Question
Download Solution PDFWhy are salient pole rotors NOT used in turbo alternators?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 1.
Salient pole rotors are not used in turbo alternators because they are not robust enough to withstand the high centrifugal forces and winding losses generated at the high speeds of turbo alternators. Instead, cylindrical rotors, which are more robust and have lower inertia, are used in turbo alternators.
Difference between a salient pole and a cylindrical rotor
|
Salient pole rotor |
Cylindrical rotor |
|
|
|
|
1. Poles are projecting out from the surface |
1. The unslotted portion of the cylinder acts as the pole. Hence, poles are not projecting |
|
2. The air gap is not uniform |
2. The air gap is uniform |
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3. The diameter is high, and the axial length is small |
3. Small diameter and large axial length is the features. |
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4. mechanically weak |
4. mechanically robust |
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5. Preferred for low-speed alternators |
5. Preferred for high-speed alternators i.e. for turbo-alternators |
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6. Prime movers used are water turbines and IC engines. |
6. Prime movers used are steam turbines, electric motors |
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7. For the same size, the rating is smaller compared to the Cylindrical type. |
7. For the same size, the rating is higher than the salient pole type. |
Last updated on Jun 7, 2025
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