In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?
Correct answer: D. reduce magnetic hum
- A. reduce windage losses
- B. reduce eddy currents
- C. reduce accumulation of dirt and dust
- D. reduce magnetic hum
Explanation
Slightly skewed rotor slots reduce slot harmonics and the resulting magnetic pulsations, which minimises magnetic hum. Skewing also helps reduce cogging and torque pulsations, but reducing hum is the intended option here.
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