Q7Electrical Machines II
Question
2 marks
What type of winding is an important factor in rotating machines?
Answer
Distributed and short-pitched windings are important for reducing spatial harmonics.
In AC rotating machines, a Distributed and Short-Pitched (Chorded) winding is highly important.
Instead of being concentrated, the winding is spread across multiple slots, and the coil span is intentionally made slightly less than a full pole pitch. This specific winding type is crucial because it significantly suppresses harmonic EMFs and MMFs, yielding a smooth, sinusoidal voltage waveform and reducing parasitic torques and heating.