What is a typical application of salient pole rotors?

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.

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.

What is the difference between salient pole and non-salient pole rotor?

Based on the construction the rotor of an electrical machine is classified into two types. They are, Salient pole type or projected pole type rotor ( low speed, more number of poles, kaplan turbines ) Non-salient type or smooth cylindrical type rotor ( high speed, 2 or 4 poles, pelton wheel )

What are the advantages of salient pole type of 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.

What are the applications of synchronous motor?

Synchronous motors are normally used in applications in which a constant and precise speed is required. Typical applications of these low power motors are positioning machines. They are also used in robot actuators. Synchronous motors are also used in ball mills, watches, record players, and turntables.

Why salient pole rotor is laminated?

Lamination is done in any machine to reduce the effect of eddy current loss. Eddy Current can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC source only(Not DC ). Since Rotor of the cylindrical synchronous machine is excited by DC supply,so the rotor flux is DC.

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.

What are the advantages of salient pole rotor?

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.

What is salient pole synchronous machine?

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 are the main application of the synchronous?

What is common application of induction motor?

AC induction motors are the most common electric motors in the world. These simple, reliable and economical motors are found in refrigerators, washing machines and furnaces, as well as conveyors, pumps, winders, wind tunnels and other industrial equipment.

What is salient pole rotor?

On the extreme outermost periphery, copper bars are inserted and the rings forming damper winding is cut on both sides. A salient pole rotor is usually found in large (many MW), low-speed, including hydrogen generators or higher-speed machines, up to 1-2 MW.

What is the difference between salient and non-salient pole synchronous generators?

Salient pole synchronous generators are mostly used in hydro power plants. Non-salient pole rotors are cylindrical in shape having parallel slots on it to place rotor windings. It is made up of solid steel. The construction of non-salient pole rotor ( cylindrical rotor) is as shown in figure above.

What is the number of salient poles in an electric motor?

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. (Ns = 120f / P therefore, f = Ns*p/120 i.e. frequency is proportional to number of poles). Typically number of salient poles is between 4 to 60.

How do you calculate frequency from the number of salient poles?

(Ns = 120f / P therefore, f = Ns*p/120 i.e. frequency is proportional to number of poles). Typically number of salient poles is between 4 to 60.