Question

Fractional pitch winding is used in DC machines to:

• A. Increase eddy current
• B. Decrease the generated voltage
• C. Increase distorting harmonics
• D. Reduce sparking and save copper

Hint:

Fractional pitch = shorter coils → less copper + reduced harmonics = better performance and durability.

Answer 1

The Correct Option is D

Fractional pitch windings use coil spans smaller than the pole pitch. This:
- Reduces end-winding length (saving copper),
- Decreases harmonics,
- Minimizes commutation issues (reduces sparking).