In case of high speed universal motor which of the following needs more attention?
Correct answer: D. Balancing of rotor
- A. End play
- B. Air gap
- C. Insulation in rotor
- D. Balancing of rotor
Explanation
A universal motor runs at very high speed, so even slight rotor unbalance produces substantial centrifugal vibration and stress. Careful rotor balancing is therefore especially important.
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