Double-Layer Three-Phase Balanced Winding — Lesson 1

This lesson covers the concept of double-layer three-phase balanced winding, a fundamental aspect of AC machines. The lesson explains how the windings are laid in three-phase machines and the importance of understanding these basics. It discusses the specifications of the total number of slots, number of poles, and the electrical angle between two consecutive slots. The lesson also explains the concept of short-corded coils and how to create a winding which is short pitched by one slot. It further delves into the 60-degree phase spread winding and the 120-degree phase spread winding, explaining how the windings are distributed in each case. The lesson concludes with a discussion on the distribution factor and how it varies depending on the phase spread winding.

Video Highlights

00:18 - Introduction to double-layer three-phase balanced winding
01:48 - Discussion on 60-degree phase spread winding
09:23 - Explanation of 120-degree phase spread winding
24:58 - Discussion on distribution factor

Key Takeaways

- The total number of slots, number of poles, and the electrical angle between two consecutive slots are key specifications in winding.
- Short-corded coils and short pitched windings can be created by reducing the coil span by one slot or 30 degrees.
- The 60-degree phase spread winding and the 120-degree phase spread winding distribute the windings differently, affecting the distribution factor.
- The distribution factor is less in a 120-degree phase spread winding compared to a 60-degree phase spread winding.