Which of the following statements is NOT true about an alternator with a cylindrical rotor?

There is no need for damper winding.
It is not suitable for high-speed operation.
The rotor has no projecting pole.
The rotor causes no speed fluctuation

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 2 : It is not suitable for high-speed operation.

Salient pole rotor:

A salient pole rotor has a large diameter and short axial length, length to diameter is ratio is very small.
The salient pole rotor contain projected poles and the field winding is a concentrated winding on the pole core.
The rotors are not mechanically stable and does not offer high operating speeds because of the projected nature.
Any mechanical instability of the rotor i.e. vibration or hunting should be suppressed. This is achieved by providing damper bars in the poles/rotors.

So that salient pole rotor type:- causes speed fluctuation and suitable for- low and medium-speed operation.

Salient pole rotor	Cylindrical rotor
Large diameter and short axial length	Small diameter and long axial length
Used for low-speed alternators	Used for high-speed turbo alternators
Has no projecting poles	Has no projecting poles
Needs damper windings	Do not need damper windings
Windage loss is more	Windage loss is less

4 views Answered 2022-09-04 04:29

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