This lesson covers the intricate details of the windings in rotating electrical machines, specifically AC machines. It explains the concept of slots and their spacing, the angle between consecutive slots, and the naming of coil sides based on slot numbers. The lesson further delves into the difference between single layer and double layer windings, explaining how each slot can accommodate one or two coil sides respectively. It also discusses the concept of full pitch coils and the utilization of slots for better efficiency. The lesson concludes with a detailed explanation of three-phase double layer winding, its calculation, and distribution.

- The windings in rotating electrical machines are crucial for their functioning.
- The slots in these machines are equi-spaced, and the angle between consecutive slots can be calculated.
- In single layer windings, each slot accommodates a single coil side, while in double layer windings, each slot can accommodate two coil sides.
- Full pitch coils are used for better efficiency and utilization of slots.
- In a three-phase double layer winding, the total number of coils is equal to the total number of slots. Each phase must have an equal number of coils for a balanced three-phase winding.

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