What Is Salient Pole And Non Salient Pole

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What is salient and non salient pole?

Their construction is robust as compared to salient pole rotors. Number of poles is usually 2 or 4. Damper windings are not needed in non-salient pole rotors. Flux distribution is sinusoidal and hence gives better emf waveform. Non-salient pole rotors are used in nuclear, gas and thermal power plants.

What does salient pole mean?

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. Less windage loss.

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.

What is meant by salient pole?

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

What is salient and non salient?

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 )

Why is salient pole low speed?

As the water-turbine speed is slow, more pole speeds are needed to achieve the frequency. So, the typical number of pole machines in a salient rotor is between 4 and 60. Regarding the cost, a salient pole rotor is cheaper for speeds below 1000rpm, which is in contrast with a non-salient (cylindrical) rotor machine.

What is difference between salient pole and non salient pole?

The third difference between salient pole and cylindrical pole is that the cylindrical pole (non-salient) design is much more durable and has a much lower winding loss than a salient pole unit. Next, its diameter is smaller but the axial length is longer. Also, both winding and noise are less than salient polar rotors.

What is salient pole in motor?

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 do you mean by the 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.

What is 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 type?

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.

What is the difference between salient and non-salient?

The third difference between salient pole and cylindrical pole is that the cylindrical pole (non-salient) design is much more durable and has a much lower winding loss than a salient pole unit. Next, its diameter is smaller but the axial length is longer. Also, both winding and noise are less than salient polar rotors.

What are the advantages of salient pole alternator?

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.

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.

What is the difference between salient and non-salient pole in an alternator?

Non-Salient pole Synchronous 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. Less windage loss.

Why are salient poles used in low 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.

Why are salient pole machines more stable?

Explanation: Salient pole machines are more stable than cylindrical rotor machines because of the high short circuit ratio and more real power transfer capability. The air gap length in salient pole machines is more as compare to cylindrical rotor machines.

What is the difference between salient and non salient pole?

The third difference between salient pole and cylindrical pole is that the cylindrical pole (non-salient) design is much more durable and has a much lower winding loss than a salient pole unit. Next, its diameter is smaller but the axial length is longer. Also, both winding and noise are less than salient polar rotors.

What are the feature of the salient pole and non salient pole rotor?

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. Less windage loss.

What is non salient pole machine?

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 )

Why do we use salient poles?

Salient Poles are laminated in order to reduce eddy currents. 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 do you mean by salient pole?

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

What is salient pole and non-salient pole rotor?

Their construction is robust as compared to salient pole rotors. Number of poles is usually 2 or 4. Damper windings are not needed in non-salient pole rotors. Flux distribution is sinusoidal and hence gives better emf waveform. Non-salient pole rotors are used in nuclear, gas and thermal power plants.

Where are salient pole rotors preferred?

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.

Where is non salient pole used?

Non- salient rotors are used in high speed alternators having a speed (1500-3000 rpm.) Since non-salient pole rotor are used in high speed alternators, hence small numbers of poles are required to get the fixed frequency ( f=Ns*p/120). Non salient pole rotor has normally two to four number of poles.

What are the advantages of salient pole type construction?

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.

Why are salient pole alternators more suitable for low 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.

Why are salient pole alternator is more suitable for low speed operation?

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 difference between the salient and non salient pole rotors?

The third difference between salient pole and cylindrical pole is that the cylindrical pole (non-salient) design is much more durable and has a much lower winding loss than a salient pole unit. Next, its diameter is smaller but the axial length is longer. Also, both winding and noise are less than salient polar rotors.

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.

Where are salient pole rotors used?

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.

Where and why synchronous generators of salient or non-salient pole type construction are preferred?

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. Less windage loss.

Which type of rotor is preferable for low speed alternators?

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.

Where are salient pole machines 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.

Why salient pole is not used in 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.

What is non-salient pole?

The non-salient pole type structure has the following special features, They are of small diameter and of very long axial length to reduce the peripheral velocity. This type of construction offers fewer windage losses. High speeds are obtained i.e., 1500 to 3000 rpm. Better in dynamic balancing and quiter in operation.

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.

What is the disadvantage in salient pole type rotor?

Causes excessive windage losses. Flux distribution is not uniform due to the presence of salient poles, hence emf waveform generated is not good compared to cylindrical machine.

What are the advantages of circular poles?

A circular timber is 18 per cent stronger in bending resistance than a rectangular timber of similar grade. A round timber, in practically all cases, possesses a very high proportion of the basic strength of its species.

What is salient pole construction?

Construction of a salient pole rotor is as shown in the figure at left. The projected poles are made up from laminations of steel. The rotor winding is provided on these poles and it is supported by pole shoes. Salient pole rotors have large diameter and shorter axial length.

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