A winding is called integer-slot winding when the number of slots per pole per phase is an integer.
Red cells in the Emetor winding calculator indicate integer slot windings.
For example, a 2-pole 12-slot winding is an integer slot winding, since the number of slots per pole per phase becomes 2 in a three-phase system. Integer slot windings are either single-layer windings when they are full-pitched, or two-layer windings when the coil span is reduced compared to full pitch, see below:
Fig. 1 Single-layer 2-pole 12-slot integer slot winding with full pitch (6 slots) and a winding factor of 0.966.
Fig. 2 Double-layer 2-pole 12-slot integer slot winding with a reduced coil span compared to full pitch with one slot pitch and a winding factor of 0.933.
Fig. 3 Double-layer 2-pole 12-slot integer slot winding with a reduced coil span compared to full pitch with two slot pitches and a winding factor of 0.837.
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