In the case of single-layer winding, the reference tooth of two adjacent tooth coils is not winded.
2.
Most concentrated windings are executed as double-layer windings, i . e . each tooth entails a concentrated winding and two coil phases in each slot.
3.
This property of self-healing allows the use of a single-layer winding of metallized films without any additional protection against defects, and thereby leads to a reduction in the amount of the physical space required to achieve a given performance specification.