What are the advantages of salient pole rotor?
Table of Contents
- 1 What are the advantages of salient pole rotor?
- 2 What is salient pole alternator?
- 3 What is the meaning of salient poles?
- 4 What are the advantages of providing damper winding?
- 5 What are the feature of the salient pole and non-salient pole rotor?
- 6 In which alternator better balance and quieter operation is possible?
- 7 What type of rotors does an engine alternator usually have?
- 8 Which type of rotor is best for a turbo alternator?
- 9 What are the advantages and disadvantages of salient pole rotors?
- 10 What is the difference between salient pole and cylindrical pole?
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 alternator?
Salient Pole Synchronous Alternator: 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. Salient Pole Synchronous Generators are employed in Hydro-Power plants.
Why is salient pole alternator not suitable for 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 the meaning of salient poles?
Definition of salient pole : a magnet pole that projects toward the armature of an electric machine — compare consequent pole.
What are the advantages of providing damper winding?
Damper windings helps the synchronous motor to start on its own (self starting machine) by providing starting torque. By providing damper windings in the rotor of synchronous motor “Hunting of machine”can be suppressed.
What is salient motor?
In salient pole type of rotor consist of large number of projected poles (salient poles) mounted on a magnetic wheel. 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.
What are the feature of the salient pole and non-salient pole rotor?
Difference Between Salient Pole & Non-Salient Pole Rotor
| S.no. | Salient Pole Type Rotor | Non-salient Type Rotor |
|---|---|---|
| 8. | Perfectly not balanced. | Perfectly balanced. |
| 9. | Air gap is present in between poles. | No air-gap in between poles. |
| 10. | Flux is not uniform due to interpolar gap. | Flus is uniformly distributed. |
In which alternator better balance and quieter operation is possible?
The cylindrical rotor alternators are generally designed for 2-pole type. The cylindrical rotor type machine gives better balance and quieter operation along with lesser windage losses.
What is the difference between salient pole and cylindrical rotor?
non-salient pole rotors are used in nuclear, gas, and thermal power plants. The last difference between salient pole and cylindrical pole is that the rotor of the cylindrical pole can run at a higher rotational speed, provided that the rotor is easily balanceable and the centrifugal force can be equally distributed.
What type of rotors does an engine alternator usually have?
There are two designs for the rotor in an induction motor: squirrel cage and wound. In generators and alternators, the rotor designs are salient pole or cylindrical.
Which type of rotor is best for a turbo alternator?
Smooth cylindrical type rotor is generally used for high speed alternators or turbo alternators.
Which type pole construction is employed for salient pole alternators?
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 are the advantages and disadvantages of salient pole rotors?
The advantage of a salient pole rotor is that you can fit a large number of poles so can generate a given frequency at a low rotational speed. This is only good for slow speed prime movers, such as water turbines. If you try to spin the rotor too fast, it will vibrate and want to fly to pieces.
What is the difference between salient pole and cylindrical 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.
Is it possible to have more than 4 poles on a rotor?
However it becomes impractical at greater than 4 poles. Each pole has its own separate coil and at 6 poles or more, gets messy and runs out of room for rotor windings. A salient pole rotor has pole coils wound on ferromagnetic cores bolted around the circumference of the ferromagnetic rotor.