Why are short-pitch windings preferred in alternators despite their lower induced EMF per coil?

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  1. They eliminate the need for insulation.
  2. They increase the length of end connections.
  3. They allow for higher voltage ratings.
  4. They increase the overall efficiency.

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Option 4 : They increase the overall efficiency.
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Short-pitch windings help reduce harmonic content in the generated EMF, which results in a more sinusoidal output. They also reduce copper loss due to shorter end connections and improve efficiency. Furthermore, they reduce the amount of insulation required due to a lower voltage between adjacent coils and improve the thermal performance of the alternator.

While they slightly reduce the EMF, the overall performance benefits such as better waveform and reduced copper losses lead to increased overall efficiency.

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