Understanding Eddy Current Loss in Transformers — Lesson 4

This lesson covers the concept of Eddy current loss in transformers. It begins with a discussion on the modeling of practical transformers, highlighting the role of magnetizing current, resistance, and leakage flux. The lesson then delves into the equivalent circuit of a practical transformer, explaining how it can be modeled as an ideal transformer with external parameters. The lesson further explores the concept of Eddy current loss, explaining why it occurs and how it can be reduced. It explains that Eddy current loss occurs due to time-varying flux in the transformer core, and can be reduced by using thin, insulated plates instead of solid iron. The lesson concludes with the goal of finding an approximate expression for Eddy current loss.

Video Highlights

01:18 - Introduction to the concept of finite magnetizing current in a practical transformer
06:32 - Explanation of the concept of core loss in a practical transformer
07:12 - Discussion on the concept of hysteresis loss
27:30 - Explanation of how to reduce Eddy current loss
36:26 - Conclusion of the lecture and introduction to the next class topic

Key Takeaways

• Practical transformers can be modeled as ideal transformers with external parameters such as magnetizing current, resistance, and leakage flux.
• Eddy current loss in transformers occurs due to time-varying flux in the transformer core.
• Eddy current loss can be reduced by using thin, insulated plates instead of solid iron in the transformer core.
• The goal is to find an approximate expression for Eddy current loss and understand the factors it depends on.