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sailant
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How many poles as salient pole rotor?
'Salient' means 'sticking out', so if the pole sticks up from the rotor shaft, then it is a salient pole machine.
What is the difference between salient pole and non salient pole machines?
Rotors used in Synchronous alternators can be classified into 1)Salient and 2)Non-Salient Pole Rotors. Salient pole rotors are used in application with speeds from 100 to 1500rpm. They are alternative known as "projected pole" type of rotors. The poles mounted on the rotor are made of laminations made of steel. The poles are connected to the rotor shaft by means of dovetail joints. Each pole has a pole shoe around which the winding is wound. The salient pole rotor is generally used in applications where the prime mover is a hydel turbine or a combustion engine which have low or medium speeds. Salient pole rotors usually contain damper windings to prevent rotor oscillations during operation. Non-salient pole rotors are generally used in application which operate at higher speeds, 1500rpm and above. The prime movers in these applications are generally gas or steam turbines. These are sometimes known as "drum rotors". The rotor is a cylinder made of solid forged steel. The slots on which the windings are fixed are milled on the rotor. The number of poles is usually 2 or 4 in number. Since these rotors are cylindrical, the windage loss is reduced. The noise produced is also less. These rotors have higher axial length. These rotors do not need damper windings.
Why the synchronous motor is always a salient pole machine ie why don't we use a cylindrical pole machine as a synchronous motor?
The speed of the machine is tied to the power supply frequency and the number of poles the machine has. It becomes impractical to make a round rotor machine with many poles, so machines that spin at low revolutions will typically be salient designs. A two or four pole machine could be round rotor designs.
Why is used just 2 or 4 poles in non salient pole rotor?
to force the generation machines ( generator in power plant) to work on constant speed which mean constant frequency for any power network n= 120 F / p
What is the difference between squirrel cage and slip ring induction motor?
the difference is that squirl cage the rotor is short circuited while it is on operation and out of operation while the rotor of the bother one is connected to nexternal circuit to reduce the starting intial current
What is meant by salient and non-salient pole machine?
for salient type motor Lq>Ld, and non-salient type motor Lq=Ld; Lq and Ld are q-d axis inductanceAnswer'Salient' means to 'stick out', so a 'salient pole' machine is one whose rotor windings are fitted to pole pieces that stick out from the rotor shaft. A 'non-salient pole' machine is one in which the windings are placed in slots machined along the length of the rotor.Salient pole machines run slower and have more poles than slotted-rotor machines, and are typically used in alternators run by water turbines; slotted-rotor machines are typically used in alternators run by high-speed steam/gas turbines.
How many poles as salient pole rotor?
'Salient' means 'sticking out', so if the pole sticks up from the rotor shaft, then it is a salient pole machine.
What are the Types of alternators based on rotor construction?
Types of rotor-Salient pole or projected typeNon salient pole or cylindrical typeSalient type is used for low speed or medium speed motor where non salient type is used for high speed rotor.
What is cylindrical rotor machine?
ok actually i am looking for the answer also but this is what i have got so far,you can understand cylindrical rotor in comparison to Salient pole machines. In cylindrical rotor, as it rotates, the air gap between the rotor and stator doesnt change due to its cylindrical shape, but for salient pole machine, due to its shap, the air gap changes as it rotates, due to those dents(laminations) and since air gap is fixed for cylindrical rotor,the magnetic path reluctance is independent in respect to its position to magnetic poles
Why salient pole machine have higher air turbulence?
The term used is 'windage', rather than 'air turbulence', but the reason is in the name: 'salient' means to 'stick out' -salient poles extent from the rotor, offering greater 'drag', if you like. This is not as critical as it may sound, because salient pole machines are normally driven by water turbines, which rotate at much lower speeds than alternators driven by steam turbines.
What is the priniciple of salient pole alternator?
The term, 'salient', simply means to 'stick out'. So a salient pole machine has field poles that stick out from the rotor. The principle of operation is the same as for any other generator.
What is the difference between salient pole and non salient pole machines?
Rotors used in Synchronous alternators can be classified into 1)Salient and 2)Non-Salient Pole Rotors. Salient pole rotors are used in application with speeds from 100 to 1500rpm. They are alternative known as "projected pole" type of rotors. The poles mounted on the rotor are made of laminations made of steel. The poles are connected to the rotor shaft by means of dovetail joints. Each pole has a pole shoe around which the winding is wound. The salient pole rotor is generally used in applications where the prime mover is a hydel turbine or a combustion engine which have low or medium speeds. Salient pole rotors usually contain damper windings to prevent rotor oscillations during operation. Non-salient pole rotors are generally used in application which operate at higher speeds, 1500rpm and above. The prime movers in these applications are generally gas or steam turbines. These are sometimes known as "drum rotors". The rotor is a cylinder made of solid forged steel. The slots on which the windings are fixed are milled on the rotor. The number of poles is usually 2 or 4 in number. Since these rotors are cylindrical, the windage loss is reduced. The noise produced is also less. These rotors have higher axial length. These rotors do not need damper windings.
Why the synchronous motor is always a salient pole machine ie why don't we use a cylindrical pole machine as a synchronous motor?
The speed of the machine is tied to the power supply frequency and the number of poles the machine has. It becomes impractical to make a round rotor machine with many poles, so machines that spin at low revolutions will typically be salient designs. A two or four pole machine could be round rotor designs.
What is the salient pole type field structure andnon silent pole type field structure in an alternator?
There are two types of rotors - salient pole and round rotor. Salient pole rotors have protuding poles that the coils are wrapped around, and are typically used when many poles are needed. The main electomagnetic difference is a salient pole machine naturally has a varying air gap between the rotor and the stator, due to the pole saliency.
How induction motor is made self starting?
just put a auxilari winding on the rotor (in the salient pole)..
Why is used just 2 or 4 poles in non salient pole rotor?
to force the generation machines ( generator in power plant) to work on constant speed which mean constant frequency for any power network n= 120 F / p
What is salient and non salient pole alternator?
In salient pole alternator Xar is unequal in D-axis and Q-axis, due to non uniform air gap where as in non-salient pole Xar is equal in every axis due to uniform airgap between stator and rotor. Xar is armature reaction reactance.
