Which among the following makes double layer windings advantageous than the single layer windings?

Double layer windings have several advantages over single layer windings in electric motors and generators due to their design and construction characteristics. The benefits include:

1. Improved Space Utilization: Double layer windings make better use of the available space in the armature slots. This efficient use of space often translates into a more compact design for the same power output, or allows for higher power output within the same machine size.

2. Higher Fill Factor: With coils in the upper and lower layers of the slots, double layer windings can achieve a higher slot fill factor compared to single layer windings. This means that more copper can be placed in the slots, reducing resistance and improving the efficiency of the motor or generator.

3. Ease of Manufacture: Double layer windings can be easier to manufacture and insert into the slots because they often utilize prefabricated coil groups that are inserted into the slots. This can lead to less manufacturing time and potentially lower production costs.

4. Lower Harmonics: Double layer windings can be designed to reduce the harmonic content in the generated EMF (Electromotive Force). This is particularly advantageous in applications where power quality is a concern, as it can lead to smoother operation and less electrical noise.

5. Flexibility in Design: They offer greater flexibility in terms of winding configurations, allowing for more customized solutions to meet specific application requirements. This could include different pole counts, winding factors, and the capability to more easily achieve certain performance characteristics