Question
Download Solution PDFWhat type of rotor is used in alternators driven by hydro-turbines?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFA salient pole-type rotor is used in alternators driven by hydro-turbines.
Salient pole machines are suitable to run at low speed. Hence salient pole generators are used in hydropower plants.
Difference between salient pole and cylindrical rotor
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Salient pole rotor |
Cylindrical rotor |
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1. Poles are projecting out from the surface |
1. The unslotted portion of the cylinder acts as poles. Hence, poles are not projecting |
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2. The air gap is not uniform |
2. The air gap is uniform |
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3. Diameter is high and axial length is small |
3. small diameter and large axial length is the feature |
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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 mover 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. |
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