consist of large number of projected poles (salient poles) mounted on a magnetic wheel. They are larger in diameter and smaller in axial length. Non-salient pole rotors are cylindrical in shape having parallel slots on it to place rotor windings.