Winding Table for 3-phase Distributed Winding with Examples (Contd.) — Lesson 7

This lesson covers the concept of balanced 3 phase winding in electrical machines. It explains how to create a balanced 3 phase winding when the total number of slots is 24 and the number of poles is 4. The lesson further discusses the distribution of slots to R, Y, and B phases, and the concept of coil sides and coils. It also explains the concept of a double layer winding and the importance of using it. The lesson concludes with a discussion on short pitched coil and how to calculate the distribution factor for a particular machine. For instance, the lesson uses an example of a machine with 24 slots and 4 poles to illustrate these concepts.

Video Highlights

00:24 - Introduction to balanced 3 phase winding
00:55 - Distribution of slots to R, Y, and B phases
02:11 - Discussion on the R phase
11:02 - Discussion on the Y phase
23:50 - Discussion on double layer winding

Key Takeaways

- A balanced 3 phase winding is created by distributing slots to R, Y, and B phases.
- Each slot houses 2 coil sides and two coil sides make a coil.
- Double layer winding is preferred as it utilizes the slots with more conductors, maximizing the use of copper and iron in the machine.
- Short pitched coil is used when the B distribution may contain some harmonics.
- The coil span for a short pitched coil is less than that of a full pitched coil.