# Integer-slot winding

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:

 A A c c B B a a C C b b

Fig. 1 Single-layer 2-pole 12-slot integer slot winding with full pitch (6 slots) and a winding factor of 0.966.

 A A c c B B a a C C b b b A A c c B B a a C C b

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.

 A A c c B B a a C C b b b b A A c c B B a a C C

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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