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 is a salient pole?

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

What are the differences between salient pole and non-salient pole type alternator?

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.

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 is a 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 alternator?

The term salient means protruding or projecting. 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.

Where is salient pole used?

Where is the salient pole rotor used? About the salient pole rotor speed, it is mainly used for low- and medium-speed output because of its mechanical instability at higher speeds. It is used in hydropower plants. It is also used in water turbine-powered in low-speed generators.

Is cylindrical rotor laminated?

In cylindrical rotor machine, the field winding in the rotor slot is laminated.

Which type of rotor is suitable for low speed alternators salient pole type or cylindrical type rotor?

For the same size, the rating is smaller than the cylindrical type. This rotor is also called as Projected pole type. This is preferred for low-speed alternators ranging from 125 r.p.m to 500 RPM. Separate damper winding is provided.

What are the two types of rotor used in alternator?

There are mainly two types of rotors used in construction of alternator:

• Salient pole type.
• Cylindrical rotor type.

What is the difference between salient pole and non salient pole rotors?

In contrast to the salient pole rotor, there is the non-salient pole (cylindrical) rotor which is another type of rotor field. A non-salient pole (cylindrical) rotor is for 2- or 4-pole machinery. Such a design offers a higher mechanical force and allows a more precise dynamic balance.

What is the difference between solid rotor and cylinder rotor?

A solid rotor is distributed over the edge of the rotor in the rotor with cylindrical poles. However, each slot has different turns, so that sinusoidal flux is created when excited. Though projections from a solid cylinder rotor with the winding are located in the salient pole. Cylindrical pole spins at 3600 or 1800 with 2 or 4 poles.

How many Poles do you have on your rotors?

Cylindrical or turbo rotors normally two and Very seldom four poles, never more than that. Salient pole rotors have four or more poles.

What is the difference between turbo generator and salient pole generator?

It shall also be noted that Salient Pole machines cannot be used at higher speed because at higher speed the centrifugal forces will be large which may damage the Salient pole bolted on the Rotor core. This is why Turbo Generators uses Cylindrical Pole construction whereas Hydro generators use Salient Pole construction.